Leg muscle rehabilitation exercise device

Abstract

The invention provides a leg muscle rehabilitation exercise device, and relates to the field of rehabilitation exercise, the leg muscle rehabilitation exercise device comprises a support base, and a back support is hinged to the outer side of the rear end face of the support base; the angle adjusting mechanism is arranged between the connecting fulcrum shaft and the supporting base; the two resistance-increasing transmission shafts are rotationally connected to the left side and the right side of the inner end of the supporting base correspondingly. The exercise assisting mechanism is arranged between the supporting base and the resistance increasing transmission shaft; the load adjusting mechanism is arranged between the resistance increasing transmission shaft and the supporting base. The two audible and visual alarms are fixedly connected to the outer side end faces of the two connecting supporting plates correspondingly. And the monitoring auxiliary mechanism is arranged between the acousto-optic alarm and the resistance-increasing transmission shaft. According to the leg muscle exercising device, the patient is warned when the pushing speed of the patient to the load support is too high, the recovery progress of the patient is guaranteed, meanwhile, the using effect and using safety of the leg muscle exercising device in the actual application process are improved, and the problem that when the patient treads the support at the too high speed, the legs of the patient are prone to strain or injury is solved.

Description

Technical Field

[0001] The invention relates to the technical field of rehabilitation training, and in particular to a leg muscle rehabilitation training device. Background Art

[0002] In the process of helping neurology patients recover and improve their leg muscle and nerve functions, leg muscle rehabilitation training devices are often used. During use, patients step on the bracket to achieve stretching exercises for the leg nerves and muscles.

[0003] For example, the existing application number CN202010092333.7 relates to a sitting and lying lower limb exercise rehabilitation device, including a base plate, a seat, an exercise device and an auxiliary device, wherein a seat is installed on the upper end of the base plate, an exercise device is arranged under the seat, the exercise device is installed on the base plate, and an auxiliary device is symmetrically installed on the upper end of the seat. The present invention can solve the problems that the existing equipment cannot realize the function of massaging the user's legs while performing leg exercises on the user's legs, and as the user's exercise time increases, the leg muscles are prone to tightening, thereby reducing the efficiency of the equipment in performing rehabilitation exercises on the user's legs. At the same time, it cannot realize the user's leg rehabilitation exercises in a sitting and lying position, and the user's exercise time is prone to increase, the leg force time increases, resulting in a leg load transition, thereby reducing the safety of the user's leg rehabilitation exercises and reducing the effect of the rehabilitation exercises.

[0004] However, when neurology patients use rehabilitation training devices to exercise their leg muscles, they mostly exercise their muscles through the voluntary force of their legs. When the patients step on the bracket too fast, it is very easy to cause strain or injury to the patients' legs, which not only affects the patients' recovery progress, but also affects the safety of the leg muscle training device in actual application. Summary of the invention

[0005] In view of this, the present invention provides a leg muscle rehabilitation exercise device, which, when in use, can use the upper limbs or lower limbs as the main force points according to the patient's own exercise status during the exercise process, so as to exercise the patient's leg muscles and nerves, and during the exercise process, according to the patient's pushing speed of the load bracket, the patient's exercise frequency is monitored in real time. When the patient pushes the load bracket too fast, the centrifugal force generated when the resistance-increasing transmission shaft rotates is utilized to automatically start the monitoring auxiliary mechanism, so that the sound and light alarm sounds to warn the patient, thereby ensuring the patient's recovery progress, and also improving the use effect and safety of the leg muscle exercise device in actual application.

