Air compressor sewage discharge device
By designing an air compressor sewage discharge device including air tank, solenoid valve tube and heat collection component, the equipment failure caused by untimely discharge of condensate water from the air compressor is solved, and automatic discharge and heating and insulation are achieved, ensuring the normal operation of the pneumatic system.
Patent Information
- Application Number
- CN202411897241.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-04-04
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
If the condensate generated by the air compressor during the working process is not discharged in time, it will cause metal rust, corrosion and icing in the pneumatic pipelines and valves, causing equipment failure.
An air compressor sewage discharge device is designed, including an air tank, a solenoid valve tube and a heat collecting assembly. The time controller controls the opening and closing of the solenoid valve tube to automatically discharge condensate inside the gas tank. The heat collecting assembly uses the heat generated by the air compressor head to conduct and store heat through the design of thermal conduction plates and heat absorption cotton, and is used to heat the insulation solenoid valve tube to prevent ice blockage.
It realizes the automatic discharge of condensate water in the gas tank regularly, reduces the labor intensity of staff, avoids equipment failures, and ensures the normal operation of the pneumatic system. Through the heating and insulation design, the ice blockage of the solenoid valve tube is avoided and the normal sewage discharge effect of the device is ensured.
Smart Images

Figure CN119755509A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of air compressor sewage discharge devices, and in particular to an air compressor sewage discharge device. Background Art
[0002] An air compressor is a device used to compress gas. In the daily production of a gas station, it is used to control the start and stop of pneumatic valves and purge equipment interfaces, valves and pipelines. It is an important part of the gas station's automatic control system.
[0003] When the air compressor is running, condensed water will accumulate at the bottom of the air tank, which needs to be manually drained every four hours. If the condensed water in the air tank is not discharged for a long time, the water vapor will follow the compressed air and gather in the pneumatic pipeline and pneumatic valve, causing metal rust. In addition, in the case of low temperatures in the north in winter, ice will form in the pneumatic pipeline and valve, forming ice blockage, which will cause pipeline obstruction and equipment failure. Therefore, an air compressor drainage device is needed to solve the above problems. Summary of the invention
[0004] The purpose of the present invention is to solve the problems raised in the above background technology.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions:
[0006] An air compressor sewage discharge device includes an air compressor device, the air compressor device includes a gas tank, two supports are symmetrically installed on both sides of the bottom end of the gas tank, the top of the gas tank is connected to a bracket, and the top of the bracket is installed with an air compressor head, a heat collecting component is arranged on the outside of the air compressor head, a solenoid valve tube is installed on the right side of the bottom end of the gas tank, and a heat preservation component is arranged on the outside of the solenoid valve tube, the heat preservation component is installed under the gas tank through a fixing component, the design of the air compressor head can facilitate the portable sewage discharge operation of the condensed water inside the gas tank, and the design of the heat collecting component can reasonably utilize the heat energy generated by the operation of the air compressor head.
[0007] Preferably, a hanging plate is connected to the right side of the support, and a slide rail is embedded in the guide groove on the side of the hanging plate. A time controller is fixedly connected to the outside of the slide rail, and the gas tank is supported by the support. The time controller is designed on the outside of the hanging plate, and the time interval can be set in advance, which is convenient for intermittent control of the autonomous opening and closing state of the solenoid valve tube and reduces the labor intensity of the staff.
[0008] Preferably, the heat collecting assembly includes a guide rail fixed to the outside of the air compressor head, a plug plate is inserted into the side of the guide rail, and the plug plate is fixed to the inner wall of the heat collecting buckle plate, a cavity is opened inside the heat collecting buckle plate, and a conduction tube is connected to the bottom end of the heat collecting buckle plate, and the end of the conduction tube is connected to the insulation assembly. The cavity setting inside the heat collecting buckle plate can conveniently store heat, so that the temperature in the cavity is increased and then conducted to the heating tube through the conduction tube, thereby controlling and changing the temperature around the solenoid valve tube, and reducing the probability of ice blockage in the solenoid valve tube.
