A pump house with pre-pump filtering function

Abstract

The utility model relates to a pump house technical field, the utility model provides a kind of pump house with pump front filter function, including rotary plate, pull plate, firm component, press down fixed component and retract component, rotary paper is set on support frame by rotating component, pull plate is slidably installed in rotary plate, firm component is set on the side of pull plate and pump house body, for firming pump front filter device, press down fixed component is set on firm component, two retract components are all set on firm component, for retracting pump front filter device.The utility model provides a kind of pump house with pump front filter function, by means of rotary plate, pull plate, firm component, press down fixed component and retract component, solve the technical problem that it is more troublesome to retrieve when placing pump front filter device into river and taking it on shore in prior art, device can float far under the impact of river flow, so as to retrieve.

Description

Technical Field

[0001] This utility model relates to the field of pump room technology, specifically to a pump room with a pre-pump filtration function. Background Technology

[0002] A pump house is a building that houses water pumps, power units, and auxiliary equipment. It is the main structure of a pumping station. In the field of farmland irrigation, pump houses are usually built next to water sources (such as rivers and lakes) to absorb water from the river and then irrigate the farmland, which is more labor-saving. However, because there are many impurities or weeds in rivers and lakes, the impurities will be absorbed along with the water during the absorption process, making it difficult to irrigate the farmland effectively.

[0003] Therefore, when absorbing water, the pre-pump filter is usually connected to the water pump in the pump house through a connecting pipe and then placed in the river. When absorbing water, the water and impurities can first pass through the pre-pump filter to filter the impurities, and then the water is absorbed into the water pump and then used to irrigate the farmland.

[0004] When filtering impurities, the pre-pump filter is placed in the river and floated on the river by a float plate to prevent it from sinking. However, after use, when it is necessary to take the device ashore, the device may float far from the shore due to the impact of the river current, making it more troublesome to retrieve. Utility Model Content

[0005] To overcome the above-mentioned defects, the present invention provides a pump house with a pre-pump filtration function, which solves the technical problem in the prior art that when the pre-pump filtration device is placed in a river, it may float far away under the impact of the river current when it is taken ashore, making it difficult to retrieve.

[0006] According to one aspect, at least one embodiment of the present invention provides a pump house with a pre-pump filtration function, including a pump house body and a pre-pump filtration device. The pre-pump filtration device is mounted on a support frame with a float plate, and the pump house body is composed of a detachable steel structure or a steel-wood structure. The pre-pump filtration device is located on the inlet pipe and outside the pump house body. The pre-pump filtration device includes an automatically rotating filter housing and a power turbine water chamber installed inside the automatically rotating filter housing. The automatically rotating filter housing is provided with a high-pressure nozzle for backwashing. It also includes a rotating plate, a pulling plate, a stabilizing component, a pressing and fixing component, and a retraction component. The rotating plate is mounted on the support frame via the rotating component. The pulling plate is slidably mounted inside the rotating plate. The stabilizing component is located on the side of the pulling plate and the pump house body to stabilize the pre-pump filtration device. The pressing and fixing component is located on the stabilizing component to fix the pulling plate on the stabilizing component. Two retraction components are provided, both of which are located on the stabilizing component, for retracting the pre-pump filtration device.

[0007] Furthermore, the pump house body is equipped with a water-fertilizer mixing system and a pumping system. The pumping system includes a pre-pump backwashing filter and a water pump. The water pump's inlet is connected to the pre-pump backwashing filter via a negative pressure threaded pipe and is also connected to the fertilizer mixing tank via a pipeline. The water-fertilizer mixing system is located within the pump house body, and its outlet is connected to the main irrigation pipeline. It includes a three-way controller, a disc filter, a fertilizer applicator, a fertilizer mixing tank, and a fertilizer conveyor. The water pump's outlet is connected to the three-way controller, which is also connected to the disc filter. The fertilizer mixing tank is connected to the water pump via an inlet pipe and to the fertilizer applicator via a fertilizer delivery pipeline. The fertilizer mixing tank is equipped with a mixing device, and the fertilizer conveyor is used in conjunction with the fertilizer mixing tank.

[0008] Furthermore, the rotating assembly includes a mounting plate and a rotating shaft. Two mounting plates are fixedly mounted on the top of the support frame, the rotating shaft is rotatably mounted between the two mounting plates, and the rotating plates are fixedly mounted on the side of the rotating shaft.

[0009] Furthermore, the stabilizing component includes a stabilizing block, a support plate, a stabilizing rod, and a hook assembly. The stabilizing block is placed on the side of the pump house body, and two support plates are fixedly installed on the top of the stabilizing block. The stabilizing rod is fixedly installed between the two support plates, and the hook assembly is disposed on the side of the pulling plate.

