Automatic anti-twisting device for lifting appliance of gantry crane

Abstract

The invention belongs to the technical field of cranes, and particularly discloses an automatic anti-twisting device for a gantry crane lifting appliance, which comprises a lifting transverse plate and two lifting seats arranged on the lifting transverse plate, balance ropes are arranged on two sides of the lifting transverse plate, and two anti-twisting mechanisms are arranged on the lifting transverse plate and used for preventing the lifting appliance from twisting when the lifting transverse plate twists. According to the anti-twisting device, the two balance ropes are arranged, one balance rope tensions the other balance rope and loosens the balance rope, twisting of the hanging transverse plate is avoided, a tensioning rope is arranged on the hanging transverse plate, and a limiting mechanism for tensioning the hanging transverse plate is arranged on the hanging transverse plate. The two balance ropes are respectively connected with the same winch, one balance rope is quickly tightened, the torsion trend of the lifting appliance is accurately limited through the generated constraining force, and the posture of the lifting appliance is stabilized like a positioning anchor point, and the other balance rope is correspondingly loosened, so that a buffer space is reserved for displacement generated by inertia of the lifting appliance.

Description

Technical Field

[0001] The invention belongs to the technical field of cranes, and particularly discloses an automatic anti-twisting device for a portal crane spreader. Background Art

[0002] Portal cranes are often used in places such as ports. Large equipment and spreaders are flexibly connected by wire ropes. When hoisting objects or rotating the spreader, the objects may swing or the wire ropes may twist due to inertia or movement. In order to ensure the stability of the spreader and objects during operation and rotation, it is necessary to ensure that the spreader as a whole remains parallel to the port terminal or horizontal transport vehicle, thereby improving the regularity of the loading and unloading positions and the operating efficiency.

[0003] Currently, some gantry crane spreader anti-twist devices use a drawstring to connect the spreader to the crane body. This approach utilizes the restraining effect of the drawstring to limit the spreader's sway and twisting tendency to a certain extent, alleviating instability during light-load or low-speed operations. However, due to the drawstring's flexible nature and fixed connection method, its restraining effect is greatly reduced when facing heavy-load lifting, high-speed operation, or complex working conditions. Another type of anti-twist device integrates a dynamic rope system on the spreader. When twisting of the spreader is detected, the rope and the spreader are linked to trigger the tightening mechanism, which quickly applies a reverse restraining force to correct the twisting angle. Compared with traditional fixed ropes, this solution achieves dynamic response and more timely control of sudden twisting. However, in actual applications, such devices still have limitations: the response speed and tightening force of the rope are difficult to accurately match different lifting conditions, over-tightening may cause damage to the spreader, or the response may be delayed and the twisting cannot be completely eliminated. For this reason, we propose an automatic anti-twist device for gantry crane spreaders to solve the anti-twist problem. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide an automatic anti-twist device for a gantry crane spreader to solve the above-mentioned problems.

[0005] In order to achieve the above objectives, the present invention provides an automatic anti-twist device for a gantry crane hoist, comprising a hoisting cross plate and two lifting seats arranged on the hoisting cross plate, balance ropes are provided on both sides of the hoisting cross plate, two anti-twist mechanisms are provided on the hoisting cross plate, and the two balance ropes are used to prevent the hoisting cross plate from twisting, one of the balance ropes is tightened and the other balance rope is loosened, a tension rope is provided on the hoisting cross plate, a limiting mechanism for tightening the hoisting cross plate is provided on the hoisting cross plate, and a main control mechanism for detecting the twisting of the hoisting cross plate and driving the balance rope and the tension rope to be retracted and released is provided on the top of the hoisting cross plate.

[0006] Furthermore, the limiting mechanism includes a fixing frame arranged on the hanging horizontal plate, a connecting plate is provided on the top of the fixing frame, an extrusion wheel is movably provided inside the fixing frame, the tension rope is connected to the top of the hanging horizontal plate through the extrusion wheel, and a protective ring is provided between the end of the tension rope and the hanging horizontal plate.

