阅读说明：本技术 一种康复训练用胳膊恢复器及使用方法 (Arm restorer for rehabilitation training and using method ) 是由 王娜 于 2020-12-08 设计创作，主要内容包括：本发明提供一种康复训练用胳膊恢复器及使用方法,涉及胳膊恢复训练领域。该康复训练用胳膊恢复器,包括底座、竖杆、横杆和两个导向轮,所述竖杆与底座的上表面左端固定连接,横杆与竖杆的上端固定连接,两个导向轮分别安装在横杆的左右两端,底座的上表面前后两端均固定安装有支撑板,两个支撑板之间设置有导向筒,导向筒的下端分别与两个支撑板铰接,导向筒与支撑板的旋转轴处固定安装有踏板,导向筒的下端固定安装有分重机构,分重机构与导向筒的内部连通。该康复训练用胳膊恢复器通过拉动拉杆带动拉绳拉动套筒,达到了较为轻松改变配重多少的效果,解决了现有技术的胳膊拉伸装置,不适宜老年人以及胳膊受伤的人使用的问题。(The invention provides an arm restorer for rehabilitation training and a using method thereof, and relates to the field of arm restoration training. This arm restorer for rehabilitation training, including base, montant, horizontal pole and two leading wheels, the montant is with the upper surface left end fixed connection of base, the upper end fixed connection of horizontal pole and montant, and both ends about the horizontal pole are installed respectively to two leading wheels, and the equal fixed mounting in both ends around the upper surface of base has the backup pad, is provided with the guide cylinder between two backup pads, and the lower extreme of guide cylinder is articulated with two backup pads respectively, and the rotation axis department fixed mounting of guide cylinder and backup pad has the footboard, and the lower extreme fixed mounting of guide cylinder has the weight of branch to construct, divides the inside intercommunication of weight of mechanism and guide cylinder. This arm restorer for rehabilitation drives stay cord pulling sleeve through the pulling pull rod, has reached the effect that comparatively easily changes how much of counter weight, has solved prior art's arm stretching device, is unsuitable for the problem that old person and arm injured person used.)

1. The utility model provides an arm restorer for rehabilitation training, includes base (1), montant (2), horizontal pole (3) and two leading wheels (4), its characterized in that: the upper surface of the base is characterized in that the vertical rod (2) is fixedly connected with the left end of the upper surface of the base (1), the cross rod (3) is fixedly connected with the upper end of the vertical rod (2), the two guide wheels (4) are respectively installed at the left end and the right end of the cross rod (3), the front end and the rear end of the upper surface of the base (1) are respectively fixedly provided with the supporting plates (5), a guide cylinder (6) is arranged between the two supporting plates (5), the lower end of the guide cylinder (6) is respectively hinged with the two supporting plates (5), the rotating shaft of the guide cylinder (6) and the supporting plates (5) is fixedly provided with the pedal (7), the lower end of the guide cylinder (6) is fixedly provided with the weight dividing mechanism (8), the weight dividing mechanism (8) is communicated with the inside of the guide cylinder (6), the weight dividing mechanism (8) is provided with the balance weight mechanism (9), the upper end of the balance weight mechanism (9) is slidably connected with the guide cylinder (6), the lower end of the balance weight mechanism (9) is fixedly provided with the pressure rod (10), the pressing rod (10) is connected with the lower end of the counterweight mechanism (9) in a sliding mode, an arc-shaped plate (11) is fixedly installed on the upper surface of the base (1) below the counterweight mechanism (8), the lower end of the pressing rod (10) is provided with a roller (12), and the roller (12) is in contact with the inner wall of the arc-shaped plate (11);

a pull rope (13) is fixedly installed at the upper end of the counterweight mechanism (9), one end, far away from the counterweight mechanism (9), of the pull rope (13) penetrates through the guide cylinder (6) and then is in transmission connection with the two guide wheels (4), and a pull rod (14) is fixedly installed after the pull rope (13) penetrates through the two guide wheels (4);

the weight-dividing mechanism (8) comprises a bottom plate (801), three limiting rings (802) and two balancing weights A (803), the three limiting rings (802) are all located above the bottom plate (801), the limiting ring (802) located at the lowest position is fixedly connected with the bottom plate (801), the left end of the upper surface of each limiting ring (802) is fixedly provided with an arc-shaped limiting sleeve (804), the two adjacent limiting rings (802) are fixedly connected with the arc-shaped limiting sleeves (804), the guide cylinder (6) is fixedly connected with the bottom plate (801) through two connecting rods (15), the two balancing weights A (803) are fixedly connected with the bottom plate (801), and the balancing weight mechanism (9) is inserted into the three limiting rings (802);

