A wastewater heat recovery heat exchange device

Abstract

The present invention discloses a wastewater heat recovery type heat exchange device, which belongs to the technical field of heat exchange devices, and includes a front main board and a gasket, wherein the internal thread of the front main board is connected with a connecting rod, and the right side surface of the connecting rod is threadedly connected with a rear main board, and fins are arranged between the front main board and the rear main board; and also includes: a water pipe, wherein the water pipe is bolted to the surface of the front main board, and four water pipes are arranged on the surface of the front main board, and the water pipe at the lower right side enters hot water, the water pipe at the upper left side enters cold water, and the water pipe at the lower left side discharges cold water. When the wastewater heat recovery type heat exchange device is working, hot water enters the device through the water pipe at the lower right side, and is discharged from the device from the water pipe at the upper right side, while cold water enters the water pipe at the upper left side, and cold water discharges from the water pipe at the lower left side, thereby completing normal wastewater heat recovery work, and when working, the filter screen inside the lower pipe plays a role in isolating impurities, and prevents impurities from entering the device.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange devices, and in particular to a wastewater heat recovery type heat exchange device. Background Art

[0002] When the heat exchange device is in use, it can realize the heat transfer between two or more fluids, so that their temperatures change. That is, through the heat exchange device, the heat of the hot fluid can be effectively transferred to the cold fluid, which can not only cool down the required position, but also realize heat recovery and avoid energy waste. The heat exchange device is used in many fields, such as computer field, industrial automation field, energy field and medical equipment field;

[0003] For example, a heat exchange device with publication number CN110873453A can more reliably prevent the first fluid from leaking from the first passage through each insertion hole to the outside of the shell. It comprises: a shell, which is divided into a first passage; a heat exchange body, which is accommodated in the first passage, and a second passage is arranged inside the heat exchange body; a supply pipe, which protrudes from the heat exchange body toward the first side wall, and is used to supply the second fluid to the second passage; a discharge pipe, which protrudes from the heat exchange body toward the first side wall, and is used to discharge the second fluid from the second passage; a plurality of insertion holes, which are formed on the first side wall, and are used to make the supply pipe and the discharge pipe protrude to the outside of the shell; an elastic sealing component, which is arranged between the first side wall and the heat exchange body, and is used to cut off the leakage path; and a force-applying component, which applies a force to the elastic sealing component to compress and deform the elastic sealing component;

[0004] Another example is a plate for a heat exchange device with a publication number of CN110621952B, which is used for heat exchange between a first medium and a second medium. The plate has a first heat transfer surface in contact with the first medium and a second heat transfer surface in contact with the second medium. The plate includes an inlet hole for the first medium; an inlet hole for the second medium, and an outlet hole for the first medium. The first heat transfer surface includes a protrusion forming at least one ridge, and the at least one ridge is arranged to divide the heat transfer surface into at least a first area and a second area, the first area is in direct thermal contact with the inlet hole for the second medium, and the second area is not in direct thermal contact with the inlet hole for the second medium. The second area basically surrounds the first area. The inlet hole for the first medium is arranged in the first area, and the outlet hole for the first medium is arranged in the second area. In addition, the at least one ridge forms at least one elongated transfer channel, and the at least one elongated transfer channel is arranged to transfer the first medium from the first area to the second area;

[0005] There is also a heat exchanger for a temperature control device with a publication number of CN1299950A, which is small in size and can increase the heat transfer area of ​​the fluid, has high heat exchange efficiency, can simply increase or decrease the heat transfer area as needed, and has low manufacturing cost. Among them, the plate-shaped heat exchange plates 2, 3 and a number of heat modules 4A are alternately overlapped to form a laminated structure, and the heat exchange plate is a structure in which a flow path forming plate 5 with a labyrinth structure flow path is wrapped by a thin shell 7, and the shell has an inlet hole and an outlet hole, the inlet hole is for the fluid to flow in, and the outlet hole is for the fluid that has passed through the labyrinth structure flow path to flow out. The above-mentioned heat module adopts a Peltier element;

[0006] During use, it is necessary to avoid overpressure and overtemperature of the heat exchange device. Once the temperature is too high, it is necessary to shut down and cool down. However, the heat exchange device in the above application does not have a good high-temperature shutdown function when in use, which may result in untimely treatment of the device and damage to the device. At the same time, during use, when the heat exchange device needs to recover the heat of the wastewater, the wastewater needs to enter the heat exchange device and then be discharged. However, the heat exchange device in the above application does not have a good filtering structure when in use, and there are many impurities in the wastewater. These impurities enter the heat exchange device and affect the subsequent use of the heat exchange device. At the same time, it does not have a quick-disassembly structure, which is inconvenient for quick disassembly, cleaning and maintenance of the heat exchange device.

