Load adjusting mechanism, upper limb strength training tension device and fitness stool

Abstract

The utility model belongs to the technical field of fitness training instruments, and particularly relates to a load adjusting mechanism, an upper limb strength training tension device and a fitness stool. The load adjusting mechanism comprises a basic load box, an expansion load box and a hook assembly. The hook assembly comprises a fixing shaft, a hook body rotationally arranged on the fixing shaft and a rebounding unit providing rotation power for the hook body. A buckling part is formed on one side of the hook body, a pressing part is formed on the other side of the hook body, and a pressing unit is arranged above the pressing part; the hook assembly is arranged on the expansion load box, and the buckling part is buckled on the basic load box under the action of the springback unit; and the pressing unit moves downwards to push the pressing part, so that the buckling part overcomes the acting force of the springback unit to move upwards to release the buckling of the basic load box and the expansion load box. By arranging the basic load box, the expansion load box and the hook assembly, quick connection and separation of the two loads are achieved, then resistance adjustment is achieved, and convenience and safety are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of fitness training equipment technology, specifically a load adjustment mechanism, an upper limb strength training tension device, and a fitness bench. Background Technology

[0002] With societal development, people's demand for fitness is increasing, and fitness equipment is constantly evolving and innovating. For fitness benches, their function is no longer limited to meeting users' basic fitness needs, but is moving towards greater user-friendliness, multi-functionality, comfort, and efficient storage.

[0003] In limited indoor living spaces, convenient storage has become a key consideration. To reduce the space occupied by exercise benches, many foldable or stand-up models have appeared on the market, providing consumers with more options for placing exercise benches, which have been well received by consumers.

[0004] Existing fitness benches are usually multifunctional, one of which is upper body strength training, using an upper body strength training pull device. This device can be stored inside the fitness bench when not in use, and unfolded to expose the outside for users to perform strength training. The load of existing upper body strength training pull devices is relatively simple. When the load needs to be increased, the elasticity can only be adjusted manually by adjusting the number of elastic ropes, which is very inconvenient. In addition, the elastic structure is completely exposed, which is not only unsightly, but also poses certain safety risks. Utility Model Content

[0005] To address the problems mentioned above, this utility model provides a load adjustment mechanism, an upper limb strength training pull device, and a fitness bench. By setting a basic load box, an expanded load box, and a hook assembly, it enables the rapid connection and separation of two loads, thereby achieving resistance adjustment, which is both convenient and safe.

[0006] The first aspect of this utility model is to provide a load adjustment mechanism, including a basic load box, an extended load box, and a hook assembly connecting the basic load box and the extended load box, wherein:

[0007] The hook assembly includes a fixed shaft, a hook body rotatably mounted on the fixed shaft, and a spring-loaded unit that provides rotational force to the hook body; a snap-fit ​​portion is formed on one side of the hook body on the fixed shaft, a pressing portion is formed on the other side of the fixed shaft, and a pressing unit is provided above the pressing portion;

[0008] The latching part is located at the junction of the base load box and the expansion load box, and the hook assembly is set on the base load box. The latching part is fastened to the expansion load box under the action of the spring-load unit; or the hook assembly is set on the expansion load box, and the latching part is fastened to the base load box under the action of the spring-load unit.

[0009] The pressing unit moves the pushing and pressing part downward, so that the buckle part moves upward to release the buckling of the basic load box and the expansion load box against the force of the rebound unit.

[0010] Further, the rebound unit comprises a torsion spring sleeved on the fixed shaft, the torsion spring acts on the hook body, and when the buckle part on the hook body is buckled on the basic load box or the expansion load box, the torsion spring is in a pre-tightening state.

[0011] Further, the hook body comprises a shaft hole part sleeved on the fixed shaft, the shaft hole part is connected with the buckle part through a slope plate, and the lower end of the slope plate is fixed with a limiting plate.

[0012] Further, the pressing part is an arc-shaped structure with an opening downward, the pressing unit is located above the top of the arc-shaped structure, and the pressing unit comprises a pressing cap and a pressing rod fixed at the lower end of the pressing cap; downward pressure is applied to the pressing cap, the pressing rod drives the hook body to rotate around the fixed shaft, and the buckle part moves upward to release the buckling of the basic load box and the expansion load box.

