A trolley traction system and a ship unloader

Abstract

The present invention relates to the technical field of port equipment, and particularly relates to a trolley traction system and a ship unloader. The trolley traction system includes: a pulley assembly; a traction rope that bypasses the pulley assembly and is connected to both sides of the running trolley along the running direction, and is adapted to provide traction force to the running trolley; a driving device, including a driving part and a rotating part, the driving part drives the rotating part to rotate, the traction rope is wound on the rotating part, the traction rope has a tensioned state that presses the rotating part and a relaxed state that releases the rotating part, and the rotating part is adapted to drive the traction rope to move when the traction rope is in the tensioned state; a tensioning device that abuts against the traction rope, and the tensioning device is adapted to adjust the switching of the traction rope between the tensioned state and the relaxed state. The trolley traction system provided by the present invention can realize the presence or absence of the traction force on the traction rope only by adjusting the tightness state of the traction rope through the tensioning device, without frequently starting and stopping the driving device, which is beneficial to extending the service life of the driving device, saving costs, and having good stability.

Description

Technical Field

[0001] The present invention relates to the technical field of port equipment, and particularly relates to a trolley traction system and a ship unloader. Background Art

[0002] A ship unloader is an execution device for loading and unloading bulk materials. The chain bucket ship unloader solves the problems of material spillage and dust generation during the use of traditional grab ship unloaders, and has outstanding environmental protection advantages, so it is widely used in port bulk cargo ship unloading terminals. The material taking device of the chain bucket ship unloader is installed on a trolley that can move along the girder of the ship unloader. The traction system pulls the trolley to run along the track on the girder, thereby driving the material taking device to move along the girder, so that the material taking device can perform material taking operations on materials at different positions in the cabin. Most of the existing traction systems drive a drum to rotate through a driving device such as a motor to wind the traction rope to pull the trolley to run. During the working process, when the movement of the trolley is blocked, for example, when the material taking device cannot move forward because it encounters large pieces of materials that are difficult to dig, the trolley stops moving. To avoid damage to the traction rope that pulls the trolley to run due to being in a stretched state for a long time, it is necessary to stop the operation of the motor and then start the motor after the blockage is removed. Since the blockage will be encountered many times during the working process, it is necessary to frequently start and stop the motor. Otherwise, it may cause the traction rope to break due to stretching, which is inconvenient to operate, causes great damage to the equipment, and has low safety. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the driving device of the trolley traction system in the prior art needs to be frequently started and stopped, so as to provide a trolley traction system that can avoid frequent starting and stopping of the driving device.

[0004] Another technical problem to be solved by the present invention is to overcome the defect that the driving device of the trolley traction system of the ship unloader in the prior art needs to be frequently started and stopped, so as to provide a ship unloader that can avoid frequent starting and stopping of the driving device of the trolley traction system.

[0005] To solve the above technical problems, a trolley traction system provided by the present invention includes: a pulley assembly; a traction rope that bypasses the pulley assembly and is connected to both sides of the running trolley along the running direction, and is adapted to provide a traction force to the running trolley; a driving device including a driving part and a rotating part, the driving part drives the rotating part to rotate, the traction rope is wound around the rotating part, the traction rope has a tensioned state that compresses the rotating part and a relaxed state that releases the rotating part, and the rotating part is adapted to drive the traction rope to move when the traction rope is in the tensioned state; a tensioning device that abuts against the traction rope, and the tensioning device is adapted to adjust the switching of the traction rope between the tensioned state and the relaxed state.

[0006] Optionally, the tensioning device includes a rotating rod rotatably disposed on an external structure. The two ends of the rotating rod are arranged vertically and respectively abut against the towing rope, and the rotating rod adjusts the tightness of the towing rope by rotating relative to the external structure.

[0007] Optionally, a first tensioning wheel and a second tensioning wheel are respectively arranged at the two ends of the rotating rod. The first tensioning wheel is located relatively above the second tensioning wheel, and the towing rope bypasses the first tensioning wheel and the second tensioning wheel.

