CN213994698U - Traction mechanism and household flying bird trainer - Google Patents

Abstract

The utility model provides a traction mechanism, which comprises a connecting seat arranged on a stand column, a first pulley block and a third pulley block arranged on a top beam, a second pulley block arranged on a bottom beam, a movable pulley connected with a balancing weight, a traction rope and a handle belt; the connecting seat is rotationally connected with two guide pulleys which are distributed at intervals up and down, and is also rotationally connected with an intermediate pulley positioned between the two guide pulleys; the wheel groove of the middle pulley and the wheel groove of the upper guide pulley enclose a first leading-out channel, and the wheel groove of the middle pulley and the wheel groove of the lower guide pulley enclose a second leading-out channel; one end of the traction rope is provided with a first limit connecting piece, and the other end of the traction rope sequentially passes through the first leading-out channel, each pulley block and the second leading-out channel and is provided with a second limit connecting piece; the handle belt is detachably connected with the first limit connecting piece and/or the second limit connecting piece. The utility model also provides an adopted above-mentioned tractive mechanism's domestic flying bird training ware.

Description

Traction mechanism and household flying bird trainer

Technical Field

The utility model belongs to the technical field of body-building apparatus, more specifically say, relate to a tractive mechanism and domestic bird training ware.

Background

The flying bird training is a body-building project welcomed by body-building enthusiasts, common flying bird training equipment adopts a structural form that a steel wire rope pulls a balance weight through a pulley block, one end of the steel wire rope is fixed with a trainer bracket, the other end of the steel wire rope is connected with the balance weight through a movable pulley block, the other end of the steel wire rope is turned by a plurality of fixed pulleys and then extends to a position suitable for being pulled by body-building personnel, the structural form can only adjust the load through adjusting the number of the balance weights, therefore, in order to meet the exercise of the body-building personnel under different load conditions, the number of the balance weights needing to be equipped is large, in addition, in order to meet the balance weight movement space, a large balance weight box body needs to be arranged, the structures directly determine that the flying bird training equipment needs to occupy a large space, are expensive, cannot be suitable for home body-building training, and can be equipped only in professional body-building places generally, thereby limiting the market audience range of the bird trainer.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a traction mechanism and domestic bird training ware aim at solving prior art's bird training ware because of occupation space is big, the expensive and unable domestic problem that is fit for.

In order to achieve the above object, the utility model adopts the following technical scheme: providing a traction mechanism, which comprises a connecting seat, a first pulley block, a second pulley block, a third pulley block, a movable pulley, a traction rope and a handle belt; the connecting seat is used for being connected to an upright post of the trainer, is rotatably connected with two guide pulleys distributed at intervals up and down, and is also rotatably connected with an intermediate pulley positioned between the two guide pulleys; the wheel groove of the middle pulley and the wheel groove of the upper guide pulley enclose a first leading-out channel, and the wheel groove of the middle pulley and the wheel groove of the lower guide pulley enclose a second leading-out channel; the first pulley block is connected to the top beam of the trainer; the second pulley block is connected to a bottom beam of the trainer; the third pulley block is connected to the top beam of the trainer; the movable pulley is connected with a balancing weight of the trainer; one end of the traction rope is provided with a first limit connecting piece abutted against the connecting seat, the other end of the traction rope sequentially passes through the first leading-out channel, the first pulley block, the movable pulley, the third pulley block, the second pulley block and the second leading-out channel to extend out in the direction far away from the connecting seat, and the extending end of the traction rope is provided with a second limit connecting piece abutted against the connecting seat; the handle belt is detachably connected with the first limit connecting piece and/or the second limit connecting piece.

As another embodiment of the present application, the first pulley block includes a first fixed pulley located right above the connecting seat and a second fixed pulley located above the counterweight block side; the second pulley block comprises a third fixed pulley positioned right below the connecting seat and a fourth fixed pulley positioned below the side of the counterweight block; the third pulley block comprises at least one fifth fixed pulley, and the number of the pulley grooves of the movable pulley corresponds to the number of the fifth fixed pulleys.

