Auxiliary traction device for traumatic orthopedic nursing

Abstract

The invention relates to the technical field of medical equipment, in particular to an auxiliary traction device for traumatic orthopedic nursing, which comprises a bottom plate, a left swing plate and a right swing plate hinged to the top of the bottom plate, a mounting plate is arranged on the swing plates, a thigh supporting plate is connected to the top of the mounting plate, and a left spline shaft II and a right spline shaft II are rotatably connected to the upper part of the mounting plate; connecting plates are connected to the sides, close to each other, of the two second spline shafts, a shank supporting plate is connected between the two connecting plates, a first motor is installed on the swing plate, rollers are connected to an output shaft of the first motor, and an arc-shaped sliding groove for the rollers to move is formed in the top of the bottom plate; the sides, away from each other, of the two second spline shafts connected to the same mounting plate are connected with first worm wheels through first locking pieces, the mounting plate is rotationally connected with a left first worm and a right first worm, and the first worms are meshed with the first worm wheels on the same side with the first worms. The passive rehabilitation training mode and the active rehabilitation training mode can be switched, so that the requirements of patients in different rehabilitation stages can be better met, and the flexibility and the effect of rehabilitation training are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to an auxiliary traction device for trauma orthopedic nursing. Background Art

[0002] Postoperative leg rehabilitation training can significantly help patients restore their physical strength and improve their physical functions, accelerate the overall recovery process, and shorten the recovery period.

[0003] After searching, a Chinese patent with patent publication number CN114452166A is found, which is an orthopedic nursing traction device, including a periodic assist device, an auxiliary locking device, an abdominal restraint assembly, a manual release assembly, a first leg knee flexion device, a second leg knee flexion device, a hip rehabilitation traction device, a seat and an equipment base.

[0004] Although the above patent can provide patients with leg rehabilitation training, it only supports passive rehabilitation training methods and cannot meet the patient's needs for active training, and its flexibility is limited. It is mainly suitable for patients in the early stages of rehabilitation. At this stage, the patient's mobility is limited and external support is required for exercise. However, once the patient recovers to the point where he or she has the ability to actively train, the above patent cannot meet the patient's rehabilitation needs, making it difficult to achieve the expected rehabilitation training effect. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an auxiliary traction device for trauma orthopedic nursing that can switch between passive and active rehabilitation training modes.

[0006] The lifting mechanism is a kind of inertia of the present invention, and its lifting mechanism is a kind of inertia of the present invention.

[0007] Preferably, the mounting plate is rotatably connected to the swing plate via a spline shaft 1, a worm gear 2 is connected to the spline shaft 1 via a locking piece 2, a motor 3 is mounted on the swing plate, a worm gear 2 is connected to the output shaft of the motor 3, and the worm gear 2 is meshed with the worm gear 2.

[0008] Preferably, the locking member 1 includes a spline sleeve sleeved on the spline shaft 2, a nut is connected to the spline sleeve, a screw is connected to the inner thread of the nut, a threaded hole 2 matching the screw is opened on the spline shaft 2, and the worm gear 1 is connected to the outer wall of the spline sleeve. The structure of the locking member 2 is consistent with the structure of the locking member 1, and a threaded hole 1 matching the screw on the locking member 2 is opened on the spline shaft 1.

[0009] Preferably, hook springs are provided between the swing plate and the thigh support plate, and between the swing plate and the calf support plate, and hanging rings are connected to the swing plate, the thigh support plate and the calf support plate at intervals. Each hook spring is connected to two corresponding hanging rings above and below through the hook thereon.

[0010] Preferably, two hook springs are provided between the two swing plates, and two hanging rings are connected to the top of the base plate and the side where the two swing plates are close to each other. Each hook spring is connected to the two hanging rings on the base plate and the corresponding swing plate through the hooks at its two ends.

[0011] Preferably, an extension mechanism is provided on the calf support plate, and the extension mechanism includes an extension support plate, a movable plate and a screw motor. A guide groove is provided on the calf support plate, and an extension support plate is provided in the guide groove. The lower part of the extension support plate away from the thigh support plate is connected to the movable plate, and a screw motor for driving the movable plate to move back and forth is installed at the bottom of the calf support plate.

