A bucket tooth, bucket head, bucket assembly and grab bucket body

Abstract

The application relates to the technical field of grab bucket equipment, in particular to a bucket tooth, a bucket head, a bucket assembly and a grab bucket body. The bucket tooth is applied to the bucket head of the grab bucket body, the bucket head is rotationally arranged, and has an open state and a closed state in the rotation process. The outer contour of the bucket tooth is a first arc surface, and the first included angle between the tangent line of the tip end of the bucket tooth and the horizontal plane is an acute angle or a right angle in the open state of the bucket head. Through the limitation of the first included angle, the bucket tooth can always maintain the best cutting angle in the closing process of the bucket head, the bucket tooth can directly cut into the rock surface, immediately produce a crushing effect, avoid the required sliding friction of the traditional outwardly inclined bucket tooth, thereby reducing the tip end wear of the bucket tooth and prolonging the service life, and improving the work efficiency.

Description

[0001] Cross-reference to related applications This application claims priority to Chinese Patent Application No. 202522290832.8, filed with the State Intellectual Property Office of China on October 29, 2025, entitled "A Bucket Tooth, Bucket Head, Bucket Assembly and Grab Bucket Body", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application generally relates to the field of grab bucket technology, and more specifically, to a bucket tooth, bucket head, bucket assembly, and grab bucket body. Background Technology

[0003] Existing grab buckets are convenient for construction in soft soil strata, and can successfully complete trench construction without the need for other equipment.

[0004] Current grab buckets generally use outward-sloping teeth, with the tooth tips opening outwards relative to the cutting edge. During the closing process, the trajectory of the tooth tips forms an obtuse angle with the ground surface. When encountering hard rock formations, the tooth tips initially slide and contact the rock surface with a negative rake angle, unable to cut in immediately. Only after rubbing against the surface for a certain distance can the effective cutting angle be gradually reached through continuous downward pressure from the grab bucket. This sliding process delays the tooth tip's entry, significantly reducing work efficiency and subjecting the tooth tips to severe wear, resulting in a significantly shortened lifespan. Utility Model Content

[0005] To solve the above-mentioned technical problems, this application provides a bucket tooth, a bucket head, a bucket assembly, and a grab bucket body.

[0006] To achieve the above objectives, this application adopts the following technical solution: In the first aspect, this application provides a bucket tooth applied to the bucket head of a grab bucket body, wherein the bucket head is rotatably configured and has an open state and a closed state during rotation; The outer contour of the bucket tooth is a first arc surface. When the bucket head is open, the first angle between the tangent of the first arc surface at the tip of the bucket tooth and the horizontal plane is an acute angle or a right angle.

[0007] According to one embodiment of this application, in the open state of the bucket head, the circle formed by the tip with the rotation center of the bucket head as the center is the trajectory circle, and the tangent on the tip of the trajectory circle forms a second included angle between the tangent on the tip and the tangent on the tip, the second included angle being less than or equal to 15 degrees.

[0008] According to one embodiment of this application, the inner contour of the bucket tooth is a second arc surface, and the concave direction of the second arc surface is the same as the concave direction of the first arc surface, so that the bucket tooth is crescent-shaped.

[0009] Secondly, this application also provides a bucket head, including the bucket teeth described above, and a jaw plate body. The jaw plate body is configured as a hollow box structure. The jaw plate body is rotatably mounted on the lower support beam of the grab bucket body to realize the opening and closing action of the bucket head. The bucket teeth are disposed on the front cutting edge of the jaw plate body.

[0010] According to one embodiment of this application, the jaw plate body includes an outer panel and an inner panel spaced apart, and the outer panel and the inner panel are connected by a sealing plate to form a hollow box structure. The hollow box is provided with at least one reinforcing rib, which is disposed on the outer panel, and / or on the inner panel, and / or between the inner panel and the outer panel.

[0011] According to one embodiment of this application, the reinforcing rib is arc-shaped, and the arc of the reinforcing rib is coaxially arranged with the rotation center of the jaw plate body.

[0012] According to one embodiment of this application, both the jaw plate body and the bucket teeth are made of structural steel.

[0013] Thirdly, this application also provides a bucket assembly, including a lower support beam and two bucket heads as described above. The two bucket heads are symmetrically arranged on both sides of the lower support beam and rotatably mounted on the lower support beam to form a double-jaw soil-grabbing structure that can be opened and closed synchronously.

