Brazeless ring layer assembled wear-resistant tooth

Abstract

The utility model belongs to the pick technology field for mining and tunnel construction, especially relates to a brazing -free ring layer assembly wear -resisting pick. The ring layer assembly wear -resisting pick includes tooth handle, alloy tooth head and ring layer wear -resisting cover, the tooth handle is divided into tooth handle head, tooth handle middle part and tooth handle tail portion connected in proper order, tooth handle head, tooth handle middle part and tooth handle tail portion diameter increase gradually, tooth handle head is connected with alloy tooth head threadedly, and tooth handle middle part is connected with ring layer wear -resisting cover threadedly, the outer circular surface of ring layer wear -resisting cover is embedded with a plurality of hard alloy bean and hard alloy block. The problem of pick wear, tooth head drop and short service life is solved.

Description

Technical Field

[0001] This utility model belongs to the field of cutting teeth technology for mining and tunnel construction, and specifically relates to a wear-resistant cutting tooth with ring-layer assembly without brazing. Background Technology

[0002] Cutting teeth are key wear-resistant components of equipment such as coal mining machine drums and tunneling machine blast heads. They are responsible for breaking rocks and cutting coal, and their performance directly affects the mining capacity, operational stability, and construction costs of mining machinery. The front end of the cutting tooth usually adopts a cemented carbide head with a conical structure, which cuts coal seams or rock strata through impact rotation, and withstands strong periodic impact loads in the process.

[0003] As a consumable component, the alloy tip of a cutting tooth gradually wears down from its sharp point to a blunt shape under the intense friction of coal and rock. With increasing friction and extended service life, the alloy tip continues to wear until it fails. Currently, the wear cycle of cutting teeth is mainly constrained by the following factors: harsh operating environment, substandard material properties, alloy tip detachment or breakage, and improper heat treatment processes. Among these, harsh working conditions during engineering mining are difficult to avoid, and the worse the working conditions, the more severe the alloy tip detachment tends to be.

[0004] To address the issue of tooth tip detachment, existing technologies generally employ brazing to connect the alloy tip and the tooth body, primarily including three processes: vacuum brazing, high-frequency induction welding, and flame / gas heating welding. While vacuum brazing offers advantages such as high weld strength and good weld quality, it suffers from problems like expensive equipment, high energy consumption, and low efficiency. High-frequency induction welding and flame / gas heating welding, while offering fast heating speeds and relatively low costs, require highly skilled operators, their weld quality is greatly affected by human factors, and they are prone to oxidation and decarburization, leading to a decrease in weld strength. More importantly, all of these brazing processes rely on brazing filler metal as an intermediate connecting layer. Under long-term high-intensity, high-frequency impact loads, the brazed interface easily becomes a fatigue weak point, resulting in tooth tip detachment. Especially in extreme conditions such as deep well mining and hard rock tunneling, the failure rate of brazed cutting teeth remains high, making it difficult to fundamentally meet the requirements for high reliability and long service life. Utility Model Content

[0005] The purpose of this invention is to provide a brazing-free ring-layer assembled wear-resistant cutting tooth, which solves the problems of severe cutting tooth wear, tooth tip loss and short service life.

[0006] This utility model is achieved through the following technical solution: This utility model discloses a brazing-free annular layer assembly wear-resistant cutting tooth, including a tooth shank, an alloy tooth head, and an annular layer wear-resistant sleeve. The tooth shank is divided into a tooth shank head, a tooth shank middle section, and a tooth shank tail section connected in sequence. The diameters of the tooth shank head, tooth shank middle section, and tooth shank tail section increase in sequence. The tooth shank head is threadedly connected to the alloy tooth head, and the tooth shank middle section is threadedly connected to the annular layer wear-resistant sleeve. The outer circular surface of the annular wear-resistant sleeve is embedded with multiple cemented carbide beads and cemented carbide blocks.

[0007] Furthermore, the tail of the toothed shank is designed with a retaining spring groove.

[0008] Furthermore, the alloy tooth tip is conical, mushroom-shaped, or cap-shaped.

