Barbell disc positioning device

Abstract

The utility model relates to the technical field of barbell disc positioning, and discloses a barbell disc positioning device which comprises a shell, the top end of the shell is fixedly connected with a containing disc, dumbbell discs are placed at the top end of the containing disc, the inner wall of the shell is fixedly connected with a fourth fixing rod, and the center of the fourth fixing rod is rotationally sleeved with a fourth transmission shaft. The upper end of the fourth transmission shaft is meshed with the inner end of a spiral transmission shaft, and the outer end of the spiral transmission shaft is sleeved with a spiral sliding block in a threaded mode. In the using process, the dumbbell pieces are fixed by enabling the positioning columns, the spiral sliding blocks and the fixing blocks to slide towards the center, compared with the prior art, due to the fact that the gears can bear large torque, the transmitted power is relatively high, in the gear transmission process, the gears are in rolling contact, and the gear transmission efficiency is improved. The friction is small, and the manual rotation is adopted, so that the rotation stability and the force control degree are higher, and the transmission reliability is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of barbell plate positioning, and more specifically, to a barbell plate positioning device. Background Art

[0002] When processing dumbbell plates, they usually need to be turned into shape using a machine tool. During the turning process of the dumbbells, a workpiece positioning device is required to position the dumbbells for turning. However, as far as the current traditional dumbbell positioning device is concerned, when it is installed on a turning machine tool for use, it is easily shaken by the vibration of the machine tool, thereby affecting the turning effect. The common dumbbell positioning device only fixes the center of the dumbbell and drives it to rotate, and then turns the other end of the dumbbell. The position needs to be changed successively for turning, and the turning efficiency is low. The position cannot be adjusted while the dumbbell is supported, so it still needs manual adjustment by the worker, and different models of dumbbells cannot be positioned and fixed while the dumbbells are guaranteed to rotate. After the dumbbells are positioned and fixed, there is a lack of an automatic positioning support structure. The dumbbells are prone to push the fixture to continue to move downward by their own weight, which makes it impossible to position them. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a barbell plate positioning device, which has the advantages of being able to be fastened and freely rotated at a certain angle.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a barbell plate positioning device,

[0005] The top of the shell is fixedly connected with a placing plate, and a dumbbell plate is placed on the top of the placing plate, the inner wall of the shell is fixedly connected with a fourth fixing rod, the inner wall of the fourth fixing rod is movably connected with a fourth transmission shaft, the lower oblique side surface of the fourth transmission shaft is movably connected with the first transmission shaft and meshes with the first transmission shaft, one end of the first transmission shaft passes through the outer wall of the shell and is fixedly connected to the outer surface of the shell with the first rocker arm, the outer surface of the first transmission shaft is movably connected with the second fixing rod, the upper oblique surface of the fourth transmission shaft is movably connected with a spiral transmission shaft, and the spiral transmission shafts are meshed with each other, and the spiral transmission shafts are evenly distributed around the fourth transmission shaft, the outer surface of the spiral transmission shaft is movably connected with a spiral slider, the bottom end of the spiral slider is fixedly connected with a third fixing rod, the bottom inner wall of the third fixing rod is movably connected with the outer surface of the fourth fixing rod, the top of the spiral slider is fixedly connected with a fixing block, the top of the fixing block is rotatably connected with a positioning column, and a gear groove is provided below the positioning column.

[0006] As a preferred technical solution of the utility model, a sixth fixing rod is fixedly connected to the bottom end of the inner wall of the shell, and a second transmission shaft is movably connected to the inner wall of the top end of the sixth fixing rod, one end of the second transmission shaft passes through the outer wall of the shell and is fixedly connected to the outer surface of the shell with the second rocker, the second fixing rod is fixedly connected to the outer wall of the top end of the sixth fixing rod, and a fifth fixing rod is fixedly connected to the outer surface of the second fixing rod, and the inner wall of the fifth fixing rod is movably connected to the third transmission shaft, the bottom oblique side surface of the third transmission shaft is movably connected to the second transmission shaft, the top oblique side surface of the third transmission shaft is movably connected to the sixth transmission shaft, and the sixth transmission shaft is evenly distributed around the third transmission shaft, the outer surface of the sixth transmission shaft is movably connected to the first fixing rod, and the other end oblique side surface of the sixth transmission shaft is movably connected to the fifth transmission shaft, the oblique side surface of the top end of the fifth transmission shaft is meshed with the inner wall of the belt gear, the inner wall of the other end of the belt gear is movably connected to the fixing shaft and meshed with each other, and the bottom end of the fixing shaft is fixedly connected to the top inner wall of the shell, and the outer wall of the belt gear is meshed with the outer surface below the positioning column.