[0014] According to one embodiment of this application, the jaw plate body is rotatably connected to the lower bearing beam via a rotating shaft, and the rotating shaft is fitted with a wear-resistant bushing.

[0015] Fourthly, this application also provides a grab bucket body, including an upper support beam and the bucket assembly described above, wherein the lower support beam is connected to the upper support beam.

[0016] As can be seen from the above technical solution, the advantages and positive effects of the bucket teeth, bucket head, bucket assembly and grab bucket body of this application are as follows: by setting the angle of the first included angle to an acute angle or a right angle, the tip of the bucket teeth can directly press against the rock surface when the bucket head is in the open state. It can also ensure that the bucket teeth can always maintain the best cutting angle during the bucket head closing process. The bucket teeth can directly cut into the rock surface and immediately produce a crushing effect, avoiding the sliding friction required by traditional outward-inclined bucket teeth, thereby reducing the wear of the bucket tooth tip and extending the service life, and also improving the working efficiency. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a perspective view of a bucket tooth according to an exemplary embodiment.

[0020] Figure 2 This is a side view of a bucket tooth according to an exemplary embodiment.

[0021] Figure 3 This is a schematic diagram of the structure of a bucket head according to an exemplary embodiment.

[0022] Figure 4 This is a perspective view of a bucket assembly according to an exemplary embodiment.

[0023] Figure 5 This is a schematic diagram of a bucket head in an open state, according to an exemplary embodiment.

[0024] Figure 6 This is a schematic diagram of a structure for representing a trajectory circle, according to an exemplary embodiment.

[0025] Figure 7 This is a schematic diagram of a structure for representing a second included angle, according to an exemplary embodiment.

[0026] Figure 8 This is a schematic diagram illustrating a structure for demonstrating a reinforcing rib, according to an exemplary embodiment.

[0027] The reference numerals in the attached figures are explained as follows: 1. Bucket teeth; 11. First arc surface; 12. Tip; 13. Track circle; 14. Second arc surface; 2. Jaw plate body; 21. Outer panel; 22. Inner panel; 23. Arc-shaped sealing plate; 3. Scraper; 31. Scraper blade; 32. Elastic connector; 33. Connecting rod; 4. Lower support beam; 5. Rotating shaft; 6. Wear-resistant bushing; 7. Reinforcing rib; 8. Weight reduction groove. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] Reference Figures 1-7 This embodiment provides a bucket tooth 1, which is applied to the bucket head of the grab bucket body. The bucket head is rotatable and has an open state and a closed state during rotation. The outer contour of the bucket tooth 1 is a first arc surface 11. When the bucket head is open, the first included angle A between the tangent of the first arc surface 11 at the tip 12 of the bucket tooth 1 and the horizontal plane is an acute angle or a right angle.

[0030] By setting the angle of the first included angle A to an acute angle or a right angle, the tip 12 of the bucket tooth 1 can directly press against the rock surface when the bucket head is in the open state. It can also ensure that the bucket tooth 1 can always maintain the best cutting angle during the bucket head closing process. The bucket tooth 1 can directly cut into the rock surface and immediately produce a crushing effect, avoiding the sliding friction required by the traditional outward tilting bucket tooth 1. This reduces the wear of the tip 12 of the bucket tooth 1 and extends its service life, while also improving work efficiency.

[0031] In some embodiments, when the bucket head is in the open state, the circle formed by the tip 12 with the rotation center of the bucket head as the center is called the trajectory circle 13, and the tangent on the tip 12 of the trajectory circle 13 forms a second included angle B between the tangent on the tip 12 and the tangent on the tip 12. Here, the trajectory circle 13 refers to the arc path drawn in space by the tip 12 of the bucket tooth 1 when it rotates around the pin of the lower support beam 4 of the grab bucket body.

[0032] The second included angle B is less than or equal to 15 degrees, meaning that the second included angle B can be between 0 degrees and 15 degrees. In some embodiments, the second included angle B can be 0 degrees, 3 degrees, 5 degrees, 8 degrees, 10 degrees, 12 degrees, or 15 degrees, etc. This ensures that the outer contour of the bucket tooth 1 remains approximately the same as the direction of movement of the tip 12 of the bucket tooth 1 at any instant. Therefore, the bucket tooth 1 maintains a constant and optimal cutting angle after cutting into the rock layer, thereby improving the directional consistency of the cutting force, reducing the frictional resistance between the bucket tooth 1 and the rock layer, reducing the impact load caused by angle changes, and thus reducing the risk of fatigue cracking at the root of the bucket tooth 1.

