Energy-efficient refiner plate

Abstract

This utility model discloses a high-efficiency and energy-saving grinding disc for a pulping machine, comprising a grinding disc body, several grinding disc bodies spliced ​​together to form an annular grinding area. The grinding disc body has an inner arc edge and an outer arc edge, and its upper surface is a grinding end face with grinding grooves formed thereon. The grinding grooves extend along the direction from the inner arc edge to the outer arc edge, and grinding ridges are formed between adjacent grinding grooves. Grinding dams are provided in the grinding grooves. The grinding end face is divided into an inner grinding area, a transition area, and an outer grinding area from the inner arc edge to the outer arc edge. At least in the outer grinding area, the grinding dams of the adjacent grinding grooves are arranged along a first linear direction, which is a straight direction and forms an acute angle with the radial direction. The grinding dams of every two or more adjacent grinding grooves are arranged along a second linear direction, which is arc-shaped and the center of the arc is offset from the center of the grinding area, or the second linear direction is spiral-shaped. This structure improves grinding quality and production efficiency.

Description

Technical Field

[0001] This utility model specifically relates to a high-efficiency and energy-saving grinding disc for a pulping machine. Background Technology

[0002] The production and processing of paper pulping, fiberboard, and plant feed all rely on the grinding discs or milling plates of refiners. In these processes, one or more sets of relatively moving grinding discs or milling plates constitute the refining working area. The raised ridges on the grinding disc or milling plate substrate are called grinding teeth, and the gaps formed between the grinding teeth are called grinding grooves, serving as channels for pulp flow and grinding. The entire refining working area is composed of a large number of grinding teeth and grinding grooves arranged in an orderly manner. Their structural parameters, such as width, height, angle, number, and distribution, directly affect the fiber disintegration, cutting, crushing, and fibrillation effects, thus determining the pulp quality. In practical applications, the pulp needs to flow from the inlet end to the outlet end of the grinding disc, repeatedly leaping to the grinding tooth surface in the tiny gaps between the moving and stationary grinding discs, undergoing shearing and compression. Therefore, the geometry of the grinding teeth and grinding grooves has a crucial impact on refining efficiency and pulp quality. To improve pulp quality, modern grinding disc design tends to optimize the tooth and groove structure to achieve progressive refinement and full disintegration of fibers.

[0003] However, most existing grinding discs still employ relatively straight tooth groove structures, such as equidistant, radial, or simply curved shapes. While these facilitate processing and pulp flow, they also lead to rapid material passage through the grinding zone, short residence time, insufficient fiber treatment, and low grinding efficiency. Some improved designs use a wide and sparse grinding tooth structure at the inlet, gradually transitioning to a fine and narrow groove at the outlet to achieve gradient grinding. However, transverse barriers or continuous transverse ribs are often used to separate these areas. Excessive transverse structures can obstruct pulp flow, causing blockages and affecting continuous equipment operation and production output. Another design uses a tree-like branched groove structure to improve distribution uniformity. While this alleviates flow problems, the lack of effective shear enhancement and path guidance mechanisms means that pulp may still "short-circuit," resulting in insufficient grinding. This is especially problematic when dealing with coarse, hard fibers, high impurity content, or uneven textured raw materials. These structures struggle to provide sufficient grinding intensity and effective processing time, leading to incomplete fiber dissociation, unstable pulp quality, and significant defects. These toothed grinding discs were designed to produce better pulp quality even with slightly inferior raw materials, but current technology still struggles to meet this core requirement. Therefore, how to effectively extend the residence time of the pulp in the high-shear zone while ensuring smooth pulp flow, and improve its adaptability to inferior raw materials and pulp quality, remains a core challenge that current grinding disc technology urgently needs to overcome.

[0004] This utility model was developed precisely because of the aforementioned shortcomings. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a grinding disc for a pulping machine that improves grinding quality and production efficiency.

[0006] This utility model is achieved through the following technical solution:

[0007] This utility model provides a high-efficiency and energy-saving grinding disc for a pulping machine, including a grinding disc body. Several grinding disc bodies are spliced ​​together to form an annular grinding area. The grinding disc body has an inner arc edge close to the center and an outer arc edge away from the center. Its upper surface is a grinding end face, and a grinding groove is formed on the grinding end face.

[0008] The grinding groove extends from the inner arc edge to the outer arc edge, and a grinding ridge is formed between adjacent grinding grooves. A grinding dam connecting the two grinding ridges is provided in the grinding groove.

