Pre-tightening frame for erecting power transmission line

Abstract

The utility model discloses a pre-tightening frame for erecting a power transmission line, which comprises a bottom plate, a rolling mechanism fixedly mounted on the top surface of the bottom plate, a power transmission line wound on the outer wall of the rolling mechanism, and a processing assembly arranged above the bottom plate, and the processing assembly comprises a cleaning assembly arranged above the bottom plate, when a power transmission line is erected, the power transmission line needs to be pre-tightened, the power transmission line is pre-tightened through the winding mechanism, when the power transmission line is wound, it needs to be guaranteed that the outer wall of the power transmission line is clean, the power transmission line penetrates through the interior of a rotary drum, and under the limitation of magnetic repulsion of a first magnetic ring and a second magnetic ring, the power transmission line can be conveniently wound. When the winding mechanism rotates to wind the power transmission line, the winding mechanism drives the reciprocating lead screw to rotate through the second belt pulley set, the first belt pulley set fixedly arranged on the outer wall of the reciprocating lead screw in a sleeving mode drives the rotating rod to rotate along with the reciprocating lead screw, and the gear fixedly installed at the end of the rotating rod rotates along with the rotating rod.

Description

TECHNICAL FIELD

[0001] The utility model relates to power transmission line pre -tension technical field, concretely is a kind of pre -tension frame for power transmission line erection. BACKGROUND

[0002] Power transmission line erection refers to according to the engineering planning design scheme of power transmission line, using a series of construction equipment and process means carries out the erection, grounding and passage of power transmission line and a series of work, provides technical support for power transmission engineering technology, and pre -tension frame for power transmission line erection is a kind of equipment for power transmission line erection, main function is to provide pre -tension to power transmission line in erection process, ensure that it is in tension state in erection process, avoid its drop distance between power tower too large, to ensure the safety of power transmission line erection.In addition, the pre -tension frame can also adjust the pre -tension of the power transmission line according to the specification of the power transmission line, and the adaptability is stronger, and the use effect is better.

[0003] As disclosed in a kind of pre -tension frame for power transmission line erection of Chinese patent CN221812246U, counterclockwise rotating connecting rod drives vortex rod counterclockwise rotation, drives movable rod counterclockwise rotation by the cooperation of vortex rod and turbine, drives driving rod clockwise rotation by the cooperation of driving gear and driven gear, to make two half gears rotate in opposite directions.Initially, left half gear is engaged with toothed plate, when running, left half gear clockwise rotation drives toothed plate and moving block to move right, until left half gear flips half week and disengages from the engagement with toothed plate, while right half gear counterclockwise rotation is engaged with toothed plate, drives toothed plate moving block to move left until right half gear flips half week and disengages from the engagement with toothed plate.The cooperation of the above structure realizes the reciprocating motion of moving ring, drives power transmission line to be evenly wound on the full surface of winding roller, in addition, the pre -tension frame for power transmission line erection is started motor by external power supply, the output end of motor drives rotating rod and winding roller rotation, drives power transmission line to be wound on winding roller, so that the power transmission line on pre -tension frame gradually tends to be tight, to achieve the pre -tension effect of output line.

[0004] For this structure, although the power transmission line can be pre -tensioned and wound, the device is not convenient for cleaning dust and sundries attached to the outer wall of the power transmission line when winding, so that the power transmission line is wound together with dust and sundries, therefore we propose a kind of pre -tension frame for power transmission line erection, which can clean the surface of the power transmission line wound by pre -tension, so that the wound power transmission line is cleaner and neater, to improve the pre -tension winding effect. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of pre -tension frame for power transmission line erection to solve the problems raised in the above background.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: A pre -tightening frame for power transmission line erection, including the bottom plate, the bottom plate top surface fixed installation has the winding mechanism, the winding mechanism outer wall is wound with the power transmission line, and the processing assembly is arranged on the bottom plate, the processing assembly includes the cleaning assembly arranged on the bottom plate, the cleaning assembly is close to the winding mechanism one side and is provided with the guide assembly.

