Hydraulic valve with sealing detection function

Abstract

The invention relates to the field of hydraulic valves, and discloses a hydraulic valve with a sealing detection function, which comprises a three-way pipe, the three-way pipe is used for being connected with other parts of a device and being matched with arrangement and installation of other assemblies, and an auxiliary assembly is arranged at the lower end of the three-way pipe. A detection assembly is arranged at the position, located at the lower end of the three-way pipe, of the outer side of the auxiliary assembly, the detection assembly is used for detecting the sealing performance of the device, and the auxiliary assembly is used for assisting installation of the detection assembly and cooperating with the detection assembly for detection. When a worker inspects, the worker only needs to inspect the mounting box to know where the valve element is excessively abraded, if leak detection occurs, the possibility of being found can be increased by utilizing the chromatic aberration between the baffle and the surrounding environment after the baffle falls off, and the filter element can enable a medium to slowly drop, so that the medium is prevented from being quickly lost, and the probability of being found can be further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic valves, and particularly to a hydraulic valve with a seal detection function. Background Art

[0002] In the patent application with the application publication number CN112128159A, it includes a valve body, a liquid outlet pipe, a driven outer gear sleeve, a rotating inner sleeve, a sealing inner pad, a first lubricating oil brush, and a driving gear. A top groove is formed at the top of the valve body, and a valve rod is rotatably installed in the top groove. A liquid inlet pipe and a liquid outlet pipe are respectively fixedly installed on the outer walls on both sides of the valve body. Mounting inclined seats are fixedly installed at the tops of the liquid inlet pipe and the liquid outlet pipe, and a lubricating oil box is fixedly installed on the mounting inclined seats. Side shells are fixedly installed on the outsides of the liquid inlet pipe and the liquid outlet pipe. A rotating inner sleeve is rotatably installed inside the liquid outlet pipe, a driven outer gear sleeve is fixedly installed on the outside of the rotating inner sleeve, a driving gear is rotatably installed in the side shell below the driven outer gear sleeve through a mounting shaft, and a sealing inner pad is fixedly installed inside the liquid outlet pipe through a fixing frame. The advantages are as follows: In the present invention, a sealing inner pad is installed inside, and thermal expansion particles are provided in the sealing inner pad. When the hydraulic valve is in use, the hydraulic valve is directly assembled with an external structure. During the assembly, it is inevitable to squeeze and rub the sealing inner pad. At the same time, sometimes the conveyed oil has a certain temperature. These factors will cause the sealing inner pad to gradually heat up, thereby increasing the temperature of the thermal expansion particles in the sealing inner pad. As a result, the thermal expansion particles in the sealing inner pad will effectively expand, causing the volume of the sealing inner pad to expand, effectively blocking the gap at the combined connection, and thus effectively ensuring the sealing performance of the hydraulic valve.

[0003] In the prior art including the above patent, during the use process of the valve body, the valve core will gradually wear with the increase of the service time. Once the wear degree of the valve core reaches a specific value, its sealing performance will decrease. Under working conditions, the internal liquid medium will overflow from the worn part of the valve core. In the long run, it will not only interfere with the pressure stability in the device, but also cause the reduction of the internal liquid medium, ultimately affecting the working efficiency of the entire system. Based on this, most manufacturers in the current art will adopt an electronic hydraulic control and detection system. Although the sensor can accurately detect and judge the pressure change in the device, the inspection still relies on manual operation. Therefore, the existing system can only detect the entire system during operation and cannot conduct more detailed detection on a single device. Therefore, the existing technology is not convenient for the inspection workers, with a large working intensity. Moreover, most of the existing safety relief valves focus on strengthening the sealing components. Although this can extend the service life of the device to a certain extent, it cannot detect in time whether the sealing performance has decreased. At the same time, during daily use, the safety relief valve often malfunctions and opens due to non-dangerous conditions such as pressure fluctuations and vibrations, resulting in unnecessary discharge of excessive media and even causing system interruption. Summary of the Invention

[0004] The problems to be solved by the present invention are as follows: during use, it is impossible to timely know whether the sealing performance has decreased and where wear occurs inside the valve core, and it is also impossible to solve the phenomenon of accidental opening of existing safety valves.

