Self-driven belt power-assisted counterweight tensioning device

Abstract

The utility model discloses a self-driven belt power-assisted counterweight tensioning device which comprises a fixed seat and a matching vertical plate, a matching groove is vertically formed in the fixed seat, and the matching vertical plate penetrates through the matching groove in a vertical sliding fit mode. The bottom of the matching vertical plate is provided with a balance weight tensioning assembly used for conducting tensioning and power-assisted operation on the conveying belt. The conveying belt tensioning device has the beneficial effects that the counterweight tensioning assembly is arranged at the bottom of the matching vertical plate, so that the tensioning wheel can be upwarped to tension the conveying belt in a mode that the counterweight block of the counterweight tensioning assembly drives the mounting arm to rotate around the supporting shaft, and the tensioning mode of the conveying belt is simple and easy to realize; and meanwhile, due to the fact that the elastic lining of the tensioning wheel is pressed on the surface of the conveying belt, assistance can be conducted on the conveying process of the conveying belt in the mode that the driving motor drives the tensioning wheel to roll, and the conveying stability of the conveying belt can be improved.

Description

Technical Field

[0001] The utility model relates to the field of belt transmission auxiliary components, in particular to a self-driven belt power-assisted counterweight tensioning device. Background Art

[0002] In the process of automated tobacco processing, belt conveyors are a commonly used device. Cargo transportation through different belt conveyors can improve the efficiency of automated tobacco production. In the process of tobacco rod transportation, in order to improve the space utilization rate of the production workshop, the belt conveyors used to transport tobacco rods are generally arranged along the roof. This arrangement is called "top conveying". The advantage of top conveying is that it can make full use of the vertical space of the workshop, making the space in the workshop more open, which is convenient for the layout of other equipment and the work of operators.

[0003] In the top conveying system, the belt conveyor wheel is installed on a suspended bracket and connected to the motor through the wheel axle and the drive system for transporting the tobacco rods over long distances. However, due to the need for long-distance transportation, the overall length of the belt will be longer, resulting in problems such as belt looseness, belt vibration and low transmission efficiency during the belt transmission process. These problems will lead to unstable tobacco rod transmission and reduced tobacco rod transmission efficiency, affecting the overall production efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a self-driven belt-assisted counterweight tensioning device in order to solve the above-mentioned problem. A counterweight tensioning assembly is installed at the bottom of the matching vertical plate, so that the counterweight block of the counterweight tensioning assembly drives the mounting arm to rotate around the support shaft so that the tensioning wheel can be tilted up and the belt can be tensioned. The tensioning method of the transmission belt is simple and easy to implement, as described below for details.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The utility model provides a self-driven belt-assisted counterweight tensioning device, comprising a fixed seat and a matching vertical plate, wherein the fixed seat is vertically provided with a matching groove, and the matching groove is vertically slidably inserted through the matching vertical plate, and a counterweight tensioning assembly for tensioning and assisting the conveyor belt is installed at the bottom of the matching vertical plate;

[0007] An adjustment locking assembly is installed in front of the fixing seat, which is used to adjust and lock the position height of the counterweight tensioning assembly through the adjustment locking assembly.

[0008] Preferably, the counterweight tensioning assembly includes a bearing seat and a mounting arm, the bearing seat is fixedly installed on the front bottom of the matching vertical plate, the inner ring of the slewing bearing built into the rear of the bearing seat is coaxially fixed with a support shaft arranged in the longitudinal direction, and the rear end of the support shaft passes through the matching vertical plate in a sliding fit, the support shaft extends out of the rear of the matching vertical plate and passes through the mounting arm in a longitudinal sliding fit, and the parts of the support shaft passing through the front and rear surfaces of the mounting arm are coaxially engaged with clamping nuts, the front and rear end surfaces of one end of the mounting arm are longitudinally fixed with connecting rods through connecting sleeves, and the outer ends of the connecting rods are coaxially fixed with counterweight blocks, the front end of the other end of the mounting arm is longitudinally fixed with a driving motor, the motor shaft at the rear of the driving motor passes through the mounting arm in a longitudinal sliding fit and a tensioning wheel is coaxially fixed to the rear end.

