Orthopedic patient traction treatment angle adjusting device

Abstract

The utility model relates to traction treatment technical field, and disclose a kind of orthopedics patient traction treatment angle adjusting equipment, comprising: support component, angle adjusting component and lifting assembly, the angle adjusting component is by the square board being set in the both sides of A support plate and B hydraulic telescopic link constitute.The orthopedics patient traction treatment angle adjusting equipment, by the setting first U-shaped frame through C rotating plate and B hydraulic telescopic link connection lever fulcrum, after B support plate reaches the required inclination angle, stops B hydraulic telescopic link, so that its support patient need not limb traction limb, reach the traction force of patient required traction limb fine adjustment and inclination angle adjustment, to avoid the error of manual adjustment, accurately adjust traction angle, satisfy the accurate demand of traction force to different illness, and then control traction limb inclination angle and non-traction limb support angle respectively, angle adjustment is flexible and convenient, operation is efficient and positioning is stable.

Description

Technical Field

[0001] This utility model relates to the field of traction therapy technology, and in particular to a device for adjusting the traction therapy angle for orthopedic patients. Background Technology

[0002] Orthopedic traction angle adjustment devices are used to adjust the traction angle during traction therapy. They can precisely adjust the traction direction and angle according to the patient's treatment needs, ensuring that the traction force acts on the affected limb along the appropriate path, thus improving treatment effectiveness. The device typically consists of an angle adjustment mechanism and a fixation device, and features easy operation and controllable angle adjustment range. It can provide personalized traction angle support for orthopedic patients with different conditions, assisting in treatment processes such as fracture reduction and deformity correction.

[0003] A surgical traction bed disclosed in publication number CN219501287U requires the use of a threaded tube to separate the limiting plate from the surgical traction bed. Then, the adjusting block is rotated to adjust the height of the limiting plate to be lower than the height of the surgical traction bed. Afterward, the patient simply lies on the surgical traction bed to receive treatment. During treatment, the operator rotates the threaded tube to push the connecting rod towards the surgical traction bed, causing the limiting plate to move on the surgical traction bed and apply pressure to both sides of the patient, thus fixing the patient's body. Therefore, it can prevent changes in the patient's position from affecting the treatment process.

[0004] However, this orthopedic traction bed has the following disadvantages:

[0005] (1) When patients use traction devices for traction treatment, there may be errors in the manual adjustment of the equipment by the staff, which makes it difficult to meet the precise traction force requirements of different conditions.

[0006] (2) When patients use traction devices for traction therapy, the traction devices may shake or tilt during adjustment, which may affect the traction effect and cause secondary injury to the limbs. Utility Model Content

[0007] (a) Technical problems to be solved

[0008] The technical problem solved by this utility model is to provide a highly practical orthopedic patient traction treatment angle adjustment device that is simple to operate and has a relatively simple structure. This solves the problems mentioned in the background art, such as the possibility of errors in manual adjustment by staff when patients use traction devices for traction treatment, which makes it difficult to meet the precise traction force requirements of different conditions, and the possibility of the traction device shaking or tilting during adjustment, which affects the traction effect and may lead to secondary limb injury.

[0009] (II) Technical Solution

[0010] To achieve the above objectives, this utility model is implemented through the following technical solution: an orthopedic patient traction treatment angle adjustment device, comprising: a support component, an angle adjustment component and a lifting component, wherein the support component is composed of an A support plate and a second U-shaped frame, one end of the A support plate is rotatably connected to a B support plate, one end of the bottom of the A support plate is fixedly connected to a first U-shaped frame, and the other end of the bottom of the A support plate is fixedly connected to a second U-shaped frame;

[0011] The angle adjustment assembly consists of square plates on both sides of support plate A and hydraulic telescopic rod B. A connecting frame A is fixedly connected to the top of the square plates, and a fixing slot A is fixedly connected to the back of the square plates. A connecting frame B is rotatably connected to the inner wall of the fixing slot A. A connecting rod A is fixedly connected to one end of the connecting frame B, and a hydraulic telescopic rod A is fixedly connected to one end of the connecting rod A. A rotating plate A is fixedly connected to one end of the hydraulic telescopic rod A. The inner wall of the rotating plate A is rotatably connected to a second U-shaped frame. A rotating plate B is fixedly connected to the top of the connecting frame A and the connecting frame B. A turntable is rotatably connected to the inner wall of the rotating plate B. A connecting rope is rotatably connected to the surface of the turntable. A placement frame is fixedly connected to one end of the connecting rope, and a weight block is movably connected to the other end of the connecting rope. A rotating plate C is rotatably connected to the surface of the first U-shaped frame. A hydraulic telescopic rod B is fixedly connected to one end of the rotating plate C, and one end of the hydraulic telescopic rod B is fixedly connected to support plate B.

