Crank device and limb health training equipment

Abstract

The present invention relates to the field of sports rehabilitation and fitness technology, and specifically to a crank device and limb fitness training equipment. The crank device includes: a drive shaft; a crank structure, fixedly connected to the drive shaft; a hinge, slidingly arranged on the crank structure along the radial direction of the drive shaft; a first connecting rod, one end of which is hinged to the hinge; a sliding member, in contact with the drive shaft, and movable in the axial direction of the drive shaft, and the sliding member is configured to maintain synchronous rotation with the drive shaft; a connecting member, connecting the sliding member and the hinge, and the connecting member is configured to be able to convert the movement of the sliding member along the axial direction of the drive shaft into the movement of the hinge along the radial direction of the drive shaft; a first driving member, rotatably connected to the sliding member, and the first driving member is configured to be able to drive the sliding member to move along the axial direction of the drive shaft; the present invention can solve the technical problem that the existing crank-connecting rod mechanism needs to be shut down before the working length of the crank structure can be adjusted.

Description

Technical Field

[0001] The present invention relates to the field of sports rehabilitation and fitness, and in particular to a crank device and limb fitness training equipment. Background Art

[0002] Crank-connecting rod mechanisms are widely used in various planar mechanical transmission fields due to their simple structure and multiple motion modes. However, in traditional crank-connecting rod mechanisms, the crank and connecting rod are relatively fixed in position, making it impossible to adjust the working length of the crank. Equipment using this crank-connecting rod mechanism may require the length of the crank to be changed due to working conditions, production requirements, or user needs. However, due to the relatively fixed positions of the crank and connecting rod, this makes it difficult to readjust the crank-connecting rod mechanism.

[0003] There are also crank-connecting rod mechanisms in the prior art in which the relative position of the crank and the connecting rod can be adjusted, but the relative position adjustment of these cranks and connecting rods is not continuous and needs to be adjusted manually, which forces the equipment using the crank-connecting rod mechanism to be shut down for processing. On the one hand, it delays the normal use of related equipment. On the other hand, the equipment needs to be disassembled and assembled, which is time-consuming and labor-intensive. Therefore, it is necessary to solve the technical problem that the working length of the crank of the existing crank-connecting rod mechanism needs to be shut down for adjustment. Summary of the Invention

[0004] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a crank device and limb fitness training equipment to solve the technical problem that the working length adjustment of the crank structure of the existing crank-connecting rod mechanism requires the equipment to be shut down for adjustment.

[0005] To achieve the above and other related purposes, the present invention provides a crank device, comprising: a drive shaft;

[0006] a crank structure fixedly connected to the drive shaft;

[0007] a hinged member, slidably disposed on the crank structure along the radial direction of the drive shaft;

[0008] a first connecting rod, one end of which is hinged to the hinge member;

[0009] a sliding member, contacting the drive shaft and being movable in the axial direction of the drive shaft, and configured to be able to rotate synchronously with the drive shaft;

[0010] a connecting member connecting the sliding member and the hinge member, wherein the connecting member is configured to convert movement of the sliding member along the axial direction of the drive shaft into movement of the hinge member along the radial direction of the drive shaft;

[0011] The first driving member is rotatably connected to the sliding member, and the first driving member is configured to drive the sliding member to move along the axial direction of the driving shaft.

[0012] In one embodiment of the present invention, the first driving member includes:

[0013] a pushing member, the pushing member being rotatably connected to the sliding member;

[0014] A first power source is connected to the pushing member, and the first power source is configured to drive the pushing member to move on the driving shaft.

[0015] In one embodiment of the present invention, one end of the connecting member is hinged to the sliding member, and the other end is hinged to the hinge member.

[0016] In one embodiment of the present invention, the first power source includes: a mounting frame;

[0017] A lead screw is rotatably mounted on the mounting frame;

[0018] The first power member is connected to the lead screw in a transmission manner. The first power member is configured to drive the pushing member to move on the mounting bracket through the lead screw.

[0019] In one embodiment of the present invention, the crank structure is disc-shaped.

[0020] In one embodiment of the present invention, the hinges and the connecting members are symmetrically arranged in two groups.

[0021] In one embodiment of the present invention, a rotation pin is provided on the hinged member, and the connecting member is hinged to the hinged member via the rotation pin.

