A leak-proof pneumatic diaphragm pump

Abstract

The present invention is applicable to the technical field of diaphragm pumps, and provides an air-leakage-proof pneumatic diaphragm pump, comprising a pump body, a diaphragm assembly, a driving assembly, an air intake assembly and a shock-absorbing assembly. Two air chambers are arranged inside the pump body, and the diaphragm assembly comprises two first diaphragms and two second diaphragms, the first diaphragms are fixedly connected to the second diaphragms, wherein the first diaphragms are fixed in the card slots of the air chambers by bolts, and the second diaphragms are filled in the sealing grooves, thereby improving the sealing between the diaphragms and the air chambers, and preventing air leakage during operation, which affects the working efficiency of the diaphragm pump; meanwhile, the air intake assembly is installed in the air intake chamber, and the air intake assembly comprises an air intake pipe, wherein a sliding block is slidably installed on the air intake pipe, and when the sliding block is pressed down by the gas transmission pipeline, the sliding block drives two clamping plates to clamp the pipeline through a transmission connecting rod, and the pipeline is clamped and fixed by the two clamping plates, and sealing pads are arranged on the clamping plates, thereby improving the sealing of the pipeline and achieving higher air intake efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of diaphragm pumps, and in particular relates to an air-leakage-proof pneumatic diaphragm pump. Background Art

[0002] In the current diaphragm pump technology, the diaphragm pump uses a thin film to separate the pumped liquid from the piston and the pump cylinder, thereby protecting the piston and the pump cylinder. The left side of the diaphragm that contacts the liquid is made of corrosion-resistant materials or coated with a layer of corrosion-resistant material; the right side of the diaphragm is filled with water or oil.

[0003] The utility model patent with publication number CN216198904U discloses a leak-proof diaphragm pump with a shock-absorbing mechanism, which includes a feed pipe and a discharge pipe, a left pump body assembly connected between the left ends of the feed pipe and the discharge pipe, a right pump body assembly installed between the right ends of the feed pipe and the discharge pipe, and a power assembly fixed between the left pump body assembly and the right pump body assembly; wherein, the lower end of the discharge pipe is fixedly connected with a left-right symmetrical fixed foot, the lower end of the fixed foot is fixedly connected with a connecting plate, the lower end of the connecting plate is fixedly connected with a shock-absorbing mechanism with a shock-absorbing effect, the lower end of the shock-absorbing mechanism is fixedly connected with a bottom plate and an anti-slip pad in sequence, and a first elastic element that can be elastically deformed is installed between the connecting plate and the bottom plate. The shock absorbing mechanism is used to buffer the force generated when the diaphragm pump is subjected to external force or vibration is generated during operation, thereby ensuring the stability of the diaphragm pump and avoiding the shaking of the diaphragm pump that affects the working accuracy of the diaphragm pump. At the same time, the first elastic element is used to perform secondary buffering between the connecting plate and the bottom plate to further improve the shock absorbing effect. The sealing ball in the left pump body assembly and the right pump body assembly ensures the sealing and effectively prevents the leakage of liquid in the diaphragm pump.

[0004] However, the above patent has the following shortcomings:

[0005] 1. The sealing balls in the left pump body assembly and the right pump body assembly of the above patent improve the sealing performance of the diaphragm pump. However, when the diaphragm pump is in use, since the chamber where the diaphragm is located needs to be frequently inspected and maintained, after long-term use, a gap is easily generated between the diaphragm and the inside of the chamber, resulting in air leakage, liquid leakage, etc.

[0006] 2. When the above patent and the commonly used diaphragm pump are connected to the air intake pipe, a gap is easily generated between the air intake pipe and the diaphragm pump, resulting in air leakage, etc., causing the diaphragm pump to be underpowered. Summary of the invention

[0007] The present invention provides an air-leakage-proof pneumatic diaphragm pump, aiming to solve the problem mentioned in the above background that after long-term use, a gap is easily generated between the diaphragm and the inside of the chamber, resulting in air and liquid leakage, and the diaphragm pump is prone to gaps when connected to an air intake pipe.