[0010] Furthermore, the hook assembly includes a connecting frame, a rotating shaft, and a hook bracket. The connecting frames are fixedly installed on both sides of the pulling plate. The rotating shaft is rotatably installed between the two connecting frames. Two hook brackets are provided, and both hook brackets are fixedly installed on the side of the rotating shaft.

[0011] Furthermore, the pressing and fixing assembly includes a sliding cylinder and a sliding frame. The sliding cylinder is fixedly installed on the side of both support plates. The sliding frame is U-shaped and is slidably installed through the two sliding cylinders.

[0012] Furthermore, the recovery assembly includes a winding reel, a winding rope, a fixing rod, and a recovery hook. The winding reel is rotatably mounted on the side of the stabilizing block via a placement frame, and a throttle is coaxially fixedly mounted on the winding reel. The winding rope is wound around the winding reel. The fixing rod is fixedly mounted on the side of the pulling plate, and a fixing frame is fixedly mounted on the side of the fixing rod. The recovery hook is fixedly mounted on one end of the winding rope.

[0013] Furthermore, the top of the hook frame is provided with a groove that matches the bottom of the sliding frame.

[0014] Furthermore, through slots are provided on both sides of the rotating plate, and limit rods are fixedly installed on both sides of the pulling plate, with the two limit rods passing through the two through slots respectively.

[0015] The beneficial effects of this utility model are as follows: In this invention, when filtering water, the pre-pump filter is first placed in the river. After placement, the pulling plate is secured to the bank by a stabilizing component. If the pre-pump filter floats with the river, the pulling plate can slide relative to the rotating plate, so that the pre-pump filter can be pulled even when floating and will not float too far. After the water is sucked up, the staff can pull the pre-pump filter back to the bank by using the retraction component. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2This is a schematic diagram showing the structure of the rotating plate, pulling plate, rotating assembly, stabilizing assembly and pressing fixing assembly of this utility model. Figure 3 This is a schematic diagram of the structure of the rotating plate and the retraction assembly of this utility model. Figure 4 This is a schematic diagram of the structure of the pre-pump filter device, float plate and support frame of this utility model. Figure 5 This is a partial sectional view of the pump house body of this utility model; Figure 6 This is a schematic diagram of the structure of the rotating plate, pulling plate and limiting rod of this utility model.

[0018] In the diagram: 1. Pump house body; 2. Pre-pump filter; 3. Float; 4. Support frame; 5. Rotating plate; 6. Pulling plate; 7. Mounting plate; 8. Rotating shaft; 9. Stabilizing block; 10. Support plate; 11. Stabilizing rod; 12. Connecting frame; 13. Rotating shaft; 14. Hook frame; 15. Sliding cylinder; 16. Sliding frame; 17. Winding reel; 18. Winding rope; 19. Fixing rod; 20. Recovery hook; 21. Limiting rod; 22. Fixing frame. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0020] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0021] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] like Figures 1-6 As shown, this invention illustrates a pump house with pre-pump filtration function in one embodiment of the present invention. It includes a pump house body 1 and a pre-pump filtration device 2. The pre-pump filtration device 2 is mounted on a support frame 4 with a float plate 3. The pump house body 1 is composed of a detachable steel structure or a steel-wood structure. The pre-pump filtration device 2 is located on the inlet pipe and outside the pump house body 1. The pre-pump filtration device 2 includes an automatically rotating filter housing and a power turbine water chamber installed inside the filter housing. It also includes a high-pressure nozzle for backwashing, a rotating plate 5, a pulling plate 6, a stabilizing component, a pressing and fixing component, and a retraction component. The rotating plate 5 is mounted on the support frame 4 via the rotating component. The pulling plate 6 is slidably mounted inside the rotating plate 5. The stabilizing component is located on the sides of the pulling plate 6 and the pump house body 1 to stabilize the pre-pump filtration device 2. The pressing and fixing component is located on the stabilizing component to fix the pulling plate 6 to the stabilizing component. Two retraction components are provided, both located on the stabilizing component, for retracting the pre-pump filtration device 2.

[0026] like Figure 4 As shown, when irrigating the river with water, the pre-pump filter device 2 is first connected to the water pump in the pump house through a connecting pipe. Then, the staff can use tools or a transport vehicle to place the pre-pump filter device 2 into the river. Under the action of the float plate 3, the pre-pump filter device 2 can float in the river and is located inside the river.

