JB/T 9738-2000 Technical requirements for truck cranes and tire cranes
Some standard content:
JB/T9738—2000
This standard is a revision of JB/T9738.1—1999 Technical Requirements for Truck Cranes and Tire Cranes. In this revision, the clauses of the control system, safety devices, etc. are supplemented, and the individual clauses of the original standard that are not clear and accurate are modified to improve the applicability and operability; the referenced standards are checked. This standard replaces JB/T9738.1—1999 from the date of implementation. Appendix A of this standard is the appendix of the standard.
This standard is proposed and managed by Changsha Construction Machinery Research Institute of the Ministry of Construction. The drafting unit of this standard: Changsha Construction Machinery Research Institute of the Ministry of Construction. The drafter of this standard: Cao Zhongmei.
This standard was first issued in 1979, first revised in January 1987, and the standard number was adjusted to JB/T9738.1-1999 in April 1999. This standard is entrusted to Changsha Construction Machinery Research Institute of the Ministry of Construction for interpretation. 977
1 Scope
Machinery Industry Standard of the People's Republic of China
Truck crane and wheel crane
Technical requirements
Truck crane and wheel crane-Technical requirementsJB/T 9738--2000
Replaces JB/T9738-1999
This standard specifies the basic requirements for the design, manufacture, use and safety of truck cranes and wheel cranes. This standard applies to cranes specified in JB/T1375. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1184--1996 Tolerances of form and position Basic tooth profile of involute cylindrical gears without tolerance values
GB/T 1356-1988
GB/T 1357-1987
Module of involute cylindrical gears
GB1495-1979 Permissible noise of motor vehiclesGB1589--1989
Limits of motor vehicle outer dimensions
Basis of limits and fits Part 3: Table of numerical values of standard tolerances and basic deviationsGB/T 1800.3-1998
GB/T 2348--1993
GB/T2349-
GB/T 3766-
GB/T 3811-
GB 6067-1985
Hydraulic and pneumatic systems and components Cylinder inner diameter and piston rod outer diameter Hydraulic and pneumatic systems and components Cylinder piston stroke series General technical conditions for hydraulic systems
Crane design specifications
Safety regulations for lifting machinery
Test specifications and qualification tests for truck cranes and tire cranes
GB/T 6068.2---1985
GB/T 6068. 3--1985
Test specifications for truck cranes and tire cranes GB7258-1997 Technical conditions for motor vehicle operation safety GB/T 79351987
GB/T 8106---1987
General technical conditions for hydraulic components
Test methods for directional control valves
GB/T 10095-—1988
Precision of involute cylindrical gears
GB/T14048.1—1993General rules for low-voltage switchgear and controlgearGB/T 15052
Hazardous parts and markings of lifting machinery
2—1995
GB/T 15622
GB 16710. 1---1996
JB/T 1375—1992
JB/T 2300—1999
JB/T 3301—1983
Test method of hydraulic cylinder
Noise limit of construction machinery
Classification of truck crane and tire crane
Slewing bearing
Truck crane and tire crane
Approved by the State Bureau of Machinery Industry on April 24, 2000 978
Terms and terms
Determination of stability
Implementation on October 1, 2000
JB/T 9738-2000
JB/T4301—1985 Label of truck crane and tire crane JB/T4030.3-2000 Test specification of truck crane and tire crane Hydraulic system test 1. General technical conditions for gray iron castings of construction machinery JB/T 59371991
JB/T 5939--1991
Engineering machinery
General technical conditions for steel castings
JB/T 5943-1991
1General technical conditions for welded parts of engineering machinery
1General technical conditions for heat-treated parts of engineering machineryJB/T 5944—1991
JB/T5945-1991
General technical conditions for assembly of engineering machinery
JB/T 5946--1991
General technical conditions for painting of engineering machinery
JB/T 5995-1992
Regulations for the preparation of instruction manuals for electromechanical products
JB8716-1998Safety regulations for truck cranes and tire cranesJB/T 9737.1--2000
JB/T 9737. 3--2000
JB/T 9739.1--2000
Hydraulic oil solid particle pollution level of truck crane and tire crane
Selection and replacement of hydraulic oil of truck crane and tire craneBalance valve of truck crane and tire craneJB/T9739.2--2000Pulley of truck crane and tire crane3General provisions
3.1Working conditions
3.1.1The parking ground should be solid, and the pressure bearing capacity should not be less than 3.5MPa. The whole machine should be level, and the supporting ground should not sink during operation. 3.1.2The tire working pressure of the tire crane should comply with the air pressure specified by the tire or crane manufacturer, and the error is ±10kPa. All tires should be straightened when the crane is operating. When the truck crane is operating with outriggers, all tires should be off the ground. 3.1.3The ambient temperature is -20 to +40C. 3.1.4The wind speed does not exceed 13.8m/s.