[0008] The present invention is implemented as follows: an air-leakage-proof pneumatic diaphragm pump comprises a pump body, a diaphragm assembly, a drive assembly, an air intake assembly and a shock-absorbing assembly, wherein the diaphragm assembly, the drive assembly and the shock-absorbing assembly are all mounted on the pump body, and the air intake assembly is mounted on the drive assembly;

[0009] The pump body comprises a feed pipe, and the feed pipe is provided with a discharge pipe via two guide pipes;

[0010] The two guide tubes are both detachably mounted with air chambers, and the inner walls of the air chambers are provided with sealing grooves and clamping grooves;

[0011] The diaphragm assembly comprises two first diaphragms, the side walls of the two first diaphragms are fixedly connected to the second diaphragms, and a plastic reinforcing rib is arranged between the first diaphragms and the second diaphragms;

[0012] The two first diaphragms are fixed in the card slot by fixing screws, and the second diaphragm is filled in the sealing groove; in this scheme, the second diaphragm is filled in the sealing groove to improve the sealing between the first diaphragm and the air chamber, and at the same time, the reinforcing ribs between the first diaphragm and the second diaphragm improve the structural strength of the diaphragm.

[0013] Preferably, the feed pipe is provided with a feed inlet, and the discharge pipe is provided with a discharge outlet;

[0014] Two one-way ball valves 1 are installed on the feed pipe, and two one-way ball valves 2 are installed on the discharge pipe. In this scheme, the material is fed through the feed port, transported by the guide pipe, and discharged from the discharge port. At the same time, the one-way ball valve 1 and the one-way ball valve 2 facilitate the one-way passage of the transported material.

[0015] Preferably, the driving assembly comprises a driving chamber, the driving chamber is connected to the two air chambers, and a piston chamber is installed on the driving chamber;

[0016] The interior of the driving chamber is provided with air channel 1 and air channel 2 connected to the piston chamber, and the air channel 1 and air channel 2 are respectively connected to the corresponding air chambers; in this scheme, the air pump pushes air into the piston chamber, and sends compressed gas into the corresponding air chambers through air channel 1 and air channel 2 respectively, and at the same time, air channel 1 and air channel 2 are arranged longitudinally, thereby pushing the corresponding first diaphragm and second diaphragm, and then transporting the material.

[0017] Preferably, a piston rod is slidably connected in the piston chamber, and piston block 1 and piston block 2 are installed on the piston rod; in this scheme, the driving gas pushes the piston rod, and the piston rod slides longitudinally in the piston chamber, and piston block 1 and piston block 2 are used to block and release airway 1 and airway 2 respectively, thereby opening and closing airway 1 and airway 2.

[0018] Preferably, a fixing sleeve is installed in the driving chamber, sealing rings are installed at both ends of the fixing sleeve, and the fixing sleeve is sealed and connected to the driving chamber through the sealing rings;

[0019] An intermediate shaft is slidably connected inside the fixed sleeve, and both ends of the intermediate shaft penetrate the corresponding first and second diaphragms, and the first and second diaphragms are clamped by pressure plates at both ends of the intermediate shaft. In this scheme, the sealing performance of the fixed sleeve is improved by a sealing ring, and a gas flow channel is provided on the outer wall of the fixed sleeve to facilitate the discharge of compressed gas. The intermediate shaft is slidably connected to the fixed sleeve, and the intermediate shaft is used to reciprocate inside the fixed sleeve to push the first and second diaphragms, control the internal pressure of the air chamber, and then transport materials.

[0020] Preferably, an air intake chamber is installed on the driving chamber;

[0021] The air intake assembly comprises an air intake pipe, which is installed in the air intake chamber and communicates with the piston chamber;

[0022] A sliding block is slidably mounted on the outer wall of the intake pipe, and a compression spring is sleeved on the outer wall of the intake pipe, and the compression spring abuts against the bottom wall of the sliding block; in this solution, the sliding block and the inner wall of the intake chamber are respectively raised by the upper and lower ends of the compression spring.