[0009] Preferably, the length of a center line connecting the support shaft and the drive motor is smaller than the length of a center line connecting the support shaft and the counterweight block, so that the counterweight block can drive the mounting arm to tilt the tensioning wheel upward.

[0010] Preferably, the counterweight blocks are all solid iron discs, the connecting rods are coaxially welded with the corresponding counterweight blocks, and the connecting rods are coaxially interference fit with the corresponding connecting sleeves.

[0011] Preferably, an elastic bushing made of a buffer material is coaxially fixed to the periphery of the tensioning wheel.

[0012] Preferably, the adjustment locking assembly includes a limiting hole and a mounting hole, a plurality of the limiting holes are longitudinally opened on the front of the matching vertical plate, and the plurality of limiting holes are located in the same vertical direction, a mounting hole is longitudinally opened on the middle front of the fixing seat, the mounting hole is vertically connected to the matching groove, and the mounting hole is longitudinally coaxial with one of the limiting holes, a limiting rod is longitudinally inserted through the mounting hole in a coaxial sliding fit manner, and the rear end of the limiting rod is coaxially sliding fit with the corresponding limiting hole, the front end of the limiting rod extends out of the front of the fixing seat and is coaxially fixed with a handle, the limiting rod is located between the handle and the front of the fixing seat and is fitted with a spring in the coaxial gap, and the two ends of the spring are respectively fixedly connected to the handle and the front of the fixing seat.

[0013] Preferably, the plurality of limiting holes are evenly distributed in the vertical direction, and the horizontal cross-sectional shapes of the matching vertical plate and the matching groove are both rectangular.

[0014] Preferably, a handle is installed on the top surface of the matching vertical plate so as to smoothly pass through the matching groove vertically.

[0015] Preferably, a connecting back plate is unfolded and fixed on the back side of the fixing seat, and connecting through holes are provided at the four corners of the connecting back plate.

[0016] The above-mentioned self-driven belt-assisted counterweight tensioning device is used, specifically in the process of tensioning and assisting the transmission belt, since the counterweight tensioning assembly is installed at the bottom of the matching vertical plate, the fixed seat is installed on the outside of the frame of the transmission belt and the tensioning wheel of the counterweight tensioning assembly is located below the transmission belt and close to the lower surface of the transmission belt, so that the counterweight block of the counterweight tensioning assembly drives the mounting arm to rotate around the support shaft so that the tensioning wheel can be tilted up to tension the transmission belt, and the transmission belt is tensioned. The transmission belt tensioning method is simple and easy to implement. At the same time, since the elastic bushing of the tensioning wheel is pressed against the surface of the transmission belt, and then the driving motor drives the tensioning wheel to roll, the conveying process of the transmission belt can be assisted, which is beneficial to improve the transmission stability of the transmission belt. In the process of laying out the counterweight tensioning assembly, the matching vertical plate slides vertically along the matching groove The vertical position height of the counterweight tensioning assembly can be adjusted by shifting and longitudinally sliding the limit rod with the limit holes of different position heights. The vertical position height adjustment method of the counterweight tensioning assembly is simple and easy to implement, which is convenient for adjusting the counterweight tensioning assembly to a suitable position height for use, thereby improving the adaptability of the counterweight tensioning assembly. When the counterweight tensioning assembly needs to be removed for inspection and maintenance later, one hand holds the handle on the top of the matching vertical plate, and the other hand only needs to hold the handle outward and pull the limit rod out of the limiting hole through the stretching of the spring. Then, the matching vertical plate can be vertically slid down along the matching groove and the top of the matching vertical plate can be separated from the matching groove by vertical sliding. The separation method of the matching vertical plate and the matching groove is simple and easy to operate, and then it is convenient to remove the matching vertical plate and the counterweight tensioning assembly together for inspection and maintenance.

