A lifting hook for mine construction tower crane

Abstract

The present invention relates to the field of lifting equipment, and specifically to a lifting hook for a mine construction tower crane, comprising a hook body and a connecting frame, wherein the hook body can be rotatably arranged, a rotation groove can be rotatably arranged on the hook body, arc-shaped locking gear rods are slidably inserted on both sides of the rotation groove, and an induction drive component is arranged in the connecting frame, and the induction drive component is connected to the hook body and the locking gear rod. The present invention is driven by the induction drive component, so that when the hook body lifts a heavy object, the locking gear rod rotates to form a closed loop with the hook body, and can automatically form a self-locking, avoiding unhooking during the lifting process, and when unloading the heavy object, the rotation of the hook body combined with the swing of the locking gear rod to the rope loop can automatically and quickly complete the unhooking, without the need for construction personnel to manually unhook, saving labor costs.

Description

Technical Field

[0001] The invention relates to the field of lifting equipment, and in particular to a lifting hook for a mine construction tower crane. Background Art

[0002] A tower crane, also known as a tower crane, is a rotating crane with a boom mounted on the top of a tall tower. It has a large operating space and is mainly used for vertical and horizontal transportation of materials and installation of mine components in mine construction. In order to facilitate the hanging of heavy objects, tower cranes usually need to be used with hooks. During the operation of a tower crane, the hook position may swing due to wind force, inertia and other reasons, which may cause it to become unhooked, causing safety hazards. At the same time, most of the hanging of goods needs to be done manually, which is inefficient.

[0003] The prior art uses a variety of methods to solve the above problems. For example, a Chinese patent document with application number 201911066771.X discloses a crane that uses the weight of an object to automatically lock and prevent it from falling off. The device is provided with a fixing groove on the bottom surface of an external shell. After hanging a heavy object, the weight of the heavy object is used to drive the external shell to move downward. The upward hook of the hook is engaged with the fixing groove on the bottom surface of the external shell to complete self-locking. However, the hook form of the device requires manual operation to unhook and the difficulty of unhooking is increased. For another example, a Chinese patent document with application number 201510840130.0 discloses a hook that can automatically hook and unhook. The scheme is provided with a permanent magnet, an electromagnet and a spring. When the hook lifts a heavy object, the electromagnet is not energized, and the permanent magnet attracts the non-magnetic electromagnet to prevent the hook from swinging. When it is necessary to hook and unhook, the electromagnet is energized to repel the permanent magnet, so that the hook rotates around the hinge shaft with the tip facing downward, which is convenient for hooking and unhooking. However, the scheme uses the method of preventing the hook from swinging to solve the problem of unhooking, which is obviously not reliable. At the same time, when unhooking is completed only by the rotation of the hook, it is difficult for the rope loop to detach from the hook, and the unhooking efficiency is low. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention proposes a lifting hook for a mine construction tower crane, which can achieve reliable self-locking when lifting heavy objects and rapid automatic unhooking when unloading heavy objects.

[0005] The invention discloses a lifting hook for a mine construction tower crane, which adopts the following technical scheme: it comprises a pulley, a connecting frame and a hook body; the pulley is rotatably arranged at the upper end of the connecting frame, and the steel rope of the hoisting device hangs down at the end of the lifting arm and is wound around the pulley;

[0006] The hook body can be rotatably arranged and its rotation axis is parallel to its own hook axis. A rotation groove can be rotatably arranged on the hook body. The rotation groove is located below the rotation hinge point of the hook body and at a preset position above the hook of the hook body. Arc-shaped locking gear rods are slidably inserted on both sides of the rotation groove. The two locking gear rods can slide in contact with the two side walls of the hook body. When the locking gear rods rotate to the extreme position away from the opening direction of the hook body, the rotation groove and the hook body can rotate relatively. When the locking gear rods rotate to the extreme position of forming a closed loop with the hook body, the rotation groove and the hook body are relatively locked.

