Anti-unhooking device of crane

Abstract

The invention discloses a crane anti-unhooking device in the technical field of cranes. A gear is rotationally connected to a first supporting seat, a stop lever is connected to the gear, a rack is connected to a second supporting seat, the rack is meshed with the gear, and the first supporting seat and the second supporting seat can vertically move relatively, so that the rack drives the gear to rotate. The gravity of a to-be-lifted object and the elastic force of the reset piece are ingeniously utilized, and when the to-be-lifted object is lifted, the stop lever automatically shields the opening of the lifting hook under the transmission of the gear and the rack by utilizing the gravity of the to-be-lifted object; when the to-be-lifted object reaches a designated position, the to-be-lifted object is put down, manual operation is not needed, and the opening portion of the lifting hook is automatically opened through the elastic force of the reset piece and the transmission of the gear and the rack by the stop lever. The technical problems that in the prior art, a hook body can only be taken down by manually pulling out a limiting pin, operation is inconvenient, and working efficiency is low are solved, and operation convenience and working efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of cranes, and in particular to an anti-unhooking device for cranes. Background Art

[0002] Cranes are commonly used in industrial production and play an important role in lifting operations. Most existing crane hooks are ordinary C-shaped hooks without any safety measures at the opening. Once the C-shaped hook is overloaded, it is easy to detach from the tooling lifting hole, which is very dangerous.

[0003] A Chinese utility model patent with publication number CN221759331U discloses an anti-unhooking device for a crane, comprising a hook body, a U-shaped connector sleeved on the outer side of the hook body, a limiting mechanism connected internally to the U-shaped connector, a sleeve block fixedly connected to the outer side of the hook body, a connecting shaft symmetrically fixedly connected to the outer side of the sleeve block, two groups of connecting shafts are fixedly connected to opposite sides with stop rods, a side of the two groups of stop rods away from the sleeve block is fixedly connected to a limiting rod, the limiting rod corresponds to the hook body, a torsion spring is fixedly connected between the two groups of stop rods and the sleeve block, a limiting pin is slidably connected to the inside of the stop rod on one side, a limiting groove corresponding to the limiting pin is provided on one side of the sleeve block, a traction block is fixedly connected to one end of the limit pin away from the sleeve block, and a first spring is fixedly connected between the traction block and the stop rod.

[0004] When the above device hangs the object to be hung on the hook body, it is necessary to manually rotate the baffle rod, and the baffle rod drives the limit rod to rotate. When the limit rod contacts the hook body, the limit pin is manually inserted into the limit groove to lock it. When the object to be hung is to be removed, the limit pin is manually pulled out. Under the action of the torsion spring, the baffle rod is driven to rotate, and the baffle rod drives the limit rod to rotate, thereby releasing the contact state between the limit rod and the hook body.

[0005] When unloading heavy objects, this type of crane anti-unhooking device requires manual pulling out of the limit pin to remove the hook. In some scenarios, such as during the lifting of large heavy objects, the operator can stand far away from the hook, and the hook is at a higher position, which makes it inconvenient to remove the hook, increasing the complexity of the operation and reducing work efficiency. Summary of the invention

[0006] In order to solve the technical problems in the prior art of relying on manual pulling out of a limit pin to remove the hook body, which is inconvenient to operate and has low working efficiency, the present invention provides a crane anti-unhooking device that is easy to operate and has high working efficiency.

[0007] The technical solution adopted by the present invention to solve its technical problem is:

[0008] The anti-unhooking device of a crane comprises a hook, and an anti-unhooking mechanism is arranged on the hook, and the anti-unhooking mechanism comprises:

[0009] A first component, the first component includes a first support seat, a gear and a stop rod, the gear is rotatably connected to the first support seat, and the stop rod is connected to the gear;

[0010] The second component includes a second support seat and a rack, the rack is connected to the second support seat, the rack is meshed with the gear, any one of the first support seat and the second support seat is connected to the neck of the hook, the first support seat and the second support seat can move vertically relative to each other, so that the rack drives the gear to rotate;

[0011] A reset member, located between the first support seat and the second support seat, and acting on the first support seat and the second support seat;

[0012] The blocking rod has a first state and a second state and can be switched between the first state and the second state. When the blocking rod is in the first state, the second support seat moves downward under the action of the gravity of the object to be hoisted, so that the rack drive gear rotates forward, and one end of the blocking rod abuts against the end of the hook to close the mouth of the hook. When the blocking rod is in the second state, the second support seat moves upward under the action of the reset member, so that the rack drive gear rotates reversely, and one end of the blocking rod is disengaged from the end of the hook to open the mouth of the hook.