[0023] Preferably, the sliding block is connected to two "C"-shaped clamping plates through two transmission connecting rods, and the two clamping plates are elastically connected to the inner wall of the air inlet chamber through a connecting spring;

[0024] Sealing pads are provided on the inner walls of the two clamps. In this scheme, when the sliding block is subjected to force and descends, the two clamps are pulled away from each other by the transmission connecting rod, thereby facilitating the connection of the air intake pipe to the air intake pipe. At the same time, the compression spring automatically returns to its original position elastically, driving the sliding block to return to its original position, wherein the connecting spring drives the two clamps to return to their original position, thereby clamping the air intake pipe to prevent air leakage in the air intake pipe.

[0025] Preferably, the shock absorbing assembly comprises a base, and two of the bases are fixedly mounted on the lower surface of the feed pipe;

[0026] The base is provided with a mounting groove inside, a lower shock absorbing seat is installed on the bottom wall of the mounting groove, and a shock absorbing spring is installed in the lower shock absorbing seat;

[0027] An upper shock-absorbing seat is installed on the top wall of the installation groove, and a fixing rod is installed on the inner wall of the upper shock-absorbing seat, and the fixing rod contacts the shock-absorbing spring; in this scheme, the shock-absorbing spring is compressed by the fixing rod, and when it is vibrated, the shock-absorbing spring absorbs part of the vibration force by its elasticity.

[0028] Compared with the prior art, the beneficial effects of the present invention are: the air leakage-proof pneumatic diaphragm pump of the present invention,

[0029] 1. Two air chambers are arranged inside the pump body, and the diaphragm assembly includes two first diaphragms and two second diaphragms. The first diaphragm is fixedly connected to the second diaphragm, wherein the first diaphragm is fixed in the card slot of the air chamber by bolts, and the second diaphragm is filled in the sealing groove, which improves the sealing between the diaphragm and the air chamber, prevents air leakage during operation, and affects the working efficiency of the diaphragm pump;

[0030] 2. At the same time, the air intake assembly is installed in the air intake chamber. The air intake assembly includes an air intake pipe, wherein a sliding block is slidably installed on the air intake pipe. When the sliding block is pressed down by the air transmission pipeline, the sliding block drives two clamping plates to clamp the pipeline through the transmission connecting rod. The pipeline is clamped and fixed by the two clamping plates. At the same time, a sealing gasket is arranged on the clamping plate to improve the sealing of the pipeline and improve the air intake efficiency;

[0031] 3. Two shock-absorbing components are arranged at the lower end of the pump body. The shock-absorbing components squeeze the shock-absorbing spring through the fixed rod inside the base to reduce the vibration of the diaphragm pump during operation, thereby reducing the vibration of the internal seal of the diaphragm pump, extending the service life of the seal, and preventing the diaphragm pump from leaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The main view of the present invention as a whole

[0033] Figure 2 A schematic diagram of the overall structure of the present invention

[0034] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle

[0035] Figure 4 For the present invention Figure 2 Enlarged view of point B

[0036] Figure 5 For the present invention Figure 2 Enlarged view of point C in the middle

[0037] Figure 6 The schematic diagram of the structure of the diaphragm assembly of the present invention is

[0038] Figure 7 The schematic diagram of the structure of the air intake seat of the present invention is

[0039] Figure 8 The structural schematic diagram of the splint of the present invention is

[0040] In the figure:

[0041] 1. Pump body; 11. Feed pipe; 111. One-way ball valve 1; 12. Discharge pipe; 121. One-way ball valve 2; 13. Guide pipe; 14. Feed port; 15. Discharge port; 16. Air chamber; 17. Sealing groove; 18. Card slot;

[0042] 2. Diaphragm assembly; 21. First diaphragm; 22. Second diaphragm; 23. Fixing screw;

