A fitness equipment

Abstract

The present application is a fitness equipment in the field of fitness equipment, which includes a base fixed on the ground, two support beams are vertically arranged above the base, a bracket for lifting a human body is hinged on the same side of the two support beams, a counterweight mechanism is arranged on the bracket along the direction away from the hinge of the bracket and the support beam; the counterweight mechanism includes a slide rail fixed on the bracket and arranged along the direction away from the hinge of the bracket and the support beam, a counterweight block is arranged on the slide rail, a slider connected to the slide rail is fixed on the counterweight block, and a pair of limit mechanisms are arranged on the counterweight block to limit the sliding position of the slider on the slide rail. The present application has the effect of quickly adjusting the weight of the load.

Description

Technical Field

[0001] The present application relates to the field of fitness equipment, and in particular to a fitness equipment. Background Art

[0002] Fitness equipment is a kind of sports equipment used by people who have fitness needs to assist in exercise and strengthen their bodies. There are different equipment for different effects.

[0003] In the gym, when people train their leg muscles, they often squat with a barbell on their shoulders. However, when adjusting the weight of the barbell, they need to reciprocate to install and remove the barbell plates, which is not only difficult to operate, but also consumes a lot of physical energy. Summary of the invention

[0004] In view of the shortcomings of the prior art, the object of the present invention is to provide a fitness device, which has the advantage of being able to quickly adjust the weight.

[0005] The present application provides a fitness device that adopts the following technical solution:

[0006] A fitness equipment, comprising a base fixed on the ground, two support beams erected on the base, a bracket for lifting a human body hingedly connected to the same side of the two support beams, and a counterweight mechanism arranged on the bracket away from the hinge direction of the bracket and the support beam;

[0007] The counterweight mechanism includes a slide rail fixed on the bracket and arranged in a direction away from the hinge of the bracket and the support beam, a counterweight block is arranged on the slide rail, a slider slidably connected to the slide rail is fixed on the counterweight block, and a pair of limiting mechanisms are arranged on the counterweight block to limit the sliding position of the slider on the slide rail.

[0008] By adopting the above technical solution, when exercising, a person can lift the bracket with his arms, and overcome the weight of the bracket and the weight of the counterweight mechanism, thereby achieving the purpose of arm exercise; a person can also carry the bracket on his shoulders and train his legs by bending his legs. As the counterweight moves away from the hinge point, the torque becomes larger and larger, and the work done by the human body to lift the bracket also becomes larger and larger, thereby achieving the purpose of adjusting the counterweight. The staff only needs to adjust the counterweight by sliding and locking the counterweight, which not only does not need to bear the weight of the counterweight, but also facilitates the staff to operate quickly, greatly improving the staff's operating efficiency.

[0009] Preferably, a chamber is provided in the counterweight block, and the limiting mechanism includes a limiting rod arranged in the chamber and slidably connected to the counterweight block in the direction of the slide rail, the upper and lower ends of the limiting rod respectively penetrate the upper and lower inner walls of the counterweight block, and a limiting plate is fixedly connected to the circumferential surface of the limiting rod, and the limiting plate is located in the chamber of the counterweight block. A compression spring is also sleeved on the limiting rod, and the compression spring is located between the limiting plate and the top wall of the counterweight block; the upper surface of the slide rail is evenly provided with a plurality of sockets for accommodating the lower end of the limiting rod to be inserted along the length direction of the slide rail.

[0010] By adopting the above technical solution, when the staff slides the counterweight block, they first grab the end of the limit rod and lift the limit rod, thereby causing the limit plate to move toward the top wall of the counterweight block and elastically compress the compression spring. When the lower end of the limit rod moves to a position corresponding to the socket, the lower end of the limit rod is stably inserted in the socket under the elastic action of the compression spring, thereby limiting the mutual sliding of the slider and the slide rail, so that the slider can be stably maintained at the position corresponding to the slide rail during the lifting process of the bracket.

[0011] Preferably, a support beam is also provided on the base to provide auxiliary support to the bracket.