[0007] In view of the above problems, it is urgent to carry out innovative design based on the original heat exchange device. Summary of the invention

[0008] The object of the present invention is to provide a wastewater heat recovery heat exchange device to solve the problems raised in the above background technology that when in use, it does not have a good high-temperature shutdown function, the device may not be handled in time, the device may be damaged, and when in use, it does not have a good filtering structure, there are many impurities in the wastewater, these impurities enter the interior of the heat exchange device, and affect the subsequent use of the heat exchange device. At the same time, it does not have a quick-disassembly structure, which makes it inconvenient to quickly disassemble, clean and maintain the heat exchange device.

[0009] To achieve the above object, the present invention provides the following technical solution: a wastewater heat recovery type heat exchange device, comprising a front main board and a gasket, wherein the front main board is internally threadedly connected to a connecting rod, and the right side surface of the connecting rod is threadedly connected to a rear main board, and fins are arranged between the front main board and the rear main board, and a nut is threadedly connected to the end position of the connecting rod;

[0010] The surface of the gasket is in contact with the surface of the rear main board, and a support rod is slidably arranged inside the rear main board, and the end of the left side of the support rod is fixedly connected to the right side surface of the front main board;

[0011] A wastewater heat recovery heat exchange device, further comprising:

[0012] Water pipes, the water pipes are bolted to the surface of the front main board, and four water pipes are arranged on the surface of the front main board, the water pipe at the lower right side takes in hot water, the water pipe at the upper right side discharges hot water, the water pipe at the upper left side takes in cold water, and the water pipe at the lower left side discharges cold water;

[0013] A lower connecting pipe, the lower connecting pipe is fixedly connected to the surface of the lower right water pipe, the lower connecting pipe opening is downward, a lap block is fixedly connected to the surface of the lower connecting pipe, and a filter screen is clamped inside the lower connecting pipe;

[0014] A protection frame, wherein the protection frame is fixedly connected to the right side surface of the front mainboard, and a limit plate is fixedly connected to the right side surface of the front mainboard, and an induction expansion member is bonded and connected to the surface of the limit plate;

[0015] A switch, wherein the switch is fixedly connected to the inner wall of the protection frame, and the switch is connected to an external controller via a network signal;

[0016] A connecting pipe is connected to the lower connecting pipe by snap-fitting, and an external connection block is fixedly connected to the surface of the connecting pipe.

[0017] Preferably, a positioning block is fixedly connected to the surface of the filter screen, the inner wall of the lower connecting pipe is concave, and the surface of the lower connecting pipe is provided with positioning grooves corresponding to the positioning blocks one by one.

[0018] Preferably, the limit plates are symmetrically distributed about the center of the inductive expansion member, the lower surface of the inductive expansion member is in contact with the upper surface of the fin, and the surface of the limit plates is fixedly connected to the limit columns.

[0019] Preferably, a movable plate is sleeved and connected to the surface of the limiting column, and a contact rod corresponding to the switch is fixedly connected to the upper surface of the movable plate.

[0020] Preferably, the external connection blocks are symmetrically distributed about the center of the connecting pipe, and the external connection blocks correspond to the overlapping blocks one by one, and the upper surface of the external connection block is fixedly connected with a column.

[0021] Preferably, the column passes through the interior of the lap block, and a slot is provided on the surface of the column, and a long pin corresponding to the slot is slidably provided inside the lap block.

[0022] Preferably, the lower surface of the long pin is inclined, and a slider is fixedly connected to the upper surface of the long pin, and the long pin passes through the interior of the overlapping block.

[0023] Preferably, a return spring having an elastic return function is fixedly connected to the surface of the sliding block, and the other side of the return spring is fixedly connected to the inner wall of the overlapping block.

