JB/T 7165-1993 Rock drilling machinery and pneumatic tool assembly general
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T7165-93
Rock drilling machinery and pneumatic tools
General technical conditions for assembly
Published on November 21, 1993
Ministry of Machinery Industry of the People's Republic of China
Implementation on March 1, 1994
Mechanical Industry Standard of the People's Republic of China
Rock drilling machinery and pneumatic tools
General technical conditions for assembly
1 Subject content and scope of application
JB/T7165-93
This standard specifies the technical requirements, test methods, rust prevention, inspection rules, marking and certificates for the assembly of rock drilling machinery and pneumatic tools. This standard applies to the assembly of rock drilling machinery and pneumatic tool products. 2 Reference standards
GB10095
JB3576
JB/T7164
3 Technical requirements
Precision of involute cylindrical gears
Transmission tolerance of cylindrical gears
General technical conditions for rust prevention of rock drills and pneumatic tools General technical conditions for mechanical parts of rock drills and pneumatic tools 3.1 General assembly requirements
3.1.1 Parts and components must be inspected and qualified before they can be assembled. 3.1.2 Painted parts and components must not be assembled before the paint is dry. 3.1.3 Before assembling parts and components, chips, burrs, dripping dirt, mud and sand must be cleaned. The holes and grooves of the parts should be clean and unobstructed. 3.1.4 The mating surfaces of parts and components that require cleaning should be cleaned. 3.1.5 The parts and components cleaned with cleaning agents should be dried. 3.1.6
After cleaning the mating surfaces, they should be coated with a proper amount of lubricating oil (except for optional ones). When assembling parts and components, the mating surfaces are not allowed to have rust and scratches. The surfaces of parts and components that are required to seal gas and liquid shall not have leakage after assembly. The machining procedures during the assembly process shall comply with the provisions of JB/T7164. 3.1.9
3.1.10 During the assembly process, each lubrication point must be injected with a proper amount of lubricating oil or grease. 3.2 Fastener assembly requirements
3.2.1 During the assembly process, the corrugated part of the parts shall not be damaged. 3.2.2 The heads of bolts, screws and nut ends shall be in uniform contact with the plane of the fastened parts and shall not be tilted. It is not allowed to meet the requirements by beating.
3.2.3 When tightening the nails, bolts and end nuts, they must be tightened symmetrically and alternately. When the tightening torque requirement is not specified, the tightening torque can be referred to Appendix A (reference part).
3.2.4 After the nut is tightened, the end of the bolt and stud should be exposed 1.5~5 pitches outside the nut. 3.2.5 After the nut is tightened, the stop pad should bend the tongue ear immediately. The anti-loosening wire of the screw head should be installed in the direction of the screw. 3.2.6 When assembling threaded connectors with sealing and anti-loosening requirements, anaerobic glue is allowed, and the threads must be tightened in place with force at one time. 3.3 Assembly requirements for press-fit fittings
3.3.1 The guide angle of the parts should meet the requirements during assembly, and the mating surface should be coated with lubricating oil before press fitting. 3.3.2 During press fitting, tilted press-fitting is not allowed, the pressure-bearing surface should be evenly stressed, and the press-fitting process should be continuous. For slender and thin-walled parts, deformation should be prevented during press fitting. 3.3.3
Approved by the Ministry of Machinery Industry on November 21, 1993
Implemented on March 1, 1994
JB/T.716593
3.3.4 When assembling parts with small excess, it is allowed to use a hand chain to hit them, but it is not allowed to hit the assembled parts directly. 3.4 Assembly requirements for fitting parts using the temperature difference method
3.4.1 Assembly using the thermal expansion method
3.4.1.1 When assembling using the thermal expansion method, the assembly limit is generally 0.001~0.002 times the fitting diameter. 3.4.1.2
Where -
The heating temperature of the containing part! Generally, it should comply with the process requirements, and can also be calculated by referring to the following formula: o+e+t
Heating temperature of the containing part,;
3--actual interference of the connecting part, mm:
-selected assembly clearance, mm:
Linear expansion coefficient of the containing part material.1/C:
d-basic size of the matching diameter, mm;
to-assembly environment, ℃.