[0009] Furthermore, the annular wear-resistant sleeve is provided in multiple layers, and the transition between the multiple annular wear-resistant sleeves is smooth.

[0010] Furthermore, the transition between the annular wear-resistant sleeve and the alloy tooth head is smooth.

[0011] Furthermore, the toothed shank head and the middle of the toothed shank have external threads.

[0012] Furthermore, the cemented carbide beads and cemented carbide blocks are arranged alternately.

[0013] Furthermore, the retaining ring groove is an annular groove for installing the retaining ring, thereby achieving axial fixation of the connecting components.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: This utility model discloses a brazing-free, ring-layer assembled wear-resistant cutting tooth, assembled from a tooth shank, an alloy tooth head, and multiple ring-layer wear-resistant sleeves. The tooth shank features a three-stage stepped structure with progressively increasing diameters at the head, middle, and tail. The head and middle sections have external threads, which respectively match the internal threads of the alloy tooth head and the ring-layer wear-resistant sleeves. This anti-detachment design provides greater stability and prevents detachment due to impact and vibration during operation. Simultaneously, the individual production of each component reduces manufacturing complexity and helps improve cutting tooth production efficiency. The ring-layer wear-resistant sleeves incorporate varying numbers of cemented carbide blocks and cemented carbide beads to form a composite structure, giving it higher strength and wear resistance. Operating in high-friction and impact environments, it can withstand enormous loads without easily breaking, extending the cutting tooth's service life. The ring-layer assembled wear-resistant cutting tooth offers greater flexibility; components can be modified as needed during design and production without redesigning the cutting tooth structure. Independent quality inspection of each assembly component ensures that each part meets standards, thereby improving the overall product quality. Meanwhile, each assembly component can be replaced or repaired individually, making maintenance and repair easy, reducing downtime and maintenance costs, and making it suitable for widespread use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a brazing-free ring-layer assembled wear-resistant cutting tooth according to this utility model; Figure 2 This is a schematic diagram of the toothed shank.

[0016] Among them, 1. tooth shank; 2. alloy tooth head; 3. annular wear-resistant sleeve; 4. carbide bead; 5. carbide block; 6. snap ring groove; 11. Head of the toothed shank; 12. Middle part of the toothed shank; 13. Tail of the toothed shank. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it; that is, the described embodiments are only a part of, and not all, of the embodiments of this utility model.

[0018] The detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely to illustrate one selected embodiment of the invention. All other embodiments obtained by those skilled in the art based on the drawings and embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] Traditionally, existing cutting tools in coal mining or tunneling operations typically use brazing to connect the alloy head to the tool body. However, brazing technology suffers from problems such as insufficient weld strength, susceptibility to oxidation and decarburization, limited production efficiency, and high costs. Under harsh working conditions, these defects cause the alloy head to easily detach or break, severely affecting the service life of the cutting tool and the operational stability of the mining equipment, increasing maintenance costs and downtime.

[0020] In this regard, such as Figure 1 and Figure 2 As shown, this utility model discloses a brazing-free annular layer assembly wear-resistant cutting tooth, which effectively solves the problem of alloy head detachment by using a threaded connection instead of the traditional brazing process. The cutting tooth includes a shank 1, an alloy tooth head 2, and an annular layer wear-resistant sleeve 3. The shank 1 is designed with a shank head 11, a shank middle section 12, and a shank tail section 13 connected in sequence with increasing diameters. The alloy tooth head 2 is threadedly connected to the shank head 11, and the annular layer wear-resistant sleeve 3 is also threadedly connected to the shank middle section 12. Furthermore, the outer circumference of the annular layer wear-resistant sleeve 3 is embedded with staggered cemented carbide beads 4 and cemented carbide blocks 5, further improving the wear resistance of the cutting tooth.

[0021] For ease of understanding, the following explains some key terms in this embodiment: The tooth shank 1, as the main structure of the cutting tooth, has the main function of providing a foundation for installation and connection, and bearing the impact force from the alloy tooth head 2, transmitting the force to the mining equipment.

[0022] Alloy tooth 2 is the part at the front end of the cutting tooth used to directly contact the coal seam or rock strata for cutting and crushing. It is usually made of high-hardness alloy material to resist wear and impact.