[0017] The beneficial effects are as follows: 1. The utility model is provided with a counterweight tensioning assembly installed at the bottom of the matching vertical plate, so that the counterweight block of the counterweight tensioning assembly drives the mounting arm to rotate around the support shaft so that the tensioning wheel can be tilted upward to tension the transmission belt, and the tensioning method of the transmission belt is simple and easy to implement. At the same time, because the elastic bushing of the tensioning wheel is pressed against the surface of the transmission belt, the transmission process of the transmission belt can be assisted by the driving motor to drive the tensioning wheel to roll, which is beneficial to improving the transmission stability of the transmission belt;

[0018] 2. The vertical position height of the counterweight tensioning assembly can be adjusted by vertically sliding the vertical plate along the matching groove and longitudinally slidingly matching the limiting rod with the limiting holes at different position heights. The vertical position height adjustment method of the counterweight tensioning assembly is simple and easy to implement, which is convenient for adjusting the counterweight tensioning assembly to a suitable position height for use, thereby improving the adaptability of the counterweight tensioning assembly;

[0019] 3. Simply pull the limit rod out of the limit hole to allow the top of the matching vertical plate to slide vertically and separate from the matching groove. The separation of the matching vertical plate and the matching groove is simple and easy to operate, and then it is convenient to remove the matching vertical plate and the counterweight tensioning assembly together for inspection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is an overall axonometric schematic diagram of the utility model;

[0022] Figure 2 This utility model Figure 1 Cross-section diagram of Figure 1 ;

[0023] Figure 3 This utility model Figure 1 Cross-section diagram of Figure 2 ;

[0024] Figure 4 This utility model Figure 1 Cross-section diagram of Figure 3 ;

[0025] Figure 5 This utility model Figure 1 The front view of the external image;

[0026] Figure 6 This utility model Figure 1 Dorsal external view of ;

[0027] Figure 7 This utility model Figure 1 The left external view of

[0028] Figure 8 This utility model Figure 1 The right external view of

[0029] Fig. 9This utility model Figure 1 External view from above.

[0030] The following are the descriptions of the reference numerals:

[0031] 1. Matching vertical plate; 101. Handle; 2. Adjustment locking assembly; 201. Limiting hole; 202. Mounting hole; 203. Spring; 204. Handle; 205. Limiting rod; 3. Counterweight tensioning assembly; 301. Tensioning wheel; 302. Driving motor; 303. Bearing seat; 304. Support shaft; 305. Mounting arm; 306. Counterweight block; 307. Elastic bushing; 308. Motor shaft; 309. Pressing nut; 3010. Connecting rod; 3011. Connecting sleeve; 4. Fixed seat; 401. Matching groove; 5. Connecting back plate; 501. Connecting through hole. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0033] See also Figure 1-Figure 9As shown, the utility model provides a self-driven belt-assisted counterweight tensioning device, including a fixed seat 4 and a matching vertical plate 1, the fixed seat 4 is vertically provided with a matching groove 401, and the matching groove 401 is inserted through the matching vertical plate 1 in a vertical sliding manner, and a counterweight tensioning assembly 3 for tensioning and assisting the transmission belt is installed at the bottom of the matching vertical plate 1. Specifically, the counterweight tensioning assembly 3 includes a bearing seat 303 and a mounting arm 305, and the bearing seat 303 is fixedly installed at the front bottom of the matching vertical plate 1, and the inner ring of the slewing bearing built into the rear part of the bearing seat 303 is coaxially fixed with a support shaft 304 arranged in the longitudinal direction, and the rear end of the support shaft 304 passes through the matching vertical plate 1 in a sliding manner, and the support shaft 304 extends out of the rear part of the matching vertical plate 1 and passes through the mounting arm 305 in a longitudinal sliding manner, and the parts of the support shaft 304 that pass through the front and rear surfaces of the mounting arm 305 are coaxially meshed with a pressure The nut 309 is tightened, and the front and rear end surfaces of one end of the mounting arm 305 are longitudinally fixed with a connecting rod 3010 through a connecting sleeve 3011, and the outer ends of the connecting rod 3010 are coaxially fixed with a counterweight block 306, and the other end of the mounting arm 305 is longitudinally fixed with a driving motor 302 in front, and the motor shaft 308 at the rear of the driving motor 302 passes through the mounting arm 305 in a longitudinal sliding fit manner, and a tensioning wheel 301 is coaxially fixed to the rear end. The purpose of this arrangement is to drive the mounting arm 305 to rotate around the support shaft 304 by the counterweight block 306 of the counterweight tensioning assembly 3, so that the tensioning wheel 301 can be tilted up and the transmission belt can be tensioned. The tensioning method of the transmission belt is simple and easy to implement. At the same time, because the elastic bushing 307 of the tensioning wheel 301 is pressed against the surface of the transmission belt, the transmission belt can be conveyed by driving the tensioning wheel 301 to roll by the driving motor 302.