[0007] As a preferred technical solution of the utility model, the belt gear is a polyurethane gear belt, and the gear gap between the positioning column and the belt gear is ≤0.2 mm;

[0008] As a preferred technical solution of the utility model, the bottom end of the inner wall of the shell is fixedly connected with a first fixing rod, the number of which is three and evenly distributed at the bottom end of the inner wall of the shell, the top inner wall of the first fixing rod is movably connected to the outer surface of the sixth transmission shaft, and the top inner part of the first fixing rod has a bearing;

[0009] As a preferred technical solution of the utility model, the outer wall of the second transmission shaft penetrates rightward to the outer wall of the housing and is fixedly connected to the second rocker, and the second rocker is installed on the outer surface of the housing, and the outer surface of the second rocker handle is provided with a rubber protective sleeve;

[0010] As a preferred technical solution of the utility model, the outer surface of the top end of the fifth transmission shaft meshes with the inner wall of the belt gear, the inner wall of the other end of the belt gear is movably connected with a fixed shaft and meshes with each other, and the bottom end of the fixed shaft is fixedly connected to the top inner wall of the shell, and the outer wall of the belt gear meshes with the lower outer surface of the positioning column;

[0011] As a preferred technical solution of the utility model, the outer surface of the spiral transmission shaft is movably connected to the inner wall of the spiral slider, and both the outer surface of the spiral transmission shaft and the inner wall of the spiral slider have spiral patterns, and a force is generated when the spiral transmission shaft rotates;

[0012] As a preferred technical solution of the utility model, the top of the housing is fixedly connected with a laser beam, and is located on the left and right sides of the top of the housing, the bottom of the middle end of the laser beam is movably connected with a telescopic rod, and the bottom end of the telescopic rod is movably connected with a laser head; and the telescopic rod can be extended up and down;

[0013] As a preferred technical solution of the utility model,

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] 1. The utility model is provided with a positioning column and a spiral transmission shaft. The first rocker is rotated clockwise to rotate the first transmission shaft, the fourth transmission shaft and the spiral transmission shaft synchronously, so that the positioning column, the spiral slider, the fixing block and the third fixing rod slide toward the center to fix the dumbbell. Compared with the prior art, the technology of the utility model utilizes multiple gears to rotate synchronously to drive the positioning column to slide toward the center. Since the gears can withstand large torque, the transmitted power is relatively high. In the process of gear transmission, the contact between the gears is rolling contact with small friction. Combined with manual rotation, the rotation is smooth and the force control is higher, and the transmission reliability is stronger.

[0016] 2. The utility model is provided with a second rocker, and the second rocker is rotated clockwise, and the internal mechanism rotates synchronously, so that the angle of the fixed dumbbell piece can be adjusted. Compared with the prior art, the utility model uses a gear belt to transmit power, and the fixed dumbbell piece does not need to be taken out for adjustment, which greatly improves work efficiency and convenience and speed in use. The low friction of the belt gear transmission greatly reduces the friction for precision devices, and manual rotation is conducive to smooth rotation and higher control of force. In addition, the maintenance cost of the gear belt transmission is relatively low, and fewer parts need to be maintained, which effectively reduces the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the planing surface structure of the utility model when viewed from above;

[0019] Figure 3 This is a schematic diagram of the internal structure of the utility model;

[0020] Figure 4 For this utility model Figure 3 The enlarged structural diagram at A in the middle;

[0021] Figure 5 This is a schematic diagram of the planing surface structure of the utility model from the left side;

[0022] Figure 6This is a schematic diagram of the structure of the fastening device of the utility model;

[0023] Figure 7 This is a schematic diagram of the structure of the rotating device of the utility model;

[0024] Figure 8 It is a schematic diagram of the internal planed surface structure of the utility model when viewed from above.