[0013] Further, the lower end of the pressing cap is provided with at least two arc-shaped grooves, one end of the arc-shaped groove extends to the bottom to form a guide groove, the upper side of the hook assembly is provided with a protective cover plate, the upper end of the protective cover plate is fixed with a guide column corresponding to the arc-shaped groove in a one-to-one manner, and the cross section of the guide column is matched with the cross section of the guide groove.

[0014] The pressing cap is rotated to make the guide column located in the arc-shaped groove, and the pressing rod is separated from the pressing part; the pressing cap is rotated to make the guide column located in the guide groove, and downward pressure is applied to the pressing cap, so that the pressing rod drives the hook body to rotate.

[0015] Further, the two sides of the basic load box and the expansion load box are provided with shaft sleeves, the shaft sleeves on the basic load box and the expansion load box at the same side are coaxially arranged, and the basic load box and the expansion load box are slidably sleeved on the slide rod through the shaft sleeves on the two sides.

[0016] Further, at least three first pulleys for sleeving the pull rope are arranged in the basic load box.

[0017] The second aspect of the utility model provides a kind of upper limb strength training tension device, including load adjusting mechanism of any one of above, still include multiple elastic ropes, and first clasp for hanging elastic rope is equipped on the basic load box and expansion load box.

[0018] Further, it further includes the hanging plate opposite to the basic load box and the roller opposite to the expansion load box, the second clasp corresponding to the first clasp is fixed on the hanging plate;One end of the elastic rope is hung on the first clasp, and the other end is hung on the second clasp after passing through the roller;

[0019] The first pulley is arranged in the basic load box, a plurality of second pulleys are arranged on the hanging plate and are matched with the first pulley, and the two ends of the pull rope are connected with the connecting pull ring after passing through the first pulley and the second pulley.

[0020] The third aspect of the utility model provides a body-building stool, including the upper limb strength training tension device of above.

[0021] Compared with the prior art, the utility model has the advantages of:

[0022] (1) the load adjusting mechanism of the embodiment comprises a basic load box and an expansion load box which are arranged adjacently, and the basic load box and the expansion load box are connected through a hook assembly; in normal state, the elastic unit of the hook assembly is in a pre-tightening state, the elastic unit makes the buckle part of the hook body connect the basic load box and the expansion load box into one, so as to realize the effect of increasing load; when it is needed to reduce the load, downward pressure is applied to the pressing unit, the pressing unit pushes the pressing part, so that the buckle part moves upward against the force of the elastic unit to disconnect the basic load box and the expansion load box, and the basic load box and the expansion load box become two independent modules; the structure is simple, the operation is convenient, and different load requirements can be met.

[0023] (2) the elastic unit of the load adjusting mechanism comprises a torsion spring which is sleeved on a fixed shaft; in the case that the pressing unit is not operated, the torsion spring can drive the buckle part to rotate into the hanging hole on the basic load box, so as to realize the connection of the two, and the torsion spring is always in a pre-tightening state, so as to guarantee the firmness of the connection of the basic load box and the expansion load box, and avoid that the two are separated in the training process; the torsion spring is used to realize the rotation of the hook body, so that the overall structure is simple, convenient to install and low in cost.

[0024] (3) the upper part of the entire elastic part of the upper limb strength training tension device is provided with a protective cover plate, the elastic part is hidden in the protective cover plate, so that the appearance is more neat and beautiful, and the safety is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows; obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0026] Figure 1 The overall structure diagram of the load adjusting mechanism provided by the embodiment of the utility model is shown in the figure.

[0027] Figure 2 The hook assembly structure diagram of the load adjusting mechanism provided by the embodiment of the utility model is shown in the figure.