[0007] An induction drive assembly is arranged in the connecting frame, and the induction drive assembly is transmission-connected to the hook body and the locking gear rod. The induction drive assembly is used for driving the locking gear rod to rotate and form a closed loop with the hook body when the hook body is loaded; and for driving the hook body to rotate in a direction so that its opening is downward when the hook body is unloaded, and driving the locking gear rod to reset, and after the locking gear rod is reset, the locking gear rod and the rotating groove are rotated in a direction opposite to the rotation of the hook body.

[0008] Optionally, the induction drive assembly includes a pressure rod, a first transmission mechanism and a second transmission mechanism, the pressure rod has a rod body and a top plate located at the upper end of the rod body, the upper end of the pressure rod is slidably arranged inside the connecting frame, the rod body of the pressure rod is sleeved with a compression spring, the lower end of the compression spring is connected to the inner bottom of the connecting frame, and the upper end is connected to the lower surface of the top plate of the pressure rod; the upper end of the hook body is rotatably connected to the lower end of the pressure rod through a pin shaft;

[0009] The first transmission mechanism is used to drive the locking gear rod to slide along the rotating groove, and to make the locking gear rod and the hook body form a closed loop when lifting the heavy object, and to reset the locking gear rod when unloading the heavy object;

[0010] The second transmission mechanism is used to rotate the hook body in a direction to make its opening downward when unloading the heavy object, and to rotate the locking gear rod and the rotating groove together in a direction opposite to the rotation direction of the hook body.

[0011] Optionally, the first transmission mechanism includes a first rack, a fourth gear and a third gear. The third gear and the fourth gear are both rotatably set on the pin shaft, and the third gear is sleeved on the outside of the fourth gear. The third gear and the fourth gear are connected by a first torsion spring. There are two groups of third gear and fourth gear, which are respectively arranged at both ends of the pin shaft. The upper arc surface of the locking gear rod is provided with teeth, and the third gear is meshed with the corresponding locking gear rod; two first racks are correspondingly provided and are vertically connected to the lower end of the connecting frame, and the first rack is meshed with the corresponding fourth gear.

[0012] The cam is connected to the bottom plate of the second gear and the third gear is engaged with the first gear and the second gear is engaged with the first gear and the third ...

[0013] Optionally, a vertically extending mounting shaft is provided at the junction of the pressure rod and the pin shaft, and the reversing gear is rotatably mounted on the mounting shaft. The inner end of the second gear and the side of the hook body are provided with end face teeth, and the teeth on the outer peripheral surface of the reversing gear are meshed with the end face teeth at the inner end of the second gear. At the same time, the teeth on the outer peripheral surface of the reversing gear are meshed with the end face teeth provided on the side of the hook body. When the second gear rotates, the rotation of the reversing gear can drive the hook body to rotate around the pin shaft from one side of the pin shaft.

[0014] Optionally, two reversing gears are correspondingly arranged for each second gear, and the two reversing gears are located on opposite sides of the pin shaft.

[0015] Optionally, initially there is a gap between the third rack and the first gear at upper and lower positions, and the third rack contacts the first gear after moving downward by a preset distance.

[0016] Optionally, a locking block is slidably provided on the rotating groove, and a sliding groove is provided on the hook body. When the rotating groove is in the initial position, the locking block corresponds to the sliding groove, a spring is provided in the sliding groove, the inner end of the spring is connected to the bottom surface of the sliding groove, and the outer end of the spring is freely suspended, and a second torsion spring is provided at the rotating connection between the rotating groove and the hook body, and the second torsion spring enables the rotating groove to maintain its initial position.

[0017] Optionally, pits are provided on the corresponding inner side surfaces of the two locking gear rods, and when the locking gear rods are in the extreme position away from the opening of the hook body, the locking blocks correspond to the corresponding pits.

[0018] Optionally, slideways are provided on the inner surfaces of the two locking gear rods, and protrusions are provided on the rotating grooves. The protrusions are located in the slideways and are slidably connected to the slideways.