[0025] In the figure: 1. shell; 2. positioning column; 3. first rocker; 4. second rocker; 5. laser beam; 6. dumbbell plate; 7. belt gear; 8. telescopic rod; 9. laser head; 10. placement plate; 11. spiral slider; 12. spiral transmission shaft; 13. fixed block; 14. first transmission shaft; 15. second transmission shaft; 16. third transmission shaft; 17. fourth transmission shaft; 18. fifth transmission shaft; 19. sixth transmission shaft; 20. first fixed rod; 21. second fixed rod; 22. third fixed rod; 23. fourth fixed rod; 24. fifth fixed rod; 25. sixth fixed rod; 26. fixed shaft; 27. slider. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] like Figures 1 to 8 As shown, the utility model provides a barbell plate positioning device, the top of the shell 1 is fixedly connected with a placement plate 10, the top of the placement plate 10 is placed with a dumbbell plate 6, the inner wall of the shell 1 is fixedly connected with a fourth fixing rod 23, the outer surface of the fourth fixing rod 23 is movably sleeved with a third fixing rod 22, the center of the fourth fixing rod 23 is rotatably sleeved with a fourth transmission shaft 17, the upper end of the fourth transmission shaft 17 is meshed with the inner end of the spiral transmission shaft 12, and the number of spiral transmission shafts 12 is three and evenly distributed around the fourth transmission shaft 17, the outer end of the spiral transmission shaft 12 is threadedly sleeved with a spiral slider 11, the third fixing rod 22 is fixedly connected between the spiral slider 11 and the outer surface of the slider 27, the top of the spiral slider 11 is fixedly connected with a fixing block 13, the top of the fixing block 13 is rotatably sleeved with a positioning column 2, and the positioning column 2 penetrates upward to the top of the shell 1;

[0028] The lower end of the fourth transmission shaft 17 is meshed with the inner end of the outer surface of the first transmission shaft 14, and the outer end of the first transmission shaft 14 penetrates the outer wall of the housing 1 and is fixedly connected to the first rocker 3;

[0029] The inner wall of the bottom end of the housing 1 is fixedly connected with a sixth fixing rod 25, the top end of the sixth fixing rod 25 is fixedly connected with a second fixing rod 21, and the inner wall of the top end of the second fixing rod 21 is rotatably sleeved with the outer surface of the first transmission shaft 14;

[0030] Working principle: During use, the user places the dumbbell plate 6 on the top of the placement plate 10, and drives the first transmission shaft 14 to rotate synchronously clockwise by rotating the handle of the first rocker 3 clockwise, fixing 14, the first transmission shaft 14 drives the fourth transmission shaft 17 to rotate synchronously clockwise, and the fourth transmission shaft 17 drives the spiral transmission shaft 12 to rotate synchronously clockwise. At this time, the inner wall of the spiral slider 11 drives the positioning column 2, the spiral slider 11, the fixing block 13, and the third fixing rod 22 to slide toward the center following the spiral pattern on the surface of the spiral transmission shaft 12 due to the force generated on the outer surface of the spiral transmission shaft 12. At the same time, the inner wall of the bottom end of the third fixing rod 22 will also slide toward the center following the outer surface of the fourth fixing rod 23, so as to fix the dumbbell plate 6.

[0031] The top end of the sixth fixing rod 25 is rotatably sleeved with the second transmission shaft 15, the outer end of the second transmission shaft 15 penetrates the housing 1 and is fixedly connected to the second rocker 4, the outer surface of the second fixing rod 21 is fixedly connected with the fifth fixing rod 24, the inner end of the fifth fixing rod 24 is rotatably sleeved with the third transmission shaft 16, the bottom end of the outer surface of the third transmission shaft 16 is meshed with the inner end outer surface of the second transmission shaft 15, the inner wall of the bottom end of the housing 1 is fixedly installed with the first fixing rod 20, and the number is three and is evenly distributed at the center point of the housing 1, the top end of the first fixing rod 20 is rotatably sleeved with The sixth transmission shaft 19, the top end of the third transmission shaft 16 is meshed with the inner end of the sixth transmission shaft 19, and there are three sixth transmission shafts 19 and they are evenly distributed around the third transmission shaft 16, the outer end of the outer surface of the sixth transmission shaft 19 is meshed with the fifth transmission shaft 18, the top end of the fifth transmission shaft 18 penetrates upward to the inside of the housing 1 and is meshed with the inner wall of the belt gear 7, a fixed shaft 26 is fixedly installed inside the housing 1, the inner wall of the other end of the belt gear 7 is meshed with the fixed shaft 26, and the outer surface of the belt gear 7 is meshed with the lower part of the outer surface of the positioning column 2;