[0012] By adopting the above technical solution, the support beam plays an auxiliary supporting role for the bracket, so that the part of the bracket that contacts the human body is away from the ground. When the human body operates the bracket, the physical exertion caused by lifting the bracket from the bottom can be saved. Moreover, when the staff finishes operating the bracket, the setting of the support beam also reduces the return stroke of the bracket, reducing the safety hazard caused by the human body separating from the bracket and falling directly to the ground.

[0013] Preferably, each end portion of the slide rail is fixedly connected with an anti-detachment sheet for limiting the detachment of the sliding block from the slide rail.

[0014] By adopting the above technical solution, the anti-drop sheet is arranged at the end of the slide rail, so that even if the limit rod is separated from the socket, the slider will not be separated from the end of the slide rail, thereby improving the safety of the fitness equipment.

[0015] Preferably, the upper end of the limiting rod is connected to a mounting cap for driving the limiting rod to slide.

[0016] By adopting the above technical solution, the provision of the mounting cap increases the direct contact area between the hand and the limit rod, thereby improving the operational efficiency of lifting the limit rod.

[0017] Preferably, the limiting mechanism includes a rack fixed on the slide rail along the length direction of the slide rail, an installation cavity is provided in the slide rail, a rotating shaft is arranged in the installation cavity, a driven gear is coaxially fixed to the rotating shaft, a connecting groove for the driven gear and the rack to mesh with each other is provided on one side of the installation cavity, a limiting groove for accommodating the rotating shaft is provided on the lower surface of the installation cavity, a supporting spring for supporting the rotating shaft is provided in the limiting groove, a plurality of limiting protrusions are fixedly connected to the side of the driven gear facing the limiting groove, a matching groove for accommodating the limiting protrusion is provided on the bottom wall of the installation cavity, and a driving mechanism for driving the rotating shaft to move into the limiting groove and making the limiting protrusion and the matching groove mutually engaged is provided in the counterweight block; when the limiting protrusion and the matching groove are engaged with each other, the driven gear and the rack remain in a meshing state.

[0018] By adopting the above technical scheme, when the counterweight block and the slide rail slide against each other, the driven gear and the rack will be meshed with each other. If the staff wants to position the counterweight block at the position of the slide rail, the driving mechanism can be used to press down the rotating shaft, so that the supporting spring can be elastically expanded and contracted, and the side of the driven gear facing the bottom wall of the installation cavity is in contact with the bottom wall of the installation cavity, and the limiting protrusion on the driven gear is matched with the matching groove of the bottom wall of the installation cavity, thereby limiting the free rotation of the driven gear. Although the driven gear moves a certain distance when the limiting protrusion and the matching groove cooperate with each other, the rack and the driven gear are still meshed with each other, and the inability of the driven gear to rotate also limits the continuous sliding of the slider and the slide rail.

[0019] Preferably, the driving mechanism includes a rotating roller rotatably connected to the counterweight block, the axis of the rotating roller and the axis of the limiting rod are perpendicular to each other, the upper end of the limiting rod is always in contact with the outer circumference of the rotating roller, and the outer circumference of the rotating roller is provided with a section along the axial direction of the rotating roller to accommodate the upper end of the rotating shaft so that the supporting spring maintains a natural state, and one end of the rotating roller is provided with a driving component for driving the rotating roller to rotate.

[0020] By adopting the above technical solution, in the initial state, the upper end of the rotating shaft is located in the section of the rotating roller. When the counterweight moves to the position to be fixed, the staff drives the rotating roller to rotate through the driving assembly, so that the upper end of the rotating shaft is guided by the inner wall of the section and contacts the outer peripheral surface of the rotating roller, thereby driving the rotating shaft to move in the direction of the limiting groove, and realizing the mutual alignment of the limiting protrusion and the matching groove. In addition, the rotating roller is arranged in the counterweight and has a certain weight. It will not only not reduce the overall weight of the counterweight, but also has a transmission function. The structure is simple, which greatly improves the efficiency of manual operation.

[0021] Preferably, the driving assembly includes a transmission gear coaxially arranged at one end of the rotating roller, a driving gear meshing with the transmission gear, a turntable fixedly connected to one side of the driving gear, the turntable is rotatably connected to the counterweight block, and a handle is fixedly connected to the side of the turntable away from the driving gear.