[0034] See also Figure 1-Figure 4As shown, an adjustment locking assembly 2 is installed on the front of the fixed seat 4, which is used to adjust and lock the position height of the counterweight tensioning assembly 3 by adjusting the locking assembly 2. Specifically, the adjustment locking assembly 2 includes a limiting hole 201 and a mounting hole 202. A plurality of limiting holes 201 are provided in the longitudinal direction on the front of the matching vertical plate 1, and the plurality of limiting holes 201 are all located in the same vertical direction. A mounting hole 202 is provided in the longitudinal direction in the middle of the front of the fixed seat 4. The mounting hole 202 is vertically connected with the matching groove 401, and the mounting hole 202 is longitudinally coaxial with one of the limiting holes 201. The limiting rod 205 is inserted into the mounting hole 202 in the longitudinal direction in a coaxial sliding manner, and the rear end of the limiting rod 205 is coaxially slidably matched with the corresponding limiting hole 201, and the front end of the limiting rod 205 extends out of the front of the fixed seat 4 and A handle 204 is coaxially fixed, and a limit rod 205 is located in a partial coaxial gap between the handle 204 and the front of the fixed seat 4, and a spring 203 is cooperated with the two ends of the spring 203, and the handle 204 and the front of the fixed seat 4 are respectively fixedly connected. The effect of such a setting is that, first, the vertical position height of the counterweight tensioning assembly 3 can be adjusted by vertically sliding the matching vertical plate 1 along the matching groove 401 and longitudinally slidingly cooperating with the limit rod 205 with the limiting holes 201 of different position heights. The vertical position height adjustment method of the counterweight tensioning assembly 3 is simple and easy to implement. At the same time, only the limit rod 205 needs to be pulled out of the limiting hole 201 to make the top of the matching vertical plate 1 separate from the matching groove 401 by sliding down vertically. The separation method of the matching vertical plate 1 and the matching groove 401 is simple and easy to operate.

[0035] See also Figure 1-Figure 4As shown, the following optimizations are respectively performed on the counterweight tensioning assembly 3, the adjustment locking assembly 2, the matching vertical plate 1 and the fixing seat 4. Specifically, with respect to the counterweight tensioning assembly 3, the length of the center line connecting the support shaft 304 and the driving motor 302 is smaller than the length of the center line connecting the support shaft 304 and the counterweight block 306, so that the counterweight block 306 can drive the mounting arm 305 to tilt the tensioning wheel 301 upward. With this arrangement, it is convenient for the parts of the mounting arms 305 located on both sides of the support shaft 304 to form a lever force structure, and the long force arm of the lever force structure is located at the part where the counterweight block 306 is located, thereby ensuring that the counterweight block 306 can drive the tensioning wheel 301 through the mounting arm 305. 1 is tilted upward to tension the transmission belt, and the optional counterweights 306 are all solid iron discs, the connecting rod 3010 and the corresponding counterweights 306 are coaxially welded, the connecting rod 3010 and the corresponding connecting sleeve 3011 are coaxially interference fit, and the connecting rod 3010 and the corresponding counterweights 306 are coaxially welded and fixed, so that the counterweights 306 have enough dead weight to drive the tensioning wheel 301 to tilt upward through the mounting arm 305 to tension the transmission belt. Further, optionally, an elastic bushing 307 of a buffer material is coaxially fixed to the periphery of the tensioning wheel 301, so that the elastic bushing 307 can be pressed and contacted on the surface of the transmission belt to stably assist the transmission belt.

