CN114321530A - Oil pipe joint with explosion-proof function - Google Patents
Oil pipe joint with explosion-proof function Download PDFInfo
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- CN114321530A CN114321530A CN202011069490.2A CN202011069490A CN114321530A CN 114321530 A CN114321530 A CN 114321530A CN 202011069490 A CN202011069490 A CN 202011069490A CN 114321530 A CN114321530 A CN 114321530A
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- 239000003921 oil Substances 0.000 claims abstract description 142
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 75
- 238000007789 sealing Methods 0.000 claims description 25
- 238000004880 explosion Methods 0.000 claims description 18
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 230000006378 damage Effects 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
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Abstract
The invention relates to an oil pipe joint with an explosion-proof function, which comprises a joint shell and an elastic explosion-proof valve core, wherein the joint shell is of a tubular structure and comprises an oil cylinder joint end and an oil pipe joint end, the oil cylinder joint end is communicated with a hydraulic oil cylinder, the oil pipe joint end is communicated with a hydraulic oil pipe, a valve core mounting support plate is arranged in the oil cylinder joint end, a valve core shaft hole is arranged in the center of the valve core mounting support plate, a plurality of oil passing holes are arranged on the valve core mounting support plate on the outer ring of the valve core shaft hole, the elastic explosion-proof valve core comprises a core shaft, one end of the core shaft is arranged in the core shaft hole, an explosion-proof valve core disc is arranged at the other end of the core shaft extending out of the oil cylinder joint end, a pressure relief hole is arranged on the explosion-proof valve core disc, and the explosion-proof valve core disc is connected with the valve core mounting support plate through an elastic component, the hydraulic system has the advantages of avoiding the phenomenon that the oil pressure in the hydraulic oil cylinder is reduced too fast, causing the load to fall fast to cause safety accidents and enhancing the safety of the hydraulic system.
Description
Technical Field
The invention relates to an oil pipe joint, in particular to an oil pipe joint with an explosion-proof function, and belongs to the field of hydraulic oil pipe components.
Background
The hydraulic system uses oil as a working medium, utilizes the pressure of the oil to operate equipment of a hydraulic actuating mechanism through accessories such as a valve and the like, and realizes output by changing the pressure intensity and increasing the acting force. The hydraulic system generally comprises a hydraulic oil cylinder and a high-pressure oil pipeline, wherein hydraulic oil enters the output pressure of the hydraulic oil cylinder through the high-pressure oil pipeline and then flows back to an oil storage chamber through an oil inlet pipe and the high-pressure oil pipeline of the hydraulic oil cylinder, and the reciprocating work of a piston of the hydraulic oil cylinder is realized through the cyclic operation. Because the hydraulic system is mostly in a high-pressure state when working normally, under the condition that a hydraulic oil pipe is damaged and burst due to accidents, the oil pressure in the pipe is abnormally reduced, so that the load on the hydraulic oil cylinder rapidly drops, and safety accidents are caused.
Disclosure of Invention
The invention discloses a new scheme of an oil pipe joint with an explosion-proof function, and adopts the scheme of the oil pipe joint with an elastic explosion-proof valve core, so that the problem that the oil pressure in a hydraulic oil cylinder is reduced too fast under the condition that a hydraulic oil pipe bursts in the existing hydraulic system, and the load is dropped rapidly to cause safety accidents is solved.
The oil pipe joint with the explosion-proof function comprises a joint shell and an elastic explosion-proof valve core, wherein the joint shell is of a tubular structure, the joint shell comprises a cylinder port end and an oil pipe port end, the cylinder port end is communicated with a hydraulic cylinder, the oil pipe port end is communicated with a hydraulic oil pipe, a valve core mounting support plate is arranged in the cylinder port end, a valve core shaft hole is formed in the center of the valve core mounting support plate, a plurality of oil through holes are formed in the valve core mounting support plate on the outer ring of the valve core hole, the elastic explosion-proof valve core comprises a mandrel, one end of the mandrel is arranged in the mandrel hole, an explosion-proof valve core disc is arranged at the other end of the mandrel extending out of the cylinder port end, a pressure relief hole is formed in the explosion-proof valve core disc, the explosion-proof valve core disc is connected with the valve core mounting support plate through an elastic component, the elastic component maintains the normally open state of the explosion-proof valve core disc under the normal working condition, hydraulic pressure in the hydraulic oil pipe abnormally drops, and high-pressure oil in the hydraulic cylinder pushes the explosion-proof valve core disc to overcome the elasticity of the elastic component and compress the oil port end to tightly The closed state is formed to prevent the oil pressure in the hydraulic cylinder from dropping too quickly.