[0005] To solve the above technical problems, the technical solution of the present invention is: a hydraulic valve with a sealing detection function, including a three-way pipe, which is used to connect other components of the device and cooperate with the openings and installations of other components. An auxiliary component is provided at the lower end of the three-way pipe, and a detection component is provided outside the auxiliary component at the lower end of the three-way pipe. The detection component is used to detect the sealing performance of the device, and the auxiliary component is used to assist the installation of the detection component and cooperate with the detection component for detection. An installation part is provided at the upper end of the three-way pipe, which is used to cooperate with the installation of components inside the device and protect parts inside it. A determination component is provided in the middle of the three-way pipe, which is used to determine whether the pressure in the system is at a dangerous value.

[0006] Preferably, the auxiliary component includes a connecting pipe. The upper end of the connecting pipe is fixedly connected to the three-way pipe. The connecting pipe is fixedly connected to the three-way pipe, and the inner diameter of the connecting pipe is the same as that of the three-way pipe. A water guide groove is provided on the upper end surface of the connecting pipe. The water guide groove near the center of the three-way pipe is in the shape of a hollow frustum of a cone, and the cross-section of the water guide groove near the outer wall of the three-way pipe is trapezoidal. A drain hole is provided on the lower end of the three-way pipe outside the connecting pipe. The drain hole is located in the trapezoidal part of the water guide groove. The water guide groove is used to guide the overflowing medium to the drain hole. A floating ring is provided above the water guide groove, and eight bumps are fixedly provided at the upper end of the water guide groove.

[0007] Preferably, the detection component includes an installation box, which is located at the lower end of the three-way pipe. There are two installation boxes in total. The installation box is made of a transparent material. The middle part of the installation box is slidably connected to the connecting pipe. A water pipe is fixedly provided at the upper end of the installation box. There are eight independent chambers in the interior of a single installation box.

[0008] Preferably, the water pipe is slidably connected to the drain hole, and the number of water pipes is the same as that of the drain holes. A rubber head is fixedly provided inside the water pipe between the two water pipes. The rubber head is in the shape of a cone. A filter element is fixedly provided at the upper end of the rubber head. A baffle is provided below the rubber head. The baffle is fixedly connected to the installation box. The baffle is in a cross shape, and a notch is provided in the middle of each of the four arms of the baffle. The notch is in an inverted triangle shape.

[0009] Preferably, the determination component includes a mounting disk, which is located between the tee and the mounting member. The cross-section of the mounting disk is T-shaped, and the middle of the mounting disk is hollow. An activity tube is slidably arranged inside the mounting disk, and a sealing head is fixedly arranged at the lower end of the activity tube.

[0010] Preferably, the middle part of the sealing head is also hollow. An activity disk is fixedly arranged at the upper end of the activity tube, and the activity disk is located above the mounting disk. A plurality of chutes are formed inside the activity disk. The chutes are convex-shaped, and a top block is slidably arranged inside the chutes.

[0011] Preferably, the length of the top block is less than the length of the chute. The top block is also convex-shaped. The lower end on the side of the top block away from the mounting disk is formed into an arc surface. Mounting blocks are arranged around the outer side of the activity disk, and the number of the mounting blocks is the same as that of the top blocks.

[0012] Preferably, the lower end of the mounting block is fixedly connected to the mounting disk. The upper end of the mounting block is formed into an inclined surface, and the upper inclined surface of the mounting block inclines towards the center of the mounting disk. A bolt is slidably arranged inside the mounting block, and the upper end on the side of the bolt close to the top block is formed into an inclined surface.

[0013] Preferably, a spring is fixedly arranged on a part of the upper end of the bolt located inside the mounting block, and the other end of the spring is fixedly connected to the mounting block. A clamping plate is fixedly arranged at the lower end inside the sealing head.

[0014] Preferably, the clamping plate consists of two upper and lower parts, and the two clamping plates are connected by a telescopic rod. The upper clamping plate is fixedly connected to the sealing head, and the lower clamping plate is slidably connected to the sealing head. A sealing ring is arranged between the two clamping plates, and the height of the sealing ring is less than the height between the two clamping plates.

