CN112675476A

CN112675476A - Dumbbell flat plate horizontal pushing auxiliary device capable of changing weight

Info

Publication number: CN112675476A
Application number: CN202011571577.XA
Authority: CN
Inventors: 董玥
Original assignee: Nanjing Baibailai Medical Instrument Co ltd
Current assignee: Nanjing Baibailai Medical Instrument Co ltd
Priority date: 2020-12-27
Filing date: 2020-12-27
Publication date: 2021-04-20

Abstract

The invention discloses a dumbbell flat plate horizontal pushing auxiliary device capable of changing weight, which comprises a machine body, wherein the machine body is bilaterally symmetrically provided with working cavities, a driving motor is fixedly installed on the inner wall of the left side of the working cavity far away from one side, the tail end of a rotating sleeve of the driving motor is provided with a driving shaft extending leftwards and rightwards, two working cavities are internally provided with horizontal pushing auxiliary components for assisting people in preventing accidents caused by insufficient back force, when the device works, the horizontal pushing dumbbell can be continuously pushed by external force when people are subsequently powerless by the horizontal pushing auxiliary components to prevent the accidental falling off, the wrist posture can be fixedly corrected when people push the dumbbell horizontally by the wrist posture correcting component, the exercise effect is enhanced, the weight of the dumbbell can be adjusted by the dumbbell weight changing component, the exercise effect is improved, and the safety performance.

Description

Dumbbell flat plate horizontal pushing auxiliary device capable of changing weight

Technical Field

The invention relates to the field of fitness equipment, in particular to a dumbbell plate horizontal pushing auxiliary device with changeable weight.

Background

The dumbbell bench press is that the dumbbell is held by hand to be pushed upwards, two elbows are adducted, and the elbows and the chest are clamped simultaneously. The dumbbell is slightly inclined forwards while being upward, and the dumbbell takes a parabolic motion track. When the two arms are straightened, the gravity center of the dumbbell is close to the supporting point of the shoulder joint. People need both hands to hold the dumbbell and put on the knee then lie down when carrying out the bench press exercise usually, complex operation to easily utilize inertia to make the dumbbell be located the chest, in addition, when carrying out the bench press, people's wrist is easy to the head bending, and the exercise effect is relatively poor, and takes place the exhausted situation during the exercise and makes the dumbbell pound easily and fall, has certain danger.

Disclosure of Invention

Aiming at the technical defects, the invention provides the dumbbell plate horizontal pushing auxiliary device with the weight capable of being replaced, and the dumbbell plate horizontal pushing auxiliary device can overcome the defects.

The dumbbell flat plate horizontal pushing auxiliary device capable of changing weight comprises a machine body, wherein the machine body is symmetrically provided with working cavities at the left and right sides, a driving motor is fixedly installed on the inner wall of the far side of the left working cavity, the tail end of a rotating sleeve of the driving motor is provided with a driving shaft extending at the left and right sides, horizontal pushing auxiliary assemblies for assisting people in preventing accidents caused by insufficient back force are arranged in the two working cavities, each horizontal pushing auxiliary assembly comprises a connecting shaft which is rotatably installed on the inner wall of the top side of the working cavity and extends up and down, the connecting shaft is in transmission connection with the driving shaft through a bevel gear pair, a lifting box is vertically and slidably installed on the far side of the working cavity, a displacement block is vertically and slidably installed on the far side of the working cavity, a displacement groove is formed in the displacement block, and a butting spring capable of being abutted against the lifting box is, the tail end of the butt spring is provided with a butt plate fixedly installed on the inner wall of the bottom side of the displacement tank, the working chamber is far away from the inner wall of one side and is provided with a movable plate in a vertical sliding mode, the displacement block is internally and spirally connected with a movable shaft extending vertically, the movable shaft is in spline fit with a movable sleeve rotatably installed on the movable plate, the movable sleeve is fixedly connected with a movable gear, the connecting shaft is fixedly connected with a connecting gear capable of being in meshing connection with the movable gear, the inner wall of the bottom side of the working chamber is fixedly provided with a hydraulic telescopic rod fixedly connected with the movable plate, the inner wall of the top side of the working chamber is rotatably or horizontally slidably installed with a rotating shaft extending vertically, the inner wall of the bottom side of the working chamber is rotatably or horizontally slidably installed with a rotating belt wheel rotatably matched with the rotating shaft, and the, a rotating gear which can be engaged with the rotating belt wheel is fixedly connected to the driven sleeve, the connecting shaft is fixedly connected with a connecting belt wheel, the connecting belt wheel is in transmission connection with the rotating belt wheel through a belt capable of being tightened, an annular groove is arranged in the rotating gear, the inner wall of the working cavity far away from one side is provided with a connecting plate in a vertical sliding way, a sliding groove is arranged in the connecting plate, a rotating sleeve which is in rotating or sliding connection with the sliding groove is matched with the driven sleeve through splines, the lower end of the rotating sleeve is fixedly provided with a clamping block for clamping a dumbbell, a dumbbell shaft with a groove is fixedly clamped on the clamping block, the wrist posture correcting component is arranged in the working cavity and used for enabling the wrist to vertically prevent the wrist from tilting backwards when the user pushes down on the wrist, and the dumbbell weight replacing component is further arranged in the working cavity and used for adjusting the weight of the dumbbell.