[0007] Preferably, the cleaning assembly includes a vertical plate fixedly installed on the top surface of the bottom plate, a rotating shaft is rotatably connected inside the vertical plate, a first belt pulley set is sleeved on the outer wall of the rotating shaft, a gear is fixedly installed on the end of the rotating shaft, a gear ring is engaged with the gear, a rotating drum is fixedly sleeved inside the gear ring, a ring frame is rotatably connected to the outer wall of the rotating drum, a fixed rod is fixedly installed on the inner wall of the rotating drum, a first magnetic ring is fixedly installed on the outer wall of the fixed rod, a sliding plate is slidably arranged on the outer wall of the fixed rod, a second magnetic ring is fixedly installed on the side wall of the sliding plate, and a cleaning pad is fixedly installed on the side of the sliding plate away from the second magnetic ring.

[0008] Preferably, the guide assembly includes a second belt pulley set sleeved on the outer wall of the winding mechanism, a reciprocating screw rod is fixedly sleeved inside the second belt pulley set, a sleeve block is sleeved on the outer wall of the reciprocating screw rod, a limiting rod is slidably arranged inside the sleeve block, a frame body is fixedly installed on the end of the limiting rod, a rotating column is rotatably connected to the top surface of the sleeve block, and a guide ring is fixedly installed on the end of the rotating column away from the sleeve block.

[0009] Preferably, the number of cleaning pads is four, which are divided into two groups and symmetrically distributed with the center of the rotating drum, and the power transmission line can be uniformly cleaned under the limitation of the two groups of cross-shaped cleaning pads.

[0010] Preferably, the ring frame is fixedly installed on the top surface of the bottom plate, and the rotating drum is rotatably connected to the inner wall of the ring frame, so that the gear ring can drive the rotating drum to stably rotate under the support of the ring frame, and the rotating drum drives the cleaning pad inside it to rotate and clean the outer wall of the power transmission line.

[0011] Preferably, the first belt pulley set is fixedly sleeved on the outer wall of the rotating shaft, and the second belt pulley set is fixedly sleeved on the outer wall of the reciprocating screw rod away from the rotating shaft, so that when the winding mechanism winds, the second belt pulley set is driven to rotate, the reciprocating screw rod is driven to rotate by the second belt pulley set, the rotating shaft is driven to rotate by the reciprocating screw rod through the first belt pulley set, and the gear and the gear ring are driven to rotate by the rotating shaft, so as to rotate and clean the outer wall of the power transmission line.

[0012] Preferably, the first magnetic ring and the second magnetic ring repel each other, and the end of the fixed rod and the inner wall of the rotating drum are fixedly installed, so that the second magnetic ring and the cleaning pad are pushed under the limitation of magnetic repulsion, so that the cleaning pad is in contact with the outer wall of the power transmission line.

[0013] Preferably, the frame body is fixedly installed with the top surface of the base plate, the number of the frame body is two, and the frame body is symmetrically distributed with the center line of the top surface of the base plate.

[0014] Preferably, the inner wall of the guide ring is made of flexible material, the guide ring is rotatably connected with the top surface of the sleeve block through the rotating column, and under the limitation of the rotatable guide ring, the outer skin of the power transmission line is prevented from being damaged, and under the limitation of the guide ring with the flexible material inner wall, the damage of the power transmission line caused by the winding mechanism is reduced.

[0015] Preferably, the second pulley set is fixedly sleeved with the outer wall of the winding mechanism, and the reciprocating screw rod is fixedly sleeved with the second pulley set and the first pulley set, so that when the winding mechanism winds the power transmission line, the reciprocating screw rod and the rotating rod are driven to rotate.

[0016] Compared with the prior art, the utility model has the advantages of:

[0017] 1. The pre-tightening frame for power transmission line erection is composed of a cleaning assembly, and when the power transmission line is erected, the pre-tightening treatment is required, the power transmission line is pre-tightened by the winding mechanism, the outer wall of the power transmission line is cleaned when the power transmission line is wound, the power transmission line passes through the inside of the rotating drum, and under the repulsion of the first magnetic ring and the second magnetic ring, the power transmission line is clamped by the cleaning pad. When the winding mechanism rotates to wind the power transmission line, the reciprocating screw rod is driven to rotate by the second pulley set, the rotating rod is driven to rotate by the first pulley set fixedly sleeved with the outer wall of the reciprocating screw rod, the gear fixedly installed at the end of the rotating rod is driven to rotate, the gear ring is driven to rotate by the rotating gear under the limitation that the ring frame bottom is fixedly installed with the top surface of the base plate and the gear ring inner wall is fixedly sleeved with the rotating drum outer wall, the rotating drum is driven to rotate in the ring frame by the rotating gear ring, the fixed rod fixedly installed on the inner wall of the rotating drum is driven to rotate, the sliding plate slidingly arranged on the outer wall of the fixed rod is driven to rotate with the cleaning pad, and four cleaning pads clamp and rotate to clean the outer wall of the power transmission line, so that the power transmission line wound on the outer wall of the winding mechanism is clean, the power transmission line with dust is prevented from being wound on the outer wall of the winding mechanism, and different sizes of power transmission lines can be clamped and cleaned under the repulsion of the first magnetic ring and the second magnetic ring. The structure can clean the power transmission line to be wound, so that the pre-tightening effect of the winding mechanism is improved (the winding mechanism and the pre-tightening frame are existing disclosed technologies in the comparative file, so the structure is not fully described in the case).

[0018] 2. The pre-tightening frame for power transmission line erection is composed of a guide assembly, when the power transmission line on the pre-tightening frame is pre-tightened, the power transmission line is wound and tightened by the winding mechanism, when the winding mechanism winds the power transmission line, the power transmission line needs to be guided and wound, the power transmission line passes through the inside of the guide ring, when the winding mechanism rotates and winds, the second belt pulley set drives the reciprocating screw rod to rotate, the sleeve block is slidably arranged on the outer wall of the limiting rod, under the limitation, the rotating reciprocating screw rod drives the sleeve block reciprocatingly arranged on the outer wall to reciprocate, the rotating column rotationally connected to the top surface of the sleeve block moves, the rotating column drives the guide ring to reciprocate, the guide ring drives the power transmission line passing through the inside to move, the power transmission line is guided and uniformly wound on the outer wall of the winding mechanism, under the limitation, when the power transmission line is in an inclined state, the guide ring drives the rotating column to rotate on the top surface of the sleeve block, the guide ring is adaptively adjusted according to the direction of the power transmission line, the friction between the outer wall of the power transmission line and the inner wall of the guide ring is avoided to cause the damage of the surface of the power transmission line, the structure guides and conveys the power transmission line through the simple reciprocating mechanism, meanwhile, the rotating rotating column can make the guide ring rotate and guide according to the direction of the power transmission line, the power transmission line is prevented from being scraped with the inner wall of the guide ring to cause the damage of the surface of the power transmission line. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a three-dimensional appearance view of the structure of the utility model.

[0020] Figure 2 It is a schematic view of the cleaning assembly and the guide assembly of the structure of the utility model.

[0021] Figure 3 It is a cleaning assembly view of the structure of the utility model.

[0022] Figure 4 It is an exploded schematic view of the cleaning assembly of the structure of the utility model.

[0023] Figure 5 It is a guide assembly view of the structure of the utility model.

[0024] Figure 6 It is an exploded schematic view of the guide assembly of the structure of the utility model.

[0025] In the drawing: 1, bottom plate; 2, winding mechanism; 3, power transmission line; 4, processing assembly; 41, cleaning assembly; 43, guide assembly; 411, first belt pulley set; 412, rotating rod; 413, gear; 414, gear ring; 415, rotating drum; 416, ring frame; 417, fixed rod; 418, first magnetic ring; 419, sliding plate; 420, second magnetic ring; 421, cleaning pad; 422, vertical plate; 431, second belt pulley set; 432, reciprocating screw rod; 433, sleeve block; 434, limiting rod; 435, frame body; 436, rotating column; 437, guide ring. DETAILED DESCRIPTION

[0026] In order to have a clearer understanding of the technical features, objects and effects of the utility model, the specific implementation mode of the utility model will be explained by referring to the drawings.