[0022] In one embodiment of the present invention, the first driving member and the sliding member are rotatably connected via a bearing.

[0023] To achieve the above-mentioned and other related purposes, the present invention further provides a limb health training device, comprising the crank device, and further comprising: a second connecting rod;

[0024] a third connecting rod, wherein one end of the second connecting rod is hinged to the first connecting rod, and the other end of the second connecting rod is hinged to the third connecting rod to form a planar connecting rod mechanism;

[0025] a second power source, wherein an output end of the second power source is fixedly connected to the other end of the third connecting rod, and the second power source is configured to drive the third connecting rod to rotate;

[0026] The training part is arranged on the first connecting rod or the second connecting rod.

[0027] To achieve the above-mentioned and other related purposes, the present invention further provides a limb health training device, comprising the crank device, and further comprising: a second driving member;

[0028] a second connecting rod, one end of which is hinged to the first connecting rod, and the other end of which is hinged to the second driving member to form a hinged portion; the second driving member is configured to drive the hinged portion to move;

[0029] The training part is arranged on the first connecting rod or the second connecting rod.

[0030] To achieve the above-mentioned and other related purposes, the present invention further provides a limb health training device, comprising: a crank device;

[0031] a first slide rail; a first slider slidably disposed on the first slide rail; the other end of the first connecting rod is hinged to the first slider;

[0032] The training part is arranged on the first sliding block.

[0033] In summary, the present invention drives the crank structure to rotate by the driving shaft, so that the crank structure drives the first connecting rod to perform crank-connecting rod movement through the hinge; the first driving member drives the sliding member to move along the axial direction of the driving shaft, and the connecting member can convert the axial movement of the sliding member along the driving shaft into the radial movement of the hinge member along the driving shaft, thereby realizing automatic adjustment and control of the distance between the hinge member and the rotation center of the crank structure, avoiding the trouble of manually adjusting the position of the hinge member. At the same time, through the coordinated work of the first driving member, the connecting member, the sliding member and the hinge member, it can be ensured that when the distance between the hinge member and the rotation center of the crank structure is adjusted, the crank structure can rotate normally, thereby meeting the requirements of certain equipment using the crank device of the present invention to not stop when adjusting the movement amplitude of the crank-connecting rod mechanism. At the same time, the present invention can also realize continuous adjustment and high-precision position adjustment of the hinge member on the crank structure, thereby having high practical application value;

[0034] Furthermore, the sliding member is in contact with the drive shaft and is movable in the axial direction of the drive shaft. The sliding member is configured to maintain synchronous rotation with the drive shaft, thereby reducing the support cantilever length of the crank structure and improving the support stiffness and load support capacity of the crank structure. This plays a key role in the support stiffness and load support capacity of the crank structure, ensuring the safety and stability of the training process while maintaining a compact structure, and also reducing the cost of the device.

[0035] The first driving member and the sliding member are rotatably connected through a bearing, and are driven by the first driving member, which can automatically change the position of the sliding member on the driving shaft, thereby adjusting the distance between the hinge and the axis of the driving shaft; the crank structure is set to a disc shape, which can make the crank structure rotate more smoothly, and avoid large rotation pause fluctuations, which is beneficial to improving the performance of the crank device; further, the disc-shaped crank structure is easier to be provided with a slide groove, and also blocks the internal moving mechanism, so that clothes will not be caught during training, ensuring safety; when the crank structure with adjustable working length and other rods form a crank-connecting rod mechanism, the movement law of the training part can be automatically changed by adjusting the working length of the crank structure, which is easy to operate and can meet the training needs of different people and different intensities. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 Schematic diagram of the overall structure of the crank device of the present invention;

[0038] Figure 2 This is a schematic diagram of the structure in which the sliding member of the present invention is sleeved on the drive shaft;

[0039] Figure 3 This is a schematic diagram of the hinge structure of the present invention;

[0040] Figure 4 Schematic diagram of the connection between the crank structure and the first driving member and the driving shaft of the present invention;

[0041] Figure 5 This is a schematic structural diagram of the first driving member of the present invention;

[0042] Figure 6 This is a schematic structural diagram of a first limb health training device of the present invention;

[0043] Figure 7 Schematic diagram of the structure of the second limb health training device of the present invention;

[0044] Figure 8 Schematic diagram of the structure of the third limb health training device of the present invention;