Preferably, bench press auxiliary assembly still include with linking up fishplate bar upper end fixed connection's main push rod, be provided with in the organism wall body contain hydraulic oil and one end with main push rod sliding connection's ripple oil pipe, ripple oil pipe can stretch out and draw back, ripple oil pipe other end slidable mounting have with ring channel sliding fit's follow push rod, link up the fishplate bar with lift case fixed connection, link up epaxial spline fit have with the lift case rotates the linking sleeve of installation, the epaxial restriction board that can sliding fit restriction balancing piece of dumbbell, the restriction board can adsorb the balancing weight.

Preferably, the wrist posture correcting component comprises a screw shaft which is rotatably installed on the rear side wall body of the lifting box and extends forwards and backwards, the screw shaft is in transmission connection with the linking sleeve through a bevel gear pair, the screw shaft is in threaded connection with a main correcting plate in sliding fit with the working cavity far away from the front inner wall and the back inner wall of one side, the screw shaft is in threaded connection with a secondary correcting plate in sliding fit with the working cavity far away from the front inner wall and the back inner wall of one side, and the main correcting plate and the secondary correcting plate can correct the posture of the wrist of people.

Preferably, the dumbbell weight replacing component comprises a balancing weight box containing balancing weights and arranged on the inner walls of the front side and the rear side of the working cavity, adjusting motors are symmetrically arranged on the inner walls of the front side and the rear side of the working cavity, the tail ends of the adjusting motors are provided with adjusting shafts extending forwards and backwards, the adjusting shafts are in threaded connection with threaded blocks which are slidably mounted on the inner wall of the side opposite to the working cavity, the threaded blocks can be in adsorption fit with downward threaded blocks, the inner wall of the side, away from the side of the balancing weight box, of the balancing weight box is provided with a jacking spring abutted against the balancing weights, the inner wall of the top side of the balancing weight box is fixedly provided with an electric expansion plate for recovering the balancing weights, a transmission groove is formed in the balancing weight box, a connecting groove is formed in the lifting box, an input, the input shaft is fixedly connected with an input belt pulley, an output shaft is rotatably arranged between the inner walls of the transmission groove, an output belt pulley is fixedly connected with the output shaft, the output belt pulley is in transmission connection with a conveyor belt which can be loosened through tensioning between the input belt pulley and the input belt pulley, a through hole is arranged below the balancing weight box, a stop block which can block the through hole is slidably arranged in the transmission groove, a reel is fixedly connected with the output shaft and is fixedly connected with the left end of the stop block, linking grooves are symmetrically arranged in the limiting plate, linking top plates are slidably arranged in the linking grooves up and down, linking springs fixedly arranged on the inner walls of the linking grooves are arranged at the tail ends of the linking top plates, transition grooves are arranged in the linking top plates, transition top plates are slidably arranged in the transition grooves, and transition springs fixedly arranged on the inner walls of the transition grooves are, the connecting top plate and the transition top plate can clamp the dumbbell shaft to prevent the counterweight blocks from moving.