[0019] The beneficial effects of the present invention are as follows: the hook body of the lifting hook for a mine construction tower crane of the present invention can be rotatably arranged, a rotating groove can be rotatably arranged on the hook body, an arc-shaped locking gear rod is slidably inserted in the rotating groove, an induction drive component is arranged in the connecting frame, the induction drive component drives the locking gear rod to rotate and form a closed loop with the hook body when the hook body is loaded; when the hook body is unloaded, the hook body is driven to rotate in the direction of making its opening downward, and the locking gear rod is driven to reset, and after the locking gear rod is reset, the locking gear rod and the rotating groove are rotated in the opposite direction to the rotation of the hook body, and then the lifting ring or rope loop on the hook body is moved toward the opening direction of the hook body. In this way, when the hook body is lifting heavy objects, it can automatically form self-locking, avoiding the influence of external factors such as wind force and inertia to cause unhooking during the lifting process; and when unloading heavy objects, the rotation of the hook body cooperates with the movement of the locking gear rod on the rope loop, which can quickly and automatically complete the unhooking, without the need for construction personnel to manually unhook, saving labor costs. The hook body can reset itself after being unhooked and carry out the next lifting operation. It is easy to operate and highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work. Those skilled in the art should understand that these drawings are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic diagram of the overall structure of a lifting hook for a mine construction tower crane according to the present invention;

[0022] Figure 2 This is a front view of a lifting hook for a mine construction tower crane according to the present invention;

[0023] Figure 3 for Figure 2 Middle AA section view;

[0024] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0025] Figure 5 The present invention is a structural schematic diagram of a lifting hook for a mine construction tower crane without a connecting frame and a pulley.

[0026] In the figure: 110, pulley; 120, pulley shaft; 210, connecting frame; 220, first rack; 230, second rack; 231, connecting rod; 240, pressure rod; 250, compression spring; 260, first gear; 270, third rack; 310, hook body; 320, locking gear rod; 330, rotating groove; 340, second gear; 350, locking block; 351, spring; 360, third gear; 370, fourth gear; 371, first torsion spring; 380, pin shaft; 390, reversing gear; 391, mounting shaft. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] like Figures 1 to 5 As shown, a lifting hook for a mine construction tower crane of the present invention comprises a pulley 110, a connecting frame 210 and a hook body 310; the pulley 110 is rotatably arranged on the upper end of the connecting frame 210 through a pulley shaft 120, and a steel rope of a winch device hangs down at the end of a lifting arm and is wound around the pulley 110 to lift heavy objects.

[0029] The hook body 310 includes a column extending in the up-down direction and a hook connected to the lower end of the column, and an opening is formed on one side of the hook for a ring or a rope to enter the hook. The hook body 310 is rotatably arranged and its rotation axis is parallel to its own hook axis. If the up and down directions are set as the vertical directions, the rotation axis of the hook body 310 extends in the horizontal direction. A rotation groove 330 is rotatably arranged on the hook body 310. The rotation groove 330 is located below the rotation hinge point of the hook body 310 and at a preset position above the hook of the hook body 310. Arc-shaped locking gear rods 320 are slidably inserted on both sides of the rotation groove 330. The two locking gear rods 320 can slide in contact with the two side walls of the hook body 310. When the locking gear rod 320 rotates to the extreme position away from the opening direction of the hook body 310, the rotation groove 330 and the hook body 310 can rotate relative to each other. When the locking gear rod 320 rotates to the extreme position of forming a closed loop with the hook body 310, the rotation groove 330 and the hook body 310 are relatively locked.