[0022] By adopting the above technical solution, when the staff moves the counterweight block, they can move the counterweight block by supporting it with the handle. Then, when positioning the counterweight block, the handle can be used to drive the turntable to rotate, and the meshing transmission of the driving gear and the transmission gear can be used to drive the rotating roller to rotate. The structure is simple, the operation efficiency is high, and it is easy to maintain.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. Improved the convenience of counterweight adjustment; the staff only needs to adjust the torque by sliding the counterweight block and the slide rail, thereby achieving the purpose of adjusting the counterweight, which greatly improves the operating efficiency of the staff;

[0025] 2. It is convenient to adjust and lock the position of the counterweight block; the relative sliding of the slider and the slide rail is limited by the plug-in cooperation between the limit rod and the plug hole, thereby improving the stability of the counterweight block fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the overall structure of the fitness equipment in Example 1;

[0027] Figure 2 is a schematic structural diagram of the contact assembly in Example 1;

[0028] Figure 3 is a schematic diagram of the overall structure of the counterweight mechanism in Example 1;

[0029] Figure 4 is a cross-sectional view of the limiting mechanism in Embodiment 1;

[0030] Figure 5 is a schematic structural diagram of the counterweight mechanism in Embodiment 2;

[0031] Figure 6 This is a schematic diagram of the internal structure of the slider installation cavity in Embodiment 2;

[0032] Figure 7 It is a schematic diagram showing the positional relationship between the driving mechanism and the rotating shaft;

[0033] Figure 8 yes Figure 7 The enlarged detail of point A in the middle shows the positioning structure between the driven gear and the bottom wall of the mounting cavity;

[0034] Fig. 9It is a schematic diagram showing the relationship between the limiting protrusion and the matching groove;

[0035] Fig.10 It is a schematic diagram showing the internal structure of the shell.

[0036] Description of reference numerals: 11, base; 12, support plate; 13, support beam; 14, support oblique beam; 15, connecting rod; 2, bracket; 21, extension beam; 22, lifting beam; 3, contact assembly; 31, oblique support rod; 32, shoulder support roller; 33, lifting rod; 4, support assembly; 41, support beam; 42, rubber pad; 5, counterweight mechanism; 51, slide rail; 511, jack; 52, slider; 521, installation cavity; 522, connecting groove; 523, limit groove; 524, matching groove; 53, counterweight block; 5 31. Shell; 532. Counterweight unit; 533. Make way groove; 56. Chamber; 54. Handrail; 55. Anti-drop plate; 6. Limiting mechanism; 61. Limiting rod; 62. Closing plate; 63. Limiting plate; 64. Compression spring; 65. Mounting cap; 66. Rack; 67. Rotating shaft; 68. Support spring; 69. Driven gear; 60. Limiting protrusion; 7. Driving mechanism; 71. Rotating roller; 711. Section; 8. Driving assembly; 81. Transmission gear; 82. Driving gear; 83. Turntable; 84. Handle. DETAILED DESCRIPTION

[0037] The present application is further described in detail below in conjunction with all the drawings.

[0038] Embodiment 1: A fitness device, such as Figure 1 As shown, it includes a base 11, which is a rectangular frame; a support plate 12 for supporting a human body is laid on the upper surface of the base 11, and the support plate 12 and the base 11 are fixedly connected to each other; two support beams 13 are vertically arranged at the rear of the base 11, and the support beams 13 are located on both sides of the base 11 and are fixedly connected to the base 11; a bracket 2 is hingedly connected to the upper part of the two support beams 13 toward the front of the base 11, and a contact component 3 for contacting and supporting a human body is arranged on the side of the bracket 2 away from the support beam 13; a support component 4 fixed on the support plate 12 for supporting the bracket 2 in a horizontal state is arranged below the bracket 2.