[0007] Furthermore, a slide groove is provided on the inner side of the fixing frame, and a slide rod movably connected to the inside of the slide groove is provided at the end of the extrusion wheel. A U-shaped plate is provided on the outer side of the slide rod, and a guide rod passing through the fixing frame is provided on the side of the U-shaped plate. A spring 1 connected to the inner wall of the fixing frame is provided on the outer side of the guide rod.

[0008] Furthermore, the anti-twisting mechanism includes a connecting frame arranged on the side of the connecting plate, a movable wheel connected to the balance rope is movably provided on the inner side of the connecting frame, a lifting ring is provided on the top of the hanging horizontal plate, a support rope is sleeved on the inner wall of the lifting ring, a fastening ring is provided on the outer side of the support rope, and a connecting plate is provided between the top end of the support rope and the bottom end of the balance rope.

[0009] Furthermore, an axle is provided at the end of the movable wheel, a ring is provided on the outer movable sleeve of the axle, a fixed plate is provided on the inner side of the connecting frame, a strong tension spring is provided between the fixed plate and the ring, and a protective plate that is in movable contact with the balance rope is provided on the inner side of the connecting frame.

[0010] Furthermore, a moving rod is rotatably provided at the end of the shaft, a straight groove movably connected to the moving rod is opened on the side of the connecting frame, a rack is provided on the side of the connecting frame, and a gear meshing with the rack is provided on the outer side of the moving rod.

[0011] Furthermore, an L-shaped plate is provided on the outer side of the movable rod, an active telescopic rod is provided at the bottom of the L-shaped plate, a T-shaped platform is provided on the top of the suspended horizontal plate, a slide connected to the end of the active telescopic rod is movably provided on the outer side of the T-shaped platform, and multiple layers of counterweight blocks are provided on the top of the slide.

[0012] Furthermore, the main control mechanism includes a mounting plate movably arranged between two lifting seats, two hydraulic rods are arranged on the top of the mounting plate, a plurality of slots are arranged on the top of the mounting plate, a winch 1 connected to the balance rope is arranged on the top of the mounting plate, and a winch 2 connected to the tension rope is also arranged on the top of the mounting plate, and the balance rope and the tension rope both movably pass through the slots.

[0013] Furthermore, a torsion detection component is provided on the top of the mounting plate, which is used to detect the torsion of the suspended horizontal plate through a tension rope. The torsion detection component includes two side plates arranged on the top of the mounting plate, a protective shell is provided on the top of the mounting plate, and a resistance rod is provided between the two side plates. An L-shaped groove is provided on the inner side of the mounting plate, and a connecting ring is provided on the outer side of the tension rope. A driven telescopic rod connected to the inner side of the L-shaped groove is provided on the outer side of the connecting ring, and a slide plate is provided on the side of the driven telescopic rod and is sleeved on the outer side of the resistance rod.

