Portal crane sling automatic anti-twist device

Abstract

The application belongs to the technical field of cranes, and particularly discloses a portal crane sling automatic anti-twist device, which comprises a hoisting horizontal plate, two lifting seats arranged on the hoisting horizontal plate, balance ropes arranged on both sides of the hoisting horizontal plate, two anti-twist mechanisms arranged on the hoisting horizontal plate, and a tightening rope arranged on the hoisting horizontal plate. When the hoisting horizontal plate is twisted, one of the balance ropes is tightened and the other is loosened, so that the hoisting horizontal plate is prevented from being twisted. The hoisting horizontal plate is provided with a limiting mechanism for tightening the hoisting horizontal plate. The anti-twist device adopts a double-balance-rope cooperative working mode, two balance ropes are connected with the same winch, one of the balance ropes is rapidly tightened, the generated constraint force accurately limits the twisting tendency of the sling, the sling posture is stabilized like an anchor point, and the other balance rope is correspondingly loosened to leave a buffer space for the displacement of the sling caused by inertia.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cranes, and particularly discloses an automatic anti-twist device for a spreader of a portal crane. BACKGROUND

[0002] The portal crane is commonly used in places such as ports, and large equipment and spreaders are flexibly connected through steel wire ropes. When the spreader runs or rotates, the goods will sway due to inertia or movement, and the steel wire ropes will twist. In order to ensure the stability of the spreader and the goods during running and the rotation of the spreader, ensure that the whole spreader is parallel to the port wharf or the horizontal transport vehicle, and improve the regularity of the loading and unloading position and the operation efficiency.

[0003] At present, in the anti-twist technology of the spreader of the portal crane, some devices adopt a method of connecting the spreader and the main body of the crane through a pull rope. This method utilizes the restraint effect of the pull rope to limit the sway amplitude and the twisting trend of the spreader to a certain extent, and can alleviate the instability problem during light load or low speed operation. However, due to the flexible characteristics and fixed connection mode of the pull rope, the restraint effect is greatly reduced when heavy load hoisting, high speed running or complex working conditions are faced.

[0004] Another type of anti-twist device integrates a dynamic pull rope system on the spreader. When the spreader is detected to twist, the pull rope and the spreader are linked to trigger a tightening mechanism, and a reverse restraint force is quickly applied to correct the twist angle. Compared with the traditional fixed pull rope, this scheme realizes dynamic response and is more timely in controlling the sudden twist. However, in actual application, this type of device still has limitations: the response speed and tightening degree of the pull rope are difficult to accurately match different hoisting conditions, which may cause damage to the spreader due to over-tightening, or the response lag may not completely eliminate the twist. Therefore, we propose an automatic anti-twist device for the spreader of the portal crane to solve the problem of anti-twist. SUMMARY

[0005] Therefore, the purpose of the present application is to provide an automatic anti-twist device for the spreader of the portal crane to solve the above problems.

[0006] To achieve the above purpose, the present application provides an automatic anti-twist device for the spreader of the portal crane, which comprises a hoisting horizontal plate and two lifting seats arranged on the hoisting horizontal plate. Both sides of the hoisting horizontal plate are provided with balance ropes. Two anti-twist mechanisms are arranged on the hoisting horizontal plate. The hoisting horizontal plate is prevented from twisting by two balance ropes. One of the balance ropes is tightened, and the other balance rope is loosened. A tight rope is arranged on the hoisting horizontal plate. A limiting mechanism for tightening the hoisting horizontal plate is arranged on the hoisting horizontal plate. A main control mechanism for detecting the twisting of the hoisting horizontal plate and driving the balance rope and the tight rope to be collected and released is arranged on the top of the hoisting horizontal plate.

[0007] Further, the limiting mechanism comprises a fixing frame arranged on the hanging horizontal plate, a connecting plate is arranged on the top of the fixing frame, an extrusion wheel is movably arranged in the fixing frame, the tight rope is connected to the top of the hanging horizontal plate through the extrusion wheel, and a protection ring is arranged between the end of the tight rope and the hanging horizontal plate.

