Assistance-adjustable pull-up device and progressive pull-up training system

Abstract

The invention discloses a power-assisted adjustable pull-up device and a progressive pull-up training system.The power-assisted adjustable pull-up device comprises a door-shaped support and a power-assisted rod, wherein the door-shaped support is composed of two vertical arm structures and a transverse rod between the two vertical arm structures, and the power-assisted rod is arranged between the lower ends of the two vertical arm structures; the two ends of the power-assisted rod are movably connected with the vertical arm structure up and down; the sliding block is connected with the vertical arm structure in an up-down sliding mode, the lever is hinged to the sliding block, and a cross arm is arranged at the outer end of the lever and used for hanging a counter weight or a counter weight operator. The pull force generated by the counter weight or the counter weight sporter downwards enables the power assisting rod to move upwards through the quadruple pulley block, and power assisting for pull-up is formed. According to the pull-up exerciser, upward assistance is generated for the pull-up exerciser, the pull-up exerciser is helped to complete the complete pull-up action, then the exercise muscle group related to the pull-up exerciser is exercised, and then the weight is gradually reduced until the standard pull-up exercise can be completed without the effect of the weight.

Description

Technical Field

[0001] The invention relates to a pull-up exercise device, more specifically to an adjustable power-assisted pull-up device and a progressive pull-up training system. Background Art

[0002] In the prior art, for pull-up exercise, when the athlete's physical fitness is not enough to complete a standard movement, his confidence is greatly reduced, resulting in the inability to establish a sense of accomplishment in this sport and difficulty in continuing to practice. Therefore, elastic bands are used as auxiliary tools to help athletes complete this movement. However, when the elastic band is used, its lower end cannot be fixed, resulting in the athlete's use of the elastic band to help complete the pull-up movement. The assistance provided by the elastic band will also be weakened as the athlete's body moves upward. The inventor also believes that when it is used in public places or campuses, the elastic band is easily pulled or played with and damaged.

[0003] There is also a pull-up assist device that uses multiple counterweights to help athletes rise. This structure is often found in gyms, but it is relatively complex and expensive. In addition, the pull-up assist device in gyms uses metal blocks as counterweight parts. When it is used in public places or campuses, it is easy for accidents to occur when the metal blocks are raised and lowered due to poor supervision.

[0004] Therefore, the inventor thinks it is necessary to develop and design a new power-assisted adjustable pull-up device and a progressive pull-up training system. Summary of the invention

[0005] The purpose of the present invention is to provide an adjustable power-assisted pull-up device and a progressive pull-up training system in view of the above-mentioned problems existing in the prior art. The system utilizes the weight of other athletes or items such as school bags to act as counterweights, which is low-cost and interesting, and can effectively encourage pull-up doers to perform pull-up exercises.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] The invention discloses an adjustable power-assisted pull-up device, comprising a door-shaped bracket, wherein the door-shaped bracket comprises two vertical arm structures and a crossbar disposed between the upper ends of the two vertical arm structures;

[0008] It also includes a booster rod disposed between the lower ends of the two vertical arm structures.

[0009] The two ends of the power rod are movably connected to the vertical arm structure; a support block is provided in the middle of the power rod to provide auxiliary support force for the pull-up exerciser;

[0010] At least one of the vertical arm structures is provided with a quadruple pulley group, which includes two movable pulleys, a main rope, two fixed pulleys, an intermediate rope and a secondary rope; the movable pulley includes a lower movable pulley and an upper movable pulley; the fixed pulley includes a lower fixed pulley and an upper fixed pulley; the fixed end of the main rope is fixed to the lower end of the vertical arm structure, and the movable end of the main rope is fixedly connected to the end of the power-assisting rod after passing through the lower movable pulley; the core shaft of the lower movable pulley is fixedly connected to the lower end of the intermediate rope, and the upper end of the intermediate rope passes through the upper fixed pulley provided at the upper end of the vertical arm structure, extends downward, passes through the upper movable pulley, extends upward, and is fixedly connected to the upper end of the vertical arm structure;

[0011] and a slider connected to the vertical arm structure for sliding up and down movement, wherein the lower end of the slider is connected to one end of the secondary rope, and the other end of the secondary rope passes over the lower fixed pulley and is fixedly connected to the core shaft of the upper movable pulley;

[0012] a lever hinged to the slider, the inner end of the lever being hinged to the slider, and the outer end of the lever being provided with a cross arm for hanging a counterweight or a counterweight operator;

[0013] A support arm hinged to the middle section of the lever, wherein the upper end of the support arm is hinged to the middle section of the lever, and the lower end of the support arm is hinged to the outer side of the vertical arm structure;

[0014] The downward pulling force generated by the counterweight or the counterweight athlete generates a reverse force through the lever, causing the slider to move upward; the slider then pulls the secondary rope to move the upper movable pulley downward, and the downward movement of the upper movable pulley causes the lower end of the intermediate rope to move upward at twice the speed of the slider; the lower end of the intermediate rope generates an upward lifting force on the lower movable pulley, causing the movable end of the main rope to drive the power-assisting rod to move upward at four times the speed of the slider.

[0015] Preferably, the hinge point between the support arm and the lever is located at the middle section between the cross arm and the inner end of the lever; a spring dynamometer with a display interface facing outward is provided between the slider and the secondary rope, which displays the actual counterweight force digitally or in pointer form.

[0016] Preferably, a telescopic structure is provided at the outer end of the lever to adjust the distance between the cross arm and the hinge point.

[0017] Preferably, the telescopic structure is a spiral structure, the cross arm is fixedly connected to the screw rod, and a nut seat is provided at the outer end of the lever; or, the telescopic structure is a sliding structure, and is provided with a locking cam and a handle connected thereto.

[0018] Preferably, a foot support position is provided on the outer side of the vertical arm structure and is located on the lower side of the horizontal arm to provide a foot support position for the weight-bearing athlete.

[0019] Preferably, there are two sliders, two levers, the cross arm is arranged between the outer ends of the two levers, and the weight mover and the pull-up mover are in opposite directions or in the same direction;

[0020] Alternatively, there is one slider, and the two middle ropes generate power through the same upper movable pulley; the middle rope away from the slider passes through the middle or top of the cross bar.

[0021] The invention discloses an adjustable power-assisted pull-up device, comprising a door-shaped bracket, wherein the door-shaped bracket comprises two vertical arm structures and a crossbar disposed between the upper ends of the two vertical arm structures;

[0022] It also includes a booster rod disposed between the lower ends of the two vertical arm structures.

