CN216022927U

CN216022927U - High-tension dorsal muscle trainer for physical education

Info

Publication number: CN216022927U
Application number: CN202120430984.2U
Authority: CN
Inventors: 张芸
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-01
Filing date: 2021-03-01
Publication date: 2022-03-15
Anticipated expiration: 2031-03-01

Abstract

The application discloses sports teaching is with high tension dorsal muscle training ware, including supporting seat, rubber pad, U type frame, balancing weight, stay cord, pull rod, bracing piece, T type groove, rack one, rack two, spring one, fastening bolt, drum, cylinder piece, slider, L type groove, draw-in groove, spring two, circle piece, semi-ring briquetting, movable block, guide arm, spring three, stop bolt, magnetic ring and nut. This application installs T type piece in T type inslot portion, T type piece removes and drives rack one and remove, rack one removes and extrudees rack two, make rack two remove and extrude spring one, when rack one removes and aligns with rack two meshing, under the effect of spring elasticity, rack two remove and rack one re-engage, when the rubber pad removes and pastes with the supporting seat top completely, twist fastening bolt, make fastening bolt remove and laminate with rack two along the screw hole, and then avoid rack two to take place to remove, and then with T type piece joint in T type inslot portion.

Description

High-tension dorsal muscle trainer for physical education

Technical Field

The application relates to a high-tension dorsal muscle trainer, in particular to a high-tension dorsal muscle trainer for physical education.

Background

The dorsal muscles are divided into the superficial dorsal muscle, the deep dorsal muscle and the dorsal fascia. The superficial dorsal muscles are divided into two layers, both of which originate from different parts of the spinal column and terminate in the upper limb with bones or free upper limb bones. The deep dorsal muscles are arranged on both sides of the spine and are divided into long and short muscles.

High tension dorsal muscle training ware that traditional used has certain defect, lacks the convenient installation mechanism of rubber pad, causes inconveniently to change the maintenance to the rubber pad, lacks coupling mechanism simultaneously, causes inconveniently with stay cord bottom fixed mounting on the balancing weight, lacks latch mechanism, causes inconveniently with the stay cord other end and pull rod fixed connection, and then inconvenient carries out the dismouting to the pull rod and maintains. Therefore, a high-tension dorsal muscle trainer for physical education is provided for solving the problems.

SUMMERY OF THE UTILITY MODEL

A high-tension dorsal muscle trainer for physical education comprises a supporting seat, a rubber pad, a U-shaped frame, a balancing weight, a pull rope, a pull rod, a supporting rod, an installing mechanism, a connecting mechanism and a clamping mechanism, wherein the rubber pad is assembled at the top end of the supporting seat;

the mounting mechanism comprises a T-shaped block, a T-shaped groove, a first rack, a second rack and a first spring, the T-shaped block is fixedly mounted at the bottom end of a rubber pad of the T-shaped block, the T-shaped groove is formed in the middle of the top end of the supporting seat, the T-shaped block is mounted inside the T-shaped groove, the first rack is fixedly mounted at the right end of the T-shaped block, two grooves are symmetrically formed in the T-shaped groove, the second rack is fixedly mounted inside the grooves, and the left end of the second rack is meshed with the right end of the first rack;

the connecting mechanism comprises a cylinder, a cylindrical block, a sliding block, L-shaped grooves, a clamping groove and a second spring, the cylinder is fixedly arranged at the middle position of the top end of the balancing weight, the cylindrical block is fixedly arranged at the bottom end of the pull rope, the cylindrical block is arranged inside the cylinder, the two sliding blocks are symmetrically and fixedly arranged on the annular side surface of the cylindrical block, the two L-shaped grooves are symmetrically formed inside the cylinder, the sliding blocks are arranged inside the L-shaped grooves, the clamping groove is formed in the top end of the inside of the L-shaped groove, the second spring is fixedly arranged at the bottom end of the inside of the cylinder, and the top ends of the two springs are attached to the bottom end of the cylindrical block;

clamping mechanism includes disk, semi-ring briquetting, movable block, guide arm, three and spacing bolt of spring, the stay cord is close to pull rod one end fixed mounting and has the disk, and the disk installs on the pull rod, two rectangular channels are seted up to the symmetry on the pull rod annular side, and two rectangular channel symmetries are seted up in the disk left and right sides, the inside fixed mounting of rectangular channel has the guide arm, install movable block and spring three on the guide arm annular side, and three both ends of spring fixed mounting respectively on the movable block and on the rectangular channel inner wall, movable block top fixed mounting has the semi-ring briquetting, and semi-ring briquetting bottom and pull rod top and disk top are laminated mutually, spacing bolt is installed on semi-ring briquetting top, and spacing bolt bottom passes semi-ring briquetting fixed mounting on the disk.