[0013] Furthermore, the lower end of the second support seat is connected to the neck of the hook, and the rack is vertically arranged on the peripheral side of the lower end of the second support seat. The first support seat has a chamber, and the chamber is provided with a first cavity and a second cavity from top to bottom. The inner diameter of the first cavity is larger than the inner diameter of the second cavity. A step is formed at the junction of the first cavity and the second cavity. The upper end of the second support seat is located in the first cavity and can move up and down in the first cavity. The step is used to limit the upper end of the second support seat. The reset member is located in the chamber, and the reset member is sleeved on the second support seat. One end of the reset member abuts against the upper end of the second support seat, and the other end of the reset member abuts against the bottom wall of the chamber.

[0014] Furthermore, the first section of the cavity includes a vertical cavity and an oblique cavity from top to bottom, the oblique cavity is used to connect the vertical cavity and the second section of the cavity, the upper end of the second support seat has an inclined surface matching the oblique cavity, and the inner wall of the oblique cavity is used to support the second support seat.

[0015] Furthermore, the first support seat is fixed to the neck of the hook, and the reset member is sleeved on the neck of the hook. One end of the reset member abuts against the first support seat, and the other end of the reset member abuts against the second support seat. The rack is vertically arranged on the peripheral side of the second support seat. An articulated support is arranged on the first support seat, and the gear is hinged to the articulated support. It also includes a hanging member, which has a hanging part and a matching part. The matching part is located above the hanging part and is connected to the hanging part. The hanging part enters through the mouth of the hook and is hung on the hook. The matching part contacts the top of the second support seat, and the matching part moves synchronously with the hanging part and presses down the second support seat.

[0016] Furthermore, the hanging part includes a first connecting rod, a first enclosure and a second enclosure, the first enclosure and the second enclosure are both horizontally arranged, the first enclosure is located above the second enclosure, the first enclosure and the second enclosure are connected by the first connecting rod, the first enclosure is provided with an opening, the hook enters into the first enclosure through the opening so that the first enclosure is hung on the hook, the matching part includes a C-shaped frame and a second connecting rod, the C-shaped frame is horizontally arranged, the C-shaped frame is used to contact with the top of the second support seat, and the C-shaped frame is connected to the first enclosure by the second connecting rod.

[0017] Furthermore, the hook has four hook parts, which are arranged at intervals around the vertical line.

[0018] Furthermore, the first support seat is provided with four gears corresponding to the four hook positions, each gear is provided with a blocking rod, and the second support seat is provided with four racks, and the position of a single rack corresponds to a single gear.

[0019] Furthermore, the reset element is a spring.

[0020] The beneficial effects of the present invention are:

[0021] The anti-unhooking device of the crane that can be opened automatically in the present application can realize the automatic opening of the anti-unhooking device, and solves the problem of the inconvenience of manually opening the anti-unhooking device in some occasions where it is difficult for humans to touch the hook. By rotating the gear to connect to the first support seat, the blocking rod is connected to the gear, and the rack is connected to the second support seat, the rack is meshed with the gear, and the first support seat and the second support seat can move vertically relative to each other, so that the rack drives the gear to rotate. The gravity of the object to be hoisted and the elastic force of the reset member are cleverly used. When the object to be hoisted is hoisted, the gravity of the object to be hoisted is used, and the blocking rod is automatically shielded by the transmission of the gear and the rack under the transmission of the gear and the rack; when the object to be hoisted reaches the designated position, the object to be hoisted is put down without manual operation, and the blocking rod is automatically opened by the transmission of the gear and the rack under the transmission of the gear and the rack using the elastic force of the reset member. Even if there is a large bump during the hoisting process, the blocking rod can still shield the mouth of the hook, which makes the operation convenient and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the first embodiment of the present invention when the barrier lever is completely retracted;

[0023] Figure 2 is a schematic structural diagram of a blocking rod in a first embodiment of the present invention that is fully deployed;

[0024] Figure 3 yes Figure 2 A partial enlarged view of middle A;

[0025] Figure 4 is a structural schematic diagram of the critical state of the barrier lever being folded and unfolded according to the second embodiment of the present invention;

