Arm adjustment system and intelligent personal fitness device

Abstract

The present invention discloses an arm adjustment system, which includes a lifting mechanism, a vertical pitching mechanism, and a horizontal rotation mechanism; the lifting mechanism includes a guide rail, a sliding assembly, and a lifting locking assembly, the sliding assembly is slidably installed in the guide rail and is locked in the guide rail by the lifting locking assembly; the sliding assembly includes a slider, a spring piece, and a pulley, the slider is located in the guide rail, the spring piece is clamped on the slider, and the pulley is located at both ends of the spring piece; the vertical pitching mechanism includes a rotating end at one end of the arm and a pitching locking assembly, the rotating end of the arm is rotatably installed on the sliding assembly and is locked in the rotating position by the pitching locking assembly; the horizontal rotation mechanism includes a rotating assembly and a rotation locking assembly located on the guide rail, the rotating assembly of the guide rail is rotatably installed on the box body of the fitness device and is locked in the rotating position by the rotation locking assembly. The present invention has the advantages of simple structure, smooth sliding, and no clearance in rotation, etc.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of fitness equipment, and in particular to an arm adjustment system and an intelligent personal fitness device. Background Art

[0002] With the development of social economy and the improvement of people's living standards, more and more people pay attention to health and participate in fitness. However, urban congestion and fast-paced life increase the time cost of going to the gym.

[0003] At present, there are many kinds of fitness equipment on the market with different functions. Among them, tension fitness is relatively simple, so it has been effectively popularized. However, traditional tension fitness equipment with adjustable tension is very bulky, occupies a large area, and the overall structure of the adjustment device corresponding to the mechanical arm is complex, occupies a large volume, and is complicated to operate, making it very inconvenient for people to exercise.

[0004] The applicant of this patent has previously designed a multifunctional wall-mounted pulling fitness system, but found that there are still many problems in the subsequent use process: 1. When the slider of the robotic arm slides in the guide rail, the movement is not smooth and there will be jamming; 2. There is a large gap between the robotic arm and the guide rail, and there is a large shake, especially when rotating horizontally, the existing gap has affected the user's use; 3. When the robotic arm has been locked in the up and down pitch, the robotic arm may still be able to pitch up and down.

[0005] Through in-depth analysis of the above problems, the applicant of this patent has summarized the deep-seated reasons for the above technical problems: 1. In the original up and down sliding structure, the angle of the spring steel sheet on which the pulley is installed is difficult to control, and it is impossible to ensure that the pulleys in the up and down directions are on the same vertical line, which will cause the slider to deviate to one side, and then cause the slider to contact the guide rail during the sliding process, and the movement of the slider in the guide rail is not smooth, and there will be a jam. In addition, the original spring steel sheet is fixed by screws. During the test, it was found that the screws are easy to loosen, which will also cause the spring steel sheet to deviate to one side, resulting in an unsmooth sliding process; 2. The original horizontal rotation mechanism has a large and inevitable gap due to the processing accuracy that does not meet the requirements and the relatively complex structure, which affects the user's use; 3. After the original lock block is locked, the lock block is in a free-moving state. When the mechanical arm strength reaches a certain level or other abnormal conditions, the lock block will be separated from the rotating end, so that the mechanical arm can still move freely, and the safety of operator training cannot be guaranteed. Summary of the invention

[0006] The technical problem to be solved by the present invention is: in view of the technical problems existing in the prior art, the present invention provides an arm adjustment system and an intelligent personal fitness device with simple structure and smooth sliding.