[0032] Working principle: During use, the user places the dumbbell plate 6 on the top of the placement plate 10, rotates the first rocker 3 clockwise to tighten the dumbbell plate 6, and then drives the second transmission shaft 15 to rotate clockwise synchronously by rotating the second rocker 4 synchronously clockwise, the second transmission shaft 15 drives the third transmission shaft 16 to rotate clockwise synchronously, the third transmission shaft 16 drives the sixth transmission shaft 19 to rotate clockwise synchronously, the sixth transmission shaft 19 drives the fifth transmission shaft 18 to rotate clockwise synchronously, and the second transmission shaft 15, the third transmission shaft 16, the sixth transmission shaft 19, and the fifth transmission shaft 18 are driven to rotate synchronously by rotating the handle of the second rocker 4 clockwise, at this time driving the belt gear 7 to transmit to the lower outer surface of the positioning column 2 to rotate the angle of the dumbbell plate 6.

[0033] Wherein, the belt gear 7 is a polyurethane gear belt, and the gear gap between the positioning column 2 and the belt gear 7 should be ≤0.2 mm;

[0034] During use, the user rotates the second rocker 4 clockwise, and the internal mechanism rotates synchronously to adjust the angle of the fixed dumbbell piece 6. Compared with the prior art, the utility model technology uses a gear belt made of polyurethane to transmit power. It is mainly oil-resistant, wear-resistant, aging-resistant, saturated oil-resistant, UV-resistant, low-noise, and speed-stable. The gear gap is less than or equal to 0.2 mm. The gear meshing transmission has a wide adaptability, high sibling efficiency, stable transmission, etc., which can ensure constant instantaneous transmission and achieve transmission required in various positions.

[0035] The bottom end of the inner wall of the housing 1 is fixedly connected with a first fixing rod 20, and there are three of them, which are evenly distributed at the bottom end of the inner wall of the housing 1. The inner wall of the top end of the first fixing rod 20 is movably connected to the outer surface of the sixth transmission shaft 19, and a bearing is provided inside the top end of the first fixing rod 20.

[0036] During use by the user, there are three first fixed rods 20, and the sixth transmission shaft 19 is fixed in place to prevent deviations in the size distance between the transmission shafts. Compared with the prior art, the utility model technology flexibly connects the transmission shaft with the fixed shaft to improve the transmission efficiency. In mechanical transmission, fixing the transmission shaft can directly transmit power to the next shaft, avoiding energy loss and improving transmission efficiency. In addition, the fixed connection between the bottom of the first fixed rod 20 and the outer shell 1 greatly increases the stabilizing effect, thereby avoiding deviations and reduced transmission efficiency and other related problems during the transmission process.

[0037] The outer wall of the second transmission shaft 15 penetrates rightward to the outer wall of the housing 1 and is fixedly connected to the second rocker 4, and the second rocker 4 is mounted on the outer surface of the housing 1, and the outer surface of the handle of the second rocker 4 is provided with a rubber protective sleeve;

[0038] During use, the user rotates the second rocker 4 clockwise, and the internal mechanism rotates synchronously, so as to adjust the angle of the fixed dumbbell plate 6. Compared with the prior art, the utility model uses the handle on the disc to rotate the inside to adjust the angle position, and a rubber protective cover is installed on the handle to prevent workers from rubbing the handle against their hands during use to cause skin abrasion, blisters, etc., thereby protecting the safety of workers as much as possible.

[0039] The outer surface of the top end of the fifth transmission shaft 18 meshes with the inner wall of the belt gear 7, the inner wall of the other end of the belt gear 7 is movably connected with a fixed shaft 26 and meshes with each other, and the bottom end of the fixed shaft 26 is fixedly connected to the inner wall of the top end of the housing 1, and the outer wall of the belt gear 7 meshes with the lower outer surface of the positioning column 2;

[0040] By using the technology of the utility model to transmit power through the gear belt, the already fixed dumbbell pieces 6 do not need to be taken out for adjustment, which greatly improves work efficiency and convenience in use. The low friction of the belt gear transmission greatly reduces the friction for precision devices. In addition, the maintenance cost of the gear belt transmission is relatively low, and fewer parts need to be maintained, which effectively reduces the maintenance cost.

