CN108721831B

CN108721831B - Dumbbell weight adjusting device

Info

Publication number: CN108721831B
Application number: CN201810816239.4A
Authority: CN
Inventors: 符绩承; 吴锡银
Original assignee: Anhui Xingle Fitness Equipment Co ltd
Current assignee: ANHUI XINGLE FITNESS EQUIPMENT Co.,Ltd.
Priority date: 2018-07-24
Filing date: 2018-07-24
Publication date: 2020-12-01
Anticipated expiration: 2038-07-24
Also published as: CN108721831A

Abstract

The invention relates to a dumbbell weight adjusting device, and belongs to the technical field of fitness products. The dumbbell comprises a dumbbell body and a dumbbell supporting device, wherein a dumbbell rod is arranged in the dumbbell body, first dumbbell pieces are arranged at two ends of the dumbbell rod, a second dumbbell piece is tightly attached to the outer side surface of each first dumbbell piece, a third dumbbell piece is tightly attached to the outer side surface of each second dumbbell piece, and a fourth dumbbell piece is tightly attached to the outer side surface of each third dumbbell piece; the dumbbell supporting device is provided with a supporting frame, a dumbbell sheet supporting block and an adjusting plate, and the position of the dumbbell sheet supporting block can be adjusted through the action of the adjusting plate. The dumbbell can increase or reduce the weight of the dumbbell by pressing different control rods, does not need to use an external tool, and is convenient to use; the dumbbell solves the problem that the dumbbell rod is subjected to rotating acting force when the dumbbell is not lifted in a certain direction; the invention prevents misoperation and ensures the use safety.

Description

Dumbbell weight adjusting device

Technical Field

The invention relates to a dumbbell weight adjusting device, and belongs to the technical field of fitness products.

Background

The auxiliary equipment for weight lifting and body building exercises has a simple structure, is convenient to use, and can be used for strengthening muscle strength training.

The traditional dumbbells are divided into various models according to different weights, the weights of the traditional dumbbells are not adjustable, and a user needs to purchase a plurality of sets of dumbbells with different weights along with the increase of exercise time so as to meet the requirement of strength increase, which undoubtedly increases the cost; afterwards, the dumbbell that weight can be adjusted has appeared, and its structure disposes polylith dumbbell piece at the both ends of dumbbell pole, fixes through bolt and nut, and the user can dismantle the dumbbell piece as required, and its troublesome poeration need be with the help of instruments such as spanner, is not convenient for use.

In the prior art, the patent with application number 201620757677.4 discloses a weight-adjustable dumbbell, which comprises a plurality of dumbbell sheets, wherein two ends of the dumbbell sheet are used for accommodating a base of the dumbbell sheet which is vertically placed, a holding part is arranged in the middle of the dumbbell sheet, the dumbbell sheets with different weights are automatically locked at two ends of the dumbbell sheet when the dumbbell sheet rotates for different angles, and the rest dumbbell sheets are kept in dumbbell rods in the base; the dumbbell rod comprises a mandrel with a holding part in the middle, weight adjusting turntables fixed at the end part of the mandrel are arranged at two ends of the mandrel, are respectively matched with the shapes of the dumbbell pieces and rotate together with the weight adjusting turntables, so that the dumbbell pieces with corresponding weights are clamped on the outer edges of the dumbbell pieces, and the dumbbell pieces are locked with a plurality of cam pieces on the dumbbell pieces; however, in the technology, because one edge of each dumbbell sheet is provided with a deeper groove, the position of the gravity center of each dumbbell sheet is far deviated from the central axis of the dumbbell sheet; when the dumbbell is operated, the dumbbell rod is subjected to rotating force due to different dumbbell lifting directions, and at the moment, the palm of an operator is also subjected to the rotating friction force of the dumbbell rod, so that the dumbbell is labor-consuming to use by the guide post, and the arm can be pulled possibly; and because the positioning button of the dumbbell is arranged at a place easy to operate by mistake, when the positioning button is operated by mistake, the dumbbell piece in the dumbbell rod falls off to injure people, and great potential safety hazard exists.

Therefore, the dumbbell weight adjusting device provided by the invention is more practical.

Disclosure of Invention

The present invention is to solve the above problems in the prior art, and an object of the present invention is to provide a dumbbell weight adjusting apparatus.

The above object is achieved in that the following technical measures are adopted:

a dumbbell weight adjusting device comprises a dumbbell and a dumbbell supporting device, wherein a dumbbell rod is arranged in the dumbbell, first dumbbell pieces are mounted at two ends of the dumbbell rod, a second dumbbell piece is mounted on the outer side surface of each first dumbbell piece in a clinging mode, a third dumbbell piece is mounted on the outer side surface of each second dumbbell piece in a clinging mode, and a fourth dumbbell piece is mounted on the outer side surface of each third dumbbell piece in a clinging mode; the dumbbell supporting device is provided with a supporting frame, two ends of the supporting frame are respectively provided with an end cover through screws, the upper surface of the supporting frame is symmetrically provided with 2 dumbbell supporting plates through screws, the upper surface of the supporting frame is also provided with 2 first dumbbell sheet supporting blocks, 2 second dumbbell sheet supporting blocks, 2 third dumbbell sheet supporting blocks and 2 fourth dumbbell sheet supporting blocks, one first dumbbell sheet supporting block is positioned beside the outer side surface of one dumbbell supporting plate, the other first dumbbell sheet supporting block is positioned beside the outer side surface of the other dumbbell supporting plate, one second dumbbell sheet supporting block is tightly attached to the outer side surface of one first dumbbell sheet supporting block, the other second dumbbell sheet supporting block is tightly attached to the outer side surface of the other first dumbbell sheet supporting block, one third dumbbell sheet supporting block is tightly attached to the outer side surface of one second dumbbell sheet supporting block, the other third dumbbell piece supporting block is tightly attached to the outer side face of the other second dumbbell piece supporting block, one fourth dumbbell piece supporting block is tightly attached to the outer side face of one third dumbbell piece supporting block, and the other fourth dumbbell piece supporting block is tightly attached to the outer side face of the other third dumbbell piece supporting block; a fifth guide pillar is arranged between each end cover and the support frame, each fifth guide pillar is respectively provided with a first dumbbell sheet supporting block, a second dumbbell sheet supporting block, a third dumbbell sheet supporting block and a third dumbbell sheet supporting block, adjacent dumbbell supporting blocks on the same fifth guide pillar are in contact, each fifth guide pillar is also provided with a spring, and the spring is positioned between the end cover on the same side and the fourth dumbbell supporting block on the same side; 2 first guide pillars, 2 second guide pillars, 2 third guide pillars and 2 fourth guide pillars are further arranged between two long surfaces of the support frame, a first adjusting plate is jointly installed between the 2 first guide pillars, the first adjusting plate is located between the bottoms of the 2 first dumbbell sheet supporting blocks, a spring and a limiting ring are installed on each first guide pillar, the spring and the limiting ring are located between the first adjusting plate and the support frame and are not located on the same side, a second adjusting plate is jointly installed between the 2 second guide pillars, the second adjusting plate is located between the bottoms of the 2 second dumbbell sheet supporting blocks, a spring and a limiting ring are installed on each second guide pillar, the spring and the limiting ring are located between the second adjusting plate and the support frame and are not located on the same side, a third adjusting plate is jointly installed between the 2 third guide columns, the third adjusting plate is located between the bottoms of the 2 third dumbbell piece supporting blocks, a spring and a limiting ring are installed on each third guide column, the spring and the limiting ring are located between the third adjusting plate and the supporting frame, the spring and the limiting ring are not located on the same side, a fourth adjusting plate is jointly installed between the 2 fourth guide columns, the fourth adjusting plate is located between the bottoms of the 2 fourth dumbbell piece supporting blocks, the spring and the limiting ring are installed on each fourth guide column, the spring and the limiting ring are located between the fourth adjusting plate and the supporting frame, and the spring and the limiting ring are not located on the same side; the second adjusting plate is positioned at the bottom of the first adjusting plate, the third adjusting plate is positioned at the bottom of the second adjusting plate, and the fourth adjusting plate is positioned at the bottom of the third adjusting plate; first regulating plate with be equipped with first control lever between the long face of one side of support frame, the second regulating plate with be equipped with the second control lever between the long face of one side of support frame, the third regulating plate with be equipped with the third control lever between the long face of one side of support frame, the fourth regulating plate with be equipped with the fourth control lever between the long face of one side of support frame, just every control lever all is located on the same long face of one side of support frame.

