A single main rope small tonnage cable crane system

Abstract

This utility model provides a single-main-cable small-tonnage cable crane system, which relates to a crane system including: two cable towers, one of which is equipped with a traction pulley; a load-bearing cable, a first traction cable, a second traction cable, and a lifting cable are arranged between the two cable towers; a crane structure and a lifting structure are also arranged between the two cable towers; a first retraction structure and a second retraction structure are also arranged on the cable tower side without the traction pulley. The first retraction structure realizes the translation of the crane structure by retracting the first and second traction cables, and the second retraction structure realizes the lifting by retracting the lifting cable. In this application, a single-sided retraction structure is used to realize the retraction of the two traction cables, avoiding the additional economic costs caused by arranging retraction structures on both sides. At the same time, the first retraction structure realizes the retraction of the two traction cables without the need for a monitoring system for real-time speed monitoring and dynamic coordinated control, further reducing costs.

Description

Technical Field

[0001] This utility model relates to crane systems, and more particularly to a single main cable small-tonnage cable crane system. Background Technology

[0002] The crane system typically employs a twin-tower independent structure design, with two cable towers forming the main frame. The core components include the main cable system erected between the two towers, the overhead crane mechanism traveling along the main cable, and the associated traction device. In heavy-duty lifting scenarios, the system uses a load-bearing cable (400) formed by multiple strands of twisted steel wire ropes to bear the bulk load, working in conjunction with traction winches positioned on both sides of the twin towers to achieve precise crane positioning. During traction, real-time monitoring and dynamic coordinated control of the traction speed of the two winches are required to ensure the safety of lifting operations involving large-tonnage components (typically exceeding 20 tons).

[0003] However, when the system handles small to medium-tonnage components (≤20 tons), the resources consumed are not proportional to the output, which can easily lead to waste of resources and slow operation. Therefore, there is room for optimization in the existing crane system when hoisting small to medium-tonnage components to reduce costs and improve operational efficiency. Utility Model Content

[0004] This utility model provides a single main cable small-tonnage cable crane system, which aims to solve the problem of resource waste when using large-tonnage cranes to lift small-tonnage components. It improves operating efficiency and reduces costs by adopting a single main cable (load-bearing cable) and single-sided traction.

[0005] To achieve the above objectives, embodiments of this utility model provide a single-main-cable small-tonnage cable crane system, comprising:

[0006] The first cable tower and the second cable tower are arranged at an interval, and a traction pulley is provided on the second cable tower;

[0007] The overhead crane structure includes a translation mechanism and a lifting mechanism. The lifting mechanism is located below the translation mechanism. The translation mechanism includes a first traveling wheel, and the lifting mechanism includes a lifting wheel.

[0008] A hoisting structure is installed below the overhead crane structure, and the hoisting structure includes hoisting pulleys;

[0009] A load-bearing cable is fixed between the first tower and the second tower, and the first traveling wheel travels on the load-bearing cable.

[0010] A first traction cable and a second traction cable, wherein one end of the first traction cable is connected to the first retracting structure, and the other end is wound around the traction fixed pulley and connected to the translation mechanism; one end of the second traction cable is connected to the first retracting structure, and the other end is connected to the translation mechanism.

[0011] The lifting cable has one end fixed to the second tower, and the other end is wound around the lifting wheel and the hoisting pulley and connected to the second take-up and release structure. The first take-up and release structure and the second take-up and release structure are located on one side of the first tower.

[0012] The first retraction and extension structure enables the translation mechanism to move horizontally by retracting and extending the first traction cable and the second traction cable;

[0013] The second retraction and release structure retracts and releases the lifting cable to achieve the lifting and lowering of the hoisting structure.

[0014] Preferably, a lifting anti-twist limiter is also provided between the lifting mechanism and the hoisting structure. The lifting anti-twist limiter includes a first limit frame. A semi-circular steel pipe is provided in the first limit frame along the length direction of the first limit frame, and a plurality of first rollers are provided in the first limit frame perpendicular to the length direction. The plurality of first rollers and the semi-circular steel pipe form a first through hole for the lifting cable to pass through.

[0015] The first limiting frame can move between the lifting mechanism and the hoisting structure.