[0045] Component number description: drive shaft 1, crank structure 2, slide groove 21, hinge 3, rotating pin 31, first connecting rod 4, sliding member 5, connecting member 6, first driving member 7, pushing member 71, first power source 72, mounting bracket 721, screw 722, first power member 723, bearing 8, second driving member 9, second power source 91, third connecting rod 92, arc-shaped slide rail 93, second slider 94, second connecting rod 10, training part 11, first slide rail 12, first slider 13. DETAILED DESCRIPTION

[0046] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following examples and the features in the examples can be combined with each other unless they conflict. It should also be understood that the terms used in the examples of the present invention are for the purpose of describing specific embodiments, not for the purpose of limiting the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0047] See also Figures 1 to 8 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0048] When numerical ranges are given in the examples, it should be understood that unless otherwise specified herein, both endpoints of each numerical range and any value between the two endpoints may be used. Unless otherwise defined, all technical and scientific terms used herein are consistent with the prior art as understood by those skilled in the art and the description of the present invention. Any prior art methods, devices, and materials similar or equivalent to those described in the examples of the present invention may also be used to implement the present invention.

[0049] See also Figure 1 and8 , the present invention provides a crank device, comprising: a driving shaft 1;

[0050] A crank structure 2, fixedly connected to the drive shaft 1;

[0051] A hinge 3 is slidably disposed on the crank structure 2 along the radial direction of the drive shaft 1;

[0052] A first connecting rod 4, one end of which is hinged to the hinge member 3;

[0053] a sliding member 5, contacting the drive shaft 1 and being movable in the axial direction of the drive shaft 1, and configured to rotate synchronously with the drive shaft 1;

[0054] a connecting member 6 connecting the sliding member 5 and the hinge member 3, wherein the connecting member 6 is configured to convert the movement of the sliding member 5 along the axial direction of the drive shaft 1 into the movement of the hinge member 3 along the radial direction of the drive shaft 1;

[0055] The first driving member 7 is rotatably connected to the sliding member 5 , and the first driving member 7 is configured to drive the sliding member 5 to move along the axial direction of the driving shaft 1 .

[0056] It should be noted that the fixed connection is at least one of welding, detachable connection achieved by nuts and threads provided on the drive shaft 1, and flange connection; other fixed connection methods that can achieve the same or similar connection are also within the scope of protection of the present invention; the drive shaft 1 is driven to rotate by a motor or by a motor and a reducer; the drive shaft 1 rotates and drives the crank structure 2 to rotate, and the crank structure 2 drives the first connecting rod 4 to move through the hinge 3, such as forming the movement of the crank-connecting rod structure; when it is necessary to adjust the distance between the hinge 3 and the rotation center of the crank structure 2, the sliding member 5 is driven to move along the axial direction of the drive shaft 1 by the first driving member 7, and the sliding member 5 will drive the hinge 3 to move on the crank structure 2 through the connecting member 6, that is, the connecting member 6 can convert the movement of the sliding member 5 along the axial direction of the drive shaft 1 into the movement of the hinge 3 along the radial direction of the drive shaft 1, thereby realizing the hinge 3 approaching or moving away from the rotation center of the crank structure 2. , thereby realizing the adjustment of the movement amplitude of the crank structure 2 driving the first connecting rod 4, thereby forming a crank-connecting rod mechanism with an adjustable turning radius, and the crank-connecting rod mechanism can be widely used in mechanical equipment and mechanical devices. The crank-connecting rod mechanism with an adjustable turning radius can further improve the application range of mechanical equipment and mechanical devices and the performance of the equipment, such as being applied to limb health training devices, machine tools and other machinery; the sliding member 5 is a sleeve structure and is sleeved on the drive shaft 1. By making the sliding member 5 rotatably connected to the first driving member 7, the problem of energy waste caused by the sliding member 5 driving the first driving member 7 to rotate when following the rotation of the crank structure 2 can be avoided; a bearing 8 is provided between the first driving member 7 and the sliding member 5, the inner ring of the bearing 8 is connected to the sliding member 5, and the outer ring of the bearing 8 is connected to the first driving member 7, thereby realizing the rotational connection between the first driving member 7 and the sliding member 5; the crank structure 2 is circular or rod-shaped or long plate-shaped.

