Steel claw, grab bucket and steel grabbing device

Abstract

The utility model relates to a steel claw, grab bucket and gripping device for gripping irregular waste material or raw material, wherein the steel claw comprises gripping teeth, tooth sleeve, bolt part and tight fit lock pin, through the specific setting of the structure of each part and the matching relationship among the parts, the gripping teeth can grip the irregular waste material or raw material under the matching of the bolt part and the tight fit lock pin. The grabbing teeth are detachably arranged in the tooth sleeve in a tight fit mode, after the grabbing teeth are abraded or damaged, the grabbing teeth can be detached and replaced with new grabbing teeth only by rotating the bolt component to revoke the tight fit relation, and due to the specifically-arranged tight fit mode, the grabbing teeth and the tooth sleeve are kept at the same position all the time in the using process, and the grabbing teeth are convenient to use. Therefore, the situation that parts are abraded due to the fact that the mutual positions are slightly changed in the using process is avoided, and the overall using durability of the grab bucket and the steel grabbing device is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial machinery accessories, and particularly relates to a steel claw, a grab bucket and a steel grabbing device. Background Art

[0002] Steel grabbing devices, commonly known as steel grabbers, are devices that use a grab bucket to grab, transport, and load and unload heavy objects such as steel. The grab bucket typically includes multiple grab arms (i.e., the grab body), each with a steel claw at the end. These multiple grab arms act like human hands, gripping the heavy object to be grabbed and then transporting or loading and unloading it. The steel claws of the grab arms experience long-term contact with the heavy object, generating significant friction and pressure. This friction causes the claws to wear very easily. Conventional methods typically attach the steel claws to the grab arms by welding. Once worn, the damaged claws must be sawed off and replaced by welding. This consumes significant manpower, material resources, and time, significantly reducing on-site work efficiency.

[0003] Chinese invention patent publication CN118324022A discloses a grab bucket for a steel grabbing machine, in which the grab bucket and steel claws are integrated without separately provided detachable steel claws. If the bottom of the grab bucket is worn, the grab bucket needs to be replaced as a whole, which consumes a lot of manpower and material resources and causes waste.

[0004] There is also a technical solution in the prior art to fix the steel claw to the grab arm through a pin shaft, but such a setting will cause the pin shaft to slowly wear out during use, resulting in an unstable connection between the steel claw and the grab arm, thereby causing unstable work and safety hazards. Utility Model Content

[0005] In view of the above technical problems, the purpose of the present invention is to provide a detachable steel claw, a grab bucket and a steel grabbing device, and the grabbing teeth of the steel claw can achieve a tight fit with the steel claw tooth sleeve at all times.

[0006] The purpose of this utility model is achieved through the following technical means:

[0007] A steel claw comprises a grabbing tooth, a tooth sleeve, a bolt component and a tight-fitting locking pin.

[0008] The grabbing tooth includes a tooth tip and a tight-fitting portion, wherein the tooth tip is the working end of the grabbing tooth, and the wider end of the tooth tip is fixedly connected to the tight-fitting portion. The upper end face and the lower end face of the tight-fitting portion are both arc-shaped surfaces, and the smallest cross-sectional area of ​​the tight-fitting portion is not at the two end portions.

[0009] The gear sleeve includes a tight-fitting opening portion and a locking opening portion, the inner top end surface and the inner bottom end surface of the tight-fitting opening portion are both arc-shaped surfaces, and the shortest distance between the inner top end surface and the inner bottom end surface of the tight-fitting opening portion is not at the two end portions, and the locking opening portion includes an accommodating opening portion and a screw hole.

[0010] The tight-fitting locking pin includes a semi-crescent arc portion and a U-shaped locking portion. The semi-crescent arc portion is used to extend into the tight-fitting opening portion of the tooth sleeve and perform a press fit with the tight-fitting portion of the grabbing tooth. The U-shaped locking portion is used to perform a locking operation through a bolt component.

[0011] The bolt component includes a pear-shaped screw and a stepped nut, the stepped nut is provided with an internal thread, the pear-shaped screw is provided with an external thread, the internal thread and the external thread are matched with each other, the stepped nut includes a tightening portion and a stepped portion, the outer wall of the tightening portion is a polygonal structure (for example, a cross-section is rectangular, pentagonal, hexagonal or octagonal, etc.), which is used to rotate the stepped nut through an external tightening component, the stepped portion sequentially includes a first step, a second step and a third step, the first step is fixedly connected to the tightening portion, and the diameter of the first step is D1, the diameter of the second step is D2, and the diameter of the third step is D3, satisfying D1>D3>D2, and the second step is used to accommodate the U-shaped locking portion.