[0023] The annular wear-resistant sleeve 3 is a protective component fitted over the outside of the tooth shank 1. Its function is to enhance the wear resistance of the cutting tooth in the working area and extend the service life of the cutting tooth.

[0024] The cemented carbide bead 4 and the cemented carbide block 5 are high-hardness wear-resistant materials embedded in the outer circular surface of the annular wear-resistant sleeve 3. Through their high hardness characteristics, they further enhance the wear resistance of the annular wear-resistant sleeve 3.

[0025] This embodiment provides a ring-layered wear-resistant cutting tooth, the structural design of which aims to improve the durability and reliability of the cutting tooth. The cutting tooth mainly consists of a shank 1, an alloy tooth head 2, and a ring-layered wear-resistant sleeve 3. The shank 1 serves as the load-bearing body of the cutting tooth, the alloy tooth head 2 is responsible for rock breaking and coal cutting, and the ring-layered wear-resistant sleeve 3 provides additional wear-resistant protection. These components, through specific connection methods and material combinations, jointly achieve the function of the cutting tooth.

[0026] Specifically, the toothed shank 1 is divided into three sequentially connected parts: the toothed shank head 11, the toothed shank middle section 12, and the toothed shank tail section 13. This segmented design allows the toothed shank 1 to adapt to the connection requirements of different components and optimizes the overall mechanical performance. For example, the toothed shank head 11 can be used to connect the alloy toothed head 2, the toothed shank middle section 12 can be used to connect the annular wear-resistant sleeve 3, and the toothed shank tail section 13 can be used to connect with mining equipment.

[0027] In terms of structural dimensions, the diameters of the tooth shank head 11, the middle section 12, and the tail section 13 are designed to increase sequentially. This gradually increasing diameter structure helps to distribute stress from the smaller head region to the larger tail region when the cutting tooth is subjected to impact loads, thereby enhancing the overall strength and fracture resistance of the tooth shank 1. For example, stress concentration can be alleviated under impact, avoiding local overload.

[0028] The alloy tooth 2 and the tooth shank head 11 are connected by a threaded connection. By machining matching threads on the outer surface of the tooth shank head 11 and the inner surface of the alloy tooth 2, the alloy tooth 2 is screwed and fixed onto the tooth shank head 11. This connection method avoids welding defects that may exist in traditional brazing processes, such as uneven weld strength and oxidation decarburization, thereby improving the reliability of the alloy tooth 2 connection.

[0029] The annular wear-resistant sleeve 3 and the middle part 12 of the gear shank are also connected by threads. The inner surface of the annular wear-resistant sleeve 3 and the outer surface of the middle part 12 of the gear shank are machined into a mating thread structure, so that the annular wear-resistant sleeve 3 can be screwed and fixed on the middle part 12 of the gear shank. This connection method makes it easy to install and replace the annular wear-resistant sleeve 3, while ensuring that it is not easy to loosen or fall off during operation.

[0030] The outer circumferential surface of the annular wear-resistant sleeve 3 is embedded with cemented carbide beads 4 and cemented carbide blocks 5, which are arranged in a staggered manner. The cemented carbide beads 4 and cemented carbide blocks 5 are fixed to the surface of the annular wear-resistant sleeve 3 by pre-machined grooves or pressing. This staggered arrangement ensures that the annular wear-resistant sleeve 3 has uniform wear resistance in all directions, avoiding excessively rapid local wear and thus extending the overall service life of the annular wear-resistant sleeve 3.

[0031] The annular layered wear-resistant cutting tooth of this embodiment effectively avoids welding defects and alloy head detachment problems caused by traditional brazing processes by using threaded connections between the alloy tooth head 2 and the tooth shank head 11, and between the annular layered wear-resistant sleeve 3 and the tooth shank middle part 12. This significantly improves the connection reliability and operational stability of the cutting tooth in coal and rock mining. At the same time, the gradually increasing diameter design of the tooth shank 1 enhances the structural strength, while the staggered arrangement of cemented carbide beads 4 and cemented carbide blocks 5 on the annular layered wear-resistant sleeve 3 greatly improves the overall wear resistance of the cutting tooth, thereby extending its service life and reducing the maintenance frequency and operating costs of mining equipment.