[0008] Further, a sliding groove is arranged on the inner side of the fixing frame, a sliding rod is movably arranged in the sliding groove at the end of the extrusion wheel, a U-shaped plate is arranged on the outer side of the sliding rod, a guide rod penetrating through the fixing frame is arranged on the side of the U-shaped plate, a spring I connected with the inner wall of the fixing frame is arranged on the outer side of the guide rod.

[0009] Further, the anti-twisting mechanism comprises a connecting frame arranged on the side of the connecting plate, a moving wheel connected with the balance rope is movably arranged in the connecting frame, a lifting ring is arranged on the top of the hanging horizontal plate, a supporting rope is arranged in the inner wall of the lifting ring, a fastening ring is arranged on the outer side of the supporting rope, and a connecting disc is arranged between the top end of the supporting rope and the bottom end of the balance rope.

[0010] Further, an axle rod is arranged at the end of the moving wheel, a sleeve ring is movably arranged on the outer side of the axle rod, a fixing plate is arranged on the inner side of the connecting frame, a strong tension spring is arranged between the fixing plate and the sleeve ring, and a protection plate movably contacting with the balance rope is arranged on the inner side of the connecting frame.

[0011] Further, a moving rod is rotatably arranged at the end of the axle rod, a straight groove movably connected with the moving rod is arranged on the side of the connecting frame, a rack is arranged on the side of the connecting frame, and a gear meshing with the rack is arranged on the outer side of the moving rod.

[0012] Further, an L-shaped plate is arranged on the outer side of the moving rod, a main driven telescopic rod is arranged on the bottom of the L-shaped plate, a T-shaped table is movably arranged on the top of the hanging horizontal plate, a sliding table connected with the end of the main driven telescopic rod is movably arranged on the outer side of the T-shaped table, and a plurality of counterweights are arranged on the top of the sliding table.

[0013] Further, the main control mechanism comprises an installation plate movably arranged between the two lifting seats, two hydraulic rods are arranged on the top of the installation plate, a plurality of grooves are arranged on the top of the installation plate, a winch I connected with the winding of the balance rope is arranged on the top of the installation plate, a winch II connected with the winding of the tight rope is arranged on the top of the installation plate, and the balance rope and the tight rope movably pass through the grooves.

[0014] Further, the top of the mounting plate is provided with a twist detection assembly for detecting the twist of the hanging plate through the tight rope, the twist detection assembly comprises two side plates arranged on the top of the mounting plate, the top of the mounting plate is provided with a protective shell, a resistance rod is arranged between the two side plates, an L-shaped slot is formed in the inner side of the mounting plate, a connecting ring is arranged on the outer side of the tight rope, a driven telescopic rod is arranged on the outer side of the connecting ring and connected with the inner side of the L-shaped slot, and a sliding plate is arranged on the outer side of the driven telescopic rod.

[0015] Further, a spring two is arranged between the sliding plate and the side plate, a limiting groove is formed in the outer side of the resistance rod, a limiting block movably connected with the limiting groove is arranged on the inner side of the sliding plate, a top plate is arranged on the side edge of the sliding plate, an electric contact head in contact with the resistance rod is arranged on the bottom of the top plate, an electric current detection unit connected with the end of the resistance rod is arranged on the side edge of the side plate, and an electric wire is arranged between the electric current detection unit and the electric contact head.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1. The anti-twist device adopts a double-balance-rope cooperative working mode, two balance ropes are respectively connected with the same winch, when the lifting appliance twists, the two balance ropes present differential tension changes: one balance rope is quickly tightened, the constraint force generated thereby accurately limits the twisting trend of the lifting appliance, and the lifting appliance posture is stabilized like an anchor point, and the other balance rope is correspondingly loosened, thereby leaving a buffer space for the displacement of the lifting appliance due to inertia, so that the lifting appliance is prevented from excessively deviating, through the dynamic adjustment mechanism that the two balance ropes are tight and loose in a proper degree, the twisting stress is effectively resolved, efficient anti-twist control of the lifting appliance is realized, and the stability and safety of the lifting operation are ensured.