[0006] The present invention provides a leg muscle rehabilitation exercise device, which specifically includes: a support base, a back support, an angle adjustment mechanism, a resistance-increasing transmission shaft, an exercise auxiliary mechanism, a load adjustment mechanism, an audible and visual alarm, and a monitoring auxiliary mechanism. The back support is hingedly arranged on the outer side of the rear end surface of the support base; the left and right ends of the back support are coaxially fixedly connected with a connecting support shaft; the connecting support shaft is hingedly connected to the support base; the angle adjustment mechanism is arranged between the connecting support shaft and the support base; there are two resistance-increasing transmission shafts, which are rotatably connected to the left and right sides of the inner end of the support base respectively; the outer end surface of the resistance-increasing transmission shaft is coaxially fixedly connected with a connecting support plate; The exercise auxiliary mechanism is arranged between the support base and the resistance-increasing transmission shaft; the exercise auxiliary mechanism includes: a load bracket, there are two load brackets, and the two load brackets are respectively slidably arranged on the left and right sides of the front end of the support base; a force component auxiliary frame is slidably arranged behind the load bracket; the load adjustment mechanism is arranged between the resistance-increasing transmission shaft and the support base; there are two sound and light alarms, and the two sound and light alarms are respectively fixedly connected to the outer end surfaces of the two connecting support plates; the monitoring auxiliary mechanism is arranged between the sound and light alarm and the resistance-increasing transmission shaft; the monitoring auxiliary mechanism includes: a sliding bracket, there are two sliding brackets, and the two sliding brackets are respectively slidably connected to the outer sides of the two resistance-increasing transmission shafts.

[0007] Furthermore, the inner end surface of the load bracket is fixedly connected with a first transmission rack; the inner end surface of the force distribution auxiliary frame is fixedly connected with a second transmission rack; the first transmission rack and the second transmission rack on the same side are arranged diagonally;

[0008] The exercise auxiliary mechanism also includes: a transmission gear; there are two transmission gears, and the two transmission gears are respectively fixedly connected to the outer sides of the two resistance-increasing transmission shafts; the transmission gear on the same side is meshed with the first transmission rack and the second transmission rack;

[0009] A scroll elastic member is fixedly connected between the resistance-increasing transmission shaft and the support base.

[0010] Furthermore, a boost block is fixedly connected to the outer end surface of the sliding bracket;

[0011] A push switch is arranged on the inner end surface of the sound and light alarm; the positions of the push switches and the power-assisting blocks on the same left and right sides are relatively straight.

[0012] Furthermore, the outer end surface of the sliding bracket is slidably connected to a positioning auxiliary block; the outer end of the positioning auxiliary block is hinged to a first connecting rod; the outer end of the first connecting rod is hinged to a second connecting rod; the outer end of the second connecting rod is hingedly connected to the connecting support plate.

[0013] Furthermore, a counterweight support shaft is hinged at the connection between the first connecting rod and the second connecting rod; and a gravity ball is fixedly connected to the outer end of the counterweight support shaft.

[0014] Furthermore, a guide shaft is slidably connected to the lower end of the sliding bracket; and the guide shaft is fixedly connected to the support base.

[0015] Furthermore, the angle adjustment mechanism includes: a driving worm and a driving worm wheel, there are two driving worms, and the two driving worms are respectively vertically rotated and arranged on the outside of the two connecting support shafts, and the driving worms at both ends have the same pitch and opposite rotation direction; there are two driving worm wheels, and the two driving worm wheels are respectively coaxially fixedly connected to the outside of the connecting support shaft; the driving worm wheel and the driving worm on the same side are meshed with each other.

[0016] Furthermore, the angle adjustment mechanism also includes: a driving auxiliary shaft, two driving auxiliary shafts, and the two driving auxiliary shafts are respectively vertically rotated and arranged on the outside of the two driving worms; the inner end surface of the driving auxiliary shaft is coaxially fixedly connected with a driving bevel gear; the bottom end surface of the driving worm is coaxially fixedly connected with a driven bevel gear; the driven bevel gear and the driving bevel gear on the same side are meshed with each other.

[0017] Furthermore, the load adjustment mechanism includes: a driving screw, which has two groups, and the two groups of driving screws are respectively arranged vertically and rotatably on the left and right sides below the two resistance-increasing transmission shafts; a pulley transmission assembly is arranged between the driving screws on the same side; an adjustment auxiliary shaft is arranged vertically and rotatably below the outer end of the driving screw; a bevel gear transmission assembly is arranged between the adjustment auxiliary shaft and the driving screw.