[0032] In some of the above-mentioned solutions of this utility model, a toothed tail 13 is proposed to connect the cutting tooth component. However, in this process, the toothed tail 13 lacks an effective fixing mechanism, which can easily cause the component to loosen or fall off under impact load.

[0033] In this regard, the present invention further proposes that the tail of the toothed shank 13 is designed with a retaining spring groove 6.

[0034] Specifically, the snap ring groove 6 is an annular groove for mounting a snap ring. Its main function is to provide a physical limiting point for axial fixation of the connected components. The cross-sectional shape of the snap ring groove 6 can be designed according to the selected snap ring type and assembly requirements; for example, it can be a rectangular cross-section or a cross-section with chamfers or rounded corners. In actual manufacturing, the snap ring groove 6 can be formed on the outer cylindrical surface of the tooth shank tail 13 through various machining methods. For example, it can be formed by turning, using a special tool on a lathe to precisely machine the tooth shank tail 13 to ensure the dimensional accuracy and positional accuracy of the snap ring groove 6. Alternatively, it can be formed by milling or grinding. The snap ring groove 6 is usually located near the end of the tooth shank tail 13 to facilitate snap ring installation and effectively fix the cutting tooth holder or other components connected to the tooth shank tail 13.

[0035] Through the above technical solution, a retaining ring groove 6 is provided on the tail 13 of the tooth shank, enabling the installation of a retaining ring and thus providing an additional, independent mechanical locking point for the overall structure of the cutting tooth. Given that the cutting tooth of this invention adopts a brazing-free assembly method, for example, the tooth shank head 11 and the alloy tooth head 2, as well as the tooth shank middle 12 and the annular wear-resistant sleeve 3, are all connected by threads. Although the threaded connection provides good radial and partial axial fixation, there is still a risk of loosening or detachment of the connecting parts under the strong impact and vibration loads encountered in mining operations. The introduction of the retaining ring groove 6 allows the retaining ring to form a reliable mechanical engagement with the cutting tooth seat or other connecting parts, effectively preventing accidental axial disengagement or loosening of the tooth shank 1. This significantly enhances the axial fixation capability and overall stability of the cutting tooth under harsh working conditions, avoiding equipment downtime and production interruptions caused by loosening or detachment of parts, thereby improving the service reliability and service life of the cutting tooth.

[0036] In some of the above-mentioned solutions of this utility model, the alloy tooth 2 and the tooth shank 1 are threaded together to avoid brazing problems. However, in the process of implementation, the shape of the alloy tooth 2 may affect its wear resistance and service life. Under harsh working conditions, it is easy to wear into a rounded shape, which leads to increased friction and the risk of falling off.

[0037] In this regard, the present invention further proposes that the alloy tooth 2 be conical, mushroom-shaped, or cap-shaped.

[0038] Specifically, the conical shape refers to the cone-shaped geometry of the alloy tooth 2, which gradually tapers from the base to the tip. This shape of the alloy tooth 2 provides a concentrated cutting point, achieving efficient initial penetration when breaking rock and cutting coal. This can be achieved by designs with different cone angles; for example, a smaller cone angle can be used for hard rock to enhance penetration, while a larger cone angle can be used for softer coal seams to improve resistance to fracturing.

[0039] Mushroom-shaped refers to the geometry of the alloy tooth 2 resembling a mushroom, typically featuring a wide top and a relatively narrow neck. This shape of the alloy tooth 2 can distribute impact loads over a larger surface area, thus effectively resisting impact and chipping. This can be achieved through designs with a hemispherical or flat dome-shaped top, or designs with a smooth transition between the neck and top, or with a prominent shoulder.

[0040] The "hat shape" refers to the geometric shape of the alloy tooth 2 resembling a hat, typically featuring a wide and relatively flat or slightly curved top. This shape of the alloy tooth 2 exhibits excellent stability under vertical impact and effectively disperses wear, extending its service life. This can be achieved through designs with a flat top and rounded corners, or a slightly convex curved top, to adapt to different wear conditions.