[0009] Preferably, the two sides of the heat collecting buckle plates are connected and fixed by a connecting plate, the inner wall of the heat collecting buckle plate is connected with a heat conducting plate, and the heat conducting plate is in contact with the surface of the air compressor head, and the heat conducting plates are arranged equidistantly on the inner wall of the heat collecting buckle plate. When the air compressor head is started, the design of the heat conducting plate can better conduct heat, so that the cavity of the heat collecting buckle plate can be heated up conveniently and quickly.
[0010] Preferably, heat-absorbing cotton is fitted on the inner wall of the cavity of the heat-collecting buckle plate, and the heat-conducting plate is designed in a T-shaped structure. The heat in the cavity can be absorbed by the heat-absorbing cotton, and the heat can be kept warm at the same time to avoid rapid heat loss.
[0011] Preferably, the insulation component includes a protective plate, two side connecting blocks are symmetrically installed on the left and right sides of the protective plate, and a pipeline connected to the conduction pipe is arranged inside the side connecting block. A heating pipe is installed inside the protective plate, and the heating pipe is connected to the other end of the side connecting block pipeline. Through the surrounding design of the heating pipe, a heating area can be formed on the outside of the solenoid valve tube, thereby ensuring the continuous temperature of the solenoid valve tube and avoiding ice blockage of the solenoid valve tube.
[0012] Preferably, the left and right sides of the guard plate are symmetrically connected with inner plates, and a card shaft is embedded in the side of the inner plate through a through hole, one end of the card shaft is fixed to the inner wall of the through hole of the inner plate through a supporting spring, and the fixing component includes a fixing plate, and the card shaft is inserted into the fixing plate through a card slot, and the rebound force of the supporting spring can push the card shaft so that the card shaft can be engaged and inserted into the card slot of the fixing plate, thereby ensuring the convenience and stability of disassembly and assembly of the guard plate and meeting the use requirements of the equipment in different weather conditions.
[0013] Preferably, the end of the clamping shaft is set as a ball end, and the bottom end of the protective plate is provided with a pull-out groove compatible with the solenoid valve tube. When the inner plate is inserted into the fixed plate, the side of the fixed plate squeezes the spherical end of the clamping shaft, so that the clamping shaft can move autonomously after being subjected to force, thereby facilitating the mutual clamping operation between the clamping shaft and the fixed plate.
[0014] Preferably, an embedded shaft is inserted into the side of the fixed plate through a movable groove, and the embedded shaft and the movable groove are connected and fixed by a return spring. A pressure rod is connected to the end of the embedded shaft, and the shaft end of the pressure rod is adapted to the opening of the fixed plate slot. By pressing the pressure rod, the pressure rod can squeeze the card shaft to control the card shaft to detach from the card slot of the fixed plate, thereby ensuring the convenience of disassembly and assembly of the embedded plate.
[0015] The present invention has at least the following beneficial effects:
[0016] 1. By setting up air compressor equipment, the timed drainage operation of the condensed water inside the gas tank is realized. Compared with the traditional structure, this device is connected to the pipeline in the gas tank through the solenoid valve tube, and cooperates with the time controller through the line on the outside of the solenoid valve tube. The time controller sets the timing duration, and then controls the opening and closing of the end of the solenoid valve tube, which is convenient for automatic intermittent discharge of the condensed water inside the gas tank, thereby playing the role of drainage, reducing the labor intensity of the staff, avoiding equipment failure caused by the failure to discharge the condensed water in time, and ensuring the drainage effect in the gas tank.
[0017] 2. By setting up the heat collecting component and the heat preservation component, the opening of the solenoid valve tube can be insulated and anti-icing operation can be achieved. In the northern winter, compared with the traditional structure, this device is inserted into the guide rail through the plug-in plate, so that the heat collecting buckle plate is buckled on the surface of the air compressor head. When the air compressor head is working, the heat is generated through the heat conduction plate to the inside of the cavity of the heat collecting buckle plate, and the heat is absorbed by the heat absorbing cotton inside the heat collecting buckle plate. The heat is conducted to the heating tube through the conduction tube, thereby heating and insulating the solenoid valve tube. Continuous heat conduction can prevent the water in the solenoid valve tube from freezing, avoid ice blockage, and ensure the normal sewage discharge effect of the device.
