Proportional electro-hydraulic valve manual pressure relief device and its usage method

Abstract

The present invention discloses a proportional electro-hydraulic valve manual pressure relief device and its usage method, including: a valve body, a pushing mechanism is arranged inside the valve body, the pushing mechanism includes a rotating component, a fixed component, a connecting component, a sealing plug and four groups of limiting components, a pressure relief hole is opened at the top of the valve body, the sealing plug is matched with the pressure relief hole, the rotating component and the fixed component are both arranged inside the valve body, the connecting component and the four groups of limiting components are both arranged on the sealing plug, and the connecting component is arranged on the fixed component. By rotating the rotating rod to drive the connecting rod to rotate, the fixed rack slides on the fixed rod to squeeze the valve core. At the same time, the valve core squeezes the fixed telescopic rod and the fixed spring, and the fixed telescopic rod and the fixed spring are compressed to move the connecting cylinder and the sealing plug through pushing, and the sealing plug is separated from the pressure relief hole. At the same time, the limiting plate slides on the limiting rod and squeezes the limiting spring, which can facilitate the user to relieve pressure and ensure that the valve core has sufficient flexibility.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic multi-way valves, and particularly relates to a proportional electro-hydraulic valve manual pressure relief device and a using method thereof. Background Technique

[0002] The electro-hydraulic proportional valve is a component in which the proportional electromagnet in the valve generates corresponding actions according to the input voltage signal, causing the spool of the working valve to displace, changing the size of the valve port, and thus completing the output of pressure and flow rate proportional to the input voltage. The spool displacement can also be feedback in mechanical, hydraulic or electrical forms. Due to the advantages of various forms, easy to form various electro-hydraulic systems using electrical and computer control, high control precision, flexible installation and use, and strong anti-pollution ability of the electro-hydraulic proportional valve, its application field is increasingly broadened. The cartridge-type proportional valve and proportional multi-way valve developed and produced in recent years fully consider the use characteristics of construction machinery and have functions such as pilot control, load sensing and pressure compensation. Its appearance is of great significance to the improvement of the overall technical level of mobile hydraulic machinery, especially showing good application prospects in aspects such as electro-controlled pilot operation, wireless remote control and wired remote control operation.

[0003] In the use of the existing proportional electro-hydraulic valve manual pressure relief device, the manual pressure relief device generally follows the movement of the spool all the time, and there is frictional resistance of the sealing element, which affects the action precision of the spool. At the same time, the operation of the existing proportional electro-hydraulic valve manual pressure relief device is relatively difficult. Summary of the Invention

[0004] The purpose of the present invention is to provide a proportional electro-hydraulic valve manual pressure relief device and a using method thereof. By rotating the rotating rod to drive the connecting rod to rotate, and at the same time driving the fixed gear to rotate, through the meshing of the fixed gear and the fixed rack, the fixed rack can slide on the fixed rod to squeeze the spool. At the same time, the spool squeezes the fixed telescopic rod and the fixed spring, and the fixed telescopic rod and the fixed spring are compressed to push the connecting cylinder and the sealing plug to move, and the sealing plug is separated from the pressure relief hole. At the same time, the limiting plate slides on the limiting rod and squeezes the limiting spring, which can facilitate the user to relieve pressure and at the same time ensure sufficient flexibility of the spool. By rotating the crank, one of the bidirectional threaded rods can be rotated. Through the linkage of the connecting gears, the two bidirectional threaded rods can be rotated simultaneously, so that the connecting plate slides on the mounting rod, and at the same time drives the fixed blocks to move away from each other. At this time, the fixed blocks are separated from the fixed grooves, and the mounting springs are compressed, and the rotating rod can be released, which can facilitate the user to relieve pressure.

[0005] The technical solution adopted by the present invention is as follows: a proportional electro-hydraulic valve manual pressure relief device, comprising: a valve body, a pushing mechanism is arranged inside the valve body, the pushing mechanism includes a rotating component, a fixed component, a connecting component, a sealing plug and four groups of limiting components, a pressure relief hole is opened at the top of the valve body, the sealing plug is matched with the pressure relief hole, the rotating component and the fixed component are both arranged inside the valve body, the connecting component and the four groups of limiting components are all arranged on the sealing plug, and the connecting component is arranged on the fixed component; a fixing mechanism, the fixing mechanism includes a crank, two groups of moving components, two fixing blocks and two groups of mounting components, the crank is arranged on one of the moving components, the two fixing blocks are respectively arranged on the two moving components, and the two groups of mounting components are both arranged on the valve body, and each group of mounting components is arranged on the moving component.

