Oil immersion liquid leakage monitoring sensor
By using oil-immersed liquid leakage monitoring sensors in the environment where the oil body is stored, and using micro-pressure differential sensors and capillary glass probes to detect oil body leakage, the problem of difficulty in detecting oil body leakage in the existing technology is solved, efficient and timely detection of oil body leakage is achieved, and the risks of personal and property safety are reduced.
Patent Information
- Application Number
- CN202421540905.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-01
AI Technical Summary
The prior art is difficult to detect oil leakage in time when storing oil bodies, resulting in adverse effects on personal and property safety.
An oil-immersed liquid leakage monitoring sensor is adopted, including a micro-pressure differential sensor and a split probe, and a pressure difference is formed by using a capillary glass probe and a control member to detect oil leakage in a timely manner.
It can detect timely when a small amount of oil leaks, reduce the adverse impact on personal and property safety, and further improve the accuracy and timeliness of detection through the combination of multiple capillary glass probes and air contrast tube probes.
Smart Images
Figure CN222800277U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of storage oil leakage detection, and in particular to an oil-immersed liquid leakage monitoring sensor. Background Art
[0002] Oil is usually flammable and explosive, and has a certain degree of corrosiveness. Oil is also a non-conductive liquid. In the process of storing oil, gas sensors are usually used to detect whether the oil is leaking. However, oil can only be detected by gas sensors when it leaks to a certain extent at the leak point, which can easily cause damage to the surrounding environment and affect personal and property safety. Utility Model Content
[0003] In order to facilitate timely detection of oil leaks and reduce adverse effects on personal and property safety, the present application provides an oil-immersed liquid leakage monitoring sensor.
[0004] The oil-immersed liquid leakage monitoring sensor provided in this application adopts the following technical solution:
[0005] A sensor for monitoring leakage of oil-immersed liquid comprises a micro-pressure differential sensor and a split probe arranged at the lower side of the micro-pressure differential sensor, wherein a capillary glass probe inclined toward a side away from the micro-pressure differential sensor is inserted and fixedly connected in the split probe, a first air-conducting rubber tube facing the split probe is fixedly connected at the lower side of the micro-pressure differential sensor, the lower end of the air-conducting rubber tube is connected to the capillary glass probe, a reference piece is arranged in the split probe, and the micro-pressure differential sensor is wirelessly connected to a control host.
[0006] By adopting the above technical solution, the micro differential pressure sensor and the split probe are installed at the position where there may be an oil leak, and the lower end of the capillary glass is close to the ground and does not contact the ground. At this time, the capillary glass probe and the control piece do not form a pressure difference in the control host. When the oil leaks, since the pressure in the capillary glass probe is small, and the pressure of the leaked oil is greater than the pressure in the capillary glass probe, the oil enters the capillary glass probe. At this time, the values displayed by the capillary glass probe and the control group in the control host produce a pressure difference, so that when a small amount of oil leaks, it can be detected in time to reduce the adverse effects on personal and property safety.
[0007] Optionally, the control piece includes an air contrast tube probe inserted into the split probe and connected to the air, a second air-conducting rubber tube connected to the upper end of the air contrast tube probe is fixedly connected to the micro-pressure difference sensor, and the lower end height of the capillary glass probe is lower than the lower end height of the air contrast tube probe.
[0008] By adopting the above technical scheme, a contrast is formed between the air contrast tube probe and the capillary glass probe, which facilitates timely detection of oil leakage, and the height of the lower end of the air contrast tube probe is greater than the height of the lower end of the capillary glass probe, so that the air contrast tube probe is never in contact with the oil body, reducing the possibility of the capillary glass probe and the air contrast tube probe being in contact with the oil body at the same time and being difficult to detect, thereby facilitating timely detection of oil leakage points and reducing adverse effects on personal and property safety.
[0009] Optionally, the capillary glass probes are provided in plurality and are arranged along the width direction of the split probe, and the upper end of each capillary glass probe is connected to the first air-conducting rubber tube.
[0010] By adopting the above technical solution, when oil leaks, the oil is sucked into multiple capillary glass probes, thereby increasing the pressure difference displayed in the control host, making oil leakage easier to detect, further facilitating timely detection of oil leakage points, and reducing adverse effects on personal and property safety.