3.2 The manufacturer shall clearly define the scope of the crane's operating area. The operating area of a truck crane shall include the side and rear; the operating area of a tire crane shall generally include the side, rear and front. If the operating position area cannot meet the requirements of IB/T3301, the application diagram 3.3 shall be used for cranes with special requirements, which may be implemented according to the technical agreement between the user and the manufacturer. 4 Complete machine
The basic parameters of the crane shall comply with the provisions of JB/T1375. 4.2
The structural, mechanism and electrical design of the crane shall comply with the provisions of GB/T3811. 4.3
The components and assemblies used in the crane must be products that have passed the installation test. The stability of the crane as a whole shall comply with the provisions of GB/T6068.3. 4.4
The requirements and representation methods of the rated lifting capacity table and lifting height curve sign shall comply with the provisions of JB/T4031. 4.6
The setting and commissioning of crane safety devices shall comply with the requirements of JB8716. The maximum operating speed of the crane's engine and hydraulic pump must be limited according to the design requirements, and its value shall not exceed the rated speed of the hydraulic pump. 4.7
If the speed is limited by the throttle, the throttle pedal must be equipped with an adjustable limiter. 4.8 The average lifting speed and no-load slewing speed of the crane shall not be lower than the design value. 4.9 The deviation value of the horizontal span and longitudinal span of the crane's outriggers from the nominal size shall not be greater than 1%. 4.10 When the crane uses outriggers to operate, when lifting the maximum rated lifting weight of each section of the boom length, it shall be slewed within the corresponding range and any movable outrigger shall not be loose.
4.11 The manufacturer shall clearly specify whether it has the ability to telescope and travel with load. 4.12
Crane with a lifting weight greater than 16t should be equipped with a jib. 4.13
The onboard control room should be located on the left side of the crane. The cab and the control room should be spacious and have a good view. The internal width of the control room should not be less than 700mm. The height should not be less than 1400mm. The front 4.14
JB/T 9738-2000
The windows should be equipped with wipers and sun visors, and the doors and windows should be easy to open and close and securely fixed. The door of the upper control room should be equipped with a locking device when fully opened, and the door should be locked.
The cab and the control room are required to have good sealing, heat preservation, ventilation and heat dissipation and rainproof performance. The floor should be non-slip and the seat should be comfortable and adjustable. 4.15 When the crane is operating, the vertical and horizontal vibration accelerations of the control panel and seat in the control room shall not exceed 0.2g.
4.16 The approach angle of the truck crane shall not be less than 16°, and the departure angle of the truck crane shall not be less than 10°. 4.17 The climbing grade of the crane shall not be less than 20%. 4.18 The outer dimensions of the truck crane in the driving state shall not exceed the values specified in Table 1. The rear overhang of the vehicle shall not exceed 2/3 of the wheelbase. For a three-axle chassis, if the second and third axles are double rear axles, their wheelbases shall be calculated according to the distance from the first axle to the centerline of the double rear axles; if the first and second axles are double steering axles, their wheelbases shall be calculated according to the wheelbases of the first and third axles. The deadweight and axle load shall not exceed 3% of the design value. Table 1
Total mass of truck crane in driving state, t
Vehicle length/m
Vehicle width/m
>26～~60
4.19 The noise during crane operation shall comply with the provisions of GB16710.1, and the noise during crane driving shall comply with the provisions of GB1495. 4.20 When the product leaves the factory, the product instruction manual, product certificate, instruction manual of main purchased parts, random spare parts, spare parts catalog, random tools and packing list shall be provided randomly. The preparation of product instruction manual shall comply with the provisions of JB/T5995. 5 Structure
5.1 The selection of materials shall comply with the provisions of GB/T3811 and the use of high-strength steel. 5.2 Welding parts and bolt connections shall comply with the provisions of GB/T3811 and JB/T5943, JB/T5945. 5.3 Box-type boom
5.3.1 The shape and position tolerances of the cover plate and web plate of the box-type boom shall comply with the provisions of Table 2. Table 2
Box-type boom section height H
Flatness error of cover plate and web plate (within 1m length)Parallelism of upper and lower cover plates and two web plates
Verticality of web plate to lower cover plate at any section5.3.2 The straightness error of the axis of the boom in the horizontal plane shall not exceed 4mm. 400
>400～800
5.3.3 After assembly, the clearance of each box-shaped arm shall not exceed 2.5mm after lateral single-sided adjustment, and there shall be no abnormal phenomenon during telescopic operation. 5.3.4 The verticality error of the axis of the shaft hole at the root of the basic arm to the longitudinal plumb plane of the center line of the boom shall not exceed 1.5/1000. 5.3.5 The parallelism error between the axis of the connecting shaft hole of the hydraulic cylinder of the basic arm and the axis of the root shaft hole shall not exceed 1/1000 (except when the hydraulic cylinder adopts a ball joint connection).