[0012] Preferably, the steel claw also includes a rubber cover, which is used to cover the outside of the step nut. The rubber cover is provided with a bottom opening, and the shape of the bottom opening matches the shape of the tightening part of the step nut. The bottom opening is used to surround the tightening part of the step nut.

[0013] Preferably, the tooth tip is a structure with one end being sharp and the other end being wide, and the cross-sectional area gradually extends and expands from the sharp end to the wide end.

[0014] Preferably, the tooth tip portion further includes an accommodating opening, and the accommodating opening is provided at the connection between the tooth tip portion and the tight-fitting portion.

[0015] Preferably, the U-shaped locking portion that fits the locking pin tightly includes a U-shaped opening portion and a U-shaped bottom end. The longitudinal cross-section of the crescent arc portion is crescent-shaped, and the wider end of the crescent shape is connected to the U-shaped bottom end of the U-shaped locking portion. The opening width of the U-shaped opening portion is L, satisfying D3>L>D2.

[0016] Preferably, the tooth tip portion and the tight-fitting portion of the grabbing tooth are an integrally formed structure, and the crescent arc portion and the U-shaped locking portion of the tight-fitting locking pin are an integrally formed structure.

[0017] Preferably, the pear-shaped screw of the bolt component includes a threaded portion, a polygonal portion (such as a triangle, quadrilateral, pentagon, hexagon, etc. with an arc-shaped cross-section) and a truncated cone body portion in sequence, the threaded portion is a cylinder with an external thread provided on the outside, and the upper bottom surface of the truncated cone body portion is connected to the polygonal portion; the bottom end of the screw hole in the locking opening of the gear sleeve is provided with an inner polygonal structure that cooperates with the polygonal portion.

[0018] A grab bucket comprises a plurality of grab bucket arms and a plurality of steel claws. The steel claws are the above-mentioned steel claws, and the number of the grab bucket arms and the steel claws is the same. The grab bucket arms are fixedly connected to the tooth sleeves of the steel claws.

[0019] Preferably, the fixing is welding.

[0020] A steel grabbing device comprises the grab bucket mentioned above.

[0021] The range limitations such as "up", "down", "left", "right", "front", "back", and "center" described in the present invention are relative positions under specific conditions, rather than absolute positions, and do not limit the range of devices and components.

[0022] The technical effects of the utility model are:

[0023] 1. The utility model sets a tight-fitting structure in the grab bucket of the steel grabbing device, and cooperates with the semi-crescent arc portion of the tight-fitting locking pin and the U-shaped locking portion. Since the semi-crescent arc portion is a semi-crescent structure, that is, a structure in which the arc gradually becomes thicker, the semi-crescent arc portion can be completely locked with the tight-fitting portion of the grabbing tooth and the tight-fitting opening portion of the tooth sleeve at all times under the tightening operation of the bolt component to achieve real-time tight fit. During assembly or operation, if it is found that there is no tight fit, the semi-crescent arc portion can be further inserted between the tight-fitting portion of the grabbing tooth and the tight-fitting opening portion of the tooth sleeve by further tightening the stepped nut, thereby achieving real-time tight fit.

[0024] 2. The present invention sets a stepped nut with three steps, thereby limiting the U-shaped locking part at the second step, so that the tight-fitting locking pin and the stepped nut can form a loose but mutually coordinated connection relationship regardless of the tightening process or the loosening process. During the tightening process, downward pressure can be applied to the U-shaped locking part through the first step, thereby ensuring that the semi-crescent arc portion is always deep between the tight-fitting part of the grabbing tooth and the tight-fitting opening part of the tooth sleeve. When loosening is required, upward pressure is applied to the U-shaped locking part through the third step, but the U-shaped locking part does not disengage from the stepped nut during the process, so that the grabbing tooth can be removed before the tight-fitting locking pin is completely disengaged from the tooth sleeve, thereby improving reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of the assembled steel claws according to one embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of the explosion structure of the steel claw in one embodiment of the utility model.

[0027] Figure 3 This is a schematic diagram of the three-dimensional structure of a gear sleeve according to one embodiment of the present invention.

