CN216199510U - Hydraulic platform for testing pressure cylinder - Google Patents
Hydraulic platform for testing pressure cylinder Download PDFInfo
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- CN216199510U CN216199510U CN202122415336.2U CN202122415336U CN216199510U CN 216199510 U CN216199510 U CN 216199510U CN 202122415336 U CN202122415336 U CN 202122415336U CN 216199510 U CN216199510 U CN 216199510U
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Abstract
The utility model relates to a hydraulic platform for testing a pressure cylinder, which is suitable for the pressure cylinder with the action frequency of 1-8 Hz and comprises an oil tank, a hydraulic pump, an electromagnetic valve and a sensor unit; an oil inlet of the hydraulic pump is communicated with an oil tank; the working port P of the electromagnetic valve is communicated with an oil outlet of the hydraulic pump through a first oil path, the working port A is communicated with the high-pressure side of a to-be-tested pressure cylinder through an oil supplementing branch path, the working port B is communicated with the low-pressure side of the to-be-tested pressure cylinder through a second oil path, an oil return port T is communicated with an oil tank through an oil return branch path, the working port P of the electromagnetic valve is communicated with the working port B in a first working state, the working port A is communicated with the oil return port T, the working port P of the electromagnetic valve is communicated with the working port A in a second working state, and the working port B is communicated with the oil return port T; the high-pressure side of the to-be-tested pressure cylinder is communicated with a load oil way, and the sensor unit comprises a plurality of pressure sensors which are arranged at an oil outlet of the hydraulic pump, an oil supplementing branch, the low-pressure side of the to-be-tested pressure cylinder and the high-pressure side of the to-be-tested pressure cylinder.
Description
Technical Field
The utility model belongs to the technical field of pressure cylinder performance testing, and particularly relates to a hydraulic platform for testing a high-frequency-action pressure cylinder.
Background
In the field of walking hydraulic pressure and industrial hydraulic pressure, a pressure cylinder is an actuating element which converts input low-pressure oil into high-pressure oil or ultrahigh-pressure oil by utilizing unequal action areas of pistons of two cavities. Generally, the frequency of the pressure cylinder is low due to the limitation of the sealing element and the machining precision, and the operation frequency of the piston of the pressure cylinder is about 25 to 45 times per minute. The existing test hydraulic platform is only suitable for the pressure cylinder with lower action frequency.
Along with the production requirement, a high-frequency pressure cylinder is increasingly needed, and the research and development of the high-frequency pressure cylinder are also paid attention by research and development personnel. In the development process of the high-frequency pressure cylinder, a hydraulic platform which is suitable for testing the high-frequency pressure cylinder needs to be designed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a hydraulic platform for testing a pressure cylinder.
The purpose of the utility model can be realized by the following technical scheme:
a hydraulic platform for testing a pressure cylinder comprises an oil tank, a hydraulic pump, an electromagnetic valve and a sensor unit;
the hydraulic pump is driven by the motor, and an oil inlet of the hydraulic pump is communicated with the oil tank;
the electromagnetic valve is provided with 4 oil ports and two working states, a working port P is communicated with an oil outlet of the hydraulic pump through a first oil path, a working port A is communicated with a high-pressure side of a to-be-tested pressure cylinder through an oil supplementing branch, a working port B is communicated with a low-pressure side of the to-be-tested pressure cylinder through a second oil path, an oil return port T is communicated with an oil tank through an oil return branch, the switching frequency of the working states of the electromagnetic valve is 1-8 Hz, and the requirement of high-frequency action of the to-be-tested pressure cylinder can be met;
the working port P of the electromagnetic valve is communicated with the working port B and the working port A is communicated with the oil return port T in the first working state, the working port P of the electromagnetic valve is communicated with the working port A and the working port B is communicated with the oil return port T in the second working state;
the oil supplementing branch is provided with an oil supplementing one-way valve, an oil supplementing energy accumulator and an oil supplementing overflow valve, the oil supplementing one-way valve can prevent hydraulic oil from flowing back to an oil tank from the high-pressure side of the to-be-tested pressure cylinder along the oil supplementing branch, the high-pressure side of the to-be-tested pressure cylinder is communicated with a load oil way, and the load oil way is provided with a load energy accumulator and a load overflow valve;
the sensor unit comprises a plurality of pressure sensors which are respectively arranged at an oil outlet of the hydraulic pump, an oil supplementing branch, the low-pressure side of the pressurization cylinder to be tested and the high-pressure side of the pressurization cylinder to be tested and are used for measuring the oil pressure of the oil outlet of the hydraulic pump, the oil pressure on the oil supplementing branch, the oil pressure of the low-pressure side of the pressurization cylinder to be tested and the oil pressure of the high-pressure side of the pressurization cylinder to be tested.
