A fire retardant coating spraying device for composite fire retardant expansion board

Abstract

The present application relates to the technical field of coating spraying, and specifically to a fire retardant coating spraying device for composite fire-retardant expansion board material. The present application provides a fire retardant coating spraying device for composite fire-retardant expansion board material, comprising: a pair of support frames, arranged on the frame, and the nozzle is located between the pair of support frames, and each support frame is provided with a blocking belt; a collecting bin, fixedly connected to the support frame and located below the blocking belt, and the collecting bin stores fire retardant coating; a rotating roller, rotatably arranged on the support frame, and a clamping assembly is arranged on the support frame, and the clamping assembly can make the rotating rollers on both sides cooperate to clamp the side wall of the board; a spraying mechanism, arranged in the collecting bin, and the spraying mechanism is used to spray the fire retardant coating in the collecting bin onto the rotating roller. The present application can reduce the spraying time and improve work efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of coating spraying, and in particular to a fire retardant coating spraying device for composite fire retardant expansion panels. Background Art

[0002] Composite fireproof expansion board is a fireproof material, usually composed of multiple materials, with fireproof, heat insulation, sound insulation and other functions. Composite fireproof expansion board is mainly used to block large through holes in walls or stairs, and can also be used as a fire barrier to protect cable trays, casings, ventilation ducts or important production equipment. In the production process, in order to improve the fire resistance and durability of composite fireproof expansion board, it is usually necessary to spray fireproof coating on the surface of the board.

[0003] Referring to the Chinese patent with the authorization announcement number CN116651657B and the subject name being a plate spraying device, a driving motor is arranged on the frame, the output shaft of the driving motor is coaxially connected with a rotating shaft, a screw is fixedly sleeved on the rotating shaft, a clamp is provided on the threaded sleeve of the screw, a connecting plate is fixed on the top of the clamp, a push rod acting on the plate is fixed on the top of the connecting plate, when the plate needs to be sprayed, the driving shaft of the driving motor rotates to drive the rotating shaft and the screw to rotate, when the screw rotates, it can drive the clamp and the push rod on its top to move, the push rod can drive the plate to move, a nozzle is arranged above the frame, the nozzle can spray paint to spray the plate.

[0004] With regard to the above-mentioned related technologies, during the use of the composite fire-retardant expansion board, the side wall of the board is located outside, so it is necessary to spray fire-retardant coating on the side wall of the board. When spraying the composite fire-retardant expansion board, the coating sprayed from the nozzle is easy to splash out of the board surface and cause waste. Moreover, since the composite fire-retardant expansion board is relatively thick, it is usually necessary to spray fire-retardant coating on the upper and lower surfaces of the board and then spray fire-retardant material on the side wall of the board separately. The spraying time is long and the work efficiency is low. Summary of the invention

[0005] In order to reduce the spraying time and improve work efficiency, the present application provides a fire retardant coating spraying device for a composite fire retardant expansion plate.

[0006] The present application provides a fire retardant coating spraying device for a composite fire retardant expansion plate adopts the following technical scheme: a fire retardant coating spraying device for a composite fire retardant expansion plate, comprising a frame, on which a conveying roller for conveying the plate is rotatably arranged, a nozzle is arranged above the frame, and also comprises: a pair of support frames, which are arranged on the frame, and the nozzle is located between the pair of support frames, each of the support frames is provided with a blocking belt, a collecting bin is fixedly connected to the support frame, and the collecting bin is located below the blocking belt, and the collecting bin stores fire retardant coating; a rotating roller, which is rotatably arranged on the support frame, and a clamping assembly is arranged on the support frame, and the clamping assembly can make the rotating rollers on both sides cooperate to press the side wall of the plate, and a spraying mechanism is arranged in the collecting bin, and the spraying mechanism is used to spray the fire retardant coating in the collecting bin onto the rotating roller.

[0007] By adopting the above technical scheme, when the nozzle sprays the fire-retardant coating on the plate, the blocking belt can block the fire-retardant coating that exceeds the range of the plate, and the fire-retardant coating that falls on the blocking belt can slide along the blocking belt and fall into the collecting bin, and the spraying mechanism can spray the fire-retardant coating in the collecting bin onto the rotating roller. At the same time, the plate conveying can drive the rotating roller to rotate, and the rotation of the rotating roller can apply the fire-retardant coating on the side wall of the plate.