As another embodiment of the present application, the third pulley block comprises two fifth fixed pulleys, and the movable pulley comprises a wheel shaft and two sheaves; wherein, the axial center position of the wheel shaft is provided with a screw rod extending along the radial direction of the wheel shaft, and the screw rod is used for being screwed with the connecting sleeve of the balancing weight; the two grooved wheels are respectively connected with the wheel shaft in a rotating way and are symmetrically distributed on two sides of the screw rod.

As another embodiment of the present application, the connecting seat includes a sleeve and a swing frame; wherein, the sleeve is sleeved on the upright post; the swing frame is hinged with the sleeve along the axial direction of the sleeve; two guide pulleys and middle pulley are all located on the rocker.

As another embodiment of the application, the sleeve is connected with the upright post in a sliding way along the axial direction of the upright post; the sleeve is provided with a positioning plug-in which is used for being plugged with one jack arranged on the upright post.

As another embodiment of the present application, the positioning insert comprises a fixing sleeve and a pin; wherein, the fixed sleeve is arranged on the wall of the sleeve, and the inner hole is communicated with the inside of the sleeve; the bolt is arranged in the fixed sleeve in a penetrating way, one end of the bolt is inserted into the jack, and the other end of the bolt extends out of the outer side of the fixed sleeve and is provided with an operating handle.

As another embodiment of this application, the telescopic one end inner wall of keeping away from of fixed cover is equipped with first ka tai, and the end of pegging graft of bolt is equipped with the second ka tai, and the cover is equipped with the elastic component on the bolt, and the one end and the first ka tai butt of elastic component, the other end and second ka tai butt.

As another embodiment of the application, the first limit connecting piece and the second limit connecting piece both comprise a limit block and a retaining ring; the limiting block is sleeved on the traction rope and is abutted against the side wall of the connecting seat, which is far away from the upright post; the retaining ring is arranged on the limiting block in a penetrating way and is sleeved with the handle belt.

The utility model provides a traction mechanism's beneficial effect lies in: compared with the prior art, the traction mechanism of the utility model has the advantages that the connecting seat is combined with the middle pulley through the two guide pulleys to form the first leading-out channel and the second leading-out channel, the traction rope is guided and turned through the first pulley block, the second pulley block and the third pulley block and is connected with the balancing weight through the movable pulley, and when the light load training is carried out, the handle belt can be connected with the first limit connecting piece or the second limit connecting piece to carry out traction exercise; when heavy load training is carried out, the handle belt can be simultaneously connected with the first limit connecting piece and the second limit connecting piece to carry out traction exercise; through the mode of selecting single to draw or two to draw the exercise, can make traction force have great adjustment range under the condition of less balancing weight quantity to can reduce the quantity of the balancing weight of flying bird training ware, and then can reduce the whole occupation space and the cost of flying bird training ware, reduce the product price, make flying bird training ware be suitable for house body building exercise, can improve its market audience scope, improve the market competition of product.

The utility model also provides a domestic flying bird training ware, including support, counter weight component to and above-mentioned traction mechanism.

As another embodiment of the present application, the counterweight assembly includes two sets of counterweights; two stand columns are arranged on the support at intervals, each stand column is connected with a traction structure, and the two traction mechanisms are respectively connected with the two groups of balancing weights correspondingly.

The utility model provides a domestic flying bird training ware has adopted above-mentioned traction mechanism, has the same beneficial effect with above-mentioned traction mechanism, no longer gives unnecessary details here.

Drawings

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

Fig. 1 is a schematic structural diagram of a drawing mechanism according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of a connection seat according to an embodiment of the present invention;

fig. 3 is a schematic perspective view of a movable pulley used in the embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a positioning insert used in an embodiment of the present invention;

fig. 5 is a schematic perspective view of a first limit connector and a second limit connector according to an embodiment of the present invention.