[0018] 2. In the descending process of the lifting appliance, the limiting mechanism continuously acts on the tight rope, so that the tight rope always maintains a tension state, when the lifting appliance twists, the tight rope moves, so as to be captured by the electric current detection unit and converted into an electric signal, the electric current detection unit can quickly and accurately judge the twisting condition of the lifting appliance, and provide a reliable basis for the start of the subsequent anti-twist measures, so that the lifting operation is safely and stably carried out.

[0019] 3. A counterweight is installed at the top center position of the lifting appliance, in a normal state, the counterweight remains in the center, so as to ensure the stability of the center of gravity of the lifting appliance, when the lifting appliance appears a twisting trend, the anti-twist mechanism quickly responds, drives the balance rope to move the counterweight to the outer side of the lifting appliance, by changing the position of the counterweight, the center of gravity of the lifting appliance deviates to generate a reverse torque, the twisting force is effectively offset, and the swinging amplitude of the lifting appliance is significantly reduced, so as to ensure the dynamic balance and stability in the lifting operation process. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1Structure diagram of the present application;

[0021] Figure 2 Structure diagram of the present application in which the horizontal plate, lifting seat, counterweight and anti-twist mechanism are installed;

[0022] Figure 3 Structure diagram of the present application in which the anti-twist mechanism, counterweight and limiting mechanism are installed;

[0023] Figure 4 Structure diagram of the present application in which the anti-twist mechanism and counterweight are installed;

[0024] Figure 5 Structure diagram of the present application in which the L-shaped plate, connecting frame and moving wheel are installed;

[0025] Figure 6 Structure diagram of the present application in which the shaft, L-shaped plate, sleeve ring and fixing plate are installed;

[0026] Figure 7 Structure diagram of the present application in which the limiting mechanism and tight rope are installed;

[0027] Figure 8 Structure diagram of the present application in which the main control mechanism is installed;

[0028] Figure 9 Structure diagram of the present application in which the installation plate is installed;

[0029] Figure 10 Structure diagram of the present application in which the installation plate is installed; Figure 9 Structure diagram of the present application in which the installation plate is installed; Structure diagram of the present application in which the installation plate is installed;

[0030] Structure diagram of the present application in which the installation plate is installed; Figure 11 Structure diagram of the present application in which the installation plate is installed.

[0031] Reference signs:

[0032] 1, lifting seat; 2, hanging horizontal plate; 3, main control mechanism; 31, mounting plate; 32, hydraulic rod; 33, winch 1; 34, winch 2; 35, twist detection assembly; 351, protective shell; 352, L-shaped groove; 353, connecting ring; 354, driven telescopic rod; 355, sliding plate; 356, resistance rod; 357, side plate; 358, spring 2; 359, current detection unit; 3510, wire; 3511, top plate; 3512, electrical contact head; 3513, limiting groove; 3514, limiting block; 4, balance rope; 5, tight rope; 6, limiting mechanism; 61, connecting plate; 62, fixed frame; 63, protective ring; 64, sliding groove; 65, extrusion wheel; 66, sliding rod; 67, U-shaped plate; 68, guide rod; 69, spring 1; 7, anti-twist mechanism; 71, lifting ring; 72, fastening ring; 73, moving wheel; 74, rope support; 75, connecting frame; 76, L-shaped plate; 77, driven telescopic rod; 78, T-shaped table; 79, sliding table; 710, connecting disc; 711, moving rod; 712, rack; 713, gear; 714, straight groove; 715, protective plate; 716, shaft; 717, sleeve ring; 718, fixed plate; 719, strong tension spring; 8, counterweight. DETAILED DESCRIPTION

[0033] In order to enable more clear understanding of the above-mentioned objects, features and advantages of the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the present application is not limited to the specific embodiments disclosed below.

