Lying position head and neck muscle strength training device

Abstract

The invention provides a clinostatic head and neck muscle strength training device. The clinostatic head and neck muscle strength training device comprises a training bed, the supporting mechanism is arranged outside the bedside end of the bed board; the head and neck training mechanism is arranged at the upper end of the supporting mechanism and comprises a helmet and a fixing belt, and the end, away from the bed board, of the helmet is connected with the supporting mechanism through a universal ball joint; the four-limb exercising mechanism comprises handles arranged on the two sides of the upper surface of the bed board in a sliding mode and two pedal plates arranged on the upper surface of the tail end of the bed board in a sliding mode respectively, the handles and the pedal plates are connected with the outer edge of the helmet through pull ropes, and the pull ropes are connected with four different positions on the outer circumference of the helmet respectively. The head of a person can be driven to do actions such as head raising, head lowering and lateral bending through four-limb exercise, so that neck muscle exercise is achieved, and the device is suitable for exercise of patients or sub-healthy people in all stages and particularly suitable for patients needing to do clinostatism exercise in the initial training recovery stage; the device has the advantages of whole-body exercise, blood circulation promotion, recovery acceleration, high interestingness, easy persistence of patients and good training effect.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a supine head and neck muscle training device. Background Art

[0002] Cervical spondylosis disease (CSD) refers to a syndrome of cervical intervertebral disc degeneration (CIDD) and a series of secondary pathological changes, which in turn cause compression of nerve roots and spinal cord, resulting in corresponding clinical manifestations. Cervical spondylosis is mainly manifested clinically as chronic pain in the neck, neck, shoulder and back (pain duration usually exceeds 3 months), corresponding to numbness and weakness of the forearm and fingers on the same side, stiffness of the neck and shoulder, limited movement, muscle spasm, etc.

[0003] For many patients with cervical spondylosis or people who work at a desk for a long time and suffer from neck pain, neck muscle training can enhance neck muscle strength, relieve neck muscle spasms, and increase the neck muscle pain threshold, thereby correcting the cervical curvature and relieving neck and shoulder pain. It is an effective non-surgical treatment for cervical spondylosis.

[0004] However, in the prior art, there is a lack of auxiliary equipment for head and neck muscle rehabilitation training in a prone position, and in the early stage of training recovery, training needs to be performed in a lying position, so special auxiliary equipment for supine shoulder and neck muscle rehabilitation training is needed.

[0005] In summary, there is an urgent need to design a supine head and neck muscle training device that overcomes the above-mentioned problems. Summary of the invention

[0006] The purpose of the present invention is to provide a supine head and neck muscle training device which overcomes the above problems.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: a supine head and neck muscle strength training device, comprising:

[0008] A training bed, comprising a bed board and support frames arranged on both sides of the lower end of the bed board;

[0009] A supporting mechanism, which is arranged on the outer side of one end of the bed head of the bed board;

[0010] A head and neck training mechanism, which is arranged at the upper end of the support mechanism, and includes a helmet and fixing straps respectively arranged on both sides of the opening end of the helmet, the opening end of the helmet faces the bed board, and one end of the helmet away from the bed board is movably connected to the support mechanism through a spherical universal joint;

[0011] The limbs exercise mechanism includes handles slidably arranged on both sides of the upper surface of the bed board and two footrests slidably arranged on the upper surface of the tail end of the bed board, the handles and the footrests are respectively connected to the outer edge of the helmet through pull ropes, and the four pull ropes respectively pass through the inside of the bed board and the supporting mechanism, and are connected to four different positions on the same outer circumference of the helmet.

[0012] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0013] Furthermore, the support mechanism includes a shaped frame fixedly connected to the bed board and a column fixed in the middle of the upper end of the cross bar of the shaped frame, and the spherical seat of the spherical universal joint is fixed to the upper end of the column close to the side of the helmet;

[0014] A spring is sleeved on the outer side of the spherical universal joint, and two ends of the spring are fixedly connected to the column and the helmet respectively.

[0015] Furthermore, the handle is slidably disposed at the upper end of the first slide groove through a first slider, and a first return spring is fixedly connected between an end of the first slider close to the end of the bed and a side wall of the first slide groove;

[0016] The footrest is slidably arranged at the upper end of the second slide slot through a second slider, and a second return spring is fixedly connected between one end of the second slider close to the end of the bed and the side wall of the second slide slot.