[0039] like Figure 1As shown, each support beam 13 is provided with a support inclined beam 14 toward the front side of the base 11, one end of the support inclined beam 14 is fixedly connected to the support beam 13, and the other end of the support inclined beam 14 is fixedly connected to the upper surface of the base 11, so that a stable triangular support structure is formed between the base 11, the support inclined beam 14, and the support beam 13, thereby improving the stability of the vertical setting of the support beam 13. A connecting rod 15 is also provided between the two support rods, and the support rod is provided close to the upper end of the support beam 13. The two ends of the connecting rod 15 are respectively fixedly connected to the corresponding support beam 13, so that it is not easy for the support beam 13 to shake, thereby improving the safety of the fitness equipment.

[0040] like Figure 1 As shown, the bracket includes two parallel extended beams 21, and a lifting beam 22 arranged at the same end of the two extended beams 21, the connection between the extended beams 21 and the lifting beams 22 is welded to each other, the end of the extended beam 21 away from the lifting beam 22 is hinged to one side of the corresponding support beam 13, and the hinge axis between the extended beam 21 and the support beam 13 is parallel to the plane where the support plate 12 is located.

[0041] like Figure 1 As shown, the support assembly 4 includes two joists 41 vertically fixed on the support plate 12, the joists 41 are located directly below the lifting beam 22 and fixed on both sides of the support plate 12, and a rubber pad 42 is attached to the upper surface of each joist 41, thereby replacing the direct contact between the joist 41 and the lifting beam 22, reducing the wear caused by the joist 41 directly supporting the lifting beam 22. Moreover, when the lifting beam 22 is supported on the joist 41, the bracket 2 is in a horizontal state.

[0042] like Figure 1 and Figure 2 As shown, the contact assembly 3 includes two parallel diagonal bracing rods 31, one end of which is fixedly connected to the lifting beam 22, and the other end of the diagonal bracing rod 31 extends obliquely in a direction away from the base 11, and a gap is left between the two diagonal bracing rods 31; each diagonal bracing beam is also horizontally fixedly connected to a shoulder support roller 32 at the end, and a lifting rod 33 is fixedly connected to the two diagonal bracing rods 31. When the staff is doing leg exercise, they place their head between the two shoulder support rollers 32, and then lean their shoulders against the bottom of the shoulder support rollers 32, and lift the lifting beam 22 by bending their legs, and drive the extension beam 21 and the support beam 13 to be hinged to each other. The weight of the bracket 2 is used to bear the burden on the human body, so as to achieve the purpose of exercise. When the staff is exercising the upper limbs, they also carry the two shoulder support rollers 32 on their shoulders, and then hold the lifting rod 33 with their hands to lift the lifting beam 22, and the weight of the bracket 2 is used to bear the burden on the arms, so as to achieve the effect of arm exercise.

[0043] like Figure 1 and Figure 3As shown, a counterweight mechanism 5 is also provided on the upper surface of each extension beam 21. The counterweight mechanism 5 includes a slide rail 51 fixedly connected to the upper surface of the extension beam 21 along the length direction of the extension beam 21, a slider 52 is slidably connected to the slide rail 51, a counterweight block 53 is fixedly connected to the upper surface of the slider 52, and a handrail 54 is fixedly connected to each side of the counterweight block 53 in the moving direction, so as to facilitate the control of the counterweight block 53 to slide on the slide rail 51, and a pair of limiting mechanisms 6 for fixing the sliding position of the slider 52 are also provided on the counterweight block 53.

[0044] like Figure 4 As shown, a cylindrical chamber 56 is provided inside the counterweight 53, the axis of the chamber 56 is perpendicular to the center of the slide rail 51, and the upper part of the chamber 56 is provided with an opening. The above-mentioned limiting mechanism 6 includes a limiting rod 61 coaxially provided in the chamber 56, the lower end of the limiting rod 61 penetrates the counterweight 53 and points to the upper surface of the slide rail 51, and the upper end of the limiting rod 61 is higher than the upper surface of the counterweight 53; the counterweight 53 is provided with an annular sealing plate 62 above the opening of the chamber 56, and the sealing plate 62 is fixed to the edge of the opening of the chamber 56 by a plurality of bolts, and the upper end of the above-mentioned limiting rod 61 passes through the sealing plate 62 and slides with the sealing plate 62. The limiting rod 61 is coaxially fixed with an annular limiting plate 63 on its circumferential surface, and the limiting plate 63 is located in the chamber 56; the limiting rod 61 is also sleeved with a compression spring 64, the upper end of the compression spring 64 abuts against the lower surface of the sealing plate 62, and the lower end of the compression spring 64 abuts against the upper surface of the limiting rod 61; and the upper surface of the slide rail 51 is evenly provided with a plurality of insertion holes 511 for accommodating the lower end of the limiting rod 61 along the length direction of the slide rail 51.