[0008] On the one hand, the present application can prevent the fire-retardant coating from falling onto the frame and can also collect and recycle the fire-retardant coating, thereby reducing the risk of the fire-retardant coating falling onto the conveying roller and contaminating the plate, reducing the waste of fire-retardant coating and reducing costs. On the other hand, the present application can simultaneously spray the fire-retardant coating on the upper surface of the plate and apply the fire-retardant coating to the side wall of the plate, thereby reducing working time and improving spraying efficiency. Moreover, the method of applying the fire-retardant coating by squeezing the rotating roller can improve the smoothness of the application of the fire-retardant coating to the side wall of the plate.

[0009] Optionally, the barrier strip is arranged obliquely on a side close to the plate.

[0010] By setting the blocking belt in an inclined manner, on the one hand, the coverage area can be increased, making it easier for the paint to fall on the blocking belt; on the other hand, the flow of the paint falling on the blocking belt can be guided, making it easier for the paint to fall into the collection bin.

[0011] Optionally, a plurality of conveying rollers are rotatably arranged on the support frame, and a blocking belt is sleeved on the conveying rollers. A transmission mechanism is arranged on the support frame, and the transmission mechanism can drive the conveying rollers to rotate.

[0012] By adopting the above technical scheme, the transmission mechanism can drive the conveying roller to rotate, and the rotation of the conveying roller can enable the barrier belt to be transported. The transmission of the barrier belt can increase the speed at which the fire retardant coating falls into the collection trough, reduce the risk of the fire retardant coating drying on the barrier belt, and improve the collection efficiency and effect of the fire retardant coating.

[0013] Optionally, a scraper is provided above the collecting bin, and the scraper can abut against the blocking belt.

[0014] By setting the scraper, the fire retardant coating that has fallen on the barrier strip and has not fallen off can be scraped off, reducing the risk of the fire retardant coating drying up as the barrier strip moves and improving the collection effect of the fire retardant coating.

[0015] Optionally, the transmission mechanism includes: a worm gear, vertically arranged on the support frame, a first driving wheel fixedly sleeved on the rotating roller, a first driven wheel fixedly sleeved on the worm gear, and a first belt jointly sleeved on the first driving wheel and the first driven wheel; a turbine, fixedly sleeved on one end of one of the conveying rollers, and the turbine can cooperate with the worm gear.

[0016] By adopting the above technical solution, when the rotating roller rotates, the rotating roller drives the first driving wheel, the first driven wheel and the worm to rotate and drive the first belt to transmit, the rotation of the worm drives the turbine to rotate, the rotation of the turbine drives a conveying roller to rotate, the rotation of one conveying roller drives other conveying rollers to rotate and drive the barrier belt to transmit, the transmission mechanism has a simple structure, and the entire process does not require manual operation.

[0017] Optionally, a rotating rod is rotatably provided at the bottom of the collecting bin, the rotating rod extends deep into the collecting bin, a second driving wheel is fixedly sleeved on the rotating roller, a second driven wheel is fixedly sleeved on the rotating rod, and a second belt is jointly sleeved on the second driving wheel and the second driven wheel.

[0018] By adopting the above technical solution, when the rotating roller rotates, the rotation of the rotating roller drives the second driving wheel and the second driven wheel to rotate, and the rotation of the second driven wheel drives the rotating rod to rotate. The rotation of the rotating rod can stir the fire retardant coating in the collection bin, thereby reducing the risk of fire retardant coating deposition.

[0019] Optionally, the spraying mechanism includes a connecting pipe arranged opposite to the rotating roller, and the end of the connecting pipe away from the rotating roller extends into the collecting bin, a first one-way valve is installed at the end of the connecting pipe close to the rotating roller, a second one-way valve is installed below the connecting pipe, a piston is slidably arranged in the connecting pipe, the end of the piston away from the rotating roller is hinged with a connecting rod, a connecting ring is fixedly connected to the connecting rod, an end of the rotating rod located in the collecting bin is fixedly connected to an eccentric rod, and the connecting ring is rotatably sleeved on the eccentric rod.