[0011] Optionally, an oil inlet groove is provided on the lower side of the split probe and is arranged along the length direction of the split probe, and the lower end of the capillary glass probe and the lower end of the air contrast tube probe are both located in the oil inlet groove.
[0012] By adopting the above technical solution, the split probe is located above the leaking point where oil may leak during installation. At this time, the leaking point is located in the oil inlet tank, so that when the oil leaks, the gas generated is not easy to disperse into the air. At the same time, the height of the leaked oil in the oil inlet tank increases rapidly and is sucked into the capillary glass probe, reducing the possibility of the oil spreading on the ground and being difficult to detect quickly, further facilitating timely detection of oil leaks and reducing adverse effects on personal and property safety.
[0013] Optionally, a frame is provided on the outside of the micro-pressure differential sensor, a fixing plate is fixedly connected to the inner wall of the upper end of the frame, mounting plates are fixedly connected to both ends of the micro-pressure differential sensor, the mounting plates are fixedly connected to the fixing plates by bolts, and a limiting component is provided on the lower side of the frame for driving the first air guide rubber tube and the second air guide rubber tube to be set along the height direction of the frame.
[0014] By adopting the above technical scheme, the micro-pressure differential sensor is installed on the frame through the fixing plate and the mounting plate, so that the micro-pressure differential sensor can be placed at the leakage point where oil may leak, reducing the possibility of inconvenience in installing the micro-pressure differential sensor, and improving the applicability of the micro-pressure differential sensor to the environment. In addition, the first air-conducting rubber tube and the second air-conducting rubber tube are arranged along the height direction of the frame through the limiting component, reducing the possibility of the first air-conducting rubber tube and the second air-conducting rubber tube bending under the action of external force and causing the distance between the capillary glass probe and the ground to increase, thereby facilitating timely detection of oil leakage points and reducing adverse effects on personal and property safety.
[0015] Optionally, the limiting assembly includes arc plates corresponding to the first air guide rubber tube and the second air guide rubber tube respectively, the lower ends of the first air guide rubber tube and the second air guide rubber tube can be inserted into the corresponding arc plates, and one side of the opening of the arc plate is provided with a sealing piece for sealing the arc plate.
[0016] By adopting the above technical solution, the lower ends of the first air guide rubber tube and the second air guide rubber tube are respectively inserted into the grooves formed by the corresponding arc plates. At this time, the opening of the arc plate is blocked by the sealing piece, and the side walls of the first air guide rubber tube and the second air guide rubber tube are in contact with the sealing piece and the arc plate, thereby reducing the possibility that the first air guide rubber tube and the second air guide rubber tube are bent under the action of external force, thereby increasing the distance between the capillary glass probe and the ground.
[0017] Optionally, the blocking member includes a hydraulic cylinder fixedly connected to one end of the arc-shaped plate, and a telescopic rod of the hydraulic cylinder passes through the end of the arc-shaped plate and abuts against an end of the arc-shaped plate away from the hydraulic cylinder.
[0018] By adopting the above technical solution, the telescopic rod of the hydraulic cylinder is shortened, and the opening formed on one side of the arc plate is opened, so that the lower ends of the first air-conducting rubber tube and the second air-conducting rubber tube are respectively inserted into the grooves formed by the corresponding arc plates. At this time, the telescopic rod of the hydraulic cylinder is driven to extend and block the opening of the arc plate. At this time, the side walls of the first air-conducting rubber tube and the second air-conducting rubber tube are in contact with the hydraulic cylinder and the arc plate, reducing the possibility of bending.
[0019] Optionally, the arc plates are located on the side where the first air-guiding rubber tube and the second air-guiding rubber tube are away from each other, and the sides where the arc plates are away from each other are fixedly connected to a driving plate, and the ends of the driving plates away from each other are bent toward the same side of the frame, and a bidirectional lead screw that passes through and rotatably connects to the frame and simultaneously passes through the bent end of the driving plate, and a guide rod that is fixedly connected to the frame is passed through and slidably connected to the bent end of the driving plate.
[0020] By adopting the above technical solution, the micro-pressure differential sensor is installed on the fixed plate. At this time, the bidirectional screw is driven to rotate and the arc plates are moved in a direction close to each other. The guide rod guides the arc plates to facilitate the first air guide rubber tube and the second air guide rubber tube to be inserted into the corresponding grooves of the arc plates, thereby improving work efficiency.