[0017] Furthermore, one end of the four pull ropes is fixedly connected to the first slider and the second slider respectively, and the other end of the four pull ropes is connected to the outer edge of the helmet.

[0018] Furthermore, the outer edge of the helmet is integrally connected to a circular ring, at least four clasps are evenly arranged on the circular ring, and the outer end of the draw cord is provided with a buckle matching the clasp.

[0019] Furthermore, a training direction adjustment mechanism is provided on the outer wall of the helmet.

[0020] Furthermore, the training direction adjustment mechanism includes an annular slide groove opened on the outer wall of the helmet, at least two fourth sliders are arranged in the annular slide groove, a buckle is provided at the upper end of the fourth slider, an annular slide hole communicating with the annular slide groove is opened on the rear side wall of the annular slide groove, and a fixing bolt threadedly connected to the fourth slider is passed through the outer side of the annular slide hole.

[0021] Furthermore, a bowl-shaped air bag is attached to the inner wall of the helmet, and the air bag is connected to the inflated air ball through an inflation tube.

[0022] Furthermore, the bed board is also provided with a neck and shoulder massage mechanism;

[0023] The neck and shoulder massage mechanism includes two grooves formed on the upper surface of the head end of the bed board, mounting shafts respectively slidably arranged in the grooves, and massage rollers rotatably arranged in the middle of the outer walls of the mounting shafts. Both sides of the mounting shafts are slidably arranged in third chutes formed on both sides of the grooves. Both sides of the mounting shafts are fixedly connected to one end of a secondary pulling rope through a U-shaped frame. The other end of the secondary pulling rope is fixedly connected to the lower end of the handle on the same side. Both ends of the side of the mounting shaft close to the secondary pulling rope are respectively fixedly connected to the side walls of the third chutes through third return springs.

[0024] Further, the neck support includes a support and a soft pad arranged at the upper end of the support. A screw rod is rotatably connected between the cross bar of the U-shaped frame and the bed board. The support is threadedly connected to the screw rod. A fourth chute is formed on the inner wall of the vertical rod of the U-shaped frame. Both ends of the support are slidably arranged in the fourth chute. A knob is arranged on the outer wall of one end of the screw rod close to the cross bar of the U-shaped frame.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. For the lying position head and neck muscle strength training device of the present invention, by arranging a support mechanism at the head end of the bed board and a head and neck training mechanism at the upper end of the support mechanism, a person lies on the bed board, wears the helmet of the head and neck training mechanism on the head, and fixes the helmet with a fixing belt. Driven by the four-limb exercise mechanism and the pulling rope, the person's head makes movements such as raising, lowering, and bending sideways, so as to realize the exercise of neck muscles, which is suitable for patients in various stages of cervical spondylosis or sub-healthy people to exercise, especially suitable for patients who need to adopt lying position exercise in the initial stage of training and recovery.

[0027] 2. For the support of the lying position head and neck muscle strength training device of the present invention, by connecting the four-limb exercise mechanism to four different positions on the ring on the outer wall of the helmet through the pulling rope, the exercise of the patient's neck can be driven by the exercise of the patient's own arms and legs, which can not only exercise the head and neck muscle strength, but also enable the patient's limbs to be exercised, realizing full-body exercise, promoting blood circulation, accelerating the patient's recovery, and at the same time, having interestingness, being easy for the patient to adhere to, and having good training effects.

[0028] 3. For the lying position head and neck muscle strength training device of the present invention, by arranging a training direction adjustment structure on the outer wall of the helmet, the patient's head can make rotational raising and lowering movements at different angles, enabling the neck muscles to be more fully trained and accelerating the rehabilitation effect.

[0029] 4. The supine head and neck muscle training device of the present invention is provided with a neck and shoulder massage structure, and the handle is connected to the neck and shoulder massage mechanism through an auxiliary pull rope. When the handle slides back and forth to drive the pull rope and the helmet to exercise the neck, it can also drive the auxiliary pull rope and the massage roller to slide back and forth at the same time, thereby massaging the neck and shoulder muscles, relaxing the neck and shoulder muscles, effectively relieving the stiffness of the patient's neck and shoulders, and contributing to neck rehabilitation.