[0020] By adopting the above technical solution, when the rotating rod rotates, the rotating rod drives the eccentric rod to rotate, and the rotation of the eccentric rod can drive the piston to move back and forth along the connecting pipe. The fire retardant coating in the collecting bin can enter the connecting pipe through the second one-way valve and be sprayed out from the first one-way valve. The sprayed fire retardant coating falls on the rotating roller. The spraying mechanism has a compact structure and the entire process does not require an additional power source, which is conducive to energy saving.

[0021] Optionally, the clamping assembly includes a fixed cylinder fixedly connected to the frame, a sliding rod fixedly connected to the support frame, the sliding rod passing through the fixed cylinder, a thread is provided on the side of the sliding rod away from the support frame, a locking nut is threadedly connected to the side of the sliding rod away from the support frame, a compression spring is arranged between the frame and the support frame, and the compression spring is sleeved on the sliding rod.

[0022] By adopting the above technical solution, the setting of the sliding rod and the fixed cylinder can not only support the support frame but also guide the movement of the support frame; the setting of the compression springs on both sides can, on the one hand, adjust the position of the plate entering between the two support frames to make it in the middle position, and can guide the transportation of the plate, reducing the risk of the plate being offset, and on the other hand, can make the plate between the rotating rollers be pressed, so that the plate can drive the rotating rollers to rotate during the transmission process.

[0023] In summary, the present application includes at least one of the following beneficial effects:

[0024] 1. On the one hand, the present application can prevent the fire-retardant coating from falling on the frame and can also collect and recycle the fire-retardant coating, thereby reducing the risk of the fire-retardant coating falling on the conveying roller and contaminating the plate, reducing the waste of fire-retardant coating and reducing costs. On the other hand, the fire-retardant coating can be applied to the side wall of the plate while spraying the fire-retardant coating on the upper surface of the plate, thereby reducing working time and improving spraying efficiency. Moreover, the method of applying the fire-retardant coating by squeezing the rotating roller can improve the smoothness of the fire-retardant coating on the side wall of the plate.

[0025] 2. The setting of the sliding rod and the fixed cylinder can not only support the support frame but also guide the movement of the support frame; the setting of the compression springs on both sides can, on the one hand, adjust the position of the plate entering between the two support frames to make it in the middle position, and can guide the transportation of the plate, reducing the risk of the plate being offset; on the other hand, it can press the plate between the rotating rollers, making it convenient for the plate to drive the rotating rollers to rotate during the transmission process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application;

[0027] Figure 2This is a schematic diagram showing the structure of the clamping assembly in the embodiment of the present application;

[0028] Figure 3 This is a schematic diagram showing the structure of a turbine and a worm in an embodiment of the present application;

[0029] Figure 4 This is a schematic diagram showing the structure of the eccentric rod in the embodiment of the present application;

[0030] Figure 5 For the embodiment of this application Figure 4 A partial enlarged view of area A in the middle.

[0031] 1. Frame; 11. Conveying roller; 12. Nozzle; 2. Support frame; 21. Conveying roller; 22. Blocking belt; 23. Collecting bin; 24. Scraper; 3. Transmission mechanism; 31. Rotating roller; 32. Clamping assembly; 321. Fixed cylinder; 322. Sliding rod; 323. Locking nut; 324. Compression spring; 33. Worm; 34. First driving wheel; 35. First driven wheel; 36. First belt; 37. Turbine; 4. Rotating rod; 41. Second belt; 5. Spraying mechanism; 51. Connecting pipe; 52. Second one-way valve; 53. Piston; 54. Connecting rod; 541. Connecting ring; 55. Eccentric rod. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the embodiments of the present application. Figure 1-Figure 5 , the technical scheme of the embodiment of the present application is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the present application, not all of the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0033] Reference Figures 1 to 3 A fire retardant coating spraying device for a composite fire-retardant expansion plate comprises a frame 1, on which a conveying roller 11 for conveying the plate is rotatably arranged, and a nozzle 12 is arranged above the frame 1. A fire retardant coating spraying device for a composite fire-retardant expansion plate also comprises a pair of support frames 2 arranged on the frame 1, and the nozzle 12 is located between the pair of support frames 2, each support frame 2 is provided with a blocking belt 22, a collecting bin 23 is fixedly connected to the support frame 2, and the collecting bin 23 is located below the blocking belt 22, and fire retardant coating is stored in the collecting bin 23, rotating rollers 31 are rotatably arranged on the support frames 2, and a clamping assembly 32 is arranged on the support frame 2, and the clamping assembly 32 can make the rotating rollers 31 on both sides cooperate to clamp the side wall of the plate, and a spraying mechanism 5 is arranged in the collecting bin 23, and the spraying mechanism 5 is used to spray the fire retardant coating in the collecting bin 23 onto the rotating roller 31.