[0033] In traditional outward-inclined bucket teeth 1, a large gap forms between the tooth back and the rock stratum after cutting in, causing the rock cuttings to be repeatedly crushed and generating additional tangential resistance during the cutting process. In some embodiments, the inner contour of the bucket tooth 1 is a second arc surface 14, and the concave direction of the second arc surface 14 is the same as the concave direction of the first arc surface 11, making the bucket tooth 1 crescent-shaped. Therefore, after cutting into the rock stratum, the second arc surface 14 can closely adhere to the rock surface and guide the rock cuttings to slide upward along the second arc surface 14, realizing the inward flow of rock cuttings at the moment of cutting in, thereby reducing the accumulation of rock cuttings on the tooth back and thus reducing tangential resistance.

[0034] In some embodiments, the bucket teeth 1 are hollow, which reduces the weight of the bucket teeth 1, thereby reducing the weight of the grab bucket body, improving the flexibility and operational efficiency of the grab bucket body, and reducing energy consumption.

[0035] In summary, the bucket tooth 1 provided in this embodiment, through the combination of the first arc surface 11 and the second arc surface 14, enables the bucket tooth 1 to cut into the rock face at the front angle when the bucket head is open. The bucket head can form an effective crushing zone in the rock layer without additional downward stroke, thereby improving the overall operating efficiency. At the same time, the bucket tooth 1 can cut into the rock surface immediately without lateral sliding during the cutting process, and the surface temperature rise of the tip 12 of the bucket tooth 1 is reduced, thereby further extending the wear life of the bucket tooth 1.

[0036] Reference Figures 3-8 This embodiment also provides a bucket head, which includes a jaw plate body 2 and bucket teeth 1. The jaw plate body 2 is a hollow box structure. The jaw plate body 2 is rotatably mounted on the lower support beam 4 of the grab bucket body to realize the opening and closing action of the bucket head. The bucket teeth 1 are set on the front edge of the jaw plate body 2.

[0037] The lower support beam 4 of the grab bucket body serves as a load-bearing component and is rotatably connected to the jaw plate body 2. A hydraulic mechanism is also installed on the lower support beam 4, which drives the movement of the jaw plate body 2, thereby enabling the jaw plate body 2 to rotate relative to the lower support beam 4 and achieving the opening and closing action of the bucket head.

[0038] The leading edge of the jaw plate body 2 is located at the very front end of the jaw plate body 2, and is the transverse cutting edge that directly contacts the rock and soil and cuts into it first. By setting the bucket teeth 1 at the leading edge of the jaw plate body 2, it is ensured that the tip 12 of the bucket teeth 1 can convert the kinetic energy of the bucket head falling and closing into a concentrated pressing force on the rock strata with the shortest lever arm and the shortest path.

[0039] The jaw plate body 2, through the hollow box structure, allows the bucket head to reduce its own weight while ensuring structural strength. As a result, the bucket head inertia is reduced and the closing speed is increased, which enables the bucket teeth 1 to cut into the rock layer with higher kinetic energy and enhance the initial crushing effect.

[0040] In some embodiments, the tooth 1 includes a connected tooth body and a tooth seat. The tooth seat is used to connect to the jaw plate body 2, and the tooth body is used to cut the rock surface. The tooth seat and the jaw plate body 2 can be fixedly connected by methods such as welding, bonding, or interference fit with pins; alternatively, they can be detachably connected by methods such as bolts or embedded fits. In this embodiment, the tooth seat and the jaw plate body 2 are integrally cast or welded together, ensuring that the force on the jaw plate body 2 can be directly transmitted, reducing the risk of loosening.

[0041] Similarly, the tooth body can be fixedly or detachably connected to the tooth base. The specific connection structure can be as described above, or other methods found in the prior art. In this embodiment, a wedge-shaped channel is provided inside the tooth body, and an inverted conical cavity is provided inside the tooth base. A wedge pin is driven into the wedge-shaped channel, causing it to expand outwards, thereby achieving an interference fit and self-locking with the inverted conical cavity, thus realizing the connection. When disassembly is required, a special clamp, such as a pliers, can be used to pull out the wedge pin to complete the disassembly, eliminating the need for auxiliary hammering, enabling rapid replacement, reducing time costs, and ensuring operational efficiency.

