Chemical adding device for hydrogen peroxide in chemical cleaning of power plant boiler

Abstract

The utility model discloses a chemical feeding device for hydrogen peroxide in chemical cleaning of a power plant boiler, which comprises a chemical feeding barrel, a cleaning strip is arranged in the chemical feeding barrel, one side of the cleaning strip is in contact with the inner wall of the chemical feeding barrel, a driving assembly is arranged on the chemical feeding barrel, and one side of the outer wall of the driving assembly is hinged with a connecting assembly and a plurality of straight corner connectors. The connecting assembly is located above the multiple straight-line-shaped corner connectors, a connecting strip is hinged to the end, away from the driving assembly, of the connecting assembly, the ends, away from the driving assembly, of the straight-line-shaped corner connectors are hinged to one side of the connecting strip, and the inner wall of the connecting strip is connected with the outer wall of one side of the cleaning strip; according to the scheme, after the dosing barrel is used, the driving assembly is started, the cleaning strip can be controlled to move along the inner wall of the dosing barrel through cooperation of the connecting assembly, the linear corner connector and the connecting strip, the inner wall of the dosing barrel can be scraped, brushed and cleaned through movement of the cleaning strip, and therefore the mode that manual cleaning is needed can be replaced; and manpower can be saved.

Description

Technical Field

[0001] This application relates to the technical field of chemical dosing devices, and in particular to a hydrogen peroxide dosing device for chemical cleaning of power plant boilers. Background Technology

[0002] Power plant boilers are crucial equipment in power plants, used to heat water into high-temperature, high-pressure steam to drive steam turbines for electricity generation. Boilers convert chemical energy into thermal energy by burning fuels such as coal, natural gas, or biomass, and then heat water into steam. After prolonged use, scale builds up on the inner walls of boilers, typically requiring hydrogen peroxide to break down stubborn organic matter and rust. Hydrogen peroxide used for chemical cleaning power plant boilers is usually stored in a specialized dosing system for easy application into the boiler.

[0003] In related technologies, hydrogen peroxide used for chemical cleaning of power plant boilers is mainly added through a dosing device. Since residual solution adheres to the inner wall of the dosing device after it has stored hydrogen peroxide, the inside of the dosing device is usually cleaned manually after use. During cleaning, the operator needs to hold a water hose to rinse the inner wall of the dosing device. In order to enhance the cleaning effect, a cleaning brush is also needed to scrape and clean the inner wall of the dosing device. However, some dosing devices have limited openings, which may make it inconvenient for personnel to clean, and may also increase the labor intensity of personnel, which is not conducive to practical use.

[0004] Therefore, those skilled in the art have provided a hydrogen peroxide dosing device for chemical cleaning of power plant boilers to solve the problems mentioned in the background art. Utility Model Content

[0005] To address the inconvenience for personnel when cleaning the chemical dosing device as mentioned in the background art, this application provides a hydrogen peroxide dosing device for chemical cleaning of power plant boilers.

[0006] The hydrogen peroxide dosing device for chemical cleaning of power plant boilers provided in this application adopts the following technical solution:

[0007] A hydrogen peroxide dosing device for chemical cleaning of power plant boilers includes a dosing tank, an internal cleaning strip with one side of the cleaning strip contacting the inner wall of the dosing tank, a drive assembly mounted on the dosing tank, a connecting assembly and multiple angle brackets hinged to one side of the outer wall of the drive assembly, the connecting assembly located above the angle brackets, a connecting strip hinged to the end of the connecting assembly away from the drive assembly, the end of each angle bracket away from the drive assembly hinged to one side of the connecting strip, the inner wall of the connecting strip connecting to one side of the outer wall of the cleaning strip, a limiting member and a limiting block, wherein the limiting member is movably mounted on the connecting assembly, one side of the limiting block is fixedly connected to the outer wall of the drive assembly and located on the lower surface of the connecting assembly, and one end of the limiting member is movably inserted into the inner wall of the limiting block.

[0008] By adopting the above technical solution, the start-up drive component, through the cooperation of the connecting component, the corner code and the connecting strip, can control the cleaning strip to move and clean along the inner wall of the dosing tank, thereby replacing the manual cleaning method and saving manpower.