In the figure: 1. a connecting seat; 101. a first lead-out channel; 102. a second lead-out channel; 11. a sleeve; 12. placing a frame; 13. positioning the plug-in; 130. an operating handle; 131. fixing a sleeve; 1311. a first chuck table; 132. a bolt; 1321. a second chuck table; 133. an elastic member; 14. a middle pulley; 15. a guide pulley; 2. a first pulley block; 21. a first fixed pulley; 22. a second fixed pulley; 3. a second pulley block; 31. a third fixed pulley; 32. a fourth fixed pulley; 4. a third pulley block; 40. a fifth fixed pulley; 5. a movable pulley; 51. a wheel axle; 52. a grooved wheel; 53. a screw; 6. a hauling rope; 601. a limiting block; 602. a retaining ring; 61. a first limit connector; 62. a second limit connecting piece; 7. a handle strap; 8. a support; 80. a jack; 81. a column; 82. a top beam; 83. a bottom beam; 9. a counterweight assembly.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 and fig. 2 together, the drawing mechanism of the present invention will now be described. The traction mechanism comprises a connecting seat 1, a first pulley block 2, a second pulley block 3, a third pulley block 4, a movable pulley 5, a traction rope 6 and a handle belt 7; the connecting seat 1 is used for being connected to a stand column 81 of the trainer, is rotatably connected with two guide pulleys 15 which are distributed at intervals up and down, and is also rotatably connected with a middle pulley 14 positioned between the two guide pulleys 15; the wheel groove of the middle pulley 14 and the wheel groove of the upper guide pulley 15 enclose a first leading-out channel 101, and the wheel groove of the middle pulley 14 and the wheel groove of the lower guide pulley 15 enclose a second leading-out channel 102; the first pulley block 2 is connected to the top beam 82 of the trainer; the second pulley block 3 is connected to a bottom beam 83 of the trainer; the third pulley block 4 is connected to the top beam 82 of the trainer; the movable pulley 5 is connected with a balancing weight of the trainer; one end of the traction rope 6 is provided with a first limit connecting piece 61 abutted against the connecting seat 1, the other end of the traction rope sequentially passes through the first leading-out channel 101, the first pulley block 2, the movable pulley 5, the third pulley block 4, the second pulley block 3 and the second leading-out channel 102 to extend out in the direction far away from the connecting seat 1, and the extending end of the traction rope is provided with a second limit connecting piece 62 abutted against the connecting seat 1; the handle belt 7 is detachably connected with the first limit connector 61 and/or the second limit connector 62.

The utility model provides a traction mechanism's working method does: when the training load required by the body builder is smaller, the pull handle belt 7 is connected with the first limit connecting piece 61 (or the second limit connecting piece 62) in a hanging mode, the second limit connecting piece 62 (or the first limit connecting piece 61) is enabled to be in butt joint with the mouth of the second leading-out channel 102 (or the first leading-out channel 101), and the traction rope 6 sequentially passes through the first pulley block 2, the movable pulley 5, the third pulley block 4 and the second pulley block 3 to change direction and transmit through the traction pull handle belt 7, so that the balancing weight is pulled to move up and down; when the required training load of fitness personnel is great (surpassing the load that increases the quantity scope production of balancing weight), can be with handle area 7 and first spacing connecting piece 61, second spacing connecting piece 62 articulates simultaneously, make the both ends of haulage rope 6 produce the effort to the balancing weight simultaneously through pulling handle area 7, thereby make the balancing weight carry out up-and-down motion, this moment because the both ends of haulage rope 6 have equal traction force to the balancing weight simultaneously, consequently be equivalent to the twice of the effort that adopts single-pull mode, that is to say, to the fitness personnel, the required traction force of applying at the both ends of pulling haulage rope 6 is the twice of the required traction force of pulling one of them end.

Compared with the prior art, the traction mechanism provided by the utility model has the advantages that the connecting seat 1 is combined with the middle pulley 14 through the two guide pulleys 15 to form the first leading-out channel 101 and the second leading-out channel 102, the traction rope 6 is guided and turned through the first pulley block 2, the second pulley block 3 and the third pulley block 4 and is connected with the balancing weight through the movable pulley 5, and when light load training is carried out, the handle belt 7 can be connected with the first limit connecting piece 61 or the second limit connecting piece 62 to carry out traction exercise; when heavy load training is carried out, the handle belt 7 can be simultaneously connected with the first limit connecting piece 61 and the second limit connecting piece 62 to carry out traction exercise; through the mode of selecting single to draw or two to draw the exercise, can make traction force have great adjustment range under the condition of less balancing weight quantity to can reduce the quantity of the balancing weight of flying bird training ware, and then can reduce the whole occupation space and the cost of flying bird training ware, reduce the product price, make flying bird training ware be suitable for house body building exercise, can improve its market audience scope, improve the market competition of product.