The invention has the beneficial effects that: the device during operation can continue the bench press dumbbell through the auxiliary assembly that bench presses when people follow-up weak external force and prevent that the accident from droing, fixes and corrects the wrist posture when making people bench press through wrist posture correction component, and the effect is tempered in the reinforcing, can adjust dumbbell weight through dumbbell weight change subassembly, has improved the exercise effect, has strengthened the security performance.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the structure A-A of FIG. 1;

FIG. 3 is an enlarged schematic view of B of FIG. 2;

FIG. 4 is an enlarged schematic view of C in FIG. 1;

fig. 5 is a schematic structural view of the limiting plate of fig. 2.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

The invention will now be described in detail with reference to fig. 1-5, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

The dumbbell flat plate horizontal pushing auxiliary device capable of changing weight comprises a machine body 11, wherein working cavities 12 are symmetrically arranged on the left side and the right side of the machine body 11, a driving motor 13 is fixedly installed on the inner wall of the left side of the working cavity 12 far away from one side, a driving shaft 14 extending left and right is arranged at the tail end of a rotating sleeve 32 of the driving motor 1, horizontal pushing auxiliary components for assisting people in preventing accidents caused by insufficient back force are arranged in the two working cavities 12, the horizontal pushing auxiliary components comprise linking shafts 16 which are rotatably installed on the inner wall of the top side of the working cavity 12 and extend up and down, the linking shafts 16 are in transmission connection with the driving shaft 14 through bevel gear pairs, a lifting box 18 is installed on the side of the working cavity 12 far away from one side in a vertical sliding mode, a displacement block 19 is installed on the side of the working cavity 12 far away from one side in a vertical, displacement groove 20 upper and lower slidable mounting have can with the butt spring 22 of lift case 18 butt, butt spring 22 end be provided with displacement groove 20 bottom side inner wall fixed mounting's butt board 21, one side inner wall is kept away from to working chamber 12 upper and lower slidable mounting has movable plate 25, 19 female connection of displacement piece has the removal axle 23 of extending from top to bottom, spline fit has on the removal axle 23 with movable plate 25 rotates the removal sleeve 24 of installation, fixedly connected with removal gear 26 on the removal sleeve 24, fixedly connected with on the joining axle 16 can with the linking gear 39 that removes gear 26 meshing is connected, working chamber 12 bottom side inner wall fixed mounting have with movable plate 25 fixed connection's hydraulic telescoping rod 15, working chamber 12 top side inner wall rotates or the side-to-side slidable mounting has the axis of rotation 34 of extending from top to bottom, working chamber 12 bottom side inner wall rotates or the side-to-side slidable mounting can with axis of rotation 34 normal running fit The wrist posture correcting device comprises a rotating belt wheel 33, a driven sleeve 35 is connected to the rotating shaft 34 through a spline, a rotating gear 36 capable of being in meshing connection with the rotating belt wheel 33 is fixedly connected to the driven sleeve 35, a connecting belt wheel 31 is fixedly connected to the connecting shaft 16, the connecting belt wheel 31 is in transmission connection with the rotating belt wheel 33 through a belt capable of being tightened, an annular groove 37 is formed in the rotating gear 36, a connecting plate 27 is vertically and slidably mounted on the inner wall of one side, far away from the working cavity 12, of the working cavity, a sliding groove 28 is formed in the connecting plate 27, a rotating sleeve 32 in rotating or sliding connection with the sliding groove 28 is in spline fit with the driven sleeve 35, a clamping block 43 used for clamping a dumbbell is fixedly mounted at the lower end of the rotating sleeve 32, a dumbbell shaft 44 with a groove is fixedly clamped on the clamping block 43, and a wrist posture correcting component for vertically preventing the wrist from being tilted backwards when the wrist is pushed horizontally, a dumbbell weight replacing component for adjusting the weight of the dumbbell is also arranged in the working cavity 12.

Beneficially, the bench press auxiliary assembly further comprises a main push rod 29 fixedly connected with the upper end of the connecting plate 27, a corrugated oil pipe 30 filled with hydraulic oil and having one end slidably connected with the main push rod 29 is arranged in the wall body of the machine body 11, the corrugated oil pipe 30 can stretch out and draw back, a secondary push rod 38 slidably matched with the annular groove 37 is installed at the other end of the corrugated oil pipe 30, the connecting plate 27 is fixedly connected with the lifting box 18, a connecting sleeve 17 rotatably installed with the lifting box 18 is in spline fit on the connecting shaft 16, a limiting plate 61 capable of slidably matching with a limiting weight is arranged on the dumbbell shaft 44, the limiting plate 61 can adsorb the weight, when the machine body 11 is laid down at the beginning of exercise, the dumbbell shaft 44 is held by two hands, the connecting shaft 16 is started, so that the connecting shaft 16 is driven to rotate through bevel gear pair transmission, thereby rotating the rotating pulley 33 via the engaging pulley 31, rotating the rotating gear 36 via the rotating pulley 33, rotating the clamping block 43 ninety degrees via the rotating sleeve 32, directing the wrists to the sight direction, activating the hydraulic telescopic rod 15, moving the moving plate 25 to engage the moving gear 26 with the engaging gear 39, moving the lifting box 18 upward a distance via the displacement block 19, moving the clamping block 43 upward a distance via the engaging plate 27, moving the main push rod 29 upward to change the level of the hydraulic oil in the bellows oil pipe 30, moving the sub push rod 38 downward to disengage the rotating pulley 33 from the rotating gear 36, and turning off the driving motor 13 during the bench press, when a person feels weakness later, the driving motor 13 is started again, so that the engaging gear 39 drives the driving gear 26 to rotate, the moving shaft 23 drives the displacement block 19 to move upwards, the abutting spring 22 abuts against the lifting box 18 again, the engaging plate 27 drives the sliding chute 28 to move upwards, the clamping block 43 drives the dumbbell to continuously lift and push for the auxiliary force of the person doing training, the driving motor 13 is started to rotate reversely when the dumbbell is reset, and the abutting plate 21 is used for slowly resetting the dumbbell.

