CN221173780U - High-pressure test equipment for piston rod sealing element - Google Patents
High-pressure test equipment for piston rod sealing element Download PDFInfo
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- CN221173780U CN221173780U CN202323277076.2U CN202323277076U CN221173780U CN 221173780 U CN221173780 U CN 221173780U CN 202323277076 U CN202323277076 U CN 202323277076U CN 221173780 U CN221173780 U CN 221173780U
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- 238000012360 testing method Methods 0.000 title claims abstract description 105
- 238000007789 sealing Methods 0.000 title claims abstract description 61
- 230000017525 heat dissipation Effects 0.000 claims description 19
- 230000002457 bidirectional effect Effects 0.000 claims description 12
- 238000003780 insertion Methods 0.000 claims description 9
- 230000037431 insertion Effects 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000000110 cooling liquid Substances 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 4
- 239000000446 fuel Substances 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract description 5
- 238000004088 simulation Methods 0.000 abstract description 3
- 210000001503 joint Anatomy 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 16
- 239000010720 hydraulic oil Substances 0.000 description 13
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model provides high-pressure testing equipment for a piston rod sealing element, which comprises a testing cylinder group, a pressurizing cylinder group and a moving driving element. The test cylinder group comprises a test cylinder, a pressure gauge and a rod piece. The testing cylinder comprises a cylinder body and an end cover, and encloses a closed space. The end cover is provided with a shaft hole, and the inner wall of the shaft hole is sequentially provided with an annular groove of a piece to be detected, a pressure measuring hole of the butt joint pressure gauge and a seal. The rod piece penetrates through the two end covers, and a sealing piece to be detected is sleeved at the annular groove of the sealing piece. The pressurizing cylinder group applies high pressure to the oil in the closed space. The movable driving piece is connected with the rod piece to drive the rod piece to reciprocate. According to the utility model, the rod piece penetrates through the closed space, so that the hydraulic pressure born by the rod piece is balanced, the high-pressure motion environment of the sealing piece to be tested is simulated, the load simulation of the rod piece is banned, the power and the electricity consumption of the movable driving piece can be greatly reduced, and the sealing test of the sealing piece to be tested is realized at lower cost.
Description
Technical Field
The utility model relates to the technical field of testing equipment, in particular to high-pressure testing equipment for a piston rod sealing element.
Background
The application of the sealing element is very wide and important, and is a part which cannot be ignored by various devices, especially high-pressure hydraulic devices. To ensure proper operation of the device, a acceptable seal is required. In the research and development stage, the sealing element needs to be subjected to strict test, particularly the sealing element used by high-voltage equipment, the testing environment of the sealing element needs to have high-voltage conditions and guarantee the service life of hundreds of thousands of times of movements, the traditional testing equipment simulates the high-voltage movement environment in a load mode, the high-load pressure is utilized to reach the high-voltage conditions, the load is pushed to work, the simulation of the high-voltage movement environment is realized, and the test times of the back and forth movement are very high. Along with the increase of the test times and time, the cost required by the test is increased, and generally, tens of thousands of yuan of electricity charge is consumed, so that higher cost is brought to the research and development of the sealing element.
Disclosure of utility model
The utility model provides sealing element testing equipment with lower testing cost, which can test sealing elements used on a piston rod.
A high-pressure test device for a piston rod sealing member comprises a test cylinder group, a pressurizing cylinder group and a moving driving member, wherein,
The test cylinder group comprises a test cylinder, a pressure gauge and a rod piece. The testing cylinder comprises a cylinder body and an end cover, and the cylinder body and the end cover enclose a closed space.
The end cover is provided with a shaft hole, the inner wall of the shaft hole is sequentially provided with an annular groove of a piece to be detected, a pressure measuring hole and an annular groove of a sealing piece, and the annular groove of the piece to be detected is close to the airtight space. The pressure gauge is abutted with the pressure measuring hole. The rod piece penetrates through the two end covers, and a sealing piece is sleeved at the annular groove of the sealing piece.
The pressurizing cylinder group is communicated with the closed space and applies high pressure to oil in the closed space.