[0012] The lifting assembly consists of a C-fixed groove block and a C-hydraulic telescopic rod located at one end of the bottom of support plate A. An A-rotating rod is rotatably connected to the inner wall of the C-fixed groove block. One end of the A-rotating rod is rotatably connected to a D-fixed groove block. A support plate is fixedly connected to the bottom of the D-fixed groove block. Sliding grooves are provided at both ends of the top of the C-support plate. A slider is slidably connected to the inner wall of the sliding groove. An E-fixed groove block is fixedly connected to the top of the slider. A B-rotating rod is rotatably connected to the inner wall of the E-fixed groove block. One end of the B-rotating rod is rotatably connected to an F-fixed groove block. The top of the F-fixed groove block is fixedly connected to support plate A. A G-fixed groove block is fixedly connected to the top of support plate A. A D-rotating plate is rotatably connected to the inner wall of the G-fixed groove block. A C-hydraulic telescopic rod is fixedly connected to one end of the D-rotating plate. A round rod is fixedly connected to one end of the B-rotating rod. One end of the C-hydraulic telescopic rod is fixedly connected to the round rod.

[0013] Optionally, both sides of one end of the A support plate are fixedly connected to B fixing slot blocks. Both the B fixing slot blocks and one end of the B support plate are provided with A circular holes. The inner wall of the A circular holes is rotatably connected to A limiting rods, which serve to rotate the A limiting rods through the A circular holes.

[0014] Optionally, a soft pad A is fixedly connected to the top of the support plate A, and a soft pad B is fixedly connected to the top of the support plate B. The soft pad A serves to cushion the support plate A.

[0015] Optionally, both the A fixing slot and the B connecting frame have a B circular hole at one end, and a B limiting rod is rotatably connected to the inner wall of the B circular hole. Both ends of the top of the B rotating plate have a C circular hole, and a C limiting rod is rotatably connected to the inner wall of the C circular hole. One end of the C limiting rod is fixedly connected to the turntable, and the B circular hole serves to rotate the B limiting rod.

[0016] Optionally, both the C fixing slot and the A rotating rod have a D circular hole at one end, and a D limiting rod is rotatably connected to the inner wall of the D circular hole. Both the D fixing slot and the A rotating rod have an F circular hole at the other end, and an F limiting rod is rotatably connected to the inner wall of the F circular hole. The D circular hole serves to rotate the D limiting rod.

[0017] Optionally, both the E fixing slot and the B rotating rod have a G circular hole at one end, and a G limiting rod is rotatably connected to the inner wall of the G circular hole. Both the F fixing slot and the B rotating rod have an H circular hole at the other end, and an H limiting rod is rotatably connected to the inner wall of the H circular hole. Both the A rotating rod and the B rotating rod have an I circular hole in the middle of their surfaces, and an I limiting rod is rotatably connected to the inner wall of the I circular hole. The G circular hole serves to rotate the G limiting rod.

[0018] (III) Beneficial Effects

[0019] This utility model provides a device for adjusting the traction treatment angle for orthopedic patients, which has the following beneficial effects:

[0020] 1. This orthopedic patient traction treatment angle adjustment device, through the setting of the angle adjustment component, allows the operator to first activate hydraulic telescopic rod A, which drives rotating plate A to rotate around the second U-shaped frame, causing connecting frame B to swing, which in turn drives the turntable to rotate. The limb requiring traction treatment is placed in the placement frame. The weight of the support block is transmitted to the limb through the connecting rope, achieving fine adjustment of the traction force. If it is necessary to change the traction force, a support block of different weights can be replaced. After reaching the required tilt angle, hydraulic telescopic rod A is stopped, and hydraulic telescopic rod B is activated, which drives supporting plate B to rotate. The first U-shaped frame is connected to hydraulic telescopic rod B through rotating plate C to form a lever fulcrum. After supporting plate B reaches the required tilt angle, hydraulic telescopic rod B is stopped, allowing it to support the limb of the patient that does not require traction. This achieves fine adjustment of the traction force and tilt angle of the limb requiring traction, thereby avoiding the error of manual adjustment, accurately adjusting the traction angle, and meeting the precise traction force requirements of different conditions. It can then control the tilt angle of the traction limb and the support angle of the non-traction limb separately. The angle adjustment is flexible and convenient, the operation is efficient, and the positioning is stable.

[0021] 2. This orthopedic patient traction treatment angle adjustment device, through the setting of the lifting component, allows the operator to first activate the C hydraulic telescopic rod, which drives the round rod to move, causing the B rotating rod to rotate around it within the E fixed slot. The E fixed slot slides horizontally within the C support plate's groove via a slider, causing the A rotating rod to rotate within the C and D fixed slots, thereby pushing the A support plate vertically up and down. Once the A support plate reaches the target height, the C hydraulic telescopic rod is stopped, ensuring height stability during traction. This achieves precise adaptation to the patient's height and treatment position requirements, ensuring stable and reliable support height during traction. It quickly matches different patient heights and treatment bed heights, enabling precise fine-tuning of the support platform height, avoiding the impact of height deviation on the traction effect, and ensuring platform stability during lifting and lowering. This reduces the patient's psychological burden and avoids the risk of traction angle errors or secondary limb injuries caused by tilting. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the support component structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the angle adjustment component structure of this utility model;

[0025] Figure 4 This is a schematic diagram of the B support plate structure of this utility model;

[0026] Figure 5 This is a schematic diagram of the lifting component structure of this utility model.

[0027] Figure Labels

[0028] 1. Support components; 101. Support plate A; 102. Support plate B; 103. First U-shaped frame; 104. Second U-shaped frame;

[0029] 2. Angle adjustment assembly; 201. Square plate; 202. A connecting frame; 203. B connecting frame; 204. A hydraulic telescopic rod; 205. Turntable; 206. Connecting rope; 207. Weight block; 208. B hydraulic telescopic rod;

[0030] 3. Lifting assembly; 301, C. Fixed groove block; 302, A. Rotating rod; 303, C. Support plate; 304. Sliding block; 305, B. Rotating rod; 306, C. Hydraulic telescopic rod. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0032] Please see Figures 1 to 5 This utility model provides a technical solution: an orthopedic patient traction treatment angle adjustment device, including: a support component 1, an angle adjustment component 2 and a lifting component 3; the support component 1 is composed of an A support plate 101 and a second U-shaped frame 104, one end of the A support plate 101 is rotatably connected to a B support plate 102, one end of the bottom of the A support plate 101 is fixedly connected to a first U-shaped frame 103, and the other end of the bottom of the A support plate 101 is fixedly connected to a second U-shaped frame 104;