Furthermore, two T-shaped blocks are symmetrically and fixedly installed at the bottom end of the rubber pad, and the two T-shaped blocks are aligned front and back at the bottom end of the rubber pad.

Furthermore, two fastening bolts are symmetrically installed at the right end of the supporting seat, and one ends of the fastening bolts extend to the inside of the grooves and are aligned with the second rack left and right.

Furthermore, the L-shaped groove is composed of a vertical groove and a transverse groove, the two vertical grooves and the two transverse grooves are symmetrically formed in the cylinder, the bottom end of each vertical groove is communicated with the corresponding transverse groove, the top end of the inner portion of each transverse groove is provided with a clamping groove, and the size of the cross section of each clamping groove is the same as that of the cross section of the sliding block.

Furthermore, a magnetic ring is fixedly mounted at the other end inside the rectangular groove and is fixedly mounted on the outer side of the annular side face of the guide rod.

Furthermore, a round hole is formed in the top end of the semi-ring pressing block, a limiting bolt is arranged inside the round hole, a nut is arranged on the annular side face of the limiting bolt, and the outer side of the nut is fixedly arranged inside the round block.

Furthermore, a circular through hole is formed in one end of the moving block, a guide rod is arranged in the circular through hole, more than two balls are uniformly arranged in the circular through hole, and the spherical side face of each ball is attached to the annular side face of the guide rod.

Furthermore, the supporting rod is fixedly installed on the supporting seat through a first bolt, and the U-shaped frame is fixedly installed on the supporting seat through a second bolt.

Further, both ends symmetry fixed mounting has the square about the balancing weight, the bar groove has been seted up to the symmetry on the inside left and right sides wall of U type frame, square slidable mounting is in the bar inslot portion.

Furthermore, two threaded holes are symmetrically formed in the right end of the supporting seat, one end of each threaded hole is communicated with the corresponding groove, and a fastening bolt is installed inside each threaded hole.

The beneficial effect of this application is: the application provides a sports teaching is with high tension dorsal muscles training ware with convenient dismouting rubber pad and pull rod, convenient with stay cord fixed mounting function on the balancing weight.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a schematic overall structure diagram of an embodiment of the present application;

FIG. 2 is a schematic structural view of a mounting mechanism according to an embodiment of the present application;

FIG. 3 is an enlarged view of a portion of one embodiment of the present application at A;

FIG. 4 is a schematic view of a coupling mechanism according to an embodiment of the present application;

FIG. 5 is a schematic structural view of a clamping mechanism according to an embodiment of the present application;

fig. 6 is a schematic view of an assembly structure of a half-ring pressing block and a round block according to an embodiment of the present application.

In the figure: 1. the support seat, 2, a rubber pad, 3, a U-shaped frame, 4, a balancing weight, 5, a pull rope, 6, a pull rod, 7, a support rod, 8, a T-shaped block, 9, a T-shaped groove, 10, a first rack, 11, a second rack, 12, a first spring, 13, a fastening bolt, 14, a cylinder, 15, a cylinder block, 16, a sliding block, 17, an L-shaped groove, 18, a clamping groove, 19, a second spring, 20, a round block, 21, a semi-ring pressing block, 22, a moving block, 23, a guide rod, 24, a third spring, 25, a limiting bolt, 26, a magnetic ring, 27 and a nut.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1-6, a high-tension dorsal muscle trainer for physical education comprises a support seat 1, a rubber pad 2, a U-shaped frame 3, a counterweight block 4, a pull rope 5, a pull rod 6, a support rod 7, an installation mechanism, a connection mechanism and a clamping mechanism, wherein the rubber pad 2 is assembled at the top end of the support seat 1, the U-shaped frame 3 is fixedly installed at the rear side of the top end of the support seat 1, the counterweight block 4 is slidably installed inside the U-shaped frame 3, the support rod 7 is fixedly installed at the top end of the support seat 1, the support rod 7 is located between the rubber pad 2 and the U-shaped frame 3, the pull rope 5 is fixedly installed at the top end of the counterweight block 4, and the other end of the pull rope 5 penetrates through the U-shaped frame 3 and the support rod 7 and is fixedly installed on the pull rod 6;