[0057] See also Figure 1 and 5 In one embodiment of the present invention, the first driving member 7 includes:

[0058] A pushing member 71, wherein the pushing member 71 is rotatably connected to the sliding member 5;

[0059] The first power source 72 is connected to the pushing member 71 , and the first power source 72 is configured to drive the pushing member 71 to move on the driving shaft 1 .

[0060] It should be noted that the first driving member 7 is an electric telescopic rod or other device that can push the sliding member 5 to move on the driving shaft 1; further, the first power source 72 drives the pushing member 71 to move along the axial direction of the driving shaft 1, so that the pushing member 71 pushes the sliding member 5 to move in the axial direction of the driving shaft 1; wherein, the pushing member 71 is a slide plate; through the drive of the first driving member 7, the trouble of manually adjusting the hinge 3 on the crank structure 2 when the relevant equipment must be shut down is avoided, and the shutdown of the relevant equipment for adjustment is avoided to delay normal use.

[0061] See also Figure 1 In one embodiment of the present invention, one end of the connecting member 6 is hinged to the sliding member 5, and the other end is hinged to the hinge member 3.

[0062] It should be noted that the connecting member 6 is a rod. By hingedly connecting one end of the connecting member 6 to the sliding member 5 and the other end of the connecting member 6 to the hinge 3, the linear movement of the sliding member 5 along the axial direction of the drive shaft 1 can be converted into the radial movement of the hinge 3 along the crank structure 2, thereby meeting the usage requirements.

[0063] See also Figure 1 and 5 , in one embodiment of the present invention, the first power source 72 includes: a mounting frame 721;

[0064] The lead screw 722 is rotatably mounted on the mounting frame 721;

[0065] The first power member 723 is in transmission connection with the lead screw 722 . The first power member 723 is configured to drive the pushing member 71 to move on the mounting bracket 721 through the lead screw 722 .

[0066] It should be noted that the pushing member 71 can slide on the mounting frame 721, and the sliding direction is the same as the axial direction of the drive shaft 1. The first power member 723 is a servo motor or a stepper motor, and the first power member 723 is connected to the screw 722 by a coupling; the first power member 723 drives the pushing member 71 to slide on the mounting frame 721 through the screw 722, thereby driving the sliding member 5 to move through the pushing member 71; through the mutual cooperation of the servo motor, the screw 722, and the pushing member 71, the accuracy of the position adjustment of the hinge 3 on the crank structure 2 can be improved, thereby improving the accuracy of the motion trajectory of the crank-connecting rod mechanism, thereby ensuring the requirements of certain equipment for high-precision crank-connecting rod mechanisms.

[0067] See also Figure 1 and 4 In one embodiment of the present invention, the crank structure 2 is disc-shaped.

[0068] It should be noted that setting the crank structure 2 into a disc shape can make the crank structure 2 rotate more smoothly and avoid large rotation pauses and fluctuations, which is beneficial to improving the performance of the crank device; further, a slide groove 21 is provided on the disc-shaped crank structure 2, and the hinge 3 is slidingly matched in the slide groove 21 to achieve a sliding connection between the hinge 3 and the crank structure 2, and the hinge 3 in this case will not slide out of the crank structure 2.

[0069] See also Figure 1 and 4 In one embodiment of the present invention, the hinges 3 and the connectors 6 are symmetrically arranged in two groups.

[0070] It should be noted that by symmetrically arranging two groups of hinges 3 and connecting members 6, the forces between the sliding member 5, the connecting member 6 and the hinge 3 can be uniform and symmetrical during the movement of the hinge 3 driven by the sliding member 5 through the connecting member 6, thereby reducing the problem of large friction between the sliding member 5 and the drive shaft 1 due to uneven force, thereby causing large wear on the drive shaft 1; at the same time, the symmetrically arranged connecting members 6 and hinges 3 can make the crank structure 2 rotate more smoothly; in addition, when the crank device of the present invention is used as a crank-connecting rod mechanism, the first connecting rod 4 is only hinged to one of the hinges 3.

[0071] See also Figure 3 and 4 In one embodiment of the present invention, a rotation pin 31 is provided on the hinged member 3 , and the connecting member 6 is hinged to the hinged member 3 via the rotation pin 31 .

[0072] It should be noted that the rotating pin 31 can rotate relative to the hinge 3, and the hinge 3 and the connecting member 6 are connected by the rotating pin 31, thereby facilitating the hinge connection between the connecting member 6 and the hinge 3; at the same time, the axial direction of the rotating pin 31 is in the same direction as the axial direction of the drive shaft 1.