[0014] Furthermore, a second spring is provided between the slide plate and the side plate, a limiting groove is provided on the outer side of the resistance rod, a limiting block movably connected to the limiting groove is provided on the inner side of the slide plate, a top plate is provided on the side of the slide plate, an electrical contact head in contact with the resistance rod is provided at the bottom of the top plate, a current detection unit connected to the end of the resistance rod is provided on the side of the side plate, and an electric wire is provided between the current detection unit and the electrical contact head.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The anti-twist device uses a dual-balance rope collaborative working mode. The two balance ropes are connected to the same hoist. When the spreader twists, the two balance ropes exhibit differential tension changes: one balance rope is quickly tightened, and the restraining force generated accurately limits the spreader's twisting tendency, stabilizing the spreader's posture like a positioning anchor. The other balance rope is correspondingly relaxed, leaving a buffer space for the spreader's displacement caused by inertia and preventing excessive deviation of the spreader. The dynamic adjustment mechanism of the two balance ropes, with one tightening and the other loosening, effectively relieves torsional stress, achieves efficient anti-twist control of the spreader, and ensures smooth and safe lifting operations. 2. During the spreader's descent, the limit mechanism continuously acts on the tension rope to keep it taut. When the spreader twists, the tension rope moves, which is captured by the current detection unit and converted into an electrical signal. The current detection unit can quickly and accurately determine the spreader's twisting condition, providing a reliable basis for the activation of subsequent anti-twist measures, ensuring safe and stable lifting operations. 3. Install a counterweight at the center of the top of the spreader. Under normal circumstances, the counterweight remains centered to ensure the stability of the spreader's center of gravity. When the spreader shows a tendency to twist, the anti-twist mechanism responds quickly, driving the balance rope to move the counterweight to the outside of the spreader. By changing the position of the counterweight, the spreader's center of gravity shifts to generate reverse torque, effectively offsetting the torsional force and significantly reducing the spreader's swing amplitude, thereby ensuring dynamic balance and stability during the lifting operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2This is a schematic diagram of the structure of the hanging horizontal plate, lifting seat, counterweight block and anti-twist mechanism in the present invention; Figure 3 Schematic diagram of the structure of the anti-twist mechanism, counterweight block and limit mechanism in the present invention; Figure 4 Schematic diagram of the structure of the anti-twist mechanism and the counterweight block in the present invention; Figure 5 Schematic diagram of the structure of the L-shaped plate, connecting frame and moving wheels in the present invention; Figure 6 Schematic diagram of the exploded structure of the shaft, L-shaped plate, collar and fixing plate in the present invention; Figure 7 Schematic diagram of the structure of the limiting mechanism and the tension rope in the present invention; Figure 8 Schematic diagram of the structure of the main control mechanism in the present invention; Figure 9 Schematic diagram of the cross-sectional structure of the mounting plate in the present invention; Figure 10 for Figure 9 Schematic diagram of the enlarged structure at A; Figure 11 Schematic diagram of the structure of the tension rope and twist detection assembly in the present invention.

[0017] Reference numerals: 1. Lifting seat; 2. Lifting cross plate; 3. Main control mechanism; 31. Mounting plate; 32. Hydraulic rod; 33. Winch 1; 34. Winch 2; 35. Torsion detection assembly; 351. Protective shell; 352. L-shaped groove; 353. Connecting ring; 354. Driven telescopic rod; 355. Slide plate; 356. Resistance rod; 357. Side plate; 358. Spring 2; 359. Current detection unit; 3510. Wire; 3511. Top plate; 3512. Electrical contact; 3513. Limiting groove; 3514. Limiting block; 4. Balancing rope; 5. Tension rope; 6. Limiting mechanism; 61. Connecting plate ;62. Fixed frame;63. Protective ring;64. Slide;65. Extrusion wheel;66. Slide rod;67. U-shaped plate;68. Guide rod;69. Spring 1;7. Anti-twisting mechanism;71. Lifting ring;72. Fastening ring;73. Moving wheel;74. Support rope;75. Connecting frame;76. L-shaped plate;77. Active telescopic rod;78. T-shaped stage;79. Slide;710. Connecting plate;711. Moving rod;712. Rack;713. Gear;714. Straight groove;715. Protective plate;716. Shaft;717. Ring;718. Fixed plate;719. Strong tension spring;8. Counterweight. DETAILED DESCRIPTION

[0018] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] Example 1: Please refer to Figure 1-11 As shown, the present invention provides a technical solution: The present invention is an automatic anti-twisting device for a gantry crane hoist, comprising a hoisting cross plate 2 and two lifting seats 1 arranged on the hoisting cross plate 2, balance ropes 4 are arranged on both sides of the hoisting cross plate 2, two anti-twisting mechanisms 7 are arranged on the hoisting cross plate 2, through the two balance ropes 4, one balance rope 4 is tightened and the other balance rope 4 is relaxed, so as to prevent the hoisting cross plate 2 from twisting, a tensioning rope 5 is arranged on the hoisting cross plate 2, a limiting mechanism 6 for tightening the hoisting cross plate 2 is arranged on the hoisting cross plate 2, a main control mechanism 3 for detecting the twisting of the hoisting cross plate 2 and driving the balance rope 4 and the tensioning rope 5 to retract and release is arranged on the top of the hoisting cross plate 2, the two balance ropes 4 and the tensioning rope 5 are made of steel ropes, which are wear-resistant, and a sling is arranged at the bottom of the hoisting cross plate 2 for lifting goods.

