Tooth structure of a hot mill plate for a density board
By adopting a gradient tooth profile design and a composite tooth tip structure on the grinding discs of the MDF hot mill, the problems of coarse material clogging and excessive grinding of fine materials have been solved, achieving gradient crushing and efficient and stable operation, and extending the life of the grinding discs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XINJIANG JIALIN WANJIA WOOD IND CO LTD
- Filing Date
- 2025-08-28
- Publication Date
- 2026-07-10
AI Technical Summary
The existing toothed structure of the grinding discs in the MDF hot grinding mill leads to coarse material clogging and excessive grinding of fine material, and also causes adhesion and entanglement problems, resulting in insufficient adaptability.
It adopts a gradient tooth profile design, combining high teeth with large pitch in the inlet area and low teeth with small pitch in the outlet area, and uses the thrust of the spiral teeth for graded crushing. The structural stability is enhanced by composite tooth tips and tooth root reinforcing ribs. At the same time, chip discharge grooves and flow guide grooves are set to improve material flow and heat dissipation efficiency, and damping rings and springs are used to reduce vibration loss.
It achieves gradient crushing of materials, improves grinding accuracy and stability, extends grinding disc life, avoids fiber adhesion and vibration loss, and ensures the efficient and stable operation of the hot mill.
Smart Images
Figure CN224478337U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of hot grinding mills, and in particular to a toothed structure of a grinding disc for a MDF hot grinding mill. Background Technology
[0002] The grinding discs of a thermal grinding mill are the core working components of the mill, undertaking the crucial functions of fiber separation and refinement. They are mostly made of high-strength alloy cast iron or wear-resistant steel, with specific tooth patterns (such as serrations, stripes, or spirals) distributed on the surface. The tooth design must match the characteristics of the raw materials and product requirements. During operation, a pair of grinding discs rotate relative to each other to form a grinding zone. Through the shearing, squeezing, and friction of the tooth surfaces, the plant raw materials softened by high temperature are decomposed into individual fibers. The precision, hardness, and gap control of the tooth shape directly affect the fiber length and uniformity, thus determining the quality of the subsequent products. The grinding discs must have wear resistance and impact resistance. They are the core components that ensure the efficient and stable operation of the thermal grinding mill. There are a total of 18 stationary grinding discs and 18 moving grinding discs arranged in a circle. This is one of them. Therefore, a tooth structure for a MDF thermal grinding mill grinding disc is required.
[0003] The tooth structure of the existing MDF hot grinding mill discs solves the problems of coarse material clogging and excessive grinding of fine material caused by the single tooth shape of traditional grinding discs. It achieves gradient crushing through gradual tooth shape and regional design, optimizes the output particle size, avoids adhesion and entanglement, and has greater adaptability.
[0004] To address the aforementioned issues, a search revealed a patent with publication number CN201386231Y that discloses a thermal grinding disc with optimized tooth structure. The patent describes a fan-shaped grinding disc divided into a grinding zone and a feeding zone from its outer edge to its inner edge. The grinding zone is further divided into a fine grinding zone and a coarse grinding zone. Different shaped grinding teeth are evenly arranged on the working surface of each zone, and transverse teeth are distributed in the tooth grooves between the teeth. By combining the mechanism of the grinding tooth geometry and arrangement when the grinding disc grinds fibers, the cross-sectional shape and arrangement angle of the teeth are rationally set to ensure the fiber separation quality and grinding efficiency of the grinding disc. The main feature of this disc is the grinding teeth in the grinding zone. The cross-sectional shape of the transverse teeth is an unequal-sided trapezoid, and the side inclination angle of the working teeth is greater than that of the non-working teeth. The inclination angle of the grinding teeth in the grinding zone is 8° to 24°, and the inclination angle of the grinding teeth in the feeding zone is 48° to 56°. The extension line of the grinding teeth in the feeding zone is tangent to the inner edge arc of the disc. Through the gradient tooth design and the thrust of the spiral teeth, the graded processing from coarse crushing to fine grinding is achieved, improving accuracy. In addition, composite tooth tips, tooth root reinforcing ribs and other structures are added to enhance shearing force and stability, extend service life, and have chip removal, flow guiding, heat dissipation design and shock absorption structure, which can prevent adhesion, promote flow, reduce loss, and comprehensively ensure efficient and stable operation, making it more applicable.
[0005] In light of this, in-depth research into the aforementioned issues led to the creation of this case. Utility Model Content
[0006] The purpose of this utility model is to provide a tooth structure for a grinding disc of a MDF hot mill, so as to solve the problem of the tooth structure of the existing MDF hot mill grinding disc mentioned in the background art. It solves the problems of coarse material clogging and excessive grinding of fine material caused by the single tooth shape of traditional grinding discs. Gradient crushing is achieved through gradual tooth shape and regional design, which optimizes the output particle size, avoids adhesion and entanglement, and has stronger adaptability.