[0007] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0008] An arm adjustment system includes a lifting mechanism, an up-and-down pitching mechanism, and a horizontal rotation mechanism;

[0009] The lifting mechanism comprises a guide rail, a sliding assembly and a lifting locking assembly, wherein the sliding assembly is slidably installed in the guide rail and locked in the guide rail by the lifting locking assembly; the sliding assembly comprises a slider, a spring sheet and a pulley, wherein the slider is located in the guide rail, the spring sheet is clamped on the slider, and the pulley is located at both ends of the spring sheet for sliding guidance;

[0010] The up-down pitch mechanism comprises a rotating end and a pitch locking assembly located at one end of the arm, wherein the rotating end of the arm is rotatably mounted on the sliding assembly and the rotation position is locked by the pitch locking assembly; wherein the rotation direction of the rotating end is the up-down pitch direction;

[0011] The horizontal rotation mechanism includes a rotation component and a rotation locking component located on the guide rail. The rotation component of the guide rail is rotatably mounted on the box of the fitness equipment and the rotation position is locked by the rotation locking component. The rotation direction of the rotation component is horizontal rotation.

[0012] As a further improvement of the above technical solution:

[0013] The spring sheet is installed on the sliding block by interference fit.

[0014] Both ends of the slider are provided with limiting components, and the spring sheet is limited on the slider by the limiting components.

[0015] The specific structure of the pitch locking assembly includes a locking tooth on the rotating end, a mounting block, a rotating switch handle, a connecting block, a connecting rod and a locking block, wherein a pair of bearing bases are provided on the mounting block, and one end of the connecting block is rotatably mounted on the bearing base, wherein the rotating switch handle is connected to one end of the connecting block, the other end of the connecting block is hinged to one end of the connecting rod, the other end of the connecting rod is connected to one end of the locking block, and the other end of the locking block is provided with a locking groove matching the locking tooth.

[0016] The mounting block is also provided with a self-locking component for pressing the locking block onto the rotating end.

[0017] The self-locking assembly includes two blocking blocks, which are rotatably mounted on both sides of the mounting block, wherein a torsion spring is provided on the rotating shaft at the rotating end of the blocking block, so that the movable ends of the two blocking blocks are close to each other to resist the top of the locking block.

[0018] The rotating assembly includes a fixed disk, a mounting plate and a fixed seat. The fixed disk is tightly connected to the guide rail. The mounting plate is fastened to the box body of the fitness device. The fixed seat is fastened to the mounting plate. The fixed disk and the fixed seat are located on both sides of the mounting plate and are connected by a bearing.

[0019] A damping assembly is arranged on the circumferential side of the fixed disk. The damping assembly includes a fixed plate, a spring, a damping bracket and an external thread bearing. The fixed plate is fastened to the mounting plate. One end of the spring is mounted on the fixed plate. The damping bracket is rotatably mounted on the fixed plate. One end of the damping bracket abuts against the other end of the spring. The external thread bearing is located at the other end of the damping bracket. A damping groove matching the external thread bearing is arranged on the circumferential side of the fixed disk.

[0020] The rotation locking assembly includes a support frame, an electromagnet and a bolt. The support frame is mounted on the mounting plate. The electromagnet is mounted on the support frame. The electromagnet is movably connected to one end of the bolt. After the other end of the bolt passes through the fixing hole of the mounting plate, it extends into the positioning hole on the fixed disk to achieve rotation locking.

[0021] The present invention also discloses an intelligent personal fitness device, which includes a box body. Arms are arranged on both sides of the box body. The arm adjustment system as described above is further included.

[0022] Compared with the prior art, the advantages of the present invention are as follows:

[0023] In the arm adjustment system of the present invention, the up-and-down lifting movement of the arm is realized through the lifting mechanism and the lifting position is locked by the lifting locking assembly. The up-and-down pitching movement of the arm is realized through the up-and-down pitching mechanism and the up-and-down pitching position is locked by the pitching locking assembly. The horizontal rotation of the arm is realized through the horizontal rotation mechanism and the horizontal rotation direction is locked by the rotation locking assembly, so as to finally realize the adjustment of the arm in three directions. In the above-mentioned lifting mechanism, the upper and lower pulleys are installed on the slider through the same spring piece, so that the upper and lower pulleys can be ensured to be on the same vertical line. Through the above setting, the four wheels in the up, down, left and right directions are on the same plane and maintain a pairwise symmetric relationship. At this time, the slider is supported by the spring piece and does not contact the guide rail, so the sliding process is very smooth. Moreover, the above overall structure is simple, the operation is convenient and it is easy to implement. The present invention ensures no gap when the arm is fixed through the mutual cooperation of the fixed disk and the bolt, and makes the overall force-bearing effect of the fixed disk meet the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the fitness device of the present invention in the embodiment.