[0009] Preferably, the dosing tank includes a tank body, with a dosing port fixedly connected to the upper surface of the tank body and communicating with the tank body, and a discharge valve fixedly connected to one side of the tank body and communicating with the tank body.

[0010] By adopting the above technical solution, cleaning liquids such as hydrogen peroxide can be added into the tank through the dosing port, and the liquid inside the tank can be discharged out through the drain valve.

[0011] Preferably, the cleaning strip includes a first rectangular strip, with bristles evenly fixedly connected to one side of the first rectangular strip, and a T-shaped mounting strip fixedly connected to the other side of the first rectangular strip. The T-shaped mounting strip is located inside the connecting strip, and a limiting hole is formed on the side of the T-shaped mounting strip away from the first rectangular strip.

[0012] By adopting the above technical solution, the T-shaped installation strip can limit the installation position of the first rectangular strip on the connecting strip, and the first rectangular strip can limit the installation position of the bristles. The bristles can scrape and clean the inner wall of the barrel.

[0013] Preferably, the connecting strip includes a third rectangular strip hinged to one end of the connecting assembly and the plurality of one-way corner brackets. A T-shaped groove is provided on one side of the third rectangular strip, and the T-shaped mounting strip is located inside the T-shaped groove. A threaded hole communicating with the T-shaped groove is provided on the other side of the third rectangular strip. A butterfly fixing bolt is provided inside the threaded hole, and the two are threadedly connected. One end of the butterfly fixing bolt is located inside the limiting hole.

[0014] By adopting the above technical solution, the T-groove and the T-shaped mounting strip cooperate to limit the installation position of the first rectangular strip on the third rectangular strip, and the threaded hole can limit the installation and adjustment position of the butterfly fixing bolt. When one end of the butterfly fixing bolt is adjusted to be inside the limiting hole, the cleaning strip can be limited.

[0015] Preferably, the drive assembly includes a motor fixedly connected to the upper surface of the barrel, the output end of the motor being fixedly connected to a shaft through the barrel, and the outer wall of the shaft being hinged to one end of the connecting assembly and the corner bracket.

[0016] By adopting the above technical solution, the starter motor can drive the connecting components and the corner code to move by controlling the rotation of the shaft.

[0017] Preferably, the connecting component includes a second rectangular strip hinged to the outer wall of the driving component, one end of the second rectangular strip away from the driving component being hinged to one side of the third rectangular strip, a storage groove extending through the second rectangular strip, the limiting member passing through the interior of the storage groove, a guide rod being provided inside the storage groove, and the outer wall of the guide rod being slidably connected to the inner wall of the limiting member.

[0018] By adopting the above technical solution, the second rectangular bar can be connected between the drive component and the third rectangular bar, and the storage slot and guide rod can restrict the installation and movement position of the limiting component.

[0019] Preferably, the limiting member includes a movable plate located on the upper surface of the second rectangular strip, a connecting plate fixedly connected to the lower surface of one end of the movable plate, the inner wall of the connecting plate being slidably connected to the outer wall of the guide rod, a limiting strip fixedly connected to the lower end face of the connecting plate, the end of the limiting strip away from the connecting plate being movably inserted into the inner wall of the limiting block, a handle fixedly connected to the upper surface of the movable plate, a spring elastically connected to the side of the connecting plate away from the limiting block, and the guide rod passing through the interior of the spring.

[0020] By adopting the above technical solution, the elastic force of the spring can limit one end of the limiting strip to remain in the state of being inserted with the limiting block. The operator can control the movement of the moving plate through the handle. When the moving plate moves, the connecting plate can drive the limiting strip to move, so that the insertion part of the limiting strip and the limiting block can be separated. This makes it easy for the operator to pull the handle to adjust the position of the second rectangular strip.

[0021] In summary, this application includes the following beneficial technical effects:

[0022] 1. The hydrogen peroxide dosing device for chemical cleaning of the power plant boiler is equipped with a dosing tank for storing hydrogen peroxide for chemical cleaning of the power plant boiler. After the dosing tank is used, the drive component is activated and, through the connection component, the angle bracket and the connecting strip, controls the cleaning strip to move along the inner wall of the dosing tank, thereby scraping and cleaning the inner wall of the dosing tank, which can replace the manual cleaning method and save manpower.

