An automatic hook release device for a crane

Abstract

The present invention discloses an automatic hook - releasing device for a crane, which comprises a mounting plate and a hook handle. In the middle of the upper end of the mounting plate, a suspension rod is fixedly installed. At the lower end of the mounting plate, two symmetrically - arranged mounting brackets are fixedly installed front and back. The mounting brackets are of a U - shaped structure. Inside the mounting brackets, an arc - shaped plate and a cross - plate are fixedly installed in sequence from top to bottom. The mounting plate, the mounting brackets, the arc - shaped plate and the cross - plate are integrally structured. In the middle - right part of the front end of the arc - shaped plate, an arc - shaped groove penetrating through from front to back is formed. The hook handle is located between the two mounting brackets. At the lower end of the hook handle, a hook head is fixedly installed. A gravity self - locking mechanism is arranged on the lower side of the inner wall of the hook head. The hook handle has a structure that is wider at the top and narrower at the bottom. The automatic hook - releasing device for a crane according to the present invention realizes the function of preventing hook release through the setting of the gravity self - locking mechanism, realizes self - locking by using the self - gravity of the lifted heavy object, is safe and reliable, realizes the automatic hook - releasing function by using gravity in cooperation with the gravity self - locking mechanism, has a compact structure and strong safety performance.

Description

Technical Field

[0001] The present invention relates to the technical field of cranes, and particularly to an automatic hook - releasing device for cranes. Background Technique

[0002] The hook is one of the essential components of lifting machinery. According to its shape, the hook can be divided into a single hook and a double hook; according to the manufacturing method, it can also be divided into a forged hook and a sheet - type hook. The single hook is convenient to manufacture and use, and is commonly used for lifting light objects; the double hook is used for lifting heavier objects. Generally, forged single hooks are mainly used for cranes with a lifting capacity of less than 30 tons, and double hooks are used for cranes with a lifting load between 50 tons and 100 tons; sheet - type single hooks are used for lifting 75 tons - 350 tons, and double hooks are used for cranes with a lifting load of more than 100 tons.

[0003] Hook rotation often occurs without any warning during the equipment hoisting operation. After the lifting machinery hoists a heavy object, the hook rotates, and the steel wire rope wound between the hook and the top pulley group of the boom gets twisted together, and the lifted heavy object also rotates with the hook. At this time, it is no longer possible to continue hoisting or lowering the lifted heavy object. Hook rotation will affect the normal progress of the hoisting operation and seriously threaten the safety of operators and equipment. Therefore, an anti - hook - releasing insurance device must be set to avoid accidents. In actual on - site operations, to improve the hoisting efficiency, the hook needs to have an automatic hook - releasing function. Therefore, we propose an automatic hook - releasing device for cranes that combines the functions of preventing hook release and automatic hook release. Summary of the Invention

[0004] The main purpose of the present invention is to provide an automatic hook - releasing device for cranes, which can effectively solve the problems in the background technique.

[0005] To achieve the above - mentioned purpose, the technical solution adopted by the present invention is as follows:

[0006] An automatic hook - releasing device for a crane, comprising a mounting plate and a hook handle. In the middle of the upper end of the mounting plate, a suspension rod is fixedly installed. At the lower end of the mounting plate, two symmetrically - arranged front - and - rear mounting brackets are fixedly installed. The mounting brackets are in a U - shaped structure. Inside the mounting brackets, an arc - shaped plate and a transverse plate are fixedly installed in sequence from top to bottom. The mounting plate, the mounting brackets, the arc - shaped plate and the transverse plate are integrally structured. In the middle - right part of the front end of the arc - shaped plate, an arc - shaped groove penetrating through the front and rear is opened. The hook handle is located between the two mounting brackets. At the lower end of the hook handle, a hook head is fixedly installed. A gravity self - locking mechanism is arranged on the lower side of the inner wall of the hook head. The hook handle has a structure that is wider at the top and narrower at the bottom. On the upper parts of the front end and the rear end of the hook handle, counterweight blocks are fixedly installed. On the mutually - remote ends of the two counterweight blocks, limit rods are fixedly installed. The two limit rods are respectively slidably connected with the two arc - shaped grooves. In the middle of the hook handle, a rotating shaft is inserted and movably connected through a bearing. The front end and the rear end of the rotating shaft are respectively movably connected with the two transverse plates. On the upper end of the hook head, a slope is arranged, and the slope is higher than the lower end surface of the mounting bracket.