[0028] Figure 3 The hook body structure diagram of the load adjusting mechanism provided by an embodiment of the present application is shown in the figure;

[0029] Figure 4 The pressing unit structure diagram of the load adjusting mechanism provided by an embodiment of the present application is shown in the figure;

[0030] Figure 5 The overall appearance diagram of the upper limb strength training pulling device provided by an embodiment of the present application is shown in the figure;

[0031] Figure 6 Figure 5 The enlarged view of the middle A part;

[0032] Figure 7 The internal structure diagram (I) of the upper limb strength training pulling device provided by an embodiment of the present application is shown in the figure;

[0033] Figure 8 The internal structure diagram (II) of the upper limb strength training pulling device provided by an embodiment of the present application is shown in the figure;

[0034] Figure 9 The structure diagram of the fitness bench provided by an embodiment of the present application is shown in the figure;

[0035] Wherein: 1 - base load box, 11 - hanging hole, 12 - shaft sleeve, 13 - sliding rod, 14 - first hook, 15 - first pulley, 2 - expansion load box, 21 - support, 211 - bottom plate, 212 - vertical plate, 3 - hook assembly, 31 - fixed shaft, 32 - hook body, 321 - buckle part, 322 - pressing part, 323 - shaft hole part, 324 - inclined plate, 325 - limiting plate, 33 - rebound unit, 34 - pressing unit, 341 - pressing cap, 3411 - arc-shaped groove, 3412 - guide groove, 342 - pressing rod, 4 - protective cover plate, 41 - guide column, 5 - pulling rope, 6 - backrest plate, 61 - roller, 62 - hanging plate, 621 - second hook, 622 - second pulley, 63 - elastic rope. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application. Figure 1 to the drawings in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application. Figure 9 The present application is described in detail below with reference to specific embodiments.

[0038] As Figures 1 to 9 The utility model provides a load adjustment mechanism, install in upper limb strength training tension device, provide different size load training for user. The load adjustment mechanism of the application includes basic load box 1, expansion load box 2 and the hook assembly 3 of connecting basic load box 1 and expansion load box 2, and the first hook 14 for hanging elastic rope 63 is equipped on basic load box 1 and expansion load box 2, and basic load box 1 and expansion load box 2 are two separate load boxes, and the two can be connected as a whole to form larger load by hook assembly 3, and basic load box 1 can be used only to provide smaller load.

[0039] Hook assembly 3 includes fixed shaft 31, hook body 32 that rotates on fixed shaft 31 and rebound unit 33 that provides rotary power for hook body 32, and the buckle part 321 for connecting basic load box 1 or expansion load box 2 is formed on one side of hook body 32 at fixed shaft 31, and the pressing unit 34 is arranged above the pressing part 322 on the other side of hook body 32 at fixed shaft 31, and the pressing unit 34 exerts pressure on the pressing part 322, and the connection of basic load box 1 and expansion load box 2 can be released, that is, by exerting pressure on the pressing part 322, hook body 32 rotates around fixed shaft 31, specifically, the pressing part 322 rotates downward, and the buckle part 321 rotates upward, and then basic load box 1 is formed into a separate load module, and it can be known that the buckle part 321 is used to connect basic load box 1 and expansion load box 2, therefore, the buckle part 321 is located at the abutting place of basic load box 1 and expansion load box 2. In one embodiment, hook assembly 3 is arranged on basic load box 1, in other words, a bracket 21 is arranged on basic load box 1, both ends of fixed shaft 31 are arranged on bracket 21 respectively, and a hanging hole 11 that cooperates with the buckle part 321 is arranged on expansion load box 2, and under normal circumstances, the buckle part 321 is buckled on the hanging hole 11 of expansion load box 2 under the action of rebound unit 33, and then the connection of the two is realized, and in another embodiment, hook assembly 3 is arranged on expansion load box 2, a bracket 21 is arranged on expansion load box 2, both ends of fixed shaft 31 are arranged on bracket 21 respectively, and a hanging hole 11 that cooperates with the buckle part 321 is arranged on basic load box 1, and under normal circumstances, the buckle part 322 is buckled on the hanging hole 11 of basic load box 1 under the action of rebound unit 33.

[0040] When the load needs to be reduced, the user can exert downward pressure on the pressing unit 34, causing the pressing unit 34 to move downward and push the pressing portion 322, which rotates downward around the fixed shaft 31, and the clamping portion 321 rotates upward around the fixed shaft 31, causing the clamping portion 321 to move upward against the force of the rebound unit 33, thereby releasing the clamping of the basic load box 1 and the expansion load box 2. At this time, the basic load box 1 alone can be used as a load, the load is reduced, and the difficulty of training is reduced.

[0041] The present application adjusts the load size by setting two groups of load boxes and operating the simple pressing unit 34, meets different training needs, has a simple overall structure, is convenient to operate, and has a low cost.