[0030] An induction drive assembly is provided in the connecting frame 210, and the induction drive assembly is transmission-connected to the hook body 310 and the locking gear rod 320. The induction drive assembly is used to drive the locking gear rod 320 to rotate and form a closed loop with the hook body 310 when the hook body 310 is loaded (that is, when lifting a heavy object), so that the hook body 310 is self-locking; and when the hook body 310 is unloaded (that is, when releasing the heavy object), the hook body 310 is driven to rotate in a direction so that its opening is downward, and the locking gear rod 320 is driven to reset, and after the locking gear rod 320 is reset, the locking gear rod 320 and the rotating groove 330 are rotated in a direction opposite to the rotation of the hook body 310, thereby scraping the lifting ring or rope loop on the hook body 310 toward the opening direction of the hook body 310, so as to realize the unhooking of the hook body 310. Through the above arrangement, the hook body 310 can automatically form a self-locking state when lifting heavy objects, thereby preventing unhooking during the lifting process due to external factors such as wind force and inertia. When unloading heavy objects, the rotation of the hook body 310 cooperates with the scraping of the locking gear rod 320 on the rope loop, which can quickly and automatically complete the unhooking. There is no need for construction workers to manually unhook, which is easy to operate and saves labor costs.

[0031] In a further embodiment, the induction drive assembly includes a pressure rod 240, a first transmission mechanism and a second transmission mechanism, the pressure rod 240 has a rod body and a top plate located at the upper end of the rod body, the upper end of the pressure rod 240 is slidably arranged inside the connecting frame 210, a compression spring 250 is sleeved on the rod body of the pressure rod 240, the lower end of the compression spring 250 is connected to the inner bottom of the connecting frame 210, and the upper end is connected to the lower surface of the top plate of the pressure rod 240. The upper end of the hook body 310 is rotatably connected to the lower end of the pressure rod 240 through a pin 380.

[0032] The first transmission mechanism is used to drive the locking gear rod 320 to slide along the rotating groove 330, and to make the locking gear rod 320 and the hook body 310 form a closed loop when lifting a heavy object, and to reset the locking gear rod 320 when unloading the heavy object.

[0033] The second transmission mechanism is used to rotate the hook body 310 in a direction to make its opening downward when unloading the heavy object, and to synchronously rotate the locking gear rod 320 and the rotating groove 330 in a direction opposite to the rotation direction of the hook body 310.

[0034] In a further embodiment, the first transmission mechanism includes a first rack 220, a fourth gear 370 and a third gear 360. The third gear 360 and the fourth gear 370 are both rotatably set on the pin shaft 380, and the third gear 360 is sleeved on the outside of the fourth gear 370. The third gear 360 and the fourth gear 370 are connected by a first torsion spring 371. The third gear 360 and the fourth gear 370 are provided with two groups, which are respectively arranged at both ends of the pin shaft 380. The upper arc surface of the locking gear rod 320 is provided with teeth, and the third gear 360 is meshed with the corresponding locking gear rod 320.

[0035] Two first racks 220 are provided and vertically connected to the lower end of the connecting frame 210 . The first racks 220 are meshed with the corresponding fourth gears 370 .

[0036] In a further embodiment, the second transmission mechanism includes a second rack 230 , a third rack 270 and a first gear 260 ; two third racks 270 are vertically arranged and respectively connected to both sides of the top plate of the pressure rod 240 .

[0037] Two second racks 230 are vertically arranged and can slide up and down on the bottom plate of the connecting frame 210 . The lower ends of the two second racks 230 are connected by a connecting rod 231 . The connecting rod 231 is located below the connecting frame 210 and above the locking gear rod 320 .

[0038] Two first gears 260 are provided and rotatably mounted on the two inner side walls of the connecting frame 210. The first gear 260 is located between the corresponding second rack 230 and the third rack 270 and meshes with the second rack 230 and the third rack 270 for transmission. The third rack 270 is a ratchet gear and drives the first gear 260 to rotate only when it moves upward.