[0006] Wherein, the rotating component includes a rotating rod, a connecting rod, a fixed gear and a fixed rack, the rotating rod and the connecting rod are both rotatably connected to the valve body, one end of the connecting rod is fixedly connected to the rotating rod, the fixed gear is fixedly sleeved on the outer surface of the connecting rod, the fixed rack is slidably embedded between the inner walls of the mounting groove, and the fixed rack meshes with the fixed gear.

[0007] Wherein, a mounting groove is opened at the top of the valve body, the mounting groove is communicated with the pressure relief hole, a fixed rod is fixedly connected between the inner walls of the mounting groove, and the fixed rod slidably penetrates through the fixed rack.

[0008] Wherein, the fixed component includes a valve core and a connecting spring, the valve core is slidably embedded between the inner walls of the mounting groove, the connecting spring is sleeved on one end of the valve core, and one end of the connecting spring is fixedly connected to the valve body.

[0009] Wherein, the connecting component includes a fixed telescopic rod, a fixed spring and a connecting cylinder, the connecting cylinder is fixedly connected to the bottom of the sealing plug, one end of the valve core is slidably embedded between the inner walls of the connecting cylinder, the fixed spring and the fixed telescopic rod are both fixedly connected between the valve core and the connecting cylinder, and the fixed spring is sleeved on the outer surface of the fixed telescopic rod.

[0010] Wherein, each group of limiting components includes a limiting plate, a limiting rod and a limiting spring, the limiting plate is fixedly connected to the sealing plug, the limiting rod slidably penetrates through the limiting plate, the limiting rod is fixedly connected to the valve body, the limiting spring is sleeved on the outer surface of the limiting rod, and the limiting spring is fixedly connected between the limiting plate and the valve body.

[0011] Among them, each group of the moving parts includes a connecting gear, a bidirectional threaded rod, and two connecting plates. An installation groove is formed inside the valve body. The bidirectional threaded rods are rotatably connected between the inner walls on both sides of the installation groove. One of the bidirectional threaded rods penetrates through the valve body and is fixedly connected to the hand crank. The connecting gear is fixedly sleeved on the outer surface of the bidirectional threaded rod, and the two connecting gears are driven by a toothed belt. The four connecting plates are respectively threadedly connected to the two bidirectional threaded rods, and a fixed block is fixedly connected between the two connecting plates.

[0012] Among them, each group of the installation parts includes an installation rod and two installation springs. The installation rod is fixedly connected between the inner walls of the installation groove and slidably penetrates through the two connecting plates. The two installation springs are respectively sleeved on the outer surface of the installation rod, and each installation spring is fixedly connected between the connecting plate and the valve body.

[0013] Among them, fixing grooves are formed on the outer surface of the connecting rod, and the fixing grooves are respectively matched with the two fixed blocks.

[0014] The usage method of the proportional electro-hydraulic valve manual pressure relief device includes the following steps:

[0015] Step 1. Open the limit: Rotate the hand crank to rotate one of the bidirectional threaded rods. Through the linkage of the connecting gears, the two bidirectional threaded rods rotate simultaneously, causing the connecting plates to slide on the installation rods and driving the fixed blocks to move away from each other. At this time, the fixed blocks disengage from the fixing grooves, and the installation springs are compressed.

[0016] Step 2. Open the pressure relief hole: Rotate the rotating rod to drive the connecting rod to rotate, and at the same time drive the fixed gear to rotate. Through the meshing of the fixed gear and the fixed rack, the fixed rack slides on the fixed rod. The fixed rack moves to squeeze the valve core, and at the same time the valve core squeezes the fixed telescopic rod and the fixed spring. The fixed telescopic rod and the fixed spring are compressed to push the connecting cylinder and the sealing plug to move. The sealing plug disengages from the pressure relief hole, and at the same time the limiting plate slides on the limiting rod to squeeze the limiting spring.

[0017] Step 3. Fix the position: Rotate the hand crank to rotate the bidirectional threaded rod, causing the connecting plates to slide on the installation rods and driving the fixed blocks to approach each other. At this time, the fixed blocks approach the fixing grooves, the installation springs rebound, and fix the rotating rod. After the pressure relief is completed, release the rotating rod. At this time, rotate the rotating rod to restore the fixed rack to its original state. Rotate to make the sealing plug return to its original state through the elastic force of the fixed spring and the limiting spring, and then squeeze the sealing plug to make the sealing plug fit tightly with the pressure relief hole.