the installation mechanism comprises a T-shaped block 8, a T-shaped groove 9, a first rack 10, a second rack 11 and a first spring 12, the T-shaped block 8 is fixedly installed at the bottom end of a rubber pad 2 of the T-shaped block 8, the T-shaped groove 9 is formed in the middle position of the top end of the supporting seat 1, the T-shaped block 8 is installed inside the T-shaped groove 9, the first rack 10 is fixedly installed at the right end of the T-shaped block 8, two grooves are symmetrically formed in the T-shaped groove 9, the second rack 11 is fixedly installed inside the grooves, the left end of the second rack 11 is meshed with the right end of the first rack 10, the T-shaped block 8 is installed inside the T-shaped groove 9, the first rack 10 is driven to move by the movement of the T-shaped block 8, the second rack 11 is extruded by the movement of the first rack 10, the second rack 11 is extruded to the first spring 12, when the first rack 10 moves to be meshed with the second rack 11 to be aligned, under the action of the elasticity of the first spring 12, the second rack 11 is re-meshed with the first rack 10, when the rubber pad 2 moves to be completely attached to the top end of the supporting seat 1, screwing the fastening bolt 13, so that the fastening bolt 13 moves along the threaded hole to be attached to the second rack 11, further preventing the second rack 11 from moving, further clamping the T-shaped block 8 in the T-shaped groove 9, and completing the installation of the rubber pad 2;

the connecting mechanism comprises a cylinder 14, a cylindrical block 15, sliding blocks 16, L-shaped grooves 17, clamping grooves 18 and a second spring 19, the cylinder 14 is fixedly installed at the middle position of the top end of the balancing weight 4, the cylindrical block 15 is fixedly installed at the bottom end of the pull rope 5, the cylindrical block 15 is installed inside the cylinder 14, the two sliding blocks 16 are symmetrically and fixedly installed on the annular side surface of the cylindrical block 15, the two L-shaped grooves 17 are symmetrically formed inside the cylinder 14, the sliding blocks 16 are installed inside the L-shaped grooves 17, the clamping grooves 18 are formed in the top end of the inside of the L-shaped grooves 17, the second spring 19 is fixedly installed at the bottom end of the inside of the cylinder 14, the top ends of the second spring 19 are attached to the bottom end of the cylindrical block 15, the cylindrical block 15 is installed inside the cylinder 14, the sliding blocks 16 are installed inside the vertical grooves of the L-shaped grooves 17 to push the cylindrical block 15 downwards, the cylindrical block 15 moves to drive the sliding blocks 16 to move along the vertical grooves, the cylindrical block 15 moves to extrude the second spring 19, then the cylindrical block 15 rotates, the cylindrical block 15 rotates to drive the sliding block 16 to move along the transverse groove, and when the sliding block 16 moves to the end of the transverse groove and is aligned with the clamping groove 18, under the action of the elastic force of the second spring 19, the cylindrical block 15 moves to drive the sliding block 16 to move into the clamping groove 18, so that the cylindrical block 15 is clamped inside the cylinder 14, and the connection between the pull rope 5 and the counterweight block 4 is completed;

the clamping mechanism comprises a round block 20, a semi-ring pressing block 21, a moving block 22, a guide rod 23, a spring III 24 and a limiting bolt 25, wherein the round block 20 is fixedly installed at one end of the pull rod 5 close to the pull rod 6, the round block 20 is installed on the pull rod 6, two rectangular grooves are symmetrically formed in the annular side surface of the pull rod 6 and are symmetrically formed in the left side and the right side of the round block 20, the guide rod 23 is fixedly installed in each rectangular groove, the moving block 22 and the spring III 24 are installed on the annular side surface of the guide rod 23, two ends of the spring III 24 are respectively and fixedly installed on the moving block 22 and the inner wall of each rectangular groove, a pressing block semi-ring 21 is fixedly installed at the top end of the moving block 22, the bottom end of the semi-ring pressing block 21 is attached to the top end of the pull rod 6 and the top end of the round block 20, the limiting bolt 25 is installed at the top end of the semi-ring pressing block 21, and the bottom end of the limiting bolt 25 penetrates through the pressing block semi-ring 21 and is fixedly installed on the round block 20, the semi-ring pressing block 21 is pulled outwards, the semi-ring pressing block 21 moves to drive the moving block 22 to move along the guide rod 23, the moving block 22 moves to stretch the spring III 24, the moving block 22 moves to be attached to the magnetic ring 26 in an adsorption mode, the adsorption force between the magnetic ring 26 and the moving block 22 is larger than the elastic force of the spring III 24, further fixing the position of the moving block 22 and the half ring pressing block 21, installing the round block 20 inside the clamping rod, pulling the half ring pressing block 21 reversely, moving the half ring pressing block 21 to drive the moving block 22 to move away from the magnetic ring 26, under the action of the elastic force of the spring III 24, the moving block 22 moves to drive the half-ring pressing block 21 to move to be attached to the top end of the round block 20, then, the limit bolt 25 is installed inside the circular hole and the limit bolt 25 is rotated, the limit bolt 25 is rotated to enter the nut 27, and then the connection of the semi-ring pressing block 21 and the round block 20 is completed, and the connection of the pull rope 5 and the pull rod 6 is completed.