[0021] The limiting mechanism 6 includes a fixing frame 62 arranged on the hanging horizontal plate 2, a connecting plate 61 is provided on the top of the fixing frame 62, and an extrusion wheel 65 is movably provided inside the fixing frame 62. The tensioning rope 5 is connected to the top of the hanging horizontal plate 2 through the extrusion wheel 65, and a protective ring 63 is provided between the end of the tensioning rope 5 and the hanging horizontal plate 2. When the tensioning rope 5 becomes longer or shorter, it will be squeezed by the extrusion wheel 65, so that it is always in a taut state, so that the subsequent detection of twisting conditions can be more accurate.

[0022] A slide groove 64 is provided on the inner side of the fixing frame 62. A slide rod 66 movably connected to the inner side of the slide groove 64 is provided at the end of the extrusion wheel 65. A U-shaped plate 67 is sleeved on the outer side of the slide rod 66. A guide rod 68 passing through the fixing frame 62 is provided on the side of the U-shaped plate 67. A spring 69 connected to the inner wall of the fixing frame 62 is sleeved on the outer side of the guide rod 68. A spring 69 can be used to push the extrusion wheel 65 to extrude the tension rope 5, and a slide groove 64 is also provided, in which a slide rod 66 connected to the extrusion wheel 65 is provided. The spring 69 can eliminate a certain stress of the tension rope 5 to prevent it from being in a highly tense state all the time, thereby increasing the risk of the tension rope 5 breaking.

[0023] Example 2: Please refer to Figure 3-6As shown, the present invention provides a technical solution, the anti-twisting mechanism 7 includes a connecting frame 75 arranged on the side of the connecting plate 61, and a moving wheel 73 connected to the balance rope 4 is movably provided on the inner side of the connecting frame 75. A lifting ring 71 is provided on the top of the hanging horizontal plate 2, and a support rope 74 is provided on the inner wall of the lifting ring 71. A fastening ring 72 is provided on the outer side of the support rope 74, and a connecting plate 710 is provided between the top of the support rope 74 and the bottom end of the balance rope 4. Lifting rings 71 and support ropes 74 are provided at the four corners of the hanging horizontal plate 2, and the support rope 74 is installed in the lifting ring 71 through a fastening ring 72 with a bolt, so that the two balance ropes 4 can control the movement of the hanging horizontal plate 2.

[0024] An axle rod 716 is provided at the end of the moving wheel 73, and a ring 717 is provided on the outer side of the axle rod 716. A fixing plate 718 is provided on the inner side of the connecting frame 75. A strong tension spring 719 is provided between the fixing plate 718 and the ring 717. A protective plate 715 that is in movable contact with the balance rope 4 is provided on the inner side of the connecting frame 75.

[0025] A movable rod 711 is rotatably provided at the end of the shaft 716. A straight slot 714 is provided on the side of the connecting frame 75 and is movably connected to the movable rod 711. A rack 712 is provided on the side of the connecting frame 75. A gear 713 is sleeved on the outer side of the movable rod 711 and meshes with the rack 712. By pulling the balance rope 4, the moving wheel 73 will slide in the connecting frame 75. Since the shaft 716 will slide when the moving wheel 73 slides, the strong tension spring 719 will continue to deform and have a reset function. The set moving rod 711 will move. The outer surface of the moving rod 711 is provided with a gear 713, and the gear 713 and the rack 712 are engaged. Therefore, the moving rod 711 will also rotate when it moves.