[0015] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0016] (1) By setting up the auxiliary component and the detection component, when the sealing performance of the sealing head deteriorates, the medium will flow into the transparent mounting box. In this way, when the worker conducts a patrol inspection through the hydraulic detection system and learns of abnormal pressure, they only need to directly check the mounting box to determine the degree of damage to the valve core, and can roughly locate the worn area without disassembling the machine. Thus, it is more convenient to maintain the valve core after disassembly, effectively preventing the system from malfunctioning due to too low pressure or medium loss. In addition, the floating ring located above the water guide groove can prevent the medium from directly flowing into the mounting box when the safety valve relieves pressure, avoiding misjudgment by the worker and improving the reliability of detection to a certain extent. At the same time, the rubber head, filter element, and baffle cooperate with each other, not only preventing the internal medium from directly leaking to the outside, but also when the patrol inspection is missed, as the medium in the mounting box increases, it will break the baffle and cause it to fall. Using the color difference between the baffle and the surrounding environment increases the possibility of being discovered. The filter element can prevent outside air carrying dust from entering the system when the medium in the mounting box is not full; when the mounting box is full of medium, it can make the medium drip slowly, which not only avoids the rapid loss of the medium but also cooperates with the fallen baffle to further increase the probability of being discovered, thus providing strong support for ensuring the service life of the valve body and the working stability of the entire system;

[0017] (2) Under the action of the determination component, when the pressure in the system increases, it can be determined whether this pressure increase is due to a non-emergency pressure increase caused by system or machine switching or mechanical vibration during operation, or an emergency pressure increase caused by a system failure. This can not only avoid excessive loss of the medium caused by the mis-opening of the safety valve but also assist the detection component in detection to prevent a small amount of overflowing medium from entering the detection component when mis-opening occurs. Description of the Drawings

[0018] Figure 1 Overall three-dimensional schematic diagram of the present invention;

[0019] Figure 2 Cross-sectional structure schematic diagram of the device of the present invention;

[0020] Figure 3 Internal structure schematic diagram of the auxiliary component of the present invention;

[0021] Figure 4 Three-dimensional schematic diagram of the detection component of the present invention;

[0022] Figure 5 Partial cross-sectional schematic diagram of the mounting box of the present invention;

[0023] Figure 6 Bottom view schematic diagram of the mounting box of the present invention;

[0024] Figure 7 Cross-sectional structure schematic diagram of the determination component of the present invention;

[0025] Figure 8 For the present invention Figure 7 Enlarged schematic view of location A in the present invention;

[0026] Figure 9 Cross-sectional structure schematic diagram of the mounting block of the present invention;

[0027] Figure 10 Schematic diagram of the sealing ring and clamping plate of the present invention.

[0028] In the figure: 1, tee; 2, auxiliary component; 201, connecting pipe; 202, water guide groove; 203, drain hole; 3, detection component; 301, mounting box; 302, water pipe; 303, rubber head; 304, filter element; 305, baffle; 306, break; 4, mounting piece; 5, determination component; 501, mounting disc; 502, movable pipe; 503, sealing head; 504, movable disc; 505, chute; 506, top block; 507, mounting block; 508, bolt; 509, spring; 510, sealing ring; 511, clamping plate. Detailed implementation manners

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are some but not all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0030] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the ordinary meanings understood by those of ordinary skill in the art to which the present disclosure pertains. The terms "including" or "comprising" and the like used in the present disclosure mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items. The terms "connected" or "coupled" and the like are not limited to physical or mechanical connections, and may also include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0031] Such as Figures 1 to 10As shown in the figure, a hydraulic valve with a seal detection function provided by the present invention includes a tee pipe 1, which is used to connect other components of the device and cooperate with the openings and installations of other components. An auxiliary component 2 is arranged at the lower end of the tee pipe 1. A detection component 3 is arranged outside the auxiliary component 2 at the lower end of the tee pipe 1. The detection component 3 is used to detect the sealing performance of the device. The auxiliary component 2 is used to assist the installation of the detection component 3 and cooperate with the detection component 3 for detection. An installation part 4 is arranged at the upper end of the tee pipe 1. The installation part 4 is used to cooperate with the installation of components in the device and protect parts inside it. A determination component 5 is arranged in the middle of the tee pipe 1. The determination component 5 is used to determine whether the pressure in the system is at a dangerous value.