Preferably, the solenoid valve is a two-position four-way solenoid valve.
Preferably, the electromagnetic valve further comprises a signal generator, and the signal generator is connected with the electromagnetic valve and used for controlling the switching of the working state of the electromagnetic valve.
Preferably, the device further comprises an upper computer, wherein the upper computer is in communication connection with the sensor unit and is used for receiving the measurement data of the sensor unit.
Preferably, the system also comprises a data acquisition card, and the sensor unit is connected with the upper computer through the data acquisition card.
Preferably, the motor is a three-phase asynchronous motor.
Preferably, the hydraulic pump is a plunger pump or a gear pump.
Preferably, a throttle valve is arranged on the oil return branch to control the speed of the hydraulic oil flowing back to the oil tank, so that the situation that the diaphragms in the oil supplementing energy accumulator and the load energy accumulator deform too fast is avoided, and the oil supplementing energy accumulator and the load energy accumulator are protected.
Preferably, an overflow valve is arranged on the first oil path, so that the oil pressure at the outlet of the hydraulic pump is controlled, the hydraulic pump is protected, the ultrahigh pressure protection is realized, and leakage or pipeline breakage caused by overhigh oil pressure is prevented.
Preferably, an oil outlet of the overflow valve is communicated with an oil tank.
Preferably, the oil outlet of the oil-supplementing overflow valve and the oil outlet of the load overflow valve are communicated with an oil tank.
Preferably, the oil-saving device further comprises a filter, the filter is arranged at an oil inlet of the oil tank, the oil return branch is connected to the oil inlet of the oil tank, and oil outlets of the overflow valve, the oil-supplementing overflow valve and the load overflow valve are connected to the oil inlet of the oil tank.
Compared with the prior art, the utility model has the following beneficial effects:
(1) the electromagnetic valve has two different working states, high-frequency reversing is realized by switching the working states of the electromagnetic valve, and the test requirement of the pressure cylinder with higher piston action frequency is met.
(2) The load accumulator is used as the load of the pressure cylinder to be tested on the load oil path, and compared with a mechanical load, the load accumulator can avoid the problem of abrasion caused by high-frequency action.
(3) The high-pressure side of the pressure cylinder to be tested is supplemented with hydraulic oil through the oil supplementing branch, oil loss caused by leakage is compensated, the pressure cylinder to be tested is ensured to be reset to the lower dead point, and the pressure cylinder to be tested is ensured to run stably.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of theoretical pressures for a hydraulic platform;
reference numerals: 1. the device comprises a motor, 2, a hydraulic pump, 3, an electromagnetic valve, 4, a pressure cylinder to be tested, 4a, the low-pressure side of the pressure cylinder to be tested, 4b, the high-pressure side of the pressure cylinder to be tested, 5, an overflow valve, 6, a load energy accumulator, 7, a load overflow valve, 8, an oil supplementing one-way valve, 9, an oil supplementing energy accumulator, 10, an oil supplementing overflow valve, 11, a throttle valve, 12, a pressure sensor, 13, a signal generator, 14, a collection card, 15, an upper computer, 16 and an oil tank.
Detailed Description
The utility model is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. In the drawings, components have been enlarged where appropriate to make the drawings clearer.
