A cargo handling conveyor

Abstract

The present invention belongs to the technical field of cargo loading and unloading transportation, and discloses a cargo loading and unloading conveyor, including a first base, a rotating seat is movably sleeved on one side of the upper surface of the first base, a first connecting rod is movably sleeved in the middle of the protrusions on both sides of the rotating seat, a conveying frame is fixedly connected to the outer cylindrical surface of the first connecting rod, a conveying belt is movably sleeved on the outer edge of the conveying frame, four shock-absorbing columns are evenly distributed and movably sleeved in the middle of the lower surface of the first base, and four shock-absorbing springs are fixedly connected to the lower surface of the first base. The present invention realizes the adjustment of bumps and severe vibrations during the conveying process of the conveyor through the design of the shock-absorbing mechanism, effectively absorbs and reduces the vibration and impact from the transportation process, reduces the wear and damage of the goods, and can also protect the cargo conveyor itself and related mechanical equipment, and reduce the repair and maintenance costs of the equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of cargo loading and unloading transportation, and specifically relates to a cargo loading and unloading conveyor. Background Art

[0002] Cargo handling conveyors, also known as conveyors, logistics conveying equipment, etc., are mechanical equipment used for loading, unloading, transporting and sorting goods in the production and logistics process. Early conveyors were composed of belts, wheels and manually pushed rollers, and were used to transfer goods from one point to another within the factory. With the development of technology, different types of conveying equipment such as electric conveyors, roller conveyors, and chain conveyors have been developed to improve transportation efficiency and automation. Therefore, in addition to traditional conveying functions, modern cargo handling conveyors have also incorporated advanced technologies such as automation, becoming an indispensable part of modern logistics warehousing systems.

[0003] However, the existing cargo loading and unloading conveyors still have the following deficiencies in their actual working process: most of the existing loading and unloading conveyors cannot realize sorting and transporting at the same time, and require the intervention of other conditions, which is time-consuming and labor-intensive, and cannot accurately realize the classified transportation of small goods; in addition, there will be many fragile goods during cargo transportation, and the protection of the goods during transportation is also very important. The existing equipment cannot be adjusted immediately during long-distance transportation, which affects the quality of cargo transportation. Long-term bumps and vibrations will also increase the failure rate of the equipment itself. Summary of the invention

[0004] The object of the present invention is to provide a cargo handling conveyor to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical scheme: a cargo loading and unloading conveyor, comprising a first base, a rotating seat movably sleeved on one side of the upper surface of the first base, a first connecting rod movably sleeved on the middle of the protrusions on both sides of the rotating seat, a conveying frame fixedly connected to the outer cylindrical surface of the first connecting rod, a conveying belt movably sleeved on the outer edge of the conveying frame, four shock-absorbing columns evenly distributed movably sleeved on the middle of the lower surface of the first base, four shock-absorbing springs fixedly connected to the lower surface of the first base, four groups of shock-absorbing springs movably sleeved on the outer cylindrical surfaces of the shock-absorbing columns, a shock-absorbing mechanism fixedly connected to the lower surface of the first base, one end of the shock-absorbing spring is fixedly connected to the second base, two crawler chains movably sleeved on both sides of the second base, A driving rod is movably sleeved on one side, and one end of the driving rod is fixedly connected to the first gear on the outer circular surface of the driving rod, and a connecting column located on one side of the first gear is fixedly connected to the middle part of one end of the outer circular surface of the driving rod, and both ends of the connecting column are fixedly connected to an annular rack. A rotating rod located on one side of the driving rod is movably sleeved on the middle part of one end of the conveying frame, and one end of the rotating rod is fixedly connected to the second gear, and the other end of the rotating rod is fixedly connected to the first roller, and a rotating rod is movably sleeved on the other side of the conveying frame, and one end of the rotating rod is fixedly connected to the second roller, and a belt is movably sleeved on the outer circular surface of the first roller, and the other end of the belt is movably sleeved on the outer edge of the second roller, and one end of the outer circular surface of the rotating rod is fixedly connected to an L-shaped connecting rod, and one end of the L-shaped connecting rod is movably sleeved on a movable plate.