[0033] The angle adjustment assembly 2 consists of square plates 201 on both sides of support plate A 101 and hydraulic telescopic rod B 208. A connecting frame A 202 is fixedly connected to the top of the square plates 201, and a fixing slot A is fixedly connected to the back of the square plates 201. A connecting frame B 203 is rotatably connected to the inner wall of the fixing slot A. One end of the connecting frame B 203 is fixedly connected to a connecting rod A, and one end of the connecting rod A is fixedly connected to a hydraulic telescopic rod A 204. One end of the hydraulic telescopic rod A 204 is fixedly connected to a rotating plate A, and the inner wall of the rotating plate A is rotatably connected to the second U-shaped frame 104. A B rotating plate is fixedly connected to the top of the connecting frame 202 and the B connecting frame 203. A turntable 205 is rotatably connected to the inner wall of the B rotating plate. A connecting rope 206 is rotatably connected to the surface of the turntable 205. One end of the connecting rope 206 is fixedly connected to a placement frame, and the other end is movably connected to a weight block 207. A C rotating plate is rotatably connected to the surface of the first U-shaped frame 103. A B hydraulic telescopic rod 208 is fixedly connected to one end of the C rotating plate. One end of the B hydraulic telescopic rod 208 is fixedly connected to the B support plate 102. Through the setting of the angle adjustment component 2, the worker first... First, activate hydraulic telescopic rod A 204, causing it to rotate rotating plate A around the second U-shaped frame 104, which in turn causes connecting frame B 203 to swing, thus rotating turntable 205. Place the limb requiring traction treatment into the placement frame. The weight of the weight block 207 is transmitted to the limb through connecting rope 206, allowing for fine adjustment of the traction force. To change the traction force, use weight blocks 207 of different weights. Once the desired tilt angle is achieved, stop hydraulic telescopic rod A 204 and then activate hydraulic telescopic rod B 208, causing support plate B 102 to rotate. The first U-shaped frame 103 is connected to the hydraulic telescopic rod 208 via the C rotating plate to form a lever fulcrum. After the B support plate 102 reaches the required tilt angle, the hydraulic telescopic rod 208 is stopped, so that it supports the limb of the patient that does not need traction. This achieves fine adjustment of the traction force and tilt angle of the limb that needs traction, thereby avoiding the error of manual adjustment, accurately adjusting the traction angle, meeting the precise traction force requirements of different conditions, and controlling the tilt angle of the traction limb and the support angle of the non-traction limb respectively. The angle adjustment is flexible and convenient, the operation is efficient and the positioning is stable.

[0034] The lifting assembly 3 consists of a C-fixed groove block 301 located at one end of the bottom of the A-support plate 101 and a C-hydraulic telescopic rod 306. An A-rotating rod 302 is rotatably connected to the inner wall of the C-fixed groove block 301. One end of the A-rotating rod 302 is rotatably connected to a D-fixed groove block. A C-support plate 303 is fixedly connected to the bottom of the D-fixed groove block. Sliding grooves are provided at both ends of the top of the C-support plate 303. A slider 304 is slidably connected to the inner wall of the sliding groove. An E-fixed groove block is fixedly connected to the top of the slider 304. A B-rotating rod 305 is rotatably connected to the inner wall of the E-fixed groove block. One end of the B-rotating rod 305 is rotatably connected to an F-fixed groove block. The top of the F-fixed groove block is fixedly connected to the A-support plate 101. A G-fixed groove block is fixedly connected to the top of the A-support plate 101. A D-rotating plate is rotatably connected to the inner wall of the G-fixed groove block. A C-hydraulic telescopic rod 306 is fixedly connected to one end of the D-rotating plate. A round rod is fixedly connected to one end of the C-hydraulic telescopic rod 306. The end is fixedly connected to the round rod. Through the setting of the lifting component 3, the staff first starts the C hydraulic telescopic rod 306, which drives the round rod to move, so that the B rotating rod 305 rotates around it in the E fixed groove. The E fixed groove slides horizontally in the groove of the C support plate 303 through the slider 304, which drives the A rotating rod 302 to rotate in the C fixed groove 301 and the D fixed groove, thereby pushing the A support plate 101 to rise and fall vertically. After the A support plate 101 reaches the target height, the C hydraulic telescopic rod 306 is stopped to ensure the height is stable during the traction process. This achieves the effect of accurately adapting to the patient's height and treatment position requirements, ensuring the stability and reliability of the support height during the traction process. This allows for quick matching of different patient heights and treatment bed heights, achieving precise fine-tuning of the support platform height, avoiding the impact of height deviation on the traction effect, and ensuring the platform is stable during lifting and lowering, reducing the patient's psychological burden, and avoiding the risk of traction angle errors or secondary limb injuries caused by tilting.

[0035] Both sides of one end of the support plate 101 are fixedly connected to the B fixing slot blocks. Both the B fixing slot blocks and one end of the support plate 102 are provided with A round holes. The inner wall of the A round hole is rotatably connected to the A limiting rod. The A round hole serves to rotate the A limiting rod.

[0036] A soft pad is fixedly connected to the top of support plate 101, and a soft pad is fixedly connected to the top of support plate 102. The soft pad serves to cushion support plate 101.