[0026] An L-shaped plate 76 is sleeved on the outside of the moving rod 711, and an active telescopic rod 77 is provided at the bottom of the L-shaped plate 76. A T-shaped platform 78 is provided on the top of the hanging horizontal plate 2. A slide 79 connected to the end of the active telescopic rod 77 is movably provided on the outside of the T-shaped platform 78. A multi-layer counterweight 8 is provided on the top of the slide 79. The rotation of the moving rod 711 will drive the L-shaped plate 76 to rotate. Since the active telescopic rod 77 is provided on the L-shaped plate 76, the counterweight 8 will be moved and suspended on the outside of the top of the hanging horizontal plate 2 through the slide 79. The active telescopic rod 77 will automatically extend when there is no squeezing force.

[0027] Example 3: Please refer to Figure 8-11As shown, the present invention provides a technical solution. The main control mechanism 3 includes a mounting plate 31 movably arranged between the two lifting seats 1. Two hydraulic rods 32 are provided on the top of the mounting plate 31. A plurality of slots are provided on the top of the mounting plate 31. A winch 1 33 connected to the balance rope 4 is provided on the top of the mounting plate 31. A winch 2 34 connected to the tension rope 5 is also provided on the top of the mounting plate 31. The balance rope 4 and the tension rope 5 both movably pass through the slots and cooperate with the balance rope 4 and the tension rope 5 respectively through the winch 1 33 and the winch 2 34, thereby achieving an anti-twisting effect.

[0028] A torsion detection assembly 35 is provided on the top of the mounting plate 31, which is used to detect the torsion of the hanging cross plate 2 through the tension rope 5. The torsion detection assembly 35 includes two side plates 357 arranged on the top of the mounting plate 31, a protective shell 351 is provided on the top of the mounting plate 31, and a resistance rod 356 is provided between the two side plates 357. An L-shaped groove 352 is provided on the inner side of the mounting plate 31, and a connecting ring 353 is provided on the outer side of the tension rope 5. A driven telescopic rod 354 connected to the inner side of the L-shaped groove 352 is provided on the outer side of the connecting ring 353, and a slide plate 355 is provided on the side of the driven telescopic rod 354 and is sleeved on the outer side of the resistance rod 356.

[0029] A spring 358 is provided between the slide plate 355 and the side plate 357. A limit slot 3513 is provided on the outer side of the resistor rod 356. A limit block 3514 is provided on the inner side of the slide plate 355 and is movably connected to the limit slot 3513. A top plate 3511 is provided on the side of the slide plate 355. An electrical contact 3512 is provided at the bottom of the top plate 3511 and contacts the resistor rod 356. A current detection unit 359 is provided on the side of the side plate 357 and is connected to the end of the resistor rod 356. An electrical wire 3510 is provided between the current detection unit 359 and the electrical contact 3512. When twisting occurs, the connecting ring 353 will move together with the tension rope 5. Since its movement trajectory will continue to change irregularly, the driven telescopic rod 354 and the slide plate 355 are set to slide on the resistance rod 356 to achieve a three-dimensional limiting effect. In this way, the electric contact head 3512 transmits the current to the current detection unit 359 through the resistance rod 356, so that the twisting situation can be judged, thereby controlling the two balance ropes 4 to perform anti-twisting work.