[0045] The upper end of the limit rod 61 is also threadedly connected with a mounting cap 65, and the longitudinal section of the mounting cap 65 is T-shaped, thereby increasing the gripping area of ​​the hand and the limit rod 61, and improving the convenience of operating the limit rod 61. When the staff needs to adjust the counterweight, the staff can move the counterweight block 53 in the direction of the hinge between the extension beam 21 and the support beam 13, so that the center of gravity of the counterweight block 53 is close to the support beam 13, the torque is small, and the burden on the staff to lift the lifting beam 22 is relatively small; the staff can also move the counterweight block 53 in the direction of the lifting beam 22, so that the center of the counterweight block 53 is close to the side of the staff, thereby increasing the torque, so that the staff needs to overcome the pressure applied by the counterweight block 53 while handling the customer support bracket 2, thereby improving the exercise effect. The staff only needs to hold the limit rod 61 to lift the limit rod 61, which drives the compression spring 64 to compress elastically. When the counterweight 53 moves to the corresponding position, the limit rod 61 is tightly inserted into the insertion hole 511 under the elastic action of the compression spring 64, thereby limiting the relative sliding of the slider 52 and the slide rail 51. In addition, when the bracket 2 is in a horizontal state, the staff has less resistance to the sliding of the counterweight 53, thereby improving the convenience of moving the counterweight 53.

[0046] like Figure 3 As shown, anti-slip plates 55 are also provided at both ends of each slide rail 51. The anti-slip plates 55 are fixed to the upper surface of the extension beam 21, and the size of the anti-slip plates 55 is larger than the cross-sectional size of the slide rail 51, thereby limiting the separation of the slider 52 from the end of the slide rail 51 and improving the safety of the fitness equipment during use.

[0047] Embodiment 2: A fitness device, which is different from Embodiment 1 in that Figure 5 and Figure 6 As shown, a mounting cavity 521 is provided on the upper surface of the slider 52 along the height direction of the slider 52 , and the mounting cavity 521 is provided at one side of the slide rail 51 . The limiting mechanism 6 includes a rack 66 fixedly connected to the side of the slide rail 51 facing the installation cavity 521, and the length of the rack 66 is the same as that of the slide rail 51; a connecting groove 522 for accommodating the rack 66 and communicating with the installation cavity 521 is provided on one side of the slider 52, so that when the slider 52 and the slide rail 51 slide against each other, the rack 66 will not interfere with the slider 52; a rotating shaft 67 is vertically arranged in the installation cavity 521 along the height direction of the installation cavity 521, and a limiting groove 523 for accommodating the lower end of the rotating shaft 67 is provided on the bottom surface of the installation cavity 521, and a pair of supporting springs 68 for supporting the rotating shaft 67 are placed in the limiting groove 523; a driven gear 69 is coaxially fixedly connected to the rotating shaft 67, and in the initial state, the rotating shaft 67 is supported by the supporting spring 68, so that a gap is left between the driven gear 69 and the bottom surface of the installation cavity 521, and the driven gear 69 and the rack 66 are meshed with each other. When the slider 52 and the slide rail 51 slide relative to each other, the driven gear 69 is driven to freely rotate around the axis of the rotating shaft 67 through the mutual meshing of the rack 66 and the driven gear 69 .