[0023] The two ends of the power rod are movably connected to the vertical arm structure; a support block is provided in the middle of the power rod to provide auxiliary support force for the pull-up exerciser;

[0024] The vertical arm structure is provided with a double-mode pulley group, which includes three movable pulleys, a force-reducing main rope, a force-increasing main rope, four fixed pulleys, a force-reducing intermediate rope, a force-increasing intermediate rope and a secondary rope; the movable pulley includes a force-reducing lower movable pulley, a force-increasing lower movable pulley and an upper movable pulley; the fixed pulley includes a lower fixed pulley, an upper fixed pulley, a force-reducing fixed pulley and a force-increasing fixed pulley; the vertical arm structure includes a main vertical arm structure and a secondary vertical arm structure;

[0025] The fixed end of the force-reducing main rope is fixed to the lower end of the main vertical arm structure, and the movable end of the force-reducing main rope is passed upward around the force-reducing lower movable pulley and then fixedly connected to the end of the power-assisting rod; the core shaft of the force-reducing lower movable pulley is fixedly connected to the lower end of the force-reducing intermediate rope, and the upper end of the force-reducing intermediate rope passes around the force-reducing fixed pulley and the upper fixed pulley arranged at the upper end of the main vertical arm structure, extends downward, passes around the upper movable pulley, extends upward, and is fixedly connected to the upper end of the main vertical arm structure;

[0026] One end of the booster main rope is fixed to the booster rod, and the other end is fixed to the core shaft of the booster lower movable pulley; one end of the booster intermediate rope is fixed to the upper end of the auxiliary arm structure, and the other end passes around the booster lower movable pulley, the booster fixed pulley and the upper fixed pulley provided at the upper end of the auxiliary arm structure, extends downward, passes around the upper movable pulley, extends upward, and is fixedly connected to the upper end of the main arm structure;

[0027] A mode switching mechanism is provided between the core shaft of the force-reducing lower movable pulley and the lower end of the force-reducing intermediate rope; when the mode switching mechanism is turned on, the core shaft of the force-reducing lower movable pulley and the lower end of the force-reducing intermediate rope are in a movable connection state, and a spring provided between the two is stretched when an external force acts, and retracted when no external force acts; when the mode switching mechanism is turned off, the core shaft of the force-reducing lower movable pulley and the lower end of the force-reducing intermediate rope are in a fixed connection state;

[0028] and a slider connected to the vertical arm structure for sliding up and down movement, wherein the lower end of the slider is connected to one end of the secondary rope, and the other end of the secondary rope passes over the lower fixed pulley and is fixedly connected to the core shaft of the upper movable pulley;

[0029] a lever hinged to the slider, the inner end of the lever being hinged to the slider, and the outer end of the lever being provided with a cross arm for hanging a counterweight or a counterweight operator;

[0030] A support arm hinged to the middle section of the lever, wherein the upper end of the support arm is hinged to the middle section of the lever, and the lower end of the support arm is hinged to the outer side of the vertical arm structure;

[0031] When the mode switching mechanism is closed, the downward pulling force generated by the counterweight or counterweight athlete generates a reverse force through the lever, causing the slider to move upward; the slider then pulls the secondary rope to cause the upper movable pulley to move downward, and the downward movement of the upper movable pulley causes the lower ends of the force-reducing intermediate rope and the force-amplifying intermediate rope to move upward at twice the speed of the slider; the lower end of the force-reducing intermediate rope generates an upward lifting force on the force-reducing lower movable pulley, so that the active end of the force-reducing main rope drives the power-assisting rod to move upward at four times the speed of the slider; the lower end of the force-amplifying intermediate rope generates an upward lifting force on the force-amplifying lower movable pulley, so that the core shaft of the force-amplifying lower movable pulley and the force-amplifying main rope drive the power-assisting rod to move upward at one times the speed of the slider, thereby making the force-amplifying main rope in a non-stressed state, and at this time it is in the force-reducing working mode;

[0032] When the mode switching mechanism is turned on, the downward pulling force generated by the counterweight or the counterweight athlete generates a reverse force through the lever, causing the slider to move upward; the slider then pulls the secondary rope to move the upper movable pulley downward, and the downward movement of the upper movable pulley causes the lower ends of the force-reducing intermediate rope and the force-amplifying intermediate rope to move upward at twice the speed of the slider; the lower end of the force-reducing intermediate rope pulls the spring to generate an upward lifting force on the force-reducing lower movable pulley equal to the spring force; the lower end of the force-amplifying intermediate rope generates an upward lifting force on the force-amplifying lower movable pulley, causing the core shaft of the force-amplifying lower movable pulley and the force-amplifying main rope to drive the power-assisting rod to move upward at one speed of the slider, and it is now in the force-amplifying mode.

[0033] Preferably, the mode switching mechanism comprises a pulley seat for fixing the force-reducing lower movable pulley, a spring lower fixing pin and a rotating shaft arranged in the pulley seat, and a movable block arranged between the spring and the force-reducing intermediate rope; the rotating shaft crosses the movable block; the pulley seat is provided with a hollow groove and slide grooves arranged on both sides of the hollow groove, and the force-reducing lower movable pulley is fixed at the lower end of the hollow groove; the bottom of the slide groove is provided with an arc groove with a diameter greater than the width of the slide groove; the rotating shaft corresponds to the slide groove A flat arc sleeve is fixedly connected in position, the arc section of the flat arc sleeve cooperates with the arc groove, and the flat section cooperates with the slide groove; when the tension of the spring causes the flat arc sleeve to slide into the arc groove, and the knob provided at the outer end of the rotating shaft is turned to make the flat section of the flat arc sleeve perpendicular to the slide groove, the mode switching mechanism is in a closed state; when the knob is turned to make the flat section of the flat arc sleeve parallel to the slide groove, the mode switching mechanism is in an open state.

[0034] The progressive pull-up training system of the present invention adopts the above-mentioned adjustable power-assisted pull-up device, and an upper force sensor and a lower force sensor are respectively provided at the handle position of the cross bar and the supporting position of the power-assisted rod to detect the pulling force at the upper end and the supporting force at the lower end of the pull-up exerciser; it also includes a control circuit connected to the upper force sensor and the lower force sensor, and a power circuit, control buttons and a display screen connected to the control circuit.

[0035] Preferably, it also includes a locking mechanism arranged at the lower end or side position of the slider, and an unlocking mechanism for releasing the locked state. The control circuit is also connected to a locking identification circuit and an identity identification circuit. After the pull-up exerciser is identified through RFID identification or code scanning identification, the exercise time and / or billing is performed.