[0025] Figure 2 It is a schematic structural diagram of the sliding assembly of the present invention in the embodiment.

[0026] Figure 3 This is a three-dimensional structure diagram of the sliding component of the present invention in an embodiment.

[0027] Figure 4 This is a structure diagram of the lifting and locking component of the present invention in an embodiment.

[0028] Figure 5 This is a schematic diagram of the up-and-down pitching movement of the arm of the present invention.

[0029] Figure 6 This is a schematic structural diagram of the up-and-down pitching mechanism of the present invention in an embodiment.

[0030] Figure 7 This is a schematic structural diagram of the up-and-down pitching mechanism of the present invention in an embodiment (removing the locking block).

[0031] Figure 8 This is one of the schematic structural diagrams of the horizontal rotation mechanism of the present invention in an embodiment.

[0032] Figure 9 This is another schematic structural diagram of the horizontal rotation mechanism of the present invention in an embodiment.

[0033] Legend Explanation: 1. Box body; 2. Arm; 3. Lifting mechanism; 31. Guide rail; 32. Sliding component; 321. Slide block; 322. Pulley; 323. Spring piece; 324. Roller; 33. Limit component; 34. Lifting and locking component; 341. Rotating link; 342. Rotating switch handle; 343. Index pin; 344. Locking sleeve; 4. Up-and-down pitching mechanism; 41. Rotating end; 42. Pitching locking component; 421. Locking tooth; 422. Mounting block; 423. Rotating switch handle; 424. Connecting block; 425. Link; 4251. Kidney-shaped hole; 4252. Top block; 426. Locking block; 4261. Locking groove; 427. Bearing base; 43. Self-locking component; 431. Positioning block; 4311. Trajectory groove; 432. Torsion spring; 433. Rotating shaft; 434. Pin column; 5. Horizontal rotation mechanism; 51. Rotating component; 511. Fixed disk; 512. Mounting plate; 513. Fixed seat; 52. Rotating locking component; 521. Support frame; 522. Electromagnet; 523. Plug pin; 524. Position hole; 53. Damping component; 531. Fixed plate; 532. Spring; 533. Damping bracket; 534. External thread bearing; 535. Damping groove. Detailed Embodiment

[0034] The present invention will be further described below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0035] As Figure 1As shown in the figure, the arm adjustment system of the embodiment of the present invention includes a lifting mechanism 3, a vertical pitching mechanism 4, and a horizontal rotation mechanism 5; the lifting mechanism 3 includes a guide rail 31, a sliding assembly 32, and a lifting locking assembly 34. The sliding assembly 32 is slidably installed in the guide rail 31 and locked in the guide rail 31 by the lifting locking assembly 34; the sliding assembly 32 includes a slider 321, a spring piece 323, and a pulley 322. The slider 321 is located in the guide rail 31, the spring piece 323 is clamped on the slider 321, and the pulley 322 is located at both ends of the spring piece 323 for sliding guidance; the vertical pitching mechanism 4 includes a rotating end 41 at one end of the arm 2 and a pitching locking assembly 42. The rotating end 41 of the arm 2 is rotatably installed on the sliding assembly 32 and locked in the rotating position by the pitching locking assembly 42; the rotating direction of the rotating end 41 is the vertical pitching direction; the horizontal rotation mechanism 5 includes a rotating assembly 51 on the guide rail 31 and a rotation locking assembly 52. The rotating assembly 51 of the guide rail 31 is rotatably installed on the box body 1 of the fitness device and locked in the rotating position by the rotation locking assembly 52; the rotating direction of the rotating assembly 51 is the horizontal rotation.