[0030] 5. The supine head and neck muscle training device of the present invention can support the patient's neck during training by providing a neck support, thereby preventing the cervical spine from being subjected to too much pressure, thereby helping to protect the patient's cervical spine and preventing it from suffering secondary injury or worsening of the condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the supine head and neck muscle training device provided by the present invention;

[0032] Figure 2 is a schematic cross-sectional top view of a bed board according to an embodiment of the present invention;

[0033] Figure 3 is a side cross-sectional schematic diagram of the connection between the helmet and the column in an embodiment of the present invention;

[0034] Figure 4 yes Figure 2 The enlarged schematic diagram of point A in the middle;

[0035] Figure 5 is a cross-sectional schematic diagram of a neck support in an embodiment of the present invention;

[0036] Description of reference numerals:

[0037] 1. training bed; 11. bed board; 12. support frame; 13. first slide groove; 14. second slide groove; 15. groove; 151. third slide groove; 16. first cavity;

[0038] 2. Support mechanism; 21. Profile frame; 211. Second cavity; 22. Column; 23. Spring;

[0039] 3. Head and neck training mechanism; 31. Helmet; 311. Ring; 312. Clasp; 313. Airbag; 314. Inflatable tube; 315. Inflatable tube; 32. Fixing belt;

[0040] 4. Ball joint;

[0041] 5. Limb exercise mechanism; 51. Handlebar; 52. Footrest; 53. Pull rope; 54. First slider; 55. First return spring; 56. Second slider; 57. Second return spring; 58. Guide pulley;

[0042] 6. Training direction adjustment mechanism; 61. Annular slide groove; 62. Fourth slide block; 63. Buckle ring; 64. Annular slide hole; 65. Fixing bolt;

[0043] 7. Neck and shoulder massage mechanism; 71. Mounting shaft; 72. Massage roller; 73. U-shaped frame; 74. Auxiliary pull rope; 75. Third return spring;

[0044] 8. Neck support; 81. Support; 82. Cushion; 83. Screw; 84. Fourth slide slot; 85. Knob. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0046] See also Figures 1 to 5 , a supine head and neck muscle training device, comprising a training bed 1, which comprises a bed board 11 and support frames 12 arranged on both sides of the lower end of the bed board 11;

[0047] A support mechanism 2, which is arranged on the outer side of one end of the bedside of the bed board 11;

[0048] A head and neck training mechanism 3 is arranged at the upper end of the support mechanism 2, and comprises a helmet 31 and fixing straps 32 respectively arranged at both sides of the opening end of the helmet 31, the opening end of the helmet 31 faces the bed board 11, and the end of the helmet 31 away from the bed board 11 is movably connected to the support mechanism 2 through a spherical universal joint 4;

[0049] The limb exercise mechanism 5 includes handles 51 slidably arranged on both sides of the upper surface of the bed board 11 and two footrests 52 slidably arranged on the upper surface of the tail end of the bed board 11, the handles 51 and the footrests 52 are respectively connected to the outer edge of the helmet 31 through pull ropes 53, and the four pull ropes 53 respectively pass through the inside of the bed board 11 and the supporting mechanism 2, and are connected to four different positions on the same outer circumference of the helmet 31.

[0050] like Figure 1As shown, in the present invention, preferably four pull ropes 53 are respectively connected to the upper and lower and left and right positions of the helmet 31, so that the helmet 31 can drive the patient's head to do the action of raising the head, lowering the head, and bending to the left and right sides, so as to achieve the purpose of exercising the muscles at different positions of the neck. It should be pointed out that the pull ropes 53 connected to the two handles 51 are respectively connected to the left and right sides or the upper and lower ends of the helmet 31, which is convenient for the patient to operate. When in use, the patient lies on his back, puts the head into the helmet 31, and connects the two fixing belts 32 to each other under the chin to prevent the head from slipping out of the helmet 31 during training. After fixing, the patient then holds the handles 51 with both hands and slides back and forth alternately to make the head raise the head, lower the head, or bend to the left and right sides; after the arm-driven exercise, the patient can also use the feet to alternately step on the pedals 52 to achieve the head bending to the left and right sides or raising the head and lowering the head. It should be pointed out that the training driven by the handles 51 and the training driven by the pedals 52 need to be carried out separately, so that the head can do a single action to avoid injury.