[0006] Preferably, the shock absorbing mechanism includes an upper base, which is fixedly connected to the first base, and two second connecting rods are movably sleeved on the inner sides of the protrusions on both sides of the upper base, and a first shock absorbing block is fixedly connected to the lower surface of the upper base, and a hydraulic shock absorber is movably sleeved on the outer edge of the first shock absorbing block, and two fixed frames are fixedly connected on both sides of the hydraulic shock absorber, and two moving blocks are movably sleeved on the inner sides of two groups of the fixed frames, and a third connecting rod is movably sleeved in the middle parts of the two groups of the moving blocks, and a second shock absorbing block is movably sleeved in the middle part of the lower surface of the hydraulic shock absorber, and the lower surface of the second shock absorbing block is fixedly connected to the lower base, and two fourth connecting rods are movably sleeved on the inner sides of the protrusions on both sides of the lower base.

[0007] Preferably, the outer circular surfaces of the two groups of the third connecting rods are movably sleeved with four first linkage rods and a second linkage rod, the four groups of the first linkage rods are fixedly connected to the outer circular surfaces of the second connecting rods, and the four groups of the second linkage rods are fixedly connected to the outer circular surfaces of the fourth connecting rods.

[0008] Preferably, a third linkage rod is fixedly connected to one side of the upper base, four fixed rope frames symmetrically distributed along the third linkage rod are fixedly connected to one side of the upper surface of the first base, four fixed rope blocks evenly distributed are fixedly connected to one side of the first base, a rotating rope rod is movably sleeved on the inner middle part of the four groups of fixed rope frames, one end of the rotating rope rod is fixedly connected to a rotating column, one end of the rotating column is provided with a plurality of evenly distributed gear grooves, one side of the fixed rope frame is fixedly connected to a spring base, one of the spring bases is fixedly connected to a spring, one end of the spring is fixedly connected to a block, and one end of the rotating column close to the third linkage rod is fixedly connected to the third gear.

[0009] Preferably, a telescopic column is movably sleeved in the middle of one side of the third linkage rod, the telescopic column is a right-angled trapezoidal structure, and the outer edge structure of the third gear is adapted to the right-angled trapezoidal structure of the telescopic column.

[0010] Preferably, the second gear is a convex gear, the tooth surface of the second gear meshes with the tooth surface of the first gear, a plurality of evenly distributed tooth blocks are fixedly connected to the inner side of the annular rack, and the inner tooth surface of the annular rack meshes with the tooth surface of the second gear.

[0011] Preferably, the internal medium of the hydraulic shock absorber is hydraulic oil.

[0012] Preferably, rope holes are provided in the middle of the fixed rope frame and the rotating rope rod, a synchronous belt is movably sleeved on the outer edge of the movable plate, and a motor is fixedly connected to the inner bottom surface of the movable plate.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. The present invention adjusts the rotating seat and the conveying frame to the required loading and unloading angle through the design of the moving block, drives the conveying belt to rotate, and the conveying belt drives the driving rod to rotate, and the driving rod drives the first gear and the circular rack to rotate. Because the second gear is a convex gear structure, the first gear and the circular rack drive the second gear to do forward and reverse motion, the second gear drives the first roller to do forward and reverse motion through the rotating rod, the first roller drives the second roller to do forward and reverse motion through the belt, and the second roller drives the moving plate to do back and forth reciprocating motion through the connecting column and the L-shaped connecting rod, thereby realizing the sorting and conveying of goods at the same time, greatly improving the efficiency of loading and unloading, and reducing the limitations of the equipment.

[0015] 2. Through the design of the shock absorbing mechanism, when encountering a bumpy road section, the track chain acts on the second base, the second base is subjected to the force of the bump, the lower base drives the moving block to reciprocate through the fourth connecting rod and the second connecting rod, the moving block drives the upper base to move through the first connecting rod and the second connecting rod, the upper base and the lower base drive the first shock absorbing block and the second shock absorbing block to move, the first shock absorbing block and the second shock absorbing block apply the force of the bump to the hydraulic shock absorber, thereby realizing the regulation of the bump and severe vibration during the conveying process of the conveyor, effectively absorbing and reducing the vibration and impact from the transportation process, reducing the wear and damage of the goods, and also protecting the cargo conveyor itself and related mechanical equipment, reducing the repair and maintenance costs of the equipment.