As a specific embodiment of the traction mechanism provided by the present invention, please refer to fig. 1, the first pulley block 2 includes a first fixed pulley 21 located right above the connecting seat 1 and a second fixed pulley 22 located above the counterweight block side; the second pulley block 3 comprises a third fixed pulley 31 positioned right below the connecting seat 1 and a fourth fixed pulley 32 positioned below the counterweight block side; the third pulley block 4 comprises at least one fifth fixed pulley 40, and the number of the pulley grooves of the movable pulley 5 corresponds to the number of the fifth fixed pulleys 40. The effect of each fixed pulley lies in making haulage rope 6 carry out the diversion in reasonable position, the race quantity and the traction force inverse ratio of movable pulley 5, that is to say, haulage rope 6 is walked around movable pulley 5 race quantity more, it is less with the required pulling force of balancing weight of quality to pull, through rationally setting up each fixed pulley and movable pulley 5, thereby the realization can enough be used for pulling the one end of haulage rope 6 and temper, can stimulate the both ends of haulage rope 6 simultaneously and carry out doubly doing all can (when single drawing) and temper, and easy operation is convenient, therefore, the clothes hanger is strong in practicability.

In the present embodiment, referring to fig. 1 and fig. 3, the third pulley block 4 includes two fifth fixed pulleys 40, and the movable pulley 5 includes a wheel shaft 51 and two grooved wheels 52; wherein, the axial center position of the wheel shaft 51 is provided with a screw 53 extending along the radial direction thereof, and the screw 53 is used for being screwed with a connecting sleeve of a balancing weight; the two grooved wheels 52 are respectively connected with the wheel shaft 51 in a rotating way and are symmetrically distributed on two sides of the screw 53. The two movable pulleys 5 respectively correspond to the two fifth fixed pulleys 40, and according to the mechanics transmission theory, when one end of the traction rope 6 is pulled, the required tension is one fourth of the weight of the counterweight block, and when the two ends of the traction rope 6 are pulled simultaneously, the required tension is one half of the weight of the counterweight block, so that the load adjustment range is enlarged on the premise of not increasing the number of the counterweight blocks; in addition, the movable pulley 5 is connected with the connecting sleeve of the balancing weight in a rotating mode through the screw 53, the connection is convenient, and the balancing weight is stable in stress.

As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1 and 2, the connecting seat 1 includes a sleeve 11 and a swing frame 12; wherein, the sleeve 11 is sleeved on the upright column 81; the swing frame 12 is hinged with the sleeve 11 along the axial direction of the sleeve 11; two guide pulleys 15 and an intermediate pulley 14 are provided on the swing frame 12. In the training process of the body-building personnel, the swing frame 12 can drive the direction change of the traction rope 6 to swing along with the body-building action, so that the first leading-out channel 101 and the second leading-out channel 102 are aligned with the power-generating arms of the body-building personnel respectively, the smooth and light movement of the traction rope 6 in the guide pulley 15 is ensured, the extra resistance (equivalent to the passive load increase) caused by the angle problem between the guide pulley 15 and the traction rope 6 is avoided, the matching of the training load and the actual demand of the body-building personnel is ensured, and the good body-building effect is ensured.

In the present embodiment, referring to fig. 1 and fig. 2, the sleeve 11 is slidably connected to the upright 81 along the axial direction of the upright 81; the sleeve 11 is provided with a positioning plug 13, and the positioning plug 13 is used for being plugged with one of the jacks 80 arranged on the upright 81. The height of the sleeve 11 can be adjusted, so that the height of the handle belt 7 is matched with the height of a body builder and the requirements of body building projects, and the use is flexible and convenient; after the sleeve 11 slides in place, the positioning plug 13 is inserted into the insertion hole 80 on the upright 81 for positioning, so that the sleeve 11 is prevented from freely sliding on the upright 81, and the stability of the exercise process is ensured.