[0018] Furthermore, the load adjustment mechanism also includes: a load adjustment control unit, which has two load adjustment controls, and the two load adjustment controls are respectively slidably arranged on the left and right sides below the two resistance-increasing transmission shafts; a U-shaped groove is provided at the upper end of the inner side of the load adjustment control unit; the position of the load adjustment control unit and the resistance-increasing transmission shaft are relatively aligned; a limiting guide groove is provided on the inner side of the support base at the alignment position with the load adjustment control unit; a transmission auxiliary hole is provided on the inner side of the load adjustment control unit; the transmission auxiliary hole on the same side is threadedly connected to the drive screw.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] When the present invention is in use, during the exercise process, the patient can use the upper limbs or lower limbs as the main force point according to the exercise status of the patient, so as to exercise the patient's leg muscles and nerves. During the exercise process, according to the patient's pushing speed of the load bracket, real-time monitoring of the patient's exercise frequency is achieved. When the patient pushes the load bracket too fast, the centrifugal force generated when the resistance-increasing transmission shaft rotates is utilized to automatically start the monitoring auxiliary mechanism, so that the sound and light alarm sounds to warn the patient, thereby ensuring the patient's recovery progress, and also improving the use effect and safety of the leg muscle training device in actual application.

[0021] When the present invention is in use, the adjustment and control of the support angle of the back support is achieved, the comfort level of the patient during exercise is improved, and the flexibility and scope of application of the device in actual application are further improved.

[0022] In addition, when in use, the present invention realizes separate control and adjustment of the load forces of the two load brackets, meets the patient's usage needs in different recovery stages and situations, improves the applicability and flexibility of the device in actual application, and further enhances the use effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0024] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0025] In the attached picture:

[0026] Figure 1 It is an overall isometric structural schematic diagram of the present invention.

[0027] Figure 2 It is a structural schematic diagram of the exercise auxiliary mechanism of the present invention.

[0028] Figure 3 It is a schematic diagram of the connection structure between the positioning auxiliary block and the first connecting rod of the present invention.

[0029] Figure 4 It is a schematic diagram of the installation structure of the resistance-increasing transmission shaft and the monitoring auxiliary mechanism of the present invention.

[0030] Figure 5 It is a cross-sectional structural schematic diagram of the load adjustment mechanism of the present invention.

[0031] Figure 6 It is a schematic diagram of the installation structure of the load adjustment mechanism and the resistance-increasing transmission shaft of the present invention.

[0032] Figure 7 It is a schematic diagram of the connection structure between the back support and the angle adjustment mechanism of the present invention.

[0033] Figure 8 The present invention Figure 7 Schematic diagram of the local enlarged structure at point A in the middle.

[0034] Reference numerals list

[0035] 1. Support base; 2. Back bracket; 201. Connecting support shaft; 3. Driving worm; 301. Driving worm wheel; 302. Driving auxiliary shaft; 303. Active bevel gear; 304. Driven bevel gear; 4. Resistance increasing transmission shaft; 401. Scroll elastic member; 402. Connecting support plate; 5. Load bracket; 501. Force distribution auxiliary frame; 502. First transmission rack; 503. Second transmission rack; 504. Transmission gear; 6. Driving screw; 601. Pulley transmission assembly; 602. Adjustment auxiliary shaft; 603. Bevel gear transmission assembly; 604. Load adjustment control unit; 605. Transmission auxiliary hole; 7. Sound and light alarm; 701. Press switch; 8. Sliding bracket; 801. Power assist block; 802. Guide shaft; 803. Positioning auxiliary block; 804. First connecting rod; 805. Second connecting rod; 806. Counterweight support shaft; 807. Gravity ball. DETAILED DESCRIPTION

[0036] Example 1: Please refer to Figures 1 to 4 As shown:

[0037] The present invention provides a leg muscle rehabilitation exercise device, comprising a support base 1, a back support 2, an angle adjustment mechanism, a resistance-increasing transmission shaft 4, an exercise auxiliary mechanism, a load adjustment mechanism, an audible and visual alarm 7 and a monitoring auxiliary mechanism, wherein the back support 2 is hingedly arranged on the outer side of the rear end surface of the support base 1; the left and right ends of the back support 2 are coaxially fixedly connected with a connecting support shaft 201; the connecting support shaft 201 is hingedly connected to the support base 1; the angle adjustment mechanism is arranged between the connecting support shaft 201 and the support base 1; there are two resistance-increasing transmission shafts 4, and the two resistance-increasing transmission shafts 4 are rotatably connected to the left and right sides of the inner end of the support base 1 respectively; the outer end surface of the resistance-increasing transmission shaft 4 is coaxially fixedly connected with a connecting support plate 402; the exercise auxiliary mechanism The auxiliary mechanism is arranged between the support base 1 and the resistance-increasing transmission shaft 4; the exercise auxiliary mechanism includes: a load bracket 5, there are two load brackets 5, and the two load brackets 5 are respectively slidably arranged on the left and right sides of the front end of the support base 1; a force component auxiliary frame 501 is slidably arranged behind the load bracket 5; the load adjustment mechanism is arranged between the resistance-increasing transmission shaft 4 and the support base 1; there are two sound and light alarms 7, and the two sound and light alarms 7 are respectively fixedly connected to the outer end surfaces of the two connecting support plates 402; the monitoring auxiliary mechanism is arranged between the sound and light alarm 7 and the resistance-increasing transmission shaft 4; the monitoring auxiliary mechanism includes: a sliding bracket 8, there are two sliding brackets 8, and the two sliding brackets 8 are respectively slidably connected to the outer sides of the two resistance-increasing transmission shafts 4.