The movable driving piece is connected with the rod piece to drive the rod piece to reciprocate on the test cylinder.
When the pressure measuring device is used, the to-be-measured piece is arranged in the annular groove of the to-be-measured piece of the end cover, and at the moment, the to-be-measured piece is equivalent to forming a seal between the pressure measuring hole and the closed space. And starting the pressurizing cylinder group and the movable driving piece, applying high pressure to the closed space and the piece to be tested, and driving the rod piece to enable the rod piece and the piece to be tested to have relative movement, so that the testing condition of the piece to be tested is realized.
According to the utility model, the rod penetrates through the closed space, so that the hydraulic pressure born by the rod is balanced, and the high-pressure environment in the closed space does not form resistance to the back and forth movement of the rod, so that the power and the electricity consumption of the movable driving part can be greatly reduced, and the sealing test of the part to be tested is realized at lower cost.
Preferably, two end covers all are equipped with measured piece ring channel, pressure tap and sealing member ring channel, manometer and sealing member have two sets of, promptly test equipment can test two measured pieces simultaneously, can provide contrast test or high efficiency test.
Preferably, an insertion ring is arranged at the inner side end part of the end cover, the insertion ring is inserted into two ends of the cylinder body, and a sealing structure is arranged between the insertion ring and the inner peripheral wall of the cylinder body, so that the sealing performance of the closed space is improved.
Preferably, the sealing structure comprises an annular sealing groove and a sealing ring, and the supporting ring is further arranged because the testing environment is a high-pressure environment, the side part of the sealing member is required to be supported, and the sealing member is prevented from being deformed and damaged under the action of high pressure. The annular seal groove is arranged at the periphery of the insertion ring or the inner peripheral wall of the cylinder body, the seal ring and the support ring are both sleeved in the annular seal groove, and the seal ring is positioned at one side close to the closed space.
Preferably, the outside tip of end cover is equipped with the mounting groove that encircles the member, be equipped with the dust cover in the mounting groove, reduce the dust and get into in the airtight space.
Preferably, the circumference of the cylinder body is provided with a mounting seat, and the mounting seat is provided with a through hole communicated with the closed space. The pressurizing cylinder group is arranged on the mounting seat and communicated with the closed space through the through hole. The periphery of the cylinder body is also provided with an upward exhaust hole, the exhaust hole is provided with a plug, when hydraulic oil is added into the closed space, the plug is required to be taken out, the exhaust hole is opened, air in the closed space is discharged when the hydraulic oil is added, and when the hydraulic oil overflows from the exhaust hole, the air is completely discharged, and the plug is blocked.
Preferably, the pressurizing cylinder group includes a pressurizing cylinder and a piston rod. The pressurizing cylinder is provided with a pressurizing cavity and a high-pressure cavity which are coaxial, the output end of the high-pressure cavity is communicated with the airtight space, and the diameter of the high-pressure cavity is smaller than that of the pressurizing cavity. One end of the piston rod is inserted into the pressurizing cavity and extends into the high-pressure cavity. The middle part of the piston rod is provided with a piston, the piston reciprocates in a pressurizing cavity, and the pressurizing cavity is provided with pressurizing holes at two ends of the piston, so that the pressurizing cavity and the piston rod form a bidirectional hydraulic cylinder. And the ends of the piston rod, the pressurizing cavity and the high-pressure cavity are sealed. When the piston rod is further inserted into the pressurizing cavity and the high-pressure cavity, the end part of the piston rod extrudes hydraulic oil in the high-pressure cavity to improve the oil pressure in the high-pressure cavity, and the diameter of the high-pressure cavity is smaller than that of the pressurizing cavity, so that the oil pressure in the high-pressure cavity is higher than that in the pressurizing cavity, namely, the pressurizing cylinder group provided by the utility model can acquire larger oil pressure by using smaller oil pressure to meet the testing requirement.
Preferably, the periphery of the high-pressure chamber is provided with an oil filling hole through which hydraulic oil can be filled into the sealed space and the high-pressure chamber.