[0016] Preferably, the translation mechanism includes two translation frames, each translation frame having at least one first traveling wheel; the lifting mechanism includes a lifting frame, the lifting frame being pivotally connected to the two translation frames respectively, the lifting wheel being rotatably disposed within the lifting frame, and the lifting wheel having n wheels, where n is an odd number greater than or equal to 3;

[0017] The hoisting structure includes a hoisting frame, and the hoisting pulleys are rotatably disposed within the hoisting frame. There are n-1 hoisting pulleys. The lifting cable is alternately wound around the lifting pulleys and the hoisting pulleys.

[0018] Preferably, the lifting rope anti-twist limiter further includes a first automatic rope retractor, two of which are disposed on the lifting frame. Each first automatic rope retractor has a coilable limiting connecting rope, which is connected to the first limiting frame to adjust the distance between the first limiting frame and the lifting mechanism and the hoisting structure.

[0019] Preferably, the hoisting frame is further provided with a second roller and a third roller, with the second roller disposed between the third rollers, and the axial direction of the third rollers being orthogonally distributed with the axial direction of the second rollers to form a second through hole for the lifting cable to pass through.

[0020] Preferably, the single main cable small-tonnage cable crane system further includes a support device, which includes an upper support frame and a lower support frame. The upper support frame is pivotally connected to the lower support frame. A second traveling wheel is provided inside the upper support frame for traveling on the load-bearing cable. The lower support frame is provided with a first support wheel, a second support wheel, and a third support wheel from top to bottom. The first support wheel is used to support a first traction cable or a second traction cable, the second support wheel is used to support the first traction cable, and the third support wheel is used to support the lifting cable.

[0021] The second support wheel is provided between the lifting wheel and the first traveling wheel.

[0022] Preferably, a second automatic rope take-up device is provided at the upper end of the support cable frame, the second automatic rope take-up device is wound with the support cable connecting rope, and the other end of the support cable connecting rope is connected to the adjacent second automatic rope take-up device or the crane structure.

[0023] Preferably, the first automatic rope take-up device and the second automatic rope take-up device have the same structure, including a box body (235a), a take-up shaft (235b) is installed inside the box body (235a), a spring (235c) is installed on the outer sleeve of the take-up shaft (235b), one end of the spring (235c) is connected to the take-up shaft (235b), and the other end is connected to the box body (235a). The box body (235a) is also provided with a cable outlet hole. The support cable connecting rope or the limiting connecting rope passes through the cable outlet hole and is fixedly connected to the take-up shaft (235b) inside the box body (235a).

[0024] Preferably, the first tower is further provided with a first guide wheel for guiding and changing the direction of the first traction cable, the second traction cable, and the lifting cable.

[0025] Preferably, the first take-up and release structure is a reciprocating friction winch, and the first traction cable and the second traction cable are connected to different take-up reels of the reciprocating friction winch.

[0026] The second winding structure is a winch.

[0027] The above-mentioned solution of this utility model has the following beneficial effects:

[0028] Unlike existing methods that use retraction structures on both sides of the pylon, this application adopts a single-sided retraction structure. The first retraction structure is used to move the pylon structure horizontally, thereby enabling the transportation of hoisted components. The single-sided retraction structure reduces the space required and the investment in auxiliary equipment. In addition, the position of the pylon structure can be adjusted by a single piece of equipment in the first retraction structure. Compared with retraction structures on both sides, products used for real-time monitoring and dynamic collaborative control can be eliminated, further reducing costs.

[0029] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0030] Figure 1 This is an overall schematic diagram of the present invention;

[0031] Figure 2 This is a schematic diagram showing the connection between the first and second traction ropes;

[0032] Figure 3 This is a diagram showing the connection of the lifting ropes;

[0033] Figure 4 This is a schematic diagram of the overhead crane structure;

[0034] Figure 5 This is a schematic diagram of the hoisting structure;

[0035] Figure 6 yes Figure 5 Schematic diagram of the CC section;

[0036] Figure 7 This is a schematic diagram of a cable support structure;

[0037] Figure 8 This is a schematic diagram of the internal structure of the first automatic rope retractor;

[0038] Figure 9 This is a schematic diagram of a crane anti-twist limit switch;

[0039] Figure 10 yes Figure 9 A schematic diagram of the DD section;

[0040] Figure 11 yes Figure 1 Enlarged view in section E.