[0018] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

[0019] (1) In the present invention, the rotation of the rotating rod drives the rotation of the connecting rod, and at the same time drives the rotation of the fixed gear. Through the meshing of the fixed gear and the fixed rack, the fixed rack can slide on the fixed rod to squeeze the valve core. At the same time, the valve core squeezes the fixed telescopic rod and the fixed spring, and the fixed telescopic rod and the fixed spring are compressed to push the connecting cylinder and the sealing plug to move, and the sealing plug disengages from the pressure relief hole. At the same time, the limiting plate slides on the limiting rod and squeezes the limiting spring, which facilitates the user to relieve pressure and at the same time ensures sufficient flexibility of the valve core.

[0020] (2) In the present invention, by rotating the crank, one of the bidirectional threaded rods can be rotated. Through the linkage of the connecting gears, the two bidirectional threaded rods can be rotated simultaneously, so that the connecting plate slides on the mounting rod, and at the same time drives the fixed blocks to move away from each other. At this time, the fixed blocks disengage from the fixed slots, and the mounting springs are compressed, and then the rotating rod can be released, which facilitates the user to relieve pressure. Brief Description of the Drawings

[0021] Figure 1 is the front view cross-sectional view of the present invention;

[0022] Figure 2 is the front view three-dimensional partial cross-sectional view of the present invention;

[0023] Figure 3 is the front view three-dimensional half cross-sectional view of the present invention;

[0024] Figure 4 is the top view three-dimensional cross-sectional view of the present invention;

[0025] Figure 5 is the explosion view of the pushing mechanism of the present invention;

[0026] Figure 6 is the explosion view of the fixing mechanism of the present invention.

[0027] Reference numerals in the drawings: 1, valve body; 2, pushing mechanism; 201, rotating rod; 202, fixed slot; 203, connecting rod; 204, fixed gear; 205, fixed rack; 206, fixed rod; 207, valve core; 208, fixed telescopic rod; 209, fixed spring; 210, connecting cylinder; 211, sealing plug; 212, limiting plate; 213, limiting rod; 214, limiting spring; 215, connecting spring; 3, fixing mechanism; 301, bidirectional threaded rod; 302, mounting rod; 303, mounting spring; 304, connecting plate; 305, connecting gear; 306, crank; 307, fixed block. Detailed Embodiments