[0030] Working principle: When using this device, first, the lifting seat 1 drives the hanging cross plate 2 to descend. At this time, the winch 1 33 and the winch 2 34 will drive the balance rope 4 and the tension rope 5 to descend respectively to cooperate with the hanging cross plate 2. The mounting plate 31 will be lifted and lowered by the hydraulic rod 32. When the hanging horizontal plate 2 is twisted, the tension rope 5 is always in a taut state, so the tension rope 5 will first squeeze the extrusion wheel 65, and make the slide bar 66 at the end of the extrusion wheel 65 slide in the slide groove 64, and the U-shaped plate 67 will drive the guide rod 68 to squeeze the spring 1 69, so that the spring 1 69 can reset the extrusion wheel 65. At this time, the tension rope 5 is initially in a shorter state. Due to its own twisting, it becomes extended to a certain extent when the extrusion wheel 65 is retracted. The connecting ring 353 sleeved on the outside of the tension rope 5 will move, and when the connecting ring 353 moves, it will drive the driven telescopic rod 354 to move. The driven telescopic rod 354 moves back, and the slide plate 355 moves in the L-shaped groove 352. The slide plate 355 slides on the outside of the resistance rod 356, and the slide plate 355 also drives the electrical contact 3512 to slide on the outer surface of the resistance rod 356. The current detection unit 359 continues to transmit electricity to the electrical contact 3512 through the wire 3510, so the current will return to the current detection unit 359 again through the resistance rod 356. Then, by calculating the current of the slide plate 355 in the equilibrium state and the current difference when the tension rope 5 is twisted, the twisting of the tension rope 5 and the suspension cross plate 2 can be quickly obtained. When the current detection unit 359 receives the data, it controls the balance ropes 4 through the two winches 33 on the top of the mounting plate 31. One balance rope 4 starts to tighten, while the other balance rope 4 starts to loosen. At this time, the connecting disk 710 at the bottom of the balance rope 4 moves, and the connecting disk 710 drives the support rope 74 to be in a tightened or loosened state. When the taut balance rope 4 is located, the moving wheel 73 will be driven to slide in the connecting frame 75, so the moving wheel 73 will drive the shaft 716 to move, and the shaft 716 will be limited under the action of the ring 717 and the strong tension spring 719, and the strong tension spring 719 has a reset function. When the shaft 716 moves, it will drive the moving rod 711 to slide inside the straight groove 714. The outer surface of the moving rod 711 is provided with a gear 713, and the outer side of the gear 713 is meshed with a rack 712. Therefore, when the moving rod 711 moves, it will also rotate. When the moving rod 711 rotates, it will drive the active telescopic rod 77 to move. The active telescopic rod 77 will drive the slide 79 to slide on the outer surface of the T-shaped stage 78, so the slide 79 will drive the multi-layer counterweight block 8 to move to the outside of the top of the hanging cross plate 2, so that the tension on the side increases the weight, thereby reducing the torsion. On the contrary, the same is true when the balancing rope 4 on the other side is tensioned.

[0031] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the invention as claimed.

Claims

1. An automatic anti-twist device for a gantry crane hoist, comprising a hoisting transverse plate (2) and two lifting seats (1) arranged on the hoisting transverse plate (2), characterized in that: Balance ropes (4) are provided on both sides of the hanging cross plate (2), and two anti-twisting mechanisms (7) are provided on the hanging cross plate (2). The two balance ropes (4) are used to prevent the hanging cross plate (2) from twisting, one of the balance ropes (4) is tightened, and the other balance rope (4) is loosened. A tension rope (5) is provided on the hanging cross plate (2), and a limiting mechanism (6) for tightening the hanging cross plate (2) is provided on the hanging cross plate (2). A main control mechanism (3) for detecting the twisting of the hanging cross plate (2) and driving the balance rope (4) and the tension rope (5) to be retracted and released is provided on the top of the hanging cross plate (2).

2. The automatic anti-twist device for gantry crane spreader according to claim 1, characterized in that: The limiting mechanism (6) includes a fixing frame (62) arranged on the hanging horizontal plate (2), a connecting plate (61) is provided on the top of the fixing frame (62), an extrusion wheel (65) is movably provided inside the fixing frame (62), the tension rope (5) is connected to the top of the hanging horizontal plate (2) through the extrusion wheel (65), and a protective ring (63) is provided between the end of the tension rope (5) and the hanging horizontal plate (2).

3. The automatic anti-twist device for portal crane spreader according to claim 2, characterized in that: A slide groove (64) is provided on the inner side of the fixing frame (62), and a slide rod (66) movably connected to the inside of the slide groove (64) is provided at the end of the extrusion wheel (65), and a U-shaped plate (67) is sleeved on the outer side of the slide rod (66), and a guide rod (68) passing through the fixing frame (62) is provided on the side of the U-shaped plate (67), and a spring (69) connected to the inner wall of the fixing frame (62) is sleeved on the outer side of the guide rod (68).