[0008] Optionally, the tensioning device further includes a tensioning driving part connected to the rotating rod and adapted to drive the rotating rod to rotate.

[0009] Optionally, the rotating rod is rotatably connected to the external structure through a hinge point. The tensioning driving part drives the rotating rod to rotate around the hinge point in a first rotation direction to loosen the towing rope; or the tensioning driving part drives the rotating rod to rotate around the hinge point in a second rotation direction to tension the towing rope.

[0010] Optionally, the trolley towing system further includes a detection device correspondingly arranged with the running trolley and adapted to detect the start and stop of the running trolley, and control the tensioning driving part to act when detecting the stop of the running trolley, so as to switch the towing rope to the slack state.

[0011] Optionally, the pulley assembly includes a first fixed pulley group and a second fixed pulley group respectively arranged at both ends of the running direction of the running trolley and adapted to fix the position of the towing rope and change the direction of the towing rope.

[0012] Optionally, the pulley assembly further includes:

[0013] A first redirecting wheel is arranged between the first tensioning wheel and the second fixed pulley group. The towing rope sequentially bypasses the first fixed pulley group, the first redirecting wheel, the first tensioning wheel and the second fixed pulley group and then winds on the rotating part.

[0014] A second redirecting wheel is arranged on the side of the second tensioning wheel away from the driving device. The towing rope sequentially bypasses the rotating part, the second redirecting wheel and the second tensioning wheel and then is connected to the running trolley.

[0015] Optionally, the rotating part selectively rotates clockwise or counterclockwise to provide the running trolley with traction forces in different directions through the towing rope.

[0016] Optionally, the rotating part is a friction cylinder adapted to provide frictional force to the towing rope when the towing rope is in a tensioned state.

[0017] The ship unloader provided by the present invention includes: the trolley traction system as described above.

[0018] The technical solution of the present invention has the following advantages:

[0019] 1. In the trolley traction system provided by the present invention, by setting that the traction rope has a tensioned state for pressing the rotating part and a relaxed state for releasing the rotating part, setting the driving part to drive the rotating part to rotate, when the traction rope is in the tensioned state, it is driven by the rotating part to rotate, and setting the tensioning device to adjust the switching of the traction rope between the tensioned state and the relaxed state. When the tensioning device adjusts the traction rope to the tensioned state, the rotating part drives the traction rope to move, thereby pulling the running trolley to run. When the tensioning device adjusts the traction rope to the relaxed state, the rotating part cannot drive the traction rope to move, and thus cannot provide traction force for the running trolley. Therefore, it is realized to adjust whether the traction rope provides traction force for the running trolley through the tensioning device. In this process, only by adjusting the tightness state of the traction rope through the tensioning device can the presence or absence of the traction force on the traction rope be realized. The operation is convenient, there is no need to frequently start and stop the driving device, which is beneficial to extending the service life of the driving device, saving costs, and effectively improving the stability of traction.

[0020] 2. In the trolley traction system provided by the present invention, by setting that the upper and lower ends of the rotating rod are respectively in contact with the traction rope, the support of the two ends of the rotating rod to the traction rope is realized. By rotating the rotating rod relative to the external structure, the tightening degree of the rotating rod on the traction rope can be adjusted, and thus the tightness degree of the traction rope can be adjusted. The structure is simple and the operation is convenient.

[0021] 3. In the trolley traction system provided by the present invention, by setting a detection device to detect the start and stop of the running trolley and controlling the tensioning driving part to act when the running trolley is detected to stop, it is further ensured that the traction rope can be timely switched to the relaxed state, the degree of automation is improved, and the traction rope is protected from being broken.

[0022] 4. In the trolley traction system provided by the present invention, by setting that the rotating part can rotate both clockwise and counterclockwise, it is realized that only by changing the rotation direction of the rotating part can the direction of the traction force of the traction rope on the running trolley be changed, and thus the running direction of the running trolley can be changed. The structure is simple, the operation is convenient, and the working efficiency is high. Description of the Drawings

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Structural schematic diagram of the ship unloader of the present invention;

[0025] Figure 2 Structural schematic diagram of the trolley traction system of the present invention;

[0026] Figure 3 Structural schematic diagram of the driving device of the present invention.