Preferably, the movable driving part comprises two bidirectional hydraulic cylinders and a connecting rod, wherein the two bidirectional hydraulic cylinders are symmetrically arranged at two ends of the test cylinder group and are parallel to the rod piece. The telescopic rods of the two bidirectional hydraulic cylinders are connected through the connecting rods to drive the rod pieces to reciprocate, the structure is simple, flexible driving force is provided, vibration of test equipment is reduced, and more real test data are obtained.
Preferably, because hydraulic oil is continuously pressurized and depressurized during testing, and the rod piece moves back and forth to generate high temperature, a heat dissipation piece is required to be arranged, and the testing equipment further comprises a heat dissipation sleeve which is coated on the periphery of the cylinder body of the testing cylinder to form a heat dissipation cavity. At least two cooling liquid circulation holes are arranged at the periphery of the cooling sleeve, and the cooling liquid circulation holes are communicated with the cooling cavity. When the temperature of the test cylinder group is higher, the heat dissipation function can be provided for the test cylinder group through low-temperature liquid or gas which circularly flows, and when a test piece is required to be tested at a high temperature or a certain set temperature, the temperature can be controlled through the heat dissipation sleeve.
From the above description of the utility model, the utility model has the following advantages:
The rod piece penetrates through the airtight space, so that the hydraulic pressure born by the rod piece is balanced, the high-pressure motion environment of the sealing piece to be tested is simulated, the load simulation of the rod piece is avoided, the power and the electricity consumption of the movable driving piece can be greatly reduced, and the sealing test of the piece to be tested is realized at lower cost;
Two pieces to be tested can be tested simultaneously, and a contrast test or a high-efficiency test can be provided;
the pressurizing cylinder group can acquire larger oil pressure by using smaller oil pressure, and the exposed oil pipes are low-pressure pipes, so that the testing requirement is met, the equipment cost is reduced, and the device is safe and reliable;
The movable driving piece adopts a bidirectional hydraulic cylinder, has a simple structure, provides flexible driving force, reduces vibration of the test equipment, and acquires more real test data;
the heat dissipation sleeve is arranged, so that the heat dissipation sleeve has a heat dissipation function and can provide stable test temperature for a test environment.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model.
Wherein:
FIG. 1 is an isometric view I of a high pressure test apparatus for a piston rod seal;
FIG. 2 is a second isometric view of a high pressure test apparatus for a piston rod seal;
FIG. 3 is a front view of a high pressure test apparatus of a piston rod seal;
FIG. 4 is a top view of a high pressure test apparatus for a piston rod seal;
FIG. 5 is a cross-sectional view I of a high pressure test apparatus for a piston rod seal; (at A-A with respect to FIG. 4)
FIG. 6 is a second cross-sectional view of a high pressure test apparatus for a piston rod seal; (at B-B with respect to FIG. 3)
FIG. 7 is an enlarged partial view of a high pressure test apparatus of the piston rod seal; (at C with respect to FIG. 5)
The identifiers in fig. 1 to 7 are respectively: test cylinder group 1, test cylinder 11, cylinder body 111, mount 1111, exhaust hole 1112, end cap 112, annular groove 1121 for part to be tested, pressure hole 1122, annular groove 1123 for sealing part, mount groove 1124, insert ring 1125, annular seal groove 1126, rod 12, pressure cylinder group 2, pressure cylinder 21, pressure chamber 211, pressure hole 2111, high pressure chamber 212, fuel filler 2121, piston rod 22, piston 221, movement driver 3, bidirectional hydraulic cylinder 31, connecting rod 32, and heat dissipation sleeve 4.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear and obvious, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Referring to fig. 1 to 7, a high pressure testing apparatus for a piston rod sealing member includes a testing cylinder group 1, a pressurizing cylinder group 2, and a moving driving member 3, wherein,
The test cylinder group 1 comprises a test cylinder 11, a pressure gauge and a rod 12. The test cartridge 11 includes a cartridge body 111 and an end cap 112, and the cartridge body 111 and the end cap 112 enclose a closed space.