[0028] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Example

[0029] Reference Figures 1-6: Proportional electro-hydraulic valve manual pressure relief device and its usage method, including: valve body 1, within which a pushing mechanism 2 is arranged. The pushing mechanism 2 includes a rotating component, a fixed component, a connecting component, a sealing plug 211 and four groups of limiting components. A pressure relief hole is opened at the top of the valve body 1, and the sealing plug 211 matches the pressure relief hole. The rotating component and the fixed component are both arranged within the valve body 1. The connecting component and the four groups of limiting components are all arranged on the sealing plug 211, and the connecting component is arranged on the fixed component. The valve body 1 is provided for installation. The arrangement of the pushing mechanism 2 can facilitate the user to manually relieve pressure. The pressure relief hole is provided for relieving pressure. The sealing plug 211 can seal the pressure relief hole. The rotating component can facilitate the user to relieve pressure. The fixed component is provided for installation. The connecting component is provided for connecting the sealing plug 211 and the fixed component. The limiting components can limit the sealing plug 211. At the same time, through the arrangement of the limiting components and the connecting component, the sealing plug can quickly return to its original state. Fixed mechanism 3, which includes a crank 306, two groups of moving components, two fixed blocks 307 and two groups of mounting components. The crank 306 is arranged on one of the moving components. The two fixed blocks 307 are respectively arranged on the two moving components. The two groups of mounting components are both arranged on the valve body 1, and each group of mounting components is arranged on the moving component. The fixed mechanism 3 can limit and fix the rotating component. The crank 306 is used for adjustment and rotation. The fixed blocks 307 can limit the rotating component. The moving components can move the fixed blocks 307. The mounting components are used for support. The rotating component includes a rotating rod 201, a connecting rod 203, a fixed gear 204 and a fixed rack 205. The rotating rod 201 and the connecting rod 203 are both rotatably connected to the valve body 1. One end of the connecting rod 203 is fixedly connected to the rotating rod 201. The fixed gear 204 is fixedly sleeved on the outer surface of the connecting rod 203. The fixed rack 205 is slidably embedded between the inner walls of the installation groove, and the fixed rack 205 meshes with the fixed gear 204. The rotating rod 201 penetrates through the valve body 1 to facilitate the user to rotate. The connecting rod 203 is used for connection and the fixed gear 204. The fixed gear 204 can move the fixed rack 205. The fixed rack 205 can push the sealing plug 211 to move. By rotating the rotating rod 201, the connecting rod 203 and the fixed gear 204 can be rotated. Through the arrangement of the fixed gear 204 and the fixed rack 205, the fixed rack 205 can be moved. An installation groove is opened at the top of the valve body 1, and the installation groove communicates with the pressure relief hole. A fixed rod 206 is fixedly connected between the inner walls of the installation groove, and the fixed rod 206 slidably penetrates through the fixed rack 205. The installation groove is used for installing the fixed rod 206. The fixed rod 206 can limit the fixed rack 205. The fixed component includes a valve core 207 and a connecting spring 215. The valve core 207 is slidably embedded between the inner walls of the installation groove, and the connecting spring 215 is sleeved on one end of the valve core 207.One end of the connecting spring 215 is fixedly connected to the valve body 1. The setting of the valve core 207 and the connecting spring 215 can ensure the moving space of the valve core 207. The connecting component includes a fixed telescopic rod 208, a fixed spring 209 and a connecting cylinder 210. The connecting cylinder 210 is fixedly connected to the bottom of the sealing plug 211. One end of the valve core 207 is slidably embedded between the inner walls of the connecting cylinder 210. Both the fixed spring 209 and the fixed telescopic rod 208 are fixedly connected between the valve core 207 and the connecting cylinder 210. The fixed spring 209 is sleeved on the outer surface of the fixed telescopic rod 208. The setting of the fixed telescopic rod 208 and the fixed spring 209 can enable the valve core 207 to move. The setting of the connecting cylinder 210 is used to install the fixed telescopic rod 208 and the fixed spring 209. At the same time, through the fixed telescopic rod 208 and the fixed spring 209, the valve core 207 can quickly return to its original state. Each group of limiting components includes a limiting plate 212, a limiting rod 213 and a limiting spring 214. The limiting plate 212 is fixedly connected to the sealing plug 211. The limiting rod 213 slidably penetrates through the limiting plate 212. The limiting rod 213 is fixedly connected to the valve body 1. The limiting spring 214 is sleeved on the outer surface of the limiting rod 213. The limiting spring 214 is fixedly connected between the limiting plate 212 and the valve body 1. The setting of the limiting plate 212 can limit the sealing plug 211. Through the setting of the limiting rod 213, the limiting plate 212 can be limited. The setting of the limiting spring 214 can enable the sealing plug 211 to quickly return to its original state.,

[0030] Refer to Figures 1-6:Each set of moving components includes a connecting gear 305, a bidirectional threaded rod 301, and two connecting plates 304. An installation groove is formed inside the valve body 1. The bidirectional threaded rod 301 is rotatably connected between the inner walls on both sides of the installation groove. One of the bidirectional threaded rods 301 penetrates through the valve body 1 and is fixedly connected to the crank 306. The connecting gear 305 is fixedly sleeved on the outer surface of the bidirectional threaded rod 301, and the two connecting gears 305 are driven by a toothed belt. The four connecting plates 304 are respectively threadedly connected to the two bidirectional threaded rods 301. A fixed block 307 is fixedly connected between the two connecting plates 304. The connecting gear 305 is provided for transmission. Opposite threads are provided on the outer surface of the bidirectional threaded rod 301, and the connecting plates 304 are respectively located on the two opposite threads. By rotating the crank 306, one of the bidirectional threaded rods 301 can be driven to rotate, thereby driving the connecting gear 305 to rotate, thereby driving the other bidirectional threaded rod 301 to rotate, so that the connecting plates 304 approach or move away from each other. Each set of installation components includes an installation rod 302 and two installation springs 303. The installation rod 302 is fixedly connected between the inner walls of the installation groove, and the installation rod 302 slidably penetrates through the two connecting plates 304. The two installation springs 303 are respectively sleeved on the outer surface of the installation rod 302, and each installation spring 303 is fixedly connected between the connecting plate 304 and the valve body 1. The installation rod 302 can limit the connecting plate 304, and the installation spring 303 increases the stability of the movement of the connecting plate 304. Fixing grooves 202 are formed on the outer surface of the connecting rod 203, and the fixing grooves 202 are respectively matched with the two fixed blocks 307.