[0016] 3. Through the design of the rope rotating rod, the rope for fixing the cargo is fixed in the fixed rope frame and the rope rotating rod through the rope hole of the present invention, the upper base drives the third linkage rod to move, the third linkage rod drives the third gear to rotate intermittently, and the third gear drives the rope rotating rod to rotate through the rotating column. Since the bottom of the fixed rope frame fixes the rope, the rope is wound on the rope rotating rod at this time, which realizes the tightening of the rope for fixing the cargo on bumpy roads, can effectively prevent the cargo from falling off, and ensure the safe transportation of the cargo. At the same time, the fixed rope tightens the cargo, which can reduce collision and friction between the cargo and reduce the risk of cargo damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a partial structural schematic diagram of the present invention;

[0019] Figure 3 It is a schematic diagram of the overall structure of the shock absorbing mechanism of the present invention;

[0020] Figure 4 It is a front view of the shock absorbing mechanism of the present invention;

[0021] Figure 5 For the present invention Figure 1 The enlarged schematic diagram at A in the middle;

[0022] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of point B in the middle.

[0023] In the figure: 1, the first base; 2, the rotating base; 3, the conveying frame; 4, the conveying belt; 5, the second base; 6, the driving rod; 7, the first gear; 8, the ring rack; 9, the rotating rod; 10, the second gear; 11, the first roller; 12, the second roller; 13, the belt; 14, the moving plate; 15, the upper base; 16, the first shock-absorbing block; 17, the hydraulic shock absorber; 18, the fixed frame; 19, the moving block; 20, the second shock-absorbing block; 21, the lower base; 22, the first linkage rod; 23, the second linkage rod; 24, the third linkage rod; 25, the fixed rope frame; 26, the rotating rope rod; 27, the third gear; 28, the telescopic column; 29, the shock-absorbing column; 30, the shock-absorbing spring; 31, the rotating rod; 32, the crawler chain; 33, the spring base; 34, the spring; 35, the block. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of 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.

[0025] like Figures 1 to 6As shown, an embodiment of the present invention provides a cargo loading and unloading conveyor, comprising a first base 1, a rotating base 2 is movably sleeved on one side of the upper surface of the first base 1, a first connecting rod is movably sleeved on the middle of the protrusions on both sides of the rotating base 2, a conveying frame 3 is fixedly connected to the outer cylindrical surface of the first connecting rod, a conveying belt 4 is movably sleeved on the outer edge of the conveying frame 3, four shock-absorbing columns 29 evenly distributed are movably sleeved on the middle of the lower surface of the first base 1, four shock-absorbing springs 30 are fixedly connected to the lower surface of the first base 1, four groups of shock-absorbing springs 30 are movably sleeved on the outer cylindrical surfaces of the shock-absorbing columns 29, a shock-absorbing mechanism fixedly connected to the lower surface of the first base 1 is provided, one end of the shock-absorbing spring 30 is fixedly connected to the second base 5, two crawler chains 32 are movably sleeved on both sides of the second base 5, a driving rod 6 is movably sleeved on one side of the conveying frame 3, one end of the outer cylindrical surface of the driving rod 6 is fixedly connected to the first gear 7, the middle of one end of the outer cylindrical surface of the driving rod 6 is fixedly connected to a connecting column located on one side of the first gear 7, and both ends of the connecting column are fixedly connected to circular rings The middle part of one end of the conveying frame 3 is movably sleeved with a rotating rod 9 located on one side of the driving rod 6, one end of the rotating rod 9 is fixedly connected with a second gear 10, the second gear 10 is a convex gear, the tooth surface of the second gear 10 is meshed with the tooth surface of the first gear 7, the inner side of the annular rack 8 is fixedly connected with a plurality of evenly distributed tooth blocks, the inner tooth surface of the annular rack 8 is meshed with the tooth surface of the second gear 10, the other end of the rotating rod 9 is fixedly connected with a first roller 11, and the other side of the conveying frame 3 is movably sleeved with a rotating Rod 31, one end of the rotating rod 31 is fixedly connected to the second roller 12, the outer cylindrical surface of the first roller 11 is movably sleeved with a belt 13, the other end of the belt 13 is movably sleeved with the outer edge of the second roller 12, one end of the outer cylindrical surface of the rotating rod 31 is fixedly connected to an L-shaped connecting rod, one end of the L-shaped connecting rod is movably sleeved with a moving plate 14, the middle parts of the fixed rope frame 25 and the rotating rope rod 26 are both provided with rope holes, the outer edge of the moving plate 14 is movably sleeved with a synchronous belt, and the inner bottom surface of the moving plate 14 is fixedly connected to a motor.