[0043] 3. Driving assembly; 31. Driving chamber; 311. Airway 1; 312. Airway 2; 32. Piston chamber; 33. Piston rod; 331. Piston block 1; 332. Piston block 2; 34. Fixed sleeve; 341. Sealing ring; 35. Intermediate shaft; 351. Press plate; 36. Intake chamber;

[0044] 4. Intake assembly; 41. Intake pipe; 411. Sliding block; 412. Compression spring; 42. Clamp; 421. Transmission connecting rod; 422. Connecting spring; 423. Sealing pad;

[0045] 5. shock absorbing assembly; 51. base; 511. mounting groove; 52. upper shock absorbing seat; 521. fixing rod; 522. shock absorbing spring; 53. lower shock absorbing seat. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0047] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0048] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] See also Figure 1-8 The present invention provides a technical solution: an air leakage-proof pneumatic diaphragm pump, comprising a pump body 1, a diaphragm assembly 2, a drive assembly 3, an air intake assembly 4 and a shock absorbing assembly 5, wherein the diaphragm assembly 2, the drive assembly 3 and the shock absorbing assembly 5 are all mounted on the pump body 1, and the air intake assembly 4 is mounted on the drive assembly 3, the pump body 1 comprises a feed pipe 11, the feed pipe 11 is mounted with a discharge pipe 12 through two guide tubes 13, an air chamber 16 is detachably mounted on the two guide tubes 13, a sealing groove 17 and a card slot 18 are arranged on the inner wall of the air chamber 16, the diaphragm assembly 2 comprises two first diaphragms 21, a second diaphragm 22 is fixedly connected to the side walls of the two first diaphragms 21, a plastic reinforcing rib is arranged between the first diaphragm 21 and the second diaphragm 22, the two first diaphragms 21 are fixed in the card slot 18 by fixing screws 23, and the second diaphragm 22 is filled in the sealing groove 17.

[0052] Among them, the air chamber 16 is detachably installed to facilitate opening the air chamber 16 for cleaning, the first diaphragm 21 is fixed in the card slot 18 by the fixing screws 23, and the second diaphragm 22 is filled in the sealing groove 17 for higher internal sealing. By agitating the first diaphragm 21 and the second diaphragm 22, the internal pressure of the guide tube 13 is controlled, and then the external air pressure is used to push and transport the material.

[0053] The feed pipe 11 is provided with a feed port 14 , the discharge pipe 12 is provided with a discharge port 15 , the feed pipe 11 is provided with two one-way ball valves 111 , and the discharge pipe 12 is provided with two one-way ball valves 2 121 .

[0054] Among them, the feed port 14 is convenient for raw materials to enter, and the raw materials are discharged through the discharge port 15. By adjusting the internal pressure, the corresponding one-way ball valve 111 and one-way ball valve 2 121 are opened to facilitate the extraction of materials.

[0055] The driving assembly 3 includes a driving chamber 31, which is connected to the two air chambers 16. A piston chamber 32 is installed on the driving chamber 31, and an air channel 1 311 and an air channel 2 312 connected to the piston chamber 32 are arranged inside the driving chamber 31. The air channel 1 311 and the air channel 2 312 are respectively connected to the corresponding air chambers 16. A piston rod 33 is slidably connected in the piston chamber 32, and a piston block 1 331 and a piston block 2 332 are installed on the piston rod 33. A fixed sleeve 34 is installed in the driving chamber 31, and sealing rings 341 are installed at both ends of the fixed sleeve 34, and the fixed sleeve 34 is sealed and connected to the driving chamber 31 through the sealing ring 341. An intermediate shaft 35 is slidably connected in the fixed sleeve 34, and both ends of the intermediate shaft 35 pass through the corresponding first diaphragm 21 and the second diaphragm 22, and the two ends of the intermediate shaft 35 clamp the first diaphragm 21 and the second diaphragm 22 through a pressure plate 351.

