Submersible sewage pump for sludge treatment

Abstract

The utility model relates to the technical field of submersible sewage pumps, and discloses a sludge treatment submersible sewage pump which comprises a main body assembly and a sewage pump body, a base is fixed to one side of the sewage pump body, a communicating pipe is fixed to one side of the sewage pump body, and a first clamping plate is connected to one side of the communicating pipe through a bolt; the base comprises a second clamping plate arranged on one side of the first clamping plate; the sealing assembly is arranged on one side of the first clamping plate and comprises a sealing piece, an auxiliary piece is arranged on the sealing piece, and the sealing piece comprises a fixing ring fixed to one side of the first clamping plate. The coupling device has the advantages that by additionally arranging the sealing structure on one side, when the sewage pump is coupled with the base, the additional sealing ring enters the through hole in the base and forms double sealing with the original rubber sealing piece of the coupling device, and meanwhile when the sewage pump is separated from the base, the sealing ring retreats back to the through hole of the drainage pump, equipment disassembly is not affected, and the service life of the drainage pump is prolonged. Therefore, the sealing reliability of connection is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to submersible sewage pump technical field, especially a sludge treatment submersible sewage pump. BACKGROUND

[0002] In the field of sewage treatment, the submersible sewage pump is usually connected with the base through the coupling device to facilitate installation and maintenance, and the traditional coupling configuration mainly relies on the rubber sealing element to realize the sealing between the sewage pump and the base. The mechanical vibration generated during the operation of the sewage pump will continuously impact the sealing element at the coupling interface, causing the sealing element to wear, displace or accelerate aging, and further causing medium leakage. Relying only on the sealing element at the coupling interface may not guarantee the sealing between the sewage pump and the base. SUMMARY

[0003] In view of the above and / or existing problems in the sludge treatment submersible sewage pump, the utility model is proposed.

[0004] Therefore, the problem to be solved by the utility model is that relying only on the sealing element at the coupling interface cannot ensure the sealing between the sewage pump and the base.

[0005] To solve the above technical problems, the utility model provides the following technical scheme: a sludge treatment submersible sewage pump, comprising a main body assembly, including a sewage pump, the sewage pump is fixed with a base on one side, the sewage pump is fixed with a communication pipe on one side, the communication pipe is bolted with a first clamping plate on one side, the base includes a second clamping plate arranged on one side of the first clamping plate.

[0006] A sealing assembly is arranged on one side of the first clamping plate and includes a sealing element, an auxiliary element is arranged on the sealing element, the sealing element includes a fixing ring fixed on one side of the first clamping plate, and a sealing plate is fixed on one side of the fixing ring.

[0007] A moving groove is formed in the fixing ring, the auxiliary element includes a moving ring arranged in the moving groove, a sealing ring is fixed on the moving ring, and a push block and a baffle are fixed on one side of the moving ring.

[0008] As a preferred scheme of the sludge treatment submersible sewage pump of the utility model, a cavity is formed in the first clamping plate, a sleeve is arranged in the cavity, an extrusion block is fixed on the sleeve, a circular ring is arranged on one side of the sleeve, a lifting ring is arranged on one side of the circular ring, and a lifting column is fixed on the top of the lifting ring.

[0009] As a preferred scheme of the sludge treatment submersible sewage pump, the first clamping plate is fixed with a rectangular block, a moving plate is arranged on the rectangular block, the moving plate is fixed with the lifting column, a first spring is fixed on one side of the moving plate, and the other end of the first spring is fixed on the first clamping plate.

[0010] As a preferred scheme of the sludge treatment submersible sewage pump, the first clamping plate is fixed with a rectangular block, a moving plate is arranged on the rectangular block, the moving plate is fixed with the lifting column, a first spring is fixed on one side of the moving plate, and the other end of the first spring is fixed on the first clamping plate.

[0011] As a preferred scheme of the sludge treatment submersible sewage pump, the first clamping plate is fixed with a rectangular block, a moving plate is arranged on the rectangular block, the moving plate is fixed with the lifting column, a first spring is fixed on one side of the moving plate, and the other end of the first spring is fixed on the first clamping plate.