the counterweight mechanism (9) comprises a sleeve (901), three sliding sleeves (902), three counterweight plates (903) and a push rod (904), the sleeve (901) penetrates through three limiting rings (802) and a bottom plate (801), the sleeve (901) is provided with two sliding chutes (905) which are communicated left and right, the three sliding sleeves (902) are respectively sleeved outside the sleeve (901), the sliding sleeve (902) positioned above is fixedly connected with the sleeve (901), two sliding blocks (906) are arranged inside the sleeve (901), two ends of the two sliding blocks (906) penetrate through the sleeve (901) and then are respectively fixedly connected with the two sliding sleeves (902) positioned below, two semicircular sleeves (907) are respectively clamped outside the right sides of the three sliding sleeves (902), the counterweight plates (903) are positioned between the two semicircular sleeves (907), the counterweight plates (903) are rotatably connected with the sliding sleeves (902), the right ends of the upper surfaces of the counterweight plates (903) are respectively and fixedly provided with counterweight blocks B (908), the front end and the rear end of the left side surface of the counterweight plate (903) are respectively provided with a vertically through limiting groove (909), the upper end of the ejector rod (904) is inserted into the sleeve (901), the ejector rod (904) penetrates through the two sliding blocks (906), the outer part of the ejector rod (904) is positioned below the sliding blocks (906) and is fixedly sleeved with a limiting ring (910), a spring (911) is sleeved between the sliding block (906) and the limiting ring (910) of the ejector rod (904) positioned below, the upper end of the spring (911) is fixedly connected with the sliding blocks (906), the lower end of the spring (911) is fixedly connected with the limiting ring (910), the compression rod (10) is fixedly connected with the lower end of the ejector rod (904), the upper end of the sleeve (901) is slidably connected with the guide cylinder (6), and one end of the pull rope (13) is fixedly connected with the upper end of the sleeve (901);

the guide cylinder (6) is of a semicircular structure, the upper end of the sleeve (901) is fixedly sleeved with a sliding sleeve (902), and the sliding sleeve (902) is in sliding connection with the guide cylinder (6);

the clamping sleeve (16) is fixedly sleeved on the bottom surface of the bottom plate (801), and the pressure lever (10) is inserted into the clamping sleeve (16) and is connected with the clamping sleeve in a sliding manner;

the arc-shaped plate (11) is of a U-shaped structure, and the arc-shaped plate (11) is of a symmetrical structure.

2. The arm recovery device for rehabilitation training as claimed in claim 1, wherein: the arc-shaped limiting sleeve (804) is of a semicircular structure, and the longitudinal section of the arc-shaped limiting sleeve (804) is of a U-shaped structure.

3. The arm recovery device for rehabilitation training as claimed in claim 1, wherein: the front surface and the rear surface of the inner wall of the limiting ring (802) are fixedly provided with limiting rods (805), and the arc-shaped limiting sleeve (804) and the limiting ring (802) are concentrically arranged and have the same radius.

4. The arm recovery device for rehabilitation training as claimed in claim 1, wherein: the counterweight plate (903) is of a semicircular structure, and the counterweight block B (908) is located on the bisector central line of the counterweight plate (903).

5. The use method of the arm restorer for rehabilitation training as claimed in any one of claims 1 to 4, wherein: when the device is used, the pull rod (14) is pulled to drive the pull rope (13) to pull the sleeve (901), the sleeve (901) drives the three weight plates (903) to rise when rising, the effect of stretching and exercising the arms is realized, when the number of the weight plates (903) needs to be changed, the pedal (7) is stepped, the guide cylinder (6) drives the weight dividing mechanism (8) to incline, the upper end of the guide cylinder (6) inclines leftwards, the roller (12) advances along the arc-shaped plate (11) when inclining, because the rotating positions of the arc-shaped plate (11) and the guide cylinder (6) are not on the same center of circle, when the roller (12) advances, the roller (12) is gradually pressed by the pressure rod (10), when the pressure rod (10) presses the push rod (904), the push rod (904) can firstly take the weight plate (903) at the lowest to rise, and when the weight plate (903) rises between the two limiting rings (802), under the action of gravity, the counterweight plate (903) begins to rotate towards the arc-shaped limiting sleeve (804), the special shape of the arc-shaped limiting sleeve (804) can limit the counterweight plate (903), meanwhile, the weight plates (903) lose the limit of the limiting rod (805) and the two semicircular sleeves (907), when the sleeve (901) is forced to move upwards again, the pressure of one weight plate (903) is reduced, if step on footboard (7) continuously, ejector pin (904) can upwards continue to push up and drive spring (911) compression, spacing ring (910) of top can push up middle slider (906), middle weight plate (903) can move between two stop collars this moment, and in the same way weight plate (903) can move between arc stop collars (804), otherwise when increasing weight plate (903), collude footboard (7), weight plate (903) can receive gravity and get back to between two semicircle covers (907).