[0048] like Figure 7 and Figure 8 As shown, six hemispherical limiting protrusions 60 are evenly fixed to the lower surface of the driven gear 69 with the center of the driven gear 69 as the center of the circle, and matching grooves 524 for accommodating the limiting protrusions 60 are provided at positions corresponding to the six limiting protrusions 60 on the bottom surface of the mounting cavity 521, and a driving mechanism 7 is also provided in the counterweight block 53 to drive the rotating shaft 67 to move downward so that the limiting protrusions 60 are inserted into the corresponding matching grooves 524, thereby limiting the rotation of the driven gear 69.

[0049] like Figure 7As shown, the counterweight block 53 includes a housing 531 and a counterweight unit 532 inserted into the housing 531. The upper end of the rotating shaft 67 penetrates into the housing 531 and is slidably connected to the housing 531. The driving mechanism 7 includes a rotating roller 71 arranged in the housing 531 and rotatably connected to the inner wall of the housing 531. The rotating roller 71 is located directly above the rotating shaft 67, and the upper end surface of the rotating shaft 67 always contacts the outer peripheral surface of the rotating roller 71, and the extension line of the axis of the rotating shaft 67 is perpendicular to and interferes with the axis of the rotating roller 71. The circumference of the rotating roller 71 is provided with a cut surface 711 along the length direction of the rotating roller 71, thereby reducing the local radius of the rotating roller 71, and when the rotating shaft 67 is in the initial state, the upper end of the rotating shaft 67 contacts the cut surface 711 area of ​​the rotating roller 71, so that the support spring 68 is in a natural state.

[0050] like Figure 5 and Fig.10 As shown, a driving assembly 8 for driving the rotating roller 71 to rotate is also provided at one end of the rotating roller 71. The driving assembly 8 includes a transmission gear 81 coaxially fixed to one end of the rotating roller 71, a driving gear 82 meshing with the transmission gear 81 is rotatably connected to the side wall of the housing 531 against which the transmission gear 81 is abutted, a rotating disk 83 coaxially fixed to the driving gear 82 is provided on the outer wall of the housing 531, and the rotating disk 83 is rotatably connected to the outer wall of the housing 531; a handle 84 is also fixed to the side of the rotating disk 83 away from the driving gear 82, so that the staff can drive the rotating disk 83 to rotate through the handle 84, and the rotating roller 71 is rotated through the meshing transmission of the driving gear 82 and the transmission gear 81. A clearance groove 533 is provided on the lower surface of the counterweight unit 532 at the position where it interferes with the rotating roller 71 and the driving assembly 8, so that after the counterweight unit 532 and the shell 531 are plugged into each other, the normal operation of the driving mechanism 7 will not be affected. In addition, the staff can also maintain the driving mechanism 7 by disassembling the counterweight unit 532, thereby improving the maintenance efficiency.