[0007] To achieve the above objectives, this utility model provides the following technical solution: a toothed structure for a grinding disc of a MDF hot grinding mill, comprising a grinding disc, an inlet area and an outlet area on the outer side of the grinding disc, a cemented carbide plate mounted on the top of the grinding disc, a guide groove on the top of the grinding disc, a composite tooth tip mounted on the top surface of the grinding disc, a connecting groove extending through the top surface of the grinding disc, and a connecting rod disposed on the inner side of the connecting groove.
[0008] Preferably, a placement groove is formed through one side surface of the grinding disc, a helical tooth is installed inside the placement groove, and a chip removal groove is formed on one side surface of the inlet area.
[0009] Preferably, gradient teeth are installed on the inner sides of both the inlet and outlet areas.
[0010] Preferably, a composite tooth tip is mounted on the top of the grinding disc.
[0011] Preferably, the inlet area uses high teeth and large tooth pitch, while the outlet area uses low teeth and small tooth pitch.
[0012] Preferably, an upper fixing ring is provided above the grinding disc, and an upper fixing ring is fixedly connected to the inner surface of the upper fixing ring. A connecting piece is attached to one side surface of the upper fixing ring, and a first outer shell is installed on one side surface of the connecting piece. An installation groove is formed on the outer surface of the first outer shell, and a damping ring is attached to the inner surface of the installation groove. A second outer shell is sleeved on the outer surface of the damping ring. A spring is fixedly connected to the inner surface of the first outer shell, and a spring is fixedly connected to one end surface of the second outer shell.
[0013] Preferably, a lower fixing ring is fitted onto the outer surface of the connecting rod.
[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: The tooth structure of the grinding disc of the MDF hot mill allows material to enter from the inlet area. Relying on the high tooth and large tooth pitch design of the gradient teeth, and with the thrust of the spiral teeth, coarse crushing is completed. Then, it moves axially with the spiral teeth to the outlet area, where fine grinding is achieved through the low tooth and small tooth pitch structure of the gradient teeth. The graded treatment improves the grinding accuracy. The composite tooth tip undertakes the main shearing and grinding task, and the tooth root reinforcing rib enhances the structural stability and extends the service life of the grinding disc. The chip discharge groove on the tooth side discharges the chips in time, avoiding fiber adhesion that affects grinding. The tooth back guide groove accelerates the flow of slurry, and the hollow design improves heat dissipation efficiency, ensuring the continuous and stable operation of the grinding disc. In addition, the vibration generated by the grinding disc during operation is transmitted to the first outer shell through the upper fixing ring and connecting plate. The damping ring is frictionally damped in the second outer shell, and the spring further reduces vibration, reducing the wear and tear on the equipment. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall appearance and structure of the present utility model;
[0016] Figure 2 This is a schematic diagram of the export area structure of this utility model;
[0017] Figure 3 This is a top view of the grinding disc structure of this utility model;
[0018] Figure 4 This is a schematic diagram of the interlocking structure of the connecting rod and the upper fixing ring of this utility model;
[0019] Figure 5 This is a schematic diagram of the structure in which the spring and the second outer shell of this utility model cooperate with each other.
[0020] In the diagram: 1. Grinding disc; 2. Inlet area; 3. Outlet area; 4. Placement groove; 5. Chip removal groove; 6. Carbide; 7. Guide groove; 8. Helical tooth; 9. Gradient tooth; 10. Composite tooth tip; 11. Connecting groove; 12. Upper fixing ring; 13. Connecting piece; 14. First outer shell; 15. Mounting groove; 16. Damping ring; 17. Second outer shell; 18. Spring; 19. Connecting rod; 20. Lower fixing ring. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0022] Please see Figure 1-5This utility model provides a technical solution: a toothed structure for a grinding disc of a MDF hot grinding mill, including a grinding disc 1, an inlet area 2 and an outlet area 3 on the outer side of the grinding disc 1, a cemented carbide 6 installed on the top of the grinding disc 1, a guide groove 7 on the top of the grinding disc 1, a composite tooth tip 10 installed on the top surface of the grinding disc 1, a connecting groove 11 penetrating the top surface of the grinding disc 1, and a connecting rod 19 provided on the inner side of the connecting groove 11.
[0023] Furthermore, a placement groove 4 is provided through one side surface of the grinding disc 1, and a spiral tooth 8 is installed inside the placement groove 4. A chip removal groove 5 is provided on one side surface of the inlet area 2. The chip removal groove 5 improves the chip removal effect.
[0024] Furthermore, gradient teeth 9 are installed on the inner sides of both the entrance area 2 and the exit area 3, which improves the performance.