[0007] Preferably, the gravity self - locking mechanism comprises a mounting block. The mounting block is embedded in the lower - side inner wall of the hook head. On the upper end of the mounting block, a horizontal sliding groove is opened. On the lower wall of the horizontal sliding groove, a vertical sliding groove is opened. On the lower wall of the vertical sliding groove, a mounting groove is opened. In the horizontal sliding groove, two horizontally - arranged pressure blocks are arranged. The two horizontally - arranged pressure blocks are symmetrically distributed left and right. Between the two horizontally - arranged pressure blocks, a vertically - arranged pressure block is jointly arranged. The lower part of the vertically - arranged pressure block is located in the vertical sliding groove. At the lower end of the vertically - arranged pressure block, a plurality of return springs are fixedly installed. The lower ends of the plurality of return springs are respectively fixedly connected with the lower wall of the mounting groove.

[0008] Preferably, the length of the horizontal sliding groove is greater than the length of the vertical sliding groove, the length of the vertical sliding groove is greater than the length of the mounting groove, and the widths of the horizontal sliding groove, the vertical sliding groove and the mounting groove are equal.

[0009] Preferably, on the front wall and the rear wall of the horizontal sliding groove, two symmetrically - arranged left - and - right horizontal limiting grooves are opened. In the middle of the front end and the rear wall of the horizontal sliding groove, vertical limiting grooves are opened. The lower ends of the vertical limiting grooves extend into the vertical sliding groove.

[0010] Preferably, the vertically - arranged pressure block has an isosceles trapezoid structure. On the front end and the rear end of the vertically - arranged pressure block, vertically - arranged limiting blocks are fixedly installed. In the middle of the upper end of the vertically - arranged pressure block, a recessed part is opened. On the upper end of the vertically - arranged pressure block, two fitting grooves are opened. The two fitting grooves are symmetrically distributed left and right with the recessed part as the center. On the left - hand slope and the right - hand slope of the vertically - arranged pressure block, two symmetrically - arranged front - and - rear inclined sliding grooves are opened.

[0011] Preferably, horizontal limit blocks are fixedly installed at both the front end and the rear end of the horizontal pressure block. Two inclined sliders are fixedly installed on the inclined surface of one end of the horizontal pressure block close to the vertical pressure block. The inclined sliders are slidably connected to inclined chutes. A lock plate is fixedly installed at the upper end of the horizontal pressure block, and the lock plate is in an arc structure.

[0012] Preferably, the vertical limit block is slidably connected to the vertical limit groove, and the fitting groove is matched with the lock plate.

[0013] Preferably, the horizontal limit block is slidably connected to the horizontal limit groove.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. In the present invention, the function of preventing the hook from disengaging is realized by setting a gravity self-locking mechanism. During hoisting, the rope of the heavy object to be hoisted is hung on the recessed part in the vertical pressure block. As the heavy object is gradually hoisted, the vertical pressure block moves downward under force and squeezes the two horizontal pressure blocks. After the two horizontal pressure blocks are compressed, they perform synchronous relative movements. The two horizontal pressure blocks respectively drive a lock plate to perform synchronous relative movements. When the heavy object is completely hoisted, the two lock plates are in close contact with each other, restricting the rope within the gap formed by the two. And as long as the vertical pressure block is always under force, the two lock plates will remain in close contact, effectively preventing the rope from detaching from the hook head. The entire device realizes self-locking with the self-weight of the heavy object to be hoisted, which is safe and reliable.