[0012] As a preferred scheme of the sludge treatment submersible sewage pump, the first clamping plate is fixed with a rectangular block, a moving plate is arranged on the rectangular block, the moving plate is fixed with the lifting column, a first spring is fixed on one side of the moving plate, and the other end of the first spring is fixed on the first clamping plate.

[0013] As a preferred scheme of the sludge treatment submersible sewage pump, the first clamping plate is fixed with a rectangular block, a moving plate is arranged on the rectangular block, the moving plate is fixed with the lifting column, a first spring is fixed on one side of the moving plate, and the other end of the first spring is fixed on the first clamping plate.

[0014] As a preferred scheme of the sludge treatment submersible sewage pump, the first clamping plate is fixed with a rectangular block, a moving plate is arranged on the rectangular block, the moving plate is fixed with the lifting column, a first spring is fixed on one side of the moving plate, and the other end of the first spring is fixed on the first clamping plate.

[0015] As a preferred scheme of the sludge treatment submersible sewage pump, the first clamping plate is fixed with a rectangular block, a moving plate is arranged on the rectangular block, the moving plate is fixed with the lifting column, a first spring is fixed on one side of the moving plate, and the other end of the first spring is fixed on the first clamping plate.

[0016] As a preferred scheme of the sludge treatment submersible sewage pump, the first clamping plate is fixed with a rectangular block, a moving plate is arranged on the rectangular block, the moving plate is fixed with the lifting column, a first spring is fixed on one side of the moving plate, and the other end of the first spring is fixed on the first clamping plate.

[0017] The utility model has the advantages that: through the additional one side sealing structure, when the sewage pump and the base are coupled, the additional sealing ring will enter the through hole in the base and form double sealing with the original rubber sealing element of the coupling device, and when the sewage pump and the base are separated, the sealing ring will retreat from the through hole of the sewage pump, without affecting the equipment disassembly, so that the sealing reliability of the connection is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0019] Figure 1 This is a structural diagram of a submersible sewage pump for sludge treatment.

[0020] Figure 2 Submersible sewage pumps for sludge treatment Figure 1 Enlarged view of the structure at point A in the middle.

[0021] Figure 3 A structural diagram of the first cassette plate for a submersible sewage pump used for sludge treatment.

[0022] Figure 4 A cross-sectional view of the first chuck of a submersible sewage pump for sludge treatment.

[0023] Figure 5 Submersible sewage pumps for sludge treatment Figure 4 Enlarged view of the structure at point B in the middle.

[0024] Figure 6 Submersible sewage pumps for sludge treatment Figure 4 Enlarged view of the structure at point C.

[0025] Figure 7 A diagram showing the sleeve structure of a submersible sewage pump for sludge treatment.

[0026] Figure 8 Diagram of the moving ring structure of a submersible sewage pump for sludge treatment.

[0027] Figure 9 A cross-sectional structural diagram of the sleeve of a submersible sewage pump for sludge treatment.

[0028] Figure 10 Submersible sewage pumps for sludge treatment Figure 9 Enlarged view of the structure at point D. Detailed Implementation

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0032] Example 1

[0033] Reference Figures 1-5 This is the first embodiment of the present invention, which provides a submersible sewage pump for sludge treatment. The submersible sewage pump for sludge treatment includes a main component 100, including a sewage pump 101. A base 102 is fixed to one side of the sewage pump 101. It is a device for conveying sewage and wastewater containing impurities such as solid particles and fibers. Before the sewage tank is connected to the sewage tank, the base 102 is fixed to the bottom of the sewage treatment tank by bolts. During installation, the sewage pump 101 only needs to be connected to the base 102 along a specific track or guide device to achieve a quick connection between the sewage pump 101 and the outlet pipeline, etc., without complicated alignment and tightening operations. After installation, sewage discharge can begin. This is the prior art, and this solution will not be described in detail. Moreover, those skilled in the art can clearly understand the working principle.