[0056] It should be noted that the compressed gas enters the piston chamber 32, pushing the piston rod 33 to move, and the piston rod 33 drives the piston block 1 331 and the piston block 2 332 to move longitudinally, thereby controlling the connection between the air channel 1 311 and the air channel 2 312, allowing the gas to enter the inner wall of the corresponding air chamber 16, pushing the corresponding first diaphragm 21 and the second diaphragm 22, controlling the pressure inside the guide tube 13, and then transporting the material.

[0057] An air intake chamber 36 is installed on the driving chamber 31, and the air intake assembly 4 includes an air intake pipe 41, which is installed in the air intake chamber 36 and connected to the piston chamber 32. A sliding block 411 is slidably installed on the outer wall of the air intake pipe 41, and a compression spring 412 is mounted on the outer wall of the air intake pipe 41, and the compression spring 412 abuts against the bottom wall of the sliding block 411. The sliding block 411 is connected to two "C"-shaped clamps 42 through two transmission connecting rods 421. The two clamps 42 are elastically connected to the inner wall of the air intake chamber 36 through a connecting spring 422, and sealing gaskets 423 are provided on the inner walls of the two clamps 42.

[0058] Specifically, one end of the connecting spring 422 is fixedly connected to the outer wall of the connecting splint 42, and the other end is fixedly connected to the inner wall of the air intake chamber 36. A through hole is opened on the air intake chamber 36. When the sliding block 411 is compressed, the sliding block 411 descends, and the two splints 42 move away from each other. The connecting spring 422 is elongated. At the same time, after the sliding block 411 reduces the force, the connecting spring 422 pulls the two splints 42 through its own elasticity, and the air intake pipe is clamped by the two splints 42. The sealing gasket 423 improves the sealing of the air intake pipe, and the air tightness is higher.

[0059] The shock absorbing assembly 5 includes a base 51, and the two bases 51 are fixedly mounted on the lower surface of the feed pipe 11. A mounting groove 511 is arranged inside the base 51, a lower shock absorbing seat 53 is mounted on the bottom wall of the mounting groove 511, a shock absorbing spring 522 is mounted in the lower shock absorbing seat 53, an upper shock absorbing seat 52 is mounted on the top wall of the mounting groove 511, a fixing rod 521 is mounted on the inner wall of the upper shock absorbing seat 52, and the fixing rod 521 abuts against the shock absorbing spring 522.

[0060] Specifically, the diaphragm pump generates vibration force when working, and the fixed rod 521 resists the shock-absorbing spring 522. When the compressed shock-absorbing spring 522 is subjected to pressure, it uses its own spring to resist the vibration force. The upper shock-absorbing seat 52 and the lower shock-absorbing seat 53 limit the positions of the fixed rod 521 and the shock-absorbing spring 522, which has higher stability, reduces the vibration of the diaphragm pump when it is working, and prevents the seals inside the diaphragm pump from loosening due to long-term vibration.