Furthermore, the end of the mandrel, of which one end extends out of the mandrel hole, is provided with an adjusting nut, the end of the other end of the mandrel is fixedly provided with an anti-explosion mandrel disc, and the width of an oil passing gap between the anti-explosion mandrel disc and the opening end face of the oil cylinder connector end is adjusted through the adjusting nut.
Furthermore, the connector shell of the scheme is of a straight pipe structure, and the middle shafts of the connector shell, the mandrel and the explosion-proof valve mandrel disc are coaxially arranged.
Furthermore, the middle part of the joint shell is provided with a raised baffle ring plate, the outer sides of the ends of the oil cylinder connector end and the oil pipe connector end are provided with external threads, the oil cylinder connector end and an oil inlet pipe of the hydraulic oil cylinder form internal and external threaded connection, and the oil pipe connector end and the hydraulic oil pipe form internal and external threaded connection.
Furthermore, the interface of the hydraulic oil pipe of the scheme is internally provided with an elastic frustum-shaped sealing nozzle which forms interference sealing fit with the frustum surface on the inner side of the interface end of the oil pipe.
Furthermore, the conical table surface on the outer side of the elastic frustum-shaped sealing nozzle is provided with a sealing convex ring along the circumferential direction, and the sealing convex ring is connected with the conical table surface on the inner side of the interface of the oil pipe interface end in a pressing and sealing manner.
The oil pipe joint with the explosion-proof function adopts an oil pipe joint scheme with the elastic explosion-proof valve core, and has the characteristics of avoiding the safety accident that the oil pressure in the hydraulic oil cylinder is reduced too fast to cause the load to drop rapidly under the condition that the hydraulic oil pipe bursts, and enhancing the safety of a hydraulic system.
Drawings
Fig. 1 is a schematic view of an example of an oil pipe joint having an explosion-proof function.
Fig. 2 is a schematic view of an elastic frustum-shaped sealing mouth.
Fig. 3 is a schematic view of a second example of an oil pipe joint having an explosion-proof function.
FIG. 4 is a schematic view of the assembly of the oil pipe joint of FIG. 3 with a hydraulic ram and a hydraulic oil pipe.
Fig. 5 is an enlarged schematic view of a portion a of fig. 4.
FIG. 6 is a schematic diagram showing an abnormal drop in oil pressure due to a hydraulic oil pipe leakage burst.
Fig. 7 is an enlarged schematic view of a portion B of fig. 6.
The hydraulic oil pipe joint comprises a joint shell 100, a cylinder joint end 110, a valve core mounting support plate 111, an oil passing hole 112, an oil pipe joint end 120, a baffle ring plate 130, a mandrel 210, an explosion-proof valve core disc 220, a pressure relief hole 221, an elastic part 230, an adjusting nut 240, a screw head 250, a hydraulic oil cylinder 300, a hydraulic oil pipe 400, an elastic frustum-shaped sealing nozzle 410 and a sealing ring 411.