[0027] Explanation of reference numerals:

[0028] 2. Cabin; 4. Wharf foundation; 10. Gantry main body; 11. Gantry leg; 20. Main beam; 21. Rotating boom; 30. Traveling trolley; 100. Loading and unloading device; 500. Trolley traction system; 501. Traction rope; 510. Driving device; 511. Driving part; 512. Rotating part; 513. Reducer; 521. Rotating rod; 522. First tensioning pulley; 523. Second tensioning pulley; 524. Tensioning driving part; 525. Hinge point; 526. Rotating part; 531. First fixed pulley group; 532. Second fixed pulley group; 533. First redirecting pulley; 534. Second redirecting pulley. Specific embodiments

[0029] The following will clearly and completely describe the technical solutions of the present invention with reference to the drawings. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Embodiment 1

[0034] Combined with Figures 1 - 3 As shown, the trolley traction system provided in this embodiment includes:

[0035] A pulley assembly;

[0036] A traction rope 501, which bypasses the pulley assembly and is connected to both sides of the running trolley 30 along the running direction, and is adapted to provide traction force to the running trolley 30;

[0037] A driving device 510, including a driving part 511 and a rotating part 512, the driving part 511 drives the rotating part 512 to rotate, the traction rope 501 is wound around the rotating part 512, the traction rope 501 has a tensioned state that presses the rotating part 512 and a relaxed state that releases the rotating part 512, and the rotating part 512 is adapted to drive the traction rope 501 to move when the traction rope 501 is in the tensioned state;

[0038] A tensioning device, which abuts against the traction rope 501, and the tensioning device is adapted to adjust the switching of the traction rope 501 between the tensioned state and the relaxed state.

[0039] It should be noted that the running direction refers to Figure 2The "running direction" indicated by the arrow. The running trolley moves along the running direction. The two sides of the running trolley 30 along the running direction refer to the two side surfaces at the two ends of the running trolley 30 facing the running direction. The traction rope 501 is wound around the rotating part 512. When the traction rope 501 is in the tension state, the traction rope 501 is tightened and presses against the rotating part 512. There is an interaction force between the rotating part 512 and the traction rope 501. The rotating part 512 drives the traction rope 501 to move, realizing the traction of the running trolley 30. When the traction rope 501 is in the slack state, there is no interaction force between the traction rope 501 and the rotating part 512, and the rotating part 512 cannot drive the traction rope 501 to move.

[0040] It should be noted that when the running trolley 30 encounters an obstacle during operation and cannot continue to move, if the traction rope 501 still has a traction force on the running trolley 30, the traction rope 501 may break due to being in a stretched state for a long time, which is somewhat dangerous. Therefore, it is necessary to remove the traction force of the traction rope 501 on the running trolley 30 when the running trolley 30 stops running. In the prior art, the presence or absence of the traction force in the traction rope 501 is controlled by starting and stopping the motor of the driving device. However, the frequent starting and stopping of the motor results in poor traction stability and seriously affects the service life of the motor. Among them, the running trolley 30 can be the trolley on a ship unloader. A material taking device 100 is connected to the running trolley 30. The obstacles encountered during the operation of the running trolley 30 can be materials that are difficult to dig during the material digging process by the material taking device 100, etc.

[0041] The trolley traction system provided in this embodiment realizes the adjustment of whether the traction rope 501 provides traction to the running trolley 30 through the tensioning device. By setting the traction rope 501 to have a tensioned state that compresses the rotating part 512 and a relaxed state that releases the rotating part 512, setting the driving part 511 to drive the rotating part 512 to rotate, when the traction rope 501 is in the tensioned state, it is driven by the rotating part 512 to rotate, and setting the tensioning device to adjust the switching of the traction rope 501 between the tensioned state and the relaxed state. When the tensioning device adjusts the traction rope 501 to the tensioned state, the rotating part 512 drives the traction rope 501 to move, thereby pulling the running trolley 30 to run. When the tensioning device adjusts the traction rope 501 to the relaxed state, the rotating part 512 cannot drive the traction rope 501 to move, and thus cannot provide traction to the running trolley 30. In this process, only by adjusting the tightness state of the traction rope 501 through the tensioning device can the presence or absence of the traction force on the traction rope 501 be realized. The operation is convenient, there is no need to frequently start and stop the driving device 510, which is beneficial to extending the service life of the driving device 510, saving costs, and effectively improving the stability of traction.