[0036] Compared with the prior art, the present invention has the following beneficial effects: the present invention can utilize the counterweight effect generated by the counterweight athlete or article (such as a school bag or backpack) through the provided lever and pulley group to generate upward assistance to the pull-up athlete, help the athlete complete the complete pull-up action, and then exercise the related motor muscle groups of the pull-up athlete, and then gradually reduce the counterweight force until the standard pull-up movement can be completed without the counterweight force, and when the counterweight athlete or article (such as a school bag or backpack) is used as the counterweight, it is not easy to cause a hard object collision accident such as that of a metal counterweight block. When a quadruple pulley group is used, it is suitable to use the counterweight athlete as the counterweight, that is, an athlete with a weight similar to that of the pull-up athlete. When the athlete plays the role of counterweight, he is also performing a suspension exercise, achieving the effect of killing two birds with one stone. When a dual-mode pulley set is used, the mode switching mechanism can be used for switching. When it is closed, it is a force reduction mode, and a counterweight athlete (also known as a suspended athlete) can be used to generate a counterweight to provide assistance. When it is opened, it is a force enhancement mode, and a counterweight object (such as a school bag, backpack, etc.) can be used to generate a counterweight to provide assistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a mechanism principle diagram of a specific embodiment 1 of the power-assisted adjustable pull-up device of the present invention (quadruple pulley block embodiment);

[0038] Figure 1A for Figure 1 A partial view of the lever and slide positions in FIG.

[0039] Figure 2 This is a structural diagram of a specific embodiment 2 of the power-assisted adjustable pull-up device of the present invention (also using Figure 1 The four-fold pulley block in the main arm structure is formed by three square tubes fixedly connected).

[0040] Figure 3 for Figure 2 Top view (partial view of the cross arm position);

[0041] Figure 4 for Figure 2 A magnified view of part A in FIG.

[0042] Figure 5 for Figure 2 A magnified view of part B in FIG.

[0043] Figure 5A for Figure 2 A partial enlarged view of the support block position in FIG.

[0044] Figure 6 for Figure 5 Partial view of CC in;

[0045] Figure 7 It is a partial view of the main vertical arm structure at the locking mechanism position of the specific embodiment 3 of the power-assisted adjustable pull-up device of the present invention;

[0046] Figure 8 for Figure 7 A partial view of the position of the locking plate and the unlocking block in FIG.

[0047] Fig. 8A A partial view of the position of the locking plate and the unlocking block of an embodiment with a glove rental function;

[0048] Fig. 9 This is a mechanism schematic diagram of a specific embodiment 4 of the power-assisted adjustable pull-up device of the present invention (dual-mode pulley block embodiment);

[0049] Fig.10 for Fig. 9 A schematic diagram of the structure of the mode switching mechanism in the embodiment (open state);

[0050] Fig.11 for Fig.10 Left view of

[0051] Fig.12 for Fig. 9 A schematic diagram of the structure of the mode switching mechanism in the embodiment (closed state);

[0052] Fig.13 It is a block diagram of a specific embodiment of the progressive pull-up training system of the present invention;

[0053] Fig.14 This is a block diagram of another specific embodiment of the progressive pull-up training system of the present invention (with a glove rental function).

[0054] Reference numerals

[0055] 10 Main arm 101 Inner square tube

[0056] 1010 booster slot 102 middle square tube

[0057] 103 outer square tube 1030 through slot

[0058] 1031 Support rod 1032 Raised edge

[0059] 104 upper fixing plate 105 lower fixing plate

[0060] 106 Locking plate 1064 Lock hook hole

[0061] 1061 Hinge 1062 Electronic Label

[0062] 1063 Magnetic coupling slot 107 Lock hook block

[0063] 1071 Lock pin 108 Unlock block

[0064] 1081 Unlocking solenoid 1082 Lock identification circuit

[0065] 109 Gloves 1091 Raised part

[0066] 20 Auxiliary arm 200 Power assist slot

[0067] 201 Auxiliary upper fixed pulley 202 Auxiliary lower movable pulley

[0068] 203 Auxiliary main rope 204 Auxiliary intermediate rope

[0069] 21 Upper fixing plate 22 Lower fixing plate

[0070] 30 crossbar 40 booster bar

[0071] 41 Support block 42 Positioning column

[0072] 43 Adjustment column 430 Through hole

[0073] 44 Adjustment pin 45 Connection plate

[0074] 46 Bearing seat 47 Bearing

[0075] 48 main rope connection block 70 mode switching mechanism

[0076] 700 Pulley seat 701 Spring

[0077] 702 Spring lower fixing pin 703 Rotating axis

[0078] 7031 flat arc sleeve 704 movable block

[0079] 705 Hollow slot 706 Slide slot

[0080] 7061 Arc groove 711 Force reduction main rope

[0081] 712 Main rope for increasing force 713 Intermediate rope for reducing force

[0082] 714 Intermediate rope 715 Secondary rope

[0083] 721 Force reduction lower pulley 7210 Mandrel

[0084] 722 force-enhancing lower movable pulley 723 upper movable pulley

[0085] 731 Lower fixed pulley 732 Upper fixed pulley

[0086] 733 Force reducing fixed pulley 734 Force increasing fixed pulley

[0087] 811 Main rope 812 Intermediate rope

[0088] 813 rope 821 lower pulley

[0089] 822 upper movable pulley 831 lower fixed pulley

[0090] 832 upper fixed pulley 84 slider

[0091] 841 Slide 85 Lever

[0092] 851 Telescopic tube 852 Locking cam

[0093] 853 Handle 86 Cross arm

[0094] 87 Arm 90 Training System

[0095] 91 Upper force sensor 92 Lower force sensor

[0096] 94 control circuit 941 power circuit

[0097] 942 Control buttons 943 Display screen

[0098] 944 Unlocking Electromagnet 945 Speaker

[0099] 99 Spring dynamometer DETAILED DESCRIPTION

[0100] The technical solution of the present invention will be clearly and completely described below through the following embodiments. Obviously, the embodiments described below are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0101] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0102] It should also be understood that the terms used in this description of the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present invention. As used in the description of the embodiments of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms of "a", "an" and "the" are intended to include plural forms.

[0103] Figures 1 to 8 In the specific embodiment of the power-assisted adjustable pull-up device of the present invention, a quadruple pulley block is used. The power-assisted adjustable pull-up device of the present invention comprises a door-shaped bracket, which comprises two vertical arm structures (specifically comprising a main vertical arm 10 and a secondary vertical arm 20), and a cross bar 30 disposed between the upper ends of the two vertical arm structures; wherein the main vertical arm 10 is formed by three square tubes, namely an inner square tube 101, a middle square tube 102, and an outer square tube 103, which are fixedly connected. The secondary vertical arm 20 is formed by a single square tube.