Preferably, 2 avoiding chutes, 4 trapezoid chutes and 4 screw holes are symmetrically arranged on the upper surface of the support frame, 2 first guide pillar fixing holes, 2 second guide pillar fixing holes, 2 third guide pillar fixing holes and 2 fourth guide pillar fixing holes are symmetrically arranged on each side long surface of the support frame, a first control rod sliding hole, a second control rod sliding hole, a third control rod sliding hole and a fourth control rod sliding hole are sequentially arranged in the middle of one side long surface from top to bottom, and 4 screw holes are respectively arranged on 2 sections of the support frame.

Preferably, 4 corners of the end cover are respectively provided with a screw through hole, the end cover is further provided with a fifth guide pillar fixing hole, and the fifth guide pillar fixing hole is close to the upper part of the end cover.

Preferably, an arc-shaped dumbbell piece supporting surface is arranged on the upper surface of the first dumbbell piece supporting block, an arc-shaped dumbbell piece fixing strip is arranged on the dumbbell piece supporting surface, the circle center of the dumbbell piece fixing strip is the same as that of the dumbbell piece supporting surface, a dumbbell piece positioning block with a semicircular cross section is arranged at the lowest point of the dumbbell piece supporting surface, and the dumbbell piece positioning block is intersected with the dumbbell piece fixing strip; an adjusting top block and 2 trapezoidal sliding blocks are arranged on the bottom surface of the first dumbbell sheet supporting block, the adjusting top block is located in the middle of the bottom surface of the first dumbbell sheet supporting block, the 2 trapezoidal sliding blocks are located on two sides of the adjusting top block respectively, and a fifth guide pillar sliding hole is further formed in the adjusting top block; the length of the adjusting top block in each dumbbell supporting block is different, the rest structures and the sizes are the same, the bottom of the adjusting top block in the second dumbbell supporting block is longer than the bottom of the adjusting top block in the first dumbbell supporting block by an adjusting plate thickness, the bottom of the adjusting top block in the third dumbbell supporting block is longer than the bottom of the adjusting top block in the second dumbbell supporting block by an adjusting plate thickness, and the bottom of the adjusting top block in the fourth dumbbell supporting block is longer than the bottom of the adjusting top block in the third dumbbell supporting block by an adjusting plate thickness.

Preferably, the first adjusting plate is of a symmetrical structure, 2 guide post sliding holes are formed in the first adjusting plate, a first clamping surface and a second clamping surface are arranged on two side surfaces of the first adjusting plate, a 45-degree inclined surface is arranged between the first clamping surface and the second clamping surface, the first clamping surface and the second clamping surface are parallel to each other, and the vertical distance between the first clamping surface and the second clamping surface is larger than the thickness of the dumbbell sheet; the edge structures of the adjusting plates are the same, and the length of the second adjusting plate is longer than that of the first adjusting plate by the thickness of 2 dumbbell piece supporting blocks; the length of the third adjusting plate is longer than that of the second adjusting plate by the thickness of 2 dumbbell piece supporting blocks; the length of the fourth adjusting plate is longer than that of the third adjusting plate by the thickness of 2 dumbbell piece supporting blocks; when pressing down first control lever, first regulating plate will make all dumbbells all slide toward the outside, when pressing down the second control lever, the second regulating plate will make second dumbbell piece, third dumbbell piece, fourth dumbbell piece all slide toward the outside, when pressing down the third control lever, the third regulating plate will make third dumbbell piece, fourth dumbbell piece all slide toward the outside, when pressing down the fourth control lever, the fourth regulating plate will make fourth dumbbell piece slide toward the outside.

Preferably, the lower end of the dumbbell rod supporting plate is provided with 2 screw through holes, the middle part of the upper end of the dumbbell rod supporting plate is provided with a U-shaped dumbbell rod supporting groove, and the upper edges of the dumbbell rod supporting grooves are rounded; the dumbbell rod supporting groove is used for being matched with the dumbbell rod positioning block to install and position the dumbbell rod.

Preferably, the first dumbbell piece is formed by connecting two identical half-side dumbbell pieces through rivets, the first dumbbell piece is circular, an annular clamping groove is formed in the circumferential surface of the first dumbbell piece, a circular clamping pin sliding groove is formed in the first dumbbell piece, a spring action rod sliding groove and an ejector rod sliding groove are respectively formed in the upper quadrant point and the lower quadrant point of the clamping pin sliding groove, the ejector rod sliding groove is communicated with the clamping pin sliding groove and the annular sliding groove, a semicircular dumbbell piece positioning groove is formed in the bottommost portion of the first dumbbell piece and is located below the ejector rod sliding groove, 4 rivet through holes are further formed in the first dumbbell piece in an annular array mode and are located on the annular surface between the annular clamping groove and the clamping pin sliding groove, and a matching hole is further formed in the central shaft of the first dumbbell piece.

Preferably, the dumbbell rod is of a symmetrical structure, a first connecting handle, a limiting plate and a dumbbell rod positioning block are sequentially arranged at two ends of the dumbbell rod from outside to inside, a first clamping hole is formed in the first connecting handle, the width of the dumbbell rod positioning block is the same as that of the dumbbell rod supporting groove, and the outer diameter of the first connecting handle is the same as that of the matching hole in the first dumbbell sheet.