[0016] 2. In the present invention, the function of automatic hook detachment is realized by utilizing gravity in cooperation with the gravity self-locking mechanism. When the heavy object to be hoisted lands, the vertical pressure block comes into contact with force and moves upward under the elastic force of the return spring. At the same time, the vertical pressure block drives the two horizontal pressure blocks to perform synchronous opposite movements, and the two horizontal pressure blocks drive the two lock plates to perform synchronous opposite movements until the vertical pressure block returns to its initial position. At this time, the two lock plates are just respectively located in the two fitting grooves, preventing the rope from getting stuck in the gap between the lock plate and the vertical pressure block. At this time, the rope is completely exposed in the recessed part. At the same time, by setting a counterweight block and a hook handle with a unique shape, the weight of the upper part of the entire hook handle is much greater than the weight of the hook head. Affected by gravity, the hook handle rotates around the rotation axis, throwing out the rope in the hook head.

[0017] 3. In the present invention, by setting an installation frame, the opening of the hook head is located inside the installation frame. When hoisting a heavy object, the amplitude of the rope swing will be restricted by the lower end of the installation frame when the rope swings, further preventing the situation of the rope from detaching from the hook. And when the hook detaches, the rope will also quickly pass through the slope and detach from the hook head under the restriction of the lower end surface of the installation frame.

[0018] 4. In the present invention, by providing an installation plate and an installation frame to form a structure similar to a protective cover, it is avoided that the hook handle and the hook head are entangled by ropes and cannot rotate normally. Then, by providing an arc-shaped plate, an arc groove and a limiting rod, when the hook is disengaged, the hook handle can only rotate towards the opening direction of the hook head under the action of gravity, better realizing the automatic hook disengagement function. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of an automatic hook disengagement device for a crane according to the present invention;

[0020] Figure 2 is an effect diagram of automatic hook disengagement of an automatic hook disengagement device for a crane according to the present invention;

[0021] Figure 3 is a schematic diagram of the overall structure of the hook handle of an automatic hook disengagement device for a crane according to the present invention;

[0022] Figure 4 is a schematic diagram of the overall structure of the installation plate of an automatic hook disengagement device for a crane according to the present invention;

[0023] Figure 5 is a schematic diagram of the overall structure of the hook head of an automatic hook disengagement device for a crane according to the present invention;

[0024] Figure 6 is a schematic diagram of the overall structure of the gravity self-locking mechanism of an automatic hook disengagement device for a crane according to the present invention;

[0025] Figure 7 is an effect diagram of the use of the gravity self-locking mechanism of an automatic hook disengagement device for a crane according to the present invention;

[0026] Figure 8 is a schematic cross-sectional structure diagram of the installation block of an automatic hook disengagement device for a crane according to the present invention;

[0027] Figure 9 is a schematic diagram of the overall structure of the vertical pressure block of an automatic hook disengagement device for a crane according to the present invention;

[0028] Figure 10 is a schematic diagram of the overall structure of the horizontal pressure block of an automatic hook disengagement device for a crane according to the present invention.

[0029] In the figure: 1, mounting plate; 2, mounting bracket; 3, arc plate; 4, arc groove; 5, cross plate; 6, suspension rod; 7, hook handle; 8, hook head; 9, gravity self-locking mechanism; 10, counterweight; 11, limiting rod; 12, rotating shaft; 13, slope; 21, mounting block; 22, mounting groove; 23, vertical sliding groove; 24, horizontal sliding groove; 25, vertical pressure block; 26, horizontal pressure block; 27, return spring; 31, horizontal limiting groove; 32, vertical limiting groove; 41, vertical limiting block; 42, recessed part; 43, fitting groove; 44, inclined sliding groove; 51, horizontal limiting block; 52, inclined sliding block; 53, locking plate. Detailed implementation manners