[0073] In one embodiment of the present invention, a controller is further included, which is electrically connected to the first driving member 7. The controller controls the amplitude of the movement of the hinge 3 on the crank structure 2 driven by the first driving member 7, thereby improving the degree of automatic control of the crank device.

[0074] In one embodiment of the present invention, two first connecting rods 4 are provided, one end of the two first connecting rods 4 is hinged to the corresponding two hinged parts 3 respectively, and the other ends of the two first connecting rods 4 are hinged to each other, so that the two first connecting rods 4 and the crank structure 2 form a triangle with adjustable angle. When the drive shaft 1 rotates, the triangular structure can be used for stirring, and the positions of the two first connecting rods 4 used for stirring can be adjusted in real time.

[0075] In one embodiment of the present invention, two first connecting rods 4 are provided, one end of the two first connecting rods 4 is hinged to the two hinged parts 3 respectively, and the other ends of the two first connecting rods 4 are connected by a telescopic rod with adjustable length. Driven by the rotation of the drive shaft 1, the two first connecting rods 4 can scrape the side of the barrel with slurry or slurry, and can adapt to scraping the inner wall of the barrel with different diameters.

[0076] See also Figure 6 , the present invention also provides a limb health training device, including the crank device, and further comprising: a second connecting rod 10;

[0077] A third connecting rod 92, one end of the second connecting rod 10 is hinged to the first connecting rod 4, and the other end of the second connecting rod 10 is hinged to the third connecting rod 92 to form a planar connecting rod mechanism;

[0078] a second power source 91, wherein an output end of the second power source 91 is fixedly connected to the other end of the third connecting rod 92, and the second power source 91 is configured to drive the third connecting rod 92 to rotate;

[0079] The training part 11 is provided on the first connecting rod 4 or the second connecting rod 91 .

[0080] It should be noted that the training part 11 is a foot pedal or a handle, and the second power source 91 is a motor or a device that drives rotation; a planar connecting rod mechanism is formed between the crank structure 2, the first connecting rod 4, the second connecting rod 10 and the third connecting rod 92; the limb health training equipment also includes a frame, which is placed on the ground, and the second power source 91 is installed on the frame, and the ends of the second connecting rod 10 and the third connecting rod 92 are hinged to form a revolving pair, and the third connecting rod 92 is fixedly connected to the output shaft of the second power source 91; the second power source 91 can drive the third connecting rod 92 to rotate, and the rotation of the third connecting rod 92 can drive the second connecting rod 10 to swing, thereby changing the position of the hinge between the second connecting rod 10 and the first connecting rod 4, thereby realizing the trajectory adjustment of the training part of the entire limb health training device, and can meet the limb health training needs of users of different heights.

[0081] See also Figure 7 The present invention further provides a limb health training device, comprising the crank device, and further comprising:

[0082] A second driving member 9;

[0083] The second connecting rod 10 has one end hinged to the first connecting rod 4 and the other end hinged to the second driving member 9 to form a hinged portion; the second driving member 9 is configured to be able to drive the hinged portion to move.

[0084] The training part 11 is provided on the first connecting rod 4 or the second connecting rod 10 .

[0085] It should be noted that the training part 11 is a pedal or a handle, and the training part 11 is fixedly connected or hinged to the first connecting rod 4, or the training part 11 is fixedly connected or hinged to the second connecting rod 4, and the crank structure 2, the first connecting rod 4 and the second connecting rod 10 form a planar connecting rod mechanism; the crank structure 2 rotates and drives the first connecting rod 4 to perform a crank-connecting rod movement, and the middle part of the first connecting rod 4 is hinged to the end of the second connecting rod 10 to form a revolving pair. When the first connecting rod 4 performs a crank-connecting rod movement, it swings with the hinge of the first connecting rod 4 and the second connecting rod 10 as the swing center. If the training part 11 is a pedal, the foot The pedal is installed at the end of the first connecting rod 4 away from the crank structure 2, and can be used for rehabilitation training of the lower limbs; according to the different leg lengths of different users, the swing amplitude of the end of the first connecting rod 4 can be adjusted by adjusting the position of the hinge 3 on the crank structure 2; the hinge part is driven to move by the second driving member 9, so that the position of the hinge between the second connecting rod 10 and the first connecting rod 4 can be adjusted, so that the swing center position of the first connecting rod 4 when swinging can be adjusted, and then the swing position of the end of the first connecting rod 4 can also be changed. Through these two aspects of adjustment, the needs of users of different heights for lower limb rehabilitation training can be met.