[0021] In summary, the present application includes at least one of the following beneficial technical effects:
[0022] 1. Install the micro differential pressure sensor and the split probe at the location where there may be oil leakage. The lower end of the capillary glass is close to the ground and does not touch the ground. At this time, the capillary glass probe and the control piece do not form a pressure difference in the control host. When the oil leaks, the pressure in the capillary glass probe is small, and the pressure of the leaked oil is greater than the pressure in the capillary glass probe. At this time, the oil enters the capillary glass probe. At this time, the values displayed in the control host by the capillary glass probe and the control group produce a pressure difference, so that a small amount of oil leakage can be detected in time, reducing the adverse effects on personal and property safety;
[0023] 2. The air contrast tube probe forms a contrast with the capillary glass probe, which facilitates timely detection of oil leakage. The lower end height of the air contrast tube probe is greater than the lower end height of the capillary glass probe, so that the air contrast tube probe is never in contact with the oil, reducing the possibility of the capillary glass probe and the air contrast tube probe being in contact with the oil at the same time and making it difficult to detect, facilitating timely detection of oil leakage points and reducing adverse effects on personal and property safety;
[0024] 3. When oil leaks, multiple capillary glass probes suck in the oil, which increases the pressure difference displayed in the control host, making oil leakage easier to detect, further facilitating timely detection of oil leaks and reducing adverse effects on personal and property safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a schematic diagram of the overall structure of the oil-immersed liquid leakage monitoring sensor in Example 1 of the present application.
[0026] Figure 2 It is a structural schematic diagram showing the positional relationship between the capillary glass probe and the air contrast tube probe in Example 1 of the present application.
[0027] Figure 3 It is a structural schematic diagram showing the positional relationship between the capillary glass probe and the connecting tube in Example 1 of the present application.
[0028] Figure 4 It is a structural schematic diagram showing the positional relationship between the frame and the micro-differential pressure sensor in Example 2 of the present application.
[0029] Figure 5 It is a structural diagram showing the positional relationship between the frame and the split probe in Example 2 of the present application.
[0030] Explanation of the reference numerals: 1. micro differential pressure sensor; 11. mounting plate; 111. mounting hole; 2. split probe; 21. oil inlet groove; 3. capillary glass probe; 31. connecting pipe; 32. first air guide rubber tube; 4. reference piece; 41. air contrast tube probe; 42. second air guide rubber tube; 5. frame; 51. fixing plate; 6. limit assembly; 61. arc plate; 62. hydraulic cylinder; 63. drive plate; 64. bidirectional screw; 65. motor; 66. guide rod. DETAILED DESCRIPTION
[0031] The present application is further described in detail below in conjunction with the accompanying drawings.
[0032] The embodiment of the present application discloses an oil-immersed liquid leakage monitoring sensor.
[0033] Example 1
[0034] Reference Figure 1 and Figure 2 An oil-immersed liquid leakage monitoring sensor includes a micro-pressure differential sensor 1 and a split probe 2 located below the micro-pressure differential sensor 1. Both ends of the micro-pressure differential sensor 1 are fixedly connected with vertical mounting plates 11. The middle part of the mounting plate 11 in the length direction is provided with mounting holes 111. The micro-pressure differential sensor 1 can be installed and fixed above the oil leakage point to be monitored by passing bolts through the mounting holes 111.
[0035] Reference Figure 1 and Figure 2 The lower side of the split probe is provided with an oil inlet groove 21 arranged along the length direction of the split probe 2, and one end of the oil inlet groove 21 is provided with a plurality of capillary glass probes 3 arranged along the width direction of the split probe 2. In the embodiment of the present application, three capillary glass probes 3 are provided. Figure 2 and Figure 3 The lower end of the capillary glass probe 3 is tilted downward, and the upper end of the capillary glass probe 3 is inserted into the split probe 2 and fixedly connected and communicated with a connecting tube 31 at the same level. The connecting tube 31 is arranged along the width direction of the split probe 2.