The two T-shaped blocks 8 are symmetrically and fixedly arranged at the bottom end of the rubber pad 2, and the two T-shaped blocks 8 are aligned front and back at the bottom end of the rubber pad 2; two fastening bolts 13 are symmetrically installed at the right end of the supporting seat 1, and one ends of the fastening bolts 13 extend into the grooves and are aligned with the racks II 11 left and right; the L-shaped groove 17 consists of a vertical groove and a transverse groove, two vertical grooves and two transverse grooves are symmetrically formed in the cylinder 14, the bottom ends of the vertical grooves are communicated with the transverse grooves, a clamping groove 18 is formed in the top end of the inner part of the transverse groove, and the size of the cross section of the clamping groove 18 is the same as that of the cross section of the sliding block 16; the other end inside the rectangular groove is fixedly provided with a magnetic ring 26, and the magnetic ring 26 is fixedly arranged on the outer side of the annular side face of the guide rod 23; the top end of the semi-ring pressing block 21 is provided with a round hole, a limiting bolt 25 is arranged in the round hole, a nut 27 is arranged on the annular side surface of the limiting bolt 25, and the outer side of the nut 27 is fixedly arranged in the round block 20; a circular through hole is formed in one end of the moving block 22, a guide rod 23 is arranged in the circular through hole, more than two balls are uniformly arranged in the circular through hole, and the spherical side surfaces of the balls are attached to the annular side surface of the guide rod 23; the supporting rod 7 is fixedly arranged on the supporting seat 1 through a first bolt, and the U-shaped frame 3 is fixedly arranged on the supporting seat 1 through a second bolt; the left end and the right end of the balancing weight 4 are symmetrically and fixedly provided with square blocks, the left wall and the right wall inside the U-shaped frame 3 are symmetrically provided with strip-shaped grooves, and the square blocks are slidably arranged inside the strip-shaped grooves; two threaded holes are symmetrically formed in the right end of the supporting seat 1, one end of each threaded hole is communicated with the corresponding groove, and a fastening bolt 13 is installed inside each threaded hole.

This application is when using, install T type piece 8 inside T type groove 9, T type piece 8 removes and drives rack one 10 and remove, rack one 10 removes and extrudes rack two 11, make rack two 11 remove and extrude spring one 12, when rack one 10 removes and aligns with rack two 11 meshing, under the effect of spring one 12 elasticity, rack two 11 removes and rack one 10 re-meshes, when rubber pad 2 removes and pastes with 1 top of supporting seat completely, twist fastening bolt 13, make fastening bolt 13 remove and rack two 11 laminating along the screw hole, and then avoid rack two 11 to take place to remove, and then with T type piece 8 joint inside T type groove 9, accomplish the installation of rubber pad 2.

Install cylinder piece 15 inside drum 14, make slider 16 install the perpendicular inslot portion in L type groove 17, promote cylinder piece 15 downwards, cylinder piece 15 removes and drives slider 16 and remove along perpendicular groove, cylinder piece 15 removes and extrudes two 19 springs, rotate cylinder piece 15 afterwards, cylinder piece 15 rotates and drives slider 16 and remove along the cross slot, when slider 16 removes to the cross slot end and card slot 18 aligns, under the effect of two 19 spring forces of spring, cylinder piece 15 removes and drives slider 16 and remove inside getting into card slot 18, and then inside drum 14 with 15 joints of cylinder piece, accomplish being connected of stay cord 5 and balancing weight 4.