In the description of the embodiments of the present application, it is to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, refer to the orientation or positional relationship as shown in the drawings, or as conventionally placed in use of the product of the application, or as conventionally understood by those skilled in the art, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present application.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Example 1:
a hydraulic platform for testing a pressure cylinder is shown in figure 1 and comprises a motor 1, a hydraulic pump 2, an electromagnetic valve 3, a pressure cylinder 4 to be tested, an overflow valve 5, a load energy accumulator 6, a load overflow valve 7, an oil supplementing one-way valve 8, an oil supplementing energy accumulator 9, an oil supplementing overflow valve 10, a throttle valve 11, a signal generator 13, a collection card 14, an upper computer 15 and a sensor unit, wherein the sensor unit comprises 4 groups of pressure sensors 12.
Wherein, hydraulic pump 2 is driven by motor 1, for hydraulic platform provides the power supply, and hydraulic pump 2 can be plunger pump or gear pump, and motor 1 can be three-phase asynchronous motor.
The electromagnetic valve 3 is provided with 4 oil ports and two working states, the switching frequency of the two working states of the electromagnetic valve 3 is 1-8 Hz, and the test requirement of the pressurization cylinder 4 to be tested with high-frequency action can be met. The working port P is communicated with an oil outlet of the hydraulic pump 2 through a first oil path, the working port A is communicated with a high-pressure side 4B of the booster cylinder 4 to be tested through an oil supplementing branch path, the working port B is communicated with a low-pressure side 4a of the booster cylinder 4 to be tested through a second oil path, the oil return port T is communicated with the oil tank 16 through an oil return branch path, the working port P of the electromagnetic valve 3 is communicated with the working port B in a first working state, the working port A is communicated with the oil return port T, the working port P of the electromagnetic valve 3 is communicated with the working port A in a second working state, and the working port B is communicated with the oil return port T;
an oil inlet of the hydraulic pump 2 is communicated with an oil tank 16, an oil outlet of the hydraulic pump 2 is communicated with a working port P of the electromagnetic valve 3 through a first oil way, an overflow valve 5 is arranged on the first oil way, the oil pressure at the outlet of the hydraulic pump 2 is controlled, the hydraulic pump 2 is protected, ultrahigh pressure protection is realized, and leakage or pipeline breakage caused by overhigh oil pressure is prevented. In this embodiment, the oil outlet of the overflow valve 5 is communicated with an oil tank 16.
The high-pressure side 4b of the pressure cylinder 4 to be tested is communicated with a load oil way, a load energy accumulator 6 and a load overflow valve 7 are arranged on the load oil way, and the load energy accumulator 6 is used as the load of the pressure cylinder 4 to be tested. The oil supplementing one-way valve 8, the oil supplementing energy accumulator 9 and the oil supplementing overflow valve 10 are arranged on the oil supplementing branch, the oil supplementing one-way valve 8 can prevent hydraulic oil from flowing back to the oil tank 16 from the high-pressure side 4b of the pressurizing cylinder 4 to be tested along the oil supplementing branch, the oil supplementing energy accumulator 9 and the oil supplementing overflow valve 10 are used for stabilizing the pressure of the oil supplementing branch, so that the oil supplementing branch is maintained at a stable pressure, when the electromagnetic valve 3 is in the second working state, the hydraulic oil flowing out of the oil outlet of the hydraulic pump 2 flows into the oil supplementing branch through the P port and the A port, and the pressure of the oil supplementing branch is maintained at the oil supplementing pressure. When the high-pressure side 4b of the pressure cylinder 4 to be tested causes oil loss due to leakage and the pressure is reduced to be lower than the oil supplementing pressure, oil enters the high-pressure side 4b of the pressure cylinder 4 to be tested from the oil supplementing branch through the oil supplementing one-way valve 8 so as to supplement the oil loss and ensure that the piston of the pressure cylinder 4 is reset to the bottom dead center. In this embodiment, the oil outlet of the oil-supplementing overflow valve 10 and the oil outlet of the load overflow valve 7 are communicated with the oil tank.