[0041] [Explanation of Labels in the Attached Image]

[0042] A - First cable tower, b - Second cable tower, A1 - First guide wheel

[0043] 100-Traction fixed pulley,

[0044] 200-Head crane structure,

[0045] 210 - Translation mechanism, 211 - First traveling wheel, 212 - Translation frame,

[0046] 220 - Lifting mechanism, 221 - Crane roller, 222 - Lifting frame

[0047] 230-Lifting anti-twist limiter, 231-First limit frame, 232-Semi-circular steel pipe, 233-First roller, 234-First through hole, 235-First automatic rope take-up device, 236-Limit connecting rope, 235a-Box (235a), 235b-Take-up shaft (235b), 235c-Clock spring (235c);

[0048] 240-Stabilizer, 241-Stabilizer upper frame, 242-Stabilizer lower frame, 243-Rotating shaft, 244-Second traveling wheel, 245-First support wheel, 246-Second support wheel, 247-Third support wheel, 248-Second automatic rope take-up device, 249-Stabilizer connecting rope,

[0049] 300 - Lifting structure, 310 - Lifting pulley, 320 - Lifting frame, 330 - Second roller, 340 - Third roller, 350 - Second through hole

[0050] 400-load-bearing cable

[0051] 500-First traction cable,

[0052] 600-Second traction cable,

[0053] 700-Lifting Cable

[0054] 800 - First retraction and extension structure,

[0055] 900 - Second expansion and contraction structure. Detailed Implementation

[0056] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0057] like Figures 1-11 As shown, an embodiment of this utility model provides a single-main-cable small-tonnage cable crane system, such as... Figures 1-3 The system includes a first cable tower A and a second cable tower B spaced apart, with a hoisting area between them. A traction pulley 100 is installed on the second cable tower B. A crane structure 200 and a hoisting structure 300 are also installed between the first cable tower A and the second cable tower B. The crane structure 200 includes a translation mechanism 210 and a lifting mechanism 220. The lifting mechanism 220 is located below the translation mechanism 210 and can drive the lifting mechanism 220 to move synchronously. The translation mechanism 210 includes a first traveling wheel 211, and the lifting mechanism 220 includes a lifting wheel 221. The hoisting structure 300 is located below the crane structure 200 and includes a hoisting pulley 310.

[0058] To enable the crane structure 200 and the hoisting structure 300 to move between the first tower A and the second tower B, several cables are installed between the two towers, including a load-bearing cable 400, a first traction cable 500, a second traction cable 600, and a lifting cable 700. The load-bearing cable 400 serves as the main cable, with both ends fixed to the first tower A and the second tower B respectively. The first traveling wheel 211 travels on the load-bearing cable 400, which bears the weight of the crane structure 200 and the hoisting structure 300. One end of the first traction cable 500 is connected to the first retraction structure 800, and the other end is wound around the traction pulley 100 and connected to one side of the translation mechanism 210. One end of the second traction cable 600 is connected to the first retraction structure 800, and the other end is connected to the other side of the translation mechanism 210.

[0059] One end of the lifting cable 700 is fixed to the second tower B, and the other end is wound around the lifting wheel 221 and the hoisting pulley 310 and connected to the second retraction structure 900. The first retraction structure 800 moves the translation mechanism 210 horizontally by retracting or releasing the first traction cable 500 and the second traction cable 600, and the second retraction mechanism raises and lowers the hoisting structure 300 by retracting or releasing the lifting cable 700.

[0060] The aforementioned first and second retractable structures 800 and 900 are located on the same side of the first pylon A. The first retractable structure 800 is a reciprocating friction winch, and the second retractable structure 900 is a conventional winch. Under the action of the first retractable structure 800, the first traction cable 500 releases the line, and the second traction cable 600 simultaneously retracts the line. The two sides of the translation mechanism 210 are connected to the first traction cable 500 and the second traction cable 600, respectively. Therefore, under the traction of the first traction cable 500 and the second traction cable 600, it can move horizontally to adjust the position of the overhead crane structure 200.