[0036] Specifically for the adjustment locking assembly 2, a plurality of limit holes 201 are evenly distributed in the vertical direction, and the horizontal cross-sectional shapes of the matching vertical plate 1 and the matching groove 401 are both rectangular. With such an arrangement, firstly, it is convenient for the limit rod 205 to have a certain spacing regularity to follow when longitudinally slidingly cooperating with the limit holes 201 at different positions, and at the same time, it is convenient for the counterweight tensioning assembly 3 to have a certain spacing regularity to follow when adjusting the vertical position height, and it is convenient for the matching vertical plate 1 and the matching groove 401 to have a good positioning guide design when vertically slidingly cooperating. As for the matching vertical plate 1 and the fixed seat 4, a handle 101 that can smoothly pass through the matching groove 401 vertically is installed on the top surface of the matching vertical plate 1, so as to drive the matching vertical plate 1 to slide vertically along the matching groove 401 by holding the handle 101 and applying force, thereby preventing the matching vertical plate 1 and the counterweight tensioning assembly 3 from directly falling to the ground due to their own weight. Further optionally, a connecting back plate 5 is unfolded and fixed on the back side of the fixed seat 4, and connecting through holes 501 are opened at the four corners of the connecting back plate 5. With this arrangement, the fixing seat 4 can be firmly fixed to the outer side of the frame of the conveyor belt by adding bolts to the installation position through the connecting through holes 501 of the connecting back plate 5.

[0037] By adopting the above structure, specifically in the process of tensioning and assisting the conveyor belt, since a counterweight tensioning assembly 3 is installed at the bottom of the matching vertical plate 1, the fixed seat 4 is installed on the outside of the frame of the conveyor belt and the tensioning wheel 301 of the counterweight tensioning assembly 3 is located below the conveyor belt and close to the lower surface of the conveyor belt, so that the counterweight block 306 of the counterweight tensioning assembly 3 drives the mounting arm 305 to rotate around the support shaft 304, so that the tensioning wheel 301 can be tilted up and the conveyor belt can be tensioned. The tensioning method of the conveyor belt is simple and easy to implement. At the same time, since the elastic bushing 307 of the tensioning wheel 301 is pressed against the surface of the conveyor belt, the tensioning wheel 301 is driven to roll by the driving motor 302, so that the conveying process of the conveyor belt can be assisted, which is beneficial to improving the conveying stability of the conveyor belt. In the process of laying out the counterweight tensioning assembly 3, the matching vertical plate 1 slides vertically along the matching groove 401 and passes through the limiting The vertical position height of the counterweight tensioning assembly 3 can be adjusted by longitudinally slidingly cooperating with the limiting holes 201 of different position heights. The vertical position height adjustment method of the counterweight tensioning assembly 3 is simple and easy to implement, which is convenient for adjusting the counterweight tensioning assembly 3 to a suitable position height for use, thereby improving the adaptability of the counterweight tensioning assembly 3. When the counterweight tensioning assembly 3 needs to be removed for inspection and maintenance later, one hand holds the handle 101 at the top of the matching vertical plate 1, and then the other hand only needs to hold the handle 204 outward and pull the limiting rod 205 out of the limiting hole 201 through the stretching of the spring 203, and then the matching vertical plate 1 can slide vertically along the matching groove 401 and the top of the matching vertical plate 1 can be separated from the matching groove 401 by vertical sliding. The separation method of the matching vertical plate 1 and the matching groove 401 is simple and easy to operate, and then it is convenient to remove the matching vertical plate 1 and the counterweight tensioning assembly 3 together for inspection and maintenance.

[0038] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A self-driven belt-assisted counterweight tensioning device, comprising a fixing seat (4) and a matching vertical plate (1), characterized in that: The fixing seat (4) is vertically provided with a matching groove (401), and the matching groove (401) is inserted through the matching vertical plate (1) in a vertical sliding manner, and a counterweight tensioning assembly (3) for tensioning and assisting the conveyor belt is installed at the bottom of the matching vertical plate (1); An adjustment locking assembly (2) is installed in front of the fixing seat (4) for adjusting and locking the position height of the counterweight tensioning assembly (3) through the adjustment locking assembly (2).