The end cover 112 is provided with a shaft hole, the inner wall of the shaft hole is sequentially provided with an annular groove 1121 of a to-be-detected piece, a pressure measuring hole 1122 and an annular groove 1123 of a sealing piece, and the annular groove 1121 of the to-be-detected piece is close to the closed space. The pressure gauge interfaces with pressure tap 1122. The rod 12 penetrates through the two end caps 112, and a sealing element is sleeved at the sealing element annular groove 1123. In this embodiment, the two end caps 112 are provided with annular grooves 1121 for pieces to be tested, pressure taps 1122, and annular grooves 1123 for sealing pieces, and the pressure gauge and the sealing pieces are provided in two groups, that is, the testing device can test two pieces to be tested at the same time, so as to provide a comparison test or a high-efficiency test. In addition, a mounting groove 1124 surrounding the rod 12 is provided at the outer end of the end cap 112, and a dust cover is provided in the mounting groove 1124 to reduce dust from entering the closed space.
In an embodiment, an insertion ring 1125 is disposed at an inner end of the end cap 112, the insertion ring 1125 is inserted into an end of the barrel 111, and a sealing structure is disposed between the insertion ring and an inner peripheral wall of the barrel 111, thereby improving the sealing performance of the closed space. Preferably, the sealing structure comprises an annular sealing groove 1126 and a sealing ring, and since the testing environment is a high-pressure environment, a side part of the sealing element needs to be supported, so that the sealing element is prevented from being deformed and damaged under the action of high pressure, and a supporting ring is further arranged. The annular sealing groove 1126 is arranged on the periphery of the insertion ring 1125 or the inner peripheral wall of the barrel 111, the sealing ring and the supporting ring are both sleeved in the annular sealing groove 1126, and the sealing ring is positioned on one side close to the closed space.
The pressurizing cylinder group 2 communicates with the closed space and applies high pressure to the oil in the closed space.
In one embodiment, the circumference of the cylinder 111 is provided with a mounting seat 1111, and the mounting seat 1111 is provided with a through hole for communicating with the closed space. The pressurizing cylinder group 2 is mounted on the mounting seat 1111 and communicates with the closed space through a through hole. The periphery of the cylinder 111 is further provided with an upward exhaust hole 1112, the exhaust hole 1112 is provided with a plug, when hydraulic oil is added into the closed space, the plug is required to be taken out, the exhaust hole 1112 is opened, air in the closed space is discharged when the hydraulic oil is added, and when the hydraulic oil overflows from the exhaust hole 1112, the air is completely discharged, and the plug is plugged.
In one embodiment, the cylinder group 2 includes a cylinder 21 and a piston rod 22. The pressurizing cylinder is provided with a pressurizing cavity 211 and a high-pressure cavity 212 which are coaxial, the output end of the high-pressure cavity 212 is communicated with the closed space, and the diameter of the high-pressure cavity is smaller than that of the pressurizing cavity 211. One end of the piston rod 22 is inserted into the pressurizing chamber 211 and extends into the high-pressure chamber 212. The middle part of the piston rod 22 is provided with a piston 221, the piston 221 reciprocates in a pressurizing cavity 211, and the pressurizing cavity 211 is provided with pressurizing holes 2111 at two ends of the piston 221, so that the pressurizing cavity 211 and the piston rod 22 form a bidirectional hydraulic cylinder. The piston rod 22 is sealed with the ends of the pressurizing cavity 211 and the high-pressure cavity 212. When the piston rod 22 is further inserted into the pressurizing cavity 211 and the high-pressure cavity 212, the end part of the piston rod 22 extrudes the hydraulic oil in the high-pressure cavity 212 to increase the oil pressure in the high-pressure cavity 212, and the oil pressure in the high-pressure cavity 212 is higher than that in the pressurizing cavity 211 because the diameter of the high-pressure cavity 212 is smaller than that of the pressurizing cavity 211, namely, the pressurizing cylinder group 2 provided by the utility model can acquire larger oil pressure by using smaller oil pressure to meet testing requirements. Further, the peripheral portion of the high pressure chamber 212 is provided with an oil filler 2121, and hydraulic oil can be supplied into the sealed space and the high pressure chamber 212 through the oil filler 2121.