[0024] Preferably, the end of the long pin is convex downward, and a sliding groove corresponding to the sliding block is provided inside the overlapping block.

[0025] Preferably, a connecting spring having an elastic reset function is fixedly connected to the lower surface of the overlapping block, and a force-bearing plate is fixedly connected to the other side of the connecting spring, and the force-bearing plate is symmetrically distributed about the center of the overlapping block.

[0026] Compared with the prior art, the beneficial effects of the present invention are: the wastewater heat recovery heat exchange device adopts a new structural design, the specific contents of which are as follows:

[0027] (1) When the wastewater heat recovery heat exchange device is working, hot water enters the device through the water pipe at the bottom right side and is discharged from the device through the water pipe at the top right side. At the same time, cold water enters the water pipe at the top left side and is discharged from the water pipe at the bottom left side, thus completing normal wastewater heat recovery work. When working, the filter screen inside the lower pipe plays a role in isolating impurities and preventing impurities from entering the device.

[0028] Furthermore, when the fins are working, the temperature of the fins will rise. When the temperature of the fins rises, the inductive expansion member will expand due to the heat. At this time, the inductive expansion member will push the movable plate and the touch rod to rise under the action of the limit plate. When the temperature exceeds the normal value, the inductive expansion member will expand greatly. At this time, the touch rod will contact the switch, causing the external controller to work, thereby stopping the entire device from working, thereby preventing the overall temperature of the device from continuing to rise, thereby ensuring the overall safety of the device.

[0029] Furthermore, when the movable plate rises, the movable plate will only move in the vertical direction under the action of the limit column, and when the device is not working, the temperature of the fins drops, at which time the inductive expansion member dissipates heat and retracts, and then the movable plate and the touch rod drop under their own gravity, which is convenient for the next use;

[0030] (2) When the wastewater heat recovery heat exchange device is docked with the connecting pipe, the column on the surface of the external connection block is inserted into the inside of the overlap block on the surface of the lower connecting pipe. At this time, the lower surface of the long pin will be pushed, and then the long pin drives the slider to squeeze the reset spring. After the upper surface of the connecting pipe contacts the lower surface of the lower connecting pipe, the slot and the long pin are in the same horizontal direction. At this time, the long pin returns to its original position under the action of the slider and the reset spring, and then the connecting pipe and the lower connecting pipe are docked, which is convenient for use;

[0031] Furthermore, when installing the connecting pipe, the connecting pipe will push the force plate, and the connecting spring will be squeezed at this time. When the connecting pipe needs to be removed, the long pin is directly pulled. When the end of the long pin moves out of the card slot, the connecting pipe and the lower connecting pipe are not in a card-engaged state. At this time, the connecting spring and the force plate will push the connecting pipe, making it easy to remove the connecting pipe, thereby improving work efficiency.

[0032] Furthermore, after the connecting pipe is removed, the filter screen can be removed, and the positioning block on the surface of the filter screen can be moved out of the positioning groove. After cleaning each component, the positioning block can be inserted into the positioning groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the connection structure between the front mainboard and the rear mainboard of the present invention;

[0034] Figure 2 This is a schematic diagram of the connection structure between the front mainboard and the protection frame of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the positioning groove distribution state of the present invention;

[0036] Figure 4 This is a schematic diagram of the connection structure between the induction expansion member and the limit plate of the present invention;

[0037] Figure 5 This is a schematic diagram of the connection structure between the protection frame and the switch of the present invention;

[0038] Figure 6 This is a schematic diagram of the connection structure of the lower connecting pipe and the overlapping block of the present invention;

[0039] Figure 7 This is a schematic diagram of the connection structure of the lower connecting pipe and the connecting pipe of the present invention;

[0040] Figure 8 It is a schematic diagram of the cross-sectional structure of the overlap block of the present invention;

[0041] Fig. 9 For the present invention Figure 8 Enlarged structural diagram at A in the middle.