[0027] Embodiment 1: the preferred embodiment of the pre-tightening frame for power transmission line erection provided by the utility model is as shown in the figure: Figures 1 to 6 The pre-tightening frame for power transmission line erection comprises a bottom plate 1;

[0028] The top surface of the bottom plate 1 is fixedly installed with a winding mechanism 2;

[0029] The outer wall of the winding mechanism 2 is wound with a power transmission line 3;

[0030] and a processing assembly 4 arranged above the bottom plate 1, the processing assembly 4 comprises a cleaning assembly 41 arranged above the bottom plate 1, the cleaning assembly 41 comprises a vertical plate 422 fixedly installed on the top surface of the bottom plate 1, a rotating shaft 412 is rotatably connected inside the vertical plate 422, a first belt pulley set 411 is sleeved on the outer wall of the rotating shaft 412, a gear 413 is fixedly installed on the end of the rotating shaft 412, a gear ring 414 is engaged with the gear 413, a rotating drum 415 is fixedly sleeved inside the gear ring 414, a ring frame 416 is rotatably connected on the outer wall of the rotating drum 415, a fixed rod 417 is fixedly installed on the inner wall of the rotating drum 415, a first magnetic ring 418 is fixedly installed on the outer wall of the fixed rod 417, a sliding plate 419 is slidably arranged on the outer wall of the fixed rod 417, a second magnetic ring 420 is fixedly installed on the side wall of the sliding plate 419, and a cleaning pad 421 is fixedly installed on the side of the sliding plate 419 away from the second magnetic ring 420.

[0031] In this embodiment, when the power transmission line 3 is erected, it needs to be pre-tightened. The power transmission line 3 is pre-tightened by the winding mechanism 2. When the power transmission line 3 is wound, its outer wall needs to be clean. The power transmission line 3 passes through the inside of the rotating drum 415. The first magnetic ring 418 and the second magnetic ring 420 repel each other magnetically. The outer wall of the power transmission line 3 is clamped by the cleaning pad 421. When the winding mechanism 2 rotates to wind the power transmission line 3, it drives the reciprocating screw rod 432 to rotate through the second belt pulley set 431. The first belt pulley set 411 fixedly sheathed on the outer wall of the reciprocating screw rod 432 drives the rotating rod 412 to rotate. The gear 413 fixedly installed at the end of the rotating rod 412 rotates. Since the bottom of the ring frame 416 is fixedly installed on the top surface of the bottom plate 1, and the inner wall of the gear ring 414 is fixedly sheathed on the outer wall of the rotating drum 415, the rotating gear 413 drives the gear ring 414 to rotate under its restriction, so that the gear ring 414 drives the rotating drum 415 to rotate inside the ring frame 416. The rotating drum 415 drives the fixed rod 417 fixedly installed on its inner wall to rotate. The fixed rod 417 drives the sliding plate 419 and the cleaning pad 421 to rotate, which are slidingly arranged on the outer wall of the fixed rod 417. The four cleaning pads 421 clamp and rotate to clean the outer wall of the power transmission line 3, so that the power transmission line 3 wound on the outer wall of the winding mechanism 2 is clean, avoiding the power transmission line 3 with dust wound on the outer wall of the winding mechanism 2. Under the magnetic repulsion of the first magnetic ring 418 and the second magnetic ring 420, different sizes of power transmission lines 3 can be clamped and cleaned. This structure can clean the power transmission line 3 to be wound, so as to improve the pre-tightening effect of the winding mechanism 2 (the winding mechanism 2 and the pre-tightening frame are existing disclosed technologies in the comparative file, so the structure is not fully described in this case).

[0032] Among them, the number of cleaning pads 421 is four, which are divided into two groups and distributed symmetrically with the center of the rotating drum 415. Under the restriction of the two groups of cross-shaped cleaning pads 421, the outer wall of the power transmission line 3 can be uniformly cleaned.

[0033] Among them, the ring frame 416 is fixedly installed on the top surface of the bottom plate 1, and the outer wall of the rotating drum 415 is rotatably connected with the inside of the ring frame 416. Under the support of the ring frame 416, the gear ring 414 can drive the rotating drum 415 to stably rotate, so that the rotating drum 415 drives the cleaning pad 421 inside it to rotate and clean the outer wall of the power transmission line 3.

[0034] Among them, the first belt pulley set 411 is fixedly sheathed in the inside of the rotating rod 412, and the first belt pulley set 411 is fixedly sheathed on the outer wall of the reciprocating screw rod 432 away from the rotating rod 412. When the winding mechanism 2 winds, it drives the second belt pulley set 431 to rotate, so that the second belt pulley set 431 drives the reciprocating screw rod 432 to rotate. The reciprocating screw rod 432 drives the rotating rod 412 to rotate through the first belt pulley set 411, and drives the gear 413 and the gear ring 414 to rotate through the rotating rod 412, so as to rotate and clean the outer wall of the power transmission line 3.