[0104] It also includes a power rod 40 disposed between the lower ends of the two vertical arm structures, and the two ends of the power rod 40 are respectively connected to the vertical arm structures (i.e., the inner side of the inner square tube 101 and the inner side of the auxiliary vertical arm 20) in an upward and downward manner; a support block 41 is provided in the middle of the power rod to provide auxiliary support force for the pull-up exerciser;

[0105] The main arm 10 is provided with a quadruple pulley group, which includes two movable pulleys arranged in the main arm 10, a main rope 811, two fixed pulleys, an intermediate rope 812 and a secondary rope 813; the movable pulleys include a lower movable pulley 821 and an upper movable pulley 822; the fixed pulleys include a lower fixed pulley 831 and an upper fixed pulley 832; the fixed end of the main rope 811 is fixed to the lower end of the inner square tube 101 in the main arm structure, and the main rope 811 is fixed to the lower end of the inner square tube 101 in the main arm structure. The movable end passes around the lower movable pulley 821 and is fixedly connected to the end of the power rod 40; the core shaft of the lower movable pulley 821 is fixedly connected to the lower end of the middle rope 812, and the upper end of the middle rope 812 passes around the upper fixed pulley 832 provided at the upper end of the vertical arm structure (i.e., the top between the inner square tube 101 and the middle square tube 102), extends downward, passes around the upper movable pulley 822, extends upward, and is fixedly connected to the upper end of the vertical arm structure (i.e., the top of the middle square tube 102);

[0106] And, a slider 84 slidably connected to the main vertical arm structure (specifically, a slide rail 841 provided on the inner wall of the upper section of the outer square tube 103), the lower end of the slider 84 is connected to one end of the secondary rope 813, and the other end of the secondary rope 813 passes through the lower fixed pulley 831 fixed between the outer square tube 103 and the middle square tube 102 and is fixedly connected to the core shaft of the upper movable pulley 822;

[0107] A lever 85 is hinged to the slider 84, the inner end of the lever 85 is hinged to the slider 84, and the outer end of the lever 85 is provided with a cross arm 86 for hanging a counterweight or a counterweight operator;

[0108] A support arm 87 is hinged to the middle section of the lever 85, the upper end of the support arm 87 is hinged to the middle section of the lever 85, and the lower end of the support arm 87 is hinged to the outer side of the vertical arm structure (i.e., the outer side surface of the outer square tube 103);

[0109] In order to generate balanced assistance, a secondary upper fixed pulley 201 is also provided at the upper end of the secondary arm 20, and a secondary lower movable pulley 202, a secondary intermediate rope 204, and a secondary main rope 203 are provided in the inner cavity. The fixed end of the secondary main rope 203 is fixed to the lower end of the secondary arm 20, and the movable end of the secondary main rope 203 is fixedly connected to the other end of the power-assisting rod 40 after passing through the secondary lower movable pulley 202; the core shaft of the secondary lower movable pulley 202 is fixedly connected to the lower end of the secondary intermediate rope 204, and the upper end of the secondary intermediate rope 204 passes through the secondary upper fixed pulley 201 provided at the upper end of the secondary arm 20, passes through the central through hole of the cross bar 30, and then passes through the upper fixed pulley 832, and then extends downward, passes through the upper movable pulley 822, and extends upward to be fixedly connected to the upper end of the arm structure (i.e., the top of the middle square tube 102);

[0110] The downward pulling force generated by the counterweight or the counterweight athlete generates a reverse force through the lever 85, causing the slider 84 to move upward; the slider 84 then pulls the secondary rope to cause the upper movable pulley 822 to move downward, and the downward movement of the upper movable pulley 822 causes the lower ends of the middle rope 812 and the auxiliary middle rope 204 to move upward at twice the speed of the slider; the lower ends of the middle rope 812 and the auxiliary middle rope 204 generate an upward lifting force on the lower movable pulley 821 and the auxiliary lower movable pulley 202, causing the movable ends of the main rope 811 and the auxiliary main rope 203 to drive the power-assisting rod to move upward at four times the speed of the slider.

[0111] More specifically, the hinge point between the support arm 87 and the lever 85 is located in the middle section between the cross arm 86 and the inner end of the lever 85; a spring tension gauge 99 with a display interface facing outward is provided between the slider 84 and the secondary rope 813, which displays the actual counterweight force digitally or in pointer form. The counterweight user can adjust the size of the counterweight force by adjusting the suspension position.

[0112] More specifically, the outer end of the lever 85 is provided with a telescopic structure to adjust the distance between the cross arm and the hinge point. Figure 1 As shown in , the telescopic structure is a sliding structure (i.e., a slidable telescopic tube 851), and is provided with a locking cam 852 and a handle 853 connected thereto. When the handle 853 is tightened, the locking cam 852 will compress the sliding connection part of the telescopic tube 851 and the lever 85, thereby fixing the two.

[0113] More specifically, the outer side of the vertical arm structure (i.e., the lower section of the outer side surface of the outer square tube 103) is provided with a plurality of foot positions (i.e., the foot rod 1031 in the figure) at different heights located on the side below the horizontal arm, providing foot support positions for the counterweight athlete and adjusting the counterweight force according to different foot positions.

[0114] More specifically Figure 3As shown, the cross arm 86A is in an arc shape, which is convenient for the suspension athlete to adjust the position of the grip to adjust the counterweight; the booster rod 40 can also be made of square tube material. Figure 5A As shown, the support block 41 is adjusted in height with the assisting rod 40 by means of two positioning columns 42 and an adjusting column 43, wherein the adjusting column 43 is provided with a plurality of through holes 430, and the adjusting pin 44 passes through the adjusting hole provided on the assisting rod 40, and then passes through the through hole 430 on the matching adjusting column 43 to adjust the height of the support block 41 to accommodate pull-up exercisers of different heights.

[0115] like Figure 2 , Figure 4 and Figure 5 As shown, the three square tubes, the inner square tube 101, the middle square tube 102, and the outer square tube 103, which constitute the main arm 10, are fixedly connected by the threaded connection of the upper fixing plate 104 and the lower fixing plate 105. The upper and lower ends of the auxiliary arm 20 also have an upper fixing plate 21 and a lower fixing plate 22. The lower fixing plate 105 and the lower fixing plate 22 are provided with anchor bolt holes to achieve fixed connection with the ground or other fixed objects. The upper section of the outer square tube 103 is provided with a through groove 1030 to allow the lever 85 to pass through. The inner square tube 101 and the inner lower section of the auxiliary arm 20 are provided with a power-assisting groove 1010 and a power-assisting groove 200 to pass the power-assisting rod 40.