Preferably, a second connecting handle is arranged at the central shaft of the outer side surface of the second dumbbell piece, the rest structures of the second connecting handle are the same as those of the first dumbbell piece, the length of the second connecting handle is equal to the thickness of the second dumbbell piece, a second clamping hole is formed in the second connecting handle, and the outer diameter of the second connecting handle is the same as the inner diameter of the first connecting handle in the dumbbell rod; a third connecting handle is arranged at the central shaft of the outer side surface of the third dumbbell sheet, the rest structures of the third connecting handle are the same as those of the first dumbbell sheet, the length of the third connecting handle is equal to the thickness of the third dumbbell sheet, a third clamping hole is formed in the third connecting handle, and the outer diameter of the third connecting handle is the same as the diameter of a matching hole in the second dumbbell sheet; a fourth connecting handle is arranged at the central shaft of the outer side face of the fourth dumbbell piece, the inside of the fourth connecting handle is of a solid structure, the rest structures of the fourth connecting handle are the same as those of the first dumbbell piece, the length of the fourth connecting handle is equal to the thickness of the fourth dumbbell piece, a fourth clamping hole is formed in the fourth connecting handle, and the outer diameter of the fourth connecting handle is the same as the diameter of a matching hole in the third dumbbell piece.

Preferably, the first dumbbell piece, the second dumbbell piece and the third dumbbell piece are internally provided with bayonet locks, the bayonet locks are internally provided with transmission rings, the transmission rings are positioned in bayonet lock chutes, the upper quadrant points and the lower quadrant points of the transmission rings are respectively provided with spring action rods and ejector rods, the ejector rods are positioned in ejector rod chutes, the lower ends of the spring action rods are provided with clamping rods, the upper ends of the spring action rods are provided with springs, and the spring action rods and the springs are both positioned in spring action rod chutes.

The invention has the beneficial effects that: firstly, placing each dumbbell piece on a corresponding dumbbell piece supporting block, and clamping a dumbbell piece positioning groove in each dumbbell piece on a dumbbell piece positioning block in the corresponding dumbbell piece supporting block, wherein at the moment, an annular clamping groove in each dumbbell piece is also clamped on a dumbbell piece fixing strip in the corresponding dumbbell piece supporting block, so that the dumbbell pieces are balanced and cannot fall over; then, pressing the first control rod, enabling all dumbbells to slide towards the outer side through the first adjusting plate, then placing the dumbbell rods between 2 dumbbell rod supporting plates, enabling the dumbbell rod positioning blocks to be located in the dumbbell rod supporting grooves, then releasing the first control rod, enabling all dumbbell plates to return to the original positions at the moment, and enabling the first connecting handle in the dumbbell rod to be connected with the first dumbbell plates; when only the first dumbbell piece is arranged on the dumbbell rod, only the second control rod is pressed, the second adjusting plate can enable the second dumbbell piece, the third dumbbell piece and the fourth dumbbell piece to slide towards the outer side, then the dumbbell rod is lifted, the first dumbbell piece can be lifted along with the dumbbell rod, the clamping rod in the first dumbbell piece can be clamped in the first clamping hole in the dumbbell rod at the moment of lifting, at the moment, the first dumbbell piece cannot slide out of the dumbbell rod, when the dumbbell piece is put back to the original position, the second control rod is pressed, the second regulating plate can enable the second dumbbell piece, the third dumbbell piece and the fourth dumbbell piece to slide towards the outer side, then the dumbbell piece supporting block can be put back to the original position, the dumbbell piece fixing strip in the first dumbbell piece supporting block can push the bayonet lock to separate the clamping rod from the first clamping hole in the dumbbell rod, and at the moment, the first dumbbell piece and the dumbbell rod are in an unlocking state; when the first dumbbell piece and the second dumbbell piece are only required to be arranged on the dumbbell rod, only the third control rod needs to be pressed, the third adjusting plate can enable the third dumbbell piece and the fourth dumbbell piece to slide towards the outer side, then the dumbbell rod is lifted, the first dumbbell piece and the second dumbbell piece can also be lifted along with the dumbbell rod, the clamping rod in the first dumbbell piece is clamped in the first clamping hole in the dumbbell rod at the lifting moment, the clamping rod in the second dumbbell piece is also clamped in the second clamping hole in the second dumbbell piece, at the moment, the first dumbbell piece and the second dumbbell piece cannot slide out of the dumbbell rod, when the first dumbbell piece and the second dumbbell piece are required to be put back to the original position, the third control rod is pressed again, the third adjusting plate can enable the third dumbbell piece and the fourth dumbbell piece to slide towards the outer side, then the third dumbbell piece and the fourth dumbbell piece can be put back to the original position, at the moment, the dumbbell piece fixing strip in each dumbbell piece supporting block pushes the corresponding dumbbell piece to separate each clamping hole from each clamping rod, at the moment, the adjacent dumbbell pieces or dumbbell rods are in an unlocking state; when the first dumbbell piece, the second dumbbell piece and the third dumbbell piece are only needed to be arranged on the dumbbell rod, only the fourth control rod needs to be pressed, the fourth adjusting plate can enable the fourth dumbbell piece to slide towards the outer side, then the dumbbell rod is lifted, at the moment, the first dumbbell piece, the second dumbbell piece and the third dumbbell piece can also be lifted along with the dumbbell rod, at the moment of lifting, the clamping rod in the first dumbbell piece can be clamped in the first clamping hole in the dumbbell rod and can also be clamped in the second clamping hole in the second dumbbell piece, the clamping rod in the second dumbbell piece can also be clamped in the third clamping hole in the third dumbbell piece, at the moment, the first dumbbell piece, the second dumbbell piece and the third dumbbell piece cannot slide out of the dumbbell rod, at the moment, the fourth control rod is pressed again, the fourth adjusting plate can enable the fourth dumbbell piece to slide towards the outer side, then the clamping pins of the first dumbbell piece, the second dumbbell piece and the third dumbbell piece can be placed back, at the moment, the corresponding dumbbell pieces are pushed by the corresponding support blocks in the dumbbell pieces, separating each clamping rod from each corresponding clamping hole, wherein at the moment, the adjacent dumbbell pieces or dumbbell rods are in an unlocking state; when all the dumbbell pieces are to be lifted, only the dumbbell rod needs to be directly lifted, and the principle is the same as the above.

The invention overcomes the defects of the prior art, can increase or reduce the weight of the dumbbell by pressing different control rods, does not need to use an external tool, and is convenient to use; the centers of gravity of the dumbbell pieces are all positioned on the central shaft of the dumbbell pieces, so that when the dumbbell is lifted in a wrong direction, the dumbbell rod is not subjected to the action force of rotation, and the possibility of arm strain is prevented; when the dumbbell is placed on the dumbbell supporting device, the dumbbell piece and the dumbbell rod can be automatically unlocked, and when the dumbbell is lifted, the dumbbell piece and the dumbbell rod can be automatically locked, so that misoperation is prevented, and the use safety is ensured.