Install the dome 20 inside the kelly, reverse pulling semi-ring briquetting 21, semi-ring briquetting 21 removes and drives movable block 22 and remove and the separation of magnetic ring 26, and under the effect of three 24 spring forces, movable block 22 removes and drives semi-ring briquetting 21 and remove and the laminating of dome 20 top, installs limit bolt 25 inside the round hole and rotates limit bolt 25 after that, and inside limit bolt 25 rotated the entering nut 27, and then accomplished the connection of semi-ring briquetting 21 and dome 20, accomplished being connected of stay cord 5 and pull rod 6.

The application has the advantages that:

1. install T type piece inside T type groove, T type piece removes and drives rack one and remove, rack one removes and extrudees rack two, make rack two remove and extrude spring one, when rack one removes and the meshing of rack two aligns, under the effect of spring elasticity, rack two remove and the meshing of rack one again, when the rubber pad removes and pastes with the supporting seat top completely, twist fastening bolt, make fastening bolt remove and the laminating of rack two along the screw hole, and then avoid rack two to take place to remove, and then with T type piece joint inside T type groove, accomplish the installation of rubber pad, the convenient installation mechanism of rubber pad has been solved and has lacked, cause inconvenient the problem of changing the maintenance to the rubber pad.

2. Install the cylinder piece inside the drum, make the slider install in the perpendicular inslot portion in L type groove, promote the cylinder piece downwards, the cylinder piece removes and drives the slider and remove along perpendicular groove, the cylinder piece removes and extrudees spring two, rotate the cylinder piece after that, the cylinder piece rotates and drives the slider and remove along the cross slot, when the slider removes to the cross slot end and aligns with the draw-in groove, under the effect of two elastic forces of spring, the cylinder piece removes and drives the slider and remove inside getting into the draw-in groove, and then inside the cylinder joint at the drum, accomplish being connected of stay cord and balancing weight, the lack of coupling mechanism has been solved, cause inconvenient drawback with stay cord bottom fixed mounting on the balancing weight.

3. Install the disk inside the kelly, reverse pulling semi-ring briquetting, the semi-ring briquetting removes and drives the removal piece and remove and separate with the magnetic ring, under the effect of three elasticity of spring, the movable block removes and drives semi-ring briquetting and remove and laminate with the disk top, install spacing bolt inside the round hole and rotate spacing bolt after that, spacing bolt rotates inside getting into the nut, and then accomplish being connected of semi-ring briquetting and disk, accomplish being connected of stay cord and pull rod, the clamping mechanism that lacks has been solved, cause inconvenient with the stay cord other end and pull rod fixed connection, and then inconvenient problem of carrying out the dismouting maintenance to the pull rod.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The utility model provides a high tension dorsal muscle training ware is used in sports teaching which characterized in that: the support comprises a support seat (1), a rubber pad (2), a U-shaped frame (3), a balancing weight (4), a pull rope (5), a pull rod (6), a support rod (7), an installation mechanism, a connection mechanism and a clamping mechanism, wherein the rubber pad (2) is assembled at the top end of the support seat (1), the U-shaped frame (3) is fixedly installed at the rear side of the top end of the support seat (1), the balancing weight (4) is slidably installed inside the U-shaped frame (3), the support rod (7) is fixedly installed at the top end of the support seat (1), the support rod (7) is located between the rubber pad (2) and the U-shaped frame (3), the pull rope (5) is fixedly installed at the top end of the balancing weight (4), and the other end of the pull rope (5) penetrates through the U-shaped frame (3) and the support rod (7) and is fixedly installed on the pull rod (6);

the mounting mechanism comprises a T-shaped block (8), a T-shaped groove (9), a first rack (10), a second rack (11) and a first spring (12), the T-shaped block (8) is fixedly mounted at the bottom end of a rubber pad (2) of the T-shaped block (8), the T-shaped groove (9) is formed in the middle position of the top end of the supporting seat (1), the T-shaped block (8) is mounted inside the T-shaped groove (9), the first rack (10) is fixedly mounted at the right end of the T-shaped block (8), two grooves are symmetrically formed in the T-shaped groove (9), the second rack (11) is fixedly mounted inside the grooves, and the left end of the second rack (11) is meshed with the right end of the first rack (10);