[0116] In order to reduce friction, reduce noise, and provide stable assistance, a bearing structure needs to be installed between the inner square tube 101, the inner lower section of the auxiliary arm 20 and the assist rod 40. A simple structure can be used, that is, a bearing is installed in the gap between the assist rod 40 and the assist groove 1010 and the assist groove 200. Considering that the assist rod is long, the two ends of the assist rod may not be completely synchronized under the lifting action of the pulley block. Therefore, if Figure 6 As shown, a connecting plate 45 is fixed at the end of the power rod 40, and a bearing seat 46 is provided on each side of the connecting plate 45 close to the power groove, and two bearings 47 acting on the inner square tube 101 or the inner wall of the auxiliary arm 20 are provided in the upper and lower directions of the bearing seat 46. A main rope connecting block 48 is provided in the other direction of the connecting plate 45.

[0117] Figure 7 and Figure 8The third specific embodiment of the adjustable pull-up device of the present invention is used for pull-up exercise after identity recognition, and can be used for exercise management of pull-up athletes to gradually improve the performance of pull-up athletes, and can also be used for paid exercise after identity recognition. The specific structure is: a locking mechanism is provided at the position of the through slot 1030 of the outer square tube 103, that is, a locking plate 106 hinged to one side of the through slot 1030 (specifically located above the slider 84 when in the lowest position), and a locking hook block 107 and an unlocking block 108 provided on the other side of the through slot 1030, the locking hook block 107 is fixed to the other side of the through slot 1030 by means of screws, etc., and the other side of the through slot 1030 is provided with a raised edge 1032 to block the locking hook block 107. The locking hook block 107 is also provided with a rotatable locking hook pin 1071, and the locking plate 106 is provided with a locking hook hole 1064 corresponding to the locking hook portion of the locking hook pin 1071. The outer side of the lock hook block 107 is fixed with an unlocking block 108 by means of screws. The unlocking block 108 is provided with an unlocking electromagnet 1081, and the unlocking block 108 also covers the lock hook block 107. The outer side of the unlocking block 108 is also provided with a locking identification circuit 1082, and the locking plate 106 is provided with an electronic tag 1062 at a position corresponding to the locking identification circuit 1082. When the electronic tag 1062 is close to the locking identification circuit 1082, it is identified as a locked state and the billing ends. The locking plate 106 is also blocked above the slider 84, and the slider 84 cannot move, that is, it cannot play a power-assisting role. The pull-up exerciser can freely complete the pull-up action without the effect of power assistance.

[0118] Among them, a hinge 1061 with a torsion spring is provided at the hinge between the through slot 1030 and the locking plate 106. After being unlocked, the locking plate 106 will automatically pop open and remain in the pop-open state, and will not block the position of the through slot 1030 and block the movement of the slider 84. Fig.12 The control circuit and other components in the system work together.

[0119] Since pull-ups require strong hand grip, and beginners have weak hand grip, gloves or hand hooks can be used. Therefore, a more specific implementation such as Fig. 8A As shown in the embodiment with the glove rental function, the inner side of the locking plate 106 is provided with two magnetic coupling grooves 1063 (two detection electrical contacts connected to the control circuit are provided in the grooves) for hanging gloves 109 (or hand protection hooks), and the gloves 109 are provided with a protrusion 1091 matching the shape of the magnetic coupling groove 1063, and two electrical pins for electrical connection provided in the protrusion 1091, and the two electrical pins correspond to the two detection electrical contacts. When identifying the locked state, it is simultaneously detected whether the two gloves 109 are put back to the inner side of the locking plate 106 (refer to Fig.14). Furthermore, considering the disinfection of the gloves 109, in a further embodiment, a disinfectant spray bottle with a spray port facing upward can be provided on the inner wall of the upper side of the through slot 1030, which can be used to clean and disinfect the hands of the pull-up exerciser. The sprayed disinfectant mist has a certain retention time and can continue to disinfect the gloves 109 on the inner side of the locking plate 106 in the locked state. Such a structure is ingenious, easy to use, multi-functional and low-cost.

[0120] In other embodiments, the telescopic structure may also be a spiral structure, the cross arm is fixedly connected to the screw rod, and a nut seat is provided at the outer end of the lever.

[0121] In other embodiments, there are two identical main arm structures, there can be two sliders, there can be two levers, the cross arm is arranged between the outer ends of the two levers, and the counterweight mover and the pull-up mover are in opposite directions or in the same direction.

[0122] like Figures 9 to 12 As shown, another embodiment of the power-assisted adjustable pull-up device of the present invention (using a dual-mode pulley block) includes a door-shaped bracket, the door-shaped bracket includes two vertical arm structures, and a crossbar arranged between the upper ends of the two vertical arm structures; the vertical arm structure includes a main vertical arm structure and a secondary vertical arm structure;

[0123] It also includes a booster rod disposed between the lower ends of the two vertical arm structures.

[0124] The two ends of the power rod are movably connected to the vertical arm structure; a support block is provided in the middle of the power rod to provide auxiliary support force for the pull-up exerciser;

[0125] and a slider connected to the vertical arm structure for sliding up and down movement, wherein the lower end of the slider is connected to one end of the secondary rope, and the other end of the secondary rope passes over the lower fixed pulley and is fixedly connected to the core shaft of the upper movable pulley;

[0126] A lever hinged to the slider, the inner end of the lever being hinged to the slider, and the outer end of the lever being provided with a cross arm for hanging a counterweight or a counterweight operator;

[0127] A support arm is hinged to the middle section of the lever, the upper end of the support arm is hinged to the middle section of the lever, and the lower end of the support arm is hinged to the outer side of the vertical arm structure;

[0128] The above structure and Figures 1 to 8 The difference lies in the following structure:

[0129] The vertical arm structure is provided with a double-mode pulley group, which includes three movable pulleys, a force-reducing main rope 711, a force-increasing main rope 712, four fixed pulleys, a force-reducing intermediate rope 713, a force-increasing intermediate rope 714 and a secondary rope 715; the movable pulley includes a force-reducing lower movable pulley 721, a force-increasing lower movable pulley 722 and an upper movable pulley 723; the fixed pulley includes a lower fixed pulley 731, an upper fixed pulley 732, a force-reducing fixed pulley 733 and a force-increasing fixed pulley 734; the force-reducing main rope The fixed end of the rope 711 is fixed to the lower end of the main vertical arm structure, and the movable end of the force-reducing main rope 711 passes upward around the force-reducing lower movable pulley 721 and is fixedly connected to the end of the power-assisting rod 40; the core shaft of the force-reducing lower movable pulley 721 is fixedly connected to the lower end of the force-reducing intermediate rope 713, and the upper end of the force-reducing intermediate rope 713 passes around the force-reducing fixed pulley 733 and the upper fixed pulley 732 provided at the upper end of the main vertical arm structure, extends downward, passes around the upper movable pulley 723, extends upward, and is fixedly connected to the upper end of the main vertical arm structure;