Drawings

FIG. 1 is a perspective view showing the top structure of a dumbbell weight adjusting apparatus according to the present invention.

Fig. 2 is a perspective view of a dumbbell weight adjusting apparatus according to the present invention.

FIG. 3 is a sectional view of a dumbbell weight adjustment device according to the present invention.

FIG. 4 is a perspective view showing the structure of a support frame in the weight adjustment device for a dumbbell according to the present invention.

FIG. 5 is a perspective view showing the structure of an end cap of a dumbbell weight adjusting apparatus according to the present invention.

FIG. 6 is a perspective view showing the structure of a first dumbbell sheet supporting block in the dumbbell weight adjusting apparatus according to the present invention.

FIG. 7 is a perspective view showing the construction of a first adjusting plate in a dumbbell weight adjusting apparatus according to the present invention.

FIG. 8 is a perspective view showing the structure of a dumbbell bar supporting plate in the dumbbell weight adjusting apparatus of the present invention.

FIG. 9 is a perspective view showing a structure in which dumbbell pieces are separated in a dumbbell weight adjusting apparatus according to the present invention.

FIG. 10 is a perspective view showing the internal structure of a first dumbbell sheet in the dumbbell weight adjusting apparatus of this invention.

FIG. 11 is a perspective view showing the structure of the latch of the dumbbell weight adjusting apparatus of the present invention.

FIG. 12 is a perspective view showing the structure of a dumbbell bar in the dumbbell weight adjusting apparatus of the present invention.

Part numbers in the above figures: 1-support frame, 2-end cap, 3-first dumbbell sheet support block, 4-second dumbbell sheet support block, 5-third dumbbell sheet support block, 6-fourth dumbbell sheet support block, 7-first regulating plate, 8-second regulating plate, 9-third regulating plate, 10-fourth regulating plate, 11-first guide pillar, 12-second guide pillar, 13-third guide pillar, 14-fourth guide pillar, 15-fifth guide pillar, 16-first control rod, 17-second control rod, 18-third control rod, 19-fourth control rod, 20-dumbbell rod support plate, 21-limit ring, 22-first dumbbell sheet, 23-second dumbbell sheet, 24-third dumbbell sheet, 25-fourth dumbbell sheet, 26-dumbbell rod, 27-bayonet, 101-first guide pillar fixing hole, 102-second guide pillar fixing hole, 103-third guide pillar fixing hole, 104-fourth guide pillar fixing hole, 105-fifth guide pillar fixing hole, 106-first control rod sliding hole, 107-second control rod sliding hole, 108-third control rod sliding hole, 109-fourth control rod sliding hole, 110-avoiding sliding groove, 111-trapezoidal sliding groove, 112-screw hole, 201-screw through hole, 301-dumbbell plate supporting surface, 302-dumbbell plate fixing strip, 303-dumbbell plate positioning block, 304-trapezoidal slider, 305-adjusting top block, 306-fifth guide pillar sliding hole, 701-guide pillar sliding hole, 702-first clamping surface, 703-second clamping surface, 704-inclined surface, 2001-dumbbell rod supporting groove, 2201-annular clamping groove, 2202-clamping pin sliding groove, 2203-matching hole, 2204-ejector rod sliding groove, 2205-spring action rod sliding groove, 2206-dumbbell plate positioning groove, 2207-rivet through hole, 2301-second connecting handle, 2302-second clamping hole, 2401-third connecting handle, 2402-third clamping hole, 2501-fourth connecting handle, 2502-fourth connecting handle, 2501-fourth connecting handle hole, and 2501-fourth connecting handle, 2602-limiting plate, 2603-dumbbell rod positioning block, 2604-first clamping hole, 2701-transmission ring, 2702-ejector rod, 2703-clamping rod, 2704-spring action rod.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings: it should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.

As shown in fig. 1 to 12, a dumbbell weight adjusting device comprises a dumbbell and a dumbbell supporting device, wherein a dumbbell rod 26 is arranged in the dumbbell, first dumbbell pieces 22 are respectively mounted at two ends of the dumbbell rod 26, a second dumbbell piece 23 is tightly attached to the outer side surface of each first dumbbell piece 22, a third dumbbell piece 24 is tightly attached to the outer side surface of each second dumbbell piece 23, and a fourth dumbbell piece 25 is tightly attached to the outer side surface of each third dumbbell piece 24; the dumbbell supporting device is provided with a supporting frame 1, two ends of the supporting frame 1 are respectively provided with an end cover 2 through screws, the upper surface of the supporting frame 1 is symmetrically provided with 2 dumbbell supporting plates 20 through screws, the upper surface of the supporting frame 1 is also provided with 2 first dumbbell

sheet supporting blocks

3, 2 second dumbbell

sheet supporting blocks

4, 2 third dumbbell

sheet supporting blocks

5 and 2 fourth dumbbell sheet supporting blocks 6, one dumbbell sheet supporting block 3 is positioned beside the outer side surface of one dumbbell supporting plate 20, the other dumbbell sheet supporting block 3 is positioned beside the outer side surface of the other dumbbell supporting plate 20, one second dumbbell sheet supporting block 4 is tightly attached to the outer side surface of one first dumbbell sheet supporting block 3, the other second dumbbell sheet supporting block 4 is tightly attached to the outer side surface of the other first dumbbell sheet supporting block 3, one of the third dumbbell sheet supporting blocks 5 is tightly attached to the outer side face of one of the second dumbbell sheet supporting blocks 4, the other one of the third dumbbell sheet supporting blocks 5 is tightly attached to the outer side face of the other one of the second dumbbell sheet supporting blocks 4, one of the fourth dumbbell sheet supporting blocks 6 is tightly attached to the outer side face of one of the third dumbbell sheet supporting blocks 5, and the other one of the fourth dumbbell sheet supporting blocks 6 is tightly attached to the outer side face of the other one of the third dumbbell sheet supporting blocks 5; a fifth guide pillar 15 is arranged between each end cover 2 and the support frame 1, each fifth guide pillar 15 is respectively provided with a first dumbbell sheet supporting block 3, a second dumbbell sheet supporting block 4, a third dumbbell sheet supporting block 5 and a third dumbbell sheet supporting block 6, adjacent dumbbell supporting blocks on the same fifth guide pillar 15 are in contact, each fifth guide pillar 15 is also provided with a spring, and the spring is arranged between the end cover 2 on the same side and the fourth dumbbell supporting block 6 on the same side; 2