Specifically, referring to fig. 4, the positioning insert 13 includes a fixing sleeve 131 and a plug 132; wherein, the fixed sleeve 131 is arranged on the wall of the sleeve 11, and the inner hole is communicated with the interior of the sleeve 11; the plug 132 is inserted into the fixing sleeve 131, one end of the plug is inserted into the insertion hole 80, and the other end of the plug extends out of the fixing sleeve 131 and is provided with an operating handle 130. Through push-and-pull operating handle 130, can drive bolt 132 and slide in fixed cover 131 to realize pegging graft or breaking away from between bolt 132 and the corresponding jack 80, simple structure, convenient operation.

Further, referring to fig. 4, a first locking platform 1311 is disposed on an inner wall of one end of the fixing sleeve 131 away from the sleeve 11, a second locking platform 1321 is disposed on an insertion end of the plug 132, the plug 132 is sleeved with the elastic member 133, one end of the elastic member 133 abuts against the first locking platform 1311, and the other end abuts against the second locking platform 1321. Exert towards the gliding elastic force of jack 80 direction through elastic component 133 (specifically can be the spring) to bolt 132, when sleeve 11 need slide, can be through pulling handle 130, overcome the elastic force of elastic component 133 and make bolt 132 break away from jack 80, loosen handle 130 after the adjustment is accomplished, bolt 132 can kick-back automatically under the elastic action of elastic component 133 to pegging graft with corresponding jack 80, and utilize the elastic force of spring to avoid bolt 132 to deviate from in the jack 80 automatically after pegging graft, improve grafting stability.

As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1 and 5, the first limiting connector 61 and the second limiting connector 62 both include a limiting block 601 and a retaining ring 602; the limiting block 601 is sleeved on the traction rope 6 and is abutted against the side wall of the connecting seat 1 departing from the upright column 81; the retaining ring 602 is disposed on the limiting block 601 in a penetrating manner and is sleeved with the handle strap 7. The limiting block 601 is abutted against the side wall of the connecting seat 1, so that the limiting block 601 is prevented from being embedded into the first leading-out channel 101 or the second leading-out channel 102 under the pulling force, and the leading-out end of the traction rope 6 is ensured to be fixed reliably; the retaining ring 602 is a retaining ring 602 with an elastic blocking piece, and the retaining ring 602 is detached from the handle band 7 after the mouth of the retaining ring 602 is opened by pressing the elastic blocking piece, so that the connection is stable and reliable, and the detachment is convenient.

The utility model also provides a domestic flying bird training ware. Referring to fig. 1 to 5, the domestic bird trainer comprises a support 8, a counterweight assembly 9, and the above-mentioned pulling mechanism.

The utility model provides a domestic flying bird training ware has adopted above-mentioned traction mechanism, forms first drawing channel 101 and second drawing channel 102 through two guide pulleys 15 and the combination of intermediate pulley 14 on connecting seat 1, and haulage rope 6 is through the guide diversion of first assembly pulley 2, second assembly pulley 3, third assembly pulley 4 to be connected with the balancing weight through movable pulley 5, when carrying out the underloading training, can be connected handle area 7 and first spacing connecting piece 61 or second spacing connecting piece 62 and carry out the tractive exercise; when heavy load training is carried out, the handle belt 7 can be simultaneously connected with the first limit connecting piece 61 and the second limit connecting piece 62 to carry out traction exercise; through the mode of selecting single to draw or two to draw the exercise, can make traction force have great adjustment range under the condition of less balancing weight quantity to can reduce the quantity of the balancing weight of flying bird training ware, and then can reduce the whole occupation space and the cost of flying bird training ware, reduce the product price, make flying bird training ware be suitable for house body building exercise, can improve its market audience scope, improve the market competition of product.