[0042] Preferably, the driving part 511 is a driving motor. A speed reducer 513 is arranged between the driving motor and the rotating part 512. The rotating part 512 is installed on a fixed support. The driving motor is connected to the rotating part 512 through the speed reducer 513, which can realize the adjustment of the rotation speed of the rotating part 512. The driving motor and the speed reducer 513 are widely used, highly reliable, and have flexible operation.

[0043] Preferably, the traction rope 501 is a steel wire rope, which has a firm structure, high stability and reliability.

[0044] Specifically, the tensioning device includes: a rotating rod 521 rotatably arranged on an external structure. The two ends of the rotating rod 521 are arranged vertically and respectively abut against the traction rope 501. The rotating rod 521 adjusts the tightness degree of the traction rope 501 by rotating relative to the external structure. It should be noted that the "up and down" refers to Figure 2 "up and down" indicated by the arrow in the figure; when the trolley traction system is the trolley traction system of a ship unloader, the running trolley 30 runs along the track on the rotating boom 21 of the ship unloader, and the external structure is the structure on the rotating boom 21.

[0045] The trolley traction system provided in this embodiment realizes the support of the two ends of the rotating rod 521 and the traction rope 501 by setting the upper and lower ends of the rotating rod 521 to be in contact with the traction rope 501 respectively. By rotating the rotating rod 521 relative to the external structure, the tightening degree of the rotating rod 521 on the traction rope 501 can be adjusted, so that the tightening degree of the traction rope 501 can be adjusted. The structure is simple and the operation is convenient.

[0046] Specifically, a first tension pulley 522 and a second tension pulley 523 are respectively arranged at the two ends of the rotating rod 521. The first tension pulley 522 is located relatively above the second tension pulley 523, and the traction rope 501 bypasses the first tension pulley 522 and the second tension pulley 523. The traction rope 501 is located in the sliding grooves of the first tension pulley 522 and the second tension pulley 523, with small friction, and can prevent the traction rope 501 from slipping out, increasing the stability of the structure.

[0047] Specifically, the tensioning device further includes: a tensioning driving part 524, which is connected to the rotating rod 521 and is adapted to drive the rotating rod 521 to rotate. By driving the rotating rod 521 to rotate through the tensioning driving part 524, the operation is convenient and the degree of automation is high.

[0048] Preferably, the tensioning driving part 524 is a telescopic mechanism. As an implementation manner, the tensioning driving part 524 is a hydraulic cylinder. By the extension or retraction of the telescopic rod of the hydraulic cylinder, the rotating rod 521 is driven to rotate in different directions. The telescopic oil cylinder is relatively common, with reliable structure and simple operation. It can be understood that as an alternative implementation manner, the tensioning driving part 524 can also be an electric push rod, and the rotating rod 521 is driven to rotate in different directions by the extension and retraction of the electric push rod. The electric push rod has flexible operation and low cost.

[0049] Specifically, the trolley traction system further includes: a detection device, which is correspondingly arranged with the running trolley 30 and is adapted to detect the start and stop of the running trolley 30, and control the tensioning driving part 524 to act when detecting that the running trolley 30 stops, so as to switch the traction rope 501 to the slack state. It should be noted that when the running trolley 30 stops, in order to avoid the traction rope 501 being in an over-stretched state for a long time, it is necessary to switch the traction rope 501 to the slack state to ensure that the traction rope 501 no longer moves with the rotation of the rotating part 512, so as to remove the traction force in the traction rope 501.