[0023] 2. The hydrogen peroxide dosing device in the chemical cleaning of the power plant boiler has a limiting component that is inserted into the inside of a limiting block to restrict the position of the connecting components. By limiting the connecting components, the position of the connecting strip and the cleaning strip can be restricted. Personnel can control the movement of the moving plate through the handle. When the moving plate moves, the connecting plate can drive the limiting strip to move, which can separate the limiting strip from the insertion part of the limiting block. This makes it easy for personnel to pull the handle to adjust the position of the second rectangular strip. By tilting the second rectangular strip, the connecting strip can drive the cleaning strip to move upward, which makes it easy for personnel to disassemble, clean or replace the cleaning strip. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a hydrogen peroxide dosing device for chemical cleaning of a power plant boiler, as described in an embodiment of this application.

[0025] Figure 2 This is a cross-sectional view of a hydrogen peroxide dosing device for chemical cleaning of a power plant boiler, as described in an embodiment of this application.

[0026] Figure 3 This is a schematic diagram of the cleaning strip and connecting strip structure of a hydrogen peroxide dosing device in the chemical cleaning of a power plant boiler according to an embodiment of this application;

[0027] Figure 4 This application describes a hydrogen peroxide dosing device for chemical cleaning of a power plant boiler. Figure 2 Enlarged schematic diagram of the structure at point A in the diagram;

[0028] Figure 5 This is a schematic diagram of the limiting component structure of a hydrogen peroxide dosing device in the chemical cleaning of a power plant boiler, according to an embodiment of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Dosing tank; 101. Tank body; 102. Dosing port; 103. Discharge valve; 2. Cleaning strip; 201. First rectangular strip; 202. Brush bristles; 203. T-shaped mounting strip; 204. Limiting hole; 3. Drive assembly; 301. Motor; 302. Shaft; 4. Connecting assembly; 401. Second rectangular strip; 402. Storage slot; 403. Guide rod; 5. Connecting strip; 501. Third rectangular strip; 502. T-slot; 503. Threaded hole; 504. Butterfly-shaped fixing bolt; 6. Limiting component; 601. Moving plate; 602. Connecting plate; 603. Limiting strip; 604. Handle; 605. Spring; 7. Limiting block; 8. I-shaped corner bracket. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0031] This application discloses a hydrogen peroxide dosing device for chemical cleaning of power plant boilers. (Refer to...) Figure 1 and Figure 2 A hydrogen peroxide dosing device for chemical cleaning of power plant boilers includes a dosing tank 1, a cleaning strip 2 inside the dosing tank 1, one side of the cleaning strip 2 contacting the inner wall of the dosing tank 1, a drive assembly 3 mounted on the dosing tank 1, a connecting assembly 4 and multiple angle brackets 8 hinged to one side of the outer wall of the drive assembly 3, the connecting assembly 4 being located above the multiple angle brackets 8, a connecting strip 5 hinged to the end of the connecting assembly 4 away from the drive assembly 3, the end of the angle brackets 8 away from the drive assembly 3 being hinged to one side of the connecting strip 5, the inner wall of the connecting strip 5 being connected to one side of the outer wall of the cleaning strip 2, a limiting member 6 and a limiting block 7, wherein the limiting member 6 is movably mounted on the connecting assembly 4, one side of the limiting block 7 is fixedly connected to the outer wall of the drive assembly 3 and the limiting block 7 is located on the lower surface of the connecting assembly 4, and one end of the limiting member 6 is movably inserted into the inner wall of the limiting block 7.