[0041] Through the above technical solution, this utility model optimizes the geometry of the alloy tooth 2, enabling it to better resist wear and impact during rock breaking and coal cutting. The conical alloy tooth 2 provides a sharp cutting point, which helps reduce the initial wear rate and maintains efficient cutting capability. The mushroom-shaped or cap-shaped alloy tooth 2 significantly enhances the overall impact resistance by increasing the contact area and optimizing stress distribution, effectively delaying the process of the alloy tooth 2 wearing into a blunt shape. This optimization of geometry, combined with the threaded connection between the alloy tooth 2 and the tooth shank 1, not only reduces the risk of detachment due to increased friction, but also significantly improves the wear resistance and service life of the cutting tooth, thus maintaining good operational stability under harsh working conditions.

[0042] In some of the above-mentioned solutions of this utility model, annular wear-resistant sleeves 3 are proposed to enhance the wear resistance and structural stability of the cutting teeth through threaded connection. However, in the setting of multiple annular wear-resistant sleeves 3, if the transition between the sleeves is not smooth, it may lead to stress concentration at the connection, uneven wear and increased risk of falling off, thereby affecting the overall service life and operational reliability of the cutting teeth.

[0043] In this regard, the present invention further proposes that multiple annular wear-resistant sleeves 3 are provided, and the transition between multiple annular wear-resistant sleeves 3 is smooth.

[0044] Specifically, multiple annular wear-resistant sleeves 3 are provided, meaning that instead of a single integral annular wear-resistant sleeve 3, two or more independent annular wear-resistant sleeves 3 are used on the middle part 12 of the tooth shank. This design can distribute the wear load borne by the cutting tooth during operation to multiple annular wear-resistant sleeves 3, thereby avoiding excessive wear in a single area and extending the effective service life of a single annular wear-resistant sleeve 3. For example, multiple annular wear-resistant sleeves 3 can be designed as a modular structure with the same or similar dimensions, and installed sequentially on the middle part 12 of the tooth shank by threads or other mechanical connections; or, multiple annular wear-resistant sleeves 3 can be designed as a structure with gradually changing dimensions or complementary shapes to adapt to the taper or specific wear areas of the middle part 12 of the tooth shank.

[0045] Meanwhile, the smooth transition between multiple annular wear-resistant sleeves 3 means that there are no obvious steps, sharp edges, or discontinuities at the joints of adjacent annular wear-resistant sleeves 3. This smooth transition design aims to eliminate stress concentration points at the joints and reduce localized high-stress areas that may be generated under impact and friction. For example, a smooth transition can be achieved by providing chamfers, rounded transition surfaces, or tapered mating surfaces at the joint ends of adjacent annular wear-resistant sleeves 3; alternatively, a smooth transition can also be achieved by precisely machining the mating surfaces of the annular wear-resistant sleeves 3 to ensure a tight fit without obvious gaps or steps.

[0046] Through the above technical solution, during the operation of the cutting tooth, multiple annular wear-resistant sleeves 3 can effectively distribute the wear load, avoiding excessive local wear of a single annular wear-resistant sleeve 3, thereby extending the overall service life of the cutting tooth. Furthermore, the smooth transition design between the multiple annular wear-resistant sleeves 3 eliminates sharp edges or discontinuities at the joints, significantly reducing stress concentration and effectively preventing the risk of loosening or detachment of the annular wear-resistant sleeves 3 due to uneven wear. This allows the cutting tooth to maintain more stable structural integrity and operational reliability under harsh working conditions, further improving its wear resistance and service life.

[0047] In some embodiments of this invention described above, a connection is proposed between the annular wear-resistant sleeve 3 and the alloy tooth 2. However, during implementation, an uneven transition at the connection point may lead to stress concentration and increased wear, thereby affecting the durability and reliability of the cutting tooth. Therefore, this invention further proposes a smooth transition between the annular wear-resistant sleeve 3 and the alloy tooth 2.