[0042] The following embodiments of the present application are described in detail with the hook assembly 3 arranged on the expansion load box 2 as an example.

[0043] Specifically, in some embodiments, the rebound unit 33 includes a torsion spring sleeved on the fixed shaft, the torsion spring acts on the hook body 31, and when the clamping portion 321 on the hook body 31 is clamped on the basic load box 1, the torsion spring is in a pre-tightened state. In other words, without operating the pressing unit 34, the torsion spring can drive the clamping portion 321 to rotate into the hanging hole 11 on the basic load box 1, achieving the connection of the two, and the torsion spring is always in a pre-tightened state, ensuring the firmness of the connection of the basic load box 1 and the expansion load box 2, and avoiding the disconnection of the two during training.

[0044] In the preferred embodiment, referring to Figure 3 , the hook body 32 further includes a shaft hole portion 323 sleeved on the fixed shaft 31, the shaft hole portion 323 is connected with the clamping portion 321 through a slope plate 324, the lower end of the slope plate 324 is fixed with a limiting plate 325, when the torsion spring drives the clamping portion 321 to rotate into the hanging hole 11, the limiting plate 325 also rotates downward, and when the limiting plate 325 contacts the bottom plate of the support 21, the clamping portion 321 is rotated in place and clamped in the hanging hole 11. At this time, the torsion spring still retains a certain pre-tightening force, to achieve the firmness of the connection of the basic load box 1 and the expansion load box 2.

[0045] In some embodiments, the pressing portion 322 is an arc-shaped structure with an opening facing downward, the pressing unit 34 is located above the top of the arc-shaped structure, and the pressing unit 34 includes a pressing cap 341 and a pressing rod 342 fixed at the lower end of the pressing cap 341; downward pressure is applied to the pressing cap 341, the pressing rod 342 moves downward to drive the hook body 32 to rotate around the fixed shaft 31, and at the same time, the buckle portion 321 moves upward to release the buckling relationship between the basic load box 1 and the expansion load box 2. It can be understood that the hook body 32 is a rotating member, and the rotation of the hook body 32 can realize the rotation of the buckle portion 321, thereby establishing the connection between the basic load box 1 and the expansion load box 2 or releasing the connection between the basic load box 1 and the expansion load box 2.

[0046] In preferred embodiments, referring to Figure 4 、 Figure 5 、 Figure 6 , in order to avoid the pressing cap 341 being pressed by mistake, at least two arc-shaped grooves 3411 are circumferentially formed at the lower end of the pressing cap 341, one end of the arc-shaped groove 3411 extends to the bottom to form a guide groove 3412, the upper portion of the hook assembly 3 is provided with a protective cover plate 4, the protective cover plate 4 is used to hide the entire elastic portion of the upper limb strength training tension device therein, so that the appearance is more neat and beautiful, the upper end of the protective cover plate 4 is fixed with a guide column 41 corresponding to the arc-shaped groove 3411, the cross section of the guide column 41 is adapted to the cross section of the guide groove 3412; in the normal state without the need to reduce the load, the upper end of the guide column 41 is located in the arc-shaped groove 3411 by rotating the pressing cap 341, while being away from the guide groove 3412, at this time, the pressing rod 342 is separated from the pressing portion 322, the buckle portion 321 on the hook body 32 is buckled in the hanging hole 11 of the basic load box 1, and at the same time, since the upper end of the guide column 41 abuts against the bottom end of the arc-shaped groove 3411, the user cannot move the pressing cap 341 downward even if downward pressure is applied to the pressing cap 341, thereby avoiding the situation of user misoperation; when the load needs to be reduced, the guide column 41 is aligned with the guide groove 3412 by rotating the pressing cap 341, and downward pressure is applied to the pressing cap 341, the guide groove 3412 moves downward along the guide column 41, while the pressing rod 342 drives the hook body 32 to rotate, so that the buckle portion 321 rotates upward to release the connection relationship between the basic load box 1 and the expansion load box 2.