Technical Field

The invention relates to the field of arm recovery training, in particular to an arm recovery device for rehabilitation training and a using method thereof.

Background

The stroke and hemiplegia of the shoulder joints of the old are caused by the hemiluxation of the shoulder joints, the incidence rate of the condition is larger, most patients can suffer from the hemiluxation, most of the hemiparalysis occur within 3 weeks after the disease, particularly under the condition of the relaxed upper limbs, because the peripheral muscles of the shoulder joints such as the relaxation of the upper sentry muscle, the lower sentry muscle, the deltoid muscle, the pectoralis major muscle and the pectoralis minor muscle reduce the strength of a stabilizing mechanism for fixing the shoulder joints, and the shoulder joints are separated from the normal position due to the downward displacement of the affected upper limbs caused by the gravity traction. At present, the upper limb shoulder joint needs to be slowly moved to recover after being cured.

When in exercise, the effect of exercising the arms is achieved by increasing or reducing the stretching and bearing force of the arms, generally speaking, arm stretching equipment needs to increase or reduce the weight blocks to change the resistance, but if the arms are injured or the arms are not forced, the counter weight cannot be independently replaced, the exercise of a patient is influenced, and the carrying and replacement of the counter weight are not beneficial to the use of the old.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides an arm restorer for rehabilitation training, which solves the problems in the background art.

In order to achieve the purpose, the invention is realized by the following technical scheme: an arm restorer for rehabilitation training comprises a base, a vertical rod, a cross rod and two guide wheels, wherein the vertical rod is fixedly connected with the left end of the upper surface of the base, the cross rod is fixedly connected with the upper end of the vertical rod, the two guide wheels are respectively installed at the left end and the right end of the cross rod, supporting plates are respectively and fixedly installed at the front end and the rear end of the upper surface of the base, a guide cylinder is arranged between the two supporting plates, the lower end of the guide cylinder is respectively hinged with the two supporting plates, pedals are fixedly installed at the rotating shafts of the guide cylinder and the supporting plates, a weight dividing mechanism is fixedly installed at the lower end of the guide cylinder and is communicated with the inside of the guide cylinder, a counterweight mechanism is arranged inside the weight dividing mechanism, the upper end of the counterweight mechanism is slidably connected with the guide cylinder, a pressing rod is fixedly installed at the lower end of the counterweight mechanism and is slidably connected with the lower end of the counterweight mechanism, an arc-shaped plate is fixedly installed below the weight dividing mechanism on the upper surface of the base, the lower end of the pressure lever is provided with a roller which is contacted with the inner wall of the arc-shaped plate.

The upper end of the counterweight mechanism is fixedly provided with a pull rope, one end of the pull rope, far away from the counterweight mechanism, penetrates through the guide cylinders and then is in transmission connection with the two guide wheels, and the pull rod is fixedly arranged after the pull rope penetrates through the two guide wheels.

The weight-dividing mechanism comprises a bottom plate, three spacing rings and two balancing weights A, wherein the three spacing rings are located above the bottom plate and located below the bottom plate, arc-shaped spacing sleeves are fixedly mounted at the left ends of the upper surfaces of the spacing rings, the two adjacent spacing rings are fixedly connected with the arc-shaped spacing sleeves, the guide cylinder is fixedly connected with the bottom plate through two connecting rods, the two balancing weights A are fixedly connected with the bottom plate, and the balancing weights are inserted into the three spacing rings.