[0031] The following is a detailed description of the usage method of the proportional electro-hydraulic valve manual pressure relief device and its usage method provided by the embodiments of the present invention. The usage method includes the following steps: Step 1, open the limit: Rotate the crank 306 to rotate one of the bidirectional threaded rods 301. Through the linkage of the connecting gear 305, the two bidirectional threaded rods 301 rotate simultaneously, causing the connecting plate 304 to slide on the mounting rod 302, and at the same time driving the fixing blocks 307 to move away from each other. At this time, the fixing blocks 307 disengage from the fixing grooves 202, and the mounting springs 303 are compressed; Step 2, open the pressure relief hole: Rotate the rotating rod 201 to drive the connecting rod 203 to rotate, and at the same time drive the fixed gear 204 to rotate. Through the meshing of the fixed gear 204 and the fixed rack 205, the fixed rack 205 slides on the fixed rod 206. The fixed rack 205 moves to squeeze the valve core 207. At the same time, the valve core 207 squeezes the fixed telescopic rod 208 and the fixed spring 209, and the fixed telescopic rod 208 and the fixed spring 209 are compressed. By pushing the connecting cylinder 210 and the sealing plug 211 to move, the sealing plug 211 disengages from the pressure relief hole. At the same time, the limiting plate 212 slides on the limiting rod 213, squeezing the limiting spring 214; Step 3, fix the position: Rotate the crank 306 to rotate the bidirectional threaded rod 301, causing the connecting plate 304 to slide on the mounting rod 302, and at the same time driving the fixing blocks 307 to approach each other. At this time, the fixing blocks 307 approach the fixing grooves 202, and the mounting springs 303 rebound, and fix the rotating rod 201. After the pressure relief is completed, then release the rotating rod 201. At this time, rotate the rotating rod 201 to restore the fixed rack 205 to its original state. Rotate to make the sealing plug 211 restore its original state through the elastic force of the fixed spring 209 and the limiting spring 214, and then squeeze the sealing plug 211 to make the sealing plug 211 fit tightly with the pressure relief hole.

[0032] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. Proportional electro-hydraulic valve manual pressure relief device, characterized in that, Comprising: A valve body (1), within which a pushing mechanism (2) is provided. The pushing mechanism (2) includes a rotating member, a fixed member, a connecting member, a sealing plug (211), and four groups of limiting members. A pressure relief hole is provided at the top of the valve body (1), and the sealing plug (211) is matched with the pressure relief hole. The rotating member and the fixed member are both arranged within the valve body (1), the connecting member and the four groups of limiting members are both arranged on the sealing plug (211), and the connecting member is arranged on the fixed member; A fixing mechanism (3), which includes a crank (306), two groups of moving members, two fixing blocks (307), and two groups of mounting members. The crank (306) is arranged on one of the moving members, the two fixing blocks (307) are respectively arranged on the two moving members, the two groups of mounting members are both arranged on the valve body (1), and each group of mounting members is arranged on the moving member; Each group of limiting members includes a limiting plate (212), a limiting rod (213), and a limiting spring (214). The limiting plate (212) is fixedly connected to the sealing plug (211), the limiting rod (213) slidably penetrates through the limiting plate (212), the limiting rod (213) is fixedly connected to the valve body (1), the limiting spring (214) is sleeved on the outer surface of the limiting rod (213), and the limiting spring (214) is fixedly connected between the limiting plate (212) and the valve body (1); Each group of moving members includes a connecting gear (305), a bidirectional threaded rod (301), and two connecting plates (304). An installation groove is provided inside the valve body (1), the bidirectional threaded rod (301) is rotatably connected between the inner walls on both sides of the installation groove, one of the bidirectional threaded rods (301) penetrates through the valve body (1) and is fixedly connected to the crank (306), the connecting gear (305) is fixedly sleeved on the outer surface of the bidirectional threaded rod (301), and the two connecting gears (305) are driven by a toothed belt. The four connecting plates (304) are respectively threadedly connected to the two bidirectional threaded rods (301), and the fixing block (307) is fixedly connected between the two connecting plates (304); Each group of mounting members includes a mounting rod (302) and two mounting springs (303). The mounting rod (302) is fixedly connected between the inner walls of the installation groove, and the mounting rod (302) slidably penetrates through the two connecting plates (304). The two mounting springs (303) are respectively sleeved on the outer surface of the mounting rod (302), and each mounting spring (303) is fixedly connected between the connecting plate (304) and the valve body (1).