[0036] A vertical first air-conducting rubber tube 32 is fixedly connected to one end of the lower side of the micro differential pressure sensor 1, the lower end of the first air-conducting rubber tube 32 is inserted into the split probe 2 and fixedly connected to the split probe 2, and the lower end of the first air-conducting rubber tube 32 is fixedly connected to the middle of the connecting tube 31 and communicated with the inside of the connecting tube 31, and the lower ends of the capillary glass probes 3 are all communicated with the oil inlet groove 21. A reference piece 4 is provided on the split probe 2 to form a contrast with the capillary glass probe 3, and the micro differential pressure sensor 1 is wirelessly connected to a control host (not shown in the figure) that displays the pressure difference between the capillary glass probe 3 and the reference piece 4.
[0037] The micro differential pressure sensor 1 and the split probe 2 are installed at a position where there may be an oil leak through the mounting plate 11. The lower end of the capillary glass is close to the ground and does not contact the ground. At this time, the capillary glass probe 3 and the control piece 4 do not form a pressure difference in the control host. When the oil leaks, the pressure in the capillary glass probe 3 is small, and the pressure of the leaked oil is greater than the pressure in the capillary glass probe 3. At this time, the oil enters the capillary glass probe 3, and the micro differential pressure sensor 1 converts the pressure difference between the capillary glass probe 3 and the control group into an electrical signal and transmits it to the control host. At this time, the control host displays the pressure difference value and alarms, which is convenient for timely detection when a small amount of oil leaks.
[0038] When oil leaks, the oil is sucked into the multiple capillary glass probes 3, so that the pressure difference displayed in the control host increases, making the oil leakage easier to detect; and the leakage point is located in the oil inlet groove 21 during installation, so that when the oil leaks, the gas generated is not easy to disperse into the air. At the same time, the height of the leaked oil in the oil inlet groove 21 increases rapidly and is sucked into the capillary glass probe 3, reducing the possibility of the oil spreading on the ground and being difficult to detect quickly.
[0039] Reference Figure 1 and Figure 2 The control member 4 includes a vertical air contrast tube probe 41 located in the oil inlet groove 21 and connected to the oil inlet groove 21 at the lower end. The upper end of the air contrast tube probe 41 is inserted into the split probe 2 and fixedly connected to the split probe 2, and the lower end height of the air contrast tube probe 41 is greater than the lower end height of the capillary glass probe 3. A vertical second air guide rubber tube 42 is fixedly connected to one end of the lower side of the micro-pressure differential sensor 1 away from the first air guide rubber tube 32. The lower end of the second air guide rubber tube 42 is inserted into the split probe 2 and fixedly connected to the split probe 2, and the lower end of the second air guide rubber tube 42 is fixedly connected and connected to the upper end of the air contrast tube probe 41.
[0040] By forming a contrast between the air contrast tube probe 41 and the capillary glass probe 3, oil leakage can be detected in time, and the lower end height of the air contrast tube probe 41 is greater than the lower end height of the capillary glass probe 3, so that the air contrast tube probe 41 is never in contact with the oil, reducing the possibility that the capillary glass probe 3 and the air contrast tube probe 41 are in contact with the oil at the same time and difficult to detect.
[0041] The implementation principle of Example 1 is as follows: the micro-pressure differential sensor 1 and the split probe 2 are installed at a position where there may be an oil leak through the mounting plate 11, and the lower end of the capillary glass is close to the ground and does not contact the ground. At this time, the capillary glass probe 3 and the air contrast tube probe 41 do not form a pressure difference in the control host. When the oil leaks, since the pressure in the capillary glass probe 3 is relatively small, the pressure of the leaked oil is greater than the pressure in the capillary glass probe 3. At this time, the oil enters the capillary glass probe 3, and the micro-pressure differential sensor 1 converts the pressure difference between the capillary glass probe 3 and the air contrast tube probe 41 into an electrical signal and transmits it to the control host. At this time, the control host displays the pressure difference value and alarms, which is convenient for timely detection when a small amount of oil leaks.
[0042] Example 2
[0043] Reference Figure 4 and Figure 5 The difference between this embodiment and embodiment 1 is that a frame 5 is provided on the outside of the micro-pressure differential sensor 1, and a vertical fixing plate 51 corresponding to the mounting plate 11 is provided on the upper end of the frame 5 and on one side close to the micro-pressure differential sensor 1. The fixing plates 51 are symmetrically arranged on both sides of the micro-pressure differential sensor 1, and the mounting plate 11 and the corresponding fixing plate 51 are fixed to each other through mounting holes 111 and bolts.