The movable driving piece 3 is connected with the rod piece 12 to drive the rod piece to reciprocate on the test cylinder 11.
In one embodiment, the moving driving member 3 includes two bidirectional hydraulic cylinders 31 and a connecting rod 32, and the bidirectional hydraulic cylinders 31 are symmetrically disposed at two ends of the test cylinder group 1 and parallel to the rod 12. The telescopic rods of the two bidirectional hydraulic cylinders 31 are connected through the connecting rod 32 to drive the rod piece 12 to reciprocate, the structure is simple, flexible driving force is provided, vibration of test equipment is reduced, and more real test data are obtained.
Since the hydraulic oil is continuously pressurized and depressurized during the test, and the rod 12 moves back and forth to generate high temperature, a heat dissipation member is also required, so in other embodiments, the test apparatus further includes a heat dissipation sleeve 4, and the heat dissipation sleeve 4 is wrapped around the cylinder body 111 of the test cylinder 11 to form a heat dissipation cavity. At least two cooling liquid circulation holes are formed in the periphery of the cooling sleeve 4, and the cooling liquid circulation holes are communicated with the cooling cavity. When the temperature of the test cylinder group 1 is higher, a heat dissipation function can be provided for the test cylinder group 1 through low-temperature liquid or gas which circularly flows, and when a test piece is required to be tested at a high temperature or a certain set temperature, the temperature control can be realized through the heat dissipation sleeve 4.
In use, the part to be measured is mounted in the annular groove 1121 of the end cap 112, and at this time, the part to be measured corresponds to a seal formed between the pressure tap 1122 and the closed space. The pressurizing cylinder group 2 and the movable driving piece 3 are started, high pressure is applied to the closed space and the piece to be tested, and the rod piece 12 is driven, so that the rod piece 12 and the piece to be tested have relative movement, and testing conditions of the piece to be tested are achieved.
In the test, there are various options, the sealed space can be kept at a fixed hydraulic pressure through the pressurizing cylinder group 2, a test environment for pressurizing and depressurizing cycle reciprocation can also be provided, and the relative movement test condition under the high-pressure environment can be provided by moving the driving piece 3 in cooperation with the pressurizing cylinder group 2. By matching with the heat dissipation sleeve 4, the test of the to-be-tested piece at a certain temperature can be realized, and the test condition is flexible and controllable. In addition, the end caps 112 and the rod members 12 of the corresponding specifications may also be replaced for different sizes of pieces to be tested.
When the piece to be tested is damaged or the sealing effect is poor during testing, hydraulic oil in the sealing space passes through a gap at the periphery of the piece to be tested and enters the pressure measuring holes 1122, and a tester can check the pressure relief condition through the pressure gauge.
According to the utility model, the rod piece 12 penetrates through the closed space, so that the hydraulic pressure born by the rod piece 12 is balanced, and the high-pressure environment in the closed space does not form resistance to the back and forth movement of the rod piece 12, so that the power and the electricity consumption of the movable driving piece 3 can be greatly reduced, and the sealing test of the piece to be tested is realized at lower cost. While the utility model has been described above with reference to the accompanying drawings, it will be apparent that the utility model is not limited to the above embodiments, but is capable of being modified or applied directly to other applications without modification, as long as various insubstantial modifications of the method concept and technical solution of the utility model are adopted, all within the scope of the utility model.
Claims (10)
1. The high-pressure testing equipment for the piston rod sealing element is characterized by comprising a testing cylinder group, a pressurizing cylinder group and a moving driving element;
The test cylinder group comprises a test cylinder, a pressure gauge and a rod piece; the testing cylinder comprises a cylinder body and an end cover, wherein a closed space is formed by the cylinder body and the end cover in a surrounding mode, the end cover is provided with a shaft hole, the inner wall of the shaft hole is sequentially provided with an annular groove of a piece to be tested, a pressure measuring hole and an annular groove of a sealing piece, and the annular groove of the piece to be tested is close to the closed space; the pressure gauge is abutted with the pressure measuring hole; the rod piece penetrates through the two end covers, and a sealing piece is sleeved at the annular groove of the sealing piece;
the pressurizing cylinder group is communicated with the closed space and applies high pressure to oil in the closed space;
the movable driving piece is connected with the rod piece to drive the rod piece to reciprocate on the test cylinder.