[0038] The inner end surface of the load bracket 5 is fixedly connected with a first transmission rack 502; the inner end surface of the force distribution auxiliary frame 501 is fixedly connected with a second transmission rack 503; the first transmission rack 502 and the second transmission rack 503 on the same side are arranged diagonally;

[0039] The exercise auxiliary mechanism also includes: a transmission gear 504; there are two transmission gears 504, and the two transmission gears 504 are respectively fixedly connected to the outer sides of the two resistance-increasing transmission shafts 4; the transmission gears 504 on the same side are meshed with the first transmission rack 502 and the second transmission rack 503;

[0040] A scroll elastic member 401 is fixedly connected between the resistance-increasing transmission shaft 4 and the support base 1 .

[0041] The outer end surface of the sliding bracket 8 is fixedly connected with a booster block 801;

[0042] A push switch 701 is provided on the inner end surface of the sound and light alarm 7; the positions of the push switches 701 and the power assisting blocks 801 on the same left and right sides are relatively aligned.

[0043] Among them, the outer end surface of the sliding bracket 8 is slidably connected with a positioning auxiliary block 803; the outer end of the positioning auxiliary block 803 is hinged with a first connecting rod 804; the outer end of the first connecting rod 804 is hinged with a second connecting rod 805; the outer end of the second connecting rod 805 is hingedly connected to the connecting support plate 402.

[0044] A counterweight support shaft 806 is hinged at the connection between the first connecting rod 804 and the second connecting rod 805 ; and a gravity ball 807 is fixedly connected to the outer end of the counterweight support shaft 806 .

[0045] The lower end of the sliding bracket 8 is slidably connected with a guide shaft 802 ; the guide shaft 802 is fixedly connected to the support base 1 .

[0046] The specific usage and function of this embodiment are as follows:

[0047] When the present invention is in use, the patient steps on the load bracket 5 with the sole of the foot and holds the force auxiliary bracket 501 with the palm of the hand. In the process of pushing the load bracket 5 with the sole of the foot, the leg nerves and muscles are exercised. When the patient feels more strenuous during the exercise, the palm of the hand can be used as a force point to push the force auxiliary bracket 501. In the process of pushing the force auxiliary bracket 501 to slide, the second transmission rack 503 drives the transmission gear 504 to rotate. In the process of the transmission gear 504 rotating, the first transmission rack 502 and the load bracket 5 are pushed to slide synchronously, and the scroll elastic member 401 realizes the load bracket 501. Automatic resetting of the carrier bracket 5 and the force auxiliary bracket 501; during the patient's exercise, due to the influence of the centrifugal force when the resistance-increasing transmission shaft 4 rotates, the first connecting rod 804, the second connecting rod 805 and the gravity ball 807 are swung outward. During the outward swing of the gravity ball 807, the second connecting rod 805 drags the sliding bracket 8 to slide outward. When the patient's exercise frequency exceeds a specific value too quickly and the sliding bracket 8 slides outward to a specified position, the assisting block 801 squeezes the pressing switch 701. At this time, the sound and light alarm 7 automatically starts to warn the patient, allowing the patient to adjust the exercise frequency by himself.

[0048] Example 2: Please refer to Figures 4 to 8 As shown:

[0049] Based on Example 1:

[0050] Among them, the angle adjustment mechanism includes: a driving worm 3 and a driving worm wheel 301. There are two driving worms 3. The two driving worms 3 are respectively vertically rotated and arranged on the outside of the two connecting support shafts 201. The driving worms 3 at both ends have the same pitch and opposite rotation direction; there are two driving worm wheels 301. The two driving worm wheels 301 are respectively coaxially fixedly connected to the outside of the connecting support shaft 201; the driving worm wheels 301 and the driving worm 3 on the same side are meshed with each other.