[0042] In the figure: 1. front main board; 2. rear main board; 3. fin; 4. connecting rod; 5. nut; 6. gasket; 7. water pipe; 8. lower connecting pipe; 9. filter screen; 10. positioning block; 11. positioning groove; 12. protection frame; 13. support rod; 14. induction expansion member; 15. limit plate; 16. limit column; 17. movable plate; 18. touch rod; 19. switch; 20. overlap block; 21. long pin; 22. force plate; 23. connecting spring; 24. connecting pipe; 25. external block; 26. column; 27. slot; 28. slider; 29. ​​reset spring; 30. slide groove. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] See also Figure 1-Figure 9 The present invention provides the following technical solution: a wastewater heat recovery heat exchange device:

[0045] Embodiment 1: The most basic heat recovery is completed by setting the front main board 1, the rear main board 2, the fins 3, the connecting rod 4 and the nut 5, the gasket 6 and the water pipe 7, and the impurities are isolated by the filter 9. Figure 1 and Figure 2 as well as Figure 3 As shown:

[0046] It includes a front main board 1 and a gasket 6, wherein the front main board 1 is internally threadedly connected with a connecting rod 4, and the right surface of the connecting rod 4 is threadedly connected with a rear main board 2, and a fin 3 is arranged between the front main board 1 and the rear main board 2, and a nut 5 is threadedly connected at the end position of the connecting rod 4, the surface of the gasket 6 is in contact with the surface of the rear main board 2, and a support rod 13 is slidably arranged inside the rear main board 2, and the end of the left side of the support rod 13 is fixedly connected with the right surface of the front main board 1;

[0047] A wastewater heat recovery heat exchange device, further comprising:

[0048] Water pipe 7: The water pipe 7 is bolted to the surface of the front main board 1, and four water pipes 7 are arranged on the surface of the front main board 1. The water pipe 7 at the lower right side enters hot water, the water pipe 7 at the upper right side discharges hot water, the water pipe 7 at the upper left side enters cold water, and the water pipe 7 at the lower left side discharges cold water;

[0049] Lower pipe 8: The lower pipe 8 is fixedly connected to the surface of the lower water pipe 7 on the right side, and the lower pipe 8 opens downward. A lap block 20 is fixedly connected to the surface of the lower pipe 8, and a filter screen 9 is provided inside the lower pipe 8;

[0050] The protection frame 12 is fixedly connected to the right side surface of the front main board 1, and the right side surface of the front main board 1 is fixedly connected to a limit plate 15, and the surface of the limit plate 15 is bonded and connected to an induction expansion member 14;

[0051] Switch 19: The switch 19 is fixedly connected to the inner wall of the protection frame 12, and the switch 19 is connected to the external controller by network signals. The connecting tube 24 is snap-fitted to the lower connecting tube 8, and the surface of the connecting tube 24 is fixedly connected with an external connection block 25. The surface of the filter screen 9 is fixedly connected with a positioning block 10. The inner wall of the lower connecting tube 8 is concave, and the surface of the lower connecting tube 8 is provided with a positioning groove 11 corresponding to the positioning block 10.

[0052] During operation, hot water enters the device through the water pipe 7 at the lower right side and is discharged from the device through the water pipe 7 at the upper right side. At the same time, cold water enters the water pipe 7 at the upper left side and cold water exits the water pipe 7 at the lower left side, thus completing normal wastewater heat recovery work. During operation, the filter screen 9 inside the lower connecting pipe 8 plays a role in isolating impurities and preventing them from entering the device.

[0053] Embodiment 2: Different from Embodiment 1, the touch rod 18 is provided to stop the device from working when it is overheated. Figure 4 and Figure 5 As shown:

[0054] The limit plate 15 is symmetrically distributed about the center of the inductive expansion member 14, and the lower surface of the inductive expansion member 14 is in contact with the upper surface of the fin 3, and the surface of the limit plate 15 is fixedly connected to the limit column 16, the surface of the limit column 16 is sleeved with a movable plate 17, and the upper surface of the movable plate 17 is fixedly connected to a touch rod 18 corresponding to the switch 19.