5.4 Truss boom
5.4.1 The diagonal length error of each section of the boom shall not exceed 1.5/1000 of the nominal size. 5.4.2 The straightness error of the chord and web between each section of the boom shall not exceed 2/1000 of the nominal length, and the straightness error of the main chord after welding shall not exceed 3mm over the entire length.
5.4.3 The truss boom assembled from multiple sections should ensure that the middle boom sections are interchangeable. 5.4.4 In a given plane, the straightness of the center line of each boom section shall not exceed 1/1000 of the measured length, and the total length shall not exceed 4mm. The torsional deformation measured at both ends after welding shall not exceed 4 mm. 5.4.5 The verticality error of the axis of the shaft hole at the root of the boom to the vertical plane of the longitudinal center of the boom shall not exceed 1.5/1000.980bzxz.net
5.5 Turntable
JB/T9738—2000
5.5.1 After the turntable is welded, the flatness error of the non-machined surface shall not exceed 5mm. 5.5.2 The flatness of the joint surface between the turntable and the slewing bearing shall comply with Grade 11 in GB/T11841996, and its surface roughness Ra shall not exceed 12.5μm.
5.5.3 The parallelism error between the axis of the connecting shaft hole of the variable-length hydraulic cylinder and the boom and the turntable and the plane of the slewing bearing shall not exceed 1.5/1000, and the perpendicularity error with the longitudinal center line of the turntable shall not exceed 1.5/1000.5.5.4 In the plane formed by the axis of the variable-length hydraulic cylinder support and the axis of the boom support, the symmetry error of the center line or symmetry center line of the variable-length hydraulic cylinder support relative to the symmetry center line of the boom support shall not exceed 2mm. 5.6 Underframe
5.6.1 The diagonal length tolerance of the underframe between the front and rear legs is 1/1000 of the distance between the front and rear legs, and the flatness error of the entire length shall not exceed 5mm.
5.6.2 The flatness of the plane on the underframe and the surface of the slewing bearing shall comply with Grade 11 in GB/T1184--1996, and its surface roughness Ra shall not exceed 12.5μum.
5.7 Outriggers
5.7.1 The verticality error of the axis of the fixed outrigger and the axis of the movable outrigger of the frog-type outrigger to the longitudinal axis of the outrigger shall not exceed 1.5/1000.5.7.2 The surface roughness Ra of the working surface of the slideways on both sides of the movable outrigger of the frog-type outrigger shall not exceed 6.3um. In the same section, the position error of the two slideways shall not exceed 0.1mm, and the parallelism error with the axis of the hinged axis shall not exceed 1/1000.5.7.3 The single-sided gap between the movable outrigger and the fixed outrigger of the H-type and X-type outriggers shall not exceed 3mm, and the gap in the vertical plane shall not exceed 5mm.