[0030] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mount", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] Such as Figure 1-10As shown in the figure, an automatic hook - releasing device for a crane includes a mounting plate 1 and a hook handle 7. In the middle of the upper end of the mounting plate 1, a suspension rod 6 is fixedly installed. At the lower end of the mounting plate 1, two symmetrically - arranged front - and - rear mounting brackets 2 are fixedly installed. The mounting bracket 2 is in a U - shaped structure. Inside the mounting bracket 2, an arc - shaped plate 3 and a cross - plate 5 are fixedly installed in sequence from top to bottom. The mounting plate 1, the mounting bracket 2, the arc - shaped plate 3, and the cross - plate 5 are integrally structured. In the middle - right part of the front end of the arc - shaped plate 3, an arc - shaped groove 4 penetrating from front to back is opened. The hook handle 7 is located between the two mounting brackets 2. At the lower end of the hook handle 7, a hook head 8 is fixedly installed. On the lower side of the inner wall of the hook head 8, a gravity self - locking mechanism 9 is arranged. The hook handle 7 has a structure that is wider at the top and narrower at the bottom. On the upper parts of the front and rear ends of the hook handle 7, counterweight blocks 10 are fixedly installed. On the mutually - remote ends of the two counterweight blocks 10, limit rods 11 are fixedly installed. The two limit rods 11 are respectively slidably connected with the two arc - shaped grooves 4. In the middle of the hook handle 7, a rotating shaft 12 is inserted and movably connected through a bearing. The front and rear ends of the rotating shaft 12 are respectively movably connected with the two cross - plates 5. On the upper end of the hook head 8, a slope 13 is arranged, and the slope 13 is higher than the lower end face of the mounting bracket 2.

[0034] The gravity self - locking mechanism 9 includes a mounting block 21. The mounting block 21 is embedded in the lower - side inner wall of the hook head 8. On the upper end of the mounting block 21, a horizontal sliding groove 24 is opened. On the lower wall of the horizontal sliding groove 24, a vertical sliding groove 23 is opened. On the lower wall of the vertical sliding groove 23, a mounting groove 22 is opened. In the horizontal sliding groove 24, two horizontal pressure blocks 26 are arranged. The two horizontal pressure blocks 26 are symmetrically distributed left and right. Between the two horizontal pressure blocks 26, a vertical pressure block 25 is arranged. The lower part of the vertical pressure block 25 is located in the vertical sliding groove 23. At the lower end of the vertical pressure block 25, a plurality of return springs 27 are fixedly installed. The lower ends of the plurality of return springs 27 are all fixedly connected with the lower wall of the mounting groove 22. The return springs 27 are always in a compressed state. The setting of the mounting groove 22 prevents the return springs 27 from being damaged due to excessive extrusion. The vertical pressure block 25 can only move up and down in the vertical sliding groove 23, and the horizontal pressure block 26 can only move left and right in the horizontal sliding groove 24.

[0035] The length of the horizontal sliding groove 24 is greater than the length of the vertical sliding groove 23, and the length of the vertical sliding groove 23 is greater than the length of the mounting groove 22. The widths of the horizontal sliding groove 24, the vertical sliding groove 23, and the mounting groove 22 are all equal. When the left - hand horizontal pressure block 26 contacts the left wall of the horizontal sliding groove 24, the locking plate 53 is just located in the fitting groove 43. When the upper end surfaces of the horizontal pressure block 26 and the vertical pressure block 25 are flush, the two locking plates 53 just tightly contact each other.

[0036] On the front and rear walls of the horizontal sliding groove 24, two symmetrically - arranged left - and - right horizontal limiting grooves 31 are opened. In the middle of the front end and the rear wall of the horizontal sliding groove 24, vertical limiting grooves 32 are opened. The lower ends of the vertical limiting grooves 32 extend into the vertical sliding groove 23. When the two locking plates 53 contact each other, the lowest point of the recessed part 42 is just flush with the upper end face of the mounting block 21.

[0037] The vertical pressure block 25 has an isosceles trapezoid structure. Vertical limit blocks 41 are fixedly installed at both the front end and the rear end of the vertical pressure block 25. A recess 42 is formed in the middle of the upper end of the vertical pressure block 25. Two fitting grooves 43 are formed in the upper end of the vertical pressure block 25. The two fitting grooves 43 are symmetrically distributed left and right with the recess 42 as the center. Two obliquely symmetrically distributed oblique sliding grooves 44 are formed on both the left inclined surface and the right inclined surface of the vertical pressure block 25. The arrangement of the fitting grooves 43 facilitates the storage of the lock plate 53 and prevents the rope from moving into the gap between the lock plate 53 and the vertical pressure block 25.