[0012] Preferably, an ankle traction mechanism is provided on the side of the extension support plate away from the thigh support plate, and the ankle traction mechanism includes a connecting block connected to the side of the extension support plate away from the thigh support plate, a connecting plate is hinged on the connecting block, a foot rest is connected to the connecting plate, a spiral spring is connected between the connecting plate and the connecting block, an elastic strap 2 is connected to the foot rest, and a buckle 2 is connected to the elastic strap 2.

[0013] Preferably, airbags are connected to the inner walls of the thigh support plate and the calf support plate, and cylinders are connected to the two swinging plates. The cylinders are connected to the airbags on the same side through hoses, and piston rods are slidably connected to the two cylinders. Adjustment screws are rotatably connected to the two swinging plates, and sliding plates are threadedly connected to the two adjustment screws. The two sliding plates are respectively connected to the two piston rods.

[0014] The beneficial effects of the present invention have the following advantages compared with the prior art:

[0015] 1. Through the cooperation of components such as motor 1, roller, worm gear 1, locking piece 1, worm gear 1, motor 2, belt drive assembly, worm gear 2, locking piece 2, motor 3 and worm gear 2, it is possible to guide the patient's legs and hips to perform passive stretching exercises, so that the patient's lower limbs can receive sufficient rehabilitation training; the locking piece 1 releases the lock between the worm gear 1 and the spline shaft 2, and the locking piece 2 releases the lock between the worm gear 2 and the spline shaft 1, so that the patient's legs and hips can be guided to perform active stretching exercises, so that the present invention can switch between passive and active rehabilitation training modes to better adapt to the needs of patients at different rehabilitation stages and improve the flexibility and effect of rehabilitation training.

[0016] 2. Through hook spring one and hook spring two, a certain resistance can be applied during leg rehabilitation training, thereby enhancing the intensity of leg rehabilitation training and improving the effect of leg rehabilitation training; and the number of hook spring one and hook spring two can be flexibly adjusted according to the patient's rehabilitation progress and personal situation to ensure the safety and effectiveness of the rehabilitation process and promote the best rehabilitation effect.

[0017] 3. The screw motor can drive the movable plate to move the extension support plate back and forth, so that it can better adapt to patients with different leg lengths. It can not only improve the comfort and applicability of use, but also provide the best leg support, which helps to enhance the effect of rehabilitation training.

[0018] 4. The setting of the foot rest and spiral spring can assist patients in ankle flexibility and strength training, which helps promote ankle joint recovery.

[0019] 5. By inflating the airbag, the airbag can be expanded to fit tightly against the legs, thereby better adapting to leg shapes of different thicknesses, and furthermore fixing the legs more firmly on the thigh support plate and the calf support plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the installation of components such as the motor 1 and the roller of the present invention.

[0022] Figure 3 This is a schematic diagram of the installation of the thigh support plate, calf support plate and other components of the present invention.

[0023] Figure 4 This is a schematic diagram of the installation of the locking member 1, worm 1 and motor 2 of the present invention.

[0024] Figure 5 This is a schematic diagram of the installation of the locking member 2, motor 3, worm gear 2 and other components of the present invention.

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the locking member 1 of the present invention.

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of the locking member 2 of the present invention.

[0027] Figure 8 It is a schematic diagram of the three-dimensional structure of part of the present invention.

[0028] Figure 9 The figure is a schematic diagram of the installation of the first hanging ring, the first hook spring, the second hanging ring and the second hook spring of the present invention.

[0029] Figure 10 It is a schematic diagram of the three-dimensional structure of the extension mechanism of the present invention.

[0030] Figure 11 It is a schematic diagram of the three-dimensional structure of the ankle pulling mechanism of the present invention.

[0031] Figure 12 This is a schematic diagram of the installation of the airbag, cylinder body, hose and other components of the present invention.