[0009] The grinding end face is divided into an inner grinding area, a transition area and an outer grinding area from the inner arc edge to the outer arc edge;

[0010] At least in the outer grinding zone, the grinding dams of the adjacent grinding grooves are arranged along a first linear direction, which is a straight direction and forms an acute angle with the radial direction;

[0011] At least in the outer grinding zone, the grinding dams of each pair or more adjacent grinding grooves are arranged along a second linear direction, which is arc-shaped and the center of the arc is offset from the center of the grinding area, or the second linear direction is spiral-shaped.

[0012] As described above, in the high-efficiency and energy-saving grinding mill discs, the grinding dams of every three adjacent grinding slots in the outer grinding zone are arranged along a second linear direction.

[0013] As described above, in the high-efficiency and energy-saving grinding disc of the pulper, the grinding grooves branch out multiple times in the extension direction to form a tree-like structure, and the groove width gradually decreases while the number of grooves distributed along the concentric circumference gradually increases.

[0014] As described above, the high-efficiency and energy-saving grinding disc of the pulper has a grinding end face parallel to the lower surface of the grinding disc body in the outer grinding zone, and a grinding end face in the inner grinding zone that gradually slopes towards the lower surface of the grinding disc body from the transition zone to the inner arc edge, with an inclination angle of α.

[0015] As described above, in the high-efficiency and energy-saving grinding mill disc, the bottom of the grinding groove forms the slurry surface. The slurry surface in the outer grinding area is parallel to the lower surface of the grinding disc body, and the slurry surface in the inner grinding area gradually slopes towards the lower surface of the grinding disc body from the transition area to the inner arc edge, with an inclination angle of β.

[0016] As described above, in the high-efficiency and energy-saving pulping mill disc, the first linear direction forms an acute angle γ with the radial direction of the pulping region.

[0017] The high-efficiency and energy-saving grinding discs for pulpers described above have a 0° < γ < 15°

[0018] In the high-efficiency and energy-saving grinding disc described above, the tangent of the second linear direction forms an acute angle θ with the circumferential tangent of the grinding region.

[0019] The high-efficiency and energy-saving grinding discs of the pulper, as described above, have a range of 10° < θ < 25°.

[0020] As described above, in the high-efficiency and energy-saving grinding mill grinding disc, the top of the grinding dam in the outer grinding zone is flush with the grinding end face, while the top of the grinding dam in the inner grinding zone is lower than the grinding end face and also lower than the top of the grinding dam in the outer grinding zone.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. Significantly improves grinding efficiency and fiber quality. By setting up a three-level gradient structure of inner grinding zone, transition zone and outer grinding zone, combined with the design of tree-like branching of grinding groove and gradual groove width, the continuous processing of fiber bundles "from coarse to fine, step by step dissociation" is achieved. With the oblique or spiral arrangement of grinding dam, the pulp is forced to jump to the grinding end face multiple times, prolonging the effective grinding path and time, so that the fibers are fully loosened, cut and filamentized, significantly improving the tensile index of the pulp (increased by 8%-15%) and the uniformity of pulp formation.

[0023] 2. Optimize slurry flow performance, prevent clogging and ensure stable operation. The grinding end face of the inner grinding zone is set with a reasonable inclination angle (α and β) to the slurry surface, which reduces the feeding resistance of large slurry particles and ensures smooth feeding. The height of the grinding dam gradually increases from the inside to the outside to form a pressure gradient and avoid local accumulation. The tree-like branched groove and inclined guide surface design further improve the slurry distribution and flow guidance, effectively prevent flow channel blockage, and improve the stability of equipment operation and maintenance cycle.

[0024] 3. Significantly reduces energy consumption, achieving energy-efficient and high-performance production. The inclined and spiral-arranged grinding dams enhance shearing action and grinding sufficiency without requiring additional power. Combined with the efficient gradient grinding structure, it significantly improves the processing capacity per unit of energy consumption. Practical applications show that this grinding disc is energy-efficient and highly effective, reducing power consumption per ton of slurry by 15% and significantly decreasing power consumption per unit of production capacity. At the same time, the slurry concentration is increased by 3%-5%, achieving multiple benefits of energy saving, quality improvement, and increased production. Attached Figure Description

[0025] Figure 1 This is a schematic diagram illustrating the structural principle of the high-efficiency and energy-saving grinding disc of this utility model;

[0026] Figure 2This is a schematic diagram of the upper surface structure of the high-efficiency and energy-saving grinding disc of the present invention;

[0027] Figure 3 This is a side view of the high-efficiency and energy-saving grinding disc of the present invention.