[0042] Reference Figures 3-8 The jaw plate body 2 includes an outer panel 21 and an inner panel 22 spaced apart. The outer panel 21 and the inner panel 22 are connected by an arc-shaped sealing plate 23 to form a hollow box structure. At least one reinforcing rib 7 is provided inside the hollow box. The reinforcing rib 7 is located on the outer panel 21, and / or on the inner panel 22, and / or between the inner panel 22 and the outer panel 21. The reinforcing rib 7 further enhances the structural strength of the jaw plate body 2, ensuring the overall stability of the bucket head. It is understood that the reinforcing rib 7 can be one, two, or more depending on different application scenarios or usage requirements, and the placement of different reinforcing ribs 7 can also be adaptively selected.

[0043] Furthermore, with the bucket head open, the reinforcing rib 7 is inclined downwards so that the material inside the jaw plate body 2 slides down under its own weight. With the bucket head open and the reinforcing rib 7 inclined downwards, the soil entering the hollow box of the jaw plate body 2 can slide down under its own weight, avoiding the additional load caused by soil accumulation, and thus maintaining the stability of the bucket head closing speed.

[0044] Optionally, the cross-sectional shape of the reinforcing rib 7 can be an inverted V-shape or an arc shape, which makes the structure of the reinforcing rib 7 without a horizontal plane. The soil cannot obtain stable support on the reinforcing rib 7, ensuring that the soil can slide off immediately under its own weight, effectively preventing the soil from accumulating in the jaw plate body 2.

[0045] Furthermore, the reinforcing rib 7 can also be in the form of an arc shape, with the arc of the reinforcing rib 7 coaxially aligned with the rotation center of the jaw plate body 2, thereby enhancing the structural strength of the jaw plate body 2 in the rotational direction and preventing breakage of the jaw plate body 2. Further, multiple reinforcing ribs 7 can be provided, each with a common center, forming multiple concentric ring structures to further enhance the structural strength of the jaw plate body 2.

[0046] It is understood that when the reinforcing rib 7 is disposed on the outer panel 21, the reinforcing rib 7 can be disposed on the side of the outer panel 21 facing the inner panel 22, or on the side of the outer panel 21 away from the inner panel 22; similarly, when the reinforcing rib 7 is disposed on the inner panel 22, the reinforcing rib 7 can be disposed on the side of the inner panel 22 facing the outer panel 21, or on the side of the inner panel 22 away from the outer panel 21. In this embodiment, the reinforcing rib 7 is disposed on the side of the inner panel 22 and the outer panel 21 facing each other. That is, when the reinforcing rib 7 is disposed on the inner panel 22, it is located on the side of the inner panel 22 facing the outer panel 21; when the reinforcing rib 7 is disposed on the outer panel 21, it is located on the side of the outer panel 21 facing the inner panel 22.

[0047] Furthermore, the structures of the inner panel 22 and the outer panel 21 can be the same or different. Specifically, in order to ensure the gripping effect, the outer contour shapes of the inner panel 22 and the outer panel 21 are the same. The arrangement of the reinforcing ribs 7 on the inner panel 22 and the outer panel 21 can be the same or different. In this embodiment, the overall structure of the inner panel 22 and the outer panel 21 is the same, thereby reducing the processing cost and facilitating assembly.

[0048] In some embodiments, the jaw plate body 2 can also be thickened. The increase in thickness can be adaptively selected after mechanical analysis based on different application scenarios or different materials. The thickening setting can effectively distribute the maximum bending moment transmitted by the bucket teeth 1 at the moment the grab bucket closes, thereby significantly reducing the tensile stress on the outer surface of the jaw plate body 2 and improving the overall strength of the jaw plate body 2.

[0049] Furthermore, the reinforcing ribs 7 can also be concentrated at the leading edge of the jaw plate body 2, and / or the leading edge of the jaw plate body 2 can be locally thickened, thereby instantly spreading the huge bending moment transmitted from the root of the tooth 1 to the entire jaw plate body 2, avoiding the occurrence of weld tearing.

[0050] Furthermore, a weight-reducing groove 8 can be formed near the leading edge of the jaw plate body 2. The weight-reducing groove 8 reduces weight, ensuring the opening and closing speed of the jaw plate body 2 and guaranteeing operational efficiency. Optionally, the cross-sectional shape of the weight-reducing groove 8 can be rectangular, rhomboid, triangular, or circular, etc., and can be adaptively selected according to the shape of the area near the leading edge of the jaw plate body 2 where the weight-reducing groove 8 needs to be formed; of course, the number of weight-reducing grooves 8 can also be adjusted accordingly. In this embodiment, the cross-sectional shape of the weight-reducing groove 8 is triangular, and two are formed at intervals, thereby ensuring local structural strength while achieving weight reduction.