[0028] Figure 4 This is a left-side structural schematic diagram of a gear sleeve according to one embodiment of the present invention.

[0029] Figure 5 This is a schematic top view of the gear sleeve according to one embodiment of the present invention.

[0030] Figure 6 This is a schematic diagram of the three-dimensional structure of a gear sleeve according to an embodiment of the present invention when viewed from above.

[0031] Figure 7 This is a schematic cross-sectional structural diagram of a gear sleeve according to one embodiment of the present invention.

[0032] Figure 8 This is a structural schematic diagram of a pear-shaped screw according to one embodiment of the present invention.

[0033] Figure 9 This is a schematic structural diagram of a step nut according to one embodiment of the present invention.

[0034] Figure 10 This is a schematic diagram of the three-dimensional structure of a tight-fitting lock pin according to one embodiment of the present invention.

[0035] Figure 11 This is a schematic top view of the tight-fitting locking pin according to one embodiment of the present invention.

[0036] Figure 12 This is a side structural schematic diagram of a tight-fitting lock pin according to one embodiment of the present invention.

[0037] Figure 13 This is a schematic diagram of the three-dimensional structure of a grabbing tooth according to one embodiment of the present utility model.

[0038] Figure 14 This is a schematic diagram of the top structure of a grabbing tooth in one embodiment of the utility model.

[0039] Figure 15 This is a side structural schematic diagram of a grabbing tooth according to one embodiment of the present utility model.

[0040] Figure 16 This is a schematic diagram of the three-dimensional structure of a rubber cover according to one embodiment of the present invention.

[0041] Figure 17 This is a schematic cross-sectional structural diagram of the assembled steel claws according to one embodiment of the present invention.

[0042] Figure 18 The present invention is a schematic structural diagram of a grab bucket according to one embodiment of the present invention.

[0043] in:

[0044] 100 - grabbing tooth; 101 - tooth tip; 111 - receiving opening; 102 - tight fitting portion; 121 - upper end surface; 122 - lower end surface;

[0045] 200-gear sleeve; 201-tight fitting opening; 211-inner top end surface; 212-inner bottom end surface; 202-locking opening; 221-accommodating opening; 222-screw hole;

[0046] 300-bolt component; 301-pear-shaped screw; 311-threaded portion; 312-polygonal portion; 313-truncated cone body; 302-step nut; 321-tightening portion; 322-step portion; 3221-first step; 3222-second step; 3223-third step;

[0047] 400-tight fitting locking pin; 401-semi-crescent arc portion; 402-U-shaped locking portion; 421-U-shaped opening portion; 422-U-shaped bottom end;

[0048] 500-rubber cover; 501-bottom opening;

[0049] 600-Grab arm.

[0050] To distinguish them, the spline curve in the number label of the part in the figure represents a component including multiple parts, and the straight line in the number label represents the specific part of each component. DETAILED DESCRIPTION

[0051] The following further illustrates the process and technical solutions of the present invention by combining examples and accompanying drawings. Unless otherwise specified, each feature is merely an example of a series of equivalent or similar features. These examples are provided solely to facilitate understanding of the present invention, and those skilled in the art should understand that they are intended solely to facilitate understanding of the present invention and should not be construed as limiting the present invention.

[0052] Example 1

[0053] This embodiment Figures 1 to 17 FIG. 1 shows a steel claw in one embodiment.

[0054] like Figure 1 、 Figure 2 and Figure 17 As shown, the steel claw includes a grab tooth 100 , a tooth sleeve 200 , a bolt component 300 and a tight-fitting locking pin 400 .

[0055] As a further description, Figure 13 、 Figure 14 and Figure 15 As shown, the grab tooth 100 includes a tooth tip 101 and a tight fit portion 102. The tooth tip 101 is the working end of the grab tooth. The working end means that when the grab bucket is working, the main contact point between the steel claw and the object to be grabbed is the tooth tip 101 of the grab tooth. The wider end of the tooth tip is fixedly connected to the tight fit portion. The upper end face 121 and the lower end face 122 of the tight fit portion 102 are both arc-shaped surfaces, and the smallest cross-sectional area of ​​the tight fit portion is not at the two end portions. The meaning of "the smallest cross-sectional area of ​​the tight fit portion is not at the two end portions" is as follows: Figure 15 As shown, the shortest distance between the upper end face and the lower end face in the vertical direction is not at the two end parts, but at the part between the two end parts. It may be the middle part or not, but it must not be at the two end parts. This arrangement ensures that the grab teeth will not fall off when locked to form a tight fit.