[0032] The auxiliary component 2 includes a connecting pipe 201. The upper end of the connecting pipe 201 is fixedly connected to the tee pipe 1. The connecting pipe 201 is fixedly connected to the tee pipe 1. The inner diameter of the connecting pipe 201 is the same as that of the tee pipe 1. A water guide groove 202 is opened on the upper end surface of the connecting pipe 201. The water guide groove 202 near the center of the tee pipe 1 is in the shape of a hollow frustum of a cone. The cross-section of the water guide groove 202 near the outer wall of the tee pipe 1 is trapezoidal. A drain hole 203 is opened outside the connecting pipe 201 at the lower end of the tee pipe 1. The drain hole 203 is located in the trapezoidal part of the water guide groove 202. The water guide groove 202 is used to guide the overflowing medium to the drain hole 203. A floating ring is arranged above the water guide groove 202. Eight bumps are fixedly arranged at the upper end of the water guide groove 202.

[0033] The detection component 3 includes an installation box 301. The installation box 301 is located at the lower end of the tee pipe 1. There are two installation boxes 301 in total. The installation box 301 is made of a transparent material. The middle part of the installation box 301 is slidably connected to the connecting pipe 201. A water pipe 302 is fixedly arranged at the upper end of the installation box 301. A total of eight independent chambers are provided inside a single installation box 301.

[0034] The water pipe 302 is slidably connected to the drain hole 203. The number of the water pipes 302 is the same as that of the drain holes 203. A rubber head 303 is fixedly arranged inside the water pipe 302 between the two water pipes 302. The rubber head 303 is set in a conical shape. A filter element 304 is fixedly arranged at the upper end of the rubber head 303. A baffle 305 is arranged below the rubber head 303. The baffle 305 is fixedly connected to the installation box 301. The baffle 305 is arranged in a cross shape. Break openings 306 are opened in the middle of the four arms of the baffle 305. The break openings 306 are set in an inverted triangle shape. When spraying paint on the baffle 305, a more distinct color needs to be selected according to the actual environment.

[0035] The determination component 5 includes an installation disk 501, which is located between the tee 1 and the installation part 4. The cross-section of the installation disk 501 is T-shaped, and the middle of the installation disk 501 is hollow. An activity tube 502 is slidably arranged inside the installation disk 501, and a sealing head 503 is fixedly arranged at the lower end of the activity tube 502.

[0036] The middle part of the sealing head 503 is also hollow. An activity disk 504 is fixedly arranged at the upper end of the activity tube 502. The activity disk 504 is located above the installation disk 501. A number of sliding grooves 505 are formed inside the activity disk 504. The sliding grooves 505 are convex-shaped. A top block 506 is slidably arranged inside the sliding grooves 505.

[0037] The length of the top block 506 is less than the length of the sliding groove 505. The top block 506 is also convex-shaped. The lower end of the side of the top block 506 away from the installation disk 501 is formed as an arc surface. Installation blocks 507 are arranged around the outside of the activity disk 504. The number of the installation blocks 507 is the same as that of the top blocks 506.

[0038] The lower end of the installation block 507 is fixedly connected to the installation disk 501. The upper end of the installation block 507 is formed as an inclined surface. The upper inclined surface of the installation block 507 inclines towards the center of the installation disk 501. A plug 508 is slidably arranged inside the installation block 507. The upper end of the side of the plug 508 close to the top block 506 is formed as an inclined surface.

[0039] A part of the upper end of the plug 508 located inside the installation block 507 is fixedly provided with a spring 509. The other end of the spring 509 is fixedly connected to the installation block 507. A clamping plate 511 is fixedly arranged at the lower end inside the sealing head 503.

[0040] The clamping plate 511 is composed of two upper and lower parts. The clamping plates 511 are connected by a telescopic rod. The upper clamping plate 511 is fixedly connected to the sealing head 503. The lower clamping plate 511 is slidably connected to the sealing head 503. A sealing ring 510 is arranged between the clamping plates 511. The height of the sealing ring 510 is less than the height between the clamping plates 511.