[0041] The outer surface of the spiral transmission shaft 12 is movably connected to the inner wall of the spiral slider 11, and both the outer surface of the spiral transmission shaft 12 and the inner wall of the spiral slider 11 have spiral patterns, and a force is generated when the spiral transmission shaft 12 rotates;

[0042] During use, the user rotates the first rocker 3 clockwise to synchronously rotate the first transmission shaft 14, the fourth transmission shaft 17, and the spiral transmission shaft 12. Compared with the prior art, the technology of the utility model utilizes the reversal and sliding of the transmission system between the spiral patterns to improve the transmission efficiency. Compared with other transmission methods, the efficiency of the threaded transmission is higher, and the output power can be more effectively transmitted to the output. In addition, the structure of the threaded transmission is relatively simple, the transmission system is not easy to loosen or fail, and can work stably for a long time.

[0043] The top of the housing 1 is fixedly connected with a laser beam 5, and is located on the left and right sides of the top of the housing 1. The bottom of the middle end of the laser beam 5 is movably connected with a telescopic rod 8, and the bottom end of the telescopic rod 8 is movably connected with a laser head 9; and the telescopic rod 8 can be extended up and down;

[0044] During use, the user will prevent the disk 10 from being placed on the plate, adjust the fixing device, and then start the machine laser head 9 to work. Compared with the prior art, the technology of the utility model can achieve very high-precision engraving, and the engraved lines are clear and soft without jagged defects. In addition, the laser engraving technology does not require the production of molds, and engraving can be achieved with one drawing, which can save a lot of time and cost for making molds. In addition, the internal adjustable rotation can prevent workers from being accidentally injured.

[0045] The working principle and use process of this utility model:

[0046] During use, the user places the dumbbell piece 6 on the top of the placement plate 10, and drives the first transmission shaft 14 to rotate synchronously clockwise by rotating the handle of the first rocker 3 clockwise to fix the first transmission shaft 14. The first transmission shaft 14 drives the fourth transmission shaft 17 to rotate synchronously clockwise, and the fourth transmission shaft 17 drives the spiral transmission shaft 12 to rotate synchronously clockwise. At this time, the inner wall of the spiral slider 11 drives the positioning column 2, the spiral slider 11, the fixing block 13, and the third fixing rod 22 to slide toward the center following the spiral pattern on the surface of the spiral transmission shaft 12 due to the force generated by the outer surface of the spiral transmission shaft 12. At the same time, the inner wall of the bottom end of the third fixing rod 22 will also slide toward the center following the outer surface of the fourth fixing rod 23, so as to fix the dumbbell piece 6;

[0047] During use, the user places the dumbbell plate 6 on the top of the placement plate 10, rotates the first rocker 3 clockwise to tighten the dumbbell plate 6, and then drives the second transmission shaft 15 to rotate clockwise synchronously by rotating the second rocker 4 synchronously clockwise, the second transmission shaft 15 drives the third transmission shaft 16 to rotate clockwise synchronously, the third transmission shaft 16 drives the sixth transmission shaft 19 to rotate clockwise synchronously, the sixth transmission shaft 19 drives the fifth transmission shaft 18 to rotate clockwise synchronously, and the second transmission shaft 15, the third transmission shaft 16, the sixth transmission shaft 19, and the fifth transmission shaft 18 are driven to rotate synchronously by rotating the handle of the second rocker 4 clockwise, at this time driving the belt gear 7 to transmit to the lower outer surface of the positioning column 2 to rotate the angle of the dumbbell plate 6.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A barbell plate positioning device, comprising a housing (1), characterized in that: The top of the housing (1) is fixedly connected to a placement plate (10), a dumbbell plate (6) is placed on the top of the placement plate (10), the inner wall of the housing (1) is fixedly connected to a fourth fixing rod (23), the outer surface of the fourth fixing rod (23) is movably sleeved with a third fixing rod (22), the center of the fourth fixing rod (23) is rotatably sleeved with a fourth transmission shaft (17), the upper end of the fourth transmission shaft (17) is meshed with the inner end of the spiral transmission shaft (12), and the spiral transmission shaft (12) is rotatably sleeved with a fourth transmission shaft (17). The number of the shafts (12) is three and they are evenly distributed around the fourth transmission shaft (17). The outer end of the spiral transmission shaft (12) is threadedly sleeved with a spiral slider (11). A third fixing rod (22) is fixedly connected between the spiral slider (11) and the outer surface of the slider (27). The top end of the spiral slider (11) is fixedly connected with a fixing block (13). The top end of the fixing block (13) is rotatably sleeved with a positioning column (2), and the positioning column (2) penetrates upward to the top of the housing (1); The lower end of the fourth transmission shaft (17) is meshed with the inner end of the outer surface of the first transmission shaft (14); the outer end of the first transmission shaft (14) passes through the outer wall of the housing (1) and is fixedly connected to the first rocker (3); A sixth fixing rod (25) is fixedly connected to the inner wall of the bottom end of the housing (1), a second fixing rod (21) is fixedly connected to the top end of the sixth fixing rod (25), and a top inner wall of the second fixing rod (21) is rotatably sleeved with the outer surface of the first transmission shaft (14).