the connecting mechanism comprises a cylinder (14), a cylinder block (15), sliding blocks (16), L-shaped grooves (17), clamping grooves (18) and a second spring (19), the cylinder (14) is fixedly installed at the middle position of the top end of the balancing weight (4), the cylinder block (15) is fixedly installed at the bottom end of the pull rope (5), the cylinder block (15) is installed inside the cylinder (14), the two sliding blocks (16) are symmetrically and fixedly installed on the annular side surface of the cylinder block (15), the two L-shaped grooves (17) are symmetrically formed in the cylinder (14), the sliding blocks (16) are installed in the L-shaped grooves (17), the clamping grooves (18) are formed in the top end of the L-shaped grooves (17), the second spring (19) is fixedly installed at the bottom end of the cylinder (14), and the top end of the second spring (19) is attached to the bottom end of the cylinder block (15);

the clamping mechanism comprises a round block (20), a half ring pressing block (21), a moving block (22), a guide rod (23), a spring III (24) and a limiting bolt (25), the stay cord (5) is fixedly provided with the round block (20) close to one end of the pull rod (6), the round block (20) is arranged on the pull rod (6), two rectangular grooves are symmetrically formed in the annular side surface of the pull rod (6), the two rectangular grooves are symmetrically formed in the left side and the right side of the round block (20), the guide rod (23) is fixedly arranged in the rectangular grooves, the moving block (22) and the spring III (24) are arranged on the annular side surface of the guide rod (23), the two ends of the spring III (24) are respectively and fixedly arranged on the moving block (22) and the inner wall of the rectangular grooves, the pressing block (21) is fixedly arranged at the top end of the moving block (22), and the bottom end of the pressing block half ring (21) is jointed with the top end of the pull rod (6) and the top end of the round block (20), and a limiting bolt (25) is installed at the top end of the semi-ring pressing block (21), and the bottom end of the limiting bolt (25) penetrates through the semi-ring pressing block (21) to be fixedly installed on the round block (20).

2. The high-tension dorsal muscle trainer for physical education as claimed in claim 1, wherein: two T-shaped blocks (8) are symmetrically and fixedly installed at the bottom end of the rubber pad (2), and the two T-shaped blocks (8) are aligned front and back at the bottom end of the rubber pad (2).

3. The high-tension dorsal muscle trainer for physical education as claimed in claim 1, wherein: two fastening bolts (13) are symmetrically installed at the right end of the supporting seat (1), and one end of each fastening bolt (13) extends to the inside of the corresponding groove and is aligned with the left side and the right side of the second rack (11).

4. The high-tension dorsal muscle trainer for physical education as claimed in claim 1, wherein: the L-shaped groove (17) is composed of a vertical groove and a transverse groove, the two vertical grooves and the two transverse grooves are symmetrically formed in the cylinder (14), the bottom end of each vertical groove is communicated with the corresponding transverse groove, the top end of the inner portion of each transverse groove is provided with a clamping groove (18), and the cross section of each clamping groove (18) is the same as that of the corresponding sliding block (16).

5. The high-tension dorsal muscle trainer for physical education as claimed in claim 1, wherein: the other end of the inside of the rectangular groove is fixedly provided with a magnetic ring (26), and the magnetic ring (26) is fixedly arranged on the outer side of the annular side face of the guide rod (23).

6. The high-tension dorsal muscle trainer for physical education as claimed in claim 1, wherein: the round hole has been seted up on semi-ring briquetting (21) top, and round hole internally mounted has spacing bolt (25), install nut (27) on spacing bolt (25) annular side, and nut (27) outside fixed mounting is inside circle piece (20).

7. The high-tension dorsal muscle trainer for physical education as claimed in claim 1, wherein: circular through-hole has been seted up to movable block (22) one end, and circular through-hole internally mounted has guide arm (23), the inside even installation more than two balls of circular through-hole, and the spherical side of ball is laminated mutually with guide arm (23) annular side.

8. The high-tension dorsal muscle trainer for physical education as claimed in claim 1, wherein: the supporting rod (7) is fixedly installed on the supporting seat (1) through a first bolt, and the U-shaped frame (3) is fixedly installed on the supporting seat (1) through a second bolt.

9. The high-tension dorsal muscle trainer for physical education as claimed in claim 1, wherein: both ends symmetry fixed mounting has the square about balancing weight (4), the bar groove has been seted up to the symmetry on two walls about U type frame (3) is inside, square slidable mounting is in the bar inslot portion.

10. The high-tension dorsal muscle trainer for physical education as claimed in claim 1, wherein: two threaded holes are symmetrically formed in the right end of the supporting seat (1), one end of each threaded hole is communicated with the corresponding groove, and a fastening bolt (13) is installed inside each threaded hole.