Detailed Description
As shown in figure 1, the oil pipe joint with the explosion-proof function comprises a joint shell and an elastic explosion-proof valve core. The joint shell is a tubular structure and comprises an oil cylinder interface end, the hydraulic anti-explosion valve core comprises an oil pipe interface end, the oil cylinder interface end is communicated with a hydraulic oil cylinder, a valve core mounting support plate is arranged in the oil cylinder interface end, a core shaft hole is formed in the center of the valve core mounting support plate, a plurality of oil passing holes are formed in the valve core mounting support plate on the periphery of the core shaft hole, an elastic anti-explosion valve core comprises a core shaft, one end of the core shaft is arranged in the core shaft hole, an anti-explosion valve core disc is arranged at the other end of the core shaft extending out of the oil cylinder interface end, a pressure relief hole is formed in the anti-explosion valve core disc, the anti-explosion valve core disc is connected with the valve core mounting support plate through an elastic component, the elastic component maintains the normally open state of the anti-explosion valve core disc under the normal working condition state, hydraulic pressure in the hydraulic oil cylinder abnormally drops, and high-pressure oil in the hydraulic oil cylinder pushes the anti-explosion valve core disc to overcome the elasticity of the elastic component and tightly press the oil cylinder interface end to form a closed state so as to avoid the rapid drop of the oil pressure in the hydraulic oil cylinder. The connector shell of the scheme is of a straight pipe structure, and the central shafts of the connector shell, the mandrel and the explosion-proof valve mandrel disc are coaxially arranged. In order to facilitate connection, a raised baffle ring plate is arranged in the middle of the joint shell, external threads are arranged on the outer sides of the ends of the oil cylinder connector end and the oil pipe connector end, the oil cylinder connector end and an oil inlet pipe of the hydraulic oil cylinder form internal and external threaded connection, and the oil pipe connector end and a hydraulic oil pipe form internal and external threaded connection.
According to the scheme, an oil pipe joint scheme with an elastic explosion-proof valve core is adopted, when a hydraulic oil pipe is in a normal working condition state, as shown in figures 4 and 5, an explosion-proof valve core disc is kept in an opening state, and when the hydraulic oil pipe is in an abnormal state of leakage and burst, as shown in figures 6 and 7, the explosion-proof valve core disc is kept in a closing state under the high-pressure oil return effect of a hydraulic oil cylinder, and oil return can only flow back through a tiny pressure relief hole, so that the situation that the oil pressure in the hydraulic oil cylinder is reduced too fast, the oil cylinder piston is caused to return too fast to enable a load to drop rapidly, and safety accidents are caused. Simultaneously, this scheme has adopted the mode that sets up the explosion-proof case of elasticity in the pipe joint, the middle pipeline of non return throttling part has been avoided inserting alone in being equipped with, furthest has shortened oil inlet length, avoid the condition that the oil pipe that advances of overlength interferes hydraulic equipment normal work under some application scenario, and this scheme is for inserting the mode of the middle pipeline of interior non return throttling part of being equipped with alone, still have the dismouting, change, maintain convenient characteristics, the dismouting of pipeline and the operation of taking out the non return throttling part of packing into from the pipeline have been avoided, work efficiency is improved by a wide margin, the cost is reduced, the suitability of whole system has been improved.
In order to realize the function of the elastic explosion-proof valve core, the scheme also discloses the following two specific modes.
Example one
As shown in figure 1, an adjusting nut is arranged on the end of one end of the mandrel extending out of the mandrel hole, an anti-explosion valve mandrel disc is fixedly arranged on the end of the other end of the mandrel, and the width of an oil passing gap between the anti-explosion valve mandrel disc and the opening end face of the oil cylinder connector end is adjusted through the adjusting nut. The width of an oil passing gap between the anti-explosion valve core disc and the opening end face of the oil cylinder connector end can be reduced by screwing the adjusting nut, otherwise, the width is increased.
Example two
As shown in figure 3, the disassembly, maintenance and replacement of parts are convenient, the elastic part and the adjusting nut are adopted to position the explosion-proof valve core disc from two sides of the explosion-proof valve core disc, the explosion-proof valve core disc can be taken down only by dismounting the adjusting nut during disassembly, the problem that parts cannot be disassembled in a fixed mode is avoided, if the parts need to be replaced, the whole parts need to be replaced, the cost is saved, and the maintenance efficiency is improved. The anti-explosion valve core disc is characterized in that a screw head is arranged at the end, extending out of the core shaft hole, of one end of the core shaft, an anti-explosion valve core disc is sleeved at the other end of the core shaft, an adjusting nut is arranged at the other end of the core shaft outside the anti-explosion valve core disc, and the width of an oil passing gap between the anti-explosion valve core disc and the opening end face of the oil cylinder connector end is adjusted by adjusting the adjusting nut. During operation, only the adjusting nut needs to be fixed, and the screw head is twisted to realize disassembly and assembly.