[0047] In some embodiments, referring to Figure 7 、 Figure 8The base load box 1 and the expansion load box 2 are load boxes with lengths, and the two are placed next to each other, and the base load box 1 and the expansion load box 2 are provided with shaft sleeves 12 on both sides in the length direction, the shaft sleeves 12 on the base load box 1 and the expansion load box 2 on the same side are coaxially arranged, and the base load box 1 and the expansion load box 2 are slidably sleeved on the slide rods 13 through the shaft sleeves 12 on both sides, in other words, during training, the base load box 1 and the expansion load box 2 can be pulled by the pull rope 5 to slide on the two slide rods 13 at the same time, if only the base load box 1 is needed, only the base load box 1 is pulled to slide on the slide rod 13, and the two slide rods 13 of the application provide guidance for the sliding of the base load box 1 and the expansion load box 2, so that the base load box 1 and the expansion load box 2 move in a straight line.

[0048] Specifically, referring to Figure 1 The base load box 1 is provided with at least three first pulleys 15 for sleeving the pull rope 5, the pull rope 5 is sleeved on the first pulley 15, and the user can drive the base load box 1 and the expansion load box 2 to pull the elastic rope 63 to move forward when pulling the pull rope 5, so as to provide different elastic forces for the user.

[0049] The hook assembly 3 of the application is fixed with the expansion load box 2 as a whole, specifically, the expansion load box 3 includes a support 21 in the middle, the support 21 includes a bottom plate 211 and vertical plates 212 fixed on both sides of the bottom plate 211, both ends of the fixed shaft 31 are connected to the two vertical plates 212, respectively, the first clasp 14 is integrally formed on the support 21 and located at one end of the support 21 away from the base load box 1.

[0050] Referring to Figures 5 to 8 The utility model also provides a kind of upper limb strength training tension device, including above-mentioned load adjusting mechanism, still include multiple elastic ropes 63, and the first clasp 14 for hanging elastic rope 63 is provided on the base load box 1 and the expansion load box 2.

[0051] Specifically, the backrest plate 6 is arranged on the upper side of the backrest plate 6, and the base load box 1, the expansion load box 2 and the elastic rope 63 are arranged on the upper side of the backrest plate 6. The two ends of the length direction of the upper side of the backrest plate 6 are respectively provided with the roller shaft 61 and the hanging plate 62, wherein the hanging plate 61 is opposite to the base load box 1, the roller shaft 61 is opposite to the expansion load box 2, and the second hook 621 corresponding to the first hook 14 is fixed on the hanging plate 61. The number of the elastic rope 63 is the same as that of the first hook 14, one end of the elastic rope 63 is hung on the first hook 14, the other end of the elastic rope 63 is hung on the second hook 621 after passing through the roller shaft 61, the elastic rope 63 provides resistance, the more the elastic rope 63 is hung, the greater the resistance is, and the greater the required strength for training is. The base load box 1 is provided with three first pulleys 15 arranged at intervals, the hanging plate 62 is provided with a plurality of second pulleys 622 matched with the first pulleys 15, and the two ends of the pull rope 5 pass through the first pulleys 15 and the second pulleys 622 and are connected with the connecting pull ring. It can be seen that the more the number of the first pulleys 15 in the base load box 1 is, the more uniform the pulling force is, and the training effect can be improved.

[0052] The upper part of the entire elastic part of the upper limb strength training pull device of the application is provided with a protective cover plate 4, which hides the elastic part therein, so that the appearance is more neat and beautiful, and the safety is improved.

[0053] Referring to Figure 9 The application also provides a fitness stool comprising the upper limb strength training pull device.

[0054] The fitness stool and the upper limb strength training pull device provided by the application all adopt all the technical solutions of the above load adjusting mechanism, and therefore at least have all the beneficial effects brought by the technical solutions of the load adjusting mechanism, which will not be described herein.

[0055] The above describes the application by means of specific embodiments, but it should be understood that the specific description herein should not be understood as limiting the essence and scope of the application, and various modifications made by those skilled in the art after reading the description all belong to the scope protected by the application.