[0051] Preferably, the support mechanism 2 includes a shaped frame 21 fixedly connected to the bed board 11 and a column 22 fixed to the middle of the upper end of the cross bar of the shaped frame 21, and the spherical seat of the spherical universal joint 4 is fixed to the upper end of the column 22 near the side of the helmet 31; Figure 1 As shown, the profile frame 21 is horizontally arranged at one end of the bedside of the bed board 11;

[0052] like Figure 1 and Figure 3 As shown, a spring 23 is sleeved on the outer side of the spherical universal joint 4, and the two ends of the spring 23 are respectively fixedly connected to the column 22 and the helmet 31. The spring 23 can promote the return of the pull rope 53 on the one hand, and on the other hand, it can also limit the arbitrary rotation of the spherical universal joint 4, which can avoid patient injury to a certain extent.

[0053] Preferably, if Figure 1 and Figure 2 As shown, the handle 51 is slidably disposed at the upper end of the first slide groove 13 through a first slider 54, and a first return spring 55 is fixedly connected between an end of the first slider 54 close to the end of the bed and a side wall of the first slide groove 13;

[0054] The footrest plate 52 is slidably disposed at the upper end of the second slide groove 14 via a second slider 56 , and a second return spring 57 is fixedly connected between an end of the second slider 56 close to the end of the bed and a side wall of the second slide groove 14 .

[0055] In this embodiment, the first return spring 55 and the second return spring 57 can return the handlebar 51 and the pedal 52 to their original positions, so that the pull rope 53 can always be in a taut state, so as to achieve the purpose of effectively training the neck.

[0056] Preferably, one end of the four pull ropes 53 is fixedly connected to the first slider 54 and the second slider 56 respectively, and the other end of the four pull ropes 53 is connected to the outer edge of the helmet 31. Figure 2 As shown, the pull rope 53 passes through the second cavity 211 in the cam frame 21 and the first cavity 16 in the bed board 11 respectively. The second cavity 211 is connected to the first cavity 16. In the entire two cavities, guide pulleys 58 are provided at the corners to change the direction of the pull rope 53.

[0057] Preferably, the outer edge of the helmet 31 is integrally connected to the circular ring 311, and at least four snap rings 312 are evenly arranged on the circular ring 311, and at least four snap rings 312 are respectively arranged at the upper and lower ends and the left and right sides of the circular ring 311. The outer end of the pull rope 53 is provided with a buckle matching the snap ring 312, which is convenient for changing the connection position of the pull rope 53 and the helmet 31, so that the patient can do neck exercises in more directions.

[0058] Preferably, if Figure 1 and Figure 3 As shown, a training direction adjustment mechanism 6 is also provided on the outer wall of the helmet 31. By providing the training direction adjustment mechanism 6, the patient can be driven by the pull rope 53 to perform rotation and head-up or rotation and head-down movements, thereby increasing the training methods, allowing the neck muscles to be more fully trained and accelerating the rehabilitation effect.

[0059] Preferably, the training direction adjustment mechanism 6 includes an annular slide groove 61 opened on the outer wall of the helmet 31, at least two fourth sliders 62 are arranged in the annular slide groove 61, a buckle 63 is arranged on the upper end of the fourth slider 62, and an annular slide hole 64 communicating with the annular slide groove 61 is opened on the rear side wall of the annular slide groove 61, and a fixing bolt 65 threadedly connected to the fourth slider 62 is passed through the outer side of the annular slide hole 64.

[0060] In this embodiment, by loosening the fixing bolt 65, the fourth slider 62 can slide in the annular groove 61 until the buckle 63 slides to the appropriate position, and then the fixing bolt 65 is retightened to fix the fourth slider 62 again, and then the pull rope 53 is placed in the buckle 63. The above-mentioned appropriate position generally means that the buckle 63 is not on the same straight line as the pull rope 53, that is, after the middle of the pull rope 53 is placed in the buckle 63, the pull rope 53 is in a triangular state. In this state, when the pull rope 53 is pulled, it can drive the helmet 31 to rotate and lift or lower the head, thereby realizing a variety of neck training methods and improving the training effect.