[0050] The trolley traction system provided by this embodiment detects the start and stop of the running trolley 30 through a detection device, and controls the tension driving part 524 to act when it detects that the running trolley 30 stops, further ensuring that the traction rope 501 can be switched to the slack state in time, improving the degree of automation, and protecting the traction rope 501 from being broken.

[0051] Preferably, the detection device is a displacement sensor. The position of the running trolley 30 is detected through the position sensor, so as to judge whether the running trolley 30 stops. The displacement sensor is widely used and has high reliability.

[0052] Specifically, the pulley assembly includes: a first fixed pulley group 531 and a second fixed pulley group 532, which are respectively arranged at both ends of the running direction of the running trolley 30, and are adapted to fix the position of the traction rope 501 and change the direction of the traction rope 501. It should be noted that the running direction refers to Figure 2 the "running direction" indicated by the arrow in ; the first fixed pulley group 531 and the second fixed pulley group 532 can be fixed on fixed structures such as the rotating boom 21 or the main beam 20; the first fixed pulley group 531 and the second fixed pulley group 532 are arranged at opposite ends of the running direction of the running trolley 30, and the running trolley 30 moves back and forth between the first fixed pulley group 531 and the second fixed pulley group 532 under the traction of the traction rope 501.

[0053] Preferably, the first fixed pulley group 531 includes two adjacent fixed pulleys, and the second fixed pulley group 532 includes two fixed pulleys arranged at intervals to support the traction rope 501 and redirect the traction rope 501.

[0054] Specifically, the pulley assembly further includes:

[0055] A first redirecting wheel 533 is arranged between the first tensioning wheel 522 and the second fixed pulley group 532. The traction rope 501 sequentially bypasses the first fixed pulley group 531, the first redirecting wheel 533, the first tensioning wheel 522 and the second fixed pulley group 532 and then winds around the rotating part 512;

[0056] A second redirecting wheel 534 is arranged on the side of the second tensioning wheel 523 away from the driving device 510. The traction rope 501 sequentially bypasses the rotating part 512, the second redirecting wheel 534, the second tensioning wheel 523 and then is connected to the running trolley 30.

[0057] It should be noted that the towing rope 501 in the trolley towing system provided in this embodiment is a steel wire rope. One end of the towing rope 501 is connected to the frame on the running direction side of the running trolley 30, and successively bypasses the first fixed pulley group 531, the first redirecting pulley 533, the first tensioning pulley 522, the second fixed pulley group 532, the rotating part 512, the second redirecting pulley 534, and the second tensioning pulley 523, and then is connected to the frame on the other side of the running trolley 30 in the running direction to tow the running trolley 30 to run along the running direction. During the running of the running trolley 30, the towing rope 501 in its advancing direction is subjected to a tensile force.

[0058] Specifically, the rotating rod 521 is rotatably connected to the external structure through a hinge point 525, and the tensioning driving part 524 drives the rotating rod 521 to rotate around the hinge point 525 in the first rotating direction to relax the towing rope 501; or, the tensioning driving part 524 drives the rotating rod 521 to rotate around the hinge point 525 in the second rotating direction to tension the towing rope 501.

[0059] It should be noted that the tensioning driving part 524 is rotatably connected to the rotating part 526 on the rotating rod 521. Optionally, as shown in Figure 2 If the rotating part 526 is arranged below the hinge point 525, when the telescopic rod of the tensioning driving part 524 extends, it drives the rotating rod 521 to rotate clockwise around the hinge point 525, and the towing rope 501 is relaxed and switched to the slack state; when the telescopic rod of the tensioning driving part 524 retracts, it drives the rotating rod 521 to rotate counterclockwise around the hinge point 525, and the towing rope 501 is tightened and switched to the tensioned state. It can be understood that as an alternative implementation, the rotating part 526 can also be arranged above the hinge point 525. When the telescopic rod of the tensioning driving part 524 retracts, it drives the rotating rod 521 to rotate clockwise around the hinge point 525, and the towing rope 501 is relaxed and switched to the slack state; when the telescopic rod of the tensioning driving part 524 extends, it drives the rotating rod 521 to rotate counterclockwise around the hinge point 525, and the towing rope 501 is tightened and switched to the tensioned state. Among them, the "below" refers to the direction where the arrow in Figure 2 points to "down", and the "above" refers to the direction where the arrow in Figure 2 points to "up"; the first rotating direction is the clockwise direction, and the second rotating direction is the counterclockwise direction; when the trolley towing system is applied to a ship unloader, the external structure is the rotating boom 21 of the ship unloader.