[0018] 3. By setting up the embedded plate, the clamping shaft and the fixed component, the portable disassembly and assembly of the guard plate can be realized. Compared with the traditional structure, by pressing the pressure rod, the pressure rod drives the embedded shaft to move in the through hole of the fixed plate. After the pressure rod is subjected to force, the clamping shaft can be squeezed, so that the support spring will be compressed during the movement of the clamping shaft, and then the clamping shaft will be separated from the clamping groove of the fixed plate, so that it is convenient to pull down and remove the guard plate. The guard plate can be disassembled and assembled independently as the weather temperature changes. At the same time, the heating tube design on the inner wall of the guard plate is also convenient for the staff to perform maintenance operations on the heating tube. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.
[0020] Figure 1This is a schematic diagram of the external structure of an air compressor sewage discharge device proposed by the present invention;
[0021] Figure 2 A schematic diagram of the three-dimensional structure of an air compressor device in an air compressor sewage discharge device proposed by the present invention;
[0022] Figure 3 It is a schematic diagram of the partial disassembly structure of an air compressor device in an air compressor sewage discharge device proposed by the present invention;
[0023] Figure 4 This is a three-dimensional disassembled structural schematic diagram of a heat collecting assembly in an air compressor sewage discharge device proposed by the present invention;
[0024] Figure 5 This is a schematic diagram of the partial disassembly structure of a heat collecting assembly in an air compressor sewage discharge device proposed by the present invention;
[0025] Figure 6 This is a three-dimensional disassembled structural schematic diagram of a heat preservation component in an air compressor sewage discharge device proposed by the present invention;
[0026] Figure 7 This is a schematic diagram of the disassembled structure of the connection state of the heat preservation component and the fixed component in the air compressor sewage discharge device proposed by the present invention;
[0027] Figure 8 The present invention is a schematic diagram of the three-dimensional disassembled structure of a fixed component in an air compressor sewage discharge device proposed by the present invention.
[0028] In the figure: 1. air compressor equipment; 11. gas tank; 12. bracket; 13. air compressor head; 14. support; 15. hanging plate; 16. time controller; 17. solenoid valve tube; 18. slide rail; 2. heat collecting component; 21. guide rail; 22. plug-in plate; 23. heat collecting buckle plate; 24. connecting plate; 25. heat conducting plate; 26. heat absorbing cotton; 27. conduction pipe; 3. insulation component; 31. protective plate; 32. side connection block; 33. heating tube; 34. embedded plate; 35. support spring; 36. clamping shaft; 4. fixing component; 41. fixing plate; 42. return spring; 43. embedded shaft; 44. pressure rod. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0030] Reference Figure 1-8A sewage discharge device for an air compressor includes an air compressor device 1, which includes a gas tank 11. Two supports 14 are symmetrically installed on both sides of the bottom end of the gas tank 11. A bracket 12 is connected to the top of the gas tank 11, and an air compressor head 13 is installed on the top of the bracket 12. A heat collecting component 2 is arranged on the outside of the air compressor head 13. A solenoid valve tube 17 is installed on the right side of the bottom end of the gas tank 11, and an insulation component 3 is arranged on the outside of the solenoid valve tube 17. The insulation component 3 is installed below the gas tank 11 through a fixing component 4.
[0031] A hanging plate 15 is connected to the right side of the support 14 , and a slide rail 18 is inserted into the guide groove on the side of the hanging plate 15 , and a time controller 16 is fixedly connected to the outer side of the slide rail 18 .
[0032] The heat collecting assembly 2 includes a guide rail 21 fixed on the outside of the air compressor head 13, an insert plate 22 is inserted on the side of the guide rail 21, and the insert plate 22 is fixed to the inner wall of the heat collecting buckle plate 23, a cavity is opened inside the heat collecting buckle plate 23, and a conduction pipe 27 is connected to the bottom end of the heat collecting buckle plate 23, and the end of the conduction pipe 27 is connected to the insulation assembly 3.