[0026] The shock absorbing mechanism includes an upper base 15, which is fixedly connected to the first base 1, and two second connecting rods are movably sleeved on the inner side of the protrusions on both sides of the upper base 15, and a first shock absorbing block 16 is fixedly connected to the lower surface of the upper base 15, and a hydraulic shock absorber 17 is movably sleeved on the outer edge of the first shock absorbing block 16, and two fixed frames 18 are fixedly connected on both sides of the hydraulic shock absorber 17, and two moving blocks 19 are movably sleeved on the inner sides of the two groups of fixed frames 18, and a third connecting rod is movably sleeved in the middle of the two groups of moving blocks 19, and a second shock absorbing block 20 is movably sleeved in the middle of the lower surface of the hydraulic shock absorber 17, and a lower base 21 is fixedly connected to the lower surface of the second shock absorbing block 20, and two fourth connecting rods are movably sleeved on the inner side of the protrusions on both sides of the lower base 21, and the outer circumferential surfaces of the two groups of third connecting rods are movably sleeved. There are four first linkage rods 22 and second linkage rods 23, four groups of first linkage rods 22 are fixedly connected to the outer cylindrical surface of the second connecting rod, and four groups of second linkage rods 23 are fixedly connected to the outer cylindrical surface of the fourth connecting rod. When encountering a bumpy road section, the track chain 32 acts on the second base 5, and the second base 5 is subjected to the force of the bump. The lower base 21 drives the moving block 19 to reciprocate through the fourth connecting rod and the second linkage rod 23. The moving block 19 drives the upper base 15 to move through the first linkage rod 22 and the second connecting rod. The upper base 15 and the lower base 21 drive the first shock-absorbing block 16 and the second shock-absorbing block 20 to move. The first shock-absorbing block 16 and the second shock-absorbing block 20 apply the force of the bump to the hydraulic shock absorber 17, thereby realizing the shock absorption of the entire transport machine and greatly reducing the damage to fragile goods during transportation.

[0027] Among them, a third linkage rod 24 is fixedly connected to one side of the upper base 15, four fixed rope frames 25 symmetrically distributed along the third linkage rod 24 are fixedly connected to one side of the upper surface of the first base 1, and four fixed rope blocks evenly distributed are fixedly connected to one side of the first base 1. A rotating rope rod 26 is movably sleeved on the inner middle part of the four groups of fixed rope frames 25, and a rotating column is fixedly connected to one end of the rotating rope rod 26. A plurality of evenly distributed gear grooves are opened at one end of the rotating column. A spring base 33 is fixedly connected to one side of the spring base 33. A spring 34 is fixedly connected to one end of the spring 34. A block 35 is fixedly connected to one end of the spring 34. A third gear 2 is fixedly connected to one end of the rotating column close to the third linkage rod 24. 7. A telescopic column 28 is movably sleeved in the middle of one side of the third linkage rod 24. The telescopic column 28 is a right-angled trapezoidal structure. The outer edge structure of the third gear 27 is adapted to the right-angled trapezoidal structure of the telescopic column 28. The rope for fixing the goods is fixed in the fixed rope frame 25 and the rope rotating rod 26 through the rope hole. The upper base 15 drives the third linkage rod 24 to move, and the third linkage rod 24 drives the third gear 27 to rotate intermittently. The third gear 27 drives the rope rotating rod 26 to rotate through the rotating column. Due to the fixation of the rope at the bottom of the fixed rope frame 25, the rope is wound on the rope rotating rod 26 at this time, realizing the contraction of the rope, so that when encountering severe bumps, the rope will be shortened by one point, realizing the guarantee of the safety and quality of cargo transportation.