[0061] Preferably, a bowl-shaped airbag 313 is also attached to the inner wall of the helmet 31, and the airbag 313 is connected to an inflatable air ball 315 through an inflatable tube 314. Inflating air into the airbag 313 can make the helmet 31 fit the patient's head more closely, effectively preventing the head from slipping during training.

[0062] Preferably, the bed board 11 is also provided with a neck and shoulder massage mechanism 7;

[0063] like Figure 2 and Figure 4 As shown, the neck and shoulder massage mechanism 7 includes two grooves 15 opened on the upper surface of the head end of the bed board 11, installation shafts 71 slidably arranged in the grooves 15, and massage rollers 72 rotatably arranged in the middle of the outer wall of the installation shaft 71, and the two sides of the installation shaft 71 are slidably arranged in the third slide groove 151 opened on both sides of the groove 15, and the two sides of the installation shaft 71 are fixedly connected to one end of the auxiliary pull rope 74 through a U-shaped frame 73, and the other end of the auxiliary pull rope 74 is fixedly connected to the lower end of the handle 51 on the same side, and the two ends of the installation shaft 71 on the side close to the auxiliary pull rope 74 are fixedly connected to the side walls of the third slide groove 151 through a third reset spring 75.

[0064] In this embodiment, the handle 51 is slid back and forth alternately with both hands, which can drive the U-shaped frame 73 and the mounting shaft 71 to slide back and forth in the third slide groove 151 through the auxiliary pull rope 74, so that the massage roller 72 against the lower end of the shoulder and neck of the person slides and rolls back and forth, thereby massaging the neck and shoulder muscles, relaxing the neck and shoulder muscles, effectively relieving the stiffness of the patient's neck and shoulders, and contributing to the recovery of the neck.

[0065] Preferably, a neck support 8 is slidably provided between the helmet 31 and the bed board 11, so that the patient's neck can be supported during training to prevent the cervical spine from being subjected to too much pressure;

[0066] like Figure 5 As shown, the neck support 8 includes a support 81 and a cushion 82 arranged at the upper end of the support 81, a screw 83 is rotatably connected between the cross bar of the bend frame 21 and the bed board 11, the support 81 is connected to the screw 83 by a thread, and a fourth slide groove 84 is opened on the inner wall of the vertical rod of the bend frame 21, and both ends of the support 81 are slidably arranged in the fourth slide groove 84, and a knob 85 is provided on the outer wall of one end of the screw 83 close to the cross bar of the bend frame 21.

[0067] In this embodiment, the screw rod 83 can be rotated by rotating the knob 85, thereby driving the support 81 to move back and forth along the screw rod 83. The fourth slide groove 84 limits the rotation of the support 81 so that it can only slide back and forth along the screw rod 83, thereby adjusting the front and rear positions of the support 81 and the cushion 82, so that the position of the neck support 8 meets the patient's needs, the neck is effectively supported, and the patient's comfort during training is improved.

[0068] The present invention is further described above in conjunction with the embodiments, but the present invention is not limited to the above-mentioned implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A supine head and neck muscle training device, characterized in that: include: A training bed (1) comprises a bed board (11) and support frames (12) arranged on both sides of the lower end of the bed board (11); A supporting mechanism (2) arranged on the outer side of one end of the bed head of the bed board (11); A head and neck training mechanism (3) is arranged at the upper end of the support mechanism (2), the head and neck training mechanism (3) comprising a helmet (31) and fixing straps (32) respectively arranged on both sides of an opening end of the helmet (31), the opening end of the helmet (31) faces the bed board (11), and an end of the helmet (31) away from the bed board (11) is movably connected to the support mechanism (2) via a spherical universal joint (4); The limb exercise mechanism (5) comprises handles (51) slidably arranged on both sides of the upper surface of the bed board (11) and two footrests (52) slidably arranged on the upper surface of the tail end of the bed board (11), the handles (51) and the footrests (52) are respectively connected to the outer edge of the helmet (31) through pull ropes (53), and the four pull ropes (53) respectively pass through the inside of the bed board (11) and the supporting mechanism (2) and are connected to four different positions on the same outer circumference of the helmet (31).

