This standard specifies the test method for hydraulic cylinders. This standard applies to hydraulic cylinders (including double-acting hydraulic cylinders and single-acting hydraulic cylinders) with hydraulic oil (liquid) as the working medium. This standard does not apply to combined hydraulic cylinders. GB/T 15622-1995 Test method for hydraulic cylinders GB/T15622-1995 Standard download decompression password: www.bzxz.net

TpC621.6.057-592
National Standard of the People's Republic of China
GR/T 15622—1995
Test method of hydraulic cylinder
Hydrsulic fluid pover--Cytinders-test nethod1995-07-12Promulgated
National Technical Bureau
Implementation on 1996-05-01
National Standard of the People's Republic of China
Test method of hydraulic cylinder
Easy pressure poverCyltinder-test atethad1Content and applicable approval
This standard specifies the full-pressure test method.
GH/T15622-1995
This standard is used for pressure reducing cylinders (including double-acting pressure cylinders and single-acting hydraulic cylinders) with hydraulic oil (reducing) as the working medium. This standard does not apply to combined pressure reducing cylinders. 2 Reference standards
GB/T786.1 Hydraulic and pneumatic graphic symbols
G2349 Pressure-reducing systems and components series 3 Terms and symbols
3.1.1 Normal pressure: nominal value of pressure reduction working pressure, 3.1.2 Minimum starting pressure: the amount of pressure that starts the filter pressure 3.1.3 Rodless cavity, cavity without active rod,
3-1-4 Rod cavity, cavity with active support extending, 3.1.5 Theoretical output force acting on the effective impact of the piston or plunger, that is, the product of the oil pressure and the effective area of ​​the piston or plunger. 3.7.6 The actual output push (or pull) force 3. 1.7
Release efficiency, the percentage of the actual output and theoretical output of the chain pressure. 3.1. Buffer: The process of decelerating the piston rod by throttling the oil flow near the end of the hydraulic cylinder stroke. Symbols and units are shown in Table 1. Symbols and units Piston rod effective load International output Negative load rate National Technical Supervision Bureau 1995-07-12 Approved by the National Technical Supervision Bureau 1996-05-01 Field test 4 Test quantities and test conditions 4.7 Test materials CB/T15E22 —1995
4.1.1 Test equipment and hydraulic system quality diagrams are shown in Figures 1 to 5. Figure 1 Horizontal test device with embedded cylinder
Figure 2 Weight flag simulation test device
GBT15622-1995
Figure 3 Schematic diagram of hydraulic system for output test
1-Oiler+2-Following pressure system: 3. 14 Chapter 15-Reversing diagram 16-Power switch 7 --Pressure change, 8—Tested river, 9—Environmental measurement quantity
G/T15622-1995
Figure 4 Principle of type test hydraulic system
1—Oil selection group; 2—Liquid repellent; 3—Flow period: 1—One-way smoke: 5—Change network; 6—One-way bone flow period 13-Force switch: 3 Positive force meter one minus 10 before adding quantity GB/r15622-1995
Figure 5 Multi-stage hydraulic crown test bench Schematic diagram of pressure system 1—variable system 12—range room 13—reversing room 14—single room 5—loading liquid 6—test section 7-1, 7-2—pressure gauge FB—pressure gauge rise and fall, 9—dynamometer; 1—unidirectional width, 11—suction and drop reduction meter 113—lubrication seat meter: 13-motor, 14 flow monitor 4.1.2 Measurement accuracy
The measurement accuracy level is divided into B and C. The system accuracy must allow a 2-degree difference in the measurement value. In 2 measurement system, the system allows the reading of measurement points in the environment. The system allows the error pad in the center. When the standard pressure is below 2MPa, hPa, when the gauge pressure is equal to or greater than U-2MPa, 6Lu.r, 4.2 Test oil chain, 4.2.1 Viscosity: The kinematic viscosity of the oil at 40℃ is 29~74mm*/a (specified separately when special requirements are required). - 2. 5, 4.2-2 degrees, except for special provisions, type tests should be carried out at 50±2℃, and factory tests should be carried out at 50±4℃. 4.2.3. Cleanliness level, the solid contamination level of the test system oil filter shall not be higher than 19/16. 4.3 When the average indication value of the controlled parameter changes within the range of Table 3, it is allowed to record the measured value of the test parameter. 5
Control parameters
GB/T15622-1995
Table 3 Allowable variation of average indicated value of controlled parameters Measurement accuracy
When below 0.2MPa gauge pressure +kPr
When equal to or greater than 0.2MPa gauge pressure.%
Weight+￥
5 Test items and test methods
5.1 Test run
Adjust the system pressure so that the test cylinder can start under no-load conditions, and move up and down several times throughout the whole process to exhaust the air in the cylinder. 5.2 Starting pressure property test
After the test rate is changed, under no-load conditions, adjust the cross-flow valve to make the rodless cavity rise (causing the piston to support the cylinder, both adjustments are acceptable), until the pressure reducing cylinder starts, the recorded starting pressure is the minimum starting pressure, 5.3 Pressure resistance test
The test pressure siphon is stopped at the end of the cylinder (the single-acting gauge cylinder is at the stroke limit position), and the working chamber is input with 1.5 times the nominal pressure, and the pressure is maintained for more than 2 minutes. Special requirements are screw setting
5. Durability test
Under the constant force, the test full pressure siphon is operated at the design requirements at a high speed, the density error is mainly 10%, and it is continuously operated for more than 81. During the test, the parts of the tested cylinder shall not be adjusted, and the cumulative stroke shall be recorded. 5.5 Leakage test
5.5.1 Internal leakage: Inject oil of nominal pressure into the working chamber of the test cylinder, and measure the leakage from the piston rod to the un-pressure chamber. 5.5.2 Leakage test: When carrying out the test in 5.2.5.3.5.4.5.5.1, measure the leakage at the piston rod of the test cylinder, and there shall be no leakage at the joint surfaces.
5.6 Buffer test: Loosen all the pressure relief valves of the test cylinder, adjust the test pressure of the test hydraulic cylinder to 50% of the nominal pressure, and run it at a certain speed until the pressure relief valve is completely closed. 5.7 Load efficiency
×100% Calculate the negative efficiency at different pressures according to the formula, and draw the negative efficiency curve, Figure 6. Figure 6 Negative efficiency characteristic curve
High test
GB/T 15622—1995
Under rated pressure, the test pressure shall be fed with oil concentrate at 0°C and operated normally for 1 hour. 5.9 Stroke test
The test pressure piston or plunger shall be stopped at the two end limit positions and its stroke length shall be measured. 6 Type test items
6. 1 Test run (see 5.1)
6.2 Dynamic pressure characteristic test (see 5.2)
6. 3 Withstand pressure test (see 5.3)
6. 4 Durability test (see 5.4)
6.5 Leakage test (see 5.5)
6.6 Feedback test (see 5.6)
Negative efficiency test (width 5.7)
6-B high test (see 5.8) (Special products are specified separately) Stroke test (see 5.9)
7 Factory inspection items
7.1 Trial run (see 5.1) (mandatory inspection)bZxz.net
7.2 Starting pressure small characteristic test (see 5.2) ( 7.3 Acid pressure test (see 5.3) (mandatory)
7.4 Submersion test (see 5.5) (mandatory)
7.5 Durability test (5.4) (random sampling)
6 Stroke test (see 5.9) (mandatory)
Additional remarks:
This standard was proposed and coordinated by the National Technical Committee for Standardization of Pneumatics. This standard was drafted by the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. The main drafters of this standard were Fei Huailiang and Fan Tiantiao.
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