Some standard content:
JB/T9739.1—2000
This standard is a revision of JB/T9739.1-1999 "Balance valve for truck cranes and tire cranes". This standard is a product standard for balance valves for hydraulic truck cranes and hydraulic tire cranes. It specifies the model compilation method, basic parameter values, technical requirements and test and detection methods. The implementation of this standard will promote the stable performance of the balance valve and improve the working reliability. Make the hoisting mechanism, luffing mechanism and telescopic mechanism of the crane using this component work smoothly, safely and reliably. This revision of the standard adds two chapters: Chapter 1 Scope and Chapter 2 Reference Standards. The article numbers and contents in each chapter are basically unchanged. The hydraulic graphic symbols have been modified according to GB/T786.1--1993. This standard replaces JB/T9739.1--1999 from the date of implementation. 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 person who revised this standard: Cao Zhongmei.
This standard was first issued in April 1988 as ZBJ80005--87, and the standard number was adjusted to JB/T9739.1--1999 in April 1999. The Changsha Construction Machinery Research Institute of the Ministry of Construction is responsible for the interpretation of this standard. 987
1 Scope
Machinery Industry Standard of the People's Republic of China
Truck crane and wheel crane
, Counterbalance' valve
Truck crane and wheel crane-Counterbalance' valveJB/T 9739.12000
Replaces JB/T9739.1-1999
This standard specifies the model, basic parameters, technical requirements, test methods, inspection rules, etc. of counterbalance valves for truck cranes and wheel cranes.
This standard applies to the externally controlled balancing valves (hereinafter referred to as balancing valves) used in the open hydraulic circuits of the hoisting mechanism, luffing mechanism and telescopic mechanism of cranes with the characteristic code of 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 the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T786.1-1993 Hydraulic and pneumatic graphic symbols GB/T2828--1987 Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) GB/T13306-1991
GB/T13384-1992 General technical conditions for packaging of electromechanical products JB/T1375-1992 Classification of truck cranes and tire cranes 3 Models, basic parameters series and graphic symbols 3.1 Model
Model diagram:
Design code
Approved by the State Machinery Industry Bureau on April 24, 2000 988
—Lifting
Threaded connection
Plate connection
Flange connection
Plug-in connection
Nominal diameter, mm
Nominal pressure level
Externally controlled balancing valve
- 31. 5MPa
2000-10-01 implementation
Model example:
3.2 Basic parameter series (see Table 1)
Nominal diameter
Nominal flow
Nominal pressure
Control pressure
Graphic symbol (see Figure 1)
4 Technical requirements
JB/T 9739.1-2000
Design code 2
For hydraulic circuit of bat mechanism
Threaded connection
Nominal diameter 20mm
Nominal pressure 25MPa
Externally controlled balancing valve
Basic parameter series
G-25 H--31. 5
2.0～~4.5
Balancing valves shall be manufactured according to drawings and technical documents approved by the prescribed procedures and meet the following performance requirements. 4.1 Static performance
4.1.1 Each moving part shall be sensitive and reliable without any sticking. 65
The working point of the balancing valve shall be able to make the pressure of the B chamber and C chamber (see Figure 1) of the balancing valve stable within its working range (see Figure 5).
4.1.3 When the B chamber is supplied with oil and the pressure is increased to the nominal pressure and maintained for 5 minutes, the leakage of the A chamber shall not exceed 1mL (except for the sliding valve structure). 4.1.4 When the C chamber is supplied with oil and the pressure is increased to 0.5 times the nominal pressure, the leakage of the A chamber shall not exceed 15mL/min. 4.1.5 Under the nominal flow rate of the balancing valve, the forward pressure loss (A chamber → B chamber) shall not exceed 0.6MPa. 989
4.2 Dynamic performance
JB/T 9739.1—2000
4.2.1 The number of damped oscillation waves of the valve core response curve is not more than 3. 4.2.2 The maximum overshoot of the valve core displacement Armx≤0.25r. (r-—the displacement of the valve core when it is working stably) (see Figure 3). 4.2.3 The valve core response lag time AT, ≤0.15s (see Figure 2). 4.2.4 The valve core closing lag time △T, ≤0.25 (see Figure 2). xip.