Claims

1. A load adjustment mechanism characterized by, The load adjusting mechanism comprises a basic load box, an extended load box and a hook assembly connecting the basic load box and the extended load box, wherein: The hook assembly comprises a fixed shaft, a hook body rotatably arranged on the fixed shaft and a spring unit providing rotary power for the hook body; a buckle part is formed on one side of the hook body relative to the fixed shaft, and a pressing part is formed on the other side of the hook body relative to the fixed shaft, and a pressing unit is arranged above the pressing part; The buckle part is located at the abutting position of the basic load box and the extended load box, the hook assembly is arranged on the basic load box, and the buckle part is buckled on the extended load box under the action of the spring unit; or the hook assembly is arranged on the extended load box, and the buckle part is buckled on the basic load box under the action of the spring unit; The pressing unit moves downward to push the pressing part, so that the buckle part moves upward to release the buckling of the basic load box and the extended load box against the force of the spring unit.

2. The load adjustment mechanism of claim 1, wherein, The spring unit comprises a torsion spring sleeved on the fixed shaft, the torsion spring acts on the hook body, and when the buckle part of the hook body is buckled on the basic load box or the extended load box, the torsion spring is in a pre-tightened state.

3. The load adjustment mechanism of claim 1, wherein, The hook body comprises a shaft hole part sleeved on the fixed shaft, the shaft hole part is connected with the buckle part through a slope plate, and the lower end of the slope plate is fixed with a limiting plate.

4. The load adjustment mechanism of claim 1, wherein, The pressing part is an arc structure with an opening downward, the pressing unit is located above the top of the arc structure, the pressing unit comprises a pressing cap and a pressing rod fixed at the lower end of the pressing cap; the pressing cap is pressed downward, the pressing rod drives the hook body to rotate around the fixed shaft, and the buckle part moves upward to release the buckling of the basic load box and the extended load box.

5. The load adjustment mechanism of claim 4, wherein, The lower end of the pressing cap is provided with at least two arc-shaped grooves in the circumferential direction, one end of the arc-shaped groove extends to the bottom to form a guide groove, the upper end of a protection cover plate arranged above the hook assembly is fixed with a guide column corresponding to the arc-shaped groove, and the cross section of the guide column is matched with the cross section of the guide groove; The pressing cap is rotated to make the guide column located in the arc-shaped groove, and the pressing rod is separated from the pressing part; the pressing cap is rotated to make the guide column located in the guide groove, and the pressing cap is pressed downward, and the pressing rod drives the hook body to rotate.

6. The load adjustment mechanism of claim 1, wherein, The basic load box and the extended load box are both provided with shaft sleeves on two sides, the shaft sleeves on the same side of the basic load box and the extended load box are coaxially arranged, and the basic load box and the extended load box are both slidably sleeved on a slide rod through the shaft sleeves on two sides.

7. The load adjustment mechanism of claim 1, wherein, At least three first pulleys for sleeving a pull rope are arranged in the basic load box.