[0036] The arm adjustment system of the present invention realizes the up and down lifting movement of the arm 2 through the lifting mechanism 3 and locks the lifting position through the lifting locking assembly 34, realizes the up and down pitching movement of the arm 2 through the vertical pitching mechanism 4 and locks the up and down pitching position through the pitching locking assembly 42, realizes the horizontal rotation of the arm 2 through the horizontal rotation mechanism 5 and locks the horizontal rotation direction through the rotation locking assembly 52, and finally realizes the adjustment of the arm 2 in three directions; in the above-mentioned lifting mechanism 3, the upper and lower pulleys 322 are installed on the slider 321 through the same spring piece 323, so that the upper and lower pulleys 322 can be guaranteed to be on the same vertical line. Through the above setting, the four wheels on the upper, lower, left and right are on the same plane and maintain a symmetrical relationship in pairs. At this time, the slider 321 is supported by the spring piece 323 and does not contact the guide rail 31, so the sliding process is very smooth; moreover, the above overall structure is simple, the operation is simple and easy to implement.

[0037] In a specific embodiment, as Figure 2-3 shown, limiting components 33 (such as steel pin limiting columns) are provided at both ends of the slider 321. The spring piece 323 is installed on the slider 321 with an interference fit and is clamped on the slider 321 by steel pins on the left and right. The pulley 322 is fixed on the spring piece 323 through a fixed shaft. The spring piece 323 is installed on the slider 321 with an interference fit and fixed on the slider 321 by steel pins (not fixed by screws), so as to ensure the installation symmetry of each pulley 322 and further ensure the smoothness of the up and down sliding.

[0038] Among them, the cross-section of the guide rail 31 is V-shaped, so that the pulley 322 is in line contact with the V-shaped guide rail 31. When the slider 321 moves in the guide rail 31, the four pulleys 322 at both ends of the slider 321 perform rolling motion in the V-shaped guide rail 31. Since the contact between the pulley 322 and the V-shaped guide rail 31 is line contact, the friction during the movement is reduced, ensuring the smooth up and down movement of the overall arm 2.

[0039] When the whole moves normally in the guide rail 31, there is a gap between the slider 321 and the guide rail 31. The pulley 322 is in line contact with the guide rail 31, and the force on the pulley 322 is small, so the spring piece 323 does not undergo elastic deformation. The four pulleys 322 perform rolling motion in the V-shaped groove of the guide rail 31, reducing the friction during the movement; when the front end arm 2 is stressed, the spring piece 323 undergoes elastic deformation. When the spring piece 323 deforms to a certain extent, the slider 321 will contact and be stressed by the guide rail 31, preventing further deformation of the pulley 322 and the spring piece 323 and plastic deformation, effectively ensuring the up and down sliding. When the user stops exercising and the front end of the arm 2 is no longer subjected to tensile force, the spring piece 323 returns to its initial state, and the slider 321 no longer contacts the guide rail 31. At this time, it is the four pulleys 322 on the spring piece 323 that contact the guide rail 31, which can ensure that the entire arm 2 can slide up and down normally.

[0040] Further, after the slider 321 moves to a predetermined position, the slider 321 is locked in the guide rail 31 by the lifting and locking assembly 34. Specifically, as Figure 4 shown, the lifting and locking assembly 34 includes a rotating link 341, a rotating switch handle 342, a indexing pin 343 and a locking sleeve 344. One end of the rotating link 341 is hinged to the rotating end of the arm. One end of the indexing pin 343 is located at the other end of the rotating link 341. The rotating switch handle 342 is located on one side of the rotating link 341. The number of locking sleeves 344 is multiple and they are arranged at intervals on the guide rail 31; when one end of the indexing pin 343 is inserted into the locking sleeve 344, the locking of the lifting movement is achieved. During adjustment, pull the rotating switch handle 342 upward to drive the rotating link 341 to rotate around the hinged end, so that the indexing pin 343 moves upward and disengages from the locking sleeve 344. Then move the arm 2 to the predetermined position and then release the rotating switch handle 342, so that the indexing pin 343 is inserted into the locking sleeve 344 at the corresponding position, realizing the locking of the lifting position, thereby achieving the purpose of lifting adjustment. The overall structure of the above-mentioned lifting and locking assembly 34 is simple, the operation is simple and it is easy to implement.