[0061] Compared to existing methods that use take-up and take-up structures on both sides of the pylon, this application only requires one take-up and take-up structure to achieve horizontal position adjustment of the crane structure 200, saving one structure. Furthermore, by using a reciprocating friction winch as the first take-up and take-up structure 800, the equipment for real-time monitoring and dynamic coordinated control of traction speed in existing technologies can be omitted, further reducing costs. The reciprocating friction winch has two take-up reels, which are respectively connected to the first traction cable 500 and the second traction cable 600, and the two reels are connected by gears or a timing belt to achieve synchronous cable release and take-up. Since the synchronous cable release and take-up of the reciprocating friction winch is existing technology, it will not be described in detail here.

[0062] When the second retracting structure 900 is laying out the cable, the hoisting structure 300 will descend. At this time, the lifting cable 700 between the hoisting structure 300 and the overhead crane structure 200 will lengthen, which can easily cause cable entanglement. To avoid this phenomenon, a lifting anti-twist limiter 230 is also provided between the hoisting structure 300 and the lifting mechanism 220. The lifting anti-twist limiter 230 includes a first limit frame 231, a semi-circular steel pipe 232 arranged along the length direction of the first limit frame 231, and a first roller 233 arranged perpendicular to the length direction. Multiple first rollers 233 are provided. The first rollers 233 and the semi-circular steel pipe 232 form a first through hole 234 for the lifting cable 700 to pass through.

[0063] The first limiting frame 231 can move between the lifting mechanism 220 and the hoisting structure 300.

[0064] Specifically, refer to Figure 9 , 10 As shown, the first limiting frame 231 is a rectangular frame. Two sets of semi-circular steel pipes 232 are arranged on opposite inner walls of the first limiting frame 231. Each set of semi-circular steel pipes 232 is arranged vertically on the inner surface of the same inner wall, with the protrusions of the two sets of semi-circular steel pipes 232 facing each other. The axial direction of the two sets of semi-circular steel pipes 232 is parallel to the length direction of the rectangular frame. The aforementioned first roller 233 is arranged between each set of semi-circular steel pipes 232. Several first rollers 233 are arranged, and the axial direction of the several first rollers 233 is perpendicular to the axial direction of the semi-circular steel pipes 232. A first through hole 234 is formed between the first roller 233 and the semi-circular steel pipes 232, and the first through hole 234 is used for the lifting cable 700 to pass through.

[0065] Preferably, the distance between the two sets of semicircular steel pipes 232 located on the two opposite inner walls is slightly larger than the diameter of the lifting cable 700. The first limiting frame 231 is provided with bolts along its length direction, and the bolts pass through the first limiting frame 231 along its width direction. The first roller 233 is clearance-fitted onto the bolts.

[0066] The translation mechanism 210 includes two translation frames 212, each with at least one first traveling wheel 211. The lifting mechanism 220 includes a lifting frame 222, which is pivotally connected to the two translation frames 212 below them. Lifting wheels 221 are rotatably disposed within the lifting frame 222. There are n lifting wheels 221, where n is an odd number greater than or equal to 3. The hoisting mechanism includes a hoisting frame 320, with hoisting pulleys 310 rotatably disposed within it. There are n-1 hoisting pulleys 310, and lifting cables 700 are alternately wound around the lifting wheels 221 and the hoisting pulleys 310.

[0067] Specifically, refer to Figure 4 As shown, in this embodiment, the translation frame 212 is provided with two first traveling wheels 211 and one pivot shaft. The two traveling wheels and one pivot shaft are arranged in an equilateral triangle. The pivot shaft is located below the two first traveling wheels 211 for pivotal connection with the upper end of the lifting frame 222. At the same time, the two pivot shafts are also used to connect the aforementioned first traction cable 500 and second traction cable 600.

[0068] The lifting frame 222 is a frame, and the aforementioned lifting rollers 221 are provided at the lower end of the lifting frame 222. n lifting rollers 221 are spaced apart along the length of the lifting frame 222. A second support roller 246 is also provided below the two pivot shafts. The second support roller 246 is used to support the first traction cable 500.

[0069] In this embodiment, n=3.

[0070] The aforementioned lifting rope anti-twist limiter also includes a first automatic rope retractor 235, which is fixed to the lower end of the lifting frame 222. The automatic rope retractor has a coilable limit connecting rope 236, the lower end of which is connected to the first frame.