[0033] The sides of the two heat collecting buckle plates 23 are connected and fixed by a connecting plate 24 . The inner wall of the heat collecting buckle plate 23 is connected with a heat conducting plate 25 , and the heat conducting plate 25 abuts against the surface of the air compressor head 13 .
[0034] The inner wall of the cavity of the heat collecting buckle plate 23 is fitted with heat absorbing cotton 26, and the heat conducting plate 25 is designed in a T-shaped structure.
[0035] The insulation component 3 includes a protective plate 31, and two side connecting blocks 32 are symmetrically installed on the left and right sides of the protective plate 31, and a pipeline connected to the conduction pipe 27 is arranged inside the side connecting block 32. A heating pipe 33 is installed inside the protective plate 31, and the heating pipe 33 is connected to the other end of the pipeline of the side connecting block 32.
[0036] The left and right sides of the guard plate 31 are symmetrically connected with an inner plate 34, and a clamping shaft 36 is inserted into the side of the inner plate 34 through a through hole. One end of the clamping shaft 36 is fixed to the inner wall of the through hole of the inner plate 34 through a supporting spring 35. The fixing component 4 includes a fixing plate 41, and the clamping shaft 36 is inserted into the inside of the fixing plate 41 through a clamping groove.
[0037] The end of the clamping shaft 36 is in the form of a ball end, and the bottom end of the protective disc 31 is provided with a drawing groove adapted to the electromagnetic valve tube 17 .
[0038] An embedded shaft 43 is inserted into the side of the fixed plate 41 through the movable groove, and the embedded shaft 43 and the movable groove are connected and fixed by a return spring 42. A pressure rod 44 is connected to the end of the embedded shaft 43, and the shaft end of the pressure rod 44 is adapted to the slot opening of the fixed plate 41.
[0039] The design of the air compressor head 13 can facilitate the portable drainage operation of the condensed water inside the gas tank 11. The design of the heat collecting component 2 can make reasonable use of the heat energy generated by the operation of the air compressor head 13. While reducing costs, the problem of the solenoid valve tube 17 freezing in the northern winter is improved and solved. The gas tank 11 is supported by the support 14. The time controller 16 on the outside of the hanging plate 15 can set the time interval in advance, which is convenient for intermittently controlling the autonomous opening and closing state of the solenoid valve tube 17, reducing the labor intensity of the staff, and avoiding the solenoid valve tube 17 from being frozen due to negligence of the staff. 7 Ice blockage occurs, causing the gas tank 11 to malfunction. When the time controller 16 is installed, it can be installed from the side of the hanging plate 15 through the slide rail 18 to ensure the convenience of installation of the time controller 16. When the heat collecting buckle plate 23 is installed, the plug plate 22 can be inserted from the guide rail 21 to ensure the convenience of installation of the heat collecting buckle plate 23. The cavity setting inside the heat collecting buckle plate 23 can conveniently store heat, so that the temperature in the cavity is increased and then transferred to the heating tube 33 through the conduction tube 27, thereby controlling and changing the temperature around the electromagnetic valve tube 17, and reducing the probability of ice blockage in the electromagnetic valve tube 17.
[0040] Heat is absorbed by the heat-absorbing cotton 26 inside the heat-collecting buckle plate 23, and the heat is conducted to the heating tube 33 through the conduction tube 27, so that the solenoid valve tube 17 is heated and insulated. Continuous heat conduction can prevent the water in the solenoid valve tube 17 from freezing and ice blockage, thereby ensuring the normal sewage discharge effect of the device.
[0041] The left and right heat collecting buckle plates 23 are connected by the connecting plate 24, so that the two heat collecting buckle plates 23 can be pulled and moved synchronously, ensuring the convenience of installation of the heat collecting buckle plates 23. Heat conducting plates 25 are equidistantly arranged on the inner wall of the heat collecting buckle plates 23. When the air compressor head 13 is started, the design of the heat conducting plates 25 can better conduct heat, and the cavity of the heat collecting buckle plates 23 can be quickly heated up. The heat in the cavity can be absorbed by the heat absorbing cotton 26, and the heat can be kept warm at the same time to avoid rapid heat loss. The T-shaped structural design of the plug plate 22 can ensure the stability of the heat collecting buckle plate 23 after installation. The end of the conduction pipe 27 is connected to the pipeline of the side connecting block 32. The hot air flow can enter the interior of the heating pipe 33 through the pipeline of the side connecting block 32. The surrounding design of the heating pipe 33 can form a heating area on the outside of the solenoid valve pipe 17, thereby ensuring the continuous temperature of the solenoid valve pipe 17 and avoiding ice blockage of the solenoid valve pipe 17.