first guide columns

11, 2

second guide columns

12, 2

third guide columns

13 and 2 fourth guide columns 14 are further arranged between two long surfaces of the support frame 1, a first adjusting plate 7 is jointly installed between the 2 first guide columns 11, the first adjusting plate 7 is located between the bottoms of the 2 dumbbell sheet supporting blocks 3, a spring and a limiting ring 21 are installed on each first guide column 11, the spring and the limiting ring 21 are located between the first adjusting plate 7 and the support frame 1, the spring and the limiting ring 21 are not located on the same side, a second adjusting plate 8 is jointly installed between the 2 second guide columns 12, the second adjusting plate 8 is located between the bottoms of the 2 dumbbell sheet supporting blocks 4, the spring and the limiting ring 21 are installed on each second guide column 12, and the spring and the limiting ring 21 are located between the second adjusting plate 8 and the support frame 1, and the spring and the limit ring 21 are not on the same side, a third adjusting plate 9 is arranged between the 2 third guide posts 13, and the third adjusting plate 9 is positioned between the bottoms of the 2 third dumbbell piece supporting blocks, each third guide post 13 is provided with a spring and a limiting ring 21, and the spring and the limit ring 21 are both positioned between the third adjusting plate 9 and the support frame 1, and the spring and the limit ring 21 are not on the same side, a fourth adjusting plate 10 is installed between the 2 fourth guide posts 14, and the fourth adjusting plate 10 is positioned between the bottoms of the 2 fourth dumbbell sheet supporting blocks 6, each fourth guide post 14 is provided with a spring and a limiting ring 21, the spring and the limiting ring 21 are both positioned between the fourth adjusting plate 10 and the support frame 1, and the spring and the limiting ring 21 are not on the same side; the second regulating plate 8 is positioned at the bottom of the first regulating plate 7, the third regulating plate 9 is positioned at the bottom of the second regulating plate 8, and the fourth regulating plate 10 is positioned at the bottom of the third regulating plate 9; first regulating plate 7 with be equipped with first control lever 16 between the long face of one side of support frame 1, second regulating plate 8 with be equipped with second control lever 17 between the long face of one side of support frame 1, third regulating plate 9 with be equipped with third control lever 18 between the long face of one side of support frame 1, fourth regulating plate 10 with be equipped with fourth control lever 19 between the long face of one side of support frame 1, just every control lever all is located support frame 1 is on the same long face of one side.

Preferably, 2 avoiding sliding

grooves

110, 4 trapezoidal

sliding grooves

111, and 4 screw holes 112 are symmetrically disposed on the upper surface of the supporting frame 1, each lateral long surface of the supporting frame 1 is symmetrically provided with 2 first guide

pillar fixing holes

101, 2 second guide

pillar fixing holes

102, 2 third guide

pillar fixing holes

103, and 2 fourth guide pillar fixing holes 104, and a middle portion of one lateral long surface is sequentially provided with a first control rod sliding hole 106, a second control rod sliding hole 107, a third control rod sliding hole 108, and a fourth control rod sliding hole 109 from top to bottom, and 2 cross sections of the supporting frame 1 are respectively provided with 4 screw holes 112.

Preferably, screw through holes 201 are respectively formed at 4 corners of the end cap 2, a fifth guide post fixing hole 105 is further formed in the end cap 2, and the fifth guide post fixing hole 105 is close to the upper portion of the end cap 2.

Preferably, an arc-shaped dumbbell sheet supporting surface 301 is arranged on the upper surface of the first dumbbell sheet supporting block 3, an arc-shaped dumbbell sheet fixing strip 302 is arranged on the dumbbell sheet supporting surface 301, the circle center of the dumbbell sheet fixing strip 302 is the same as that of the dumbbell sheet supporting surface 301, a dumbbell sheet positioning block 303 with a semicircular cross section is arranged at the lowest point of the dumbbell sheet supporting surface 301, and the dumbbell sheet positioning block 303 is intersected with the dumbbell sheet fixing strip 302; an adjusting

top block

305 and 2 trapezoidal sliding blocks 304 are arranged on the bottom surface of the first dumbbell sheet supporting block 3, the adjusting top block 305 is located in the middle of the bottom surface of the first dumbbell sheet supporting block 3, the 2 trapezoidal sliding blocks 304 are respectively located on two sides of the adjusting top block 305, and a fifth guide post sliding hole 306 is further formed in the adjusting top block 305; the lengths of the adjusting top blocks 305 in each dumbbell supporting block are different, the rest structures and the sizes are the same, the bottom of the adjusting top block 305 in the second dumbbell sheet supporting block 4 is longer than the bottom of the adjusting top block 305 in the first dumbbell sheet supporting block 3 by an adjusting plate thickness, the bottom of the adjusting top block 305 in the third dumbbell sheet supporting block 5 is longer than the bottom of the adjusting top block 305 in the second dumbbell sheet supporting block 4 by an adjusting plate thickness, and the bottom of the adjusting top block in the fourth dumbbell sheet supporting block 6 is longer than the bottom of the adjusting top block 305 in the third dumbbell sheet supporting block 5 by an adjusting plate thickness.

Preferably, the first adjusting plate 7 is of a symmetrical structure, 2 guide post sliding holes 701 are formed in the first adjusting plate 7, a first clamping surface 702 and a second clamping surface 703 are arranged on both side surfaces of the first adjusting plate 7, a 45-degree inclined surface 704 is arranged between the first clamping surface 702 and the second clamping surface 703, the first clamping surface 702 and the second clamping surface 703 are parallel to each other, and the vertical distance between the first clamping surface 702 and the second clamping surface 703 is greater than the thickness of the dumbbell sheet; the edge structures of the adjusting plates are the same, and the length of the second adjusting plate 8 is longer than that of the first adjusting plate 7 by the thickness of 2 dumbbell piece supporting blocks; the length of the third adjusting plate 9 is longer than that of the second adjusting plate 8 by the thickness of 2 dumbbell piece supporting blocks; the length of the fourth adjusting plate 10 is longer than that of the third adjusting plate 9 by the thickness of 2 dumbbell piece supporting blocks; when the first control lever 16 is pressed, the first regulating plate 7 will make all dumbbells slide outward, when the second control lever 17 is pressed, the second regulating plate 8 will make the second dumbbell plate 23, the third dumbbell plate 24 and the fourth dumbbell plate 25 slide outward, when the third control lever 18 is pressed, the third regulating plate 9 will make the third dumbbell plate 24 and the fourth dumbbell plate 25 slide outward, when the fourth control lever 19 is pressed, the fourth regulating plate 10 will make the fourth dumbbell plate 25 slide outward.

Preferably, the lower end of the dumbbell rod supporting plate 20 is provided with 2 screw through holes 201, the middle part of the upper end is provided with a U-shaped dumbbell rod supporting groove 2001, and the upper edges of the dumbbell rod supporting grooves 2001 are rounded; the dumbbell rod supporting groove 2001 functions to fit and position the dumbbell rod 26 in cooperation with the dumbbell rod positioning block 2603.