3.4.1.3 After hot-installed parts are installed, they should be cooled naturally, and local cooling should not be too fast. 3.4.2 Cold shrinkage assembly
3.4.2.1 When assembling by cold shrinkage, the assembly clearance shall be in accordance with the provisions of Article 3.4.1.1. 3.4.2.2 The shrinkage temperature t of the contained parts shall generally comply with the process requirements, and can also be calculated according to the formula in Article 3.4.1.2. 3.5 Requirements for rolling bearing assembly
3.5.1 The bearing shall be filled with grease during assembly, and the filling amount shall be preferably 1/3 to 1/2 of the inner and outer circumferential space of the bearing. 3.5.2 Bearings with non-metallic parts are not allowed to be assembled by the temperature difference method. 3.5.3 When the bearing is assembled by the press-in method, pressure is not allowed to be transmitted through its rolling elements. 3.5.4 The joint surfaces between the end face of the bearing, the gasket and the end cover after assembly shall be parallel. After tightening the screws, the gland shall be evenly attached to the pad drawing, and no local gap is allowed. If the drawing stipulates an axial gap, the gap shall be equal. 3.5.5 After the inner drawing of the bearing is matched, its end face shall be evenly in contact with the shaft shoulder or the distance ring. 3.5.6 After the tapered roller bearing is installed, the bearing clearance shall comply with the requirements of Table 1. Table 1 Axial clearance of tapered roller bearings
Contact angle between the roller and the outer diameter of the bearing
3
Bearing inner diameter
Distance value
>10~30
0.04~0.07
>30~50
0.05~0.1 0
10*~16°
>50~80
0.08~0.15
>80~120
0.12~0.20
>120~180
0.20~0.30
>180~260
3.5.7 After the bearing is assembled, it should rotate flexibly. Under normal working conditions, the bearing temperature rise shall not exceed 40C, and the maximum temperature shall not be higher than 80c.
3.6 Requirements for assembly of sliding bearings
3.6.1 The oil on the bushing and bearing shell shall be flat and clean. 3.6.2 The contact angle filter between the bearing shell and the journal shall meet the requirements of Table 2. Table 2 Contact angle between bearing and shaft diameter
Shaft rotation T/min
Contact angle (\)
70~100
3.6.3 The number of contact points between bearing and shaft shall comply with the provisions of Table 3. 2
Shaft rotation speed
JB/T716593
Table 3 The number of contact points between bearing and journal
≤100
Number of contact points (number of points on 25mm×25mm area)3~4
>100~500
3.6.4 Under normal working conditions, the bearing temperature rise shall not exceed 40℃, and the maximum temperature shall not be higher than 70℃. 3.6.5 After assembly, the shaft must be able to rotate flexibly. The axial play of the shaft shall comply with the provisions of Table 4. Table 4 Axial clearance of shaft
Bearing spacing height
3.7 Sprocket and chain assembly requirements
≤400
0.20~0.40
After the sprocket is installed, no axial movement is allowed. 3.7.1
>400~630
0.30~0.60
>630~1000
0.50~1.00
>1000~1600
0.75~1.60
3.7.2 The geometric center plane offset of the active and passive sprocket tooth widths shall not be greater than 2/1000 of the center distance between the two sprockets.3.7.3 The droop of the loose side of the chain shall be within the range of 1/100 to 5/100 of the center distance of the sprockets. 3.8 Assembly requirements for keys, splines and pins
During assembly, the key surface shall not be hit directly with a hammer. The mating surfaces of the key and keyway shall be in uniform contact. Keys and splines with clearance fit shall move freely after assembly. 3.8.3
3.8.4 After the split pin is assembled, the parts should be separated to both sides immediately, and the separation angle should be greater than 90°. 3.9 Spring assembly requirements
When the spring has directional requirements, it should be assembled in the specified direction. 3.9.1
When assembling the spring, the spring must not lose its ability to return to a free state. When using a set of springs of the same specification, attention should be paid to the consistency of their stiffness and length. Requirements for assembly of gears and gearboxes
When hot-fitting gears, the heating temperature must not be higher than their tempering temperature. The axial misalignment of the meshing gears in the gearbox is allowed to be 4/100 of the gear width, but not more than 2mm. After the gears are assembled, the contact spots and side clearances of the tooth surface should comply with the provisions of GB10095 and JB180. After the gearbox is assembled, an idling test should be carried out, and the following items should be checked: When the gears are shifted, the speed change mechanism should be flexible and accurate, and there should be no automatic disengagement or jump; there should be no abnormal sound during the operation of the gears:
There should be no oil leakage from the sealing surface, screw plug and other joints of the gearbox; there should be no looseness at all joints.