[0130] One end of the booster main rope 712 is fixed to the booster rod, and the other end is fixed to the core shaft of the booster lower movable pulley 722; one end of the booster intermediate rope 714 is fixed to the upper end of the auxiliary arm structure, and the other end passes through the booster lower movable pulley 722, the booster fixed pulley 734 and the upper fixed pulley 732 at the upper end of the auxiliary arm structure, extends downward, passes through the upper movable pulley 723, extends upward, and is fixedly connected to the upper end of the main arm structure;

[0131] The mode switching mechanism 70 is arranged between the core shaft 7210 of the force-reducing lower movable pulley 721 and the lower end of the force-reducing intermediate rope 713; when the mode switching mechanism 70 is opened, the core shaft 7210 of the force-reducing lower movable pulley 721 and the lower end of the force-reducing intermediate rope 713 are in a movable connection state, and the spring 701 arranged between the two is stretched when an external force acts, and retracted when there is no external force; when the mode switching mechanism 70 is closed, the core shaft 7210 of the force-reducing lower movable pulley 721 and the lower end of the force-reducing intermediate rope 713 are in a fixed connection state;

[0132] When the mode switching mechanism is closed, the pulling force generated by the counterweight or the counterweight mover downward generates a reverse force through the lever 85, causing the slider 84 to move upward; the slider 84 then pulls the secondary rope 715 to move the upper movable pulley 723 downward, and the downward movement of the upper movable pulley 723 causes the lower ends of the force-reducing intermediate rope 713 and the force-increasing intermediate rope 714 to move upward at twice the speed of the slider 84; the lower end of the force-reducing intermediate rope 713 generates an upward lifting force on the force-reducing lower movable pulley 721, causing the movable end of the force-reducing main rope 711 to drive the power-assisting rod to move the slider upward. 84 moves upward at four times the speed; the lower end of the force-increasing intermediate rope 714 generates an upward lifting force on the force-increasing lower movable pulley 722, so that the core shaft of the force-increasing lower movable pulley 722 and the force-increasing main rope 712 drive the other end of the power-assisting rod 40 to move upward at one time the speed of the slider 84. Since the speed is slower than the speed of the force-reducing lower movable pulley 721, the force-increasing main rope 712 is in a non-stressed state (a torsion spring can be fixed at the lower end of the force-increasing main rope 712 to automatically reel up the non-stressed force-increasing main rope 712), and it is in the force-reducing working mode at this time;

[0133] When the mode switching mechanism 70 is opened, the pulling force generated downward by the counterweight or the counterweight athlete generates a reverse force through the lever 85, causing the slider 84 to move upward; the slider 84 then pulls the secondary rope 715 to move the upper movable pulley 723 downward. The downward movement of the upper movable pulley 723 causes the lower ends of the force-reducing intermediate rope 713 and the force-increasing intermediate rope 714 to move upward at twice the speed of the slider 84; the lower end of the force-reducing intermediate rope 713 pulls the spring 701, generating an upward lifting force on the force-reducing lower movable pulley 721 equal to the spring force (because the spring force is much smaller than the power required by the pull-up person, in this case, the force-reducing lower movable pulley 722 and the force-reducing main rope 711 do not generate an effective lifting force); the lower end of the force-increasing intermediate rope 714 generates an upward lifting force on the force-increasing lower movable pulley 722, so that the core shaft of the force-increasing lower movable pulley 722 and the force-increasing main rope 712 drive the power-assisting rod 40 to move upward at one speed of the slider 84, and at this time it is in the force-increasing working mode.

[0134] More specifically, the mode switching mechanism 70 includes a pulley seat 700 for fixing the force-reducing lower movable pulley 721, a spring lower fixing pin 702 and a rotating shaft 703 arranged in the pulley seat 700, and a movable block 704 arranged between the spring 701 and the force-reducing intermediate rope 713; the rotating shaft 703 crosses the movable block 704; the pulley seat 700 is provided with a hollow groove 705 and slide grooves 706 arranged on both sides of the hollow groove 705, and the force-reducing lower movable pulley 721 is fixed at the lower end of the hollow groove 705; the bottom of the slide groove 706 is provided with an arc groove 7061 with a diameter greater than the width of the slide groove 706; the rotating shaft 703 crosses the movable block 704; the pulley seat 700 is provided with a hollow groove 705 and a sliding groove 706 arranged on both sides of the hollow groove 705, and the force-reducing lower movable pulley 721 is fixed at the lower end of the hollow groove 705; the bottom of the sliding groove 706 is provided with an arc groove 7061 with a diameter greater than the width of the sliding groove 706; A flat arc sleeve 7031 is fixedly connected to the position corresponding to the shaft 703 and the slide groove 706, the arc section of the flat arc sleeve 7031 cooperates with the arc groove 7061, and the flat section cooperates with the slide groove 706; when the pulling force of the spring 701 causes the flat arc sleeve 7031 to slide into the arc groove, the knob 7032 provided at the outer end of the rotating shaft 703 is turned to make the flat section of the flat arc sleeve 7031 perpendicular to the slide groove 706, the mode switching mechanism is in a closed state; when the knob is turned to make the flat section of the flat arc sleeve 7031 parallel to the slide groove, the mode switching mechanism is in an open state.

[0135] A mode switching mechanism is adopted. No matter it is the force reduction working mode or the force enhancement working mode, only one end of the power lever is subjected to force. Therefore, in order to prevent the jamming phenomenon when the power lever is lifted, the connection positions of the force reduction main rope and the force enhancement main rope with the power lever are located between the sliding connection positions of the two ends of the power lever and the vertical arm structure. Fig. 9 When square tubes are used as the main arm and the auxiliary arm, the inner square tube 101 and the inner side and the outer lower section of the auxiliary arm 20 are provided with power-assisting grooves, and the bearings are installed at the outer power-assisting grooves.