Advantageously, the wrist posture correcting assembly comprises a screw shaft 40 rotatably mounted on the rear side wall of the lifting box 18 and extending forward and backward, the screw shaft 40 is in transmission connection with the engaging sleeve 17 through a bevel gear pair, a primary correcting plate 41 in forward and backward sliding fit with the inner wall of the working chamber 12 on the far side is in threaded connection with the screw shaft 40, a secondary correcting plate 42 in forward and backward sliding fit with the inner wall of the working chamber 12 on the far side is in threaded connection with the screw shaft 40, and the primary correcting plate 41 and the secondary correcting plate 42 can correct the posture of the wrist of a person.

Beneficially, the dumbbell weight replacing assembly comprises a balancing weight box 45 containing balancing weights and arranged on the inner walls of the front side and the rear side of the working cavity 12, adjusting motors 47 are symmetrically arranged on the inner walls of the front side and the rear side of the working cavity 12, adjusting shafts 68 extending forwards and backwards are arranged at the tail ends of the adjusting motors 47, a threaded block 49 slidably mounted on the inner wall of the side opposite to the working cavity 12 is connected onto the adjusting shafts 68 in a threaded manner, the threaded block 49 can be in adsorption fit with the downward threaded block 49, a top pressure spring 46 abutted against the balancing weights is arranged on the inner wall of the side far away from the balancing weight box 45, an electric expansion plate 60 used for recovering the balancing weights is fixedly mounted on the inner wall of the top side of the balancing weight box 45, a transmission groove 50 is arranged in the balancing weight box 45, a connecting groove 56 is arranged in the lifting box 18, input shafts 57 are rotatably mounted on the inner walls of, the utility model discloses a quick-witted, including input shaft 57, driving groove 50, be provided with through-hole 51 below balancing weight case 45, fixedly connected with output pulley 55 on the output shaft 53, output pulley 55 with the transmission belt transmission that can relax through the tensioning between input pulley 59 is connected, balancing weight case 45 is provided with through-hole 51 in the rotation between the inner wall, sliding mounting has the dog 52 that can block up through-hole 51 in the driving groove 50, fixedly connected with reel 54 on the output shaft 53, reel 54 with dog 52 left end fixed connection, the symmetry is provided with in the restriction board 61 links up groove 62, sliding mounting has linking roof 63 from top to bottom in linking groove 62, linking roof 63 end be provided with link up spring 64 that links up groove 62 inner wall fixed mounting, be provided with transition groove 65 in linking roof 63, sliding mounting has transition roof 66 in transition groove 65, the end of the transition top plate 66 is provided with a transition spring 67 fixedly mounted with the inner wall of the transition groove 65, and the connecting top plate 63 and the transition top plate 66 can clamp the dumbbell shaft 44 to prevent the counterweight block from moving.

The use steps herein are described in detail below with reference to fig. 1-5:

in the initial state, the moving gear 26 is not engaged with the main push rod 29, the rotating pulley 33 is engaged with the rotating gear 36, and the biasing spring 46 is in a compressed state.