[0039] The two ends of the pin 380 are provided with a rotatable second gear 340, the fourth gear 370 and the third gear 360 are respectively located on the periphery of the second gear 340, and the three are arranged coaxially, wherein the fourth gear 370 is connected to the second gear 340 to prevent rotation, that is, the fourth gear 370 and the second gear 340 can rotate synchronously. The second gear 340 is meshed with the second rack 230, and the second gear 340 and the first gear 260 are both located on the same side of the second rack 230. The second gear 340 is connected to the hook body 310 through the reversing gear 390, and then drives the hook body 310 to rotate in the direction of making its opening downward. That is, when the second rack 230 moves downward, it drives the second gear 340 to rotate clockwise, and the second gear 340 drives the hook body 310 to rotate counterclockwise through the reversing gear 390, and the opening of the hook body 310 gradually faces downward, realizing automatic unhooking.

[0040] Specifically, Figure 4As shown, a vertically extending mounting shaft 391 is provided at the intersection of the pressure rod 240 and the pin shaft 380, and the reversing gear 390 is rotatably mounted on the mounting shaft 391. The inner end of the second gear 340 and the side of the hook body 310 are provided with end face teeth. The teeth on the outer circumferential surface of the reversing gear 390 mesh with the end face teeth on the inner end of the second gear 340 to realize reversing transmission. At the same time, the teeth on the outer circumferential surface of the reversing gear 390 mesh with the teeth provided on the side of the hook body 310. In this way, when the second gear 340 rotates, the hook body 310 can be driven to rotate around the pin shaft 380 from one side of the pin shaft 380 by driving the reversing gear 390 to rotate. To ensure force balance, two reversing gears 390 are correspondingly arranged for each second gear 340. The two reversing gears 390 are located on both sides of the pin shaft 380. In this way, the two reversing gears 390 provide rotational force from the opposite sides of the pin shaft 380 at the same time, ensuring that the hook body 310 can rotate smoothly.

[0041] When the hook body 310 is lifting a heavy object, the pressure rod 240 moves downward relative to the connecting frame 210, and the pressure spring 250 is compressed. Since the first rack 220 is fixed on the connecting frame 210, the second gear 340 will move downward with the connecting frame 210, and the first rack 220 is meshed with the second gear 340. When the second gear 340 moves downward with the pressure rod 240, the second gear 340 will roll downward along the first rack 220, and from the outer end of the second gear 340, the second gear 340 rotates clockwise. Because the fourth gear 370 is in anti-rotation cooperation with the second gear 340, that is, the second gear 340 rotates synchronously with the fourth gear 370, and since the fourth gear 370 is connected to the third gear 360 through the torsion spring 371, when the fourth gear 370 rotates clockwise, it will also drive the third gear 360 to rotate clockwise. Since the third gear 360 is meshed with the teeth on the outer side of the locking gear rod 320 , when the third gear 360 rotates clockwise, the third gear 360 can drive the locking gear rod 320 to slide in the rotating groove 330 toward the opening direction of the hook body 310 , thereby forming a closed loop with the hook body 310 .

[0042] When the hook body 310 unloads the heavy object, the compression spring 250 is reset to drive the compression rod 240 to move upward relative to the connecting frame 210, the fourth gear 370 and the third gear 360 are reversed, and the locking gear rod 320 is reset. Since the third gear 360 is sleeved on the outside of the fourth gear 370, and the diameter of the third gear 360 is larger than the diameter of the fourth gear 370, the compression rod 240 can move a small distance to make the locking gear rod 320 move a large distance, thereby ensuring that the locking gear rod 320 quickly completes self-locking during lifting and quickly resets during unloading. Due to the existence of the first torsion spring 371, when the locking gear rod 320 moves to the extreme position, the third gear 360 cannot rotate, and the compression rod 240 continues to move, which will cause the first torsion spring 371 to accumulate force to prevent the third gear 360 and the third gear 360 from getting stuck.

[0043] In a further embodiment, a locking block 350 is slidably provided on the rotating groove 330, and a sliding groove is provided on the hook body 310. When the rotating groove 330 is in the initial position, the locking block 350 corresponds to the sliding groove, and a spring 351 is provided in the sliding groove. The inner end of the spring 351 is connected to the bottom surface of the groove of the sliding groove, and the outer end of the spring 351 is freely suspended. A second torsion spring (not shown in the figure) is provided at the rotation connection between the rotating groove 330 and the hook body 310, and the second torsion spring enables the rotating groove 330 to maintain the initial position.