[0051] Reference Figure 4 In some embodiments, a scraper 3 is provided inside the hollow box. The scraper 3 includes two scraper blades 31 and an elastic connector 32. The two scraper blades 31 are respectively attached to the inner panel 22 and the outer panel 21 on opposite sides. One end of each scraper blade 31 is rotatably connected to the lower support beam 4, and the other end of each scraper blade 31 is connected by a connecting rod 33. The two ends of the elastic connector 32 are respectively connected to the lower support beam 4 and the connecting rod 33.

[0052] The scraper blade 31 forms a static support through the elastic connector 32. When the grab bucket grabs, the rotation of the jaw plate body 2 drives the scraping end of the scraper blade 31 to rotate away from the rock surface until the two jaw plate bodies 2 are closed, at which point the scraping end of the scraper blade 31 is at its farthest point from the rock surface. When the grab bucket opens, the rotation of the jaw plate body 2 and the elastic action of the elastic connector 32 drive the scraping end of the scraper blade 31 to rotate towards the rock surface, causing the scraper blade 31 to scrape off the soil adhering to the jaw plate body 2 along the inner wall of the jaw plate body 2 until the two jaw plate bodies 2 are open, at which point the scraping end of the scraper blade 31 is at its closest point to the rock surface. This ensures effective scraping and prevents soil accumulation inside the jaw plate body 2. Therefore, the bucket head can keep its inner cavity clean each time it is opened, thereby reducing the wear and corrosion of the bucket teeth 1 by soil and further extending the overall lifespan of the bucket head.

[0053] Among them, the elastic connector 32 can be made of materials such as helical spring, disc spring, leaf spring or elastic block. The elastic block can be made of materials such as polyurethane, nitrile rubber or hydrogenated nitrile rubber by casting, so that its overall structure is in the shape of a cuboid or cylinder, so as to adapt to the usage requirements of different application scenarios.

[0054] Both the jaw plate body 2 and the bucket teeth 1 are made of structural steel to ensure their overall structural strength and to ensure that the bucket teeth 1 and jaw plate body 2 are not prone to cracking under high impact loads, thereby ensuring the long-term effectiveness of the arc surface cutting structure.

[0055] The structural steel can be Q345A or Q355B, etc. In this embodiment, Q355B is used as the structural steel. Compared with Q345A, it has higher strength and better toughness, which can ensure that the bucket tooth 1 still maintains sufficient crack resistance and wear resistance under high impact and high wear conditions.

[0056] Reference Figures 1-8 This embodiment also provides a bucket assembly, which includes a lower support beam 4 and two bucket heads as described above. The two bucket heads are symmetrically arranged on both sides of the lower support beam 4 and rotatably mounted on the lower support beam 4, forming a double-jaw soil-grabbing structure that can open and close synchronously. The double-jaw structure allows the bucket teeth 1 to cut in opposite directions during the closing process, thus the rock strata are subjected to force on both sides simultaneously, which easily leads to tensile stress concentration and promotes rock mass collapse, thereby improving the crushing efficiency. At the same time, the symmetrical arrangement balances the forces on the lower support beam 4, reduces eccentric loading, and further ensures the reliability of the overall structure.

[0057] The jaw plate body 2 is rotatably connected to the lower support beam 4 via a rotating shaft 5, and a wear-resistant bushing 6 is fitted over the rotating shaft 5. This wear-resistant bushing 6 is installed in the shaft hole of the lower support beam 4 with a clearance fit. Therefore, during the frequent opening and closing of the bucket head, the sliding friction between the rotating shaft 5 and the shaft hole is converted into wear on the inner surface of the bushing, thus preventing wear on the lower support beam 4 and reducing maintenance costs. Furthermore, the bushing can be quickly replaced, thereby reducing the bucket's downtime and improving equipment utilization.

[0058] The wear-resistant bushing 6 can be made of materials such as high-manganese steel, high-chromium cast iron, or polyurethane. Furthermore, the wear-resistant bushing 6 can be a thickened version of a standard bushing, with the thickness adjustable based on factors such as the wear rate, design life, and maximum contact pressure of the bushing material.