When starting to exercise, the user lies on the machine body 11, holds the dumbbell shaft 44 with both hands facing each other, starts the engaging shaft 16, rotates the engaging shaft 16 by the bevel gear pair transmission, rotates the rotating pulley 33 by the engaging pulley 31, rotates the rotating gear 36 by the rotating pulley 33, rotates the driven sleeve 35, rotates the holding block 43 by the rotating sleeve 32 by ninety degrees, directs the wrists of both hands toward the visual line direction, rotates the screw shaft 40 by the bevel gear pair transmission, moves the primary correction plate 41 and the secondary correction plate 42 relative to each other, fixes the posture of the correction wrist by the cooperation of the primary correction plate 41 and the secondary correction plate 42, starts the hydraulic telescopic rod 15, moves the moving gear 26 to engage with the engaging gear 39 by the movement of the moving plate 25, and moves the lifting box 18 by the displacement block 19 by a distance upward, thereby driving the clamping block 43 to move upwards for a certain distance through the connecting plate 27, thereby driving the slave push rod 38 to move downwards to separate the rotating belt wheel 33 from the rotating gear 36, so that the clamping block 43 does not rotate any more, when people carry out the horizontal push, the driving motor 13 is closed, when people carry out the horizontal push, the hand-held dumbbell is pushed upwards, two elbows are closed, the chest is clamped while the elbows are clamped, the dumbbell is slightly deflected forwards while the elbows are clamped, the gravity center of the dumbbell is close to the supporting point of the shoulder joint when the two arms are straightened, at the time, the abutting spring 22 is separated from the lifting box 18 during the horizontal push, when people feel subsequent weakness, the driving motor 13 is started again, thereby the dumbbell is driven to rotate the moving gear 26 through the connecting gear 39, thereby the moving shaft 23 is rotated to drive the moving block 19 to move upwards, thereby the abutting spring 22 is abutted to the lifting box 18 again, the connecting plate 27 drives the sliding groove 28 to move upwards, so that the dumbbell is driven by the clamping block 43 to continuously ascend and lie down, the dumbbell is prevented from falling off accidentally by the aid of auxiliary force of a training person, the driving motor 13 is started to rotate reversely during resetting, and the dumbbell is slowly reset through the abutting plate 21; when the clump weight needs to be added, the device is reset, the adjusting motor 47 is started to rotate forwards, so that the thread block 49 and the limiting plate 61 are adsorbed by the relative motion of the thread block 49, the adjusting motor 47 is started to rotate backwards, so that the thread block 49 drives the limiting plate 61 to move towards the direction far away from one side by rotating the adjusting shaft 68, when the limiting plate 61 is meshed with the input gear 58, the input gear 58 is driven to rotate by the limiting plate 61, the output belt wheel 55 is driven to rotate by the input belt wheel 59, the stop block 52 box transmission groove 50 is driven to move inwards by the rotation of the winding wheel 54, so that the through hole 51 is smooth, so that one clump weight in the clump weight box 45 is adsorbed by the limiting plate 61 through the through hole 51, the adjusting motor 47 is started again, so that the clump weight is installed, when the clump weight is to be detached, the adjusting motor 47 is started, after that, the electric expansion plate 60 is started, so that the counterweight block is retracted by extending the electric expansion plate 60, and when the bench press is performed, the stopper 52 is closed to prevent accidents because the conveyor belt connected with the input belt wheel 59 and the output belt wheel 55 is in a relaxed state.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a dumbbell flat plate bench press auxiliary device that can change weight, includes the organism, its characterized in that: the machine body is provided with working chambers in bilateral symmetry, a driving motor is fixedly mounted on the inner wall of the left side of the working chamber far away from one side, a driving shaft extending leftwards and rightwards is arranged at the tail end of a rotating sleeve of the driving motor, two horizontal pushing auxiliary assemblies for assisting people in horizontal pushing to prevent back force insufficiency from causing accidents are arranged in the working chambers, each horizontal pushing auxiliary assembly comprises a linking shaft which is rotatably mounted on the inner wall of the top side of the working chamber and extends upwards and downwards, the linking shafts are connected with the driving shaft through bevel gear pair transmission, a lifting box is vertically and slidably mounted on the far side of the working chamber, a displacement block is vertically and slidably mounted on the far side of the working chamber, a displacement groove is arranged in the displacement block, a butt spring capable of being abutted against the lifting box is vertically and slidably mounted in the displacement groove, and a butt plate fixedly mounted on the, the movable plate is arranged on the inner wall of one side of the working cavity far away from the movable plate in a vertical sliding manner, a moving shaft extending vertically is connected with the inner thread of the displacement block, a moving sleeve rotatably arranged on the moving shaft is in spline fit with the moving plate, a moving gear is fixedly connected on the moving sleeve, a linking gear capable of being in meshing connection with the moving gear is fixedly connected on the linking shaft, a hydraulic telescopic rod fixedly connected with the moving plate is fixedly arranged on the inner wall of the bottom side of the working cavity, a rotating shaft extending vertically is arranged on the inner wall of the top side of the working cavity in a rotating or left-right sliding manner, a rotating belt wheel capable of being in rotating fit with the rotating shaft is arranged on the inner wall of the bottom side of the working cavity in a rotating or left-right sliding manner, a driven sleeve is in spline connection with the rotating shaft, and a, fixedly connected with links up the band pulley on linking up the epaxial, link up the band pulley with it connects through the belt drive that can tighten to rotate the band pulley, be provided with the ring channel in the rolling gear, sliding mounting has a linking plate about one side inner wall is kept away from to the working chamber, be provided with the spout in the linking plate, spline fit has on the driven sleeve with spout rotation or sliding connection's rotating sleeve, rotating sleeve lower extreme fixed mounting has the grip block that is used for centre gripping dumbbell, fixed centre gripping has the mute axle with the recess on the grip block, be provided with in the working chamber and be used for making the wrist vertical prevent the wrist posture correction subassembly that the wrist from upwarping backward when bench press, still be provided with in the working chamber and be used for changing the subassembly to dumbbell weight regulation.