[0044] The corresponding inner sides of the two locking gear rods 320 are both provided with pits. When the locking gear rods 320 are at the extreme position away from the opening of the hook body 310, the locking block 350 corresponds to the corresponding pit. When the locking block 350 corresponds to the corresponding pit, the outer end of the locking block 350 is pressed into the pit under the action of the spring 351 and then disengaged from the hook body 310, thereby releasing the restriction on the rotating groove 330; when the locking gear rod 320 rotates toward the opening direction of the hook body 310, the locking block 350 is disengaged from the pit, and under the pushing of the inner end surface of the locking gear rod 320, the elastic force of the spring 351 is overcome to make the inner end enter the slide groove of the hook body 310, thereby achieving the locking of the rotating groove 330.

[0045] In a further embodiment, to facilitate the sliding connection between the locking gear rod 320 and the rotating groove 330, as shown in FIG. Figure 4 and Figure 5 As shown, the inner surfaces of the two locking gear rods 320 are provided with slideways, and the rotating groove 330 is provided with protrusions, which are located in the slideways and slidably connected with the slideways.

[0046] In a further embodiment, initially, there is a gap between the third rack 270 and the first gear 260 at the upper and lower positions, and the third rack 270 contacts the first gear 260 after moving downward by a preset distance. Setting a gap between the third rack 270 and the first gear 260 can ensure that when the hook body 310 is reset, after the compression spring 250 is fully reset, the third rack 270 is disengaged from the first gear 260, and the rotating groove 330 is reset under the action of the second torsion spring, driving the locking gear rod 320 to reset synchronously, and the locking gear rod 320 pushes the second rack 230 to reset upward, thereby allowing the second gear 340 to drive the hook body 310 to reset, avoiding the third rack 270 being unable to move due to the pressure rod 240 during the reset process, thereby restricting the reset of the third rack, and ensuring reliable reset.

[0047] The following is a detailed description of the use principle and working process of the present invention in combination with the above embodiments.

[0048] Initially Figure 1 , Figure 2 and Figure 5 As shown, the locking gear rod 320 extends to the extreme position in the direction away from the opening of the hook body 310. At this time, the opening of the hook body 310 is in a fully open state. The locking block 350 extends into the pit of the locking gear rod 320 under the action of the spring 351 to release the lock of the rotating groove 330. The rotating groove 330 basically overlaps with the column of the hook body 310 under the action of the second torsion spring, and the third rack 270 is not in contact with the first gear 260.

[0049] When lifting, first put the lifting ring or rope on the hook of the hook body 310, and then start the winch to reel in the steel rope. At this time, the hook body 310 is loaded, and the pressure rod 240 moves downward relative to the connecting frame 210 and compresses the compression spring 250. Due to the relative movement of the pressure rod 240 and the connecting frame 210, the fourth gear 370 moves downward along the first rack 220 and rotates clockwise. The fourth gear 370 drives the third gear 360 to rotate, and the third gear 360 drives the locking gear rod 320 to slide in the rotating groove 330 toward the opening direction close to the hook body 310 until the locking gear rod 320 slides and forms a closed loop with the hook body 310. During the sliding process of the locking gear rod 320, the locking block 350 escapes from the pit of the locking gear rod 320 and enters the hook body 310 under the pushing of the side of the locking gear rod 320, thereby locking the rotating groove 330. By locking the sliding of the gear rod 320, the hook body 310 is self-locked, and the hook body 310 is prevented from being unhooked due to external factors such as wind force and inertia during the lifting process, thereby improving safety. At the same time, the pressure rod 240 drives the third rack 270 to move downward during the downward movement, and the third rack 270 contacts the first gear 260. However, due to the ratchet engagement between the third rack 270 and the first gear 260, the third rack 270 contacts the first gear 260 but does not transmit the power.