[0071] Under the action of the first automatic rope retractor 235, the position of the limiting frame between the lifting mechanism 220 and the hoisting structure 300 can be adjusted. Moreover, the limiting frame is provided with a first through hole 234. Setting the limiting frame and adjusting its height can effectively prevent the hoisting rope from getting tangled.

[0072] Preferably, multiple sets of anti-twist limiters for the lifting rope can be provided in the vertical direction to prevent the lifting rope between the lifting mechanism 220 and the hoisting structure 300 from twisting. Multiple sets of limit frames are connected from top to bottom, and the lower first automatic rope retractor 235 is fixed to the upper limit frame or lifting frame 222. The lower end of the limit connecting rope 236 of the first automatic rope retractor 235 is connected to the limit frame.

[0073] After multiple tests, it was found that when the height of the lifting cable 700 between the lifting mechanism 220 and the hoisting structure 300 is less than 20 meters, cable entanglement is less likely to occur. However, in actual work, based on different hoisting environments, the height of the lifting cable 700 between the two may be greater than 20 meters. Several anti-twist limiters for the lifting cable can be added between the lifting mechanism 220 and the hoisting structure 300 to ensure that the height of the lifting cable 700 between the lifting frame 222 and the limit frame, between adjacent limit frames, and between the limit frame and the hoisting structure 300 is less than 20 meters, thereby avoiding excessively high lifting cables 700.

[0074] Furthermore, the hoisting frame 320 is also provided with a second roller 330 and a third roller 340, with anti-twist rollers between the third rollers 340. The axial direction of the third roller 340 is orthogonally distributed with the axial direction of the second anti-twist roller, thereby forming a second through hole 350 for the lifting cable 700 to pass through.

[0075] Reference Figure 5 , 6 As shown, the aforementioned lifting pulley 310 is rotatably mounted on the lifting frame 320. The lifting frame 320 is provided with a second roller 330 and a third roller 340 above the lifting pulley 310. The axial direction of the second roller 330 is parallel to the length direction of the lifting frame 320. There are n-1 groups of second rollers 330 along the length direction of the lifting frame 320, with each group having two second rollers 330. The two second rollers 330 are spaced apart along the width direction of the lifting frame 320. Above the two second rollers 330 at the same length position on the lifting frame 320, the aforementioned two third rollers 340 are provided. The interval between the two third rollers 340 is slightly larger than the diameter of the lifting pulley 310. The axial direction of the third roller 340 is perpendicular to the axial direction of the second roller 330, thus forming a second through hole 350. The second through hole 350 is located above the lifting pulley 310. The lifting cable 700 is wound around the lifting pulley 310 within the same second through hole 350. The second roller 330 and the third roller 340 not only prevent the cable from getting tangled, but also effectively prevent the lifting cable 700 from jumping out of the groove of the lifting pulley 310 due to oblique pulling.

[0076] A hoisting cable for connecting components is provided at the lower end of the hoisting frame 320.

[0077] The single main cable small-tonnage cable crane system also includes a support cable 240, which includes an upper support cable frame 241 and a lower support cable frame 242. The upper support cable frame 241 and the lower support cable frame 242 are pivotally connected. A second traveling wheel 244 is provided in the upper support cable frame 241 for traveling on the load-bearing cable 400. The lower support cable frame 242 is provided with a first support wheel 245, a second support wheel 246 and a third support wheel 247 from top to bottom. The first support wheel 245 is used to support the first traction cable 500 or the second traction cable 600, the second support wheel 246 is used to support the first traction cable 500, and the third support wheel 247 is used to support the lifting cable 700.

[0078] Reference Figures 7-8As shown, a second traveling wheel 244 is provided inside the upper support frame 241, and a rotating shaft 243 is provided below the second traveling wheel 244. The lower support frame 242 is connected to the rotating shaft 243, so that the upper support frame 241 and the lower support frame 242 can rotate around the rotating shaft 243. A first support wheel 245, a second support wheel 246, and a third support wheel 247 are provided on the lower support frame 242.

[0079] Furthermore, a second automatic rope winder 248 is installed at the upper end of the support cable upper frame 241. The second automatic rope winder 248 has a support cable connecting rope 249 coiled around it. The other end of the support cable connecting rope 249 is adjacent to the adjacent second automatic rope winder 248 or the crane structure 200. Understandably, the support cable connecting rope 249 closest to the first tower A and the second tower B can also be connected to the first tower A and the second tower B.