The counterweight mechanism comprises a sleeve, three sliding sleeves, three counterweight plates and an ejector rod, wherein the sleeve penetrates through three limiting rings and a bottom plate, the sleeve is provided with two chutes which are communicated from left to right, the three sliding sleeves are respectively sleeved outside the sleeve, the sliding sleeve positioned above the sleeve is fixedly connected with the sleeve, the sleeve is internally provided with two sliding blocks, two ends of the two sliding blocks are respectively fixedly connected with the two sliding sleeves positioned below the sleeve after penetrating through the sleeve, two semicircular sleeves are respectively clamped outside the right sides of the three sliding sleeves, the counterweight plate is positioned between the two semicircular sleeves, the counterweight plates are rotatably connected with the sliding sleeves, the right end of the upper surface of each counterweight plate is fixedly provided with a counterweight block B, the front end and the rear end of the left side surface of each counterweight plate are respectively provided with a vertically-through limiting groove, the upper end of the ejector rod is inserted inside the sleeve, the ejector rod penetrates through the two sliding blocks, and the limiting rings are fixedly sleeved outside the sliding blocks below the ejector rod, the spring is sleeved between the sliding block and the limiting ring, the lower end of the spring is fixedly connected with the limiting ring, the pressing rod is fixedly connected with the lower end of the ejector rod, the upper end of the sleeve is slidably connected with the guide cylinder, and one end of the pull rope is fixedly connected with the upper end of the sleeve.

Preferably, the guide cylinder is of a semicircular structure, the upper end of the sleeve is fixedly sleeved with a sliding sleeve, and the sliding sleeve is in sliding connection with the guide cylinder.

Preferably, the clamping sleeve is fixedly sleeved on the bottom surface of the bottom plate, and the pressure rod is inserted in the clamping sleeve and is in sliding connection with the clamping sleeve.

Preferably, the arc-shaped plate is of a U-shaped structure, and the arc-shaped plate is of a symmetrical structure.

Preferably, the arc-shaped limiting sleeve is of a semicircular structure, and the longitudinal section of the arc-shaped limiting sleeve is of a U-shaped structure.

Preferably, the front and back surfaces of the inner wall of the limiting ring are fixedly provided with limiting rods, and the arc-shaped limiting sleeve and the limiting ring are concentrically arranged and have the same radius.

Preferably, the counterweight plate is of a semicircular structure, and the counterweight block B is positioned on the bisection center line of the counterweight plate.

Compared with the prior art, the invention has the following beneficial effects:

1. the arm restorer for rehabilitation training drives the pull rope to pull the sleeve through the pull rod, the sleeve drives the three weight plates to ascend when ascending, the effects of stretching and exercising arms are achieved, when the number of the weight plates needs to be changed, the pedal is stepped, the guide cylinder drives the weight dividing mechanism to incline, the upper end of the guide cylinder inclines towards the left, when the guide cylinder inclines, the roller moves forwards along the arc-shaped plate, the rotating positions of the arc-shaped plate and the guide cylinder are not on the same circle center, when the roller moves forwards, the roller is gradually pressed by pressure to move the pressure rod, when the pressure rod presses the ejector rod, the ejector rod firstly takes the bottommost weight plate to ascend, when the weight plate ascends between the two limiting rings, the weight plate starts to rotate in the arc-shaped limiting sleeve under the action of gravity, the special shape of the arc-shaped limiting sleeve can lose the weight plates, and meanwhile, the limit rods and the two semi-circular sleeves limit of the weight plate, when the sleeve atress rebound once more, will lack the pressure of a weight plate, if when continuing to step on the footboard, the ejector pin can upwards continue to push up and drive the spring compression, the spacing ring of top can push up the slider in the middle of moving, the weight plate in the middle of this moment can move between two stop collars, the weight plate can move between the arc stop collar with the principle, otherwise when increasing the weight plate, collude the footboard, the weight plate can receive gravity and get back to between two semicircle covers, reached the effect that comparatively light changes how much the counter weight, the arm stretching device of prior art has been solved, be unsuitable for the problem that old person and arm injured's people used.

2. This arm restorer for rehabilitation training through setting up balancing weight A, balancing weight A can provide a flagging force when the guide cylinder does not receive the pedal power, because the articulated position of backup pad and guide cylinder is above, so two balancing weights A can play and make bottom plate and the vertical effect of guide cylinder.