[0042] When installing the guard plate 31, the rebound force of the support spring 35 can push the clamping shaft 36 so that the clamping shaft 36 can be engaged and inserted into the clamping groove of the fixing plate 41, ensuring the convenience and stability of the disassembly and assembly of the guard plate 31, which can meet the use requirements of the equipment in different weather conditions and ensure the normal operation of the air compressor equipment 1. The ball end of the end of the clamping shaft 36 can be set so that when the embedded plate 34 is inserted into the fixing plate 41, the side of the fixing plate 41 can squeeze the spherical end of the clamping shaft 36, so that the clamping shaft 36 can move independently after being subjected to force, which is convenient for the mutual engagement operation between the clamping shaft 36 and the fixing plate 41. The pull-out operation design at the bottom end of the guard plate 31 is convenient for positioning the installation direction of the guard plate 31, and at the same time, it is prevented from colliding and engaging with the valve end of the solenoid valve tube 17 during pulling.
[0043] When it is necessary to disassemble the inner panel 34, the pressure rod 44 can be pressed to squeeze the card shaft 36, and the card shaft 36 can be controlled to disengage from the card slot of the fixed plate 41, thereby ensuring the convenience of disassembly and assembly of the inner panel 34. At the same time, the elastic force of the return spring 42 supports the inner panel 43 under normal conditions, so that the pressure rod 44 can be located at the opening position of the card slot on the side of the fixed plate 41. By pressing the pressure rod 44, the pressure rod 44 drives the inner panel 43 to move in the through hole of the fixed plate 41. After the pressure rod 44 is subjected to force, it can squeeze the card shaft 36, so that the card shaft 36 will compress the supporting spring 35 during movement, and then cause the card shaft 36 to disengage from the card slot of the fixed plate 41, thereby facilitating the pull-down and removal of the guard plate 31. The guard plate 31 can be disassembled and assembled independently as the weather temperature changes. At the same time, the design of the heating pipe 33 on the inner wall of the guard plate 31 is also convenient for the staff to perform maintenance operations on the heating pipe 33.
[0044] Working principle: According to the attached Figure 4 With attached Figure 5 As shown, when used in the north in winter, the plug plate 22 can be inserted into the guide rail 21, so that the heat collecting buckle plate 23 and the connecting plate 24 are buckled on one side of the air compressor head 13, so that the heat conducting plate 25 is in contact with the surface of the air compressor head 13. At this time, the protective plate 31 is buckled on the outside of the solenoid valve tube 17. Figure 7 With attached Figure 8 As shown, the embedded plate 34 can be inserted into the fixed plate 41, and the clamping shaft 36 can be supported by the elastic force of the support spring 35, so that the clamping shaft 36 can be moved and inserted into the clamping groove of the fixed plate 41. When the air compressor head 13 is started, the heat generated by the air compressor head 13 during operation is conducted to the cavity in the heat collecting buckle plate 23 through the heat conducting plate 25, and the heat absorbing cotton 26 can absorb the heat and store it to a certain extent in the cavity. The hot air flow is conducted to the heating tube 33 through the conduction tube 27, and the heat flow in the heating tube 33 can heat and keep the solenoid valve tube 17 warm to avoid the outlet freezing.