[0035] The first magnetic ring 418 and the second magnetic ring 420 repel each other magnetically, the end of the fixed rod 417 is fixedly installed on the inner wall of the rotating drum 415, and the second magnetic ring 420 and the cleaning pad 421 are pushed under the magnetic repulsion limitation, so that the cleaning pad 421 is in contact with and clamped on the outer wall of the power transmission line 3.

[0036] Embodiment 2: On the basis of embodiment 1, the preferred embodiment of the pre-tightening frame for power transmission line erection provided by the utility model is as shown in the figure: Figures 1 to 6 As shown: the guide assembly 43 includes a second pulley set 431 sleeved on the outer wall of the winding mechanism 2, a reciprocating screw rod 432 fixedly sleeved inside the second pulley set 431, a sleeve block 433 sleeved on the outer wall of the reciprocating screw rod 432, a limiting rod 434 slidingly arranged inside the sleeve block 433, a frame body 435 fixedly installed on the end of the limiting rod 434, a rotating column 436 rotationally connected to the top surface of the sleeve block 433, and a guide ring 437 fixedly installed on the end of the rotating column 436 away from the sleeve block 433.

[0037] In this embodiment, when the power transmission line 3 on the pre-tightening frame is pre-tightened, the power transmission line 3 is wound and tightened by the winding mechanism 2, and in order to make the power transmission line 3 uniformly wound on the outer wall of the winding mechanism 2, the power transmission line 3 needs to be guided to be wound, and the power transmission line 3 is passed through the inside of the guide ring 437, and when the winding mechanism 2 rotates to be wound, the second pulley set 431 drives the reciprocating screw rod 432 to rotate, and since the sleeve block 433 and the limiting rod 434 are slidingly arranged on the outer wall of the sleeve block 433, under the limitation, the rotating reciprocating screw rod 432 drives the sleeve block 433 sleeved on the outer wall of the reciprocating screw rod 432 to reciprocate, and the rotating column 436 rotationally connected to the top surface of the sleeve block 433 moves, and the rotating column 436 drives the guide ring 437 to reciprocate, and the guide ring 437 drives the power transmission line 3 passing through the inside of the guide ring 437 to move, so as to guide and uniformly wind the power transmission line 3 on the outer wall of the winding mechanism 2, and since the rotating column 436 is rotationally connected to the top surface of the sleeve block 433, under the limitation, when the power transmission line 3 is in an inclined state, the guide ring 437 drives the rotating column 436 to rotate on the top surface of the sleeve block 433, so that the guide ring 437 is adaptively adjusted according to the direction of the power transmission line 3, and the friction between the outer wall of the power transmission line 3 and the inner wall of the guide ring 437 is avoided to cause the surface of the power transmission line 3 to be damaged. The structure guides and conveys the power transmission line 3 through a simple reciprocating mechanism, and the rotating rotating column 436 can make the guide ring 437 rotate and guide according to the direction of the power transmission line 3, so as to avoid the power transmission line 3 being scraped by the inner wall of the guide ring 437 and causing the surface of the power transmission line 3 to be damaged.

[0038] The frame body 435 is fixedly installed on the top surface of the bottom plate 1, and the number of the frame body 435 is two, which are symmetrically distributed on the center line of the top surface of the bottom plate 1, so that the guide ring 437 can stably guide the power transmission line 3 under the support of the frame body 435.

[0039] The inner wall of the guide ring 437 is made of flexible material, the guide ring 437 is rotationally connected with the top surface of the sleeve block 433 through the rotating column 436, under the restriction of the rotatable guide ring 437, the outer skin of the power transmission line 3 is prevented from being damaged, and under the restriction of the flexible material inner wall of the guide ring 437, the damage of the power transmission line 3 caused by the winding mechanism 2 can be reduced.

[0040] The second pulley set 431 is fixedly sleeved with the outer wall of the winding mechanism 2, the reciprocating screw rod 432 is fixedly sleeved with the inner part of the second pulley set 431 and the first pulley set 411, and when the winding mechanism 2 winds the power transmission line 3, the reciprocating screw rod 432 and the rotating rod 412 are driven to rotate by the inner rotating shaft.