When the gearbox is continuously operated under load, the temperature rise of the oil shall not be greater than 40℃, and the maximum temperature shall not be higher than 70℃. After the gearbox test is completed, the support oil should be drained and the gearbox should be cleaned. Brake and clutch assembly requirements
When riveting brake parts, the rivets should be sunk to 1/3 of the thickness of the brake parts, and no rivet cracks should be found. After the brake parts are connected, the local clearance should meet the following requirements:
When the diameter is less than 500mm, it shall not be greater than 0.3mm; when the diameter is equal to or greater than 500mm, it shall not be greater than 0.5mm. When checking, the insertion depth of the feeler gauge shall not be greater than 1/3 of the brake band width and shall not be more than two places along the entire length. 3.11.2 When the band brake is in the relaxed state, the gap between the brake band and the brake wheel is 1~2.5mm. 3.11.3 When the block brake is in the relaxed state, the gap between the brake band and the brake drum is 0.25~0.50mm. 3.11.4 When the plate friction clutch is in When in the relaxed state, the active disk and the passive disk must be completely separated. JB/T716593
3.11.5 The dry friction plate must be dry and clean, and there must be no oil or debris on the working surface. 3.11.6 The friction contact area of the clutch should not be less than 75% of the total friction area. 3.11.7 The meshing type and friction type overrunning clutch should be clearly engaged and disengaged, and no slipping is allowed when engaged, and no jamming is allowed when overrunning. 3.12 Coupling assembly requirements
The coaxiality of the two couplings and the parallelism tolerance of the two end faces of the coupling shall comply with the provisions of Table 5. Table 5 Coaxiality and end face parallelism tolerance of coupling Coupling type
Cross slider type
Picking melon type
Gear type
Elastic pin type
3.13 Electrical system assembly requirements
Connector diameter
≤300
>300~600
170~185
220~250
290~430
490~590
105~260
290~500
Coaxiality
3.13.1 Various switches, maintenance devices and other components of the electrical system should be flexible and reliable. 3.13.2 Wires and cables should be connected correctly, the connection rate should be reliable, and there should be no cracks or cracks. 3.13.3 Acid flux should not be used at the welding part of the wire, there should be no cold welding at the welding place, and the welding surface should be smooth. End face parallelism
3.13. 4 The wiring should be bundled, arranged beautifully, and the wire ends should be marked. The parts where the wires are easily damaged should be protected by casings, and the wires in the casings should not have joints.