[0059] Reference Figures 1-8 This embodiment also provides a grab bucket body, which includes an upper support beam and the aforementioned bucket assembly, with a lower support beam 4 connected to the upper support beam. The lower support beam 4 can be connected to the upper support beam via a chain or tie rod. The upper support beam can rise and fall with the lifting mechanism. Therefore, after the bucket assembly cuts into the rock strata, it can utilize the weight of the entire machine to provide continuous vertical pressure, thereby ensuring that the bucket teeth 1 always maintain high positive pressure and enhancing the crushing capability of the arc-shaped cutting structure.

[0060] The grab bucket provided in this embodiment can be a trenching grab bucket for seepage prevention walls, a double-rope or four-rope bulk cargo grab bucket, or a hydraulic double-jaw grab bucket, etc. In this embodiment, only the trenching grab bucket for seepage prevention walls is used as an example for description. Of course, the grab bucket also includes other components, which are the same as those in the prior art, so they will not be described in detail in this embodiment.

[0061] In some embodiments, the chain or tie rod used to connect the upper and lower support beams 4 can also be telescopic, thereby making the connection length between the upper and lower support beams 4 adjustable, allowing the grab bucket to adapt to rock strata of different thicknesses, and thus expanding the applicable range of working conditions for the grab bucket. Of course, the telescopic structure can be implemented using any structure in the prior art, and this embodiment will not elaborate on this.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0063] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A type of bucket tooth, characterized in that, The bucket head, applied to the grab bucket body, is rotatably configured and has an open state and a closed state during rotation; The outer contour of the bucket tooth (1) is a first arc surface (11). When the bucket head is open, the first included angle A between the tangent of the tip (12) of the bucket tooth (1) and the horizontal plane is an acute angle or a right angle.

2. The bucket teeth as described in claim 1, characterized in that, When the bucket head is in the open state, the circle formed by the tip (12) with the rotation center of the bucket head as the center is the trajectory circle (13). The trajectory circle (13) forms a second included angle B between the tangent at the tip (12) and the tangent at the tip (12), and the second included angle B is less than or equal to 15 degrees.

3. The bucket teeth as described in claim 1 or 2, characterized in that, The inner contour of the bucket tooth (1) is a second arc surface (14), and the concave direction of the second arc surface (14) is the same as the concave direction of the first arc surface (11), so that the bucket tooth (1) is crescent-shaped.

4. A bucket head, characterized in that, Includes the bucket teeth as described in any one of claims 1-3, and the jaw plate body (2), wherein the jaw plate body (2) is provided with a hollow box structure, and the jaw plate body (2) is rotatably disposed on the lower support beam (4) of the grab bucket body to realize the opening and closing action of the bucket head; the bucket teeth (1) are disposed on the front edge of the jaw plate body (2).

5. The bucket head as described in claim 4, characterized in that, The jaw plate body (2) includes an outer panel (21) and an inner panel (22) spaced apart. The outer panel (21) and the inner panel (22) are connected by an arc-shaped sealing plate (23) to form a hollow box structure. The hollow box is provided with at least one reinforcing rib (7), which is provided on the outer panel (21), and / or the reinforcing rib (7) is provided on the inner panel (22), and / or the reinforcing rib (7) is provided between the inner panel (22) and the outer panel (21).

6. The bucket head as described in claim 5, characterized in that, The reinforcing rib (7) is arc-shaped, and the arc of the reinforcing rib (7) is coaxially arranged with the rotation center of the jaw plate body (2).

7. The bucket head as described in claim 4, characterized in that, Both the jaw plate body (2) and the bucket teeth (1) are made of structural steel.

8. A bucket assembly, characterized in that, It includes a lower support beam (4) and two buckets as described in any one of claims 4-7. The two buckets are symmetrically arranged on both sides of the lower support beam (4) and rotatably arranged on the lower support beam (4) to form a double-jaw soil-grabbing structure that can be opened and closed synchronously.

9. The bucket assembly as described in claim 8, characterized in that, The jaw plate body (2) is rotatably connected to the lower bearing beam (4) via a rotating shaft (5), and the rotating shaft (5) is fitted with a wear-resistant bushing (6).

10. A grab bucket body, characterized in that, It includes an upper support beam and a bucket assembly as described in claim 8 or 9, wherein the lower support beam (4) is connected to the upper support beam.

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