[0026] Figure 5 yes Figure 4 A partial enlarged view of B in the middle;

[0027] Figure 6 is a schematic structural diagram of a second embodiment of the present invention in which the baffle bar is fully deployed;

[0028] Figure 7 yes Figure 6 A partial enlarged view of middle C;

[0029] Figure 8 is a three-dimensional schematic diagram of a second embodiment of the present invention;

[0030] Fig. 9 is a schematic structural diagram of a pendant according to a second embodiment of the present invention;

[0031] Marked in the figure are, 1-hook, 2-first supporting seat, 3-gear, 4-blocking rod, 5-second supporting seat, 6-rack, 7-resetting member, 8-first section cavity, 81-vertical cavity, 82-oblique cavity, 9-second section cavity, 10-first connecting rod, 11-first surrounding frame, 12-second surrounding frame, 13-opening, 14-C-shaped frame, 15-second connecting rod. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the embodiments of the present application more clearly expressed, the present invention is further described below in conjunction with the accompanying drawings.

[0033] First of all, it needs to be stated that the technical solutions of the embodiments of the present application are clearly and completely described. The described embodiments are part of the embodiments of the present application, and are not limitations of the present invention. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0034] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “first”, “second”, “upper”, “lower”, “left”, “right”, “inner”, “outer”, “axial” or “radial” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They are not intended to indicate or imply that the device or element referred to must have a specific orientation structure and operation, and therefore cannot be understood as a limitation on the present invention.

[0035] It should be noted that, in the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] like Figures 1 to 9 As shown, the present invention provides a crane anti-unhooking device.

[0037] The anti-unhooking device of the crane comprises a hook 1, on which an anti-unhooking mechanism is arranged, and the anti-unhooking mechanism comprises:

[0038] The first component includes a first support seat 2, a gear 3 and a stopper 4. The gear 3 is rotatably connected to the first support seat 2, and the stopper 4 is connected to the gear 3. The stopper 4 can be welded or integrally formed with the gear 3, or can be connected by a clamp or bolt, which is not particularly limited here. The rotatable connection can be hinged, or connected to the first support seat 2 through a bearing and a fixed shaft;

[0039] The second component includes a second support seat 5 and a rack 6, the rack 6 is connected to the second support seat 5, the rack 6 is meshed with the gear 3, any one of the first support seat 2 and the second support seat 5 is connected to the neck of the hook 1, the first support seat 2 and the second support seat 5 can move vertically relative to each other, so that the rack 6 drives the gear 3 to rotate;

[0040] The reset member 7 is located between the first support seat 2 and the second support seat 5 and acts on the first support seat 2 and the second support seat 5. One end of the reset member 7 is connected to or in contact with the first support seat 2, and the other end of the reset member 7 is connected to or in contact with the second support seat 5, for resetting the second support seat 5.

[0041] The blocking rod 4 has a first state and a second state and can be switched between the first state and the second state. When the blocking rod 4 is in the first state, the second support seat 5 moves downward under the gravity of the object to be hoisted, so that the rack 6 drives the gear 3 to rotate forward, and one end of the blocking rod 4 abuts against the end of the hook 1 to close the mouth of the hook 1. When the blocking rod 4 is in the second state, the second support seat 5 moves upward under the action of the reset member 7, so that the rack 6 drives the gear 3 to rotate in the opposite direction, and one end of the blocking rod 4 is disengaged from the end of the hook 1 to open the mouth of the hook 1.

[0042] The anti-unhooking device of the crane that can be opened automatically in the present application can realize the automatic opening of the anti-unhooking device, and solves the problem of inconvenience of manually opening the anti-unhooking device in some occasions where it is difficult for humans to touch the hook 1. By rotating the gear 3 and connecting it to the first support seat 2, the blocking rod 4 is connected to the gear 3, and the rack 6 is connected to the second support seat 5, the rack 6 is meshed with the gear 3, and the first support seat 2 and the second support seat 5 can move vertically relative to each other, so that the rack 6 drives the gear 3 to rotate. The gravity of the object to be hoisted and the elastic force of the reset member 7 are cleverly used. When the object to be hoisted is hoisted, the blocking rod 4 automatically shields the mouth of the hook 1 under the transmission of the gear 3 and the rack 6 by utilizing the gravity of the object to be hoisted; when the object to be hoisted reaches the designated position, the object to be hoisted is put down without manual operation, and the blocking rod 4 automatically opens the mouth of the hook 1 under the transmission of the gear 3 and the rack 6 by utilizing the elastic force of the reset member 7. Even if there is a large bump during the hoisting process, the blocking rod 4 can still shield the mouth of the hook 1, which makes the operation convenient and improves the work efficiency.