[0027] like Figure 2 As shown, prior to this, the pre-pump filter 2 can be connected to the bank via the rotating assembly and the stabilizing assembly, preventing the pre-pump filter 2 from being washed away when the river is turbulent. The rotating assembly includes a mounting plate 7 and a rotating shaft 8. Two mounting plates 7 are fixedly installed on the top of the support frame 4. The rotating shaft 8 is rotatably installed between the two mounting plates 7, and the rotating plate 5 is fixedly installed on the side of the rotating shaft 8. The stabilizing assembly includes a stabilizing block 9, a support plate 10, a stabilizing rod 11, and a hook assembly. The stabilizing block 9 is placed on the side of the pump house body 1. Two support plates 10 are fixedly installed on the top of the stabilizing block 9. The stabilizing rod 11 is fixedly installed between the two support plates 10. The hook assembly is set on the side of the pulling plate 6. The hook assembly includes a connecting frame 12, a rotating shaft 13, and a hook frame 14. Connecting frames 12 are fixedly installed on both sides of the pulling plate 6. The rotating shaft 13 is rotatably installed between the two connecting frames 12. There are two hook frames 14, and both hook frames 14 are fixedly installed on the side of the rotating shaft 13.

[0028] Specifically, the staff rotates the rotating plate 5 and the pulling plate 6 through the rotating shaft 8, causing them to rush towards the stabilizing block 9 placed on the shore. Then, the rotating shaft 13 is rotated to hook the hook frame 14 onto the stabilizing rod 11. The stabilizing block 9 is placed on the side of the pump house body 1 and is a heavy object, which can fix the pulling plate 6 and the rotating plate 5.

[0029] like Figure 2 and Figure 6 As shown, after hooking, the hook frame 14 can be fixed by the pressing and fixing assembly to prevent it from moving back and forth and detaching from the stabilizing rod 11. The pressing and fixing assembly includes a sliding cylinder 15 and a sliding frame 16. Sliding cylinders 15 are fixedly installed on the sides of both support plates 10. The sliding frame 16 is U-shaped and is slidably installed through the two sliding cylinders 15. Specifically, because the top of the hook frame 14 has a groove that matches the bottom of the sliding frame 16, the sliding frame 16 slides down, inserting the top of the sliding frame 16 into the groove of the hook frame 14, thereby limiting the hook frame 14 and preventing it from moving away from the stabilizing rod 11. After the stabilizing rod 11 is disengaged, the pre-pump filter 2 can be pulled. When the pre-pump filter 2 slides forward, the rotating plate 5 and the pulling plate 6 can move relative to each other, thereby moving the pre-pump filter 2 forward. When adsorbing water sources in different river areas, the pre-pump filter 2 can also be pushed forward. Since the rotating plate 5 has through slots on both sides and the pulling plate 6 has limit rods 21 fixedly installed on both sides, with the two limit rods 21 passing through the two through slots respectively, when the pulling plate 6 is about to slide out of the rotating plate 5, the limit rods 21 contact the side of the fixed rod 19, preventing the pulling plate 6 from desulfurizing the rotating plate 5.

[0030] like Figure 3As shown, after water absorption is complete, the pre-pump filter 2 can be retrieved using the retrieval assembly. The retrieval assembly includes a winding wheel 17, a winding rope 18, a fixing rod 19, and a retrieval hook 20. The winding wheel 17 is rotatably mounted on the side of the stabilizing block 9 via a placement frame, and a handle is coaxially fixed to the winding wheel 17. The winding rope 18 is wound around the winding wheel 17. The fixing rod 19 is fixedly mounted on the side of the pulling plate 6, and a fixing frame 22 is fixedly mounted on the side of the fixing rod 19. The retrieval hook 20 is fixedly mounted on one end of the winding rope 18. Specifically, before the pre-pump filter 2 is submerged in water, the retrieval hook 20 can be hooked onto the fixing frame 22. When retrieval is required, the operator can turn the handle to rotate the winding wheel 17, causing the winding rope 18 to wind around the winding wheel 17, thereby pulling the pre-pump filter 2 back. Furthermore, if the pre-pump filter 2 moves forward during water absorption, it can also move the winding rope 18 forward, causing the winding wheel 17 to rotate synchronously.