[0034] A connecting pipe 103 is fixed to one side of the sewage pump 101. A first clamping plate 104 is bolted to one side of the connecting pipe 103. The base 102 includes a second clamping plate 105 disposed on one side of the first clamping plate 104. A first clamping block 104-2 is fixed on the first clamping plate 104, and a second clamping block 105-1 is fixed on the second clamping plate 105. Both clamping blocks have inclined slopes. When the two clamping blocks are engaged, and the first clamping plate 104 and the second clamping block 105-1 are fully fitted together, coupling can be achieved. This is existing technology, and this solution will not be described in detail.

[0035] The sealing assembly 200 is disposed on one side of the first card plate 104 and includes a sealing element 201. The sealing element 201 provides initial sealing at the connection between the sewage pump 101 and the base 102. An auxiliary element 202 is provided on the sealing element 201, which can further improve the sealing performance.

[0036] The sealing element 201 includes a fixing ring 2011 fixed to one side of the first clamping plate 104. A sealing plate 2012 is fixed to one side of the fixing ring 2011. The sealing plate 2012 has a certain tilt angle and is the original sealing structure of the base 102. This is the prior art, and this solution will not be described in detail. After the sewage pump 101 moves to the designated position, the sealing plate 2012 will fit tightly with the second clamping plate 105.

[0037] The fixed ring 2011 has a movable groove 2011-1. The auxiliary component 202 includes a movable ring 2021 disposed in the movable groove 2011-1. A sealing ring 2022 is fixed on the movable ring 2021. A push block 2023 and a baffle 2024 are fixed on one side of the movable ring 2021. The push block 2023 is used to push the movable ring 2021 to move. The movement of the movable ring 2021 can drive the sealing ring 2022 to move. The sealing ring 2022 is used to enhance the seal at the connection between the sewage pump 101 and the base 102. The baffle 2024 is used to block the movable groove 2011-1 after the movable ring 2021 to prevent sewage from entering the push block 2023.

[0038] Both the first card plate 104 and the second card plate 105 are provided with through holes. During the descent of the sewage pump 101, the sealing ring 2022 will be located in the through hole of the first card plate 104. After the sewage pump 101 descends to the designated position, the sealing ring 2022 will be triggered and move into the inner wall of the second card plate 105, so that one end face of the sealing ring 2022 fits against the inner wall of the second card plate 105, thereby increasing the sealing performance. Together with the sealing plate 2012, it seals the connection between the sewage pump 101 and the base 102. One end of the sealing ring 2022 is inclined, which facilitates the movement of the sealing ring 2022 into the inner wall of the second card plate 105.

[0039] Example 2

[0040] Reference Figures 3-10 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0041] Specifically, a chamber 104-1 is provided in the first card plate 104, a sleeve 2025 is provided in the chamber 104-1, and a pressing block 2026 is fixed on the sleeve 2025. The sleeve 2025 is used to drive the pressing block 2026 to move vertically.

[0042] One end of the extrusion block 2026 is inclined, and one end of the push block 2023 is correspondingly inclined. When the extrusion block 2026 moves downward, the inclined surface of the extrusion block 2026 presses against the inclined surface of the push block 2023, causing the push block 2023 to move away from the sleeve 2025, thereby causing the sealing ring 2022 to move into the inner wall of the second clamping plate 105 and fit against the inner wall of the second clamping plate 105.

[0043] During the downward movement of the sewage pump 101, the sleeve 2025 is located at the upper part of the chamber 104-1. The states shown in the figure are all during the downward movement of the sewage pump 101.

[0044] A ring 2027 is provided on one side of the sleeve 2025. The ring 2027 is fixed to the sleeve 2025 by a connecting rod 20216. There are two connecting rods 20216. The ring 2027 is used to drive the sleeve 2025 to move.

[0045] A lifting ring 2028 is provided on one side of the ring 2027, and a lifting column 2029 is fixed on the top of the lifting ring 2028. The movement of the sleeve 2025 can be triggered by the two of them.