4.2.5 The valve core response transition time △T≤0.5s. Control pressure curve (Po) Circumferential core displacement curve (xr) AT2
4.2.6 The minimum stable flow rate of the balancing valve shall not be greater than 0.05 times its nominal flow rate. 4.3 Reliability
At nominal flow and nominal pressure, after the check valve and main valve core of the balancing valve have been subjected to 15,000 impact tests, the main parts shall not be damaged or abnormally worn, and their performance shall meet the requirements of 4.1 and 4.2. 5 Test method
5.1 Test conditions
5.1.1 Test oil
a) Oil temperature: When conducting the test, the temperature of the oil entering the balancing valve shall be 50°C ± 5°C; b) Viscosity: The kinematic viscosity of the oil shall be (20-28)10-6m2/s; c) The filtration accuracy shall not be less than 30μm;
d) The oil shall have anti-rust ability.
5.1.2 Test instruments and their accuracy
a) Pressure gauge: The accuracy is 1.0% (the accuracy for factory test is 1.5%). Direct reading pressure gauge, its range is 140% to 200% of the test pressure;
b) Flow meter: accuracy is 0.5% (accuracy for factory test is 1.0%); c) Pressure sensor: accuracy is 0.1%;
d) Displacement sensor: accuracy is 1.0%;
e) Dynamic strain gauge: accuracy is 0.2%;
f) Oscilloscope: accuracy is 0.2%.
5.2 Test
5.2.1 See Figure 3 for the schematic diagram of the test system.
JB/T 9739.1—2000
1—Test valve; 2-1, 2-2, 2-3, 2-4—Pressure gauge or pressure sensor; 3—Directional reversing valve; 4, 5—Overflow valve: 6—Adjustable flow valve: 7—Flowmeter; 8—Speed regulating valve; 9, 10—Hydraulic pump; 11—Heater: 12.13—Oil filter; 14—Thermometer; 15—Electromagnetic reversing valve: 16—Hydraulic oil tank Figure 3
5.2.2 See Table 2 for test items and methods. 5.3 Type test
See Figure 3 for the schematic diagram of the static test system.
See Figure 4 for the schematic diagram of the dynamic test system.
Table 2 Factory test items and methods
Action
Control pressure
Internal leakage
Test method
When the B chamber of the balancing valve is at nominal flow and nominal pressure, change the control pressure po of the C chamber to control the action of the balancing valve to reduce the pressure pr of the B chamber to 0.1 times the nominal pressure. Repeat this five times. When the B chamber of the balancing valve is at nominal flow and 1.1 times the nominal pressure, change the control pressure pc of the C chamber to control the action of the balancing valve and observe when the pressure p of the B chamber drops to the nominal pressure and 0.1 times the nominal pressure respectively. Perform random tests!
Control pressure pc value, repeat twicea) The A cavity of the balancing valve is disconnected from the reversing valve 3. The B cavity is supplied with oil and the pressure is increased to the nominal pressure. The pressure must be tested for
5 min. The internal leakage is detected from the A cavity;
b) The A cavity of the balancing valve is disconnected from the reversing valve 3, and the C cavity is supplied with oil and the pressure is increased to 0.5 times the nominal pressure. The pressure is maintained for 2 min. The internal leakage is detected from the A cavity
Block the B cavity, supply oil to the A cavity and increase the pressure to 1.5 times the nominal pressure, and maintain the pressure for 3min. Requirements
Comply with the provisions of 4.1.1
Comply with the provisions of Table 1
Comply with the provisions of 4.1.3 and 4.1.4
No leakage
JB/T 9739.1-2000
R..R., R: pressure sensor; M-test balancing valve; W-displacement sensor; G-weight; E-luffing hydraulic cylinder Figure 4
5.3.3 Type test items and methods are shown in Table 3. Table 3 Type test items and methods
Working range
Reliability
Internal leakage
Pressure loss
Dynamic performance
Minimum stable
Constant flow
Test method
When the balancing valve is at 1.1 times the nominal pressure and at the nominal flow and 0.75.0.25, 0.05pmax=nominal pressure, PBnin
times the nominal flow, change the control pressure prc value to open the balancing valve point by point, and obtain the pc value of each point (not less than five points) and the corresponding pr value (peB cavity pressure) a) The A cavity of the balancing valve is disconnected from the reversing valve 3, the B cavity is supplied with oil and the pressure is increased to the nominal pressure, and the pressure is maintained for 5 minutes, and the leakage of the A cavity is detected:
b) The A cavity of the balancing valve is disconnected from the reversing valve 3, the C cavity is supplied with oil and the pressure is increased to 0.5 times the nominal pressure, and the pressure is maintained for 2 min, detect the leakage of cavity A, take no less than five flow rates between 0.05 times the nominal flow rate and the nominal flow rate and pass through the balancing valve in the forward direction, and determine its pressure loss value. Draw the stable pressure difference △p from cavity A to cavity B-flow Q characteristic curve