[0061] Working principle and use process of the present invention: please refer to Figure 1-8 The air intake pipe is inserted into the through hole on the air intake chamber 36, and the air intake pipe is connected to the air intake pipe 41. When the sliding block 411 is compressed, the sliding block 411 descends, the two clamping plates 42 move away from each other, and the connecting spring 422 is stretched. At the same time, after the sliding block 411 reduces the force, the connecting spring 422 pulls the two clamping plates 42 through its own elasticity, and the air intake pipe is clamped by the two clamping plates 42, and the compressed gas enters the piston chamber 32, pushing the piston rod 33 to move, and the piston rod 33 drives the piston block 1 331 and the piston block 2 332 to move longitudinally, thereby controlling the connection between the air channel 1 311 and the air channel 2 312, so that the gas enters the corresponding air chamber 16, and the material enters from the feed port 14, pushing the corresponding first diaphragm 21 and the second diaphragm 22, controlling the pressure inside the guide tube 13, opening the corresponding one-way ball valve 1 111 and the one-way ball valve 2 121, and then conveying the material, so that the material is discharged from the discharge port 15.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A leak-proof pneumatic diaphragm pump, characterized in that: The pump comprises a pump body (1), a diaphragm assembly (2), a drive assembly (3), an air intake assembly (4) and a shock absorbing assembly (5), wherein the diaphragm assembly (2), the drive assembly (3) and the shock absorbing assembly (5) are all mounted on the pump body (1), and the air intake assembly (4) is mounted on the drive assembly (3); The pump body (1) comprises a feed pipe (11), and the feed pipe (11) is provided with a discharge pipe (12) via two guide pipes (13); An air chamber (16) is detachably mounted on each of the two guide tubes (13), and a sealing groove (17) and a clamping groove (18) are provided on the inner wall of the air chamber (16); The diaphragm assembly (2) comprises two first diaphragms (21), the side walls of the two first diaphragms (21) being fixedly connected to a second diaphragm (22), and a plastic reinforcing rib is provided between the first diaphragm (21) and the second diaphragm (22); The two first diaphragms (21) are fixed in the clamping groove (18) by means of fixing screws (23), and the second diaphragm (22) is filled in the interior of the sealing groove (17); The driving assembly (3) comprises a driving chamber (31), and an air intake chamber (36) is mounted on the driving chamber (31); The driving chamber (31) is in communication with the two air chambers (16), and a piston chamber (32) is installed on the driving chamber (31); The driving chamber (31) is provided with an air passage 1 (311) and an air passage 2 (312) communicating with the piston chamber (32), and the air passage 1 (311) and the air passage 2 (312) are respectively communicated with the corresponding air chamber (16); The air intake assembly (4) comprises an air intake pipe (41), the air intake pipe (41) is installed in the air intake chamber (36), and the air intake pipe (41) is connected to the piston chamber (32); A sliding block (411) is slidably mounted on the outer wall of the air intake pipe (41), and a compression spring (412) is sleeved on the outer wall of the air intake pipe (41), wherein the compression spring (412) abuts against the bottom wall of the sliding block (411); The sliding block (411) is transmission-connected to two "C"-shaped clamping plates (42) via two transmission connecting rods (421); the two clamping plates (42) are elastically connected to the inner wall of the air inlet chamber (36) via a connection spring (422); Sealing pads (423) are provided on the inner walls of the two clamping plates (42).

2. The air-leakage-proof pneumatic diaphragm pump according to claim 1, characterized in that: The feed pipe (11) is provided with a feed port (14), and the discharge pipe (12) is provided with a discharge port (15); The feed pipe (11) is provided with two one-way ball valves (111), and the discharge pipe (12) is provided with two one-way ball valves (121).

3. The air-leakage-proof pneumatic diaphragm pump according to claim 1, characterized in that: A piston rod (33) is slidably connected in the piston chamber (32), and a piston block 1 (331) and a piston block 2 (332) are mounted on the piston rod (33).

4. The air-leakage-proof pneumatic diaphragm pump according to claim 1, characterized in that: A fixing sleeve (34) is installed in the driving chamber (31), sealing rings (341) are installed at both ends of the fixing sleeve (34), and the fixing sleeve (34) is sealed and connected to the driving chamber (31) via the sealing rings (341); An intermediate shaft (35) is slidably connected inside the fixed sleeve (34), and both ends of the intermediate shaft (35) penetrate the corresponding first diaphragm (21) and second diaphragm (22), and the two ends of the intermediate shaft (35) clamp the first diaphragm (21) and the second diaphragm (22) through a pressing plate (351).

5. The air-leakage-proof pneumatic diaphragm pump according to claim 1, characterized in that: The shock absorbing assembly (5) comprises a base (51), and two bases (51) are fixedly mounted on the lower surface of the feeding pipe (11); The base (51) is provided with a mounting groove (511) inside, a lower shock absorbing seat (53) is mounted on the bottom wall of the mounting groove (511), and a shock absorbing spring (522) is mounted inside the lower shock absorbing seat (53); An upper shock absorbing seat (52) is installed on the top wall of the installation groove (511), and a fixing rod (521) is installed on the inner wall of the upper shock absorbing seat (52), wherein the fixing rod (521) abuts against the shock absorbing spring (522).

Images