[0032] In the figure: 1-base plate, 01-arc slide, 2-swing plate, 3-spline shaft 1, 03-threaded hole 1, 4-mounting plate, 5-spline shaft 2, 51-threaded hole 2, 7-thigh support plate, 8-connecting plate, 9-calf support plate, 91-guide groove, 10-elastic strap 1, 11-buckle 1, 12-motor 1, 13-roller, 14-worm gear 1, 15-locking piece 1, 151-spline sleeve, 152-nut, 153-screw, 16-worm gear 1, 17-motor 2, 18-belt drive Components, 19-worm gear 2, 20-locking piece 2, 21-motor 3, 22-worm gear 2, 23-hanging ring 1, 24-hook spring 1, 25-hanging ring 2, 26-hook spring 2, 27-extension support plate, 28-movable plate, 29-screw motor, 30-connecting block, 31-connecting plate, 32-foot support, 33-volute spring, 34-elastic strap 2, 35-buckle 2, 36-airbag, 37-cylinder body, 38-hose, 39-piston rod, 40-adjusting screw, 41-sliding plate. DETAILED DESCRIPTION

[0033] See also Figure 1-Figure 5An auxiliary traction device for trauma orthopedic care includes an arc-shaped bottom plate 1, two left and right swing plates 2 are hinged on the top and rear side of the bottom plate 1, the top and rear side of the swing plate 2 are rotatably connected to a spline shaft 3, the spline shaft 3 is connected to a mounting plate 4, the top and rear side of the mounting plate 4 is connected to a thigh support plate 7, the front upper part of the mounting plate 4 is rotatably connected to two left and right spline shafts 5, the two spline shafts 5 are connected to a connecting plate 8 on the side close to each other, and a calf support plate 9 is connected between the two connecting plates 8. The thigh support plate 7 and the calf support plate 9 are arc-shaped. , which can better fit the legs, the left sides of the thigh support plate 7 and the calf support plate 9 are connected with two front and rear elastic straps 10, and the right side of the elastic strap 10 is connected with a buckle 11, the male buckle of the buckle 11 is connected to the right side of the elastic strap 10, the female buckle of the buckle 11 on the thigh support plate 7 is connected to the right side of the thigh support plate 7, and the female buckle of the buckle 11 on the calf support plate 9 is connected to the right side of the calf support plate 9. The buckles are existing technologies and will not be repeated here. A motor 12 is installed on the front side of the swing plate 2, and the output shaft of the motor 12 is connected to There is a roller 13, and two arc-shaped grooves 01 are opened on the front side of the top of the bottom plate 1. The two rollers 13 are respectively located in the two arc-shaped grooves 01, which are used to guide the movement of the roller 13. The two spline shafts 2 5 connected to the same mounting plate 4 are connected to a worm wheel 14 on the side away from each other through a locking piece 15. The front side of the mounting plate 4 is rotatably connected to the left and right worm gears 16. The worm gear 16 is engaged with the worm gear 14 on the same side. The front side of the mounting plate 4 is installed with a motor 2 17 located between the two worm gears 16. The motor The output shaft of motor 17 is connected to worm 16 through belt transmission assembly 18. The belt transmission assembly 18 includes two pulleys and a belt. The two pulleys are respectively connected to the output shafts of worm 16 and motor 2 17. The belt is sleeved between the two pulleys. The two sides of the spline shaft 1 3 away from each other are connected to worm wheel 2 19 through locking piece 20. Motor 3 21 is installed on the rear side of the swing plate 2. Worm 22 is connected to the output shaft of motor 3 21. Worm 22 is engaged with worm wheel 2 19 on the same side as it.

[0034] See also Figure 6-Figure 7 The locking piece 15 includes a spline sleeve 151 that is slidably sleeved on the spline shaft 25, a nut 152 is connected to the middle part of the spline sleeve 151, and a screw 153 is connected to the inner thread of the nut 152. A threaded hole 251 matching the screw 153 is opened on the spline shaft 25, and the worm gear 14 is connected to the outer wall of the spline sleeve 151. The structure of the locking piece 20 is consistent with that of the locking piece 15. The spline sleeve 151 on the locking piece 20 is slidably sleeved on the spline shaft 3, and the worm gear 19 is connected to the outer wall of the spline sleeve 151 on the locking piece 20. A threaded hole 03 matching the screw 153 on the locking piece 20 is opened on the spline shaft 3.