[0038] Horizontal limit blocks 51 are fixedly installed at both the front end and the rear end of the horizontal pressure block 26. Two oblique sliding blocks 52 are fixedly installed on the inclined surface of one end of the horizontal pressure block 26 close to the vertical pressure block 25. The oblique sliding blocks 52 are slidably connected with the oblique sliding grooves 44. A lock plate 53 is fixedly installed at the upper end of the horizontal pressure block 26. The lock plate 53 has an arc structure. The two lock plates 53 just fit together.

[0039] The vertical limit block 41 is slidably connected with the vertical limit groove 32. The fitting groove 43 matches the lock plate 53.

[0040] The horizontal limit block 51 is slidably connected with the horizontal limit groove 31.

[0041] It should be noted that the present invention is an automatic hook - releasing device for a crane. The anti - unhooking function is achieved by setting a gravity self - locking mechanism 9. During hoisting, the rope of the heavy object to be hoisted is hung on the recess 42 in the vertical pressure block 25. As the heavy object is gradually lifted, the vertical pressure block 25 moves downward under the force and squeezes the two horizontal pressure blocks 26. After being pressed, the two horizontal pressure blocks 26 move synchronously relative to each other. Each of the two horizontal pressure blocks 26 drives a lock plate 53 to move synchronously relative to each other. When the heavy object is completely lifted, the two lock plates 53 are in close contact with each other, restricting the rope within the gap formed by the two. As long as the vertical pressure block 25 is continuously stressed, the two lock plates 53 will remain in close contact, effectively preventing the rope from detaching from the hook head 8. The entire device realizes self - locking with the self - weight of the heavy object to be hoisted, which is safe and reliable. The automatic hook - releasing function is achieved by utilizing gravity in cooperation with the gravity self - locking mechanism 9. When the heavy object to be hoisted lands, the vertical pressure block 25 comes into contact with the force and moves upward under the elastic force of the return spring 27. At the same time, the vertical pressure block 25 drives the two horizontal pressure blocks 26 to move synchronously away from each other, and the two horizontal pressure blocks 26 drive the two lock plates 53 to move synchronously away from each other until the vertical pressure block 25 returns to its initial position. At this time, the two lock plates 53 are just located in the two fitting grooves 43 respectively, preventing the rope from getting stuck in the gap between the lock plate 53 and the vertical pressure block 25. At this time, the rope is completely exposed in the recess 42. Meanwhile, by setting the counterweight 10 and the hook handle 7 with a unique shape, the upper part of the entire hook handle 7 is much heavier than the hook head 8. Affected by gravity, the hook handle 7 rotates around the rotation axis 12, throwing out the rope in the hook head 8. By setting the mounting bracket 2, the opening of the hook head 8 is located inside the mounting bracket 2. When hoisting a heavy object, the amplitude of the rope swing will be restricted by the lower end of the mounting bracket 2 during the swing of the rope, further preventing the occurrence of rope unhooking. And when unhooking, the rope will also quickly pass through the slope 13 and detach from the hook head 8 under the restriction of the lower end face of the mounting bracket 2. By setting the mounting plate 1 and the mounting bracket 2 to form a structure similar to a protective cover, it is avoided that the hook handle 7 and the hook head 8 are entangled by the rope and cannot rotate normally. Then, by setting the arc - shaped plate 3, the arc groove 4 and the limiting rod 11, when unhooking, the hook handle 7 can only rotate in the opening direction of the hook head 8 under the action of gravity, better realizing the automatic hook - releasing function.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above - mentioned embodiments. What is described in the above - mentioned embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic hook - releasing device for a crane, comprising a mounting plate (1) and a hook shank (7), characterized in that: A suspension rod (6) is fixedly installed in the middle of the upper end of the mounting plate (1). Two symmetrically arranged mounting brackets (2) are fixedly installed at the lower end of the mounting plate (1). An arc-shaped plate (3) and a cross plate (5) are fixedly installed in the mounting bracket (2) in sequence from top to bottom. An arc groove (4) penetrating through from front to back is formed in the middle right part of the front end of the arc-shaped plate (3). The hook handle (7) is located between the two mounting brackets (2). A hook head (8) is fixedly installed at the lower end of the hook handle (7). A gravity self-locking mechanism (9) is arranged on the lower side of the inner wall of the hook head (8). The hook handle (7) has a structure that is wider at the top and narrower at the bottom. Counterweight blocks (10) are fixedly installed at the upper parts of the front end and the rear end of the hook handle (7). Limiting rods (11) are fixedly installed at the mutually remote ends of the two counterweight blocks (10). A rotating shaft (12) is inserted and movably connected to the middle of the hook handle (7) through a bearing. A slope (13) is arranged at the upper end of the hook head (8). The gravity self-locking mechanism (9) includes a mounting block (21). The mounting block (21) is embedded in the lower inner wall of the hook head (8). A horizontal sliding groove (24) is formed at the upper end of the mounting block (21). A vertical sliding groove (23) is formed in the lower wall of the horizontal sliding groove (24). A mounting groove (22) is formed in the lower wall of the vertical sliding groove (23). Two horizontal pressure blocks (26) are arranged in the horizontal sliding groove (24). The two horizontal pressure blocks (26) are symmetrically distributed left and right. A vertical pressure block (25) is jointly arranged between the two horizontal pressure blocks (26). The lower part of the vertical pressure block (25) is located in the vertical sliding groove (23). A plurality of reset springs (27) are fixedly installed at the lower end of the vertical pressure block (25). The lower ends of the plurality of reset springs (27) are fixedly connected to the lower wall of the mounting groove (22). The vertical pressure block (25) has an isosceles trapezoid structure. Vertical limiting blocks (41) are fixedly installed at the front end and the rear end of the vertical pressure block (25). A recessed part (42) is formed in the middle of the upper end of the vertical pressure block (25). Two fitting grooves (43) are formed at the upper end of the vertical pressure block (25). The two fitting grooves (43) are symmetrically distributed left and right with the recessed part (42) as the center. Two symmetrically arranged front and rear oblique sliding grooves (44) are formed on the left inclined surface and the right inclined surface of the vertical pressure block (25). Horizontal limiting blocks (51) are fixedly installed at the front end and the rear end of the horizontal pressure block (26). Two oblique sliding blocks (52) are fixedly installed on the inclined surface of the end of the horizontal pressure block (26) close to the vertical pressure block (25). The oblique sliding blocks (52) are slidably connected to the oblique sliding grooves (44). A lock plate (53) is fixedly installed at the upper end of the horizontal pressure block (26). The lock plate (53) has an arc-shaped structure.