[0032] In this embodiment, the hydrogen peroxide dosing device in the chemical cleaning of the power plant boiler is equipped with a dosing tank 1, which stores the hydrogen peroxide used for chemical cleaning of the power plant boiler. The dosing tank 1 restricts the installation position of the drive assembly 3. A connecting strip 5 is installed on one side of the drive assembly 3 through a connecting assembly 4 and multiple angle brackets 8. The connecting strip 5 restricts the installation position of the cleaning strip 2, so that one side of the cleaning strip 2 contacts the inner wall of the dosing tank 1. Thus, when the drive assembly 3 is started, the connecting assembly 4, angle brackets 8 and connecting strip 5 can control the cleaning strip 2 to move along the inner wall of the dosing tank 1. The movement of the cleaning strip 2 can scrape and clean the inner wall of the dosing tank 1, thereby replacing the manual cleaning method, saving manpower and making this application more practical. Furthermore, the two ends of the connecting assembly 4 and the angle brackets 8 are hinged to the drive assembly 3 and the connecting strip 5, respectively, so that the user can manually control the up and down movement of the connecting strip 5. When the connecting strip 5 moves upward, The connecting component 4 and the angle bracket 8 are inclined, which can control the separation of the contact part between the cleaning strip 2 and the dosing tank 1, thereby facilitating the disassembly, cleaning, or replacement of the cleaning strip 2. When the connecting strip 5 moves down, the connecting component 4 and the angle bracket 8 are horizontally positioned, which can control the contact between the cleaning strip 2 and the inner wall of the dosing tank 1 for cleaning. Furthermore, a limiting component 6 is installed on the connecting component 4, and one end of the limiting component 6 is movably connected to the limiting block 7 installed on the drive component 3. When one end of the limiting member 6 is inserted into the inside of the limiting block 7, it can restrict the position of the connecting component 4. By limiting the connecting component 4, the position of the connecting strip 5 and the cleaning strip 2 can be restricted, thereby ensuring the normal use of the cleaning strip 2. When the cleaning strip 2 needs to be disassembled, the operator can control the limiting member 6 to move, so that the limiting member 6 is separated from the insertion part of the limiting block 7. Then, by pulling the limiting member 6 upward, the connecting component 4 can be tilted, so that the connecting strip 5 can move the cleaning strip 2 upward, so that the operator can disassemble it.

[0033] In a further preferred embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the dosing tank 1 includes a tank body 101, a dosing port 102 that communicates with the tank body 101 is fixedly connected to the upper surface of the tank body 101, and a discharge valve 103 that communicates with the tank body 101 is fixedly connected to one side of the tank body 101.

[0034] In this embodiment, cleaning liquids such as hydrogen peroxide can be added into the tank 101 through the dosing port 102. At the same time, the operator can also adjust the limiting member 6 and disassemble the cleaning strip 2 through the dosing port 102. The liquid inside the tank 101 can be discharged outward through the discharge valve 103.

[0035] In a further preferred embodiment of this utility model, such as Figure 2 and Figure 3 As shown, the cleaning strip 2 includes a first rectangular strip 201, with bristles 202 evenly fixedly connected to one side of the first rectangular strip 201, and a T-shaped mounting strip 203 fixedly connected to the other side of the first rectangular strip 201. The T-shaped mounting strip 203 is located inside the connecting strip 5, and a limiting hole 204 is provided on the side of the T-shaped mounting strip 203 away from the first rectangular strip 201.

[0036] In this embodiment, the T-shaped mounting strip 203 can restrict the installation position of the first rectangular strip 201 on the connecting strip 5, the first rectangular strip 201 can restrict the installation position of the bristles 202, and the bristles 202 can scrape and clean the inner wall of the barrel 101.

[0037] In a further preferred embodiment of this utility model, such as Figure 2 and Figure 3 As shown, the connecting strip 5 includes a third rectangular strip 501 hinged to one end of the connecting component 4 and multiple straight corner brackets 8. A T-shaped groove 502 is provided on one side of the third rectangular strip 501, and a T-shaped mounting strip 203 is located inside the T-shaped groove 502. A threaded hole 503 communicating with the T-shaped groove 502 is provided on the other side of the third rectangular strip 501. A butterfly fixing bolt 504 is provided inside the threaded hole 503, and the two are threadedly connected. One end of the butterfly fixing bolt 504 is located inside the limiting hole 204.

[0038] In this embodiment, the T-shaped groove 502, in conjunction with the T-shaped mounting strip 203, can restrict the installation position of the first rectangular strip 201 on the third rectangular strip 501. The threaded hole 503 can restrict the installation and adjustment position of the butterfly fixing bolt 504. When the operator adjusts one end of the butterfly fixing bolt 504 to be inside the limiting hole 204, the cleaning strip 2 can be limited, thereby enhancing the stability of the cleaning strip 2 installation.