[0034] When the nozzle 12 sprays the fire-retardant coating on the plate, the blocking belt 22 can block the fire-retardant coating that exceeds the range of the plate, and the fire-retardant coating that falls on the blocking belt 22 can slide along the blocking belt 22 and fall into the collecting bin 23. The spraying mechanism 5 can spray the fire-retardant coating in the collecting bin 23 onto the rotating roller 31. At the same time, the plate conveying can drive the rotating roller 31 to rotate, and the rotation of the rotating roller 31 can apply the fire-retardant coating on the side wall of the plate.

[0035] On the one hand, the present application can prevent the fire-retardant coating from falling onto the frame 1 and can also collect and recycle the fire-retardant coating, thereby reducing the risk of the fire-retardant coating falling onto the conveying roller 11 and contaminating the plate, reducing the waste of fire-retardant coating and reducing costs. On the other hand, the fire-retardant coating can be applied to the side wall of the plate while spraying the fire-retardant coating on the upper surface of the plate, thereby reducing working time and improving spraying efficiency. Moreover, the method of squeezing and applying the fire-retardant coating by rotating the roller 31 can improve the smoothness of the fire-retardant coating on the side wall of the plate.

[0036] Reference Figures 1 to 3 A plurality of conveying rollers 21 are rotatably arranged on the support frame 2, a blocking belt 22 is sleeved on the conveying rollers 21, a scraper 24 is arranged above the collecting bin 23, the scraper 24 can abut against the blocking belt 22, a transmission mechanism 3 is arranged on the support frame 2, and the transmission mechanism 3 can drive the conveying rollers 21 to rotate.

[0037] When spraying fire retardant coating on the plate, the transmission mechanism 3 can drive the conveying roller 21 to rotate. The rotation of the conveying roller 21 can enable the barrier belt 22 to convey. Through the transmission of the barrier belt 22 and the action of the scraper 24, the fire retardant coating that falls on the barrier belt 22 can be quickly moved and collected, thereby reducing the risk of the fire retardant coating drying on the barrier belt 22 and improving the collection effect of the fire retardant coating.

[0038] Reference Figures 1 to 3 The transmission mechanism 3 includes a worm 33 vertically arranged on the support frame 2, a first driving wheel 34 is fixedly sleeved on the rotating roller 31, a first driven wheel 35 is fixedly sleeved on the worm 33, a first belt 36 is jointly sleeved on the first driving wheel 34 and the first driven wheel 35, and a turbine 37 is fixedly sleeved on one end of the conveying roller 21 located below, and the turbine 37 can cooperate with the worm 33.

[0039] When the rotating roller 31 rotates, the rotating roller 31 drives the first driving wheel 34, the first driven wheel 35 and the worm 33 to rotate and drive the first belt 36 for transmission. The rotation of the worm 33 drives the turbine 37 to rotate. The rotation of the turbine 37 drives the conveying roller 21 located below to rotate. The conveying roller 21 located below rotates, drives other conveying rollers 21 to rotate and drives the blocking belt 22 for transmission.

[0040] Reference Figure 3A rotating rod 4 is rotatably provided at the bottom of the collecting bin 23, and the rotating rod 4 extends deep into the collecting bin 23. A second driving wheel is fixedly sleeved on the rotating roller 31, and a second driven wheel is fixedly sleeved on the rotating rod 4. A second belt 41 is jointly sleeved on the second driving wheel and the second driven wheel.