2. The dumbbell plate bench press auxiliary device capable of changing weight of claim 1, characterized in that: the bench press auxiliary assembly still include with linking up fishplate bar upper end fixed connection's main push rod, be provided with in the organism wall body contain hydraulic oil and one end with main push rod sliding connection's ripple oil pipe, ripple oil pipe can stretch out and draw back, ripple oil pipe other end slidable mounting have with ring channel sliding fit from the push rod, link up the fishplate bar with lift case fixed connection, link up epaxial spline fit have with the lift case rotates the linking sleeve of installation, the epaxial restriction board that can sliding fit restriction balancing piece of dumbbell, the restriction board can adsorb the balancing weight.

3. The dumbbell plate bench press auxiliary device capable of changing weight of claim 2, characterized in that: the wrist posture correction assembly comprises a screw shaft which is rotatably installed on the rear side wall body of the lifting box and extends forwards and backwards, the screw shaft is connected with the linking sleeve through a bevel gear pair in a transmission mode, a main correction plate in sliding fit with the working cavity far away from the inner wall on one side is in threaded connection with the screw shaft, a secondary correction plate in sliding fit with the working cavity far away from the inner wall on one side is in threaded connection with the screw shaft, and the main correction plate and the secondary correction plate can correct the posture of the wrist of people.

4. The dumbbell plate bench press auxiliary device that can change weight of claim 3, characterized in that: the dumbbell weight replacing component comprises a balancing weight box containing balancing weights and arranged on the inner walls of the front side and the rear side of the working cavity, adjusting motors are symmetrically arranged on the inner walls of the front side and the rear side of the working cavity, the tail ends of the adjusting motors are provided with adjusting shafts extending forwards and backwards, the adjusting shafts are in threaded connection with threaded blocks which are slidably mounted on the inner wall of the side opposite to the working cavity, the threaded blocks can be in adsorption fit with downward threaded blocks, the inner wall of the side far away from the balancing weight box is provided with a jacking spring abutted against the balancing weights, the inner wall of the top side of the balancing weight box is fixedly provided with an electric expansion plate used for recovering the balancing weights, a transmission groove is formed in the balancing weight box, a connecting groove is formed in the lifting box, an input shaft is rotatably arranged on the inner, the input shaft is fixedly connected with an input belt pulley, an output shaft is rotatably arranged between the inner walls of the transmission groove, an output belt pulley is fixedly connected with the output shaft, the output belt pulley is in transmission connection with a conveyor belt which can be loosened through tensioning between the input belt pulley and the input belt pulley, a through hole is arranged below the balancing weight box, a stop block which can block the through hole is slidably arranged in the transmission groove, a reel is fixedly connected with the output shaft and is fixedly connected with the left end of the stop block, linking grooves are symmetrically arranged in the limiting plate, linking top plates are slidably arranged in the linking grooves up and down, linking springs fixedly arranged on the inner walls of the linking grooves are arranged at the tail ends of the linking top plates, transition grooves are arranged in the linking top plates, transition top plates are slidably arranged in the transition grooves, and transition springs fixedly arranged on the inner walls of the transition grooves are, the connecting top plate and the transition top plate can clamp the dumbbell shaft to prevent the counterweight blocks from moving.