Preferably, the first dumbbell plate 22 is composed of two identical dumbbell half-edge plates connected by rivets, the first dumbbell piece 22 is circular, an annular clamping groove 2201 is arranged on the circumferential surface of the first dumbbell piece 22, a circular clamping pin sliding groove 2202 is arranged inside the first dumbbell piece, a spring action rod sliding groove 2205 and a push rod sliding groove 2204 are respectively arranged at the upper quadrant point and the lower quadrant point of the bayonet pin sliding groove 2202, and the push rod chute 2204 communicates the bayonet chute 2202 with the annular chute 2201, the bottommost part of the first dumbbell plate 22 is provided with a semicircular dumbbell plate positioning groove 2206, and the dumbbell piece positioning slot 2206 is positioned below the ejector

rod sliding groove

2204, 4 rivet through holes 2207 are further arranged on the first dumbbell piece 22 in an annular array, and the rivet via hole 2207 is located on the ring surface between the ring-shaped clamping groove 2201 and the clamping groove 2202, and the central axis of the first dumbbell plate 22 is further provided with a matching hole 2203.

Preferably, the dumbbell rod 26 is of a symmetrical structure, the two ends of the dumbbell rod 26 are sequentially provided with a first connecting handle 2601, a limiting plate 2602 and a dumbbell rod positioning block 2603 from outside to inside, the first connecting handle 2601 is provided with a first clamping hole 2604, the width of the dumbbell rod positioning block 2603 is the same as that of the dumbbell rod supporting groove 2001, and the outer diameter of the first connecting handle 2601 is the same as that of the matching hole 2203 in the first dumbbell piece 22.

Preferably, a second connecting handle 2301 is arranged at the central axis of the outer side surface of the second dumbbell sheet 23, the rest structures are the same as those of the first dumbbell sheet 22, the length of the second connecting handle 2301 is equal to the thickness of the second dumbbell sheet 23, a second clamping hole 2302 is arranged on the second connecting handle 2301, and the outer diameter of the second connecting handle 2301 is the same as the inner diameter of the first connecting handle 2601 in the dumbbell rod 26; a third connecting handle 2401 is arranged at the central axis of the outer side surface of the third dumbbell sheet 24, the rest structures are the same as those of the first dumbbell sheet 22, the length of the third connecting handle 2401 is equal to the thickness of the third dumbbell sheet 24, a third clamping hole 2402 is formed in the third connecting handle 2401, and the outer diameter of the third connecting handle 2401 is the same as the diameter of a matching hole 2203 in the second dumbbell sheet 23; a fourth connecting handle 2501 is arranged at the central axis of the outer side surface of the fourth dumbbell piece 25, the inside of the fourth connecting handle 2501 is of a solid structure, the rest structures of the fourth connecting handle 2501 are the same as those of the first dumbbell piece 22, the length of the fourth connecting handle 2501 is equal to the thickness of the fourth dumbbell piece 25, a fourth clamping hole 2502 is formed in the fourth connecting handle 2501, and the outer diameter of the fourth connecting handle 2501 is the same as the diameter of a matching hole 2203 in the third dumbbell piece 24.

Preferably, the inside of each of the first dumbbell piece 22, the second dumbbell piece 23, and the third dumbbell piece 24 is provided with a bayonet 27, the bayonet 27 is provided with a transmission ring 2701, the transmission ring 2701 is located in the bayonet sliding groove 2202, the upper quadrant point and the lower quadrant point of the transmission ring 2701 are respectively provided with a spring action rod 2704 and a push rod 2702, the push rod 2702 is located in the push rod sliding groove 2204, the lower end of the spring action rod 2704 is provided with a bayonet 2703, the upper end of the spring action rod 2704 is provided with a spring, and the spring action rod 2704 and the spring are both located in the spring action rod sliding groove 2205.

When the dumbbell piece positioning device is used, each dumbbell piece is placed on the corresponding dumbbell piece supporting block, the dumbbell piece positioning groove in each dumbbell piece is clamped on the dumbbell piece positioning block in the corresponding dumbbell piece supporting block, and at the moment, the annular clamping groove 2201 in each dumbbell piece is also clamped on the dumbbell piece fixing strip 302 in the corresponding dumbbell piece supporting block, so that the dumbbell pieces are balanced and cannot fall over; then, when the first control rod 16 is pressed, the first adjusting plate 7 can enable all dumbbells to slide towards the outer side, then the dumbbell rod 26 is placed between the 2 dumbbell rod supporting plates 20, the dumbbell rod positioning block 2603 is located in the dumbbell rod support 2001, then the first control rod 16 is released, all dumbbell pieces can return to the original position, and the first connecting handle 2601 in the dumbbell rod 26 is also connected with the first dumbbell piece 22; when only the first dumbbell sheet 22 is mounted on the dumbbell rod 26, only by pressing the second control rod 17, the second regulating plate 8 will make the second dumbbell sheet 23, the third dumbbell sheet 24 and the fourth dumbbell sheet 25 slide to the outside, then the dumbbell rod 26 is lifted, at this time, the first dumbbell sheet 22 will also be lifted along with the dumbbell rod 26, at the moment of lifting, the clamping bar 2703 in the first dumbbell sheet 22 will be clamped in the first clamping hole 2604 in the dumbbell rod 26, at this time, the first dumbbell sheet 22 will not slide out from the dumbbell rod 26, when it is put back to the original position, the second control rod 17 is pressed again, the second regulating plate 8 will make the second dumbbell sheet 23, the third dumbbell sheet 24 and the fourth dumbbell sheet 25 slide to the outside, then the first dumbbell sheet 22 can be put back to the original position, at this time, the fixing strip of the support block 3 in the first dumbbell sheet 3 will push the clamping bar 302 to separate the clamping bar 2703 from the first clamping hole 2604 in the dumbbell rod 26, at this time, the first dumbbell sheet 22 and the dumbbell rod 26 are in an unlocked state; when only the first dumbbell sheet 22 and the second dumbbell sheet 23 need to be mounted on the dumbbell bar 26, only the third control bar 18 needs to be pressed, the third regulating plate 9 will make the third dumbbell sheet 24 and the fourth dumbbell sheet 25 slide to the outside, then the dumbbell bar 26 is lifted, at the moment the first dumbbell sheet 22 and the second dumbbell sheet 23 will also be lifted along with the dumbbell bar 26, the clamping bar 2703 in the first dumbbell sheet 22 will be clamped in the first clamping hole 2604 in the dumbbell bar 26 and also in the second clamping hole 2302 in the second dumbbell sheet 23, at the moment of lifting, the first dumbbell sheet 22 and the second dumbbell sheet 23 will not slide out of the dumbbell bar 26, when the first dumbbell sheet 22 and the second dumbbell sheet 23 are to be put back to the original position, the third control bar 18 is pressed again, the third regulating plate 9 will make the third dumbbell sheet 24 and the fourth dumbbell sheet 25 slide to the outside, then the dumbbell sheets can be put back to the original position, at the moment, the clamping bar 302 in each dumbbell sheet pushes the corresponding dumbbell strip 27, each clamping rod 2703 is separated from each corresponding clamping hole, and at the moment, the adjacent dumbbell pieces or dumbbell rods 26 are in an unlocked state; when only the first, second and