As a specific embodiment of the household flying bird trainer of the present invention, please refer to fig. 1, the counterweight assembly 9 includes two sets of counterweights; two stand columns 81 are arranged on the support 8 at intervals, each stand column 81 is connected with a traction structure, and the two traction mechanisms are respectively connected with the two groups of balancing weights correspondingly. It should be noted that fig. 1 shows a half structure of the support 8, and the two upright posts 81 and the two sets of weight components 9 of this embodiment are respectively disposed on two sides of the whole support 8, so as to be suitable for a two-hand bird training action, and have strong practicability.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A pulling mechanism, comprising:

the connecting seat is used for being connected to an upright post of the trainer, is rotatably connected with two guide pulleys which are distributed at intervals up and down, and is also rotatably connected with an intermediate pulley positioned between the two guide pulleys; the wheel groove of the middle pulley and the wheel groove of the guide pulley above enclose a first leading-out channel, and the wheel groove of the middle pulley and the wheel groove of the guide pulley below enclose a second leading-out channel;

the first pulley block is connected to the top beam of the trainer;

the second pulley block is connected to the bottom beam of the trainer;

the third pulley block is connected to the top beam of the trainer;

the movable pulley is connected with a balancing weight of the trainer;

one end of the traction rope is provided with a first limit connecting piece abutted against the connecting seat, the other end of the traction rope sequentially penetrates through the first leading-out channel, the first pulley block, the movable pulley, the third pulley block, the second pulley block and the second leading-out channel to extend out in the direction far away from the connecting seat, and the extending end of the traction rope is provided with a second limit connecting piece abutted against the connecting seat;

the handle belt is detachably connected with the first limiting connecting piece and/or the second limiting connecting piece.

2. The pulling mechanism of claim 1, wherein the first set of pulleys comprises a first fixed pulley directly above the connection receptacle and a second fixed pulley laterally above the counterweight; the second pulley block comprises a third fixed pulley positioned right below the connecting seat and a fourth fixed pulley positioned below the side of the counterweight block; the third pulley block comprises at least one fifth fixed pulley, and the number of the pulley grooves of the movable pulley corresponds to the number of the fifth fixed pulleys.

3. The pulling mechanism of claim 2, wherein the third set of pulleys comprises two of the fifth fixed pulleys, and wherein the movable pulley comprises:

the axial center of the wheel shaft is provided with a screw rod extending along the radial direction of the wheel shaft, and the screw rod is used for being screwed with the connecting sleeve of the balancing weight;

and the two grooved wheels are respectively in rotating connection with the wheel shaft and are symmetrically distributed on two sides of the screw rod.

4. The pulling mechanism of claim 1, wherein the connection receptacle comprises:

the sleeve is sleeved on the upright post;

the swing frame is hinged with the sleeve along the axial direction of the sleeve; the two guide pulleys and the middle pulley are arranged on the swing frame.

5. The pulling mechanism of claim 4, wherein the sleeve is slidably coupled to the column in an axial direction of the column; the sleeve is provided with a positioning plug-in which is used for being plugged with one jack arranged on the upright post.

6. The pulling mechanism of claim 5, wherein the positioning insert comprises:

the fixed sleeve is arranged on the wall of the sleeve, and an inner hole is communicated with the interior of the sleeve;

and the bolt penetrates through the fixed sleeve, one end of the bolt is inserted into the jack, and the other end of the bolt extends out of the outer side of the fixed sleeve and is provided with an operating handle.

7. The pulling mechanism as defined in claim 6, wherein a first engaging portion is formed on an inner wall of an end of the fixing sleeve away from the sleeve, a second engaging portion is formed on an inserting end of the bolt, an elastic member is sleeved on the bolt, and one end of the elastic member abuts against the first engaging portion and the other end abuts against the second engaging portion.

8. The pulling mechanism of any one of claims 1 to 7, wherein the first limit connector and the second limit connector each comprise:

the limiting block is sleeved on the traction rope and is abutted against the side wall of the connecting seat, which is far away from the upright post;

the retaining ring is arranged on the limiting block in a penetrating mode and is sleeved with the handle belt.

9. A domestic bird trainer comprising a support, a counterweight assembly and a pulling mechanism according to any one of claims 1 to 8.

10. The home bird trainer of claim 9, wherein the counterweight assembly comprises two sets of the counterweights; the support is provided with two stand columns at intervals, each stand column is connected with the traction structure, and the two traction mechanisms are respectively and correspondingly connected with the two groups of balancing weights.

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