[0035] First, place both legs on the left and right thigh support plates 7 and calf support plates 9, respectively, with the thighs resting on the thigh support plates 7 and the calves resting on the calf support plates 9. Then, insert the male buckle on the buckle 11 into the female buckle and lock it. Thus, through the cooperation of the elastic strap 10 and the buckle 11, the legs are fixed to the thigh support plates 7 and the calf support plates 9. Control the two motors 12 to drive the two rollers 13 to rotate alternately forward and reverse, and to rotate the two rollers 13 in opposite directions, so that the two rollers 13 can move horizontally back and forth along the arc-shaped slide 01, thereby driving the two swing plates 2 to swing back and forth outward and inward, and further driving the patient's legs to open and close, guiding the patient's legs and hips to perform passive stretching exercises, and providing sufficient rehabilitation training for the patient's lower limbs. The control motor 2 17 rotates alternately forward and reverse, thereby driving the worm 16 to rotate alternately forward and reverse through the belt drive assembly 18, thereby driving the worm gear 14 to drive the splined sleeve 151 on the locking member 15 to rotate alternately forward and reverse. The alternate forward and reverse rotation of the splined sleeve 151 on the locking member 15 drives the splined shaft 13, nut 152, and screw 153 to rotate alternately forward and reverse synchronously. The screw 153 on the locking member 15 will not automatically loosen, and the splined sleeve 151 on the locking member 15 is firmly locked to the splined shaft 13. The alternate forward and reverse rotation of the splined shaft 13 drives the calf support plate 9 to swing downward and upward through the connecting plate 8, thereby driving the patient's calf to swing downward and upward, achieving passive knee flexion training for the patient's leg. The control motor 3 21 drives the worm 2 22 to rotate alternately forward and reverse, thereby driving the worm gear 2 19 to drive the splined shaft 13 to rotate alternately forward and reverse through the locking member 2 20, thereby driving the mounting plate 4 to swing up and down, thereby driving the leg to swing up and down. The two motors 3 21 rotate alternately forward and reverse, so that the two mounting plates 4 swing up and down alternately, thereby making the legs swing up and down alternately, thereby guiding the patient's legs to be lifted alternately to simulate natural walking, thereby improving the rehabilitation training effect.

[0036] When the patient has recovered the ability to actively train, the screw 153 on the locking member 15 is rotated to remove it from the threaded hole 251 on the spline shaft 2 5, thereby releasing the lock between the spline shaft 2 5 and the spline sleeve 151 on the locking member 15. Subsequently, the spline sleeve 151 on the locking member 15 can be removed from the spline shaft 2 5, thereby disengaging the worm gear 14 from the worm 16. Similarly, the screw 153 on the locking member 20 is rotated to remove it from the threaded hole 103 on the spline shaft 3, thereby releasing the lock between the spline shaft 3 and the spline sleeve 151 on the locking member 20. Subsequently, the spline sleeve 151 on the locking member 20 can be removed from the spline shaft 3, thereby disengaging the worm gear 19 from the worm 2 22. In this way, the lock of spline shaft 1 3 and spline shaft 2 5 can be released, and then active leg rehabilitation training can be carried out. In this way, the device can switch between passive and active rehabilitation training modes to better adapt to the needs of patients at different rehabilitation stages and improve the flexibility and effect of rehabilitation training.

[0037] See also Figure 8-Figure 9 , hook springs 24 are arranged at intervals between the swing plate 2 and the thigh support plate 7, as well as between the swing plate 2 and the calf support plate 9, and hanging rings 23 are connected at intervals on the swing plate 2, the thigh support plate 7 and the calf support plate 9. Each hook spring 24 is connected to the two corresponding hanging rings 23 above and below through the hooks thereon. Hook springs 26 are arranged at intervals between the two swing plates 2, and hanging rings 25 are connected at intervals on the top of the base plate 1 and the side where the two swing plates 2 are close to each other. Each hook spring 26 is connected to the hanging rings 25 on the base plate 1 and the corresponding swing plate 2 through the hooks at both ends.

[0038] By means of the hook spring 1 24, a certain resistance can be applied during the upward swinging of the legs, thereby increasing the intensity of the leg rehabilitation training and improving the effect of the leg rehabilitation training. By means of the hook spring 1 24 between the calf support plate 9 and the base plate 1, a certain resistance can be applied during the knee flexion training, thereby increasing the intensity of the leg rehabilitation training and improving the effect of the leg rehabilitation training. By means of the hook spring 2 26, a certain resistance can be applied during the stretching exercise of the legs and hips when the legs are opened outward, thereby increasing the intensity of the leg rehabilitation training and improving the effect of the leg rehabilitation training. The number of the hook spring 1 24 and the hook spring 2 26 can be flexibly adjusted according to the patient's rehabilitation progress and personal situation to ensure the safety and effectiveness of the rehabilitation process and promote the best rehabilitation effect.