[0041] The above is only a specific embodiment of the utility model, and is not used to limit the range of the utility model. Any person skilled in the art can make equivalent changes and modifications without departing from the concept and principle of the utility model, and the changes and modifications shall belong to the protection range of the utility model. It should be noted that the components of the utility model are not limited to the above overall application, and each technical feature described in the specification of the utility model can be selected and used alone or combined with multiple items according to actual needs, therefore, the utility model naturally covers other combinations and specific applications related to the utility model.

Claims

1. A pre-tightening frame for power transmission line erection, comprising a base plate (1); A winding mechanism (2) is fixedly installed on the top surface of the base plate (1); The outer wall of the winding mechanism (2) is wound with a power transmission line (3); and a machining assembly (4) arranged above the base plate (1), characterized in that The processing assembly (4) comprises a cleaning assembly (41) arranged above the base plate (1), and a guide assembly (43) is arranged on the side close to the winding mechanism (2) of the cleaning assembly (41).

2. A pre-tensioned tower according to claim 1, characterized in that: The cleaning assembly (41) comprises a vertical plate (422) fixedly installed on the top surface of the base plate (1), a rotating shaft (412) rotatably connected inside the vertical plate (422), a first pulley set (411) sleeved on the outer wall of the rotating shaft (412), a gear (413) fixedly installed on the end of the rotating shaft (412), a gear ring (414) engaged with the gear (413), a rotating drum (415) fixedly sleeved inside the gear ring (414), a ring frame (416) rotatably connected on the outer wall of the rotating drum (415), a fixed rod (417) fixedly installed on the inner wall of the rotating drum (415), a first magnetic ring (418) fixedly installed on the outer wall of the fixed rod (417), a sliding plate (419) slidably arranged on the outer wall of the fixed rod (417), a second magnetic ring (420) fixedly installed on the side wall of the sliding plate (419), and a cleaning pad (421) fixedly installed on the side away from the second magnetic ring (420) of the sliding plate (419).

3. A pre-tensioned tower according to claim 1, characterized in that: The guide assembly (43) comprises a second pulley set (431) sleeved on the outer wall of the winding mechanism (2), a reciprocating screw rod (432) fixedly sleeved inside the second pulley set (431), a sleeve block (433) sleeved on the outer wall of the reciprocating screw rod (432), a limiting rod (434) slidably arranged inside the sleeve block (433), a frame body (435) fixedly installed on the end of the limiting rod (434), a rotating column (436) rotatably connected on the top surface of the sleeve block (433), and a guide ring (437) fixedly installed on the end away from the sleeve block (433) of the rotating column (436).

4. A pre-tensioned tower according to claim 2, characterized in that: The number of the cleaning pads (421) is four, which are divided into two groups and distributed in a central symmetry with the rotating drum (415).

5. A pre-tensioned tower according to claim 2, characterized in that: The ring frame (416) is fixedly installed on the top surface of the base plate (1), and the rotating drum (415) is rotatably connected with the inner wall of the ring frame (416).

6. A pre-tensioned tower according to claim 2, characterized in that: The first pulley set (411) is fixedly sleeved with the outer wall of the rotating shaft (412) inside, and the first pulley set (411) is fixedly sleeved with the outer wall of the reciprocating screw rod (432) inside away from the rotating shaft (412).

7. A pre-tensioned tower according to claim 2, characterized in that: The first magnetic ring (418) and the second magnetic ring (420) repel each other magnetically, and the end of the fixed rod (417) is fixedly installed with the inner wall of the rotating drum (415).

8. A pre-tensioned tower according to claim 3, characterized in that: The frame body (435) is fixedly installed on the top surface of the base plate (1), and the number of the frame body (435) is two, which are distributed in a central symmetry with the top surface center line of the base plate (1).

9. A pre-tensioned tower according to claim 3, characterized in that: The inner wall of the guide ring (437) is made of flexible material, and the guide ring (437) is rotatably connected with the top surface of the sleeve block (433) through the rotating column (436).

10. A pre-tensioned tower according to claim 3, characterized in that: The second pulley group (431) is fixedly sleeved inside the outer wall of the winding mechanism (2), and the reciprocating wire rod (432) is fixedly sleeved inside the second pulley group (431) and the first pulley group (411).

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