[0046] Specifically, a rectangular block 20210 is fixed on the first card plate 104. A movable plate 20211 is fitted over the rectangular block 20210. The movable plate 20211 has a groove corresponding to the rectangular block 20210. The movable plate 20211 is fixed to the lifting column 2029. When the movable plate 20211 moves downward, the lifting column 2029 will move downward synchronously, causing the lifting ring 2028 to move, which in turn causes the sleeve 2025 to move downward, and the sealing ring 2022 to move, thereby improving the sealing performance.

[0047] A first spring 20212 is fixed on one side of the movable plate 20211, and the other end of the first spring 20212 is fixed on the first clamping plate 104. The first spring 20212 applies a continuous pulling force to the movable plate 20211, thereby maintaining the sleeve 2025 in the upper part of the chamber 104-1.

[0048] The first spring 20212 shown in the figure is in an extended state.

[0049] Specifically, a pull rope 106 is fixed to the top of the sewage pump 101. The pull rope 106 is quite long, but not fully shown in the figure. A branch rope 107 is fixed to the pull rope 106. One end of the branch rope 107 is fixed to the moving plate 20211. When connecting the sewage pump 101 to the base 102, the sewage pump 101 is hoisted using the pull rope 106. During the downward movement of the sewage pump 101, the pull rope 106 will be in a taut state under the action of gravity, and the branch rope 107 will also be in a taut state, thereby extending the first spring 20212 and placing the moving plate 20211 at its highest position.

[0050] Once the sewage pump 101 has moved to the designated position, it can no longer move. The pull rope 106 will be loosened, and the branch rope 107 will also be loosened, thus restoring the first spring 20212 and applying a downward pulling force to the moving plate 20211, thereby causing the moving plate 20211 to move downward.

[0051] Specifically, the sealing assembly 200 also includes a delay member 203 located within the first card plate 104. The delay member 203 is configured to delay the movement of the sealing ring 2022. The sealing ring 2022 will only move after the sewage pump 101 has moved to the designated position, thereby preventing the sealing ring 2022 from affecting the coupling between the sewage pump 101 and the base 102.

[0052] The delay component 203 includes a second spring 2031 fixed between the ring 2027 and the lifting ring 2028. A piston 2032 is provided inside the sleeve 2025. A circular plate 2033 is fixed on the piston 2032. The two are fixed by a piston rod. The circular plate 2033 is fixed inside the first clamping plate 104. The position of the piston 2032 is fixed. When the sleeve 2025 moves vertically, it will move relative to the piston 2032, which is the same as the principle of "piston movement".

[0053] When the movable plate 20211 moves downward, the lifting ring 2028 will also move downward, and the second spring 2031 will transmit thrust, thereby pushing the ring 2027 to move, which in turn causes the sleeve 2025 to move downward.

[0054] Specifically, the bottom of the sleeve 2025 has a large hole 2025-1, and a rotating plate 2034 is hinged to the bottom of the sleeve 2025. A torsion spring 2036 is fixed at the hinge position of the rotating plate 2034. The other end of the torsion spring 2036 is fixed to the component that is fixed to the sleeve 2025 at the hinge position. The torsion spring 2036 is used to ensure that the end face of the rotating plate 2034 is always in contact with the bottom end face of the sleeve 2025 without the action of other external forces. A small hole 2034-1 is opened on the rotating plate 2034.

[0055] When the rotating plate 2034 is in contact with the bottom end face of the sleeve 2025, the sleeve 2025 communicates with the outside world through the small hole 2034-1. Because the small hole 2034-1 is small, when the moving plate 20211 moves downwards, the sleeve 2025 moves downwards while the piston 2032 remains stationary. The piston 2032 will move upwards relative to the sleeve 2025, and the lifting ring 2028 will also move downwards. When the second spring 2031 transmits thrust to the ring 2027, because the small hole 2034-1 is small, the piston 2032 moves while the piston 203... 2. The cavity formed on the side of the sleeve 2025 with the small hole 2034-1 has a large negative pressure, which will resist the movement of the sleeve 2025, and thus make the movement resistance of the circular plate 2033 very large. However, the thrust stored in the second spring 2031 will continue to be applied to the circular plate 2033, so that the circular plate 2033 drives the sleeve 2025 to move at a slow speed with a certain lag. Finally, after the sleeve 2025 moves downward to the limit position, a part of the sealing ring 2022 will fit against the inner wall of the through hole of the second clamping plate 105.