2. A high pressure testing device for piston rod seals according to claim 1, wherein both end caps are provided with annular grooves for the part to be tested, pressure taps and annular grooves for the seal, said pressure gauges and seals being of two sets.
3. The high pressure testing apparatus of a piston rod sealing member according to claim 1, wherein the inside end of the end cap is provided with an insert ring which is inserted into both ends of the barrel and a sealing structure is provided between the insert ring and the inner peripheral wall of the barrel.
4. A high pressure testing apparatus for a piston rod seal according to claim 3, wherein said seal structure comprises an annular seal groove, a seal ring and a support ring; the annular seal groove is arranged at the periphery of the insertion ring or the inner peripheral wall of the cylinder body, the seal ring and the support ring are both sleeved in the annular seal groove, and the seal ring is positioned at one side close to the closed space.
5. The high pressure testing apparatus of a piston rod seal of claim 1 wherein said outboard end of said end cap defines a mounting groove around the rod, said mounting groove defining a dust cap therein.
6. The high-pressure test equipment for the piston rod sealing member according to claim 1, wherein the periphery of the cylinder body is provided with a mounting seat, and the mounting seat is provided with a through hole communicated with the closed space; the pressurizing cylinder group is arranged on the mounting seat and communicated with the closed space through a through hole; the periphery of the cylinder body is also provided with an upward exhaust hole, and the exhaust hole is provided with a plug.
7. A high pressure testing apparatus for a piston rod seal according to claim 1 or 6, wherein said group of pressure cylinders comprises pressure cylinders and piston rods; the pressurizing cylinder is provided with a pressurizing cavity and a high-pressure cavity which are coaxial, the output end of the high-pressure cavity is communicated with the closed space, and the diameter of the high-pressure cavity is smaller than that of the pressurizing cavity; one end of the piston rod is inserted into the pressurizing cavity and extends into the high-pressure cavity; the middle part of the piston rod is provided with a piston, the piston moves in a pressurizing cavity in a reciprocating manner, and the pressurizing cavity is provided with pressurizing holes at two ends of the piston; and the ends of the piston rod, the pressurizing cavity and the high-pressure cavity are sealed.
8. A high pressure testing device for piston rod seals according to claim 7, wherein said high pressure chamber is provided with fuel filler holes at its periphery.
9. The high pressure test apparatus of a piston rod sealing member according to claim 1, wherein said movable driving member comprises two bidirectional hydraulic cylinders symmetrically disposed at both ends of the test cylinder group and parallel to said rod member, and a connecting rod; the telescopic rods of the two bidirectional hydraulic cylinders are connected through connecting rods to drive the rod pieces to reciprocate.
10. The high pressure testing apparatus of a piston rod seal of claim 1, further comprising a heat dissipation sleeve, said heat dissipation sleeve being wrapped around the circumference of the body of the testing cartridge to form a heat dissipation chamber; at least two cooling liquid circulation holes are arranged at the periphery of the cooling sleeve, and the cooling liquid circulation holes are communicated with the cooling cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323277076.2U CN221173780U (en) | 2023-11-30 | 2023-11-30 | High-pressure test equipment for piston rod sealing element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323277076.2U CN221173780U (en) | 2023-11-30 | 2023-11-30 | High-pressure test equipment for piston rod sealing element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221173780U true CN221173780U (en) | 2024-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323277076.2U Active CN221173780U (en) | 2023-11-30 | 2023-11-30 | High-pressure test equipment for piston rod sealing element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221173780U (en) |
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2023
- 2023-11-30 CN CN202323277076.2U patent/CN221173780U/en active Active
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