[0048] "Smooth transition" refers to the continuous, gradual, and abrupt characteristic of the surface geometry or contour line at the connection area between the annular wear-resistant sleeve 3 and the alloy tooth 2. This design aims to eliminate sharp edges, grooves, or sudden changes in cross-section, thereby ensuring uniform stress distribution. One implementation method is to provide rounded corners or chamfers at the connection between the annular wear-resistant sleeve 3 and the alloy tooth 2. For example, this can be achieved by machining the connection edge to form an arc transition surface with a specific radius, or a bevel transition at a certain angle. Another implementation method is to optimize the overall contour design of the annular wear-resistant sleeve 3 and the alloy tooth 2, so that they naturally form a smooth curve or tapered transition in the connection area. For example, the root of the alloy tooth 2 can be designed as a gradually expanding cone or arc, while the end of the annular wear-resistant sleeve 3 can be designed as a matching inner cone or inner arc, so that the two form a continuous and stepless surface after assembly.

[0049] Through the above technical solution, this utility model effectively solves the problem of stress concentration and accelerated wear caused by the uneven connection between the annular wear-resistant sleeve 3 and the alloy tooth 2. During mining operations, the alloy tooth 2 and the annular wear-resistant sleeve 3 are subjected to cyclic impact loads and friction. If there are sharp edges or sudden geometric changes at the connection, these areas will become stress concentration points, leading to accelerated material fatigue, increased susceptibility to cracking, and accelerated localized wear. Through a smooth transition design, impact loads and friction can be more evenly distributed in the connection area, avoiding localized stress peaks and significantly reducing the risk of material failure. Combined with the overall structure of the annular assembly wear-resistant cutting tooth, especially the threaded connection between the alloy tooth 2 and the tooth shank head 11, and the threaded connection between the annular wear-resistant sleeve 3 and the tooth shank middle 12, the smooth transition design further enhances the integrity and stability of the entire cutting tooth structure. It not only protects the durability of the alloy tooth 2 and the annular wear-resistant sleeve 3 themselves, but also indirectly reduces the stress burden on the threaded connection, extends the overall service life of the cutting tooth, and improves its reliability under harsh working conditions.

[0050] Specifically, the diameter of the internal threaded hole of the alloy tooth 2 is 5-312mm, and the height is 12-110mm.

[0051] The outer diameter of the annular wear-resistant sleeve 3 is 20-60mm, and the thickness is 12-120mm.

[0052] The diameter of the internal threaded hole of the annular wear-resistant sleeve 3 is 10-35mm.

[0053] The number of layers in the annular wear-resistant sleeve 3 assembly is 2-12.

[0054] The cemented carbide bead 4 has a diameter of 13-10 mm and a height of 11-211 mm.

[0055] The number of cemented carbide beads 4 embedded in a single annular wear-resistant sleeve is 11-113.

[0056] The side length of the cemented carbide block 5 is 2-20mm.

[0057] The number of cemented carbide blocks 5 embedded in a single annular wear-resistant sleeve 3 is 11-32.

[0058] The following example will provide a more detailed explanation of the above technical solution: At a mining site, a user uses a coal cutting machine to cut coal seams. During operation, traditional cutting teeth often suffer from alloy tooth tips that detach or break due to severe impact and friction, while the tooth body is also prone to severe wear, leading to premature failure. Current brazing techniques between the alloy tooth tip and the tooth body suffer from inconsistent weld strength, susceptibility to oxidation and decarburization, and high production costs, all of which affect the overall performance and service life of the cutting teeth.

[0059] To address the aforementioned issues, the user adopted a ring-layered wear-resistant cutting tooth assembly. This cutting tooth comprises a shank 1, an alloy tooth head 2, and a ring-layered wear-resistant sleeve 3. The shank 1 is designed with a sequentially connected shank head 11, shank middle section 12, and shank tail section 13, with the diameters of these three sections increasing sequentially, providing a base structure with good load-bearing capacity.

[0060] During assembly, the alloy tooth 2, such as a conical alloy tooth, is first securely mounted on the tooth shank head 11 via a threaded connection. This mechanical threaded connection avoids the defects of traditional brazing processes, such as oxidation, decarburization, or inconsistent weld strength, ensuring the reliability of the connection between the alloy tooth 2 and the tooth shank 1. Compared to brazing processes, which require highly skilled operators and complex equipment, the threaded connection assembly process is simpler and more efficient.