[0039] In a further preferred embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the drive assembly 3 includes a motor 301 fixedly connected to the upper surface of the barrel 101. The output end of the motor 301 passes through the barrel 101 and is fixedly connected to a shaft 302. The outer wall of the shaft 302 is hinged to one end of the connecting assembly 4 and the one-way corner code 8.

[0040] In this embodiment, the starter motor 301 can drive the shaft 302 to rotate, and the rotation of the shaft 302 can drive the connecting component 4 and the corner code 8 to move.

[0041] In a further preferred embodiment of this utility model, such as Figure 2 , Figure 3and Figure 4 As shown, the connecting component 4 includes a second rectangular strip 401 hinged to the outer wall of the driving component 3. One end of the second rectangular strip 401 away from the driving component 3 is hinged to one side of the third rectangular strip 501. A storage groove 402 is provided on the second rectangular strip 401 through which the second rectangular strip 401 passes. A limiting member 6 passes through the interior of the storage groove 402. A guide rod 403 is provided inside the storage groove 402. The outer wall of the guide rod 403 is slidably connected to the inner wall of the limiting member 6.

[0042] In this embodiment, the second rectangular bar 401 can be connected between the drive component 3 and the third rectangular bar 501. The storage slot 402 and the guide rod 403 are used to restrict the installation and movement of the limiting member 6.

[0043] In a further preferred embodiment of this utility model, such as Figure 3 , Figure 4 and Figure 5 As shown, the limiting member 6 includes a movable plate 601 located on the upper surface of the second rectangular bar 401. A connecting plate 602 is fixedly connected to the lower surface of one end of the movable plate 601. The inner wall of the connecting plate 602 is slidably connected to the outer wall of the guide rod 403. A limiting strip 603 is fixedly connected to the lower end face of the connecting plate 602. The end of the limiting strip 603 away from the connecting plate 602 is movably inserted into the inner wall of the limiting block 7. A handle 604 is fixedly connected to the upper surface of the movable plate 601. A spring 605 is elastically connected to the side of the connecting plate 602 away from the limiting block 7. The guide rod 403 passes through the interior of the spring 605.

[0044] In this embodiment, when there is no external force, the spring force of the spring 605 can limit the position of the limiting strip 603, keeping one end of the limiting strip 603 in an inserted state with the inside of the limiting block 7. The operator can control the moving plate 601 to move through the handle 604. When the moving plate 601 moves, the connecting plate 602 can drive the limiting strip 603 to move, so that the limiting strip 603 can be separated from the inserted part of the limiting block 7, thereby making it easy for the operator to pull the handle 604 to adjust the position of the second rectangular strip 401.

[0045] The implementation principle of the hydrogen peroxide dosing device in the chemical cleaning of a power plant boiler according to an embodiment of this application is as follows:

[0046] In use, hydrogen peroxide for chemical cleaning of power plant boilers is stored in the dosing tank 1. After the dosing tank 1 is used, the drive assembly 3 is activated and, in cooperation with the connecting assembly 4, the angle bracket 8 and the connecting strip 5, controls the cleaning strip 2 to move along the inner wall of the dosing tank 1. The movement of the cleaning strip 2 can scrape and clean the inner wall of the dosing tank 1, thus replacing the manual cleaning method, saving manpower and making this application more practical.

[0047] The limiting member 6 is installed on the connecting component 4. When one end of the limiting member 6 is inserted into the limiting block 7, it can restrict the position of the connecting component 4. By limiting the connecting component 4, the position of the connecting strip 5 and the cleaning strip 2 can be restricted to ensure the normal use of the cleaning strip 2. When the cleaning strip 2 needs to be disassembled, the personnel can control the limiting member 6 to move, so that the limiting member 6 is separated from the insertion part of the limiting block 7. Then, by pulling the limiting member 6 upward, the connecting component 4 can be tilted, so that the connecting strip 5 can move the cleaning strip 2 upward, so that the personnel can disassemble, clean or replace the cleaning strip 2.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hydrogen peroxide dosing device for chemical cleaning of power plant boilers, comprising a dosing tank (1), characterized in that: The inside of the dosing tank (1) is provided with a cleaning strip (2), one side of which is in contact with the inner wall of the dosing tank (1); A drive assembly (3) is mounted on the dosing tank (1). A connecting assembly (4) and multiple angle brackets (8) are hinged to one side of the outer wall of the drive assembly (3). The connecting assembly (4) is located above the multiple angle brackets (8). A connecting strip (5) is hinged to one end of the connecting assembly (4) away from the drive assembly (3). One end of each angle bracket (8) away from the drive assembly (3) is hinged to one side of the connecting strip (5). The inner wall of the connecting strip (5) is connected to one side of the outer wall of the cleaning strip (2). The limiting member (6) and the limiting block (7) are provided, wherein the limiting member (6) is movably disposed on the connecting assembly (4), one side of the limiting block (7) is fixedly connected to the outer wall of the driving assembly (3), and the limiting block (7) is located on the lower surface of the connecting assembly (4), and one end of the limiting member (6) is movably inserted into the inner wall of the limiting block (7).