5.7.4 The parallelism and flatness errors of the upper and lower covers of the movable and fixed outriggers shall not exceed 2rmm in the whole length range, and the verticality error of the side plate to the lower cover plate in any section shall not exceed 2mm. 5.8 The surface of the structural parts such as the crane arm, control room, and shed shall be flat and free of obvious hammer marks. 6 Mechanisms and Components
6.1 The wire rope should not be tangled on the drum, and the lifting wire rope should be prevented from twisting. 6.2 The pulley should comply with the provisions of JB/T9739.2. 6.3 Brakes
6.3.1 The lifting mechanism and luffing machinery must be equipped with a normally closed brake. 6.3.2 The installation of the brake should comply with the provisions of JB/T5945. The radial circular runout of the wheel surface to the inner hole axis should comply with the provisions of the 9th grade accuracy in GB/T1184-1996, and the end face circular runout should comply with the provisions of the 10th grade accuracy in GB/T1184-1996. 6.3.3 Dry brakes should have measures to prevent oil pollution. 6.4 Reducer
6.4.1 The assembly accuracy, running-in and installation clearance of the reducer should comply with the provisions of JB/T5945. 6.4.2 Worm gear and worm reducer should be loaded and run-in according to the design requirements. 6.4.3 The heat treatment of main parts shall comply with the provisions of JB/T5944. 6.5 Gear
6.5.1 The module of involute cylindrical gear shall comply with the provisions of GB/T1357, the reference tooth shape of involute cylindrical gear shall comply with the provisions of GB/T1356, the load capacity calculation of involute cylindrical gear shall comply with the provisions of GB/T3811, and the precision of involute cylindrical gear shall comply with the provisions of GB/T10095. 6.5.2 Involute cylindrical gears and round cylindrical gears used for open transmission generally need to be quenched and tempered, and their hardness shall not be less than 225HB. For surface treatment, the hardness shall not be less than 40HRC, and the quenching depth shall comply with the provisions of JB/T5944. 6.5.3 For carburized gears used in closed transmission, the carburized layer depth, gear hardness and metal structure shall comply with the provisions of JB/T5944. 6.5.4 The surface of the sealing journal shall be subjected to surface quenching treatment, and its surface hardness shall not be less than 40HRC, and the surface roughness Ra shall not be greater than 0.8μm.
6.6 Housing
JB/T9738—2000
6.6.1 The casting of the housing shall comply with the provisions of JB/T5937 and JB/T5939. 6.6.2 The dimensional accuracy of the bearing hole shall comply with the IT6 grade in GB/T1800.3, the surface roughness Ra shall not be greater than 1.6μm, the roundness or cylindricity shall not be less than the 7 grade in GB/T1184, and the perpendicularity of the bearing hole axis to the reference end face shall comply with the 6 grade accuracy requirements in GB/T1184. 6.6.3 The gap between the upper and lower box joint surfaces shall be checked with a 0.05mm feeler gauge for boxes with a length less than 800mm, and with a 0.08mm feeler gauge for boxes with a length equal to or greater than 800mm. The insertion depth shall not be greater than 1/3 of the joint surface width. 6.7 The starting and braking of the lifting mechanism and the luffing mechanism shall be smooth and the action shall be accurate. 6.8 After the load stops in the air, it shall be lifted and started again. At this time, the load shall not show obvious reverse action under any lifting operation conditions. 6.9 Slewing bearing, slewing mechanism
6.9.1 The slewing bearing shall comply with the provisions of JB/T2300. 6.9.2 The slewing starting and braking shall be smooth and shall have controllable sliding performance in two directions. 6.9.3 A fixed device should be provided to prevent relative rotation of the vehicle when getting on and off the vehicle during driving. 6.10 Telescopic mechanism
6.10.1 The safety factor of the wire rope used for the telescopic mechanism shall not be less than 4. 6.10.2 The ratio of the winding diameter of the pulley used for the telescopic mechanism to the diameter of its wire rope shall be: not less than 16 for extension; not less than 12 for retraction.
6.11 Each outrigger shall be reliably fixed in the specified position. When fixed in the driving position, the extension amount of the hydraulic cylinder of the movable outrigger shall not exceed 3mm after the factory driving test. It is allowed to lock the movable outrigger mechanically. 6.12 Control system
6.12.1 All control handles, pedals and buttons shall be installed in a convenient position for operation. Generally, the right hand is used to operate the lifting and luffing, and the left hand is used to operate the rotation and telescoping. The movement direction of the control handle shall be consistent with the movement direction of the controlled mechanism. 6.12.2 The operating handle should be light and flexible, and the operating actions should not interfere with each other or cause malfunctions. The handles and pedals should not be out of position due to vibration in the middle position.
6.12.3 Among the lifting, luffing, slewing and telescopic mechanisms, at least two mechanisms should be able to work simultaneously. 6.12.4 The operating handles, pedals, buttons, indicators and signal devices should be clearly marked near them, and their uses and operating directions should be explained.