[0041] In a specific embodiment, the position locking in the up and down pitching direction of the arm 2 is realized by the pitching locking assembly 42. As Figure 6-7As shown, the specific structure of the pitch locking component 42 includes a locking tooth 421 on the rotating end 41, a mounting block 422, a rotating switch handle 423, a connecting block 424, a connecting rod 425, and a locking block 426. A pair of bearing bases 427 are provided on the mounting block 422. One end of the connecting block 424 is rotatably mounted on the bearing base 427. The rotating switch handle 423 is connected to one end of the connecting block 424. The other end of the connecting block 424 is hinged to one end of the connecting rod 425. The other end of the connecting rod 425 is connected to one end of the locking block 426. A locking groove 4261 that cooperates with the locking tooth 421 is provided at the other end of the locking block 426. During specific adjustment, rotate the rotating switch handle 423 so that the connecting block 424 rotates and its other end moves upward, thereby lifting the locking block 426 upward through the connecting rod 425, causing the locking groove 4261 at the other end of the locking block 426 to disengage from the locking tooth 421. Then, adjust the arm 2 to pitch up and down to a suitable position, as Figure 5 shown. Then, release the rotating switch handle 423, and the locking block 426 automatically descends, and the locking groove 4261 meshes with the locking tooth 421 to achieve locking of the up and down pitching position of the arm 2. The overall structure of the above pitch locking component 42 is simple, easy to operate, and easy to implement.

[0042] Furthermore, a self-locking assembly 43 is provided on the mounting block 422 to ensure the reliability of the arm 2 when locked in the up and down pitch position, and to ensure the safety of the operator during training. The self-locking assembly 43 includes two positioning blocks 431, which are rotatably mounted on both sides of the mounting block 422, wherein a torsion spring 432 is provided on the rotating shaft 433 at the rotating end of the positioning block 431, so that the movable ends of the two positioning blocks 431 are close to each other to resist the top of the locking block 426, so that the locking block 426 cannot move upward at will, thereby achieving the reliability of the up and down pitch locking position of the arm 2. In addition, a waist-shaped hole 4251 is provided at the other end of the connecting rod 425, and the locking block 426 is connected to the other end of the connecting rod 425 by a pin 434, that is, the pin 434 passes through the pin hole on one side of the locking block 426, then passes through the waist-shaped hole 4251, and then passes through the pin hole on the other side of the locking block 426; in addition, top blocks 4252 are provided on both sides of the connecting rod 425, and a track groove 4311 is provided on the inner side of the corresponding positioning block 431, and the top block 4252 slides in the track groove 4311. Specifically, when the operator rotates the switch handle 423, the connecting block 424 rotates, thereby causing the connecting rod 425 at the other end to move upward. Since the waist-shaped hole 4251 is provided on the connecting rod 425, the locking block 426 does not move during the upward lifting of the connecting rod 425, and the top blocks 4252 on both sides of the connecting rod 425 move upward along the track groove 4311 of the positioning block 431. The slope design of the track groove 4311 allows the top blocks 4252 to overcome the elastic force of the torsion spring 432 and push the two positioning blocks 431 outward, so that the positioning block 431 no longer supports the top of the locking block 426, thereby unlocking the locking block 426. After the locking block 426 is unlocked, the connecting rod 425 continues to rise, lifting the locking block 426 upward, so that the locking groove 4261 at the other end of the locking block 426 is disengaged from the locking tooth 421, thereby realizing the free adjustment of the arm 2 in pitch. Of course, in other embodiments, a spring may be provided on the connection 425 between the locking block 426 and the mounting block 422, and the locking block 426 may be self-locked by the elastic force of the spring.

[0043] In a specific embodiment, if Figure 8-9 As shown, the rotating assembly 51 includes a fixed disk 511, a mounting plate 512 and a fixed seat 513. The fixed disk 511 is fastened to the guide rail 31, the mounting plate 512 is fastened to the box body 1, and the fixed seat 513 is fastened to the mounting plate 512 by screws. The fixed disk 511 and the fixed seat 513 are located on both sides of the mounting plate 512 and are connected by bearings 514.