[0045] Secondly, according to the attached Figure 7 With attached Figure 8 As shown, when the weather temperature rises, the pressure rod 44 can be pressed to make the pressure rod 44 drive the embedded shaft 43 to move in the side through hole of the fixed plate 41. The movement of the embedded shaft 43 can compress the return spring 42, so that the pressure rod 44 compresses the clamping shaft 36. The clamping shaft 36 can be compressed by the force to support the spring 35, and then the clamping shaft 36 can be separated from the clamping groove of the fixed plate 41, so as to ensure the portable disassembly and assembly of the protective plate 31. When working, the slide rail 18 is inserted sideways so that the slide rail 18 is inserted into the hanging plate 15. The duration of opening and closing the solenoid valve tube 17 is set by the time controller 16. When the time is up, the pipeline of the solenoid valve tube 17 is opened, so as to facilitate the timely discharge of sewage from the gas tank 11.
[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.
Claims
1. An air compressor sewage discharge device, comprising an air compressor device (1), wherein the air compressor device (1) comprises a gas tank (11), two supports (14) are symmetrically mounted on both sides of the bottom of the gas tank (11), a bracket (12) is connected to the top of the gas tank (11), and an air compressor head (13) is mounted on the top of the bracket (12), characterized in that: A heat collecting component (2) is arranged on the outside of the air compressor head (13), a solenoid valve tube (17) is installed on the right side of the bottom end of the gas tank (11), and a heat preservation component (3) is arranged on the outside of the solenoid valve tube (17), and the heat preservation component (3) is installed below the gas tank (11) through a fixing component (4).
2. The air compressor sewage discharge device according to claim 1, characterized in that: The right side of the support (14) is connected to a hanging plate (15), and a slide rail (18) is inserted into a guide groove on the side of the hanging plate (15), and a time controller (16) is fixedly connected to the outside of the slide rail (18).
3. The air compressor sewage discharge device according to claim 1, characterized in that: The heat collecting assembly (2) comprises a guide rail (21) fixed on the outside of the air compressor head (13), a plug plate (22) is inserted on the side of the guide rail (21), and the plug plate (22) is fixed on the inner wall of the heat collecting buckle plate (23), a cavity is opened inside the heat collecting buckle plate (23), and a conduction pipe (27) is connected to the bottom end of the heat collecting buckle plate (23), and the end of the conduction pipe (27) is connected to the heat insulation assembly (3).
4. The air compressor sewage discharge device according to claim 3, characterized in that: The sides of the two heat collecting buckle plates (23) are connected and fixed via a connecting plate (24); the inner wall of the heat collecting buckle plate (23) is connected with a heat conducting plate (25), and the heat conducting plate (25) abuts against the surface of the air compressor head (13).
5. The air compressor sewage discharge device according to claim 4, characterized in that: The inner wall of the cavity of the heat collecting buckle plate (23) is fitted with heat absorbing cotton (26), and the heat conducting plate (25) is designed in a T-shaped structure.
6. The air compressor sewage discharge device according to claim 1, characterized in that: The heat preservation component (3) comprises a protective plate (31), two side connection blocks (32) are symmetrically installed on the left and right sides of the protective plate (31), and a pipeline connected to the conduction pipe (27) is arranged inside the side connection block (32), and a heating pipe (33) is installed inside the protective plate (31), and the heating pipe (33) is connected to the other end of the pipeline of the side connection block (32).
7. The air compressor sewage discharge device according to claim 6, characterized in that: The left and right sides of the guard plate (31) are symmetrically connected to the inner plate (34), and a clamping shaft (36) is inserted into the side of the inner plate (34) through a through hole, and one end of the clamping shaft (36) is fixed to the inner wall of the through hole of the inner plate (34) through a supporting spring (35). The fixing component (4) includes a fixing plate (41), and the clamping shaft (36) is inserted into the fixing plate (41) through a clamping groove.
8. The air compressor sewage discharge device according to claim 7, characterized in that: The end of the clamping shaft (36) is in the form of a ball end, and the bottom end of the protective disc (31) is provided with a drawing groove adapted to the electromagnetic valve tube (17).
9. The air compressor sewage discharge device according to claim 7, characterized in that: An embedded shaft (43) is inserted into the side of the fixed plate (41) through a movable groove, and the embedded shaft (43) and the movable groove are connected and fixed via a return spring (42). A pressure rod (44) is connected to the end of the embedded shaft (43), and the shaft end of the pressure rod (44) is adapted to the slot opening of the fixed plate (41).