[0041] When the rotating roller 31 rotates, the rotating roller 31 drives the second driving wheel and the second driven wheel to rotate, and the rotation of the second driven wheel drives the rotating rod 4 to rotate. The rotation of the rotating rod 4 can stir the fire retardant coating in the collection bin 23, reducing the risk of fire retardant coating deposition.

[0042] Reference Figures 3 to 5 The spraying mechanism 5 includes a connecting pipe 51 arranged directly opposite to the rotating roller 31, and the end of the connecting pipe 51 away from the rotating roller 31 is deep into the collecting bin 23, a first one-way valve is installed at the end of the connecting pipe 51 close to the rotating roller 31, and the conducting direction of the first one-way valve is from the inside of the connecting pipe 51 to the outside of the connecting pipe 51, a second one-way valve 52 is installed below the connecting pipe 51, the second one-way valve 52 is located in the collecting bin 23, and the conducting direction of the second one-way valve 52 is from the collecting bin 23 to the connecting pipe 51, a piston 53 is slidably arranged in the connecting pipe 51, and a connecting rod 54 is hinged at one end of the piston 53 away from the rotating roller 31, and a connecting ring 541 is fixedly connected to the connecting rod 54, and an eccentric rod 55 is fixedly connected to one end of the rotating rod 4 located in the collecting bin 23, and the connecting ring 541 is rotatably sleeved on the eccentric rod 55.

[0043] When the rotating rod 4 rotates, the rotating rod 4 drives the eccentric rod 55 to rotate. The rotation of the eccentric rod 55 can drive the piston 53 to move back and forth along the connecting pipe 51. The fire retardant paint in the collecting chamber 23 can enter the connecting pipe 51 through the second one-way valve 52 and be sprayed out from the first one-way valve. The sprayed fire retardant paint falls on the rotating roller 31.

[0044] Reference Figure 2 The clamping assembly 32 includes a fixed cylinder 321 fixedly connected to the frame 1, a sliding rod 322 fixedly connected to the support frame 2, the sliding rod 322 passes through the fixed cylinder 321, a thread is provided on the side of the sliding rod 322 away from the support frame 2, a locking nut 323 is threadedly connected to the side of the sliding rod 322 away from the support frame 2, a compression spring 324 is arranged between the frame 1 and the support frame 2, and the compression spring 324 is sleeved on the sliding rod 322.

[0045] The setting of the sliding rod 322 and the fixed cylinder 321 can not only support the support frame 2 but also guide the movement of the support frame 2; the setting of the compression springs 324 on both sides can, on the one hand, adjust the position of the plate entering between the two support frames 2 so that it is in the middle position, and can guide the transportation of the plate, reducing the risk of the plate being offset; on the other hand, it can press the plate between the rotating rollers 31, making it convenient for the plate to drive the rotating rollers 31 to rotate during the transmission process.

[0046] The implementation principle of the fire retardant coating spraying device for a composite fire retardant expansion plate in the embodiment of the present application is as follows:

[0047] When the conveying roller 11 conveys the plate and the nozzle 12 sprays the fire-retardant coating to spray the plate, the blocking belt 22 blocks the fire-retardant coating that exceeds the range of the plate. At the same time, the movement of the plate drives the rotating roller 31 to rotate, and the rotation of the rotating roller 31 drives the worm 33 and the rotating rod 4 to rotate. The rotation of the worm 33 drives the turbine 37 to rotate, and the rotation of the turbine 37 drives the conveying roller 21 to rotate and drives the blocking belt 22 to transport. Then the scraper 24 scrapes the fire-retardant coating on the blocking belt 22, and the fire-retardant coating falls into the collecting bin 23.

[0048] When the rotating rod 4 rotates, the rotating rod 4 drives the eccentric rod 55 to rotate, and the rotation of the eccentric rod 55 drives the piston 53 to reciprocate along the connecting pipe 51. The fire retardant coating in the collecting bin 23 enters the connecting pipe 51 through the second one-way valve 52 and is sprayed out from the first one-way valve. The sprayed fire retardant coating falls on the rotating roller 31, and then the rotating roller 31 applies the fire retardant coating on the side wall of the plate when it contacts the side wall of the plate.