2. A barbell plate positioning device according to claim 1, characterized in that: The top end of the sixth fixed rod (25) is rotatably sleeved with a second transmission shaft (15); the outer end of the second transmission shaft (15) passes through the housing (1) and is fixedly connected to the second rocker (4); the outer surface of the second fixed rod (21) is fixedly connected with a fifth fixed rod (24); the inner end of the fifth fixed rod (24) is rotatably sleeved with a third transmission shaft (16); the bottom end of the outer surface of the third transmission shaft (16) is meshed with the inner end outer surface of the second transmission shaft (15); the inner wall of the bottom end of the housing (1) is fixedly mounted with three first fixed rods (20) which are evenly distributed around the center point of the housing (1); the top end of the first fixed rod (20) is rotatably sleeved with a sixth transmission shaft (16); The third transmission shaft (16) is meshed with the inner end of the sixth transmission shaft (19), and the number of the sixth transmission shafts (19) is three and is evenly distributed around the third transmission shaft (16). The outer end of the outer surface of the sixth transmission shaft (19) is meshed with the fifth transmission shaft (18). The top end of the fifth transmission shaft (18) penetrates upward into the interior of the housing (1) and is meshed with the inner wall of the belt gear (7). A fixed shaft (26) is fixedly installed inside the housing (1). The inner wall of the other end of the belt gear (7) is meshed with the fixed shaft (26). The outer surface of the belt gear (7) is meshed with the lower part of the outer surface of the positioning column (2).

3. A barbell plate positioning device according to claim 2, characterized in that: The belt gear (7) is a polyurethane gear-type belt, and the gear gap between the positioning column (2) and the belt gear (7) is ≤0.2 mm.

4. A barbell plate positioning device according to claim 1, characterized in that: The bottom end of the inner wall of the outer shell (1) is fixedly connected to a first fixing rod (20), and there are three of them, which are evenly distributed at the bottom end of the inner wall of the outer shell (1); the inner wall of the top end of the first fixing rod (20) is movably connected to the outer surface of the sixth transmission shaft (19), and a bearing is provided inside the top end of the first fixing rod (20).

5. A barbell plate positioning device according to claim 2, characterized in that: The outer wall of the second transmission shaft (15) penetrates rightward to the outer wall of the outer shell (1) and is fixedly connected to the second rocker (4), and the second rocker (4) is mounted on the outer surface of the outer shell (1), and the outer surface of the handle of the second rocker (4) is provided with a rubber protective sleeve.

6. A barbell plate positioning device according to claim 2, characterized in that: The outer surface of the top end of the fifth transmission shaft (18) meshes with the inner wall of the belt gear (7), the inner wall of the other end of the belt gear (7) is movably connected to a fixed shaft (26) and meshes with each other, and the bottom end of the fixed shaft (26) is fixedly connected to the inner wall of the top end of the housing (1), and the outer wall of the belt gear (7) meshes with the lower outer surface of the positioning column (2).

7. A barbell plate positioning device according to claim 1, characterized in that: The outer surface of the spiral transmission shaft (12) is movably connected to the inner wall of the spiral slider (11), and both the outer surface of the spiral transmission shaft (12) and the inner wall of the spiral slider (11) have spiral patterns.

8. A barbell plate positioning device according to claim 1, characterized in that: The top end of the housing (1) is fixedly connected to a laser beam (5), which is located on the left and right sides of the top end of the housing (1); the bottom middle end of the laser beam (5) is movably connected to a telescopic rod (8); the bottom end of the telescopic rod (8) is movably connected to a laser head (9); and the telescopic rod (8) can be extended and retracted up and down.

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