3. This arm restorer for rehabilitation training, through setting up balancing weight B, balancing weight B can increase the sensitive degree that the weight plate received the action of gravity, and in the slope of weight-sharing mechanism, the sleeve also can follow the slope, and weight plate B receives the state that gravity can hardly make weight plate keep balance.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a schematic structural view of the weight-dividing mechanism of the present invention;

FIG. 4 is a schematic view of a portion of the present invention;

FIG. 5 is a schematic view of the connection between the weight dividing mechanism and the weight balancing mechanism according to the present invention;

FIG. 6 is a schematic structural view of a counterweight mechanism according to the present invention;

FIG. 7 is a schematic view of a portion of the counterweight mechanism of the present invention;

fig. 8 is an enlarged view of the structure of fig. 7 at a.

The device comprises a base 1, a vertical rod 2, a cross rod 3, a guide wheel 4, a support plate 5, a guide cylinder 6, a pedal 7, a weight-sharing mechanism 8, a bottom plate 801, a limit ring 802, a balancing weight A803, an arc-shaped limit sleeve 804, a limit rod 805, a counterweight mechanism 9, a sleeve 901, a sliding sleeve 902, a counterweight plate 903, a top rod 904, a sliding chute 905, a slider 906, a semicircular sleeve 907, a balancing weight B908, a limiting groove 909, a limit ring 910, a 911 spring, a 10 compression bar, an arc-shaped plate 11, a roller 12, a pull rope 13, a pull rod 14, a connecting rod 15 and a clamping sleeve 16.

Detailed Description

As shown in fig. 1-8, an arm restorer for rehabilitation training comprises a base 1, a vertical rod 2, a cross rod 3 and two guide wheels 4, wherein the vertical rod 2 is fixedly connected with the left end of the upper surface of the base 1, the cross rod 3 is fixedly connected with the upper end of the vertical rod 2, the two guide wheels 4 are respectively arranged at the left end and the right end of the cross rod 3, supporting plates 5 are respectively fixedly arranged at the front end and the rear end of the upper surface of the base 1, a guide cylinder 6 is arranged between the two supporting plates 5, the lower end of the guide cylinder 6 is respectively hinged with the two supporting plates 5, a pedal 7 is fixedly arranged at the rotating shaft of the guide cylinder 6 and the supporting plates 5, a weight dividing mechanism 8 is fixedly arranged at the lower end of the guide cylinder 6, the weight dividing mechanism 8 is communicated with the inside of the guide cylinder 6, a weight dividing mechanism 9 is arranged inside the weight dividing mechanism 8, the upper end of the weight dividing mechanism 9 is slidably connected with the guide cylinder 6, a pressure lever 10 is fixedly arranged at the lower end of the weight dividing mechanism 9, the lower extreme sliding connection of depression bar 10 and counter weight mechanism 9, the upper surface of base 1 is located the below fixed mounting who divides heavy mechanism 8 has arc 11, and arc 11 is U type structure, and arc 11 is symmetrical structure, and the both ends of arc 11 are the parabola setting that makes progress, and not on a centre of circle with the rotation axis of guide cylinder 6, and gyro wheel 12 is installed to the lower extreme of depression bar 10, and gyro wheel 12 contacts with the inner wall of arc 11.

The upper end of the counterweight mechanism 9 is fixedly provided with a pull rope 13, one end of the pull rope 13, which is far away from the counterweight mechanism 9, penetrates through the guide cylinder 6 and then is in transmission connection with the two guide wheels 4, the pull rope 13 penetrates through the two guide wheels 4 and then is fixedly provided with a pull rod 14, and the guide wheels 4 can realize the effect of extending the pull rope 13.

The weight-dividing mechanism 8 comprises a bottom plate 801, three limiting rings 802 and two balancing weights A803, wherein the three limiting rings 802 are all positioned above the bottom plate 801, the limiting ring 802 positioned at the lowest part is fixedly connected with the bottom plate 801, the left end of the upper surface of the limiting ring 802 is fixedly provided with an arc-shaped limiting sleeve 804, the arc-shaped limiting sleeve 804 is of a semicircular structure, the longitudinal section of the arc-shaped limiting sleeve 804 is of a U-shaped structure, the two adjacent limiting rings 802 are fixedly connected with the arc-shaped limiting sleeve 804, the front and back surfaces of the inner wall of the limiting rings 802 are fixedly provided with limiting rods 805, the arc-shaped limiting sleeve 804 and the limiting rings 802 are concentrically arranged and have the same radius, the guide cylinder 6 is fixedly connected with the bottom plate 801 through two connecting rods 15, the two balancing weights A803 are fixedly connected with the bottom plate 801, the weight-dividing mechanism 9 is inserted in the three limiting rings 802, the bottom surface of the bottom plate 801 is fixedly sleeved with a clamping sleeve 16, the pressing rod 10 is inserted in the interior of the clamping sleeve 16 and is connected with the pressing rod in a sliding manner, the structure of the plunger 10 does not rotate relative to the ferrule 16.