4. The automatic anti-twist device for portal crane spreader according to claim 1, characterized in that: The anti-twist mechanism (7) includes a connecting frame (75) arranged on the side of the connecting plate (61), a movable wheel (73) connected to the balance rope (4) is movably arranged on the inner side of the connecting frame (75), a lifting ring (71) is arranged on the top of the hanging horizontal plate (2), a support rope (74) is sleeved on the inner wall of the lifting ring (71), a fastening ring (72) is arranged on the outer side of the support rope (74), and a connecting plate (710) is arranged between the top end of the support rope (74) and the bottom end of the balance rope (4).

5. The automatic anti-twist device for portal crane spreader according to claim 4, characterized in that: The end of the moving wheel (73) is provided with a shaft (716), the outer side of the shaft (716) is movably sleeved with a collar (717), the inner side of the connecting frame (75) is provided with a fixing plate (718), a strong tension spring (719) is provided between the fixing plate (718) and the collar (717), and the inner side of the connecting frame (75) is provided with a protective plate (715) that is in movably contact with the balance rope (4).

6. The automatic anti-twist device for portal crane spreader according to claim 5, characterized in that: A movable rod (711) is rotatably provided at the end of the shaft (716), a straight groove (714) movably connected to the movable rod (711) is provided on the side of the connecting frame (75), a rack (712) is provided on the side of the connecting frame (75), and a gear (713) meshing with the rack (712) is sleeved on the outer side of the movable rod (711).

7. The automatic anti-twist device for portal crane spreader according to claim 6, characterized in that: The outer side of the movable rod (711) is provided with an L-shaped plate (76), the bottom of the L-shaped plate (76) is provided with an active telescopic rod (77), the top of the suspended horizontal plate (2) is provided with a T-shaped platform (78), the outer side of the T-shaped platform (78) is provided with a sliding platform (79) connected to the end of the active telescopic rod (77), and the top of the sliding platform (79) is provided with a multi-layer counterweight block (8).

8. The automatic anti-twist device for portal crane spreader according to claim 1, characterized in that: The main control mechanism (3) includes a mounting plate (31) movably arranged between two lifting seats (1), two hydraulic rods (32) are arranged on the top of the mounting plate (31), a plurality of slots are arranged on the top of the mounting plate (31), a winch 1 (33) connected to and wound around a balancing rope (4) is arranged on the top of the mounting plate (31), and a winch 2 (34) connected to and wound around a tension rope (5) is also arranged on the top of the mounting plate (31), and both the balancing rope (4) and the tension rope (5) are movably passed through the slots.

9. The automatic anti-twist device for portal crane spreader according to claim 8, characterized in that: A torsion detection assembly (35) is provided on the top of the mounting plate (31) for detecting the torsion of the suspended horizontal plate (2) through the tension rope (5). The torsion detection assembly (35) includes two side plates (357) provided on the top of the mounting plate (31). A protective shell (351) is provided on the top of the mounting plate (31). A resistance rod (356) is provided between the two side plates (357). An L-shaped groove (352) is provided on the inner side of the mounting plate (31). A connecting ring (353) is provided on the outer side of the tension rope (5). A driven telescopic rod (354) connected to the inner side of the L-shaped groove (352) is provided on the outer side of the connecting ring (353). A slide plate (355) is provided on the side of the driven telescopic rod (354) and is sleeved on the outer side of the resistance rod (356).

10. The automatic anti-twist device for portal crane spreader according to claim 9, characterized in that: A second spring (358) is provided between the slide plate (355) and the side plate (357); a limiting groove (3513) is provided on the outer side of the resistance rod (356); a limiting block (3514) movably connected to the limiting groove (3513) is provided on the inner side of the slide plate (355); a top plate (3511) is provided on the side of the slide plate (355); an electrical contact (3512) in contact with the resistance rod (356) is provided at the bottom of the top plate (3511); a current detection unit (359) connected to the end of the resistance rod (356) is provided on the side of the side plate (357); and an electric wire (3510) is provided between the current detection unit (359) and the electrical contact (3512).

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