[0080] In this embodiment, the first automatic rope take-up device 235 and the second automatic rope take-up device 248 have the same structure, both including a housing 235a. A take-up shaft 235b is inserted inside the housing 235a. A spring 235c is sleeved on the take-up shaft 235b. One end of the spring 235c is connected to the take-up shaft 235b, and the other end is connected to the housing 235a. The housing 235a is also provided with an outlet hole. The support cable connecting rope 249 or the limiting connecting rope 236 is inserted through the outlet hole and then fixedly connected to the take-up shaft 235b inside the housing 235a.

[0081] The spring 235c can store elastic potential energy to wind the support cable 249 or the limiting cable 236 onto the take-up spool 235b, thereby preventing the support cable 249 or the limiting cable 236 from sagging and thus avoiding cable entanglement. Preferably, the support cable 249 or the limiting cable 236 has a limiting block at one end near the take-up spool 235b, which limits the maximum elongation of the support cable 249 or the limiting cable 236.

[0082] When the first automatic rope retractor 235 is in use, the limiting connecting rope 236 extends to its maximum length under the weight of the lifting anti-twist limiter 230. When it is necessary to shorten the height of the lifting cable 700 between the lifting mechanism 220 and the hoisting structure 300, the first limiting frame 231 moves upward under the top action of the hoisting frame 320, and the first automatic rope retractor 235 performs the function of retracting the rope.

[0083] In this application, the support cable 240 is pivotally connected to an upper and lower part, and the second automatic rope take-up device 248 is located at the upper end of the support cable 240. When the first or second traction rope is pulled, it will cause the lower support cable frame 242 to swing. The pivotally connected upper support cable frame 241 and lower support cable frame 242 can effectively prevent this swing tendency from being transmitted to the upper support cable frame 241, and avoid the upper support cable frame 241 from scraping against the load-bearing cable 400 due to tilting. This can effectively reduce the damage to the load-bearing cable 400 and extend the service life of the load-bearing cable 400.

[0084] The first tower A is also equipped with a first guide wheel A1 for guiding and changing the direction of the first traction cable 500, the second traction cable 600, and the lifting cable 700. Understandably, depending on different usage scenarios, a second guide wheel can also be adaptively set to change the direction of the first traction cable 500, the second traction cable 600, and the lifting cable 700.

[0085] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A single main rope small tonnage cable crane system, characterized by, include: A first cable tower (A) and a second cable tower (B) are arranged at intervals, and a traction pulley (100) is provided on the second cable tower (B). The overhead crane structure (200) includes a translation mechanism (210) and a lifting mechanism (220). The lifting mechanism (220) is located below the translation mechanism (210). The translation mechanism (210) includes a first traveling wheel (211), and the lifting mechanism (220) includes a lifting wheel (221). A hoisting structure (300) is disposed below the overhead crane structure (200), and the hoisting structure (300) includes a hoisting pulley (310). A load-bearing cable (400) is fixed between the first tower (A) and the second tower (B), and the first traveling wheel (211) travels on the load-bearing cable (400); The first traction cable (500) and the second traction cable (600) are connected at one end to the first retracting structure (800) and at the other end to the translation mechanism (210) after being wound around the traction pulley (100). The second traction cable (600) is connected at one end to the first retracting structure (800) and at the other end to the translation mechanism (210). The lifting cable (700) has one end fixed to the second tower (B) and the other end wound around the lifting wheel (221) and the hoisting pulley (310) and then connected to the second retracting structure (900). The first retracting structure (800) and the second retracting structure (900) are located on one side of the first tower (A). The first retraction and extension structure (800) enables the translation mechanism (210) to move in the horizontal direction by retracting and extending the first traction cable (500) and the second traction cable (600); The second retraction structure (900) retracts and releases the lifting cable (700) to achieve the lifting and lowering of the hoisting structure (300).