3.13.5 The wire tube should be fixed at the bends and when the length is greater than 800mm. When there are explosion-proof and leakage-proof requirements, it should be assembled strictly in accordance with the regulations. 3.13.6
3.14 Requirements for assembly of seals
Felt rings and asbestos ropes should not be soaked with oil before assembly. Various oil seals and seals should not be damaged. When installing, lubricating oil should be applied to the oil seal lip, the surface of the seal ring and the shaft. The assembly direction of the oil seal should make the working pressure of the medium press its lip tightly against the shaft. When assembling the combined seal rings, the various patterns should be pressed against each other. For seal rings with openings, the opening direction should be toward the side with greater pressure. When the oil seals and seals pass through keyways, screw holes, steps, etc., guide tools should be used for installation. O-rings should not be twisted or cut during assembly. The piston ring is not allowed to change the free state of the opening gap by pulling or pressing, and the piston ring is not allowed to be twisted. Non-rectangular piston rings should be assembled in the specified direction. 3.14.8
The piston ring should be installed in the ring groove flexibly and not stuck. When there is no positioning at the opening, the openings of the two adjacent piston rings on the same piston are staggered by 180*. 3.14.9
3.15 Assembly requirements of hydraulic system
Before assembly, the hydraulic components, oil tanks, and the inner walls of various pipes should be cleaned. 3.15.1
All kinds of pipes are not allowed to have dents, folds, flattening, twisting and cracking. If the exposed holes of the oil tank, oil pump, oil cylinder, and stuffy that are connected to the inner cavity cannot be installed immediately, they should be blocked with special plugs or wrapped with plastic cloth. It is strictly forbidden to block them with cotton yarn, cloth, paper scraps, etc. The inner surface of the oil tank is not allowed to be painted with paint that is easy to peel off. 3.15.4 When hydraulic oil is injected into the oil tank, it must be filtered. 3.15.5
There should be no abnormal sound when the hydraulic system is working. JB/T7165--93
3.15.6 When the hydraulic system is working, the maximum temperature of the oil shall not be higher than 60℃. After the test run, the test oil shall be dispersed and the oil tank and oil filter shall be cleaned. 3.15.7
Assembly requirements of fuel system
Oil circuits and oil pipes must be cleaned,
Carburettor and atomizer needle valves should be selected.
Various control valves should be assembled correctly, move flexibly, work reliably and fit well. When refueling, filtering should be performed to prevent dirt from entering the oil circuit. Assembly requirements of pneumatic system
Air circuits and air pipes must be cleaned.
Various control valves should be assembled correctly, move flexibly and work reliably. Various pipelines must be connected firmly without leakage. Test method
After the product is assembled, it should be tested according to the relevant standards. Rust prevention
The rust prevention of products and spare parts should comply with the provisions of JB3576. 6 Inspection rules
The assembled products shall be inspected and accepted by the quality inspection department of the manufacturer according to the drawings, relevant technical documents and this standard, and can be put into storage only after they are qualified.
7 Marks and certificates
7.1 Products that have passed the inspection shall be accompanied by the mark of the quality inspection department of the manufacturer. 7.2 The product shall be accompanied by technical documents such as the certificate of conformity before leaving the factory. Bolt performance grade
Corresponding material
Exhibition strength
Additional instructions:
90~110
120~150
170~210
230290
300~377
450530
540680
900~1100
14001700
2100~2500
JB/T 716593
Appendix A
Ordinary bolt tightening torque table
(reference)
110~140
150~190
210~270
290~350
370~450
550700
680~850
1120~1400
17102200
2600~3300||t t||93~124
145~193
199~264
282~376
384~512
488~650
714~952
969~1293
1694~2259
20002600
3100~3900
This standard is proposed and managed by Tianshui Liuyan Mechanical and Pneumatic Tools Research Institute of the Ministry of Machinery Industry. 10.9
110~130
180~210
280330
380~450
540~656
740~880
940~1120
1400~1650
1700~2000
2800~3350
4300~5160
6500~7800
This standard was drafted by Shenyang Pneumatic Tool Factory, Yichun Pneumatic Tool Factory, Yihua Mining Machinery Factory and Tianshui Pneumatic Tool Factory. The main drafters of this standard are Sun Jinlong, Han Mingqi, Liang Chun and Liao Zhenzhong. From the date of implementation of this standard, JB/SQ143-90 General Technical Conditions for Assembly of Rock Drilling Machinery and Pneumatic Tools will be invalid.9
110~130
180~210
280330
380~450
540~656www.bzxz.net
740~880
940~1120
1400~1650
1700~2000
2800~3350
4300~5160
6500~7800
This standard was drafted by Shenyang Pneumatic Tool Factory, Yichun Pneumatic Tool Factory, Yihua Mining Machinery Factory and Tianshui Pneumatic Tool Factory. The main drafters of this standard are Sun Jinlong, Han Mingqi, Liang Chun and Liao Zhenzhong. From the date of implementation of this standard, JB/SQ143-90 General Technical Conditions for Assembly of Rock Drilling Machinery and Pneumatic Tools will be invalid.
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