[0051] like Figure 8 and Fig. 9As shown, when the staff uses the counterweight 53, they can hold the handle 84 and drive the counterweight 53 to slide on the slide rail 51. At this time, the driven gear 69 rotates freely in the installation cavity 521 under the mutual engagement with the rack 66. When the staff needs to fix the relative position of the slider 52 and the slide rail 51, the staff can rotate the handle 84 to drive the turntable 83 to rotate, and drive the rotating roller 71 to rotate through the mutual engagement of the driving gear 82 and the transmission gear 81. When the rotating shaft 67 is in the initial state, the upper end of the rotating shaft 67 is located at the section 711 of the rotating roller 71. As the rotating roller 71 rotates, the rotating shaft 67 is limited by the limiting groove 523 and moves toward the bottom of the limiting groove 523, driving the support spring 68 to be elastically compressed. At the same time, the limiting protrusion 60 on the lower surface of the driven gear 69 is stuck in the corresponding matching groove 524, thereby limiting the free rotation of the driven gear 69. At this time, the driven gear 69 also maintains a state of mutual meshing with the rack 66, thereby limiting the relative sliding of the slider 52 and the slide rail 51. The staff only needs to operate the handle 84 to achieve the fixation of the relative position of the counterweight 53 on the slide rail 51, which is simple to operate and has significant effects.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fitness device, characterized in that: It comprises a base (11) fixed on the ground, two support beams (13) are vertically arranged above the base (11), a bracket (2) for lifting a human body is hingedly connected to the same side of the two support beams (13), and a counterweight mechanism (5) is arranged on the bracket (2) away from the hinge direction of the bracket (2) and the support beam (13); The counterweight mechanism (5) comprises a slide rail (51) fixed on the bracket (2) and arranged in a direction away from the hinged connection between the bracket (2) and the support beam (13); a counterweight block (53) is arranged on the slide rail (51); a slider (52) is fixedly connected to the counterweight block (53) and is slidably connected to the slide rail (51); and a pair of limiting mechanisms (6) are arranged on the counterweight block (53) for limiting the sliding position of the slider (52) on the slide rail (51); The base (11) is also provided with a supporting beam (41) for auxiliary support of the bracket (2); The limiting mechanism (6) comprises a rack (66) fixed on the slide rail (51) along the length direction of the slide rail (51); a mounting cavity (521) is provided in the slide rail (51); a rotating shaft (67) is provided in the mounting cavity (521); a driven gear (69) is coaxially fixedly connected to the rotating shaft (67); a connecting groove (522) for the driven gear (69) and the rack (66) to mesh with each other is provided on one side of the mounting cavity (521); a limiting groove (523) for accommodating the rotating shaft (67) is provided on the lower surface of the mounting cavity (521); a supporting member (523) is provided in the limiting groove (523) The support spring (68) of the shaft (67), the driven gear (69) is fixedly connected with a plurality of limiting protrusions (60) on one side facing the limiting groove (523), a matching groove (524) for accommodating the limiting protrusion (60) is provided on the bottom wall of the installation cavity (521), and a driving mechanism (7) is provided in the counterweight block (53) for driving the rotating shaft (67) to move into the limiting groove (523) and making the limiting protrusion (60) and the matching groove (524) mutually engaged; when the limiting protrusion (60) and the matching groove (524) are mutually engaged, the driven gear (69) and the rack (66) maintain a meshing state; The driving mechanism (7) comprises a rotating roller (71) rotatably connected to the counterweight (53); the axis of the rotating roller (71) is perpendicular to the axis of the limiting rod (61); the upper end of the limiting rod (61) always contacts the outer peripheral surface of the rotating roller (71); the outer peripheral surface of the rotating roller (71) is provided with a section (711) along the axial direction of the rotating roller (71) for accommodating the upper end of the rotating shaft (67) so that the supporting spring (68) maintains a natural state; one end of the rotating roller (71) is provided with a driving component (8) for driving the rotating roller (71) to rotate.

2. A fitness device according to claim 1, characterized in that: A chamber (56) is arranged in the counterweight block (53), and the limiting mechanism (6) comprises a limiting rod (61) arranged in the chamber (56) and connected to the counterweight block (53) in a sliding manner in the direction of the slide rail (51). The upper and lower ends of the limiting rod (61) respectively penetrate the upper and lower inner walls of the counterweight block (53). A limiting plate (63) is fixedly connected to the circumferential surface of the limiting rod (61), and the limiting plate (63) is located in the chamber (56) of the counterweight block (53). A compression spring (64) is also sleeved on the limiting rod (61), and the compression spring (64) is located between the limiting plate (63) and the top wall of the counterweight block (53). The upper surface of the slide rail (51) is evenly provided with a plurality of insertion holes (511) for accommodating the lower end of the limiting rod (61) to be inserted and clamped along the length direction of the slide rail (51).

3. A fitness device according to claim 1, characterized in that: The two ends of the slide rail (51) are each fixedly connected with an anti-slip sheet (55) for limiting the sliding block (52) from being detached from the slide rail (51).

4. A fitness device according to claim 2, characterized in that: The upper end of the limiting rod (61) is connected to a mounting cap (65) for driving the limiting rod (61) to slide.

5. A fitness device according to claim 1, characterized in that: The driving assembly (8) comprises a transmission gear (81) coaxially arranged at one end of the rotating roller (71), a driving gear (82) meshing with the transmission gear (81), a rotating disk (83) fixedly connected to one side of the driving gear (82), the rotating disk (83) being rotatably connected to the counterweight (53), and a handle (84) fixedly connected to the side of the rotating disk (83) facing away from the driving gear (82).

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