[0041] Working principle and usage process of the present invention: During the use of the safety valve, the sealing head 503 will gradually wear over time. When the wear reaches a certain degree, a small amount of medium will flow out from the worn gap. After the medium flows out, it will first flow to the frustum part of the water guide groove 202, and then flow to the floating plate on one side. As the medium continuously increases, the floating plate will gradually float up. At this time, the medium will be guided by the trapezoidal part of the water guide groove 202 to the drain hole 203 and enter the installation box 301 through the water pipe 302. The medium entering the installation box 301 will remain inside it, which is convenient for direct observation during manual inspection. It should be noted that the floating plate will only float up when the medium leaks to a certain amount, and when the safety valve relieves pressure, the relatively large internal pressure will firmly press the floating plate to prevent the medium from entering the lower installation box 301;

[0042] If the medium leakage cannot be detected in time during manual inspection, the medium in the installation box 301 will gradually increase. At this time, the rubber head 303 will gradually sink downward as the medium increases until the filter element 304 abuts against the baffle 305. If the worker still does not notice at this time, as the medium in the installation box 301 continues to increase, the filter element 304 will be completely pushed out downward, thereby damaging the baffle 305, reminding the inspection worker or other workers to pay attention to the medium leakage situation through the fallen baffle 305. And it is worth mentioning that when the medium enters the installation box 301, the convex block on the water guide groove 202 can guide the medium to the drain hole 203 adjacent to the leakage point and fall into the corresponding position in the installation box 301;

[0043] When the pressure in the system reaches the set pressure for valve opening, the medium will squeeze the sealing ring 510. At this time, both sides of the sealing ring 510 cannot withstand the pressure and will warp upward by a part, enabling the medium to surge upward from both sides of it and finally enter the inside of the movable disk 504. As the pressure continuously increases, the top block 506 will be pushed outwards. When the top block 506 moves to the outermost end, the pin 508 will be completely pushed out, and the movable disk 504 is unlocked and can move upward. During this process, if the pressure change is not a dangerous situation, the medium either cannot reach the movable disk 504 or cannot completely push out the pin 508. When the pressure is at the trough, the clamping plate 511 can move downward, and the upper medium can press down the sealing ring 510 and return to the system; if the pressure change is a dangerous situation, then after the above steps are completed, the sealing head 503 will move upward to start relieving pressure.

[0044] The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present invention.

Claims

1. A hydraulic valve with a sealing detection function, comprising a three-way pipe (1), characterized in that: The three-way pipe (1) is used to connect other parts of the device and cooperate with the opening and installation of other components. The lower end of the three-way pipe (1) is provided with an auxiliary component (2). The outer side of the auxiliary component (2) is provided with a detection component (3) at the lower end of the three-way pipe (1). The detection component (3) is used to detect the sealing performance of the device. The auxiliary component (2) is used to assist the installation of the detection component (3) and cooperate with the detection component (3) to perform detection. The upper end of the three-way pipe (1) is provided with a mounting member (4). The mounting member (4) is used to cooperate with the installation of components in the device and protect the parts inside. The middle part of the three-way pipe (1) is provided with a determination component (5). The determination component (5) is used to determine whether the pressure in the system is at a dangerous value.

2. A hydraulic valve with a sealing detection function according to claim 1, characterized in that: The auxiliary component (2) comprises a connecting pipe (201), the upper end of the connecting pipe (201) is fixedly connected to the three-way pipe (1), the connecting pipe (201) is fixedly connected to the three-way pipe (1), the inner diameter of the connecting pipe (201) is consistent with the inner diameter of the three-way pipe (1), and the upper end surface of the connecting pipe (201) is provided with a water guide groove (202), the water guide groove (202) close to the center of the three-way pipe (1) is in the shape of a hollow truncated cone, and the water guide groove (202) close to the center of the three-way pipe (1) is in the shape of a hollow truncated cone. (1) The cross section of the water guide groove (202) on the outer wall is trapezoidal, the lower end of the three-way pipe (1) is located outside the connecting pipe (201) and is provided with a drainage hole (203), the drainage hole (203) is located in the trapezoidal part of the water guide groove (202), the water guide groove (202) is used to guide the overflowed medium to the drainage hole (203), a floating ring is arranged above the water guide groove (202), and eight protrusions are fixedly arranged at the upper end of the water guide groove (202).