[0044] The four corners of the lower end of the frame 5 are rotatably connected with rollers (not shown in the figure) to facilitate the frame 5 to drive the micro-pressure difference sensor 1 to move. The lower side of the frame 5 is provided with a limit assembly 6 that drives the first air guide rubber tube 32 and the second air guide rubber tube 42 to remain vertical.
[0045] The micro-pressure differential sensor 1 is installed on the frame 5 by the fixing plate 51 and the mounting plate 11, so that the micro-pressure differential sensor 1 can be placed at the leakage point where oil may leak, thereby reducing the possibility of inconvenience in installing the micro-pressure differential sensor 1 and improving the environmental applicability of the micro-pressure differential sensor 1. The first air guide rubber tube 32 and the second air guide rubber tube 42 are arranged along the height direction of the frame 5 by the limiting component 6, thereby reducing the possibility of the first air guide rubber tube 32 and the second air guide rubber tube 42 bending under the action of external force and causing the distance between the capillary glass probe 3 and the ground to increase, thereby facilitating timely detection of oil leakage points.
[0046] Reference Figure 4 and Figure 5The limit assembly 6 includes an arc plate 61 corresponding to the first air guide rubber tube 32 and the second air guide rubber tube 42 respectively. The arc plates 61 are located on the side away from each other of the first air guide rubber tube 32 and the second air guide rubber tube 42. The arc plate 61 is set in a U shape and the opening is facing the side close to each other. A blocking member for blocking the opening of the arc plate 61 is provided at the opening of the arc plate 61. In the embodiment of the present application, the blocking member is set as a hydraulic cylinder 62 fixedly connected to one end of the arc plate 61. The hydraulic cylinder 62 is located on the same side of the arc plate 61, and the telescopic rod of the hydraulic cylinder 62 passes through the arc plate 61 and abuts against the side wall of the other end of the arc plate 61.
[0047] A horizontal driving plate 63 is fixedly connected to the middle of the side away from each other on the arc-shaped plates 61, and the ends of the driving plates 63 away from each other are bent at a right angle in the direction away from the hydraulic cylinder 62. A horizontal bidirectional lead screw 64 is passed through and rotatably connected to the side of the lower end of the frame 5 away from the hydraulic cylinder 62, and the bidirectional lead screw 64 passes through the bent end of the driving plate 63 and is threadedly connected to the driving plate 63, and a motor 65 fixedly connected to the frame 5 is installed at one end of the bidirectional lead screw 64.
[0048] A horizontal guide rod 66 is passed through one bent end of the driving plate 63 and is located on the side of the bidirectional lead screw 64 away from the hydraulic cylinder 62 . The guide rod 66 is fixedly connected to the frame 5 , and the driving plate 63 is slidably connected to the guide rod 66 .
[0049] The telescopic rod of the hydraulic cylinder 62 is shortened, and the opening formed on one side of the arc plate 61 is opened. The motor 65 drives the bidirectional screw 64 to rotate and makes the arc plate 61 move towards each other. The guide rod 66 guides the driving plate 63 until the first air guide rubber tube 32 and the second air guide rubber tube 42 are inserted into the corresponding grooves of the arc plate 61. At this time, the telescopic rod of the hydraulic cylinder 62 is extended and blocks the opening of the arc plate 61. At this time, the side walls of the first air guide rubber tube 32 and the second air guide rubber tube 42 are in contact with the hydraulic cylinder 62 and the arc plate 61, reducing the possibility that the first air guide rubber tube 32 and the second air guide rubber tube 42 are bent under the action of external force, thereby increasing the distance between the capillary glass probe 3 and the ground.
[0050] The implementation principle of Example 2 is as follows: the micro-pressure differential sensor 1 is installed on the frame 5 through the fixing plate 51 and the mounting plate 11, the motor 65 drives the bidirectional screw 64 to rotate and makes the arc plate 61 move in the direction of approaching each other, and the guide rod 66 guides the driving plate 63 until the first air-conducting rubber tube 32 and the second air-conducting rubber tube 42 are inserted into the corresponding grooves of the arc plate 61. At this time, the telescopic rod of the hydraulic cylinder 62 is extended and blocks the opening of the arc plate 61. At this time, the side walls of the first air-conducting rubber tube 32 and the second air-conducting rubber tube 42 are in contact with the hydraulic cylinder 62 and the arc plate 61, reducing the possibility that the first air-conducting rubber tube 32 and the second air-conducting rubber tube 42 are bent under the action of external force, thereby increasing the distance between the capillary glass probe 3 and the ground.