[0056] When the sewage pump 101 is separated from the base 102, the moving plate 20211 moves upward. At this time, due to the change in air pressure and atmospheric pressure, the rotating plate 2034 will open. At this time, the sleeve 2025 will be connected to the outside through the large hole 2025-1. The movement speed of the sleeve 2025 will increase, and finally the sleeve 2025 will move to the initial position at the upper end of the chamber 104-1.

[0057] Example 3

[0058] Reference Figures 1-10 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0059] Specifically, an extension plate 20213 is fixed on the push block 2023, and a third spring 20214 is fixed on one side of the extension plate 20213. The first clamping plate 104 has a groove corresponding to the extension plate 20213. The third spring 20214 is fixed to the inner wall of the groove. Through the cooperation of the third spring 20214 and the extension plate 20213, the original position of the push block 2023 is maintained, and it is used for the reset of the push block 2023. The reset of the push block 2023 can drive the moving ring 2021 and the sealing ring 2022 to reset synchronously.

[0060] Specifically, the elastic force of the third spring 20214 is less than that of the second spring 2031, thereby ensuring that the movement of the sleeve 2025 can drive the push block 2023 and the sealing ring 2022 to move.

[0061] Specifically, the moving ring 2021 has a guide groove 2021-1, and the inner wall of the moving groove 2011-1 is fixed with a guide post 2013. There are multiple guide posts 2013. Through the cooperation between the guide posts 2013 and the guide groove 2021-1, the moving ring 2021 can be moved smoothly within the moving groove 2011-1.

[0062] Specifically, the first spring 20212 is covered with a folding sleeve 20215. The two ends of the folding sleeve 20215 are fixed to the moving plate 20211 and the first clamping plate 104, respectively. The folding sleeve 20215 can be folded to adapt to changes in the distance between the moving plate 20211 and the first clamping plate 104. The folding sleeve 20215 protects the first spring 20212 and prevents mud and sand from affecting the first spring 20212.

[0063] In use, the sewage pump 101 is hoisted by the pull rope 106. During the downward movement of the sewage pump 101, the pull rope 106 will be taut under the action of gravity, and the branch rope 107 will also be taut, thereby extending the first spring 20212 and placing the moving plate 20211 at its highest position. After the sewage pump 101 moves to the designated position, the sealing plate 2012 will fit tightly against the second clamping plate 105, thereby sealing the connection between the sewage pump 101 and the base 102.

[0064] When the sewage pump 101 can no longer move, the pull rope 106 will be loosened, and the branch rope 107 will also be loosened, causing the first spring 20212 to return to its original state. This applies a downward pulling force to the moving plate 20211, causing it to move downwards. The lifting ring 2028 will also move downwards. The second spring 2031 will transmit thrust, pushing the ring 2027 to move. When the piston 2032 moves relative to the sleeve 2025, the cavity formed by the piston 2032 and the side with the small hole 2034-1 has a large negative pressure, which will affect the movement of the sleeve 2025. The resistance makes the movement resistance of the circular plate 2033 very large, but the thrust stored in the second spring 2031 will continue to be applied to the circular plate 2033, thus causing the circular plate 2033 to drive the sleeve 2025 to move at a slow speed with a certain lag. The sleeve 2025 moves downward, thereby causing the inclined surface of the pressing block 2026 to press the inclined surface of the push block 2023, and causing the push block 2023 to move away from the sleeve 2025, thereby causing the sealing ring 2022 to move into the inner wall of the second clamping plate 105 and fit against the inner wall of the second clamping plate 105.