[0055] During operation, the temperature of the fin 3 will rise. When the temperature of the fin 3 rises, the inductive expansion member 14 will expand due to the heat. At this time, the inductive expansion member 14 will expand in the vertical direction under the limiting action of the limiting plate 15, and then the inductive expansion member 14 will push the movable plate 17 and the touch rod 18 to rise. When the temperature exceeds the normal value, the inductive expansion member 14 expands greatly. At this time, the touch rod 18 will contact the switch 19, so that the external controller works, and then the entire device stops working, so that the overall temperature of the device does not continue to rise, thereby ensuring the overall safety of the device. When the movable plate 17 rises, the movable plate 17 will only move in the vertical direction under the action of the limiting column 16. When the device is not working, the temperature of the fin 3 drops. At this time, the inductive expansion member 14 dissipates heat and retracts, and then the movable plate 17 and the touch rod 18 drop under the action of their own gravity, which is convenient for the next use.

[0056] Embodiment 3: Different from Embodiment 2, the connecting pipe 24 and the lower connecting pipe 8 can be quickly engaged by means of the provided slot 27 and the long pin 21. Figure 6-Figure 9 As shown:

[0057] The external blocks 25 are symmetrically distributed about the center of the connecting tube 24, and the external blocks 25 correspond one-to-one to the overlapping blocks 20, and the upper surface of the external blocks 25 is fixedly connected with a column 26, the column 26 passes through the interior of the overlapping block 20, and a slot 27 is opened on the surface of the column 26, and a long pin 21 corresponding to the slot 27 is slidably arranged inside the overlapping block 20.

[0058] The lower surface of the long pin 21 is inclined, and the upper surface of the long pin 21 is fixedly connected to a slider 28, and the long pin 21 passes through the interior of the overlapping block 20. The surface of the slider 28 is fixedly connected to a reset spring 29 that plays an elastic reset role, and the other side of the reset spring 29 is fixedly connected to the inner wall of the overlapping block 20.

[0059] When docking the connecting tube 24, the column 26 on the surface of the external block 25 is inserted into the inside of the overlapping block 20 on the surface of the lower connecting tube 8. During this process, the column 26 will push the long pin 21 through the inclined surface of the long pin 21, and then the long pin 21 moves to the outside of the overlapping block 20. At this time, the long pin 21 drives the slider 28 to squeeze the reset spring 29. After the upper surface of the connecting tube 24 contacts the lower surface of the lower connecting tube 8, the slot 27 and the long pin 21 are in the same horizontal direction. At this time, the long pin 21 returns to its original position under the action of the slider 28 and the reset spring 29, and then the connecting tube 24 and the lower connecting tube 8 are docked, which is convenient for use.

[0060] Embodiment 4: Different from Embodiment 3, the connection spring 23 and the force plate 22 are provided, so that the connection pipe 24 can be quickly disassembled, thereby improving the working efficiency. Figure 7 As shown:

[0061] The end of the long pin 21 is convex downward, and a slide groove 30 corresponding to the slider 28 is opened inside the overlap block 20. A connecting spring 23 that plays an elastic reset role is fixedly connected to the lower surface of the overlap block 20, and a force-bearing plate 22 is fixedly connected to the other side of the connecting spring 23, and the force-bearing plate 22 is symmetrically distributed about the center of the overlap block 20.

[0062] When installing the connecting tube 24, the connecting tube 24 will push the force plate 22. At this time, the connecting spring 23 will be squeezed by the force plate 22. When the connecting tube 24 needs to be removed, the long pin 21 is directly pulled. After the end of the long pin 21 moves out of the card slot 27, the connecting tube 24 and the lower connecting tube 8 are not in a locked state. At this time, the connecting spring 23 and the force plate 22 will push the connecting tube 24, so that the connecting tube 24 is easy to be disassembled, thereby improving work efficiency. After the connecting tube 24 is removed, the filter screen 9 inside the lower connecting tube 8 can be taken out, and the positioning block 10 on the surface of the filter screen 9 can be moved out of the positioning slot 11. After cleaning all the components, the positioning block 10 can be inserted into the positioning slot 11. At this time, the filter screen 9 is reinstalled inside the lower connecting tube 8.

[0063] The above is the working process of the entire device, and the contents not described in detail in this specification belong to the existing technology known to professional and technical personnel in this field.