In order to improve the sealing performance of the communication between the oil pipe interface end and the hydraulic oil pipe, the elastic sealing head in interference fit is adopted in the scheme, as shown in fig. 2, an elastic frustum-shaped sealing nozzle is arranged in the interface of the hydraulic oil pipe in the scheme, and the elastic frustum-shaped sealing nozzle and the frustum surface on the inner side of the interface of the oil pipe interface end form interference seal fit. Based on above scheme, in order to further strengthen sealed effect, the awl mesa in the outside of the sealed mouth of elasticity frustum form of this scheme is gone up and is encircled along circumference and is equipped with sealed bulge loop, and sealed bulge loop forms to compress tightly sealing connection with the frustum face of the interface inboard of oil pipe interface end.
The scheme discloses an oil pipe joint with an explosion-proof function, which is suitable for various occasions needing hydraulic oil pipe connection. The hydraulic explosion-proof valve and hydraulic oil pipe joint are two parts commonly used in hydraulic system, the explosion-proof valve is installed in the oil inlet of hydraulic oil cylinder, one end of the hydraulic oil pipe joint is connected with the oil inlet of hydraulic oil cylinder, and the other end is connected with high-pressure oil pipe. When the hydraulic oil cylinder is provided with heavy load, hydraulic oil pressure exists in the whole hydraulic pipeline of the oil cylinder. In this case, if the hydraulic oil pipe is broken and cracked due to various factors such as aging and friction after a long period of use, the pressure oil is discharged from the broken part, and the entire oil line is instantaneously depressurized. At the moment, the hydraulic oil cylinder still has higher pressure, and the oil pressure acts on the explosion-proof sheet of the explosion-proof valve to push the explosion-proof sheet to overcome the elasticity of a spring arranged in the explosion-proof valve, so that the explosion-proof sheet is tightly attached to the explosion-proof valve shell to form a sealing surface to prevent hydraulic oil in the oil cylinder from continuously leaking out of a damaged oil pipe in a large quantity, and only allows oil to slowly leak through a tiny pressure relief opening on the explosion-proof sheet. Therefore, the risk of injury to personnel or damage to equipment and facilities caused by rapid falling of the load on the oil cylinder due to sudden pressure relief of the whole hydraulic pipeline system can be prevented, and the safety and effectiveness of the hydraulic system in use are ensured.
This scheme combines the function of explosion-proof valve and hydraulic pressure oil pipe joint together, sets up the explosion-proof case of elasticity in oil pipe joint promptly, provides the hydraulic oil pipe joint of taking explosion-proof function, has shortened the length of hydro-cylinder interface, has reduced the hydro-cylinder that causes from this and has used the interference, has increased the application scope of this type of hydro-cylinder, simplifies simultaneously and just does benefit to the maintenance dismouting of explosion-proof case, under the prerequisite of guaranteeing safety, has improved work efficiency.
As shown in fig. 4 and 5, when the hydraulic system works, hydraulic oil sequentially enters the oil passing hole in the oil pipe joint from the hydraulic oil pipe and enters the rodless cavity of the hydraulic oil cylinder through a gap between the explosion-proof valve core disc and the sealing surface of the oil cylinder joint end, and when the hydraulic oil continuously enters the hydraulic oil cylinder, the pressure of the rodless cavity continuously increases and the thrust acting on the piston is greater than the resultant force of the load gravity and the friction force of the piston, so that the load can rise. At the moment, the oil inlet pressure of the hydraulic oil is greater than the pressure at the rodless cavity of the hydraulic oil cylinder, and the elasticity of the spring (elastic component) also acts on the explosion-proof sheet, so that the explosion-proof joint is in an opening state at the moment.