[0061] Subsequently, one or more annular wear-resistant sleeves 3 are threaded onto the center 12 of the tooth shank. If multiple annular wear-resistant sleeves 3 are used, the transition between these sleeves is designed to reduce stress concentration and ensure the overall smoothness of the cutting tooth. The outer circumference of the annular wear-resistant sleeve 3 is inlaid with staggered carbide beads 4 and carbide blocks 5. These carbide elements enhance the wear resistance of the annular wear-resistant sleeve 3, protecting the center 12 of the tooth shank from severe wear by coal and rock during mining operations, thereby extending the overall service life of the cutting tooth. The transition between the annular wear-resistant sleeve 3 and the alloy tooth head 2 is also designed to be smooth, improving the stress distribution and impact resistance of the cutting tooth.

[0062] To further enhance the stability of the cutting tooth, a retaining spring groove 6 is designed at the tail of the tooth shank 13. When the cutting tooth is installed on the mining equipment, the retaining spring groove 6 can cooperate with the corresponding fixing mechanism to help ensure that the cutting tooth remains stable under high-speed rotation and strong impact, and to prevent loosening or falling off.

[0063] By assembling wear-resistant cutting teeth in this ring-layer configuration, a reliable brazing-free mechanical connection is achieved between the alloy tooth tip 2 and the tooth shank 1, solving the problem of alloy tooth tip detachment. Simultaneously, the ring-layer wear-resistant sleeve 3 protects the middle part 12 of the tooth shank, improving the wear resistance of the cutting tooth and solving the problem of excessive tooth wear. The entire assembly scheme, through the tight cooperation of its components, forms a cutting tooth with high structural strength, good wear resistance, and ease of manufacturing and maintenance. Its performance is superior to traditional brazed cutting teeth, especially exhibiting higher reliability under harsh working conditions.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of this utility model.

Claims

1. A brazing-free ring-layer assembled wear-resistant cutting tooth, characterized in that, It includes a toothed shank (1), an alloy toothed head (2), and an annular wear-resistant sleeve (3). The toothed shank (1) is divided into a toothed shank head (11), a toothed shank middle section (12), and a toothed shank tail section (13) connected in sequence. The diameters of the toothed shank head (11), the toothed shank middle section (12), and the toothed shank tail section (13) increase in sequence. The toothed shank head (11) is threadedly connected to the alloy toothed head (2), and the toothed shank middle section (12) is threadedly connected to the annular wear-resistant sleeve (3). The outer circular surface of the annular wear-resistant sleeve (3) is inlaid with multiple cemented carbide beads (4) and cemented carbide blocks (5).

2. The wear-resistant cutting tooth of the ring-layer assembly without brazing according to claim 1, characterized in that, The tail of the toothed shank (13) is designed with a retaining ring groove (6).

3. The wear-resistant cutting tooth of the ring-layer assembly without brazing according to claim 1, characterized in that, The alloy tooth (2) is conical, mushroom-shaped or cap-shaped.

4. The brazing-free ring-layer assembled wear-resistant cutting tooth according to claim 1, characterized in that, The annular wear-resistant sleeve (3) is provided in multiple layers, and the transition between the multiple annular wear-resistant sleeves (3) is smooth.

5. The wear-resistant cutting tooth of the ring-layer assembly without brazing according to claim 1, characterized in that, The transition between the annular wear-resistant sleeve (3) and the alloy tooth (2) is smooth.

6. The brazing-free ring-layer assembled wear-resistant cutting tooth according to claim 1, characterized in that, The toothed head (11) and the middle part (12) of the toothed shank have external threads.

7. The brazing-free ring-layer assembled wear-resistant cutting tooth according to claim 1, characterized in that, The cemented carbide beans (4) and cemented carbide blocks (5) are arranged alternately.

8. The brazing-free ring-layer assembled wear-resistant cutting tooth according to claim 2, characterized in that, The snap ring groove (6) is an annular groove for installing snap rings, thereby achieving axial fixation of the connecting parts.

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