third dumbbell plates

22, 23 and 24 are mounted on the dumbbell rod 26, only the fourth control rod 19 needs to be pressed, the fourth regulating plate 10 will make the fourth dumbbell plate 25 slide outward, then the dumbbell rod 26 is lifted, at this time, the first, second and

third dumbbell plates

22, 23 and 24 will also lift up along with the dumbbell rod 26, at the moment of lifting, the stem 2703 in the first dumbbell plate 22 will be blocked in the first blocking hole 2604 in the dumbbell rod 26 and also in the second blocking hole 2302 in the second dumbbell plate 23, the stem 2703 in the second dumbbell plate 23 will be blocked in the third blocking hole 2402 in the third dumbbell plate 24, at this time, the first, second and

third dumbbell plates

22, 23 and 24 will not slide out of the dumbbell rod 26, and when they are put back to their original positions, the fourth regulating plate 19 will be pressed again to control the fourth dumbbell plate 25 to slide outward, then, the dumbbell sheet fixing strip 302 in each dumbbell sheet supporting block can push the bayonet 27 in the corresponding dumbbell sheet to separate each bayonet 2703 from each corresponding bayonet hole, and at the moment, the adjacent dumbbell sheets or dumbbell rods 26 are in an unlocking state; when all the dumbbell pieces are to be lifted, only the dumbbell rod 26 needs to be lifted directly, and the principle is the same as the above.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various changes and modifications without departing from the inventive concept of the present invention, and all such changes and modifications are within the scope of the present invention.

Claims

1. A dumbbell weight adjusting device comprises a dumbbell and a dumbbell supporting device, and is characterized in that a dumbbell rod is arranged in the dumbbell, first dumbbell pieces are mounted at two ends of the dumbbell rod, a second dumbbell piece is mounted on the outer side surface of each first dumbbell piece in a clinging mode, a third dumbbell piece is mounted on the outer side surface of each second dumbbell piece in a clinging mode, and a fourth dumbbell piece is mounted on the outer side surface of each third dumbbell piece in a clinging mode; the dumbbell supporting device is provided with a supporting frame, two ends of the supporting frame are respectively provided with an end cover through screws, the upper surface of the supporting frame is symmetrically provided with 2 dumbbell supporting plates through screws, the upper surface of the supporting frame is also provided with 2 first dumbbell sheet supporting blocks, 2 second dumbbell sheet supporting blocks, 2 third dumbbell sheet supporting blocks and 2 fourth dumbbell sheet supporting blocks, one first dumbbell sheet supporting block is positioned beside the outer side surface of one dumbbell supporting plate, the other first dumbbell sheet supporting block is positioned beside the outer side surface of the other dumbbell supporting plate, one second dumbbell sheet supporting block is tightly attached to the outer side surface of one first dumbbell sheet supporting block, the other second dumbbell sheet supporting block is tightly attached to the outer side surface of the other first dumbbell sheet supporting block, one third dumbbell sheet supporting block is tightly attached to the outer side surface of one second dumbbell sheet supporting block, the other third dumbbell piece supporting block is tightly attached to the outer side face of the other second dumbbell piece supporting block, one fourth dumbbell piece supporting block is tightly attached to the outer side face of one third dumbbell piece supporting block, and the other fourth dumbbell piece supporting block is tightly attached to the outer side face of the other third dumbbell piece supporting block; a fifth guide pillar is arranged between each end cover and the supporting frame, each fifth guide pillar is respectively provided with a first dumbbell sheet supporting block, a second dumbbell sheet supporting block, a third dumbbell sheet supporting block and a fourth dumbbell sheet supporting block, adjacent dumbbell sheet supporting blocks on the same fifth guide pillar are in contact with each other, each fifth guide pillar is also provided with a spring, and the spring is arranged between the end cover on the same side and the fourth dumbbell sheet supporting block on the same side; 2 first guide pillars, 2 second guide pillars, 2 third guide pillars and 2 fourth guide pillars are further arranged between two long surfaces of the support frame, a first adjusting plate is jointly installed between the 2 first guide pillars, the first adjusting plate is located between the bottoms of the 2 first dumbbell sheet supporting blocks, a spring and a limiting ring are installed on each first guide pillar, the spring and the limiting ring are located between the first adjusting plate and the support frame and are not located on the same side, a second adjusting plate is jointly installed between the 2 second guide pillars, the second adjusting plate is located between the bottoms of the 2 second dumbbell sheet supporting blocks, a spring and a limiting ring are installed on each second guide pillar, the spring and the limiting ring are located between the second adjusting plate and the support frame and are not located on the same side, a third adjusting plate is jointly installed between the 2 third guide columns, the third adjusting plate is located between the bottoms of the 2 third dumbbell piece supporting blocks, a spring and a limiting ring are installed on each third guide column, the spring and the limiting ring are located between the third adjusting plate and the supporting frame, the spring and the limiting ring are not located on the same side, a fourth adjusting plate is jointly installed between the 2 fourth guide columns, the fourth adjusting plate is located between the bottoms of the 2 fourth dumbbell piece supporting blocks, the spring and the limiting ring are installed on each fourth guide column, the spring and the limiting ring are located between the fourth adjusting plate and the supporting frame, and the spring and the limiting ring are not located on the same side; the second adjusting plate is positioned at the bottom of the first adjusting plate, the third adjusting plate is positioned at the bottom of the second adjusting plate, and the fourth adjusting plate is positioned at the bottom of the third adjusting plate; a first control rod is arranged between the first adjusting plate and one long side of the support frame, a second control rod is arranged between the second adjusting plate and one long side of the support frame, a third control rod is arranged between the third adjusting plate and one long side of the support frame, a fourth control rod is arranged between the fourth adjusting plate and one long side of the support frame, and each control rod is positioned on the same long side of the support frame;

the dumbbell piece support block is characterized in that the first adjusting plate is of a symmetrical structure, 2 guide pillar sliding holes are formed in the first adjusting plate, a first clamping surface and a second clamping surface are arranged on two side surfaces of the first adjusting plate, a 45-degree inclined plane is formed between the first clamping surface and the second clamping surface, the first clamping surface and the second clamping surface are parallel to each other, and the vertical distance between the first clamping surface and the second clamping surface is larger than the thickness of the dumbbell piece support block; the edge structures of the adjusting plates are the same, and the length of the second adjusting plate is longer than that of the first adjusting plate by the thickness of 2 dumbbell piece supporting blocks; the length of the third adjusting plate is longer than that of the second adjusting plate by the thickness of 2 dumbbell piece supporting blocks; the length of the fourth adjusting plate is longer than that of the third adjusting plate by the thickness of 2 dumbbell piece supporting blocks.