[0056] As a further description, Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, the gear sleeve 200 includes a tight-fitting opening portion 201 and a locking opening portion 202. The inner top end surface 211 and the inner bottom end surface 212 of the tight-fitting opening portion 201 are both arc-shaped surfaces, and the shortest distance between the inner top end surface 211 and the inner bottom end surface 212 of the tight-fitting opening portion 201 is not at the two end portions. Here, the meaning of "the shortest distance between the inner top end surface 211 and the inner bottom end surface 212 is not at the two end portions" is as follows Figure 7 As shown, the shortest distance between the inner top end surface 211 and the inner bottom end surface 212 in the vertical direction is not at the two ends, but at the position between the two ends. It can be the middle position or not the middle position, but it must not be at the two ends. This arrangement ensures that the grab teeth will not fall off when the locking is formed into a tight fit; the locking opening portion 202 includes an accommodating opening portion 221 and a screw hole 222.

[0057] As a further description, Figure 10 、 Figure 11 and Figure 12As shown, the tight-fitting locking pin 400 includes a semi-crescent arc portion 401 and a U-shaped locking portion 402. The tight-fitting locking pin is sometimes also called a crescent lock. The semi-crescent arc portion 401 is used to extend into the tight-fitting opening portion 201 of the tooth sleeve 200 and to be press-fitted with the tight-fitting portion 102 of the grabbing tooth 100. The U-shaped locking portion 402 is used to perform a locking operation through the bolt component 300.

[0058] As a further description, Figure 8 and Figure 9 As shown, the bolt component 300 includes a pear-shaped screw 301 and a stepped nut 302, the stepped nut 302 is provided with an internal thread, and the pear-shaped screw 301 is provided with an external thread, the internal thread and the external thread are matched with each other, the stepped nut 302 includes a tightening portion 321 and a stepped portion 322, the outer wall of the tightening portion 321 is a polygonal structure, which is used to rotate the stepped nut 302 through an external tightening component, the stepped portion 322 sequentially includes a first step 3221, a second step 3222 and a third step 3223, the first step 3221 is fixedly connected to the tightening portion 321, and the diameter of the first step 3221 is D1, the diameter of the second step 3222 is D2, and the diameter of the third step 3223 is D3, satisfying D1>D3>D2, and the second step 3222 is used to accommodate the U-shaped locking portion 402. There is no limitation on the diameter of each step, only the size relationship between the three steps is limited. They can be adjusted according to the tonnage of the actual steel grasping device. For example, D1 can be set to 30 cm, D2 can be set to 20 cm, and D3 can be set to 26 cm. This is just an example, not a limitation.

[0059] As a further description, Figure 16 and Figure 18 As shown, the steel claw also includes a rubber cover 500, which is used to cover the outside of the stepped nut 302. The rubber cover is provided with a bottom opening 501. The shape of the bottom opening 501 matches the shape of the tightening portion of the stepped nut 302. The bottom opening 501 is used to surround the tightening portion 321 of the stepped nut 302. The rubber cover 500 can protect the stepped nut from dust, prevent rotation, and limit its position.

[0060] As a further description, Figure 13 、 Figure 14 and Figure 15 As shown, the tooth tip 101 is a structure with a sharp end and a wide end, and the cross-sectional area gradually extends and expands from the sharp end to the other end. The sharp end is used to first contact the object to be grasped, and as the grab is engaged, the object is grasped and moved toward the wide end.

[0061] As a further description, Figure 1、 Figure 2 、 Figure 13 and Figure 14 As shown, the tooth tip portion 101 further includes an accommodating opening 111, and the accommodating opening 111 is provided at the connection between the tooth tip portion 101 and the tight fitting portion 102. Figure 13 As shown, the accommodating opening can be an arc-shaped opening, and the accommodating opening 111 is used to accommodate the semi-crescent arc-shaped portion 401 when the semi-crescent arc-shaped portion 401 of the tight-fitting locking pin 400 partially extends out from the tooth sleeve during the further tight fitting process, so as to avoid the situation in extreme cases where the semi-crescent arc-shaped portion 401 needs to continue to be screwed to tightly fit the locking pin 400 and further penetrate the semi-crescent arc-shaped portion 401 between the tooth sleeve and the grabbing tooth due to possible wear, thereby ensuring that tight fitting can be achieved under any circumstances.