[0043] For any one of the first supporting seat 2 and the second supporting seat 5 to be connected to the neck of the hook 1 , the present invention has a first embodiment and a second embodiment.

[0044] First embodiment:

[0045] like Figures 1 to 3 As shown, the lower end of the second support seat 5 is connected to the neck of the hook 1, and the rack 6 is vertically arranged on the peripheral side of the lower end of the second support seat 5. The first support seat 2 has a chamber, and the chamber is provided with a first section cavity 8 and a second section cavity 9 from top to bottom. The inner diameter of the first section cavity 8 is larger than the inner diameter of the second section cavity 9, and a step is formed at the junction of the first section cavity 8 and the second section cavity 9. The upper end of the second support seat 5 is located in the first section cavity 8 and can move up and down in the first section cavity 8. The step is used to limit the upper end of the second support seat 5. The reset member 7 is located in the chamber, and the reset member 7 is sleeved on the second support seat 5. One end of the reset member 7 abuts against the upper end of the second support seat 5, and the other end of the reset member 7 abuts against the bottom wall of the chamber. When the hanging object is hung on the hook 1, and the gravity of the hanging object and the hook 1 is greater than the elastic force of the reset member 7, the hook 1 moves downward, and then drives the second support seat 5 to move downward, and then drives the rack 6 to move downward. Since the rack 6 is meshed with the gear 3, the gear 3 rotates forward, so that one end of the blocking rod 4 abuts against the end of the hook 1 to close the mouth of the hook 1, and the upper end of the second support part abuts against the step to support the second support seat 5; when the heavy object on the hook 1 is placed at the specified position, the rebound force of the reset member 7 is greater than the gravity of the hook 1, and the elastic force of the reset member 7 drives the hook 1 and the second support seat 5 to move upward, and then drives the rack 6 to move upward. Since the rack 6 is meshed with the gear 3, the gear 3 rotates in the opposite direction, and one end of the blocking rod 4 is separated from the end of the hook 1 to open the mouth of the hook 1. Such a design can realize the automatic opening of the anti-unhooking device, which solves the problem of the inconvenience of manually opening the anti-unhooking device in some occasions where it is difficult for humans to touch the hook 1.

[0046] For the first section cavity 8, the first section cavity 8 can be a vertical cavity 81, which supports the second support seat 5 by means of a step; Figure 3 As shown, the first section cavity 8 includes a vertical cavity 81 and an oblique cavity 82 from top to bottom. The oblique cavity 82 is used to connect the vertical cavity 81 and the second section cavity 9. The upper end of the second support seat 5 has an inclined surface matching the oblique cavity 82. The inner wall of the oblique cavity 82 is used to support the second support seat 5. Using the inner wall of the oblique cavity 82 to support the second support seat 5 is more stable, prevents the second support seat 5 from shifting left and right, and reduces the bumping of the hook 1.

[0047] Second embodiment:

[0048] like Figures 4 to 9 As shown, the first support seat 2 is fixed to the neck of the hook 1, and the reset member 7 is sleeved on the neck of the hook 1. One end of the reset member 7 abuts against the first support seat 2, and the other end of the reset member 7 abuts against the second support seat 5. The rack 6 is vertically arranged on the side of the second support seat 5. An articulated support is arranged on the first support seat 2, and the gear 3 is hinged to the articulated support. It also includes a hanging member, which has a hanging part and a matching part. The matching part is located above the hanging part and is connected to the hanging part. The hanging part enters through the mouth of the hook 1 and is hung on the hook 1. The matching part contacts the top of the second support seat 5, and the matching part moves synchronously with the hanging part and presses down the second support seat 5.

[0049] like Figure 4 and Figure 5 As shown, the hanging part of the hanger enters into the hook 1 through the mouth of the hook 1. At this time, the hanging part is not in contact with the hook 1, and there is still a certain gap between the hanging part and the hook 1. The matching part of the hanger is in contact with the top of the second support seat 5. At this time, the blocking rod 4 is in a critical state between the retracted state and the unfolded state. If the hanger continues to descend at this time, the blocking rod 4 will gradually unfold.