The oil supplementing energy accumulator 9 is arranged between the oil supplementing one-way valve 8 and the electromagnetic valve 3, and the oil supplementing one-way valve 8 is arranged on the oil supplementing branch road and close to the high-pressure side 4b of the booster cylinder 4 to be tested.
And a filter is further arranged at an oil inlet of the oil tank 16 and used for filtering impurities in the hydraulic oil, an oil return branch is connected to the oil inlet of the oil tank 16, and oil outlets of the overflow valve 5, the oil supplementing overflow valve 10 and the load overflow valve 7 are connected to the oil inlet of the oil tank 16.
The oil supplementing energy accumulator 9 and the load energy accumulator 6 are air bag type energy accumulators, a throttle valve 11 is arranged on an oil return branch to control the speed of hydraulic oil flowing back to an oil tank 16, the situation that diaphragms in the oil supplementing energy accumulator 9 and the load energy accumulator 6 deform too fast is avoided, and the oil supplementing energy accumulator 9 and the load energy accumulator 6 are protected.
The sensor unit comprises a plurality of pressure sensors 12 which are respectively arranged at an oil outlet of the hydraulic pump 2, an oil supplementing branch, a low-pressure side 4a of the pressure cylinder 4 to be tested and a high-pressure side 4b of the pressure cylinder 4 to be tested and are used for measuring the oil pressure of the oil outlet of the hydraulic pump 2, the oil pressure on the oil supplementing branch, the oil pressure of the low-pressure side 4a of the pressure cylinder 4 to be tested and the oil pressure of the high-pressure side 4b of the pressure cylinder 4 to be tested.
The signal generator 13 is connected to the solenoid valve 3 and is used for controlling the switching of the working state of the solenoid valve 3. In this embodiment, the solenoid valve 3 is a two-position four-way solenoid valve, the working port P is communicated with the working port B when the solenoid valve is powered on, the working port a is communicated with the oil return port T, the working port P is communicated with the working port a when the solenoid valve is powered off, the working port B is communicated with the oil return port T, and the signal generator 13 controls the two-position four-way solenoid valve to be powered on and powered off at a certain frequency, so that switching between two working states can be achieved. The on-off frequency of the two-position four-way electromagnetic valve is 1-8 Hz, and the requirement of high-frequency action of the pressure cylinder 4 to be tested can be met.
The pressure sensor 12 in the sensor unit is connected with the upper computer 15 through the data acquisition card 14, the data acquisition card 14 is used for realizing A/D conversion, the upper computer 15 receives the measurement data of the sensor unit, further oil pressure monitoring of each key position of the hydraulic platform is realized, and the operating state of the pressure cylinder 4 to be tested is judged based on the pressure property acquired by the pressure sensor 12, so that the test of the pressure cylinder 4 to be tested is completed.
The specific performance test procedure is as follows:
(1) and selecting the displacement of the hydraulic pump 2 and the volumes of the oil supplementing accumulator 9 and the load accumulator 6 according to the size of the cavity of the pressure cylinder 4 to be tested and the action frequency. For example, the capacity of the low-pressure side 4a of the pressure cylinder 4 to be tested is 110ml, the action frequency is 1-8 Hz, and the displacement of the hydraulic pump 2 is not less than 66L/min. The volume of the high-pressure side 4b of the pressure cylinder 4 to be tested is 50ml, and the volumes of the oil supplementing accumulator 9 and the load accumulator 6 are not less than 70 ml.
(2) And determining the pre-charging pressure of the oil supplementing energy accumulator 9 and the load energy accumulator 6 according to the maximum working pressure of the oil supplementing energy accumulator 9 and the load energy accumulator 6. For example, if the maximum working pressure of the load accumulator 6 is 25MPa, the pre-charging pressure of the load accumulator 6 is 3.5 MPa; the maximum working pressure of the oil supplementing energy accumulator 9 is 5MPa, and the pre-charging pressure of the oil supplementing energy accumulator 9 is not lower than 0.7 MPa.