2. The manual pressure relief device for a proportional electro-hydraulic valve according to claim 1, characterized in that: The rotating member includes a rotating rod (201), a connecting rod (203), a fixed gear (204) and a fixed rack (205). The rotating rod (201) and the connecting rod (203) are both rotatably connected to the valve body (1). One end of the connecting rod (203) is fixedly connected to the rotating rod (201). The fixed gear (204) is fixedly sleeved on the outer surface of the connecting rod (203). The fixed rack (205) is slidably embedded between the inner walls of the installation groove, and the fixed rack (205) meshes with the fixed gear (204).

3. The manual pressure relief device of the proportional electro-hydraulic valve according to claim 2, characterized in that: An installation groove is formed at the top of the valve body (1). The installation groove communicates with the pressure relief hole. A fixed rod (206) is fixedly connected between the inner walls of the installation groove, and the fixed rod (206) slidably penetrates through the fixed rack (205).

4. The manual pressure relief device of the proportional electro-hydraulic valve according to claim 3, characterized in that: The fixing member includes a valve core (207) and a connecting spring (215). The valve core (207) is slidably embedded between the inner walls of the installation groove. The connecting spring (215) is sleeved on one end of the valve core (207), and one end of the connecting spring (215) is fixedly connected to the valve body (1).

5. The manual pressure relief device of the proportional electro-hydraulic valve according to claim 4, characterized in that: The connecting member includes a fixed telescopic rod (208), a fixed spring (209) and a connecting cylinder (210). The connecting cylinder (210) is fixedly connected to the bottom of the sealing plug (211). One end of the valve core (207) is slidably embedded between the inner walls of the connecting cylinder (210). The fixed spring (209) and the fixed telescopic rod (208) are both fixedly connected between the valve core (207) and the connecting cylinder (210). The fixed spring (209) is sleeved on the outer surface of the fixed telescopic rod (208).

6. The manual pressure relief device for the proportional electro-hydraulic valve according to claim 5, characterized in that: A fixing groove (202) is formed on the outer surface of the connecting rod (203). The fixing grooves (202) are respectively matched with two fixing blocks (307).

7. Method for using the manual pressure relief device of the proportional electro-hydraulic valve, characterized in that, Applied to the proportional electro-hydraulic valve manual pressure relief device described in claim 6, it includes the following steps: S1. Open the limit: Rotate one of the bidirectional threaded rods (301) by rotating the hand crank (306). Through the linkage of the connecting gear (305), the two bidirectional threaded rods (301) rotate simultaneously, causing the connecting plate (304) to slide on the mounting rod (302), and at the same time driving the fixing blocks (307) to move away from each other. At this time, the fixing blocks (307) disengage from the fixing grooves (202), and the mounting spring (303) is compressed; S2. Open the pressure relief hole: Rotate the rotating rod (201) to drive the connecting rod (203) to rotate, and at the same time drive the fixed gear (204) to rotate. Through the meshing of the fixed gear (204) and the fixed rack (205), the fixed rack (205) slides on the fixed rod (206). The fixed rack (205) moves to squeeze the valve core (207). At the same time, the valve core (207) squeezes the fixed telescopic rod (208) and the fixed spring (209). The fixed telescopic rod (208) and the fixed spring (209) are compressed to push the connecting cylinder (210) and the sealing plug (211) to move. The sealing plug (211) disengages from the pressure relief hole. At the same time, the limiting plate (212) slides on the limiting rod (213) and squeezes the limiting spring (214). S3. Fix the position: Rotate the crank (306) to rotate the bidirectional threaded rod (301), so that the connecting plate (304) slides on the mounting rod (302), and at the same time drive the fixed blocks (307) to approach each other. At this time, the fixed blocks (307) approach the fixed groove (202), the mounting spring (303) rebounds, and fixes the rotating rod (201). After the pressure relief is completed, release the rotating rod (201). At this time, rotate the rotating rod (201) to restore the fixed rack (205) to its original state. Rotate to make the sealing plug (211) restore its original state through the elastic force of the fixed spring (209) and the limiting spring (214). Then squeeze the sealing plug (211) to make the sealing plug (211) fit tightly with the pressure relief hole.

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