3. The hydraulic valve with sealing detection function according to claim 1, characterized in that: The detection assembly (3) comprises an installation box (301), the installation box (301) being located at the lower end of the three-way pipe (1), and two installation boxes (301) are provided in total. The installation boxes (301) are made of a transparent material, the middle part of the installation box (301) is slidably connected to the connecting pipe (201), the upper end of the installation box (301) is fixedly provided with a water pipe (302), and the interior of a single installation box (301) is provided with eight independent chambers.

4. The hydraulic valve with sealing detection function according to claim 3, characterized in that: The water pipe (302) is slidably connected to the drainage hole (203), the number of the water pipe (302) and the number of the drainage holes (203) are the same, a rubber head (303) is fixedly arranged inside the water pipe (302) between the two water pipes (302), the rubber head (303) is arranged in a cone shape, a filter element (304) is fixedly arranged at the upper end of the rubber head (303), a baffle (305) is arranged below the rubber head (303), the baffle (305) is fixedly connected to the installation box (301), the baffle (305) is arranged in a cross shape, and the middle part of the four arms of the baffle (305) are all provided with a fracture (306), and the fracture (306) is arranged in an inverted triangle shape.

5. The hydraulic valve with sealing detection function according to claim 1, characterized in that: The determination component (5) comprises a mounting plate (501), wherein the mounting plate (501) is located between the three-way pipe (1) and the mounting member (4), wherein the cross section of the mounting plate (501) is T-shaped, and the middle of the mounting plate (501) is hollow, and a movable tube (502) is slidably arranged inside the mounting plate (501), and a sealing head (503) is fixedly arranged at the lower end of the movable tube (502).

6. The hydraulic valve with sealing detection function according to claim 5, characterized in that: The middle part of the sealing head (503) is also hollow, and a movable disk (504) is fixedly provided at the upper end of the movable tube (502). The movable disk (504) is located above the mounting disk (501), and a plurality of slide grooves (505) are provided inside the movable disk (504). The slide grooves (505) are convex-shaped, and a top block (506) is slidably provided inside the slide grooves (505).

7. The hydraulic valve with sealing detection function according to claim 6, characterized in that: The length of the top block (506) is smaller than the length of the slide groove (505). The top block (506) is also convex-shaped. The lower end of the top block (506) away from the mounting plate (501) is formed into an arc surface. The outer side of the movable plate (504) is surrounded by mounting blocks (507). The number of the mounting blocks (507) is the same as that of the top block (506).

8. The hydraulic valve with sealing detection function according to claim 7, characterized in that: The lower end of the mounting block (507) is fixedly connected to the mounting plate (501), the upper end of the mounting block (507) is provided with an inclined surface, and the upper end inclined surface of the mounting block (507) is inclined toward the center of the mounting plate (501), and a latch (508) is slidably arranged inside the mounting block (507), and the upper end of the latch (508) on a side close to the top block (506) is provided with an inclined surface.

9. The hydraulic valve with sealing detection function according to claim 8, characterized in that: A spring (509) is fixedly provided at a portion of the upper end of the latch (508) located inside the mounting block (507), and the other end of the spring (509) is fixedly connected to the mounting block (507). A clamping plate (511) is fixedly provided at the inner lower end of the sealing head (503).

10. The hydraulic valve with sealing detection function according to claim 9, characterized in that: The clamping plate (511) consists of two parts, an upper part and an lower part. The clamping plates (511) are connected by a telescopic rod. The clamping plate (511) located at the upper part is fixedly connected to the sealing head (503), and the clamping plate (511) located at the lower part is slidably connected to the sealing head (503). A sealing ring (510) is arranged between the clamping plates (511), and the height of the sealing ring (510) is smaller than the height between the clamping plates (511).

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