[0035] Example one: please refer to Figures 1-11 The present application provides a technical solution as shown in the figure:

[0036] The present application is a kind of portal crane sling automatic anti-twist device, including hanging horizontal plate 2 and two lifting seats 1 arranged on hanging horizontal plate 2, the two sides of hanging horizontal plate 2 are provided with balance rope 4, two anti-twist mechanisms 7 are arranged on hanging horizontal plate 2, one of the two balance ropes 4 is tightened, the other balance rope 4 is loosened, to avoid the twist of hanging horizontal plate 2, tight rope 5 is arranged on hanging horizontal plate 2, limiting mechanism 6 is arranged on hanging horizontal plate 2 to tighten hanging horizontal plate 2, the top of hanging horizontal plate 2 is provided with main control mechanism 3 for detecting the twist of hanging horizontal plate 2 and driving the winding and unwinding of balance rope 4 and tight rope 5, the material of the two balance ropes 4 and tight rope 5 is steel rope, which has the effect of wear resistance, the bottom of hanging horizontal plate 2 is provided with a sling for hoisting goods.

[0037] The limiting mechanism 6 comprises a fixing frame 62 arranged on the hanging horizontal plate 2, the top of the fixing frame 62 is provided with a connecting plate 61, the inside of the fixing frame 62 is movably provided with an extrusion wheel 65, the tight rope 5 is connected to the top of the hanging horizontal plate 2 through the extrusion wheel 65, and a protection ring 63 is arranged between the end of the tight rope 5 and the hanging horizontal plate 2, when the tight rope 5 is lengthened or shortened, the tight rope 5 is extruded by the extrusion wheel 65, so that the tight rope 5 is always in a tight state, and thus the detection of the twisting condition can be more accurate.

[0038] The inside of the fixing frame 62 is provided with a sliding groove 64, the end of the extrusion wheel 65 is provided with a sliding rod 66 movably connected in the sliding groove 64, the outside of the sliding rod 66 is sleeved with a U-shaped plate 67, the side of the U-shaped plate 67 is provided with a guide rod 68 penetrating through the fixing frame 62, and the outside of the guide rod 68 is sleeved with a spring 69 connected with the inner wall of the fixing frame 62.

[0039] The spring 69 can push the extrusion wheel 65 to extrude the tight rope 5, and the sliding groove 64 is also arranged, the sliding groove 64 is provided with the sliding rod 66 connected with the extrusion wheel 65, and the spring 69 can eliminate the stress of the tight rope 5, so that the tight rope 5 is not always in a large tight state, thereby increasing the risk of breaking of the tight rope 5.

[0040] Embodiment two: please refer to Figures 3-6 As shown in the figure, the present application provides a technical scheme, the anti-twisting mechanism 7 comprises a connecting frame 75 arranged on the side of the connecting plate 61, the inside of the connecting frame 75 is movably provided with a moving wheel 73 connected with the balance rope 4, the top of the hanging horizontal plate 2 is provided with a lifting ring 71, the inner wall of the lifting ring 71 is sleeved with a supporting rope 74, the outside of the supporting rope 74 is provided with a fastening ring 72, and the top end of the supporting rope 74 and the bottom end of the balance rope 4 are provided with a connecting disc 710, the lifting ring 71 and the supporting rope 74 are arranged at the four corners of the hanging horizontal plate 2, and the supporting rope 74 is installed in the lifting ring 71 through the fastening ring 72 with a bolt, so that the two balance ropes 4 can control the movement of the hanging horizontal plate 2.

[0041] The end of the moving wheel 73 is provided with a shaft rod 716, the outside of the shaft rod 716 is movably sleeved with a sleeve ring 717, the inside of the connecting frame 75 is provided with a fixed plate 718, the fixed plate 718 and the sleeve ring 717 are provided with a strong tension spring 719, and the inside of the connecting frame 75 is provided with a protection plate 715 movably contacted with the balance rope 4.