[0028] Among them, the internal medium of the hydraulic shock absorber 17 is hydraulic oil, which is an incompressible fluid. This means that when subjected to impact or vibration, the oil can quickly convert into pressure and absorb energy, thereby reducing the impact force. The oil can form a uniform force surface when subjected to force, and quickly return to its original state after the force ends, thereby providing a stable shock absorption effect.

[0029] Working principle:

[0030] When the equipment is loading and unloading goods normally, the rotating seat 2 and the conveying frame 3 are adjusted to the required loading and unloading angles, and the conveying belt 4 is driven to rotate. The conveying belt 4 drives the driving rod 6 to rotate, and the driving rod 6 drives the first gear 7 and the annular rack 8 to rotate. Since the second gear 10 is a convex gear structure, the first gear 7 and the annular rack 8 drive the second gear 10 to do forward and reverse motion. The second gear 10 drives the first roller 11 to do forward and reverse motion through the rotating rod 9. The first roller 11 drives the second roller 12 to do forward and reverse motion through the belt 13. The second roller 12 drives the moving plate 14 to do reciprocating motion back and forth through the connecting column and the L-shaped connecting rod, thereby realizing the automatic loading and sorting of small goods.

[0031] In addition, when it is necessary to transport some fragile goods and encounter bumpy roads, the track chain 32 acts on the second base 5, and the second base 5 is subjected to the force of the bumps. The lower base 21 drives the moving block 19 to reciprocate through the fourth connecting rod and the second connecting rod 23. The moving block 19 drives the upper base 15 to move through the first connecting rod 22 and the second connecting rod. The upper base 15 and the lower base 21 drive the first shock-absorbing block 16 and the second shock-absorbing block 20 to move. The first shock-absorbing block 16 and the second shock-absorbing block 20 apply the force of the bumps to the hydraulic shock absorber 17, thereby achieving shock absorption of the entire transport aircraft and greatly reducing the damage to fragile goods during transportation.