[0031] Working principle: When adsorbing water, the operator first rotates the rotating plate 5 and the pulling plate 6 through the rotating shaft 8, causing them to rush towards the stabilizing block 9 placed on the shore. Then, the rotating shaft 13 is rotated to hook the hook frame 14 onto the stabilizing rod 11. The stabilizing block 9 is placed on the side of the pump house body 1 and is a weight, thus fixing the pulling plate 6 and the rotating plate 5. Then, the sliding frame 16 slides down and the top of the sliding frame 16 is inserted into the groove of the hook frame 14, thereby limiting the hook frame 14 and preventing it from detaching from the stabilizing rod 11. Then, the water is adsorbed. After adsorption is completed, the operator can turn the handle to rotate the winding wheel 17, causing the winding rope 18 to wind around the winding wheel 17. At the same time, the pre-pump filter device 2 is pulled back. When adsorbing water, if the pre-pump filter device 2 moves forward, it can also move the winding rope 18 forward, causing the winding wheel 17 to rotate synchronously.

[0032] It should be added that during water adsorption, the water pump inside the pump house 1 is activated, drawing water from the river into the pump house 1 through a connecting pipe via a pre-pump filter device 2. The connecting pipe is a flexible hose. A filter screen is rotatably installed inside the pre-pump filter device 2, and several nozzles are fixedly installed inside the device. These nozzles are connected to the water supply pipe inside the pump house 1. A portion of the adsorbed water can flow back into the nozzles to spray water onto the filter screen. As the river flows through the pre-pump filter device 2, impurities are blocked by the filter screen, allowing the water to pass through. The water enters the pump house body 1 through the connecting pipe, and when the filter screen is filtering, the water sprayed from the nozzle can spray the filter screen, thereby avoiding impurities from adhering to the filter holes for a long time and affecting subsequent filtration. It should also be noted that the pre-pump filter device 2 is set on the water inlet pipe of the water pump. The pre-pump filter device 2 includes an automatic rotating filter shell and a power turbine water chamber installed in the filter shell. The nozzle in the filter shell is a high-pressure nozzle for backwashing. The filter screen of the pre-pump filter device 2 is made of nylon or stainless steel. The pre-pump filter device 2 is also equipped with a hydrodynamic automatic backwashing system.

[0033] like Figure 5 As shown, the pump house body 1 is equipped with a water-fertilizer mixing system and a pumping system. The water-fertilizer mixing system, located inside the pump house body 1, includes a powerful self-priming pump or axial flow pump / centrifugal pump, a three-way controller, a disc filter, a fertilizer applicator, a fertilizer mixing tank, a fertilizer conveyor, and a pre-pump filter 2 connected to the water pump via a negative pressure threaded pipe. The water pump is connected to the three-way controller, which is connected to the disc filter. The fertilizer mixing tank is connected via an inlet pipe, and the fertilizer mixing tank is connected to the fertilizer applicator via a fertilizer delivery pipe. The fertilizer mixing tank is equipped with a mixing device. The fertilizer conveyor is used in conjunction with the fertilizer mixing tank. The water pump's inlet is connected via a pipe... The pre-pump filter 2 is connected to the outlet end of the three-way controller. The disc filter is also connected to the three-way controller and to the fertilizer mixing tank via a pipeline. The outlet end of the integrated water and fertilizer equipment is connected to the main irrigation pipeline. The mixing device is a paddle mixer or a spiral mixer. The drive motor of the mixer is electrically connected to the electrical control box, which is located on the inner wall of the pump house body 1. The water pump is a high-power self-priming pump, centrifugal pump, or plunger pump. The diameter of the inlet pipe of the water pump is larger than the diameter of the outlet pipe. A check valve is installed on the pipeline, and a flow meter and an electric regulating valve are installed on each pipeline. The flow meter and the electric regulating valve are electrically connected to the electrical control box.

[0034] It should be added that the pump house body 1 forms an equipment installation space inside. The pump house body 1 includes a detachable steel structure frame and a protective plate covering the frame. The pump house body 1 is equipped with an inspection door, a security door, an emergency door, and a ventilation structure for equipment maintenance. The security door is installed on the front of the pump house body 1. The upper and lower corrugated or corrugated plates on both sides of the security door are horizontally designed with corresponding flat surfaces in the middle for attaching the pump house body 1's appearance design and decorative promotional text. The inspection door on both sides and the inspection opening on the side of the pump house body 1 are flat. In order to facilitate the pasting of the pump station's operating instructions and related information, the emergency door on the side of the pump house body 1 is designed as a detachable component, which facilitates the pump station's transportation, installation, and commissioning. The outer side of the pump house body 1 is equipped with lifting lugs, and the bottom of the pump house body is equipped with leveling bolts. The detachable steel structure frame and the protective plate covering the frame can be reused repeatedly and used in multiple locations.

[0035] Furthermore, the frame of the pump house body 1 is made of hot-dip galvanized steel structure, the bottom of the pump house body 1 is equipped with shock-absorbing beams, the maintenance door of the pump house body 1 is an open structure, the security door is a single-opening structure, the emergency door is a hook locking structure, and the ventilation structure is installed at the top of the pump house body 1, using a non-powered exhaust fan and louvers installed at the bottom.