2. The single-mast small-tonnage cable crane system according to claim 1, characterized in that: A lifting anti-twist limiter (230) is also provided between the lifting mechanism (220) and the hoisting structure (300). The lifting anti-twist limiter (230) includes a first limit frame (231). The first limit frame (231) is provided with a semi-circular steel pipe (232) arranged along the length direction of the first limit frame (231) and a plurality of first rollers (233) arranged perpendicular to the length direction. The plurality of first rollers (233) and the semi-circular steel pipe (232) form a first through hole (234) for the lifting cable (700) to pass through. The first limiting frame (231) can move between the lifting mechanism (220) and the hoisting structure (300).

3. The single-mast small-tonnage cable crane system according to claim 2, characterized in that: The translation mechanism (210) includes two translation frames (212), each translation frame (212) having at least one first traveling wheel (211); the lifting mechanism (220) includes a lifting frame (222), the lifting frame (222) being pivotally connected to the two translation frames (212) respectively, the lifting wheel (221) being rotatably disposed within the lifting frame (222), and the lifting wheel (221) having n units, where n is an odd number greater than or equal to 3; The hoisting structure (300) includes a hoisting frame (320), and the hoisting pulleys (310) are rotatably disposed within the hoisting frame (320). There are n-1 hoisting pulleys (310). The lifting cable (700) is alternately wound around the lifting wheel (221) and the hoisting pulleys (310).

4. The single-mast small-tonnage cable crane system according to claim 3, characterized in that: The lifting anti-twist limiter (230) also includes a first automatic rope retractor (235), two of which are mounted on the lifting frame (222). The first automatic rope retractor (235) has a coilable limiting connecting rope (236), which is connected to the first limiting frame (231) to adjust the distance between the first limiting frame (231) and the lifting mechanism (220) and the hoisting structure (300).

5. The single-mast small-tonnage cable crane system according to claim 3, characterized in that: The hoisting frame (320) is also provided with a second roller (330) and a third roller (340), with the second roller (330) arranged between the third rollers (340). The axial direction of the third roller (340) is orthogonally distributed with the axial direction of the second roller (330) to form a second through hole (350) for the lifting cable (700) to pass through.

6. The single-main-cable small-tonnage cable crane system according to claim 4, characterized in that: The single main cable small-tonnage cable crane system also includes a support device (240), which includes a support upper frame (241) and a support lower frame (242). The support upper frame (241) and the support lower frame (242) are pivotally connected. The support upper frame (241) is provided with a second traveling wheel (244) for traveling on the load-bearing cable (400). The support lower frame (242) is provided with a first support wheel (245), a second support wheel (246) and a third support wheel (247) from top to bottom. The first support wheel (245) is used to support the first traction cable (500) or the second traction cable (600). The second support wheel (246) is used to support the first traction cable (500). The third support wheel (247) is used to support the lifting cable (700). The second support wheel (246) is provided between the lifting wheel (221) and the first traveling wheel (211).

7. The single-mast small-tonnage cable crane system according to claim 6, characterised in that: The upper end of the support cable frame (241) is provided with a second automatic rope take-up device (248), and the second automatic rope take-up device (248) is coiled with a support cable connecting rope (249). The other end of the support cable connecting rope (249) is connected to the adjacent second automatic rope take-up device (248) or the crane structure (200).

8. The single-mast small-tonnage cable crane system according to claim 7, characterised in that: The first automatic rope take-up device (235) and the second automatic rope take-up device (248) have the same structure, including a box body (235a), a take-up shaft (235b) is installed inside the box body (235a), a spring (235c) is installed on the outer sleeve of the take-up shaft (235b), one end of the spring (235c) is connected to the take-up shaft (235b), and the other end is connected to the box body (235a). The box body (235a) is also provided with a cable outlet hole. The support cable connecting rope (249) or the limiting connecting rope (236) is inserted through the cable outlet hole and fixedly connected to the take-up shaft (235b) inside the box body (235a).

9. The single-mast small-tonnage cable crane system according to claim 1, characterized in that: The first tower (A) is also provided with a first guide wheel (A1) for guiding and changing the direction of the first traction cable (500), the second traction cable (600) and the lifting cable (700).

10. The single-mast small-tonnage cable crane system according to claim 1, characterized in that: The first take-up and release structure (800) is a reciprocating friction winch, and the first traction cable (500) and the second traction cable (600) are connected to different take-up reels of the reciprocating friction winch. The second take-up and release structure (900) is a winch.

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