(3) The opening pressures of the overflow valve 5, the load overflow valve 7 and the oil-replenishing overflow valve 10 are set. For example, the opening pressure of the load overflow valve 7 is 25MPa, the opening pressure of the oil-replenishing overflow valve 10 is 5MPa, and the opening pressure of the overflow valve 5 is 15 MPa.
(4) The throttle valve 11 is adjusted to control the rate of return of hydraulic oil to the tank 16.
(5) The setting signal generator 13, for example, the setting signal generator 13 controls the frequency of the power-on/power-off of the electromagnetic valve 3 to be 1-8 Hz.
(6) In the specific test process, the signal generator 13 is started firstly to enable the electromagnetic valve 3 to be periodically switched on and off, then the motor 1 is started to drive the hydraulic pump 2 to provide hydraulic oil for the hydraulic platform, so that the reciprocating motion of the piston of the pressure cylinder 4 to be tested is controlled, and the test of the high-frequency action of the pressure cylinder 4 to be tested is realized.
When the electromagnetic valve 3 is in a first working state (namely, the two-position four-way electromagnetic valve is electrified), the port P is communicated with the port B, and the port T is communicated with the port A. The port P is communicated with the port B, hydraulic oil flows out from an oil outlet of the hydraulic pump 2, enters the low-pressure side 4a of the to-be-tested booster cylinder 4 through the port P and the port B of the electromagnetic valve 3, drives a piston of the to-be-tested booster cylinder 4 to move towards a top dead center, so that the hydraulic oil on the high-pressure side 4B of the to-be-tested booster cylinder 4 is driven, and the hydraulic oil on the high-pressure side 4B of the to-be-tested booster cylinder 4 compresses the load energy accumulator 6 on a load oil way. Along with the movement of the piston of the booster cylinder 4 to be tested, the pressure of the load energy accumulator 6 is increased, the load overflow valve 8 is jacked open, and partial hydraulic oil flows out to limit the pressure on a load oil way. The port T is communicated with the port A, hydraulic oil in the oil supplementing energy accumulator 9 is discharged from the oil supplementing energy accumulator 9 and flows back to the oil tank 16 under the drive of air pressure of the oil supplementing energy accumulator 9, and the backflow speed is controlled by the throttle valve 11 so as to prevent the oil supplementing energy accumulator 9 from being damaged due to too fast backflow.
When the electromagnetic valve 3 is powered off, the port T is communicated with the port B, and the port P is communicated with the port A. The port P is communicated with the port A, hydraulic oil flows out of an oil outlet of the hydraulic pump 2 and enters the oil supplementing branch through the port P and the port A, the oil supplementing energy accumulator 9 is compressed, the pressure of an oil supplementing way is increased to the opening pressure of the oil supplementing overflow valve 10, the oil supplementing overflow valve 10 is jacked open, part of the hydraulic oil flows out, and the pressure of the oil supplementing branch is maintained at a stable level. The port T is communicated with the port B, the low-pressure side 4a of the pressure cylinder 4 to be tested is communicated with the oil tank 16 through the port B, hydraulic oil in the load energy accumulator 6 is driven by air pressure of the load energy accumulator 6 and is discharged from the load energy accumulator 6, the piston of the pressure cylinder 4 to be tested is pushed to move towards a bottom dead center, and therefore the hydraulic oil on the low-pressure side 4a of the pressure cylinder 4 to be tested is driven to flow back to the oil tank 16, the backflow speed is controlled by the throttle valve 11, and the load energy accumulator 6 is prevented from being damaged due to too fast backflow. After the load energy accumulator 6 is reset, the load energy accumulator 6 does not discharge hydraulic oil any more, and at the moment, the hydraulic pressure of the high-pressure side 4a of the pressure cylinder 4 to be tested is reduced to be lower than the pressure of the oil supplementing branch, the hydraulic oil in the oil supplementing branch flows to the high-pressure side 4b of the pressure cylinder 4 to be tested, oil is supplemented to the high-pressure side 4b of the pressure cylinder 4 to be tested, and meanwhile, the piston is driven to continue to move towards the bottom dead center until the piston reaches the bottom dead center.