[0062] As a further description, Figure 10 、 Figure 11 and Figure 12 As shown, the U-shaped locking portion 402 that fits tightly against the locking pin 400 includes a U-shaped opening 421 and a U-shaped bottom 422. The longitudinal cross-section of the crescent-shaped arc portion 401 is crescent-shaped, and the wider end of the crescent is connected to the U-shaped bottom 422 of the U-shaped locking portion 402. The opening width of the U-shaped opening 421 is L, satisfying D3>L>D2. This size relationship allows the U-shaped opening to be inserted outside the second step, while at the same time being blocked by the first and third steps, thereby achieving efficient linkage. Here, L can be, for example, 21 cm, which is only an example and not a limitation.

[0063] As a further description, Figure 13 、 Figure 14 and Figure 15 As shown, the tooth tip portion 101 and the tight fitting portion 102 of the grabbing tooth 100 are an integrally formed structure. Figure 10 、 Figure 11 and Figure 12 As shown, the half-crescent arc portion 401 and the U-shaped locking portion 402 that tightly fit the locking pin 400 are an integrally formed structure. In other embodiments, welding or other fixing methods can be used.

[0064] As a further description, Figure 8 and Figure 9As shown, the pear-shaped screw 301 of the bolt component 300 sequentially comprises a threaded portion 311, a polygonal portion 312, and a conical body portion 313. The threaded portion 311 is cylindrical with external threads, and the upper bottom surface of the conical body portion 313 is connected to the polygonal portion 312. The bottom end of the screw hole 222 of the locking opening 202 of the gear sleeve 200 is provided with an inner polygonal structure that mates with the polygonal portion. This arrangement prevents the pear-shaped screw 301 from rotating at any time when locked.

[0065] Example 2

[0066] This embodiment Figure 18 As shown, a grab bucket and a steel grabbing device equipped with the steel claws shown in Example 1 are shown.

[0067] like Figure 18 As shown, the grab bucket and the steel grabbing device include a plurality of grab bucket arms 600 and a plurality of steel claws, the steel claws are the steel claws described in Example 1, and the number of the grab bucket arms 600 and the steel claws is the same, for example, in this embodiment Figure 18 The grab arm 600 is fixedly connected to the toothed sleeve 200 of the steel claw. This embodiment uses welding (the most preferred method), but other fixing methods can also be used in other embodiments.

[0068] During the assembly process of the devices of Example 1 and Example 2: Figure 2 As shown, first extend the tight-fitting portion of the grab tooth into the tight-fitting opening portion of the tooth sleeve, then insert the U-shaped locking portion of the tight-fitting locking pin into the second step of the step nut for clamping, and then move the tight-fitting locking pin as a whole to the locking opening portion of the tooth sleeve, extend the semi-crescent arc portion of the tight-fitting locking pin from the locking opening portion into the tight-fitting opening portion of the tooth sleeve, and insert the semi-crescent arc portion between the inner top end surface of the tight-fitting opening portion and the upper end surface of the tight-fitting portion of the grab tooth, and then insert the pear-shaped screw through the screw hole and tighten it with the step nut. As the step nut is tightened, the semi-crescent arc portion and the inner top end surface of the tight-fitting opening portion form a tight fit with the upper end surface of the tight-fitting portion of the grab tooth, and since the minimum area of ​​the cross-section of the tight-fitting portion is not at the two end portions and the shortest distance between the inner top end surface and the inner bottom end surface is not at the two end portions, the minimum connection point is not at the two ends, thereby ensuring that the grab tooth will not fall off or loosen under the premise of tight fit.

[0069] The known technologies in the art involved in this utility model are not described in detail. The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model shall be included in the scope of protection of the utility model.