Claims

1. A wastewater heat recovery type heat exchange device, comprising a front main board (1) and a gasket (6), wherein the front main board (1) is internally threadedly connected to a connecting rod (4), and the right side surface of the connecting rod (4) is threadedly connected to a rear main board (2), and a fin (3) is arranged between the front main board (1) and the rear main board (2), and a nut (5) is threadedly connected to the end position of the connecting rod (4); The surface of the gasket (6) is in contact with the surface of the rear main board (2), and a support rod (13) is slidably provided inside the rear main board (2), and the left end of the support rod (13) is fixedly connected to the right surface of the front main board (1); It is characterized in that Also includes: A water pipe (7), the water pipe (7) being bolted to the surface of the front main board (1), and four water pipes (7) are arranged on the surface of the front main board (1), the water pipe (7) at the lower right side being for hot water inlet, the water pipe (7) at the upper right side being for hot water outlet, the water pipe (7) at the upper left side being for cold water inlet, and the water pipe (7) at the lower left side being for cold water outlet; A lower connecting pipe (8), the lower connecting pipe (8) being fixedly connected to the surface of the lower right water pipe (7), the lower connecting pipe (8) opening being downward, a lap block (20) being fixedly connected to the surface of the lower connecting pipe (8), and a filter screen (9) being provided in a snap-fitting manner inside the lower connecting pipe (8); A protection frame (12), the protection frame (12) being fixedly connected to the right side surface of the front main board (1), and the right side surface of the front main board (1) being fixedly connected to a limit plate (15), and the surface of the limit plate (15) being bonded and connected to an induction expansion member (14); A switch (19), wherein the switch (19) is fixedly connected to the inner wall of the protection frame (12), and the switch (19) is connected to an external controller via a network signal; A connecting pipe (24), the connecting pipe (24) and the lower connecting pipe (8) are connected by snap-fitting, and an external connection block (25) is fixedly connected to the surface of the connecting pipe (24).

2. A wastewater heat recovery heat exchange device according to claim 1, characterized in that: A positioning block (10) is fixedly connected to the surface of the filter screen (9), the inner wall of the lower connecting pipe (8) is concave, and a positioning groove (11) corresponding to the positioning block (10) is formed on the surface of the lower connecting pipe (8).

3. The wastewater heat recovery heat exchange device according to claim 1, characterized in that: The limiting plates (15) are symmetrically distributed about the center of the inductive expansion member (14), the lower surface of the inductive expansion member (14) is in contact with the upper surface of the fin (3), and the surface of the limiting plates (15) is fixedly connected to the limiting columns (16).

4. A wastewater heat recovery heat exchange device according to claim 3, characterized in that: A movable plate (17) is sleeved and connected to the surface of the limit column (16), and a touch rod (18) corresponding to the switch (19) is fixedly connected to the upper surface of the movable plate (17).

5. The wastewater heat recovery heat exchange device according to claim 1, characterized in that: The external connection blocks (25) are symmetrically distributed about the center of the connecting pipe (24), and the external connection blocks (25) correspond one to one to the overlapping blocks (20), and a column (26) is fixedly connected to the upper surface of the external connection block (25).

6. A wastewater heat recovery heat exchange device according to claim 5, characterized in that: The upright column (26) passes through the interior of the lap block (20), and a slot (27) is provided on the surface of the upright column (26), and a long pin (21) corresponding to the slot (27) is slidably provided inside the lap block (20).

7. A wastewater heat recovery heat exchange device according to claim 6, characterized in that: The lower surface of the long pin (21) is inclined, and the upper surface of the long pin (21) is fixedly connected to a slider (28), and the long pin (21) passes through the interior of the bridging block (20).

8. The wastewater heat recovery heat exchange device according to claim 7, characterized in that: A return spring (29) having an elastic return function is fixedly connected to the surface of the sliding block (28), and the other side of the return spring (29) is fixedly connected to the inner wall of the connecting block (20).

9. The wastewater heat recovery heat exchange device according to claim 7, characterized in that: The end of the long pin (21) is convex downwardly, and a sliding groove (30) corresponding to the sliding block (28) is provided inside the connecting block (20).

10. The wastewater heat recovery heat exchange device according to claim 1, characterized in that: A connection spring (23) having an elastic reset function is fixedly connected to the lower surface of the connecting block (20), and a force-bearing plate (22) is fixedly connected to the other side of the connecting spring (23), and the force-bearing plate (22) is symmetrically distributed about the center of the connecting block (20).

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