(7) The pressure sensor 12 collects pressure signals, and the operating state of the pressure cylinder 4 to be tested is judged according to pressure curves, and theoretical pressure curves of the pressure signals are shown in fig. 2.
The existing hydraulic platform generally adopts a mechanical load, the high-frequency reciprocating motion easily causes abrasion, and the hydraulic platform is not suitable for testing the high-frequency acting pressure cylinder, the electromagnetic valve is used for reversing, the reversing frequency is 1-8 Hz, and the testing requirement of the high-frequency acting pressure cylinder can be met.
The foregoing detailed description of the preferred embodiments of the utility model has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A hydraulic platform for testing a pressure cylinder is characterized by comprising an oil tank, a hydraulic pump, an electromagnetic valve and a sensor unit;
the hydraulic pump is driven by the motor, and an oil inlet of the hydraulic pump is communicated with the oil tank;
the electromagnetic valve is provided with 4 oil ports and two working states, a working port P is communicated with an oil outlet of the hydraulic pump through a first oil path, a working port A is communicated with a high-pressure side of a pressure cylinder to be tested through an oil supplementing branch, a working port B is communicated with a low-pressure side of the pressure cylinder to be tested through a second oil path, an oil return port T is communicated with an oil tank through an oil return branch, the working port P of the electromagnetic valve is communicated with the working port B in the first working state, the working port A is communicated with the oil return port T, the working port P of the electromagnetic valve is communicated with the working port A in the second working state, and the working port B is communicated with the oil return port T;
the high-pressure side of the pressure cylinder to be tested is communicated with a load oil way, and the load oil way is provided with a load energy accumulator and a load overflow valve;
the sensor unit comprises a plurality of pressure sensors which are respectively arranged at an oil outlet of the hydraulic pump, an oil supplementing branch, a low-pressure side of the to-be-tested booster cylinder and a high-pressure side of the to-be-tested booster cylinder.
2. The hydraulic platform for the test of the pressure cylinder according to claim 1, further comprising a signal generator connected with the solenoid valve for controlling the switching of the working state of the solenoid valve.
3. The hydraulic platform for the test of the pressure cylinder according to claim 1, further comprising an upper computer, wherein the upper computer is in communication connection with the sensor unit and is used for receiving the measurement data of the sensor unit.
4. The hydraulic platform for the test of the pressure cylinder according to claim 3, further comprising a data acquisition card, wherein the sensor unit is connected with the upper computer through the data acquisition card.
5. The hydraulic platform for the testing of pressurized cylinders of claim 1, wherein the motor is a three-phase asynchronous motor.
6. The hydraulic platform for pressurized cylinder testing of claim 1, wherein the hydraulic pump is a plunger pump or a gear pump.
7. The hydraulic platform for testing the pressure cylinders of claim 1, wherein a throttle valve is arranged on the oil return branch.
8. The hydraulic platform for the test of the pressure cylinder according to claim 1, wherein an overflow valve is arranged on the first oil path.
9. The hydraulic platform for the booster cylinder test of claim 8, wherein an oil outlet of the overflow valve is communicated with an oil tank.
10. The hydraulic platform for the booster cylinder test as recited in claim 1, wherein an oil outlet of the oil-replenishing overflow valve and an oil outlet of the load overflow valve are communicated with an oil tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122415336.2U CN216199510U (en) | 2021-10-08 | 2021-10-08 | Hydraulic platform for testing pressure cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122415336.2U CN216199510U (en) | 2021-10-08 | 2021-10-08 | Hydraulic platform for testing pressure cylinder |
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| Publication Number | Publication Date |
|---|---|
| CN216199510U true CN216199510U (en) | 2022-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122415336.2U Active CN216199510U (en) | 2021-10-08 | 2021-10-08 | Hydraulic platform for testing pressure cylinder |
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| CN (1) | CN216199510U (en) |
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2021
- 2021-10-08 CN CN202122415336.2U patent/CN216199510U/en active Active
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