[0136] like Fig.13 As shown, an embodiment of the progressive pull-up training system 90 of the present invention adopts the above-mentioned adjustable assist pull-up device, and an upper force sensor 91 and a lower force sensor 92 are respectively provided at the handle position of the crossbar 30 and the support position of the assist rod 40 to detect the pulling force at the upper end and the supporting force at the lower end of the pull-up athlete; it also includes a control circuit 94 connected to the upper force sensor 91 and the lower force sensor 92, and a power circuit 941, a control button 942, a display screen 943 and a speaker 945 connected to the control circuit 94. This training system can obtain the exercise data of the pull-up athlete through the upper force sensor and the lower force sensor, and under the same assist condition, after reaching the set number of exercises (for example, 100 to 500 times), a voice reminder is given to adjust the assist force downward, so as to achieve the progressive growth of the exercise ability of the pull-up athlete.

[0137] More specifically, it also includes a locking mechanism (i.e., a locking plate) arranged at a position corresponding to the slider 84, and an unlocking mechanism for releasing the locked state (i.e., an unlocking electromagnet 944 connected to the control circuit 94). The control circuit is also connected to a locking identification circuit 1082 and an identity identification circuit 947. After the pull-up exerciser is identified through RFID identification, his / her exercise timing and / or billing are performed.

[0138] like Fig.14 The embodiment shown adopts the code scanning recognition method, realizes the online real-name verification and post-payment use and sports timing through the communication circuit 946, and also has the function of glove rental, and is provided with a glove recognition circuit 948 connected to the control circuit 94 for identifying whether the gloves are returned in place. The specific structure can be referred to Fig. 8A The embodiment shown.

[0139] In summary, the present invention can utilize the counterweight effect generated by the counterweight athlete or article (such as a school bag, backpack) through the provided lever and pulley group to generate upward assistance to the pull-up athlete, help him to complete the complete pull-up action, and then play a training role for the related sports muscle groups of the pull-up athlete, and then gradually reduce the counterweight force until the standard pull-up movement can be completed without the effect of the counterweight force. When a four-fold pulley group is used, it is suitable to use the counterweight athlete as a counterweight, that is, an athlete with a weight similar to that of the pull-up athlete. When it plays the role of counterweight, it is also performing suspension exercise, which plays a role of killing two birds with one stone. When a dual-mode pulley group is used, the mode switching mechanism can be used for switching. When it is closed, it is a force reduction mode, and the counterweight athlete (also known as a suspension athlete) can be used to generate counterweight to play a power-assisting role. When it is opened, it is a force increase mode, and the counterweight object (such as a school bag, backpack, etc.) can be used to generate counterweight to play a power-assisting role. A glove rental function is also provided, which is conducive to the finger protection of the pull-up athlete.

[0140] In general, the present invention can be widely used in public places such as schools, communities, and residential areas, helping most athletes who cannot complete the standard pull-up movements to gradually develop a passion for pull-ups with the assistance of the power-assisting rod, and improve the strength of the arm and chest muscles. It can provide equipment support for national sports, and has good economic and social benefits.

[0141] The above examples are only used to further illustrate the technical content of the present invention, so that readers can understand it more easily, but they do not mean that the implementation of the present invention is limited to this. Any technical extension or re-creation made according to the present invention is protected by the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A power-assisted adjustable pull-up device, characterized in that: It comprises a door-shaped bracket, wherein the door-shaped bracket comprises two vertical arm structures and a cross bar arranged between the upper ends of the two vertical arm structures; It also includes a booster rod disposed between the lower ends of the two vertical arm structures. The two ends of the power rod are movably connected to the vertical arm structure; a support block is provided in the middle of the power rod to provide auxiliary support force for the pull-up exerciser; At least one of the vertical arm structures is provided with a quadruple pulley group, which includes two movable pulleys, a main rope, two fixed pulleys, an intermediate rope and a secondary rope; the movable pulley includes a lower movable pulley and an upper movable pulley; the fixed pulley includes a lower fixed pulley and an upper fixed pulley; the fixed end of the main rope is fixed to the lower end of the vertical arm structure, and the movable end of the main rope is fixedly connected to the end of the power-assisting rod after passing through the lower movable pulley; the core shaft of the lower movable pulley is fixedly connected to the lower end of the intermediate rope, and the upper end of the intermediate rope passes through the upper fixed pulley provided at the upper end of the vertical arm structure, extends downward, passes through the upper movable pulley, extends upward, and is fixedly connected to the upper end of the vertical arm structure; and a slider connected to the vertical arm structure for sliding up and down movement, wherein the lower end of the slider is connected to one end of the secondary rope, and the other end of the secondary rope passes over the lower fixed pulley and is fixedly connected to the core shaft of the upper movable pulley; a lever hinged to the slider, the inner end of the lever being hinged to the slider, and the outer end of the lever being provided with a cross arm for hanging a counterweight or a counterweight operator; A support arm hinged to the middle section of the lever, wherein the upper end of the support arm is hinged to the middle section of the lever, and the lower end of the support arm is hinged to the outer side of the vertical arm structure; The downward pulling force generated by the counterweight or the counterweight athlete generates a reverse force through the lever, causing the slider to move upward; the slider then pulls the secondary rope to move the upper movable pulley downward, and the downward movement of the upper movable pulley causes the lower end of the intermediate rope to move upward at twice the speed of the slider; the lower end of the intermediate rope generates an upward lifting force on the lower movable pulley, causing the movable end of the main rope to drive the power-assisting rod to move upward at four times the speed of the slider.

2. The adjustable pull-up device according to claim 1, characterized in that The hinge point between the support arm and the lever is located in the middle section between the cross arm and the inner end of the lever; a spring tension meter with a display interface facing outward is provided between the slider and the secondary rope, which displays the actual counterweight force digitally or in pointer form.

3. The adjustable pull-up device according to claim 2, characterized in that The outer end of the lever is provided with a telescopic structure to adjust the distance between the cross arm and the hinge point.

4. The adjustable pull-up device according to claim 3, characterized in that The telescopic structure is a spiral structure, the cross arm is fixedly connected to the screw rod, and a nut seat is provided at the outer end of the lever; or, the telescopic structure is a sliding structure, and is provided with a locking cam and a handle connected thereto.

5. The adjustable pull-up device according to claim 4, characterized in that The outer side of the vertical arm structure is provided with a foot support position located on the side below the horizontal arm to provide a foot support position for the weight-bearing athlete.

6. The adjustable pull-up device according to claim 5, characterized in that There are two sliders, two levers, the cross arm is arranged between the outer ends of the two levers, and the weight mover and the pull-up mover are in opposite directions or in the same direction; Alternatively, there is one slider, and the two middle ropes generate power through the same upper movable pulley; the middle rope away from the slider passes through the middle or top of the cross bar.