[0051] Among them, the angle adjustment mechanism also includes: a driving auxiliary shaft 302, there are two driving auxiliary shafts 302, and the two driving auxiliary shafts 302 are respectively vertically rotated and arranged on the outside of the two driving worms 3; the inner end face of the driving auxiliary shaft 302 is coaxially fixedly connected with the active bevel gear 303; the bottom end face of the driving worm 3 is coaxially fixedly connected with the driven bevel gear 304; the driven bevel gear 304 and the active bevel gear 303 on the same side are meshed with each other.

[0052] Among them, the load adjustment mechanism includes: a driving screw 6, there are two groups of driving screws 6, and the two groups of driving screws 6 are respectively arranged vertically and rotatably on the left and right sides below the two resistance-increasing transmission shafts 4; a pulley transmission assembly 601 is arranged between the driving screws 6 on the same side; an adjustment auxiliary shaft 602 is arranged vertically and rotatably below the outer end driving screw 6; a bevel gear transmission assembly 603 is arranged between the adjustment auxiliary shaft 602 and the driving screw 6.

[0053] Among them, the load adjustment mechanism also includes: a load adjustment control unit 604, there are two load adjustment control units 604, and the two load adjustment control units 604 are respectively slidably arranged on the left and right sides below the two resistance-increasing transmission shafts 4; a U-shaped groove is provided at the upper end of the inner side of the load adjustment control unit 604; the position of the load adjustment control unit 604 and the resistance-increasing transmission shaft 4 are relatively aligned; a limited position guide groove is provided on the inner side of the support base 1 and at the alignment position with the load adjustment control unit 604; a transmission auxiliary hole 605 is provided on the inner side of the load adjustment control unit 604; the transmission auxiliary hole 605 on the same side is threadedly connected to the drive screw 6.

[0054] The specific usage and function of this embodiment are as follows:

[0055] When the present invention is in use, when the auxiliary driving shafts 302 on both sides are pushed to rotate, the active bevel gear 303 pushes the driven bevel gear 304 and the driving worm 3 to rotate in the same direction. During the rotation of the driving worm 3, the driving worm wheel 301 and the connecting support shaft 201 are pushed to rotate to realize the control and adjustment of the support angle of the back bracket 2; when the auxiliary driving shaft 302 is pushed to rotate, the cooperation of the bevel gear transmission assembly 603 and the pulley transmission assembly 601 is adopted to realize the synchronous rotation of the two driving screws 6. During the rotation of the two driving screws 6, the transmission auxiliary hole 605 pushes the load adjustment control unit 604 to slide upward or downward at the same time. In the process of adjusting the load adjustment control unit 604 up and down, the control of the contact area between the U-shaped groove and the resistance-increasing transmission shaft 4 is realized. In the process of controlling the contact area between the resistance-increasing transmission shaft 4 and the U-shaped groove, the adjustment of the patient's exercise intensity is realized.

Claims

1. A leg muscle rehabilitation training device, comprising: A support base, a back bracket, an angle adjustment mechanism, a resistance-increasing transmission shaft, an exercise-assisting mechanism, a load adjustment mechanism, an audible and visual alarm, and a monitoring-assisting mechanism, wherein the back bracket is hingedly arranged on the outer side of the rear end face of the support base; the left and right ends of the back bracket are coaxially fixedly connected with connecting support shafts; the connecting support shaft is hingedly connected to the support base; it is characterized in that: the angle adjustment mechanism is arranged between the connecting support shaft and the support base; there are two resistance-increasing transmission shafts, which are rotatably connected to the left and right sides of the inner end of the support base respectively; the outer end face of the resistance-increasing transmission shaft is coaxially fixedly connected with a connecting support plate; the exercise-assisting mechanism is arranged on the support base. The training auxiliary mechanism includes: a load bracket, which has two load brackets, which are respectively slidably arranged on the left and right sides of the front end of the support base; a force component auxiliary bracket is slidably arranged behind the load bracket; the load adjustment mechanism is arranged between the resistance-increasing transmission shaft and the support base; there are two sound and light alarms, which are respectively fixedly connected to the outer end surfaces of the two connecting support plates; the monitoring auxiliary mechanism is arranged between the sound and light alarm and the resistance-increasing transmission shaft; the monitoring auxiliary mechanism includes: a sliding bracket, which has two sliding brackets, which are respectively slidably connected to the outer sides of the two resistance-increasing transmission shafts.