[0049] In the present application, unless otherwise clearly stipulated 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 integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0050] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A fire retardant coating spraying device for a composite fire retardant expansion board, comprising a frame (1), a conveying roller (11) for conveying the board being rotatably arranged on the frame (1), a spray head (12) being arranged above the frame (1), characterized in that: Also includes: A pair of support frames (2) are arranged on the frame (1), and the nozzle (12) is located between the pair of support frames (2), each of the support frames (2) is provided with a blocking belt (22), a collecting bin (23) is fixedly connected to the support frame (2), and the collecting bin (23) is located below the blocking belt (22), and the collecting bin (23) stores fire retardant paint; A rotating roller (31) is rotatably arranged on the support frame (2); a pressing assembly (32) is arranged on the support frame (2); the pressing assembly (32) can enable the rotating rollers (31) on both sides to cooperate with each other to press against the side walls of the plate; a spraying mechanism (5) is arranged in the collecting bin (23); the spraying mechanism (5) is used to spray the fire retardant coating in the collecting bin (23) onto the rotating roller (31); A plurality of conveying rollers (21) are rotatably arranged on the support frame (2), a blocking belt (22) is sleeved on the conveying rollers (21), and a transmission mechanism (3) is arranged on the support frame (2), and the transmission mechanism (3) can drive the conveying rollers (21) to rotate; The transmission mechanism (3) comprises: A worm (33) is vertically arranged on the support frame (2); a first driving wheel (34) is fixedly sleeved on the rotating roller (31); a first driven wheel (35) is fixedly sleeved on the worm (33); and a first belt (36) is sleeved on both the first driving wheel (34) and the first driven wheel (35); A turbine (37) is fixedly sleeved on one end of one of the conveying rollers (21), and the turbine (37) can cooperate with the worm (33).

2. A fire retardant coating spraying device for a composite fire retardant expansion plate according to claim 1, characterized in that: The blocking strip (22) is arranged obliquely on a side close to the plate.

3. A fire retardant coating spraying device for a composite fire retardant expansion plate according to claim 1, characterized in that: A scraper (24) is provided above the collecting bin (23), and the scraper (24) can abut against the blocking belt (22).

4. A fire retardant coating spraying device for a composite fire retardant expansion plate according to claim 1, characterized in that: A rotating rod (4) is rotatably provided at the bottom of the collecting bin (23), the rotating rod (4) extending deep into the collecting bin (23), a second driving wheel is fixedly sleeved on the rotating roller (31), a second driven wheel is fixedly sleeved on the rotating rod (4), and a second belt (41) is sleeved on both the second driving wheel and the second driven wheel.

5. A fire retardant coating spraying device for a composite fire retardant expansion plate according to claim 4, characterized in that: The spraying mechanism (5) comprises a connecting pipe (51) arranged opposite to the rotating roller (31), and one end of the connecting pipe (51) away from the rotating roller (31) extends deep into the collecting bin (23), one end of the connecting pipe (51) close to the rotating roller (31) is provided with a first one-way valve, and a second one-way valve (52) is provided below the connecting pipe (51), a piston (53) is slidably arranged in the connecting pipe (51), one end of the piston (53) away from the rotating roller (31) is hinged to a connecting rod (54), and a connecting ring (541) is fixedly connected to the connecting rod (54), and one end of the rotating rod (4) located in the collecting bin (23) is fixedly connected to an eccentric rod (55), and the connecting ring (541) is rotatably sleeved on the eccentric rod (55).

6. A fire retardant coating spraying device for a composite fire retardant expansion plate according to claim 1, characterized in that: The clamping assembly (32) comprises a fixing cylinder (321) fixedly connected to the frame (1); a sliding rod (322) fixedly connected to the support frame (2); the sliding rod (322) passes through the fixing cylinder (321); a thread is formed on a side of the sliding rod (322) away from the support frame (2); a locking nut (323) is threadedly connected to a side of the sliding rod (322) away from the support frame (2); a compression spring (324) is provided between the frame (1) and the support frame (2); and the compression spring (324) is sleeved on the sliding rod (322).

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