[0025] Furthermore, a composite tooth tip 10 is installed on top of the grinding disc 1, which improves the grinding effect.
[0026] Furthermore, the inlet area 2 uses high teeth and large tooth pitch, while the outlet area 3 uses low teeth and small tooth pitch. By using high teeth and large tooth pitch in the inlet area 2, the performance is better.
[0027] Furthermore, an upper fixing ring 12 is provided above the grinding disc 1. The inner surface of the upper fixing ring 12 is fixedly connected to the upper fixing ring 12. A connecting piece 13 is attached to one side surface of the upper fixing ring 12. A first outer shell 14 is installed on one side surface of the connecting piece 13. An installation groove 15 is opened on the outer surface of the first outer shell 14. A damping ring 16 is attached to the inner surface of the installation groove 15. A second outer shell 17 is sleeved on the outer surface of the damping ring 16. A spring 18 is fixedly connected to the inner surface of the first outer shell 14. A spring 18 is fixedly connected to one end surface of the second outer shell 17. The spring 18 improves the shock absorption effect.
[0028] Furthermore, a lower fixing ring 20 is fitted onto the outer surface of the connecting rod 19, which improves the installation effect.
[0029] Working principle: First, the material enters from the inlet area 2 of the grinding disc 1. Because the inlet area adopts the high tooth + large pitch design of the gradient tooth 9, combined with the spiral thrust of the spiral tooth 8, the material is first coarsely crushed. Then, the material moves axially with the spiral tooth 8 and gradually enters the outlet area 3. Here, the low tooth and small pitch structure of the gradient tooth 9 is used to achieve fine grinding. During the process, the composite tooth tip 10 undertakes the main shearing and grinding, the tooth root reinforcing rib enhances the structural stability, and the chip discharge groove 5 on the tooth side discharges the chips in time to avoid fiber adhesion. The guide groove 7 on the tooth back accelerates the flow of slurry and improves heat dissipation efficiency with the hollow design. The vibration generated when the grinding disc 1 is working will be connected to the upper connecting plate 13 through the upper fixed ring 12 to squeeze the first outer shell 14. Then, the first outer shell 14 drives the damping ring 16 to perform friction damping in the second outer shell 17 to achieve the effect of shock absorption and buffering. At the same time, it squeezes the spring 18 for further shock absorption and protection.
[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A toothed structure for a grinding disc of a MDF hot grinding mill, comprising a grinding disc (1), characterized in that: An inlet area (2) is provided on the outer side of the grinding disc (1), an outlet area (3) is provided on the outer side of the grinding disc (1), a cemented carbide (6) is installed on the top of the grinding disc (1), a guide groove (7) is provided on the top of the grinding disc (1), a composite tooth tip (10) is installed on the upper surface of the grinding disc (1), a connecting groove (11) is provided through the upper surface of the grinding disc (1), and a connecting rod (19) is provided on the inner side of the connecting groove (11).
2. The toothed structure of a MDF hot grinding mill grinding disc according to claim 1, characterized in that: A placement groove (4) is provided through one side surface of the grinding disc (1), and a spiral tooth (8) is installed on the inner side of the placement groove (4). A chip removal groove (5) is provided on one side surface of the inlet area (2).
3. The toothed structure of a MDF hot grinding mill grinding disc according to claim 1, characterized in that: Gradient teeth (9) are installed on the inner sides of both the inlet area (2) and the outlet area (3).
4. The toothed structure of a MDF hot grinding mill grinding disc according to claim 1, characterized in that: A composite tooth tip (10) is mounted on the top of the grinding disc (1).
5. The toothed structure of a MDF hot grinding mill grinding disc according to claim 1, characterized in that: The inlet area (2) uses high teeth and large tooth pitch, while the outlet area (3) uses low teeth and small tooth pitch.
6. The toothed structure of a MDF hot grinding mill grinding disc according to claim 1, characterized in that: An upper fixing ring (12) is provided above the grinding disc (1). The inner surface of the upper fixing ring (12) is fixedly connected to the upper fixing ring (12). A connecting piece (13) is attached to one side surface of the upper fixing ring (12). A first outer shell (14) is installed on one side surface of the connecting piece (13). An installation groove (15) is opened on the outer surface of the first outer shell (14). A damping ring (16) is attached to the inner surface of the installation groove (15). A second outer shell (17) is sleeved on the outer surface of the damping ring (16). A spring (18) is fixedly connected to the inner surface of the first outer shell (14). A spring (18) is fixedly connected to one end surface of the second outer shell (17).
7. The toothed structure of a MDF hot grinding mill grinding disc according to claim 1, characterized in that: The outer surface of the connecting rod (19) is fitted with a lower fixing ring (20).