8. An upper body strength training pull device, comprising: The load adjusting mechanism comprises a basic load box, an extended load box and a hook assembly connecting the basic load box and the extended load box, wherein: The hook assembly comprises a fixed shaft, a hook body rotatably arranged on the fixed shaft and a spring unit providing rotary power for the hook body; a buckle part is formed on one side of the hook body relative to the fixed shaft, and a pressing part is formed on the other side of the hook body relative to the fixed shaft, and a pressing unit is arranged above the pressing part; The buckle part is located at the abutting position of the basic load box and the extended load box, the hook assembly is arranged on the basic load box, and the buckle part is buckled on the extended load box under the action of the spring unit; or the hook assembly is arranged on the extended load box, and the buckle part is buckled on the basic load box under the action of the spring unit; The pressing unit moves downward to push the pressing part, so that the buckle part moves upward to release the buckling of the basic load box and the extended load box against the force of the spring unit. The spring unit comprises a torsion spring sleeved on the fixed shaft, the torsion spring acts on the hook body, and when the buckle part of the hook body is buckled on the basic load box or the extended load box, the torsion spring is in a pre-tightened state. The hook body comprises a shaft hole part sleeved on the fixed shaft, the shaft hole part is connected with the buckle part through a slope plate, and the lower end of the slope plate is fixed with a limiting plate. The pressing part is an arc structure with an opening downward, the pressing unit is located above the top of the arc structure, the pressing unit comprises a pressing cap and a pressing rod fixed at the lower end of the pressing cap; the pressing cap is pressed downward, the pressing rod drives the hook body to rotate around the fixed shaft, and the buckle part moves upward to release the buckling of the basic load box and the extended load box. The lower end of the pressing cap is provided with at least two arc-shaped grooves in the circumferential direction, one end of the arc-shaped groove extends to the bottom to form a guide groove, the upper end of a protection cover plate arranged above the hook assembly is fixed with a guide column corresponding to the arc-shaped groove, and the cross section of the guide column is matched with the cross section of the guide groove; The pressing cap is rotated to make the guide column located in the arc-shaped groove, and the pressing rod is separated from the pressing part; the pressing cap is rotated to make the guide column located in the guide groove, and the pressing cap is pressed downward, and the pressing rod drives the hook body to rotate. The basic load box and the extended load box are both provided with shaft sleeves on two sides, the shaft sleeves on the same side of the basic load box and the extended load box are coaxially arranged, and the basic load box and the extended load box are both slidably sleeved on a slide rod through the shaft sleeves on two sides. At least three first pulleys for sleeving a pull rope are arranged in the basic load box. The load adjusting mechanism comprises a basic load box, an extended load box and a hook assembly connecting the basic load box and the extended load box, wherein: The hook assembly comprises a fixed shaft, a hook body rotatably arranged on the fixed shaft and a spring unit providing rotary power for the hook body; a buckle part is formed on one side of the hook body relative to the fixed shaft, and a pressing part is formed on the other side of the hook body relative to the fixed shaft, and a pressing unit is arranged above the pressing part; The buckle part is located at the abutting position of the basic load box and the extended load box, the hook assembly is arranged on the basic load box, and the buckle part is buckled on the extended load box under the action of the spring unit; or the hook assembly is arranged on the extended load box, and the buckle part is buckled on the basic load box under the action of the spring unit; The pressing unit moves downward to push the pressing part, so that the buckle part moves upward to release the buckling of the basic load box and the extended load box against the force of the spring unit. The spring unit comprises a torsion spring sleeved on the fixed shaft, the torsion spring acts on the hook body, and when the buckle part of the hook body is buckled on the basic load box or the extended load box, the torsion spring is in a pre-tightened state. The hook body comprises a shaft hole part sleeved on the fixed shaft, the shaft hole part is connected with the buckle part through a slope plate, and the lower end of the slope plate is fixed with a limiting plate. The pressing part is an arc structure with an opening downward, the pressing unit is located above the top of the arc structure, the pressing unit comprises a pressing cap and a pressing rod fixed at the lower end of the pressing cap; the pressing cap is pressed downward, the pressing rod drives the hook body to rotate around the fixed shaft, and the buckle part moves upward to release the buckling of the basic load box and the extended load box. The lower end of the pressing cap is provided with at least two arc-shaped grooves in the circumferential direction, one end of the arc-shaped groove extends to the bottom to form a guide groove, the upper end of a protection cover plate arranged above the hook assembly is fixed with a guide column corresponding to the arc-shaped groove, and the cross section of the guide column is matched with the cross section of the guide groove; The pressing cap is rotated to make the guide column located in the arc-shaped groove, and the pressing rod is separated from the pressing part; the pressing cap is rotated to make the guide column located in the guide groove, and the pressing cap is pressed downward, and the pressing rod drives the hook body to rotate. The basic load box and the extended load box are both provided with shaft sleeves on two sides, the shaft sleeves on the same side of the basic load box and the extended load box are coaxially arranged, and the basic load box and the extended load box are both slidably sleeved on a slide rod through the shaft sleeves on two sides. At least three first pulleys for sleeving a pull rope are arranged in the basic load box. The load adjusting mechanism comprises a basic load box, an extended load box and a hook assembly connecting the basic load box and the extended load box, wherein: The hook assembly comprises a fixed shaft, a hook 9. The upper body strength training pull resistance device of claim 8, wherein, Further comprising a hanging plate opposite to the base load box and a roller opposite to the expansion load box, the hanging plate is fixed with a second hook corresponding to the first hook; one end of the elastic rope is hung on the first hook, and the other end is hung on the second hook after passing through the roller. Three first pulleys are arranged in the base load box, and a plurality of second pulleys are arranged on the hanging plate and matched with the first pulleys; the two ends of the pull rope pass through the first pulleys and the second pulleys and are connected with the connecting pull ring.

10. An exercise bench characterized by The upper limb strength training pull device of claim 8 or 9.

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