[0042] The end of the shaft rod 716 is rotatably provided with a moving rod 711, the side of the connecting frame 75 is provided with a straight groove 714 movably connected with the moving rod 711, the side of the connecting frame 75 is provided with a rack 712, and the outside of the moving rod 711 is sleeved with a gear 713 meshed with the rack 712.

[0043] By pulling the balance rope 4, the moving wheel 73 will slide in the connecting frame 75, and since the shaft rod 716 will slide when the moving wheel 73 slides, the strong tension spring 719 will continue to deform, and has a reset function, the moving rod 711 arranged will move, the outer surface of the moving rod 711 is sleeved with a gear 713, and the gear 713 and the rack 712 are engaged, so that the moving rod 711 also rotates when moving.

[0044] The outer side of the moving rod 711 is sleeved with an L-shaped plate 76, the bottom of the L-shaped plate 76 is provided with a main telescopic rod 77, the top of the hanging horizontal plate 2 is provided with a T-shaped table 78, the outer side of the T-shaped table 78 is movably provided with a sliding table 79 connected with the end of the main telescopic rod 77, and the top of the sliding table 79 is provided with a plurality of weight blocks 8. Through the rotation of the moving rod 711, the L-shaped plate 76 is rotated, and since the L-shaped plate 76 is provided with the main telescopic rod 77, the weight blocks 8 are moved and hung outside the top of the hanging horizontal plate 2 through the sliding table 79. The main telescopic rod 77 will automatically extend when there is no extrusion force.

[0045] Embodiment three: please refer to Figures 8-11 As shown in the figure, the application provides a technical scheme, the master control mechanism 3 includes an installation plate 31 movably arranged between the two lifting seats 1, the top of the installation plate 31 is provided with two hydraulic rods 32, the top of the installation plate 31 is provided with a plurality of slots, the top of the installation plate 31 is provided with a winch one 33 connected with the balance rope 4, and the top of the installation plate 31 is also provided with a winch two 34 connected with the tight rope 5, the balance rope 4 and the tight rope 5 are movably arranged through the slots, and the winch one 33 and the winch two 34 are matched with the balance rope 4 and the tight rope 5 respectively, so that the anti-twisting effect is achieved.

[0046] The top of the installation plate 31 is provided with a twist detection assembly 35 for detecting the twist of the hanging horizontal plate 2 through the tight rope 5, the twist detection assembly 35 includes two side plates 357 arranged on the top of the installation plate 31, the top of the installation plate 31 is provided with a protective shell 351, an electric resistance rod 356 is arranged between the two side plates 357, an L-shaped groove 352 is formed in the inner side of the installation plate 31, a connecting ring 353 is sleeved on the outer side of the tight rope 5, the outer side of the connecting ring 353 is provided with a driven telescopic rod 354 connected with the inner side of the L-shaped groove 352, and the side of the driven telescopic rod 354 is provided with a sliding plate 355 sleeved on the outer side of the electric resistance rod 356.

[0047] The spring 358 is arranged between the slide plate 355 and the side plate 357, the outer side of the electric resistance rod 356 is provided with a limiting groove 3513, the inner side of the slide plate 355 is provided with a limiting block 3514 movably connected with the limiting groove 3513, the side edge of the slide plate 355 is provided with a top plate 3511, the bottom of the top plate 3511 is provided with an electric contact head 3512 in contact with the electric resistance rod 356, the side edge of the side plate 357 is provided with a current detection unit 359 connected with the end of the electric resistance rod 356, and the current detection unit 359 and the electric contact head 3512 are provided with an electric wire 3510 therebetween;

[0048] When the twist occurs, the connecting ring 353 moves together with the tight rope 5, and the movement track is irregular and continues to change, so the driven telescopic rod 354 and the slide plate 355 are arranged to slide on the electric resistance rod 356, and the three-dimensional limiting effect is achieved, so that the electric current transmitted to the current detection unit 359 through the electric resistance rod 356 by the electric contact head 3512 can be determined, and the twist condition can be determined, so that the two balance ropes 4 can be controlled to prevent the twist.