When the oil pump of the hydraulic system stops pumping oil and performs pressure relief and oil return work, hydraulic oil returns to the system oil tank from the rodless cavity of the oil cylinder through a gap between the explosion-proof valve core disc and the sealing surface of the oil cylinder connector end, the oil passing hole in the oil pipe joint and the hydraulic oil pipe in sequence. At the moment, the pressure in the rodless cavity of the oil cylinder and the pressure in the hydraulic oil pipe are basically only the pressure difference on the hydraulic pipeline, and the pressure is very small and is not enough to overcome the elastic force of the spring acting on the explosion-proof valve core disc. Therefore, the explosion-proof valve core disc in the oil pipe joint is also in an open state at the moment, and the hydraulic oil can flow back to the hydraulic system from the oil cylinder through the oil pipe joint.
As shown in fig. 6 and 7, when the hydraulic oil pipe is damaged and burst in the working state of the hydraulic oil cylinder, hydraulic oil in the high-pressure oil pipe loses pressure instantaneously, the force acting on the explosion-proof valve core disc is the acting force of the pressure in the rodless cavity of the oil cylinder on the explosion-proof valve core disc, and the acting force is far greater than the elastic force of the spring acting on the explosion-proof valve core disc. Therefore, when the hydraulic oil pipe bursts, the explosion-proof valve core disc is pushed to the sealing surface of the oil cylinder interface end under the action of oil pressure of the oil cylinder rodless cavity, a large amount of hydraulic oil is prevented from flowing out of the oil cylinder rodless cavity, only a small amount of hydraulic oil is allowed to flow out through a specially set tiny hole with the diameter of 0.6mm, the hydraulic oil cylinder can descend slowly, and personnel injury and damage to a mechanical structure caused by quick descending of the oil cylinder are avoided.
This scheme provides a take hydraulic oil pipe joint of explosion-proof function, has shortened the length of hydro-cylinder interface, has reduced the hydro-cylinder that causes from this and has used the interference, has increased the application scope of this type of hydro-cylinder, simplifies simultaneously and does benefit to the maintenance dismouting of explosion-proof case, under the prerequisite of guaranteeing safety, has improved work efficiency.
The oil pipe joint with the explosion-proof function is not limited to the disclosure in the specific embodiment, the technical solutions presented in the examples can be extended based on the understanding of the person skilled in the art, and the simple alternatives made by the person skilled in the art according to the present solution in combination with the common general knowledge also belong to the scope of the present solution.
Claims (6)
1. The oil pipe joint with the explosion-proof function is characterized by comprising a joint shell and an elastic explosion-proof valve core, wherein the joint shell is of a tubular structure and comprises an oil cylinder joint end and an oil pipe joint end, the oil cylinder joint end is communicated with a hydraulic oil cylinder, the oil pipe joint end is communicated with a hydraulic oil pipe, a valve core mounting support plate is arranged in the oil cylinder joint end, a valve core shaft hole is formed in the center of the valve core mounting support plate, and a plurality of oil passing holes are formed in the valve core mounting support plate on the outer ring of the valve core shaft hole; the elastic explosion-proof valve core comprises a mandrel, one end of the mandrel is arranged in the mandrel hole, and an explosion-proof valve core disc is arranged at the other end of the mandrel extending out of the oil cylinder port end; the explosion-proof valve core disc is provided with a pressure relief hole, the explosion-proof valve core disc is connected with the valve core mounting support plate through an elastic component, and the elastic component maintains the normally open state of the explosion-proof valve core disc under the normal working condition state; when the oil pressure in the hydraulic oil pipe abnormally drops, the high-pressure oil in the hydraulic oil cylinder pushes the explosion-proof valve core disc to overcome the elasticity of the elastic component and tightly press the oil cylinder interface end to form a closed state so as to avoid the too fast drop of the oil pressure in the hydraulic oil cylinder.