[0037] Both the fixed groove block A and the connecting bracket 203 B have a B round hole at one end. The inner wall of the B round hole is rotatably connected to the B limiting rod. Both ends of the top of the B rotating plate have a C round hole. The inner wall of the C round hole is rotatably connected to the C limiting rod. One end of the C limiting rod is fixedly connected to the turntable 205. The B round hole serves to rotate the B limiting rod.

[0038] Both the C-fixed groove block 301 and the A rotating rod 302 have a D-shaped hole at one end. The inner wall of the D-shaped hole is rotatably connected to a D-limiting rod. Both the D-fixed groove block and the A rotating rod 302 have an F-shaped hole at the other end. The inner wall of the F-shaped hole is rotatably connected to an F-limiting rod. The D-shaped hole serves to rotate the D-limiting rod.

[0039] Both the E fixed groove block and one end of the B rotating rod 305 have a G circular hole, and the inner wall of the G circular hole is rotatably connected to a G limiting rod. Both the F fixed groove block and the other end of the B rotating rod 305 have an H circular hole, and the inner wall of the H circular hole is rotatably connected to an H limiting rod. Both the A rotating rod 302 and the B rotating rod 305 have an I circular hole in the middle of their surfaces, and the inner wall of the I circular hole is rotatably connected to an I limiting rod. The G circular hole serves to rotate the G limiting rod.

[0040] In this invention, the working steps of the device are as follows:

[0041] First step: The staff first activates hydraulic telescopic rod A 204, which drives rotating plate A to rotate around the second U-shaped frame 104, causing connecting frame B 203 to swing, which in turn drives turntable 205 to rotate. The limb of the patient that needs traction treatment is placed in the placement frame. The weight of the weight block 207 is transmitted to the limb through connecting rope 206, realizing fine adjustment of traction force. If it is necessary to change the traction force, weight blocks 207 of different weights can be replaced. After reaching the required tilt angle, hydraulic telescopic rod A 204 is stopped, and hydraulic telescopic rod B 208 is activated, which drives supporting plate B 102 to rotate. The first U-shaped frame 103 is connected to hydraulic telescopic rod B 208 through rotating plate C to form a lever fulcrum. After supporting plate B 102 reaches the required tilt angle, hydraulic telescopic rod B 208 is stopped, so that it supports the limb of the patient that does not need traction.

[0042] The second step: The operator first activates hydraulic telescopic rod C 306, which moves the round rod, causing rotating rod B 305 to rotate around it in fixed slot E. Fixed slot E slides horizontally in the groove of support plate C 303 via slider 304, causing rotating rod A 302 to rotate in fixed slots C 301 and D, thereby pushing support plate A 101 to rise and fall vertically. After support plate A 101 reaches the target height, hydraulic telescopic rod C 306 is stopped to ensure height stability during traction.

[0043] It should be noted that the device structure and accompanying drawings of this utility model mainly describe the principle of this utility model. In terms of the technical aspects of this design principle, the setting of the power mechanism, power supply system and control system of the device is not fully described. However, under the premise that those skilled in the art understand the principle of the above utility model, the specific details of its power mechanism, power supply system and control system can be clearly understood. The control method in the application document is automatic control through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming.