The tested balancing valve is installed on the main engine variable amplitude circuit of the corresponding working flow rate (or the simulation test bench of the corresponding working flow rate), and its control pressure pc is adjusted to the maximum value (if adjustable). Under various working conditions, the reversing valve is operated in a sudden and rapid operation mode of pushing the reversing valve from the middle position to the full open within 0.5s. The control pressure pc, cavity B pressure pB, cavity A pressure p and valve core displacement curve are recorded synchronously by the displacement and pressure sensor through an oscilloscope or other recording instrument to change the speed of the liquid pump or the flow controlled by the reversing valve, and the minimum stable flow balancing valve is obtained at the nominal flow rate and nominal pressure, and the reversing impact is 15,000 times. It is carried out on the test bench. The schematic diagram of the test system is shown in Figure 3. ≤2.0MPa. The pz-pc curve group is drawn (see Figure 5) in accordance with the provisions of 4.1.3 and 4.1.4. In accordance with the provisions of 4.1.5, the steady-state pressure difference-flow curve is drawn (see Figure 6) in accordance with the provisions of 4.2.1 to 4.2.5. In accordance with the provisions of 4.2.6. In accordance with the provisions of 4.3. 6 Inspection rules Nominal flow JB/T 9739.1-2000 ad-d=a 6.1 Products shall be factory tested in accordance with the provisions of 5.2. The mandatory items shall be tested one by one and only qualified ones shall be allowed to leave the factory. 6.2 The quality inspection of the factory test items shall be carried out by sampling inspection in accordance with the provisions of GB/T2828. QL/min
6.3 For the balancing valve with a nominal flow rate exceeding 400L/min, the test flow rate shall not be less than 400L/min, and the reliability test of the balancing valve may not be carried out. 6.4 The dynamic test in the type test shall be carried out on the crane luffing hydraulic cylinder or the luffing hydraulic cylinder simulation test bench corresponding to the basic parameters of the tested valve in accordance with the relevant provisions of 5.3.2 before mass production. 6.5 The number of type tests shall be more than three, one of which shall be tested for all items, and the others shall only be tested for performance. For the unqualified items, the number of tests shall be doubled. If there are still unqualified ones, the type test of the batch of products shall be unqualified. 6.6 Cleanliness test
6.6.1 Before the cleanliness test, the outer surface of the tested product, the disassembly tools and the cleaning utensils shall be cleaned with gasoline (filtered with a 0.45um filter membrane).
6.6.2 Disassemble the product to be tested and put the parts one by one into 500mL gasoline (filtered with a 0.45um filter membrane) for cleaning. After cleaning, shake the cleaned gasoline thoroughly and take a sample of 100ml. The number of solid contamination particles in the sample should meet the following requirements: the number of particles larger than 5μm is less than 250×103, and the number of particles larger than 15um is less than 32×10°. 6.6.3 Cleanliness testing shall be carried out by sampling in accordance with the provisions of GB/T2828. 7 Marking, packaging and storage
7.1 Product labels shall comply with the relevant provisions of GB/T13306 and be installed upright and firmly in a conspicuous part of the product. The content of the label is as follows: a) Product name and graphic symbol;
b) Model and basic parameters;
c) Manufacturer name or trademark;
d) Manufacturing date and factory number.
7.2Print the same symbols as in Figure 1 near each connection port of the product, and seal it with a plastic cover after anti-rust treatment. 7.3The storage and transportation of the packaging box shall comply with the provisions of GB/T13384. The packaging box shall be moisture-proof and meet the requirements of land and water transportation. The contents of the packaging box are:
a) Product name;
b) Box number;
c) Overall dimensions (length × width × height);
d) Net weight and gross weight:
e) Destination station and receiving unit;
f) Departure station and shipping unit.
JB/T9739.12000
7.4This product should be fixed reliably in the box, and its surface should have anti-rust measures. The internal parts are not allowed to rust within one year from the date of leaving the factory.