[0036] 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 pump house with pre-pump filtration function, comprising a pump house body (1) and a pre-pump filtration device (2), wherein the pre-pump filtration device (2) is mounted on a support frame (4) with a float plate (3), and the pump house body (1) is composed of a detachable steel structure or a steel-wood structure, characterized in that, The pre-pump filtration device (2) is installed on the inlet pipe and located outside the pump house body (1). The pre-pump filtration device (2) includes an automatic rotating filter housing and a power turbine water chamber installed inside the automatic rotating filter housing. The automatic rotating filter housing is provided with a high-pressure nozzle for backwashing. It also includes: A rotating plate (5) is mounted on the support frame (4) via a rotating assembly; A pull plate (6) is slidably installed inside the rotating plate (5); A stabilizing component is provided on the side of the pull plate (6) and the pump house body (1) to stabilize the pre-pump filter device (2); A pressing and fixing component is disposed on the stabilizing component and is used to fix the pull plate (6) on the stabilizing component; The retraction component is provided in two parts, both of which are disposed on the stabilizing component, for retracting the pre-pump filter device (2).

2. A pump house with pre-pump filtration function according to claim 1, characterized in that, The pump house body (1) is equipped with a water and fertilizer mixing system and a pumping system. The pumping system includes a pre-pump backwash filter and a water pump. The water inlet of the water pump is connected to the pre-pump backwash filter through a negative pressure threaded pipe and is connected to the fertilizer mixing tank by a pipeline. The water-fertilizer mixing system is located inside the pump house body (1), with the outlet end connected to the irrigation main pipeline. It includes a three-way controller, a disc filter, a fertilizer applicator, a fertilizer mixing tank, and a fertilizer conveyor. The outlet end of the water pump is connected to the three-way controller, and the three-way controller is connected to the disc filter. The fertilizer mixing tank is connected to the water pump through an inlet pipe, and the fertilizer mixing tank is connected to the fertilizer applicator through a fertilizer conveying pipe. The fertilizer mixing tank is equipped with a stirring device, and the fertilizer conveyor is used in conjunction with the fertilizer mixing tank.

3. A pump house with pre-pump filtration function according to claim 2, characterized in that, The rotating assembly includes: Mounting plate (7), two mounting plates (7) are fixedly installed on the top of the support frame (4); A rotating shaft (8) is rotatably mounted between two mounting plates (7), and the rotating plate (5) is fixedly mounted on the side of the rotating shaft (8).

4. A pump house with pre-pump filtration function according to claim 3, characterized in that, The stabilizing component includes: Stabilizing block (9), the stabilizing block (9) is placed on the side of the pump house body (1); Support plate (10), two of the support plates (10) are fixedly installed on the top of the stabilizing block (9). A stabilizing rod (11) is fixedly installed between the two support plates (10); Hook and pull assembly, which is disposed on the side of the pull plate (6).

5. A pump house with pre-pump filtration function according to claim 4, characterized in that, The hook assembly includes: Connecting frame (12), both sides of the pull plate (6) are fixedly installed with the connecting frame (12); A rotating shaft (13) is rotatably mounted between the two connecting frames (12); Two hook frames (14) are provided, and both hook frames (14) are fixedly installed on the side of the rotating shaft (13).

6. A pump house with pre-pump filtration function according to claim 5, characterized in that, The pressing and fixing assembly includes: Sliding cylinder (15), the sliding cylinder (15) is fixedly installed on the sides of both support plates (10); The sliding frame (16) is U-shaped and is slidably mounted through the two sliding cylinders (15).

7. A pump house with pre-pump filtration function according to claim 6, characterized in that, The recovery component includes: The winding wheel (17) is rotatably mounted on the side of the stabilizing block (9) via a placement frame, and the winding wheel (17) is coaxially fixedly mounted with a throttle handle; A winding rope (18) is wound around the winding reel (17); A fixing rod (19) is fixedly installed on the side of the pull plate (6), and a fixing bracket (22) is fixedly installed on the side of the fixing rod (19). A recovery hook (20) is fixedly installed at one end of the winding rope (18).

8. A pump house with pre-pump filtration function according to claim 6, characterized in that, The top of the hook frame (14) is provided with a groove that matches the bottom of the sliding frame (16).

9. A pump house with pre-pump filtration function according to claim 1, characterized in that, Both sides of the rotating plate (5) are provided with through slots, and the two sides of the pulling plate (6) are fixedly installed with limit rods (21), and the two limit rods (21) pass through the two through slots respectively.

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