6.12.5 The spacing between the operating handles should not be less than 65mm. The operating force and operating stroke are shown in Table 3. Table 3
Operation mode
Hand operation
Foot operation
Operation position
Main lifting
Auxiliary lifting
Outrigger retraction
Horizontal extension
Vertical extension
Brake pedal
Operation force
≤150
Operation stroke
7 Chassis
JB/T9738—2000
7.1 The design and manufacture of chassis for truck cranes shall generally comply with the provisions of relevant automobile standards. 7.2 The shape shall be beautiful and generous, the structure shall be reasonably arranged, and the installation, maintenance and adjustment shall be easy. 7.3 The crane shall be able to be towed and steered safely when the engine is turned off. 7.4 When the steering system adopts power steering, it shall ensure that the steering capability is still available when the power steering fails, and the crane can steer safely. 7.5 For tire cranes with all-wheel steering, there should be a return indicator device for starting the wheel steering. 7.6 The crane control room should have an engine start and throttle control device. For tire cranes with elastic suspension, there should be a device that can lock the elastic element during lifting operations. 7.7
7.8 Cranes with load-lifting driving performance should have a minimum stable driving speed of no more than 3km/h. 7.9 The operation method and label of the power take-off are explained at the operation place, and there is an indicator light. 7.10 The initial running-in of the chassis shall be carried out in accordance with the provisions of GB/T6068.2. 8 Hydraulic system
The design, manufacture, installation and piping of the hydraulic system shall comply with the relevant provisions of GB/T3766. 8.1
8.2 The set pressure of the overflow valve in the system shall not be greater than 110% of the rated working pressure of the system. 8.3 Before assembly, various hydraulic components must be subjected to sampling bench tests, and they can only be installed if their performance is qualified. 8.4 When lifting the maximum rated lifting weight, the hydraulic pump stably operates at the design speed (flow), and the actual working pressure value of each hydraulic circuit shall not be greater than the rated working pressure of the hydraulic pump.
8.5 When the hydraulic pump is unloaded and at the maximum design speed (flow), the pressure loss value of each hydraulic circuit shall not be greater than 3.0MPa. When the control valve stems are all in the middle position, the pressure loss value shall not be greater than 2.0MPa. 8.6 The working medium in the system shall be hydraulic oil, and mixed oil is not allowed. The selection of hydraulic oil is specified in JB/T9737.3. 8.7 The system contamination degree shall comply with the provisions of JB/T9737.1. 8.8 In actual operation of the crane, the maximum oil temperature in the hydraulic oil tank shall not exceed 80C. 8.9 When the hydraulic pump is at rated speed (flow) when unloaded, the control pressure (pressure at the control port) of the balance valve in each hydraulic circuit is: a) not more than 6.0 MPa in the lifting hydraulic circuit; b) not more than 5.0 MPa in the variable amplitude hydraulic circuit; c) in the telescopic hydraulic circuit, when passing 1/3 of the rated flow, the control pressure is not more than 1.0 MPa8.10 The balance valve and the controlled element must be rigidly connected, and the spacing should be as short as possible. 8.11 When the hydraulic element or pipeline is damaged or the system loses pressure in the system, all mechanisms can stop automatically. 8.12 The vacuum degree of the hydraulic pump inlet shall comply with the provisions of the hydraulic pump technical requirements. The system should work smoothly without abnormal noise. 8.13 The hydraulic system test shall comply with the provisions of JB/T4030.3. 8.14 The test of hydraulic components shall be carried out in accordance with the provisions of GB/T8106 and GB/T15622. 8.15 The technical requirements of hydraulic components are shown in Appendix A (Appendix of the standard). 9 Safety devices and electrical systems
9.1 The crane should be equipped with a lifting height limiter, which should work reliably. 9.2 For cranes that use wire ropes for amplitude change, amplitude limiters and devices to prevent backward tilting should be installed. 9.3 The crane should be equipped with an amplitude change indicator with clear readings. When the amplitude is less than or equal to 5m, the amplitude deviation indicated by the indicator shall not exceed 100mm; when the amplitude is greater than 5m, the amplitude deviation shall not exceed 2%. 9.4 Cranes below 16t should be equipped with a lifting capacity display, the error of which shall not exceed 5%! 9.5 Cranes above 16t and 16t should be equipped with a lifting torque limiter, which should work reliably and be easy to check and calibrate. The system installation comprehensive error of the torque limiter shall not be less than ±5%, and the setting value of the overload alarm point shall ensure that in any case, when the alarm signal occurs, the actual load moment of the crane is not greater than 110% of the rated load moment under the corresponding working condition, and ensure that the maximum rated lifting weight of the crane can be lifted slowly and reliably. Cranes with a rated lifting weight of less than 16t should also be equipped with torque limiters. 9.6 A truss arm crane with a lifting height greater than 50m should be equipped with an anemometer at the arm head, and an alarm should be issued to stop the operation when the wind speed exceeds the working limit wind speed.