[0044] A damping assembly 53 is arranged on the circumferential side of the fixed disk 511, and the damping assembly 53 includes a fixed plate 531, a spring 532, a damping bracket 533 and an externally threaded bearing 534. The fixed plate 531 is fastened to the mounting plate 512, one end of the spring 532 is mounted on the fixed plate 531, and the damping bracket 533 is rotatably mounted on the fixed plate 531 by means of a shoulder screw and a washer, one end of the damping bracket 533 is abutted against the other end of the spring 532, and the externally threaded bearing 534 is connected to the other end of the damping bracket 533 by means of a thread, and a damping groove 535 connected to the externally threaded bearing 534 is arranged on the circumferential side of the fixed disk 511.

[0045] The rotation locking assembly 52 includes a support frame 521, an electromagnet 522 and a latch 523. The support frame 521 is mounted on the mounting plate 512 by screws, and the electromagnet 522 is mounted on the support frame 521 by screws. The electromagnet 522 is movably connected to one end of the latch 523 by a snap pin, and the other end of the latch 523 passes through the fixing hole of the mounting plate 512 and extends into the position hole 524 on the fixing plate 511 to achieve rotation locking. The above-mentioned fixing by the latch 523 is not only simple in structure, but also has no gap, which can meet the needs of users.

[0046] When adjusting, the electromagnet 522 is energized, and the latch 523 is pulled up. At this time, the fixed disk 511 can rotate horizontally. Since the fixed disk 511 has a limit foot, the horizontal rotation angle is 90 degrees. At the same time, the damping bracket 533 is subjected to the elastic force of the spring 532, and the external threaded bearing 534514 supports the fixed disk 511. When the external threaded bearing 534514 rotates to the damping groove (groove) of the fixed disk 511, the fixed disk 511 will be slightly stuck, so that the gear position reached can be judged. The mechanism can also adjust the damping size of the arm 2 when rotating by adjusting the position of the spring 532 nut to change the tightness of the spring 532. People swing the arm 2 to any 4 positions. When the electromagnet 522 is powered off, the latch 523 is reinserted into the position hole 524 in the fixed disk 511. At this time, the horizontal rotation of the arm 2 is limited, thereby achieving the purpose of horizontal adjustment.

[0047] The above assembly of the fixing seat 513 and the bearing 514 ensures that the arm 2 rotates without gap and does not shake. Secondly, the structure of the fixing plate 511 and the latch 523 cooperates to further ensure that the arm 2 is fixed without gap and the overall force effect of the fixing plate 511 meets the use requirements.

[0048] like Figure 1As shown in the figure, an embodiment of the present invention further provides an intelligent personal fitness device, which includes a box body 1 and the arm adjustment system as described above. Arms 2 are arranged on both sides of the box body 1, and the arms 2 can perform up-and-down lifting, up-and-down pitching, and horizontal rotation movements through the arm adjustment system as described above. The intelligent personal fitness device of the present invention includes the adjustment system as described above and also has the advantages of the adjustment system as described above.