[0049] Working principle: when the device is used, the lifting seat 1 drives the hanging horizontal plate 2 to descend, at this time, the winch 1 and the winch 2 33 and 34 respectively drive the balance rope 4 and the tight rope 5 to descend to cooperate with the hanging horizontal plate 2, and the mounting plate 31 is lifted and descended under the action of the hydraulic rod 32;

[0050] When the hanging horizontal plate 2 is twisted, the tight rope 5 is always in a tight state at this time, so the tight rope 5 first extrudes the extrusion wheel 65, and the slide rod 66 at the end of the extrusion wheel 65 slides in the sliding groove 64, and the U-shaped plate 67 drives the guide rod 68 to extrude the spring 1 69, so that the spring 1 69 can reset the extrusion wheel 65, at this time, the tight rope 5 is initially in a shorter state, and due to the twist, the tight rope 5 is in a state of being retracted, and the connecting ring 353 sleeved outside the tight rope 5 moves, the connecting ring 353 moves and drives the driven telescopic rod 354 to move, the driven telescopic rod 354 returns, the slide plate 355 moves in the L-shaped groove 352, the slide plate 355 slides on the outer side of the electric resistance rod 356, and the slide plate 355 also drives the electric contact head 3512 to slide on the outer surface of the electric resistance rod 356, the current detection unit 359 always transmits electricity to the electric contact head 3512 through the electric wire 3510, so the current passes through the electric resistance rod 356 and returns to the current detection unit 359 again, and then the current in the balanced state of the slide plate 355 and the current difference when the tight rope 5 is twisted are calculated, so the twist condition of the tight rope 5 and the hanging horizontal plate 2 can be quickly obtained;

[0051] When the current detection unit 359 gets the data, it will control the two balance ropes 4 through the two winches 33 on the top of the installation plate 31, one balance rope 4 starts to tighten, and the other balance rope 4 starts to loosen, at this time, the connecting disc 710 at the bottom end of the balance rope 4 moves, and the connecting disc 710 drives the branch rope 74 to be in a state of tension or relaxation;

[0052] At the balance rope 4 in tension, the moving wheel 73 slides in the connecting frame 75, so that the moving wheel 73 drives the shaft rod 716 to move, the shaft rod 716 is limited by the effect of the sleeve ring 717 and the strong tension spring 719, and the strong tension spring 719 has a reset effect, when the shaft rod 716 moves, it drives the moving rod 711 to slide in the straight groove 714, the outer surface of the moving rod 711 is sleeved with the gear 713, and the gear 713 is meshed with the rack 712 outside, so that when the moving rod 711 moves, it also rotates, when the moving rod 711 rotates, it drives the main driven telescopic rod 77 to move, the main driven telescopic rod 77 drives the sliding table 79 to slide on the outer surface of the T-shaped table 78, so that the sliding table 79 drives the multiple layers of counterweight blocks 8 to move to the top outside of the hanging horizontal plate 2, so that the side in tension is increased in weight, and the torsion is reduced, and vice versa.