2. The dumbbell weight adjusting device of claim 1, wherein 2 avoiding sliding grooves, 4 trapezoidal sliding grooves and 4 screw holes are symmetrically formed on the upper surface of the supporting frame, 2 first guide pillar fixing holes, 2 second guide pillar fixing holes, 2 third guide pillar fixing holes and 2 fourth guide pillar fixing holes are symmetrically formed on each side long surface of the supporting frame, a first control rod sliding hole, a second control rod sliding hole, a third control rod sliding hole and a fourth control rod sliding hole are sequentially formed in the middle of one side long surface from top to bottom, and 4 screw holes are respectively formed in 2 end surfaces of the supporting frame.

3. The dumbbell weight adjusting device of claim 1, wherein screw passing holes are formed at 4 corners of the end cap, and a fifth guide post fixing hole is formed on the end cap, and the fifth guide post fixing hole is close to the upper portion of the end cap.

4. The dumbbell weight adjusting device according to claim 1, wherein the upper surface of the first dumbbell sheet supporting block is provided with an arc-shaped dumbbell sheet supporting surface, an arc-shaped dumbbell sheet fixing strip is arranged on the dumbbell sheet supporting surface, the circle center of the dumbbell sheet fixing strip is the same as that of the dumbbell sheet supporting surface, a dumbbell sheet positioning block with a semicircular cross section is arranged at the lowest point of the dumbbell sheet supporting surface, and the dumbbell sheet positioning block intersects with the dumbbell sheet fixing strip; an adjusting top block and 2 trapezoidal sliding blocks are arranged on the bottom surface of the first dumbbell sheet supporting block, the adjusting top block is located in the middle of the bottom surface of the first dumbbell sheet supporting block, the 2 trapezoidal sliding blocks are located on two sides of the adjusting top block respectively, and a fifth guide pillar sliding hole is further formed in the adjusting top block; the adjusting top blocks in the dumbbell piece supporting blocks are different in length, the rest structures and the sizes are the same, the bottom of the adjusting top block in the second dumbbell piece supporting block is longer than the bottom of the adjusting top block in the first dumbbell piece supporting block by an adjusting plate thickness, the bottom of the adjusting top block in the third dumbbell piece supporting block is longer than the bottom of the adjusting top block in the second dumbbell piece supporting block by an adjusting plate thickness, and the bottom of the adjusting top block in the fourth dumbbell piece supporting block is longer than the bottom of the adjusting top block in the third dumbbell piece supporting block by an adjusting plate thickness.

5. The dumbbell weight adjusting device of claim 1, wherein the first adjusting plate is of a symmetrical structure, 2 guide post sliding holes are formed in the first adjusting plate, a first clamping surface and a second clamping surface are respectively formed on two side surfaces of the first adjusting plate, a 45-degree inclined surface is formed between the first clamping surface and the second clamping surface, the first clamping surface and the second clamping surface are parallel to each other, and the vertical distance between the first clamping surface and the second clamping surface is greater than the thickness of the dumbbell piece supporting block; the edge structures of the adjusting plates are the same, and the length of the second adjusting plate is longer than that of the first adjusting plate by the thickness of 2 dumbbell piece supporting blocks; the length of the third adjusting plate is longer than that of the second adjusting plate by the thickness of 2 dumbbell piece supporting blocks; the length of the fourth adjusting plate is longer than that of the third adjusting plate by the thickness of 2 dumbbell piece supporting blocks.

6. The dumbbell weight adjusting device of claim 1, wherein the dumbbell rod supporting plate is provided at a lower end thereof with 2 screw passing holes, and at a middle portion of an upper end thereof with a U-shaped dumbbell rod supporting groove, the upper edges of which are rounded.

7. The dumbbell weight adjustment device of claim 1, wherein the first dumbbell piece is composed of two identical dumbbell piece halves connected by rivets, the first dumbbell piece is round, the circumferential surface of the first dumbbell piece is provided with an annular clamping groove, the inside of the first dumbbell piece is provided with a round bayonet lock sliding groove, the upper quadrant point and the lower quadrant point of the bayonet lock sliding groove are respectively provided with a spring action rod sliding groove and a mandril sliding groove, the push rod chute communicates the bayonet pin chute with the annular chute, a semicircular dumbbell sheet positioning groove is arranged at the bottommost part of the first dumbbell sheet, and the dumbbell piece positioning groove is positioned below the ejector rod sliding groove, the first dumbbell piece is also provided with 4 rivet through holes in an annular array, and the rivet through hole is positioned on the annular surface between the annular clamping groove and the bayonet lock sliding groove, and a matching hole is also arranged at the central shaft of the first dumbbell plate.

8. The dumbbell weight adjusting device according to claim 1, 6 or 7, characterized in that the dumbbell rod is of a symmetrical structure, the two ends of the dumbbell rod are provided with a first connecting handle, a limiting plate and a dumbbell rod positioning block in sequence from outside to inside, the first connecting handle is provided with a first clamping hole, the width of the dumbbell rod positioning block is the same as that of the dumbbell rod supporting groove, and the outer diameter of the first connecting handle is the same as that of the matching hole in the first dumbbell sheet.

9. The dumbbell weight adjusting device according to claim 8, wherein a second connecting handle is provided at the central axis of the outer side surface of the second dumbbell piece, the rest of the structure is the same as that of the first dumbbell piece, the length of the second connecting handle is equal to the thickness of the second dumbbell piece, a second clamping hole is provided on the second connecting handle, and the outer diameter of the second connecting handle is the same as the inner diameter of the first connecting handle in the dumbbell rod; a third connecting handle is arranged at the central shaft of the outer side surface of the third dumbbell sheet, the rest structures of the third connecting handle are the same as those of the first dumbbell sheet, the length of the third connecting handle is equal to the thickness of the third dumbbell sheet, a third clamping hole is formed in the third connecting handle, and the outer diameter of the third connecting handle is the same as the diameter of a matching hole in the second dumbbell sheet; a fourth connecting handle is arranged at the central shaft of the outer side face of the fourth dumbbell piece, the inside of the fourth connecting handle is of a solid structure, the rest structures of the fourth connecting handle are the same as those of the first dumbbell piece, the length of the fourth connecting handle is equal to the thickness of the fourth dumbbell piece, a fourth clamping hole is formed in the fourth connecting handle, and the outer diameter of the fourth connecting handle is the same as the diameter of a matching hole in the third dumbbell piece.

10. The dumbbell weight adjusting device according to claim 9, wherein the first dumbbell piece, the second dumbbell piece and the third dumbbell piece are each internally provided with a bayonet lock, the bayonet lock is provided with a driving ring, the driving ring is located in a bayonet lock sliding groove, the upper quadrant point and the lower quadrant point of the driving ring are respectively provided with a spring action rod and an ejector rod, the ejector rod is located in an ejector rod sliding groove, the lower end of the spring action rod is provided with a bayonet lock, the upper end of the spring action rod is provided with a spring, and the spring action rod and the spring are both located in a spring action rod sliding groove.