9.7 The general wire used for wiring should be a multi-strand copper core wire, and its minimum cross-sectional area should not be less than 1.5mm. When a multi-core soft wire is used, its minimum cross-sectional area should not be less than 1mm (except for the wires used for electronic devices and hydraulic servo mechanism sensors). 9.8 Cranes that can be operated at two locations must be equipped with an interlocking device to prevent simultaneous operation at two locations. 9.9 The installation location of motors, generators and other electrical appliances on the crane should be convenient for wiring, inspection and maintenance, and have good ventilation and heat dissipation conditions.
9.10 Resistance boxes with high heat generation must be stacked in the specified direction and quantity, and ventilation and heat dissipation conditions must be ensured. The installation location should avoid vibration as much as possible.
9.11 The insulation resistance of the crane electrical system should meet the requirements of Table 4 according to the rated voltage level used, and the selection of test instruments should comply with the provisions of GB/T14048.1.
Table 4 Insulation resistance and voltage level
Rated voltage V
Insulation resistance Ma
>60～660
9.12 Between two independent circuits that are not connected in the crane electrical system, and between the live circuit and the metal casing (or ground), the withstand voltage test shown in Table 5 should be carried out. The test time is 1min, and the test results should comply with the provisions of GB/T14048.1. Table 5 Withstand voltage test
Rated circuit voltage V
Test voltage V
>60～125
>125~250
>250～550
9.13 The crane should be equipped with an audio communication signal for operation, which should be distinguished from the overload alarm signal of the torque limiter. 9.14 Vehicle lighting and signals
9.14.1 The lighting and signals provided by the crane should comply with the relevant provisions of GB7258. 9.14.2 The lighting used on the working surface of the control room should not be less than 50lx. 9.15 The electrical part of the instruction manual should provide a detailed main circuit and control circuit schematic or wiring diagram, and a list showing the detailed specifications of the motors and electrical appliances used.
9.16 When the crane is operating near high-voltage transmission lines, it should comply with the provisions of GB6067. 10 Painting
10.1 The appearance, paint, pattern and trademark of the crane should be beautiful and elegant, and the painting should comply with the provisions of JB/T5946. 10.2 The markings of dangerous and protruding parts such as the side plate of the crane hook, the head of the boom, the tail of the turntable, and the movable outriggers shall comply with the provisions of GB/T15052.
A1 Hydraulic cylinder
JB/T9738--2000
Appendix A
(Appendix to the standard)
Technical requirements for hydraulic components
A1.1 The main parameters and dimensions of the hydraulic cylinder shall comply with the provisions of GB/T2348 and GB/T2349. A1.2 The test content and methods shall comply with the provisions of GB/T15622, and the main technical indicators shall refer to the relevant provisions of GB/T15622 or meet the design requirements.
A1.3 After assembly, the piston rod or the sleeve cylinder of the multi-stage cylinder shall be smooth during the extension and retraction process without jamming, and the working surface shall not have defects such as roughness and bumps.
A7.4 Cylinder
A1.4.1 The manufacturing accuracy of the inner diameter of the cylinder is H8. Its roundness shall not be lower than Grade 8 specified in GB/T1184, and the surface roughness Ra shall not be greater than 0.4um.
A1.4.2 For cylinders with shaft holes or trunnions, after welding, the perpendicularity of the axis of the shaft hole or the axis of the trunnion to the axis of the inner diameter of the cylinder shall not be lower than Grade 9 over a length of 100mm.
A1.4.3 When the cylinder head is connected by threads, the coaxiality of the thread to the inner diameter of the cylinder shall not be lower than Grade 8. A1.5 Piston rod
A1.5.1 The outer diameter dimension accuracy shall not be lower than f9, its roundness shall not be lower than Grade 8, and the surface roughness Ra shall not be greater than 0.2um. A1.5.2 The straightness of the outer diameter shall not be lower than Grade 7 when measured over a length of 1m. A1.5.3 The coaxiality of the shaft diameter that matches the piston hole to the piston rod axis shall not be lower than Grade 8. A1.5.4 The verticality of the positioning end face in contact with the piston to the axis of the piston rod outer diameter shall not be less than Grade 8. A1.5.5 The verticality of the pin hole axis to the piston rod axis shall not be less than Grade 7 over a length of 100mm. A1.6 Piston
A1.6.1 The dimensional accuracy of the piston outer diameter shall not be less than f8, its roundness shall not be less than Grade 8, its surface roughness Ra shall not be greater than 1.6um, and its coaxiality with the inner hole axis shall not be less than Grade 8.