[0053] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above embodiments, the above embodiments and descriptions in the specification are only the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. An automatic anti-twist device for a gantry crane lifting device, comprising a lifting cross plate and two lifting seats disposed on the lifting cross plate, characterized in that: The horizontal suspension plate is equipped with balance ropes on both sides. The horizontal suspension plate is equipped with two anti-twist mechanisms to prevent the horizontal suspension plate from twisting. One balance rope is taut and the other is slack. The horizontal suspension plate is equipped with a tension rope and a limiting mechanism to tighten the tension rope. The top of the horizontal suspension plate is equipped with a main control mechanism to detect the twisting of the horizontal suspension plate and drive the balance rope and tension rope to tighten and loosen. The limiting mechanism includes a fixed frame installed on the suspended horizontal plate, a connecting plate on the top of the fixed frame, a compression wheel movably installed inside the fixed frame, a tension rope connected to the top of the suspended horizontal plate through the compression wheel, and a protective ring installed between the end of the tension rope and the suspended horizontal plate. The anti-torsion mechanism includes a connecting frame disposed on the side of the connecting plate, a movable wheel connected to the balance rope is movably disposed on the inner side of the connecting frame, a lifting ring is disposed at the top of the suspended horizontal plate, a support rope is sleeved on the inner wall of the lifting ring, a fastening ring is disposed on the outer side of the support rope, and a connecting plate is disposed between the top end of the support rope and the bottom end of the balance rope. The end of the movable wheel is provided with an axle, and a collar is movably sleeved on the outside of the axle. A fixing plate is provided on the inside of the connecting frame, and a strong tension spring is provided between the fixing plate and the collar. A protective plate that is in movable contact with the balance rope is provided on the inside of the connecting frame. The end of the shaft is rotatably provided with a movable rod, the side of the connecting frame is provided with a straight groove that is movably connected to the movable rod, the side of the connecting frame is provided with a rack, and the outer side of the movable rod is fitted with a gear that meshes with the rack. An L-shaped plate is fitted on the outer side of the movable rod, and an active telescopic rod is provided at the bottom of the L-shaped plate. A T-shaped platform is provided at the top of the suspended horizontal plate, and a slide table connected to the end of the active telescopic rod is movably provided on the outer side of the T-shaped platform. Multiple counterweights are provided on the top of the slide table. By pulling the balance rope, the movable wheel will slide within the connecting frame.

2. The automatic anti-torsion device for a gantry crane lifting device according to claim 1, characterized in that, The inner side of the fixed frame is provided with a sliding groove, and the end of the extrusion wheel is provided with a sliding rod that is movably connected inside the sliding groove. A U-shaped plate is sleeved on the outer side of the sliding rod, and a guide rod that penetrates the fixed frame is provided on the side of the U-shaped plate. A spring connected to the inner wall of the fixed frame is sleeved on the outer side of the guide rod.

3. The automatic anti-torsion device for a gantry crane lifting device according to claim 1, characterized in that, The main control mechanism includes a mounting plate movably disposed between two lifting seats. Two hydraulic rods are provided on the top of the mounting plate. Multiple slots are provided on the top of the mounting plate. A winch one connected to a balance rope is provided on the top of the mounting plate. A winch two connected to a tension rope is also provided on the top of the mounting plate. Both the balance rope and the tension rope move through the slots.

4. The automatic anti-twist device for a gantry crane lifting device according to claim 3, characterized in that, The top of the mounting plate is equipped with a torsion detection component for detecting the torsion of the suspended horizontal plate through a tension rope. The torsion detection component includes two side plates on the top of the mounting plate, a protective shell on the top of the mounting plate, a resistance rod between the two side plates, an L-shaped groove on the inner side of the mounting plate, a connecting ring on the outer side of the tension rope, a driven telescopic rod connected to the inner side of the L-shaped groove on the outer side of the connecting ring, and a sliding plate on the side of the driven telescopic rod that is fitted on the outer side of the resistance rod.

5. The automatic anti-twist device for a gantry crane lifting device according to claim 4, characterized in that, A second spring is provided between the slide plate and the side plate. A limiting groove is provided on the outer side of the resistor rod. A limiting block is provided on the inner side of the slide plate and is movably connected to the limiting groove. A top plate is provided on the side of the slide plate. An electrical contact head is provided at the bottom of the top plate and contacts the resistor rod. A current detection unit is provided on the side of the side plate and is connected to the end of the resistor rod. A wire is provided between the current detection unit and the electrical contact head.

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