[0039] See also Figure 10-11The calf support plate 9 is provided with an extension mechanism, which includes an extension support plate 27, a movable plate 28 and a screw motor 29. An arc-shaped guide groove 91 is opened on the calf support plate 9, and an arc-shaped extension support plate 27 is slidingly provided in the guide groove 91. The lower front part of the extension support plate 27 is connected with an L-shaped movable plate 28. The L-shaped movable plate 28 is located on the lower side of the calf support plate 9. A screw motor 29 is installed at the bottom of the calf support plate 9. The screw on the screw motor 29 is threadedly connected to the L-shaped movable plate 28 to drive the L-shaped movable plate 28 to move back and forth.

[0040] By controlling the rotation of the screw motor 29, the movable plate 28 can be driven to drive the extended support plate 27 to move forward, so as to better adapt to patients with different leg lengths. It can not only improve the comfort and applicability of use, but also provide optimal leg support, which helps to enhance the effect of rehabilitation training.

[0041] See also Figure 11 An ankle traction mechanism is provided on the front side of the extended support plate 27, and the ankle traction mechanism includes two left and right connecting blocks 30 connected to the front side of the extended support plate 27, a connecting plate 31 is hinged between the two connecting blocks 30, a connecting plate 31 is hinged on the connecting block 30, a foot rest 32 is connected to the connecting plate 31, a spiral spring 33 is connected between the connecting plate 31 and the connecting block 30, and two front and rear elastic straps 34 are connected to the left side of the foot rest 32, and a buckle 2 35 is connected to the right side of the elastic strap 2 34, the male buckle of the buckle 2 35 is connected to the right side of the elastic strap 2 34, and the female buckle of the buckle 2 35 is connected to the right side of the foot rest 32.

[0042] Place the foot on the footrest 32 and insert the male buckle on the second buckle 35 into the female buckle to lock it. The foot can be fixed on the footrest 32 through the cooperation of the second elastic strap 34 and the second buckle 35. Pushing the footrest 32 to swing up and down with the foot can train the flexibility and strength of the ankle, which helps to promote the rehabilitation of the ankle joint. The spiral spring 33 can apply a certain resistance during the ankle rehabilitation training, thereby enhancing the intensity of the ankle rehabilitation training and improving the effect of the ankle rehabilitation training.

[0043] See also Figure 12 The inner walls of the thigh support plate 7 and the calf support plate 9 are connected to air bags 36, and the rear parts of the two swing plates 2 are connected to cylinders 37. The cylinders 37 are connected to the air bags 36 on the same side through hoses 38. The two cylinders 37 are slidably connected to piston rods 39, and the rear parts of the two swing plates 2 are rotatably connected to adjusting screws 40. The two adjusting screws 40 are threadedly connected to sliding plates 41, and the two sliding plates 41 are respectively connected to the two piston rods 39.

[0044] Rotating the adjustment screw 40 drives the sliding plate 41 backward, thereby driving the piston rod 39 backward, injecting the gas in the cylinder 37 into the airbag 36 through the hose 38. The airbag 36 inflates and fits tightly against the leg, thus better adapting to the shape of legs of different sizes and more firmly fixing the leg to the thigh support plate 7 and calf support plate 9. Reversing the adjustment screw 40 causes the sliding plate 41 to drive the piston rod 39 forward, pumping the gas in the airbag 36 back into the cylinder 37 through the hose 38, and the airbag 36 then deflates.