A1.6.2 The dimensional accuracy of the piston inner hole shall not be less than H8, its roundness shall not be less than Grade 8, and its surface roughness Ra shall not be greater than 1.6m. A1.6.3 The circular runout of the piston support end face to the inner hole axis shall not be less than Grade 7 over a diameter of 100mm. A2 Hydraulic valve
A2.1 The outer diameter dimensions of the valve core and valve stem shall comply with the provisions of GB/T2348. A2.2 The verticality of the axis of the inlet and outlet connection screw holes sealed by the sealing ring on the valve body to the sealing plane shall not be less than 10 levels. A2.3 Multi-way reversing valve
A2.3.1 After assembly, the valve stem should move flexibly without blocking, and the working surface of the valve stem is not allowed to have defects such as bruises and roughness. A2.3.2 The test content and method shall be in accordance with the provisions of GB/T8106, and its main technical indicators shall comply with the relevant provisions of GB/T7935. A2.3.3 Valve body
a) The valve hole surface is not allowed to have defects such as cracks, pores, looseness, inclusions, etc.; b) The valve hole size accuracy is not less than H8, its cylindricality is not less than 7 levels, and the surface roughness Ra is not greater than 0.4um; c) The axial position of the valve hole distribution ring groove is 0.4 mm. A2.3.4 Valve stem
a) The outer diameter of the valve stem shall not be less than f8, its cylindricality shall not be less than grade 7, the surface roughness Ra shall not be greater than 0.4μm, and the hardness shall be 45~52HRC;
JB/T9738-2000
b) The clearance between the outer diameter of the valve stem and the aperture of the valve body shall be 0.007~~0.015mmzc) The axial position error of the valve stem distribution ring groove shall not be greater than 0.2mm; d) The working surface of the valve stem is not allowed to have defects such as bruises and roughening. A2.4 Balancing valve
A2.4.1 The content and methods of the dynamic and static performance test of the balancing valve shall comply with the requirements of JB/T9739.1. A2.4.2 The forward pressure loss at the rated flow shall not exceed 0.5MPa. A2.4.3 There shall be no internal leakage when the pressure is maintained for 5min at the rated pressure (except for the sliding valve type). A2.4.4 Valve body
a) The dimensional accuracy of the one-way valve aperture shall not be lower than H8, and the surface roughness Ra shall not be greater than 1.6μm; b) The coaxiality of the one-way valve hole and the one-way valve cone seat hole shall not be lower than Grade 5; c) The dimensional accuracy of the valve sleeve installation aperture shall not be lower than H8, its roundness shall not be lower than Grade 8, and the surface roughness Ra shall not be greater than 1.6umA2.4.5 Valve sleeve
a) The dimensional accuracy of the valve sleeve inner hole shall not be lower than H8, its roundness shall not be lower than Grade 6, and the surface roughness Ra shall not be greater than 0.4um; b) The coaxiality of the inner cone surface that serves as a seal and the axis of the guide hole shall not be lower than Grade 5, and the surface roughness Ra shall not be greater than 1.6μm. A2.4.6 Valve core
a) The outer diameter dimension accuracy of the valve core shall not be less than f8, its cylindricality shall not be less than grade 6, the surface roughness Ra shall not be greater than 0.4um, and the hardness shall not be less than 45-~52HRC;
b) The verticality of the end face that plays a positioning and sealing role to the outer diameter axis shall not be less than grade 6, and the surface roughness Ra shall not be greater than 0.8μm. A2.4.7 One-way valve core
a) The outer diameter dimension accuracy of the valve core shall not be less than f8, its cylindricality shall not be less than grade 7, the surface roughness Ru shall not be greater than 0.4μm, and the hardness is 45~52HRC
b) The coaxiality between the cone surface and the guide diameter axis shall not be less than grade 5, its cylindricality shall not be less than grade 6, the surface roughness Ra shall not be greater than 0.4μm, and the hardness is 4552HRC.