[0049] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. An arm adjustment system, characterized in that, It includes a lifting mechanism (3), a vertical pitching mechanism (4) and a horizontal rotation mechanism (5); The lifting mechanism (3) includes a guide rail (31), a sliding component (32) and a lifting locking component (34). The sliding component (32) is slidably installed in the guide rail (31) and is locked in the guide rail (31) by the lifting locking component (34); The sliding component (32) includes a slider (321), a spring piece (323) and a pulley (322). The slider (321) is located in the guide rail (31), the spring piece (323) is clamped on the slider (321), and the pulley (322) is located at both ends of the spring piece (323) for sliding guidance; The vertical pitching mechanism (4) includes a rotating end (41) at one end of the arm (2) and a pitching locking component (42). The rotating end (41) of the arm (2) is rotatably installed on the sliding component (32) and is locked in the rotating position by the pitching locking component (42); The rotating direction of the rotating end (41) is the vertical pitching direction; The horizontal rotation mechanism (5) includes a rotating component (51) and a rotation locking component (52) located on the guide rail (31). The rotating component (51) of the guide rail (31) is rotatably installed on the box body (1) of the fitness device and is locked in the rotating position by the rotation locking component (52); The rotating direction of the rotating component (51) is the horizontal rotation; The specific structure of the pitching locking component (42) includes a locking tooth (421) on the rotating end (41), a mounting block (422), a rotating switch handle (423), a connecting block (424), a connecting rod (425) and a locking block (426). A pair of bearing bases (427) are provided on the mounting block (422). One end of the connecting block (424) is rotatably installed on the bearing base (427). The rotating switch handle (423) is connected to one end of the connecting block (424). The other end of the connecting block (424) is hinged to one end of the connecting rod (425). The other end of the connecting rod (425) is connected to one end of the locking block (426). A locking groove (4261) matching the locking tooth (421) is provided at the other end of the locking block (426); The mounting block (422) is also provided with a self-locking component (43) for pressing the locking block (426) against the rotating end (41); The self-locking assembly (43) includes two clamping blocks (431). The two clamping blocks (431) are rotatably installed on both sides of the mounting block (422). A torsion spring (432) is provided on the rotating shaft (433) at the rotating end of the clamping block (431), so that the movable ends of the two clamping blocks (431) approach each other to abut against the top of the lock block (426); a kidney-shaped hole (4251) is provided at the other end of the connecting rod (425). The lock block (426) is connected to the other end of the connecting rod (425) through a pin (434). After the pin (434) passes through the pin hole on one side of the lock block (426), it then passes through the kidney-shaped hole (4251) and then through the pin hole on the other side of the lock block (426); in addition, top blocks (4252) are provided on both sides of the connecting rod (425), and a track groove (4311) is provided on the inner side of the corresponding clamping block (431), and the top blocks (4252) slide in the track groove (4311).

2. The arm adjustment system according to claim 1, characterized in that, The spring piece (323) is installed on the slider (321) by interference fit.

3. The arm adjustment system according to claim 2, characterized in that, Limit components (33) are provided at both ends of the slider (321), and the spring piece (323) is limited on the slider (321) by the limit components (33).

4. The arm adjustment system according to any one of claims 1-3, characterized in that, The rotating assembly (51) includes a fixed disk (511), a mounting plate (512) and a fixed seat (513). The fixed disk (511) is firmly connected to the guide rail (31). The mounting plate (512) is fastened to the box body (1) of the fitness device. The fixed seat (513) is fastened to the mounting plate (512). The fixed disk (511) and the fixed seat (513) are located on both sides of the mounting plate (512) and are connected by a bearing.

5. The arm adjustment system according to claim 4, characterized in that, A damping assembly (53) is provided on the circumferential side of the fixed disk (511). The damping assembly (53) includes a fixed plate (531), a spring (532), a damping bracket (533) and an external thread bearing (534). The fixed plate (531) is fastened to the mounting plate (512). One end of the spring (532) is installed on the fixed plate (531). The damping bracket (533) is rotatably installed on the fixed plate (531). One end of the damping bracket (533) abuts against the other end of the spring (532). The external thread bearing (534) is located at the other end of the damping bracket (533). A damping groove (535) matching the external thread bearing (534) is provided on the circumferential side of the fixed disk (511).

6. The arm adjustment system according to claim 5, wherein The rotation locking assembly (52) includes a support frame (521), an electromagnet (522) and a bolt (523). The support frame (521) is installed on the mounting plate (512). The electromagnet (522) is installed on the support frame (521). The electromagnet (522) is movably connected to one end of the bolt (523). After the other end of the bolt (523) passes through the fixing hole of the mounting plate (512), it extends into the position hole (524) on the fixed disk (511) to achieve rotation locking.

7. An intelligent personal fitness device, comprising a box body (1), and arms (2) are arranged on both sides of the box body (1), characterized in that, It also includes the arm adjustment system according to any one of claims 1 to 6.

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