[0065] When the sewage pump 101 is separated from the base 102, the pull rope 106 is pulled to move the moving plate 20211 upward. At this time, due to atmospheric pressure, the rotating plate 2034 will open, and the sleeve 2025 will be connected to the outside through the large hole 2025-1. There will be no great resistance to hinder the movement of the sleeve 2025. At this time, the movement speed of the sleeve 2025 will increase. Finally, the sleeve 2025 moves to the initial position at the upper end of the chamber 104-1, which will not hinder the sewage pump 101 from being pulled upward, so that the sewage pump 101 can be smoothly separated from the base 102.

[0066] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A submersible sewage pump for sludge treatment, characterized in that: include, The main component (100) includes a sewage pump (101), a base (102) fixed on one side of the sewage pump (101), a connecting pipe (103) fixed on one side of the sewage pump (101), a first clamping plate (104) bolted to one side of the connecting pipe (103), and the base (102) includes a second clamping plate (105) disposed on one side of the first clamping plate (104). A sealing assembly (200) is disposed on one side of the first card plate (104) and includes a sealing element (201). An auxiliary element (202) is disposed on the sealing element (201). The sealing element (201) includes a fixing ring (2011) fixed to one side of the first card plate (104), and a sealing plate (2012) is fixed to one side of the fixing ring (2011). The fixed ring (2011) has a movable groove (2011-1), and the auxiliary component (202) includes a movable ring (2021) disposed in the movable groove (2011-1). A sealing ring (2022) is fixed on the movable ring (2021), and a push block (2023) and a baffle (2024) are fixed on one side of the movable ring (2021).

2. The submersible sewage pump for sludge treatment as described in claim 1, characterized in that: The first card plate (104) has a cavity (104-1) inside, a sleeve (2025) is provided in the cavity (104-1), a pressing block (2026) is fixed on the sleeve (2025), a ring (2027) is provided on one side of the sleeve (2025), a lifting ring (2028) is provided on one side of the ring (2027), and a lifting column (2029) is fixed on the top of the lifting ring (2028).

3. The submersible sewage pump for sludge treatment as described in claim 2, characterized in that: A rectangular block (20210) is fixed on the first card plate (104). A movable plate (20211) is fitted over the rectangular block (20210). The movable plate (20211) is fixed to the lifting column (2029). A first spring (20212) is fixed on one side of the movable plate (20211). The other end of the first spring (20212) is fixed to the first card plate (104).

4. The submersible sewage pump for sludge treatment as described in claim 3, characterized in that: A pull rope (106) is fixed to the top of the sewage pump (101), and a branch rope (107) is fixed on the pull rope (106). One end of the branch rope (107) is fixed to the moving plate (20211).

5. The submersible sewage pump for sludge treatment as described in claim 3 or 4, characterized in that: The sealing assembly (200) further includes a delay member (203) located within the first clamping plate (104). The delay member (203) includes a second spring (2031) fixed between the ring (2027) and the lifting ring (2028). A piston (2032) is provided inside the sleeve (2025). A circular plate (2033) is fixed on the piston (2032) and the circular plate (2033) is fixed within the first clamping plate (104).

6. The submersible sewage pump for sludge treatment as described in claim 5, characterized in that: The sleeve (2025) has a large hole (2025-1) at its bottom, and a rotating plate (2034) is hinged to the bottom of the sleeve (2025). The rotating plate (2034) has a small hole (2034-1).

7. The submersible sewage pump for sludge treatment as described in claim 6, characterized in that: An extension plate (20213) is fixed on the push block (2023), and a third spring (20214) is fixed on one side of the extension plate (20213).

8. The submersible sewage pump for sludge treatment as described in claim 7, characterized in that: The elastic force of the third spring (20214) is less than that of the second spring (2031).

9. The submersible sewage pump for sludge treatment as described in claim 7 or 8, characterized in that: The movable ring (2021) is provided with a guide groove (2021-1), and a guide post (2013) is fixed on the inner wall of the movable groove (2011-1).

10. The submersible sewage pump for sludge treatment as described in claim 9, characterized in that: The first spring (20212) is covered with a folding sleeve (20215), and the two ends of the folding sleeve (20215) are fixed to the moving plate (20211) and the first card plate (104) respectively.

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