A2.5 hydraulic lock
Test with 1.5 times the rated pressure in the reverse direction, maintain the pressure for 5 minutes, and there shall be no internal or external leakage. 986015mmzc) The axial position error of the valve stem distribution ring groove shall not exceed 0.2mm; d) The working surface of the valve stem is not allowed to have defects such as bruises and roughness. A2.4 Balancing valve
A2.4.1 The dynamic and static performance test content and methods of the balancing valve shall comply with the requirements of JB/T9739.1. A2.4.2 The positive pressure loss under rated flow shall not exceed 0.5MPa. A2.4.3 There shall be no internal leakage when maintaining pressure for 5 minutes under rated pressure (except for sliding valve type). A2.4.4 Valve body
a) The dimensional accuracy of the one-way valve aperture shall not be lower than H8, and the surface roughness Ra shall not be greater than 1.6μm; b) The coaxiality of the one-way valve hole and the one-way valve cone seat hole shall not be lower than Grade 5; c) The dimensional accuracy of the valve sleeve installation aperture shall not be lower than H8, its roundness shall not be lower than Grade 8, and the surface roughness Ra shall not be greater than 1.6umA2.4.5 Valve sleeve
a) The dimensional accuracy of the valve sleeve inner hole shall not be lower than H8, its roundness shall not be lower than Grade 6, and the surface roughness Ra shall not be greater than 0.4um; b) The coaxiality of the inner cone surface that serves as a seal and the axis of the guide hole shall not be lower than Grade 5, and the surface roughness Ra shall not be greater than 1.6μm. A2.4.6 Valve core
a) The outer diameter dimension accuracy of the valve core shall not be less than f8, its cylindricality shall not be less than grade 6, the surface roughness Ra shall not be greater than 0.4um, and the hardness shall not be less than 45-~52HRC;
b) The verticality of the end face that plays a positioning and sealing role to the outer diameter axis shall not be less than grade 6, and the surface roughness Ra shall not be greater than 0.8μm. A2.4.7 One-way valve core
a) The outer diameter dimension accuracy of the valve core shall not be less than f8, its cylindricality shall not be less than grade 7, the surface roughness Ru shall not be greater than 0.4μm, and the hardness is 45~52HRC
b) The coaxiality between the cone surface and the guide diameter axis shall not be less than grade 5, its cylindricality shall not be less than grade 6, the surface roughness Ra shall not be greater than 0.4μm, and the hardness is 4552HRC.
A2.5 hydraulic lock
Test with 1.5 times the rated pressure in the reverse direction, maintain the pressure for 5 minutes, and there shall be no internal or external leakage. 986015mmzc) The axial position error of the valve stem distribution ring groove shall not exceed 0.2mm; d) The working surface of the valve stem is not allowed to have defects such as bruises and roughness. A2.4 Balancing valve
A2.4.1 The dynamic and static performance test content and methods of the balancing valve shall comply with the requirements of JB/T9739.1. A2.4.2 The positive pressure loss under rated flow shall not exceed 0.5MPa. A2.4.3 There shall be no internal leakage when maintaining pressure for 5 minutes under rated pressure (except for sliding valve type). A2.4.4 Valve body
a) The dimensional accuracy of the one-way valve aperture shall not be lower than H8, and the surface roughness Ra shall not be greater than 1.6μm; b) The coaxiality of the one-way valve hole and the one-way valve cone seat hole shall not be lower than Grade 5; c) The dimensional accuracy of the valve sleeve installation aperture shall not be lower than H8, its roundness shall not be lower than Grade 8, and the surface roughness Ra shall not be greater than 1.6umA2.4.5 Valve sleeve
a) The dimensional accuracy of the valve sleeve inner hole shall not be lower than H8, its roundness shall not be lower than Grade 6, and the surface roughness Ra shall not be greater than 0.4um; b) The coaxiality of the inner cone surface that serves as a seal and the axis of the guide hole shall not be lower than Grade 5, and the surface roughness Ra shall not be greater than 1.6μm. A2.4.6 Valve core
a) The outer diameter dimension accuracy of the valve core shall not be less than f8, its cylindricality shall not be less than grade 6, the surface roughness Ra shall not be greater than 0.4um, and the hardness shall not be less than 45-~52HRC;
b) The verticality of the end face that plays a positioning and sealing role to the outer diameter axis shall not be less than grade 6, and the surface roughness Ra shall not be greater than 0.8μm. A2.4.7 One-way valve core
a) The outer diameter dimension accuracy of the valve core shall not be less than f8, its cylindricality shall not be less than grade 7, the surface roughness Ru shall not be greater than 0.4μm, and the hardness is 45~52HRC
b) The coaxiality between the cone surface and the guide diameter axis shall not be less than grade 5, its cylindricality shall not be less than grade 6, the surface roughness Ra shall not be greater than 0.4μm, and the hardness is 4552HRC.
A2.5 hydraulic lock
Test with 1.5 times the rated pressure in the reverse direction, maintain the pressure for 5 minutes, and there shall be no internal or external leakage. 986
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