[0050] After hoisting to the destination, the lifted object is put down. When the lifted object touches the ground, the hook body 310 is no longer loaded and is in an unloading state. The compression spring 250 is released, and the compression rod 240 moves upward relative to the connecting frame 210. The fourth gear 370 moves upward along the first rack 220 and rotates counterclockwise. At this time, the first rack 220 drives the fourth gear 370 to reverse, and the fourth gear 370 drives the third gear 360 to rotate in the opposite direction. The third gear 360 drives the locking gear rod 320 to reset to the initial position. When the locking gear rod 320 is reset to the extreme position, the locking block 350 disengages from the hook body 310 and enters the pit on the end face of the locking gear rod 320, thereby releasing the lock on the rotating groove 330.

[0051] During the upward movement of the pressure rod 240, the third rack 270 drives the first gear 260 to rotate clockwise, and the first gear 260 drives the second rack 230 to move downward. The downward movement of the second rack 230 drives the second gear 340 to rotate clockwise, and the clockwise rotation of the second gear 340 drives the hook body 310 to rotate counterclockwise through the reversing gear 390. During the counterclockwise rotation of the hook body 310, the opening gradually moves downward, and then the hook is automatically unhooked. At the same time, since the locking gear rod 320 is reset, the rotating groove 330 is no longer fixed. When the second rack 230 moves downward, it presses the locking gear rod 320, and then drives the locking gear rod 320 and the rotating groove 330 to rotate clockwise together. During the rotation of the rotating groove 330, the locking gear rod 320 moves the ring or rope loop from the hook body 310 to the opening direction of the hook body 310, and the automatic unhooking can be completed quickly and reliably with the rotation of the hook body 310, without the need for construction personnel to manually unhook, which is convenient to operate and saves labor costs.