2. The hydrogen peroxide dosing device for chemical cleaning of power plant boilers according to claim 1, characterized in that: The dosing tank (1) includes a tank body (101), and a dosing port (102) communicating with the tank body (101) is fixedly connected to the upper surface of the tank body (101). A discharge valve (103) communicating with the tank body (101) is fixedly connected to one side of the tank body (101).

3. The hydrogen peroxide dosing device for chemical cleaning of power plant boilers according to claim 2, characterized in that: The cleaning strip (2) includes a first rectangular strip (201), on one side of the first rectangular strip (201) bristles (202) are uniformly fixedly connected, and on the other side of the first rectangular strip (201) a T-shaped mounting strip (203) is fixedly connected. The T-shaped mounting strip (203) is located inside the connecting strip (5), and a limiting hole (204) is opened on the side of the T-shaped mounting strip (203) away from the first rectangular strip (201).

4. The hydrogen peroxide dosing device for chemical cleaning of power plant boilers according to claim 3, characterized in that: The connecting strip (5) includes a third rectangular strip (501) hinged to one end of the connecting assembly (4) and the plurality of one-way brackets (8). A T-shaped groove (502) is provided on one side of the third rectangular strip (501), and the T-shaped mounting strip (203) is located inside the T-shaped groove (502). A threaded hole (503) communicating with the T-shaped groove (502) is provided on the other side of the third rectangular strip (501). A butterfly fixing bolt (504) is provided inside the threaded hole (503), and the two are threadedly connected. One end of the butterfly fixing bolt (504) is located inside the limiting hole (204).

5. A hydrogen peroxide dosing device for chemical cleaning of power plant boilers according to claim 4, characterized in that: The drive assembly (3) includes a motor (301) fixedly connected to the upper surface of the barrel (101). The output end of the motor (301) is fixedly connected to a shaft (302) through the barrel (101). The outer wall of the shaft (302) is hinged to one end of the connecting assembly (4) and the one-line corner code (8).

6. The hydrogen peroxide dosing device for chemical cleaning of power plant boilers according to claim 4, characterized in that: The connecting component (4) includes a second rectangular strip (401) hinged to the outer wall of the driving component (3). One end of the second rectangular strip (401) away from the driving component (3) is hinged to one side of the third rectangular strip (501). A storage groove (402) is provided on the second rectangular strip (401) through which the second rectangular strip (401) passes. The limiting member (6) passes through the interior of the storage groove (402). A guide rod (403) is provided inside the storage groove (402). The outer wall of the guide rod (403) is slidably connected to the inner wall of the limiting member (6).

7. A hydrogen peroxide dosing device for chemical cleaning of power plant boilers according to claim 6, characterized in that: The limiting member (6) includes a movable plate (601) located on the upper surface of the second rectangular strip (401). A connecting plate (602) is fixedly connected to the lower surface of one end of the movable plate (601). The inner wall of the connecting plate (602) is slidably connected to the outer wall of the guide rod (403). A limiting strip (603) is fixedly connected to the lower end face of the connecting plate (602). The end of the limiting strip (603) away from the connecting plate (602) is movably inserted into the inner wall of the limiting block (7). A handle (604) is fixedly connected to the upper surface of the movable plate (601). A spring (605) is elastically connected to the side of the connecting plate (602) away from the limiting block (7). The guide rod (403) passes through the interior of the spring (605).

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