Claims

1. A steel claw, characterized in that: It comprises a grabbing tooth (100), a tooth sleeve (200), a bolt component (300) and a tight-fitting locking pin (400); The grabbing tooth (100) comprises a tooth tip portion (101) and a tight fit portion (102), wherein the tooth tip portion (101) is the working end of the grabbing tooth, and the wider end of the tooth tip portion is fixedly connected to the tight fit portion. The upper end surface (121) and the lower end surface (122) of the tight fit portion (102) are both arc-shaped surfaces, and the smallest cross-sectional area of ​​the tight fit portion is not at the two end portions. The gear sleeve (200) includes a tight-fitting opening portion (201) and a locking opening portion (202); the inner top end surface (211) and the inner bottom end surface (212) of the tight-fitting opening portion (201) are both arc-shaped surfaces, and the shortest distance between the inner top end surface (211) and the inner bottom end surface (212) of the tight-fitting opening portion (201) is not at the two end portions; the locking opening portion (202) includes an accommodating opening portion (221) and a screw hole (222); The tight-fitting locking pin (400) comprises a semi-crescent arc portion (401) and a U-shaped locking portion (402), wherein the semi-crescent arc portion (401) is used to extend into the tight-fitting opening portion (201) of the tooth sleeve (200) and to be press-fitted with the tight-fitting portion (102) of the grabbing tooth (100), and the U-shaped locking portion (402) is used to perform a locking operation through the bolt component (300); The bolt component (300) includes a pear-shaped screw (301) and a stepped nut (302), wherein the stepped nut (302) is provided with an internal thread, and the pear-shaped screw (301) is provided with an external thread, wherein the internal thread and the external thread are matched with each other, and the stepped nut (302) includes a tightening portion (321) and a stepped portion (322), wherein the outer wall of the tightening portion (321) is a polygonal structure, and is used to rotate the stepped nut (302) through an external tightening component, and the stepped portion (322) is provided with an external thread. The ladder portion (322) includes a first step (3221), a second step (3222) and a third step (3223) in sequence. The first step (3221) is fixedly connected to the tightening portion (321), and the diameter of the first step (3221) is D1, the diameter of the second step (3222) is D2, and the diameter of the third step (3223) is D3, satisfying D1>D3>D2. The second step (3222) is used to accommodate the U-shaped locking portion (402).

2. The steel claw according to claim 1, characterized in that The steel claw further includes a rubber cover (500) for covering the outside of the step nut (302). The rubber cover is provided with a bottom opening (501), and the shape of the bottom opening (501) matches the shape of the tightening portion of the step nut (302). The bottom opening (501) is used to surround the tightening portion (321) of the step nut (302).

3. The steel claw according to claim 1, characterized in that The tooth tip portion (101) is a structure with a sharp end and a wide end, and a cross-sectional area gradually extending from the sharp end and expanding to the wide end.

4. The steel claw according to claim 1 or 3, characterized in that: The tooth tip portion (101) further comprises an accommodating opening (111), and the accommodating opening (111) is arranged at the connection between the tooth tip portion (101) and the tight-fitting portion (102).

5. The steel claw according to claim 1, characterized in that: The U-shaped locking portion (402) tightly fitting the locking pin (400) comprises a U-shaped opening portion (421) and a U-shaped bottom end (422); the longitudinal section of the crescent arc portion (401) is crescent-shaped, and the wider end of the crescent is connected to the U-shaped bottom end (422) of the U-shaped locking portion (402); the opening width of the U-shaped opening portion (421) is L, satisfying D3>L>D2.

6. The steel claw according to claim 1 or 5, characterized in that: The tooth tip portion (101) and the tight-fitting portion (102) of the grabbing tooth (100) are an integrally formed structure, and the crescent arc portion (401) and the U-shaped locking portion (402) of the tight-fitting locking pin (400) are an integrally formed structure.

7. The steel claw according to claim 1, characterized in that The pear-shaped screw (301) of the bolt component (300) includes a threaded portion (311), a polygonal portion (312) and a truncated cone body (313) in sequence. The threaded portion (311) is a cylindrical body with an external thread provided on the outside. The upper bottom surface of the truncated cone body (313) is connected to the polygonal portion (312). The bottom end of the screw hole (222) of the locking opening (202) of the gear sleeve (200) is provided with an inner polygonal structure that matches the polygonal portion.

8. A grab bucket, characterized in that: The invention comprises a plurality of grab arms (600) and a plurality of steel claws, wherein the steel claws are the steel claws according to any one of claims 1 to 7, and the number of the grab arms (600) and the steel claws is the same, and the grab arms (600) are fixedly connected to the tooth sleeves (200) of the steel claws.

9. The grab bucket according to claim 8, characterized in that: The fixing is welding.

10. A steel grasping device, characterized in that: The steel grabbing device comprises the grab bucket according to any one of claims 8 or 9.

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