2. The automatic hook release device for a crane according to claim 1, characterized in that: The mounting bracket (2) has a U-shaped structure; the mounting plate (1), the mounting bracket (2), the arc-shaped plate (3) and the cross plate (5) are integrally formed; the two limiting rods (11) are respectively slidably connected to the two arc-shaped grooves (4); the front end and the rear end of the rotating shaft (12) are respectively movably connected to the two cross plates (5); the slope surface (13) is higher than the lower end surface of the mounting bracket (2).

3. The automatic hook release device for a crane according to claim 2, characterized in that: The length of the transverse sliding groove (24) is greater than the length of the vertical sliding groove (23), the length of the vertical sliding groove (23) is greater than the length of the mounting groove (22), and the widths of the transverse sliding groove (24), the vertical sliding groove (23) and the mounting groove (22) are equal.

4. The automatic hook release device for a crane according to claim 3, characterized in that: Two symmetrically arranged transverse limiting grooves (31) are formed in the front wall and the rear wall of the transverse sliding groove (24), vertical limiting grooves (32) are formed in the middle of the front end and the rear wall of the transverse sliding groove (24), and the lower ends of the vertical limiting grooves (32) extend into the vertical sliding groove (23).

5. The automatic hook release device for a crane according to claim 4, characterized in that: The vertical limiting block (41) is slidably connected to the vertical limiting groove (32), and the fitting groove (43) is matched with the locking plate (53).

6. The automatic hook - releasing device for a crane according to claim 5, wherein: The transverse limiting block (51) is slidably connected to the transverse limiting groove (31).

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