[0044] All standard parts used can be purchased from the market, and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the structure and principle of the components known to those skilled in the art can be known by those skilled in the art through technical manuals or conventional experimental methods.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for adjusting the traction angle for orthopedic patients, comprising: The support assembly (1), angle adjustment assembly (2), and lifting assembly (3) are characterized in that: the support assembly (1) is composed of an A support plate (101) and a second U-shaped frame (104), one end of the A support plate (101) is rotatably connected to a B support plate (102), one end of the bottom of the A support plate (101) is fixedly connected to a first U-shaped frame (103), and the other end of the bottom of the A support plate (101) is fixedly connected to a second U-shaped frame (104); The angle adjustment assembly (2) consists of square plates (201) arranged on both sides of support plate A (101) and hydraulic telescopic rod B (208). A connecting frame A (202) is fixedly connected to the top of the square plate (201), and a fixing slot A is fixedly connected to the back of the square plate (201). A connecting frame B (203) is rotatably connected to the inner wall of the fixing slot A. A connecting rod A is fixedly connected to one end of the connecting frame B (203), and a hydraulic telescopic rod A (204) A is fixedly connected to one end of the connecting rod A. A rotating plate A is fixedly connected to one end of the hydraulic telescopic rod A (204). The inner wall of the rotating plate A is rotatably connected to the second U-shaped... The frame (104) has a B rotating plate fixedly connected to the top of the A connecting frame (202) and the B connecting frame (203). The B rotating plate has a turntable (205) rotatably connected to its inner wall. A connecting rope (206) is rotatably connected to the surface of the turntable (205). One end of the connecting rope (206) is fixedly connected to a placement frame, and the other end of the connecting rope (206) is movably connected to a weight block (207). The surface of the first U-shaped frame (103) has a C rotating plate rotatably connected to its surface. One end of the C rotating plate is fixedly connected to a B hydraulic telescopic rod (208), and one end of the B hydraulic telescopic rod (208) is fixedly connected to a B support plate (102). The lifting assembly (3) consists of a C fixed groove block (301) and a C hydraulic telescopic rod (306) located at one end of the bottom of the A support plate (101). The inner wall of the C fixed groove block (301) is rotatably connected to an A rotating rod (302). One end of the A rotating rod (302) is rotatably connected to a D fixed groove block. The bottom of the D fixed groove block is fixedly connected to a C support plate (303). Sliding grooves are provided at both ends of the top of the C support plate (303). A slider (304) is slidably connected to the inner wall of the sliding groove. The top of the slider (304) is fixedly connected to an E... A fixed groove block is provided. The inner wall of the E fixed groove block is rotatably connected to a B rotating rod (305). One end of the B rotating rod (305) is rotatably connected to an F fixed groove block. The top of the F fixed groove block is fixedly connected to an A support plate (101). The top of the A support plate (101) is fixedly connected to a G fixed groove block. The inner wall of the G fixed groove block is rotatably connected to a D rotating plate. One end of the D rotating plate is fixedly connected to a C hydraulic telescopic rod (306). One end of the B rotating rod (305) is fixedly connected to a round rod. One end of the C hydraulic telescopic rod (306) is fixedly connected to the round rod.

2. The orthopedic patient traction treatment angle adjustment device according to claim 1, characterized in that: Both sides of one end of the A support plate (101) are fixedly connected to B fixing slot blocks. Both the B fixing slot blocks and one end of the B support plate (102) are provided with A round holes. The inner wall of the A round holes is rotatably connected to A limiting rods.

3. The orthopedic patient traction treatment angle adjustment device according to claim 1, characterized in that: The top of the A support plate (101) is fixedly connected to the A pad, and the top of the B support plate (102) is fixedly connected to the B pad.

4. The orthopedic patient traction treatment angle adjustment device according to claim 1, characterized in that: Both the fixed groove block A and the connecting frame B (203) have a B circular hole at one end. The inner wall of the B circular hole is rotatably connected to a B limiting rod. Both ends of the top of the B rotating plate have a C circular hole. The inner wall of the C circular hole is rotatably connected to a C limiting rod. One end of the C limiting rod is fixedly connected to the turntable (205).

5. The orthopedic patient traction treatment angle adjustment device according to claim 1, characterized in that: Both the C-fixed groove block (301) and the A rotating rod (302) have a D-shaped hole at one end, and a D-limiting rod is rotatably connected to the inner wall of the D-shaped hole. Both the D-fixed groove block and the A rotating rod (302) have an F-shaped hole at the other end, and an F-limiting rod is rotatably connected to the inner wall of the F-shaped hole.

6. The orthopedic patient traction treatment angle adjustment device according to claim 1, characterized in that: The E fixing slot and the B rotating rod (305) are each provided with a G circular hole at one end, and a G limiting rod is rotatably connected to the inner wall of the G circular hole. The F fixing slot and the B rotating rod (305) are each provided with an H circular hole at the other end, and an H limiting rod is rotatably connected to the inner wall of the H circular hole. The A rotating rod (302) and the B rotating rod (305) are each provided with an I circular hole at the middle of their surfaces, and an I limiting rod is rotatably connected to the inner wall of the I circular hole.

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