[0060] Specifically, the rotating part 512 selectively rotates clockwise or counterclockwise to provide traction forces in different directions to the moving trolley 30 through the traction rope 501. By setting that the rotating part 512 can rotate both clockwise and counterclockwise, it is realized that the direction of the traction force of the traction rope 501 on the moving trolley 30 can be changed only by changing the rotation direction of the rotating part 512, so as to realize changing the running direction of the moving trolley 30. The structure is simple, the operation is convenient and the working efficiency is high.

[0061] Specifically, the rotating part 512 is a friction cylinder, and the friction cylinder is adapted to provide frictional force to the traction rope 501 when the traction rope 501 is in a tensioned state. It should be noted that the friction cylinder is made of special materials. The steel wire rope is wound around the friction cylinder. When the steel wire rope is in a tensioned state, the friction cylinder is subjected to the pressure of the steel wire rope, and frictional force will be generated between the friction cylinder and the steel wire rope, so as to drive the movement of the steel wire rope through the rotation of the friction cylinder; when the steel wire rope is in a relaxed state, since the pressure of the steel wire rope on the friction cylinder is 0, no frictional force is generated between the friction cylinder and the steel wire rope, so the friction cylinder rotates idly and the steel wire rope does not move. The friction cylinder plays the role of winding the steel wire rope and does not take in or release the steel wire rope.

[0062] Taking the application of the trolley traction system in a ship unloader as an example, the working process of the trolley traction system will be described:

[0063] Under normal working conditions, the moving trolley 30 drives the material taking device 100 to move back and forth in the ship width direction for material taking operations. When the moving trolley 30 stops moving due to obstacles in its forward direction, the detection device senses the stop of the movement of the moving trolley 30, and then controls the tensioning device to act to adjust the tension degree of the traction rope 501, so that the traction rope 501 is switched to a relaxed state, no frictional force is generated between the traction rope 501 and the rotating part 512, the rotating part 512 rotates idly, and there is no traction force on the traction rope 501, and the moving trolley 30 cannot be tractioned; when the tensioning device returns to its normal working position, the traction rope 501 is tightened, and the rotating part 512 drives the movement of the traction rope 501 by relying on the frictional force between it and the traction rope 501, so as to traction the moving trolley 30 to move. Among them, the process of the tensioning device returning to its normal working position can be controlled manually, or a second detection device for detecting whether the obstacle received by the moving trolley 30 is cleared can be set. When the second detection device detects that the obstacle is cleared, the tensioning device is controlled to return to its normal working position to re-tighten the traction rope 501.

[0064] Embodiment 2

[0065] Combined with Figure 1As shown in the figure, this embodiment provides a ship unloader, including: the trolley traction system 500 as described above.

[0066] Specifically, the ship unloader further includes: a gantry main body 10, the gantry main body 10 has gantry legs 11, and the gantry legs 11 are connected to the dock foundation 4.

[0067] Specifically, the gantry main body 10 further includes a main beam 20. The main beam 20 includes a rotating boom 21 extending beyond the gantry legs 11. The rotating boom 21 is suitable for performing pitching movements. A trolley traction system 500 is provided between the rotating boom 21 and the main beam 20. The traveling trolley 30 is suitable for moving along the track on the rotating boom 21 when the rotating boom 21 is laid flat. A material taking device 100 is connected to the traveling trolley 30. The traveling trolley 30 drives the material taking device 100 to move along the track on the rotating boom 21, so that the material taking device 100 moves back and forth in the ship width direction to unload the materials in the cargo hold 2. Among them, the "above" refers to Figure 1 "up" indicated by the arrow in Figure 1 ; the ship width direction refers to