[0050] like Figure 6 and Figure 7As shown, at this time, the blocking rod 4 is in a fully expanded state, and the hanging part is in contact with the hook 1. The principle is: the blocking rod 4 is in a critical state between the retracted state and the expanded state, and there is still a certain gap between the hanging part and the hook 1. When the hook 1 is lifted upward, the gravity of the hanging part is concentrated on the matching part of the hanging part. The gravity of the hanging part is greater than the elastic force of the reset part 7, so that the matching part and the hanging part move downward synchronously and press down the second support seat 5. When the second support seat 5 moves downward, it drives the rack 6 to move downward. When the hook 1 is moved, the rack 6 is meshed with the gear 3, and the gear 3 rotates forward, so that one end of the blocking rod 4 abuts against the end of the hook 1 to close the mouth of the hook 1; when the hanging part is placed at the designated position, the hook 1 moves downward, and the hook 1 does not bear the weight of the hanging part at this time. The rebound effect of the reset part 7 drives the second support seat 5 to move upward, and then drives the rack 6 to move upward. Since the rack 6 is meshed with the gear 3, the gear 3 rotates in the opposite direction, and one end of the blocking rod 4 is separated from the end of the hook 1 to open the mouth of the hook 1. Such a design can realize the automatic opening of the anti-unhooking device, which solves the problem of the inconvenience of manually opening the anti-unhooking device in some occasions where it is difficult for humans to touch the hook 1.

[0051] As for the hangers, the hangers can be used to fix or install the objects to be hung.

[0052] like Figure 8 and Fig. 9 As shown, the hanging part includes a first connecting rod 10, a first enclosure 11 and a second enclosure 12. The first enclosure 11 and the second enclosure 12 are both arranged horizontally. The first enclosure 11 is located above the second enclosure 12. The first enclosure 11 and the second enclosure 12 are connected by the first connecting rod 10. The first enclosure 11 is provided with an opening 13. The hook 1 enters the first enclosure 11 through the opening 13 so that the first enclosure 11 is hung on the hook 1. The matching part includes a C-shaped frame 14 and a second connecting rod 15. The C-shaped frame 14 is arranged horizontally. The C-shaped frame 14 is used to contact the top of the second support seat 5. The C-shaped frame 14 is connected to the first enclosure 11 through the second connecting rod 15. Of course, the setting of the hanging part and the matching part can also adopt other settings to ensure that the hanging part and the matching part are connected and can move synchronously. The hanging part has a hanging position for the hook 1 to hang up, and the matching part is located above the hanging part. The matching part has a part for pressing down the second support part 5, which is not limited to the above preferred embodiments.

[0053] The first surrounding frame 11 and the second surrounding frame 12 can be circular rings, square frames, or frames of other shapes, which are not particularly limited here.

[0054] Furthermore, in order to facilitate the hook 1 to stably and accurately hook the first enclosure 11, the hook 1 may be provided with one or more hooks. In this embodiment, preferably, the hook 1 has four hooks, which are arranged in a ring-shaped interval around the vertical line. In this way, the hook 1 can stably and accurately hook the first enclosure 11, and there is a limiter of the first connecting rod 10 to prevent the hook 1 from slipping through the opening 13 of the first enclosure 11. However, even if the hook 1 is provided with one or more hooks, the blocking rod 4 can be used only in one or more hooks to cover the mouth of the hook 1. In this embodiment, preferably, the first support seat 2 has four gears 3 corresponding to the positions of the four hooks, and each gear 3 is provided with a blocking rod 4. The second support seat 5 is provided with four racks 6, and the position of a single rack 6 corresponds to a single gear 3.

[0055] Furthermore, the reset member 7 may be made of an elastic body, such as rubber, or a spring, or other workpieces with compression and reset functions. In this embodiment, the reset member 7 is preferably a spring.