2. A self-driven belt-assisted counterweight tensioning device according to claim 1, characterized in that: The counterweight tensioning assembly (3) comprises a bearing seat (303) and a mounting arm (305); the bearing seat (303) is fixedly mounted on the front bottom of the matching vertical plate (1); the inner ring of the slewing bearing built into the rear of the bearing seat (303) is coaxially fixed with a support shaft (304) arranged in the longitudinal direction, and the rear end of the support shaft (304) passes through the matching vertical plate (1) in a sliding fit manner; the support shaft (304) extends out of the rear of the matching vertical plate (1) and passes through the mounting arm (305) in a longitudinal sliding fit manner; and the support shaft (304) passes through the matching vertical plate (1) The front and rear surfaces of the mounting arm (305) are coaxially meshed with a clamping nut (309); the front and rear end surfaces of one end of the mounting arm (305) are longitudinally fixed with a connecting rod (3010) through a connecting sleeve (3011); and the outer end of the connecting rod (3010) is coaxially fixed with a counterweight (306); the front end of the other end of the mounting arm (305) is longitudinally fixed with a driving motor (302); the motor shaft (308) at the rear of the driving motor (302) passes through the mounting arm (305) in a longitudinal sliding fit manner, and a tensioning wheel (301) is coaxially fixed at the rear end.

3. A self-driven belt-assisted counterweight tensioning device according to claim 2, characterized in that: The length of the center line connecting the support shaft (304) and the driving motor (302) is smaller than the length of the center line connecting the support shaft (304) and the counterweight block (306), so that the counterweight block (306) can drive the mounting arm (305) to tilt the tension wheel (301) upward.

4. A self-driven belt-assisted counterweight tensioning device according to claim 3, characterized in that: The counterweight blocks (306) are all solid iron discs, the connecting rods (3010) and the corresponding counterweight blocks (306) are coaxially welded, and the connecting rods (3010) and the corresponding connecting sleeves (3011) are coaxially interference fit.

5. A self-driven belt-assisted counterweight tensioning device according to claim 4, characterized in that: An elastic bushing (307) made of a buffer material is coaxially fixed to the periphery of the tension wheel (301).

6. A self-driven belt-assisted counterweight tensioning device according to any one of claims 2 to 5, characterized in that: The adjusting locking assembly (2) comprises a limiting hole (201) and a mounting hole (202); a plurality of the limiting holes (201) are longitudinally provided on the front of the matching vertical plate (1), and the plurality of the limiting holes (201) are all located in the same vertical direction; a mounting hole (202) is longitudinally provided on the middle of the front of the fixing seat (4); the mounting hole (202) is vertically connected to the matching groove (401); the mounting hole (202) is longitudinally coaxially aligned with one of the limiting holes (201); and the mounting hole (202) is coaxially slidable. The limiting rod (205) is inserted in the longitudinal direction in a matching manner, and the rear end of the limiting rod (205) is coaxially slidably matched with the corresponding limiting hole (201), the front end of the limiting rod (205) extends out of the front of the fixing seat (4) and is coaxially fixed with a handle (204), and the limiting rod (205) is located in a part of the coaxial gap between the handle (204) and the front of the fixing seat (4) and is matched with a spring (203), and the two ends of the spring (203) are respectively fixedly connected to the handle (204) and the front of the fixing seat (4).

7. A self-driven belt-assisted counterweight tensioning device according to claim 6, characterized in that: The plurality of limiting holes (201) are evenly distributed in the vertical direction, and the horizontal cross-sectional shapes of the matching vertical plate (1) and the matching groove (401) are both rectangular.

8. A self-driven belt-assisted counterweight tensioning device according to claim 7, characterized in that: The top surface of the matching vertical plate (1) is provided with a handle (101) that can smoothly pass through the matching groove (401) vertically.

9. A self-driven belt-assisted counterweight tensioning device according to claim 7 or 8, characterized in that: A connecting back plate (5) is unfolded and fixed on the back side of the fixing seat (4), and connecting through holes (501) are provided at the four corners of the connecting back plate (5).

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