Claims

1. An auxiliary traction device for trauma orthopedic nursing, comprising a base plate (1), two left and right swing plates (2) hinged on the top of the base plate (1), a mounting plate (4) on the swing plate (2), a thigh support plate (7) connected to the top of the mounting plate (4), a left and right spline shaft (5) rotatably connected to the upper part of the mounting plate (4), a connecting plate (8) connected to the sides of the two spline shafts (5) close to each other, a calf support plate (9) connected between the two connecting plates (8), an elastic band (10) connected to the thigh support plate (7) and the calf support plate (9), a buckle (11) connected to the elastic band (10), and characterized in that: A motor (12) is mounted on the swing plate (2), a roller (13) is connected to the output shaft of the motor (12), an arc-shaped slide groove (01) is opened on the top of the bottom plate (1) for the roller (13) to move, two spline shafts (5) connected to the same mounting plate (4) are connected to a worm gear (14) on the side away from each other through a locking member (15), and the mounting plate (4) is rotatably connected to two left and right worm gears (16), the worm gear (16) and the worm gear (14) on the same side thereof are engaged, and a motor (17) is mounted on the mounting plate (4), and the output shaft of the motor (17) is connected to the worm gear (16) through a belt transmission assembly (18).

2. The auxiliary traction device for trauma orthopedic care according to claim 1, characterized in that: The mounting plate (4) is rotatably connected to the swing plate (2) via a spline shaft (3). The spline shaft (3) is connected to a worm gear (19) via a locking member (20). A motor (21) is mounted on the swing plate (2). The output shaft of the motor (21) is connected to a worm gear (22). The worm gear (22) is meshed with the worm gear (19).

3. The auxiliary traction device for trauma orthopedic care according to claim 2, characterized in that: The locking member 1 (15) comprises a spline sleeve (151) sleeved on the spline shaft 2 (5), a nut (152) is connected to the spline sleeve (151), a screw rod (153) is connected to the internal thread of the nut (152), a threaded hole 2 (51) matching the screw rod (153) is opened on the spline shaft 2 (5), a worm gear 1 (14) is connected to the outer wall of the spline sleeve (151), the structure of the locking member 2 (20) is consistent with the structure of the locking member 1 (15), and a threaded hole 1 (03) matching the screw rod (153) on the locking member 2 (20) is opened on the spline shaft 1 (3).

4. The auxiliary traction device for trauma orthopedic care according to claim 3, characterized in that: Hook springs (24) are provided between the swing plate (2) and the thigh support plate (7) and between the swing plate (2) and the calf support plate (9). Hanging rings (23) are connected to the swing plate (2), the thigh support plate (7) and the calf support plate (9) at intervals. Each hook spring (24) is connected to two corresponding hanging rings (23) above and below through the hook on it.

5. The auxiliary traction device for trauma orthopedic care according to claim 4, characterized in that: Two hook springs (26) are provided between the two swing plates (2), and two hanging rings (25) are connected to the top of the bottom plate (1) and the sides of the two swing plates (2) close to each other. Each hook spring (26) is connected to the bottom plate (1) and the hanging ring (25) on the corresponding swing plate (2) through hooks at both ends.

6. The auxiliary traction device for trauma orthopedic care according to claim 5, characterized in that: The calf support plate (9) is provided with an extension mechanism, which includes an extension support plate (27), a movable plate (28) and a screw motor (29). A guide groove (91) is provided on the calf support plate (9), and an extension support plate (27) is provided in the guide groove (91). The lower part of the extension support plate (27) away from the thigh support plate (7) is connected to the movable plate (28). The bottom of the calf support plate (9) is installed with a screw motor (29) for driving the movable plate (28) to move back and forth.

7. The auxiliary traction device for trauma orthopedic care according to claim 6, characterized in that: An ankle pulling mechanism is provided on the side of the extension support plate (27) away from the thigh support plate (7), and the ankle pulling mechanism comprises a connecting block (30) connected to the side of the extension support plate (27) away from the thigh support plate (7), a connecting plate (31) is hinged on the connecting block (30), a footrest (32) is connected to the connecting plate (31), a volute spring (33) is connected between the connecting plate (31) and the connecting block (30), an elastic strap (34) is connected to the footrest (32), and a buckle (35) is connected to the elastic strap (34).

8. The auxiliary traction device for trauma orthopedic care according to claim 7, characterized in that: The inner walls of the thigh support plate (7) and the calf support plate (9) are both connected to air bags (36), the two swing plates (2) are both connected to cylinders (37), the cylinders (37) are communicated with the air bags (36) on the same side thereof through hoses (38), the two cylinders (37) are both slidably connected to piston rods (39), the two swing plates (2) are both rotatably connected to adjusting screw rods (40), the two adjusting screw rods (40) are both threadedly connected to sliding plates (41), and the two sliding plates (41) are respectively connected to the two piston rods (39).

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