Claims

1. A crane anti-unhooking device, comprising a hook (1), wherein the hook (1) is provided with an anti-unhooking mechanism, wherein: The anti-unhooking mechanism includes: A first component, the first component comprises a first support base (2), a gear (3) and a blocking rod (4), the gear (3) being rotatably connected to the first support base (2), and the blocking rod (4) being connected to the gear (3); The second component comprises a second support seat (5) and a rack (6), the rack (6) is connected to the second support seat (5), the rack (6) is meshed with the gear (3), any one of the first support seat (2) and the second support seat (5) is connected to the neck of the hook (1), the first support seat (2) and the second support seat (5) can move vertically relative to each other, thereby causing the rack (6) to drive the gear (3) to rotate; A reset member (7) is located between the first support seat (2) and the second support seat (5), and acts on the first support seat (2) and the second support seat (5); The blocking rod (4) has a first state and a second state and can be switched between the first state and the second state. When the blocking rod (4) is in the first state, the second support seat (5) moves downward under the action of the gravity of the object to be hoisted, so that the rack (6) drives the gear (3) to rotate in the forward direction, and one end of the blocking rod (4) abuts against the end of the hook (1) to close the mouth of the hook (1). When the blocking rod (4) is in the second state, the second support seat (5) moves upward under the action of the reset member (7), so that the rack (6) drives the gear (3) to rotate in the reverse direction, and one end of the blocking rod (4) is separated from the end of the hook (1) to open the mouth of the hook (1).

2. The anti-unhooking device for a crane according to claim 1, characterized in that: The lower end of the second support seat (5) is connected to the neck of the hook (1), and the rack (6) is vertically arranged on the peripheral side of the lower end of the second support seat (5). The first support seat (2) has a chamber, and the chamber is provided with a first section chamber (8) and a second section chamber (9) from top to bottom. The inner diameter of the first section chamber (8) is larger than the inner diameter of the second section chamber (9), and a step is formed at the junction of the first section chamber (8) and the second section chamber (9). The upper end of the second support seat (5) is located in the first section chamber (8) and can move up and down in the first section chamber (8). The step is used to limit the upper end of the second support seat (5). The reset member (7) is located in the chamber, and the reset member (7) is sleeved on the second support seat (5). One end of the reset member (7) abuts against the upper end of the second support seat (5), and the other end of the reset member (7) abuts against the bottom wall of the chamber.

3. The anti-unhooking device for a crane according to claim 2, characterized in that: The first section cavity (8) comprises a vertical cavity (81) and an oblique cavity (82) from top to bottom, the oblique cavity (82) is used to connect the vertical cavity (81) and the second section cavity (9), the upper end of the second support seat (5) has an inclined surface matching the oblique cavity (82), and the inner wall of the oblique cavity (82) is used to support the second support seat (5).

4. The anti-unhooking device for a crane according to claim 1, characterized in that: The first support seat (2) is fixed to the neck of the hook (1), and the reset member (7) is sleeved on the neck of the hook (1). One end of the reset member (7) abuts against the first support seat (2), and the other end of the reset member (7) abuts against the second support seat (5). The rack (6) is vertically arranged on the peripheral side of the second support seat (5). The first support seat (2) is provided with an articulated support, and the gear (3) is articulated with the articulated support. It also includes a hanging member, which has a hanging part and a matching part. The matching part is located above the hanging part and is connected to the hanging part. The hanging part enters through the mouth of the hook (1) and is hung on the hook (1). The matching part contacts the top of the second support seat (5). The matching part moves synchronously with the hanging part and presses down the second support seat (5).

5. The anti-unhooking device for a crane according to claim 4, characterized in that: The hanging part comprises a first connecting rod (10), a first enclosure (11) and a second enclosure (12); the first enclosure (11) and the second enclosure (12) are both arranged horizontally; the first enclosure (11) is located above the second enclosure (12); the first enclosure (11) and the second enclosure (12) are connected via the first connecting rod (10); the first enclosure (11) is provided with an opening (13); the hook (1) enters the first enclosure (11) through the opening (13) so that the first enclosure (11) is hung on the hook (1); the matching part comprises a C-shaped frame (14) and a second connecting rod (15); the C-shaped frame (14) is arranged horizontally; the C-shaped frame (14) is used to contact the top of the second support seat (5); the C-shaped frame (14) and the first enclosure (11) are connected via the second connecting rod (15).

6. The anti-unhooking device for a crane according to claim 1, characterized in that: The hook (1) has four hook parts, which are arranged at intervals in a ring shape around a vertical line.

7. The anti-unhooking device for a crane according to claim 6, characterized in that: The first support seat (2) is provided with four gears (3) corresponding to the positions of the four hooks, each gear (3) is provided with a blocking rod (4), and the second support seat (5) is provided with four racks (6), and the position of a single rack (6) corresponds to a single gear (3).

8. The anti-unhooking device for a crane according to any one of claims 1 to 7, characterized in that: The reset member (7) is a spring.

Images