7. A power-assisted adjustable pull-up device, characterized in that: It comprises a door-shaped bracket, wherein the door-shaped bracket comprises two vertical arm structures and a cross bar arranged between the upper ends of the two vertical arm structures; It also includes a booster rod disposed between the lower ends of the two vertical arm structures. The two ends of the power rod are movably connected to the vertical arm structure; a support block is provided in the middle of the power rod to provide auxiliary support force for the pull-up exerciser; The vertical arm structure is provided with a double-mode pulley group, which includes three movable pulleys, a force-reducing main rope, a force-increasing main rope, four fixed pulleys, a force-reducing intermediate rope, a force-increasing intermediate rope and a secondary rope; the movable pulley includes a force-reducing lower movable pulley, a force-increasing lower movable pulley and an upper movable pulley; the fixed pulley includes a lower fixed pulley, an upper fixed pulley, a force-reducing fixed pulley and a force-increasing fixed pulley; the vertical arm structure includes a main vertical arm structure and a secondary vertical arm structure; The fixed end of the force-reducing main rope is fixed to the lower end of the main vertical arm structure, and the movable end of the force-reducing main rope is passed upward around the force-reducing lower movable pulley and then fixedly connected to the end of the power-assisting rod; the core shaft of the force-reducing lower movable pulley is fixedly connected to the lower end of the force-reducing intermediate rope, and the upper end of the force-reducing intermediate rope passes around the force-reducing fixed pulley and the upper fixed pulley arranged at the upper end of the main vertical arm structure, extends downward, passes around the upper movable pulley, extends upward, and is fixedly connected to the upper end of the main vertical arm structure; One end of the booster main rope is fixed to the booster rod, and the other end is fixed to the core shaft of the booster lower movable pulley; one end of the booster intermediate rope is fixed to the upper end of the auxiliary arm structure, and the other end passes around the booster lower movable pulley, the booster fixed pulley and the upper fixed pulley provided at the upper end of the auxiliary arm structure, extends downward, passes around the upper movable pulley, extends upward, and is fixedly connected to the upper end of the main arm structure; A mode switching mechanism is provided between the core shaft of the force-reducing lower movable pulley and the lower end of the force-reducing intermediate rope; when the mode switching mechanism is turned on, the core shaft of the force-reducing lower movable pulley and the lower end of the force-reducing intermediate rope are in a movable connection state, and a spring provided between the two is stretched when an external force acts, and retracted when no external force acts; when the mode switching mechanism is turned off, the core shaft of the force-reducing lower movable pulley and the lower end of the force-reducing intermediate rope are in a fixed connection state; and a slider connected to the vertical arm structure for sliding up and down movement, wherein the lower end of the slider is connected to one end of the secondary rope, and the other end of the secondary rope passes over the lower fixed pulley and is fixedly connected to the core shaft of the upper movable pulley; a lever hinged to the slider, the inner end of the lever being hinged to the slider, and the outer end of the lever being provided with a cross arm for hanging a counterweight or a counterweight operator; A support arm hinged to the middle section of the lever, wherein the upper end of the support arm is hinged to the middle section of the lever, and the lower end of the support arm is hinged to the outer side of the vertical arm structure; When the mode switching mechanism is closed, the downward pulling force generated by the counterweight or counterweight athlete generates a reverse force through the lever, causing the slider to move upward; the slider then pulls the secondary rope to cause the upper movable pulley to move downward, and the downward movement of the upper movable pulley causes the lower ends of the force-reducing intermediate rope and the force-amplifying intermediate rope to move upward at twice the speed of the slider; the lower end of the force-reducing intermediate rope generates an upward lifting force on the force-reducing lower movable pulley, so that the active end of the force-reducing main rope drives the power-assisting rod to move upward at four times the speed of the slider; the lower end of the force-amplifying intermediate rope generates an upward lifting force on the force-amplifying lower movable pulley, so that the core shaft of the force-amplifying lower movable pulley and the force-amplifying main rope drive the power-assisting rod to move upward at one times the speed of the slider, thereby making the force-amplifying main rope in a non-stressed state, and at this time it is in the force-reducing working mode; When the mode switching mechanism is turned on, the downward pulling force generated by the counterweight or the counterweight athlete generates a reverse force through the lever, causing the slider to move upward; the slider then pulls the secondary rope to move the upper movable pulley downward, and the downward movement of the upper movable pulley causes the lower ends of the force-reducing intermediate rope and the force-amplifying intermediate rope to move upward at twice the speed of the slider; the lower end of the force-reducing intermediate rope pulls the spring to generate an upward lifting force on the force-reducing lower movable pulley equal to the spring force; the lower end of the force-amplifying intermediate rope generates an upward lifting force on the force-amplifying lower movable pulley, causing the core shaft of the force-amplifying lower movable pulley and the force-amplifying main rope to drive the power-assisting rod to move upward at one speed of the slider, and it is now in the force-amplifying mode.

8. The adjustable pull-up device according to claim 7, characterized in that The mode switching mechanism comprises a pulley seat for fixing the force-reducing lower movable pulley, a spring lower fixing pin and a rotating shaft arranged in the pulley seat, and a movable block arranged between the spring and the force-reducing intermediate rope; the rotating shaft crosses the movable block; the pulley seat is provided with a hollow groove and a slide groove arranged on both sides of the hollow groove, and the force-reducing lower movable pulley is fixed at the lower end of the hollow groove; the bottom of the slide groove is provided with an arc groove with a diameter greater than the width of the slide groove; a flat arc sleeve is fixedly connected to the position of the rotating shaft corresponding to the slide groove, the arc section of the flat arc sleeve cooperates with the arc groove, and the flat section cooperates with the slide groove; when the tension of the spring causes the flat arc sleeve to slide into the arc groove, the knob provided at the outer end of the rotating shaft is turned to make the flat section of the flat arc sleeve perpendicular to the slide groove, the mode switching mechanism is in a closed state; when the knob is turned to make the flat section of the flat arc sleeve parallel to the slide groove, the mode switching mechanism is in an open state.

9. Progressive pull-up training system, characterized by The power-assisted adjustable pull-up device according to any one of claims 1 to 8 is adopted, wherein an upper force sensor and a lower force sensor are respectively provided at the handle position of the cross bar and the supporting position of the power-assisted rod to detect the pulling force at the upper end and the supporting force at the lower end of the person exercising upward; and the device also includes a control circuit connected to the upper force sensor and the lower force sensor, and a power circuit, control buttons and display screen connected to the control circuit.

10. The progressive pull-up training system according to claim 9, characterized in that: It also includes a locking mechanism arranged at the lower end or side position of the slider, and an unlocking mechanism for releasing the locked state. The control circuit is also connected to a locking identification circuit and an identity identification circuit. After the pull-up exerciser is identified through RFID identification or code scanning identification, the exercise timing and / or billing is performed.

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