The counterweight mechanism 9 comprises a sleeve 901, three sliding sleeves 902, three counterweight plates 903 and a top rod 904, wherein the sleeve 901 penetrates through three limiting rings 802 and a bottom plate 801, the sleeve 901 is provided with two left and right through sliding grooves 905, the sliding grooves 905 are matched with a limiting rod 805, the three sliding sleeves 902 are respectively sleeved outside the sleeve 901, the sliding sleeve 902 positioned above is fixedly connected with the sleeve 901, two sliding blocks 906 are arranged inside the sleeve 901, two ends of the two sliding blocks 906 penetrate through the sleeve 901 and then are respectively fixedly connected with the two sliding sleeves 902 positioned below, the sliding blocks 906 penetrate through the sliding grooves 905, the sliding grooves 905 can play a role in limiting the sliding blocks 906, two semicircular sleeves 907 are respectively clamped outside the right sides of the three sliding sleeves 902, the counterweight plates 903 are positioned between the two semicircular sleeves 907, the counterweight plates 903 are rotatably connected with the sliding sleeves 902, the right ends of the upper surfaces of the counterweight plates 903 are respectively and fixedly provided with counterweight blocks B908, and the counterweight plates 903 are in semicircular structures, the counterweight block B908 is located on a bisector centerline of the counterweight plate 903, the front end and the rear end of the left side surface of the counterweight plate 903 are provided with vertically-through limiting grooves 909, the upper end of the ejector rod 904 is inserted into the sleeve 901, the ejector rod 904 penetrates through the two sliding blocks 906, the outer portion of the ejector rod 904 is located below the sliding blocks 906 and is fixedly sleeved with the limiting ring 910, a spring 911 is sleeved between the sliding block 906 and the limiting ring 910 below the ejector rod 904, the upper end of the spring 911 is fixedly connected with the sliding block 906, the lower end of the spring 911 is fixedly connected with the limiting ring 910, the compression rod 10 is fixedly connected with the lower end of the ejector rod 904, the upper end of the sleeve 901 is slidably connected with the guide cylinder 6, the guide cylinder 6 is of a semicircular structure, the upper end of the sleeve 901 is fixedly sleeved with a sliding sleeve 902, the sliding sleeve 902 is slidably connected with the guide cylinder 6, and one end of the pull rope 13 is fixedly connected with the upper end of the sleeve 901.

When the device is used, the pull rod 14 is pulled to drive the pull rope 13 to pull the sleeve 901, the sleeve 901 drives the three weight plates 903 to rise when rising, the effects of stretching and exercising the arms are achieved, when the number of the weight plates 903 needs to be changed, the pedal 7 is stepped, the guide cylinder 6 drives the weight distribution mechanism 8 to incline, the upper end of the guide cylinder 6 inclines towards the left, the roller 12 advances along the arc-shaped plate 11 when inclining, because the rotation positions of the arc-shaped plate 11 and the guide cylinder 6 are not on one circle center, when the roller 12 advances, the roller 12 is gradually pressed to press the press rod 10, when the press rod 10 presses the ejector rod 904, the ejector rod 904 firstly lifts the weight plate 903 at the lowest part, when the weight plates 903 rise between the two limiting rings 802, the weight plates 903 start to rotate towards the arc-shaped limiting sleeve 804 due to the action of gravity, the special shape of the arc-shaped limiting sleeve 804 can limit the weight plates 903, meanwhile, the weight plate 903 loses the limitation of the limiting rod 805 and the two semicircular sleeves 907, when the sleeve 901 is stressed to move upwards again, the pressure of one weight plate 903 is reduced, if the pedal 7 is continuously stepped on, the ejector rod 904 can continuously push upwards to drive the spring 911 to compress, the limiting ring 910 above the limiting ring can push the middle sliding block 906, the middle weight plate 903 can move between the two limiting sleeves at the moment, the weight plate 903 in the middle can move between the arc-shaped limiting sleeves 804 in the same way, otherwise, when the weight plate 903 is added, the pedal 7 is hooked, and the weight plate 903 can return to the position between the two semicircular sleeves 907 under the action of gravity.

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