7.5 The spare parts, instruction manual and packing list of this product should be packed in plastic bags. 7.6 This product should be packed in boxes and stacked in layers in a dry room without corrosive gas and water leakage.5 The number of type tests is more than three, one of which is tested for all items, and the rest are only tested for performance. The number of tests for unqualified items should be doubled. If there are still unqualified items, the type test of this batch of products is unqualified. 6.6 Cleanliness test
6.6.1 Before the cleanliness test, the outer surface of the tested product, disassembly tools and cleaning utensils should be cleaned with gasoline (filtered with a 0.45um filter membrane).
6.6.2 Disassemble the tested product and put the parts one by one into 500mL gasoline (filtered with a 0.45um filter membrane) for cleaning. After cleaning, shake the cleaned gasoline thoroughly and take a sample of 100ml. The number of solid contamination particles in the sample should meet the following requirements: the number of particles larger than 5μm is less than 250×103, and the number of particles larger than 15um is less than 32×10°. 6.6.3 Cleanliness test shall be carried out by sampling in accordance with the provisions of GB/T2828. 7 Marking, packaging and storage
7.1 Product labels shall comply with the relevant provisions of GB/T13306 and be installed neatly and firmly in a conspicuous part of the product. The content of the label is as follows: a) Product name and graphic symbol; Www.bzxZ.net
b) Model and basic parameters;
c) Manufacturer name or trademark;
d) Manufacturing date and factory number.
7.2 Print the same symbols as Figure 1 near each connection port of the product, and seal it with a plastic cover after rust-proof treatment. 7.3 The storage and transportation of packaging boxes shall comply with the provisions of GB/T13384. The packaging box should be moisture-proof and meet the requirements of land and water transportation. The contents of the packaging box include:
a) Product name;
b) Box number;
c) Overall dimensions (length × width × height);
d) Net weight and gross weight:
e) Destination station and receiving unit;
f) Departure station and shipping unit.
JB/T9739.12000
7.4 This product should be securely fixed in the box, its surface should have anti-rust measures, and the internal parts are not allowed to rust within one year from the date of manufacture.
7.5 The spare parts, instruction manual and packing list of this product should be packed in plastic bags. 7.6 This product should be packed in boxes and stacked in layers in a dry, non-corrosive gas and non-leaking room. 9945 The number of type tests is more than three, one of which is tested for all items, and the rest are only tested for performance. The number of tests for unqualified items should be doubled. If there are still unqualified items, the type test of this batch of products is unqualified. 6.6 Cleanliness test
6.6.1 Before the cleanliness test, the outer surface of the tested product, disassembly tools and cleaning utensils should be cleaned with gasoline (filtered with a 0.45um filter membrane).
6.6.2 Disassemble the tested product and put the parts one by one into 500mL gasoline (filtered with a 0.45um filter membrane) for cleaning. After cleaning, shake the cleaned gasoline thoroughly and take a sample of 100ml. The number of solid contamination particles in the sample should meet the following requirements: the number of particles larger than 5μm is less than 250×103, and the number of particles larger than 15um is less than 32×10°. 6.6.3 Cleanliness test shall be carried out by sampling in accordance with the provisions of GB/T2828. 7 Marking, packaging and storage
7.1 Product labels shall comply with the relevant provisions of GB/T13306 and be installed neatly and firmly in a conspicuous part of the product. The content of the label is as follows: a) Product name and graphic symbol;
b) Model and basic parameters;
c) Manufacturer name or trademark;
d) Manufacturing date and factory number.
7.2 Print the same symbols as Figure 1 near each connection port of the product, and seal it with a plastic cover after rust-proof treatment. 7.3 The storage and transportation of packaging boxes shall comply with the provisions of GB/T13384. The packaging box should be moisture-proof and meet the requirements of land and water transportation. The contents of the packaging box include:
a) Product name;
b) Box number;
c) Overall dimensions (length × width × height);
d) Net weight and gross weight:
e) Destination station and receiving unit;
f) Departure station and shipping unit.
JB/T9739.12000
7.4 This product should be securely fixed in the box, its surface should have anti-rust measures, and the internal parts are not allowed to rust within one year from the date of manufacture.
7.5 The spare parts, instruction manual and packing list of this product should be packed in plastic bags. 7.6 This product should be packed in boxes and stacked in layers in a dry, non-corrosive gas and non-leaking room. 994
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