[0086] See also Figure 8 , the present invention also provides a limb health training device, including the crank device, and further comprising: a first slide rail 12;

[0087] A first slider 13 is slidably disposed on the first slide rail 12; the other end of the first connecting rod 4 is hinged to the first slider 13;

[0088] The training part 11 is disposed on the first sliding block 13 .

[0089] It should be noted that the training part 11 is a foot pedal or a handle, and the limb health training equipment also includes a frame, and the first slide rail 12 and the crank device are both arranged on the frame, and the crank device drives the first connecting rod 4 to move, and the first connecting rod 4 drives the first slider 13 to move linearly on the first slide rail 12; if the training part 11 is a handle, the user holds the handle with both hands, and the handle follows the movement of the first slider 13 and drives the user's upper limbs to perform limb health training; different people have different arm lengths, and thus the movement amplitude of limb health training is different. If the movement trajectory of the handle is not within the appropriate range of the user, the position of the hinge 3 on the crank device can be adjusted to achieve the adjustment of the moving distance and reciprocating frequency of the handle on the first slide rail 12, which can meet the needs of various users.

[0090] In summary, the present invention effectively overcomes some practical problems in the prior art and thus has high utilization value and use significance.

[0091] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A crank device, characterized in that: include: drive shaft; a crank structure, fixedly connected to the drive shaft; A hinged member is slidably disposed on the crank structure along the radial direction of the drive shaft; a first connecting rod, one end of which is hinged to the hinge member; a sliding member, contacting the drive shaft and being movable in the axial direction of the drive shaft, and configured to be able to maintain synchronous rotation with the drive shaft; a connecting member connecting the sliding member and the hinge member, wherein the connecting member is configured to convert movement of the sliding member along the axial direction of the drive shaft into movement of the hinge member along the radial direction of the drive shaft; The first driving member is rotatably connected to the sliding member, and the first driving member is configured to drive the sliding member to move along the axial direction of the driving shaft.

2. The crank device according to claim 1, characterized in that The first driving member includes: a pushing member, the pushing member being rotatably connected to the sliding member; A first power source is connected to the pushing member, and the first power source is configured to drive the pushing member to move on the driving shaft.

3. The crank device according to claim 1, characterized in that One end of the connecting member is hinged to the sliding member, and the other end is hinged to the hinge member.

4. The crank device according to claim 2, characterized in that The first power source includes: Mounting rack; A lead screw is rotatably mounted on the mounting frame; The first power member is connected to the lead screw in a transmission manner. The first power member is configured to drive the pushing member to move on the mounting bracket through the lead screw.

5. The crank device according to claim 1, characterized in that The crank structure is disc-shaped.

6. The crank device according to claim 1, characterized in that The hinges and the connecting members are symmetrically arranged in two groups.

7. The crank device according to claim 1, characterized in that The first driving member and the sliding member are rotatably connected via a bearing.

8. A limb health training device, characterized in that: The crank device according to any one of claims 1 to 7 further comprises: Second connecting rod; a third connecting rod, wherein one end of the second connecting rod is hinged to the first connecting rod, and the other end of the second connecting rod is hinged to the third connecting rod to form a planar connecting rod mechanism; a second power source, wherein an output end of the second power source is fixedly connected to the other end of the third connecting rod, and the second power source is configured to drive the third connecting rod to rotate; The training part is arranged on the first connecting rod or the second connecting rod.

9. A limb health training device, characterized in that: The crank device according to any one of claims 1 to 7 further comprises: a second driving member; a second connecting rod, one end of which is hinged to the first connecting rod, and the other end of which is hinged to the second driving member to form a hinged portion; The second driving member is configured to drive the hinge portion to move; The training part is arranged on the first connecting rod or the second connecting rod.

10. A limb health training device, characterized in that: The crank device according to any one of claims 1 to 7 further comprises: First slide rail; a first sliding block, slidably disposed on the first sliding rail; the other end of the first connecting rod is hinged to the first sliding block; The training part is arranged on the first slider or the first connecting rod.

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