2. The oil pipe joint with the explosion-proof function according to claim 1, wherein an adjusting nut is arranged on an end of one end of the mandrel extending out of the mandrel hole, the explosion-proof mandrel disc is fixedly arranged on an end of the other end of the mandrel, and the width of an oil passing gap between the explosion-proof mandrel disc and the opening end face of the oil cylinder connector end is adjusted through the adjusting nut.
3. The anti-explosion oil pipe joint according to claim 1, wherein the joint housing is a straight pipe structure, and the central axes of the joint housing, the mandrel and the anti-explosion valve mandrel disc are coaxially arranged.
4. The oil pipe joint with the explosion-proof function according to claim 1, wherein a raised baffle ring plate is arranged in the middle of the joint housing, external threads are arranged on the outer sides of the ends of the oil cylinder joint end and the oil pipe joint end, the oil cylinder joint end and an oil inlet pipe of the hydraulic oil cylinder form internal and external threaded connection, and the oil pipe joint end and the hydraulic oil pipe form internal and external threaded connection.
5. The oil pipe joint with the explosion-proof function according to claim 1, wherein an elastic frustum-shaped sealing nozzle is arranged in the interface of the hydraulic oil pipe, and the elastic frustum-shaped sealing nozzle and the frustum surface on the inner side of the interface end of the oil pipe form interference sealing fit.
6. The oil pipe joint with the explosion-proof function as claimed in claim 1, wherein a sealing convex ring is circumferentially arranged on the conical table surface at the outer side of the elastic frustum-shaped sealing nozzle, and the sealing convex ring is in compression sealing connection with the conical table surface at the inner side of the joint of the oil pipe joint end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011069490.2A CN114321530A (en) | 2020-09-30 | 2020-09-30 | Oil pipe joint with explosion-proof function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011069490.2A CN114321530A (en) | 2020-09-30 | 2020-09-30 | Oil pipe joint with explosion-proof function |
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| Publication Number | Publication Date |
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| CN114321530A true CN114321530A (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011069490.2A Pending CN114321530A (en) | 2020-09-30 | 2020-09-30 | Oil pipe joint with explosion-proof function |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040124389A1 (en) * | 2002-12-31 | 2004-07-01 | Phillips John C. | Self-sealing male luer connector with biased valve plug |
| CN102401206A (en) * | 2010-09-13 | 2012-04-04 | 帕尔公司 | Connector assemblies, fluid systems including connector assemblies, and procedures for making fluid connections |
| CN104520628A (en) * | 2012-06-11 | 2015-04-15 | 安德烈亚斯·冯凯兹 | Low-temperature conduit coupling |
| CN106762917A (en) * | 2017-03-10 | 2017-05-31 | 湖南鸿辉科技有限公司 | A kind of big flow explosion-proof valve and method of work |
| CN211166619U (en) * | 2019-11-15 | 2020-08-04 | 柳州双吉机械股份有限公司 | Automobile hydraulic lifting tail board |
| CN212986368U (en) * | 2020-09-30 | 2021-04-16 | 上海极智机电设备有限公司 | Oil pipe joint with explosion-proof function |
-
2020
- 2020-09-30 CN CN202011069490.2A patent/CN114321530A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040124389A1 (en) * | 2002-12-31 | 2004-07-01 | Phillips John C. | Self-sealing male luer connector with biased valve plug |
| CN102401206A (en) * | 2010-09-13 | 2012-04-04 | 帕尔公司 | Connector assemblies, fluid systems including connector assemblies, and procedures for making fluid connections |
| CN104520628A (en) * | 2012-06-11 | 2015-04-15 | 安德烈亚斯·冯凯兹 | Low-temperature conduit coupling |
| CN106762917A (en) * | 2017-03-10 | 2017-05-31 | 湖南鸿辉科技有限公司 | A kind of big flow explosion-proof valve and method of work |
| CN211166619U (en) * | 2019-11-15 | 2020-08-04 | 柳州双吉机械股份有限公司 | Automobile hydraulic lifting tail board |
| CN212986368U (en) * | 2020-09-30 | 2021-04-16 | 上海极智机电设备有限公司 | Oil pipe joint with explosion-proof function |
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