[0052] When the compression spring 250 is completely reset, the third rack 270 is disengaged from the first gear 260, and the rotating groove 330 is reset under the action of the second torsion spring. While the rotating groove 330 is reset, it also drives the locking gear rod 320 to reset. The locking gear rod 320 pushes the second rack 230 to reset. During the reset of the second rack 230, it drives the second gear 340 to reverse. The second gear 340 drives the hook body 310 to reset through the reversing gear 390, and the device can then carry out the next lifting operation.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lifting hook for a mine construction tower crane, characterized in that: It includes a pulley, a connecting frame and a hook body; the pulley is rotatably arranged on the upper end of the connecting frame, and the steel rope of the hoisting device hangs down at the end of the crane arm and is wound around the pulley; The hook body can be rotatably arranged and its rotation axis is parallel to the axis of its own hook. A rotation groove can be rotatably arranged on the hook body. The rotation groove is located below the rotation hinge point of the hook body and at a preset position above the hook of the hook body. Arc-shaped locking gear rods are slidably inserted on both sides of the rotation groove. The two locking gear rods can slide in contact with the two side walls of the hook body. When the locking gear rods are rotated to the extreme position away from the opening direction of the hook body, the rotation groove and the hook body can rotate relative to each other. When the locking gear rods are rotated to the extreme position of forming a closed loop with the hook body, the rotation groove and the hook body are relatively locked. An induction drive assembly is arranged in the connecting frame, and the induction drive assembly is transmission-connected to the hook body and the locking gear rod. The induction drive assembly is used to drive the locking gear rod to rotate and form a closed loop with the hook body when the hook body is loaded; and to drive the hook body to rotate in the direction of making its opening downward when the hook body is unloaded, and drive the locking gear rod to reset, and after the locking gear rod is reset, the locking gear rod and the rotation groove are rotated in the direction opposite to the rotation of the hook body; the induction drive assembly includes a pressure rod, a first transmission mechanism and a second transmission mechanism, the pressure rod has a rod body and a top plate located at the upper end of the rod body, the upper end of the pressure rod can be slidably arranged inside the connecting frame, and a compression spring is sleeved on the rod body of the pressure rod, the lower end of the compression spring is connected to the inner bottom of the connecting frame, and the upper end is connected to the lower surface of the top plate of the pressure rod; the upper end of the hook body is rotatably connected to the lower end of the pressure rod through a pin shaft; The first transmission mechanism is used to drive the locking gear rod to slide along the rotating groove, and to make the locking gear rod and the hook body form a closed loop when lifting the heavy object, and to reset the locking gear rod when unloading the heavy object; The second transmission mechanism is used to rotate the hook body in the direction of making its opening downward when unloading the heavy object, and to rotate the locking gear rod and the rotating groove in the direction opposite to the rotation direction of the hook body; the first transmission mechanism includes a first rack, a fourth gear and a third gear, the third gear and the fourth gear are both rotatably arranged on the pin shaft, and the third gear is sleeved on the outer side of the fourth gear, the third gear and the fourth gear are connected by a first torsion spring, the third gear and the fourth gear are provided with two groups, which are respectively arranged at the two ends of the pin shaft, the upper arc surface of the locking gear rod is provided with teeth, and the third gear is meshed with the corresponding locking gear rod; the first rack is correspondingly provided with two, And it is vertically connected to the lower end of the connecting frame, and the first rack is meshed with the corresponding fourth gear; the second transmission mechanism includes a second rack, a third rack and the first gear; two third racks are vertically arranged, which are respectively connected to the two sides of the top plate of the pressure rod; two second racks are vertically arranged, both of which are slidable up and down on the bottom plate of the connecting frame, and the lower ends of the two second racks are connected by a connecting rod, which is located below the connecting frame and above the locking gear rod; two first gears are arranged, and are rotatably installed on the two inner side walls of the connecting frame, the first gear is located between the corresponding second rack and the third rack and meshes with the second rack and the third rack for transmission, and the third rack is a ratchet rack The second gear is meshed with the second rack, and the second gear and the first gear are located on the same side of the second rack. The second gear is connected to the hook body through the reversing gear, thereby driving the hook body to rotate in the direction of making its opening downward. A vertically extending mounting shaft is provided at the intersection of the pressure rod and the pin shaft, and the reversing gear is rotatably mounted on the mounting shaft. The inner end of the second gear and the side surface of the hook body are provided with end face teeth, and the teeth on the outer peripheral surface of the reversing gear are meshed with the end face teeth on the inner end of the second gear. The end teeth arranged on the surface are meshed. When the second gear rotates, the reversing gear rotates to drive the hook body to rotate around the pin shaft from one side of the pin shaft. A locking block is slidably arranged on the rotating groove, and a slide groove is arranged on the hook body. When the rotating groove is in the initial position, the locking block corresponds to the slide groove. A spring is arranged in the slide groove, and the inner end of the spring is connected to the bottom surface of the groove of the slide groove, and the outer end of the spring is freely suspended. A second torsion spring is arranged at the rotating connection between the rotating groove and the hook body. The second torsion spring enables the rotating groove to maintain its initial position. Pits are arranged on the corresponding inner side surfaces of the two locking gear rods. When the locking gear rod is in the extreme position away from the opening of the hook body, the locking block corresponds to the corresponding pit.

2. A lifting hook for a mine construction tower crane according to claim 1, characterized in that: Two reversing gears are correspondingly arranged for each second gear, and the two reversing gears are located on opposite sides of the pin shaft.

3. The lifting hook for a mine construction tower crane according to claim 1, characterized in that: Initially, there is a gap between the third rack and the first gear at the upper and lower positions, and the third rack contacts the first gear after moving downward by a preset distance.

4. The lifting hook for a mine construction tower crane according to claim 1, characterized in that: The inner surfaces of the two locking gear rods are provided with slideways, and the rotating groove is provided with protrusions, which are located in the slideways and are slidably connected with the slideways.

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