2. A leg muscle rehabilitation training device as claimed in claim 1, characterized in that: The inner end surface of the load bracket is fixedly connected with a first transmission rack; the inner end surface of the force distribution auxiliary frame is fixedly connected with a second transmission rack; the first transmission rack and the second transmission rack on the same side are arranged diagonally; The exercise auxiliary mechanism also includes: a transmission gear; there are two transmission gears, and the two transmission gears are respectively fixedly connected to the outer sides of the two resistance-increasing transmission shafts; the transmission gear on the same side is meshed with the first transmission rack and the second transmission rack; A scroll elastic member is fixedly connected between the resistance-increasing transmission shaft and the support base.

3. A leg muscle rehabilitation training device as claimed in claim 1, characterized in that: The outer end surface of the sliding bracket is fixedly connected with a boosting block; A push switch is arranged on the inner end surface of the sound and light alarm; the positions of the push switches and the power-assisting blocks on the same left and right sides are relatively straight.

4. A leg muscle rehabilitation training device as claimed in claim 1, characterized in that: The outer end surface of the sliding bracket is slidably connected with a positioning auxiliary block; the outer end of the positioning auxiliary block is hinged with a first connecting rod; the outer end of the first connecting rod is hinged with a second connecting rod; the outer end of the second connecting rod is hingedly connected to the connecting support plate.

5. A leg muscle rehabilitation exercise device as claimed in claim 4, characterized in that: A counterweight support shaft is hinged at the connection between the first connecting rod and the second connecting rod; and a gravity ball is fixedly connected to the outer end of the counterweight support shaft.

6. A leg muscle rehabilitation exercise device as claimed in claim 1, characterized in that: The lower end of the sliding bracket is slidably connected with a guide shaft; the guide shaft is fixedly connected to the support base.

7. A leg muscle rehabilitation exercise device as claimed in claim 1, characterized in that: The angle adjustment mechanism includes: a driving worm and a driving worm wheel. There are two driving worms, which are vertically rotated and arranged on the outsides of two connecting shafts respectively, and the driving worms at both ends have the same pitch and opposite rotation directions; there are two driving worm wheels, which are coaxially fixedly connected to the outsides of the connecting shafts respectively; the driving worm wheels and the driving worms on the same side are meshed with each other.

8. A leg muscle rehabilitation exercise device as claimed in claim 7, characterized in that: The angle adjustment mechanism also includes: a driving auxiliary shaft, two of which are vertically rotatably arranged on the outsides of two driving worms; an inner end face of the driving auxiliary shaft is coaxially fixedly connected with a driving bevel gear; a bottom end face of the driving worm is coaxially fixedly connected with a driven bevel gear; the driven bevel gear and the driving bevel gear on the same side are meshed with each other.

9. A leg muscle rehabilitation exercise device as claimed in claim 1, characterized in that: The load adjustment mechanism includes: a driving screw rod, which has two groups. The two groups of driving screw rods are respectively arranged vertically and rotatably on the left and right sides below the two resistance-increasing transmission shafts; a pulley transmission assembly is arranged between the driving screw rods on the same side; an adjustment auxiliary shaft is arranged vertically and rotatably below the outer end of the driving screw rod; a bevel gear transmission assembly is arranged between the adjustment auxiliary shaft and the driving screw rod.

10. A leg muscle rehabilitation exercise device as claimed in claim 9, characterized in that: The load adjustment mechanism also includes: a load adjustment control unit, which has two load adjustment controls, and the two load adjustment controls are slidably arranged on the left and right sides below the two resistance-increasing transmission shafts respectively; a U-shaped groove is provided at the upper end of the inner side of the load adjustment control unit; the position of the load adjustment control unit and the resistance-increasing transmission shaft are relatively aligned; a limited position guide groove is provided on the inner side of the support base at the alignment position with the load adjustment control unit; a transmission auxiliary hole is provided on the inner side of the load adjustment control unit; the transmission auxiliary hole on the same side is threadedly connected to the driving screw.

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