[0032] Finally, when encountering a bumpy road section, the rope that fixes the cargo is fixed in the fixed rope frame 25 and the rope rotating rod 26 through the rope hole, the upper base 15 drives the third linkage rod 24 to move, the third linkage rod 24 drives the third gear 27 to rotate intermittently, and the third gear 27 drives the rope rotating rod 26 to rotate through the rotating column. Due to the fixation of the rope at the bottom of the fixed rope frame 25, the rope is wound around the rope rotating rod 26 at this time, realizing the contraction of the rope, so that when encountering severe bumps, the rope will be shortened a bit, realizing the guarantee of the safety and quality of cargo transportation.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cargo loading and unloading conveyor, comprising a first base (1), a rotating base (2) being movably sleeved on one side of the upper surface of the first base (1), a first connecting rod being movably sleeved in the middle of the protrusions on both sides of the rotating base (2), a conveying frame (3) being fixedly connected to the outer circumference of the first connecting rod, a conveying belt (4) being movably sleeved on the outer edge of the conveying frame (3), characterized in that: Four shock-absorbing columns (29) are evenly distributed and movably sleeved in the middle of the lower surface of the first base (1); four shock-absorbing springs (30) are fixedly connected to the lower surface of the first base (1); the four shock-absorbing springs (30) are movably sleeved with the outer cylindrical surfaces of the shock-absorbing columns (29); a shock-absorbing mechanism is provided on the lower surface of the first base (1) and is fixedly connected to the second base (5); two crawler chains (32) are movably sleeved on both sides of the second base (5); a driving rod (6) is movably sleeved on one side of the conveying frame (3); one end of the outer cylindrical surface of the driving rod (6) is fixedly connected to the first gear (7); the middle part of one end of the outer cylindrical surface of the driving rod (6) is fixedly connected to a connecting column located on one side of the first gear (7); The two ends of the connecting column are fixedly connected with an annular rack (8); a rotating rod (9) located on one side of the driving rod (6) is movably sleeved in the middle of one end of the conveying frame (3); a second gear (10) is fixedly connected to one end of the rotating rod (9); a first roller (11) is fixedly connected to the other end of the rotating rod (9); a rotating rod (31) is movably sleeved on the other side of the conveying frame (3); one end of the rotating rod (31) is fixedly connected with the second roller (12); a belt (13) is movably sleeved on the outer circumference of the first roller (11); the other end of the belt (13) is movably sleeved on the outer edge of the second roller (12); an L-shaped connecting rod is fixedly connected to one end of the outer circumference of the rotating rod (31); a moving plate (14) is movably sleeved on one end of the L-shaped connecting rod; The shock absorbing mechanism comprises an upper base (15), the upper base (15) being fixedly connected to the first base (1), two second connecting rods being movably sleeved on the inner sides of protrusions on both sides of the upper base (15), a first shock absorbing block (16) being fixedly connected to the lower surface of the upper base (15), a hydraulic shock absorber (17) being movably sleeved on the outer edge of the first shock absorbing block (16), two fixed frames (18) being fixedly connected to the two sides of the hydraulic shock absorber (17), two moving blocks (19) being movably sleeved on the inner sides of the two fixed frames (18), a third connecting rod being movably sleeved on the middle parts of the two moving blocks (19), a second shock absorbing block (20) being movably sleeved on the middle part of the lower surface of the hydraulic shock absorber (17), the lower surface of the second shock absorbing block (20) being fixedly connected to the lower base (21), and two fourth connecting rods being movably sleeved on the inner sides of protrusions on both sides of the lower base (21); Four first linkage rods (22) and a second linkage rod (23) are movably sleeved on the outer circumferential surfaces of the two third connection rods, the four first linkage rods (22) are fixedly connected to the outer circumferential surfaces of the second connection rods, and the four second linkage rods (23) are fixedly connected to the outer circumferential surfaces of the fourth connection rods; One side of the upper base (15) is fixedly connected to a third linkage rod (24); one side of the upper surface of the first base (1) is fixedly connected to four fixed rope frames (25) symmetrically distributed along the third linkage rod (24); one side of the first base (1) is fixedly connected to four evenly distributed fixed rope blocks; a rotating rope rod (26) is movably sleeved on the inner middle part of the four fixed rope frames (25); one end of the rotating rope rod (26) is fixedly connected to a rotating column; one end of the rotating column is provided with a plurality of evenly distributed gear grooves; one side of the fixed rope frame (25) is fixedly connected to a spring base (33); one of the spring bases (33) is fixedly connected to a spring (34); one end of the spring (34) is fixedly connected to a clamping block (35); one end of the rotating column close to the third linkage rod (24) is fixedly connected to a third gear (27); A telescopic column (28) is movably sleeved in the middle of one side of the third linkage rod (24); the telescopic column (28) is of a right-angled trapezoidal structure; and the outer edge structure of the third gear (27) is adapted to the right-angled trapezoidal structure of the telescopic column (28); The second gear (10) is a convex gear, the tooth surface of the second gear (10) meshes with the tooth surface of the first gear (7), a plurality of evenly distributed tooth blocks are fixedly connected to the inner side of the annular rack (8), and the inner tooth surface of the annular rack (8) meshes with the tooth surface of the second gear (10).

2. A cargo handling conveyor according to claim 1, characterized in that: The internal medium of the hydraulic shock absorber (17) is hydraulic oil.

3. A cargo handling conveyor according to claim 2, characterized in that: Rope holes are provided in the middle of the fixed rope frame (25) and the rotating rope rod (26); a synchronous belt is movably sleeved on the outer edge of the movable plate (14); and a motor is fixedly connected to the inner bottom surface of the movable plate (14).

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