[0068] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A car traction system, characterized in that, Comprising: A pulley assembly; A towing rope (501) that bypasses the pulley assembly and is connected to both sides of the running trolley (30) along the running direction, and is adapted to provide a traction force to the running trolley (30); A driving device (510), including a driving part (511) and a rotating part (512), the driving part (511) drives the rotating part (512) to rotate, the towing rope (501) is wound around the rotating part (512), the towing rope (501) has a tensioned state that presses the rotating part (512) and a relaxed state that releases the rotating part (512), and the rotating part (512) is adapted to drive the towing rope (501) to move when the towing rope (501) is in the tensioned state; A tensioning device that abuts against the towing rope (501), and the tensioning device is adapted to adjust the switching of the towing rope (501) between the tensioned state and the relaxed state; The tensioning device includes: a rotating rod (521) rotatably arranged on an external structure, both ends of the rotating rod (521) are arranged vertically and respectively abut against the towing rope (501), and the rotating rod (521) adjusts the tightness of the towing rope (501) by rotating relative to the external structure; The tensioning device further includes: a tensioning driving part (524), the tensioning driving part (524) is connected to the rotating rod (521) and is adapted to drive the rotating rod (521) to rotate; The rotating rod (521) is rotatably connected to the external structure through a hinge point (525); The tensioning driving part (524) is rotatably connected to a rotating part (526) on the rotating rod (521), the rotating part (526) is arranged below the hinge point (525), or the rotating part (526) is arranged above the hinge point (525).

2. The trolley traction system according to claim 1, characterized in that, Both ends of the rotating rod (521) are respectively provided with a first tensioning wheel (522) and a second tensioning wheel (523), the first tensioning wheel (522) is located relatively above the second tensioning wheel (523), and the towing rope (501) bypasses the first tensioning wheel (522) and the second tensioning wheel (523).

3. The trolley traction system according to claim 1, characterized in that, The tensioning driving part (524) drives the rotating rod (521) to rotate around the hinge point (525) along a first rotation direction to relax the towing rope (501); or the tensioning driving part (524) drives the rotating rod (521) to rotate around the hinge point (525) along a second rotation direction to tension the towing rope (501).

4. The trolley traction system according to claim 1, characterized in that, Further comprising: A detection device correspondingly arranged with the running trolley (30), adapted to detect the start and stop of the running trolley (30), and control the tensioning driving part (524) to act when detecting that the running trolley (30) stops, so as to switch the towing rope (501) to the relaxed state.

5. The trolley traction system according to claim 2, characterized in that, The pulley assembly includes: a first fixed pulley set (531) and a second fixed pulley set (532), which are respectively arranged at both ends of the running direction of the running trolley (30), and are adapted to fix the position of the towing rope (501) and change the direction of the towing rope (501).

6. The trolley traction system according to claim 5, characterized in that, The pulley assembly further includes: a first redirecting pulley (533), which is arranged between the first tensioning pulley (522) and the second fixed pulley set (532), and the towing rope (501) sequentially bypasses the first fixed pulley set (531), the first redirecting pulley (533), the first tensioning pulley (522) and the second fixed pulley set (532) and then winds around the rotating part (512); a second redirecting pulley (534), which is arranged on the side of the second tensioning pulley (523) away from the driving device (510), and the towing rope (501) sequentially bypasses the rotating part (512), the second redirecting pulley (534), the second tensioning pulley (523) and then is connected to the running trolley (30).

7. The trolley traction system according to claim 1, wherein The rotating part (512) selectively rotates clockwise or counterclockwise to provide the running trolley (30) with traction forces in different directions through the towing rope (501).

8. The trolley traction system according to any one of claims 1-7, characterized in that, The rotating part (512) is a friction cylinder, and the friction cylinder is adapted to provide frictional force to the towing rope (501) when the towing rope (501) is in a tensioned state.

9. A ship unloader, characterized in that, It includes: a trolley towing system (500) as described in any one of the above claims 1-8.

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