[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. An oil-immersed liquid leakage monitoring sensor, characterized in that: The invention comprises a micro differential pressure sensor (1) and a split probe (2) arranged at the lower side of the micro differential pressure sensor (1); a capillary glass probe (3) inclined towards a side away from the micro differential pressure sensor (1) is inserted and fixedly connected in the split probe (2); a first air guide rubber tube (32) facing the split probe (2) is fixedly connected at the lower side of the micro differential pressure sensor (1); the lower end of the air guide rubber tube is in communication with the capillary glass probe (3); a reference piece (4) is provided in the split probe (2); and the micro differential pressure sensor (1) is wirelessly connected to a control host.
2. The oil-immersed liquid leakage monitoring sensor according to claim 1, characterized in that: The control element (4) comprises an air contrast tube probe (41) inserted into the split probe (2) and connected to the air, a second air guide rubber tube (42) connected to the upper end of the air contrast tube probe (41) is fixedly connected to the micro differential pressure sensor (1), and the lower end of the capillary glass probe (3) is lower than the lower end of the air contrast tube probe (41).
3. The oil-immersed liquid leakage monitoring sensor according to claim 2, characterized in that: The capillary glass probes (3) are arranged in a plurality and arranged along the width direction of the split probe (2), and the upper end of each capillary glass probe (3) is in communication with the first air-conducting rubber tube (32).
4. The oil-immersed liquid leakage monitoring sensor according to claim 3, characterized in that: An oil inlet groove (21) is provided on the lower side of the split probe (2) and is arranged along the length direction of the split probe (2). The lower end of the capillary glass probe (3) and the lower end of the air contrast tube probe (41) are both located in the oil inlet groove (21).
5. The oil-immersed liquid leakage monitoring sensor according to claim 3, characterized in that: A frame (5) is provided on the outside of the micro differential pressure sensor (1); a fixing plate (51) is fixedly connected to the inner side wall of the upper end of the frame (5); mounting plates (11) are fixedly connected to both ends of the micro differential pressure sensor (1); the mounting plates (11) are fixedly connected to the fixing plates (51) by bolts; and a limit assembly (6) is provided on the lower side of the frame (5) for driving the first air guide rubber tube (32) and the second air guide rubber tube (42) to be arranged along the height direction of the frame (5).
6. The oil-immersed liquid leakage monitoring sensor according to claim 5, characterized in that: The limiting assembly (6) comprises arc-shaped plates (61) corresponding to the first air-conducting rubber tube (32) and the second air-conducting rubber tube (42) respectively; the lower ends of the first air-conducting rubber tube (32) and the second air-conducting rubber tube (42) can be inserted into the corresponding arc-shaped plates (61); and a sealing member for sealing the arc-shaped plates (61) is provided on one side of the opening of the arc-shaped plates (61).
7. The oil-immersed liquid leakage monitoring sensor according to claim 6, characterized in that: The blocking member comprises a hydraulic cylinder (62) fixedly connected to one end of the arc-shaped plate (61), and a telescopic rod of the hydraulic cylinder (62) passes through the end of the arc-shaped plate (61) and abuts against an end of the arc-shaped plate (61) away from the hydraulic cylinder (62).
8. The oil-immersed liquid leakage monitoring sensor according to claim 7, characterized in that: The arc-shaped plates (61) are located on a side away from each other of the first air-guiding rubber tube (32) and the second air-guiding rubber tube (42); the side away from each other of the arc-shaped plates (61) is fixedly connected to a driving plate (63); the ends of the driving plates (63) away from each other are bent toward the same side of the frame (5); a bidirectional lead screw (64) passing through and rotatably connected to the frame (5) and simultaneously passing through the bent end of the driving plate (63); and a guide rod (66) fixedly connected to the frame (5) is passed through and slidably connected to the bent end of the driving plate (63).