2. The supine head and neck muscle training device according to claim 1, characterized in that: The support mechanism (2) comprises a shaped frame (21) fixedly connected to the bed board (11) and a column (22) fixed in the middle of the upper end of the crossbar of the shaped frame (21), and the spherical seat of the spherical universal joint (4) is fixed on the upper end of the column (22) close to the side of the helmet (31); A spring (23) is sleeved on the outer side of the spherical universal joint (4), and two ends of the spring (23) are fixedly connected to the column (22) and the helmet (31) respectively.

3. The supine head and neck muscle training device according to claim 1, characterized in that: The handle (51) is slidably disposed at the upper end of the first slide groove (13) via a first slider (54); a first return spring (55) is fixedly connected between an end of the first slider (54) close to the end of the bed and a side wall of the first slide groove (13); The footrest plate (52) is slidably arranged at the upper end of the second slide groove (14) via a second slider (56); a second return spring (57) is fixedly connected between an end of the second slider (56) close to the end of the bed and a side wall of the second slide groove (14).

4. The supine head and neck muscle training device according to claim 3, characterized in that: One end of the four pull ropes (53) is fixedly connected to the first slider (54) and the second slider (56) respectively, and the other end of the four pull ropes (53) is connected to the outer edge of the helmet (31).

5. The supine head and neck muscle training device according to claim 1, characterized in that: The outer edge of the helmet (31) is integrally connected to a circular ring (311), and at least four clasps (312) are evenly arranged on the circular ring (311), and the outer end of the drawstring (53) is provided with a buckle matching the clasp (312).

6. The supine head and neck muscle training device according to claim 1, characterized in that: A training direction adjustment mechanism (6) is also provided on the outer wall of the helmet (31).

7. The supine head and neck muscle training device according to claim 6, characterized in that: The training direction adjustment mechanism (6) comprises an annular slide groove (61) provided on the outer wall of the helmet (31), at least two fourth sliders (62) are arranged in the annular slide groove (61), a buckle ring (63) is arranged at the upper end of the fourth slider (62), an annular slide hole (64) communicating with the annular slide groove (61) is arranged on the rear side wall of the annular slide groove (61), and a fixing bolt (65) threadedly connected to the fourth slider (62) is passed through the outer side of the annular slide hole (64).

8. The supine head and neck muscle training device according to claim 1, characterized in that: A bowl-shaped air bag (313) is also attached to the inner wall of the helmet (31), and the air bag (313) is connected to an inflatable air ball (315) through an inflating tube (314).

9. The supine head and neck muscle training device according to claim 1, characterized in that: The bed board (11) is also provided with a neck and shoulder massage mechanism (7); The neck and shoulder massage mechanism (7) comprises two grooves (15) provided on the upper surface of the head end of the bed board (11), a mounting shaft (71) slidably provided in the grooves (15) and a massage roller (72) rotatably provided in the middle of the outer wall of the mounting shaft (71), the two sides of the mounting shaft (71) are slidably provided in a third slide groove (151) provided on the two sides of the groove (15), the two sides of the mounting shaft (71) are fixedly connected to one end of the auxiliary pull rope (74) through a U-shaped frame (73), the other end of the auxiliary pull rope (74) is fixedly connected to the lower end of the handle (51) on the same side, and the two ends of the mounting shaft (71) on the side close to the auxiliary pull rope (74) are fixedly connected to the side wall of the third slide groove (151) through a third return spring (75).

10. The supine head and neck muscle training device according to claim 2, characterized in that: A neck support (8) is slidably provided between the helmet (31) and the bed board (11); The neck support (8) comprises a support (81) and a cushion (82) arranged at the upper end of the support (81); a screw rod (83) is rotatably connected between the cross bar of the bend frame (21) and the bed board (11); the support (81) is connected to the screw rod (83) by means of a thread; a fourth slide groove (84) is provided on the inner wall of the vertical rod of the bend frame (21); both ends of the support (81) are slidably arranged in the fourth slide groove (84); and a knob (85) is provided on the outer wall of one end of the screw rod (83) close to the cross bar of the bend frame (21).

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