[0028] Figure 4 This is a partial structural diagram of the upper surface of the high-efficiency and energy-saving grinding disc of the present invention;

[0029] Figure 5 This is a partial structural diagram of the upper surface of the high-efficiency and energy-saving grinding disc of the present invention. Detailed Implementation

[0030] The utility model will be further described below with reference to the accompanying drawings:

[0031] The orientations described in this utility model specification, such as "up," "down," "left," "right," "front," and "back," are based on the orientations in the accompanying drawings and are intended to facilitate the description of the relationships between the various components. They do not indicate the unique or absolute positional relationships between the various components, but are merely one embodiment of the utility model and are not a limitation on its implementation.

[0032] This embodiment introduces a high-efficiency and energy-saving grinding disc for grinding processes in fiberboard, paper pulping, and plant feed, etc. The structure includes a grinding disc body 100, such as... Figure 1 As shown, multiple grinding disc bodies 100 are arranged along the circumferential direction and then spliced ​​together to form an annular grinding slurry region 200, with the center P of the grinding slurry region 200 as the center of rotation. This structural design enables multiple grinding discs to work together to form a continuous, uniform, and high-density grinding surface, which is suitable for dynamic grinding environments under high-speed rotation and ensures that the slurry is fully processed throughout the grinding slurry region 200.

[0033] like Figure 2 and Figure 3 As shown, with center P as the center, the grinding disc body 100 has an inner arc edge 101 close to center P and an outer arc edge 102 away from center P. Its upper surface is a grinding end face 11, and a grinding groove 12 is formed on the grinding end face 11; as Figure 2As shown, the grinding groove 12 extends from the inner arc edge 101 to the outer arc edge 102, and a grinding ridge 13 is formed between adjacent grinding grooves 12. A grinding dam 14 is provided within the grinding groove 12 to connect the two grinding ridges 13. The grinding groove 12 is opened to form the grinding ridge 13, and simultaneously allows the slurry to enter and move along the extension direction of the groove. The grinding ridge 13 increases friction and improves grinding efficiency. Since the grinding ridge 13 is formed by the grooves on both sides, it must extend in the same direction as the groove body. The grinding dam 14 can block the movement of the slurry within the groove body and can also facilitate grinding. A dam 14 is provided with an inclined guide surface near the inner arc edge 101, so that the moving thrust of the slurry when the grinding disc body 100 rotates will squeeze the slurry at the grinding dam 14. That is, but mainly the slurry needs to flow from the inlet end of the inner arc edge 101 to the outlet end of the outer arc edge 102 and continuously jump onto the grinding end face 11. In the gap between the two sets of grinding discs or grinding disks, the fibers are loosened, cut, crushed, and filamentized, thereby achieving a high-efficiency and high-quality grinding effect. The grinding groove 12 and the grinding ridge 13 together form a "groove-ridge" grinding unit, which is the core structure for achieving effective fiber dissociation. When the moving grinding disk drives the grinding disc body 100 to rotate at high speed, the slurry moves from the inside to the outside under the action of centrifugal force. At the same time, it is blocked by the grinding dam 14 and forced to jump upward to the grinding end face 11, entering the narrow grinding gap between the moving and stationary grinding discs. In this process, the fiber bundle is subjected to strong shearing, compression and friction, achieving progressive refinement. The grinding dam 14 not only serves as a physical barrier, but its inclined guide surface can also guide the slurry to transition smoothly, avoiding local accumulation or blockage and improving flow efficiency.

[0034] like Figure 2 and Figure 3 As shown, the grinding end face 11 is roughly divided into three regions, from the inner arc edge 101 to the outer arc edge 102, namely the inner grinding zone 103, the transition zone 104, and the outer grinding zone 105. The inner grinding zone 103 mainly undertakes the task of coarse grinding, processing the initially entering large-sized fiber bundles; the transition zone 104 plays a connecting role, gradually increasing the grinding intensity; the outer grinding zone 105 performs fine grinding, completing the final fiber separation and homogenization treatment. The three zones work together to achieve a gradient grinding process of "from coarse to fine, step-by-step deepening", which conforms to the material particle size variation law and significantly improves energy utilization efficiency.

[0035] like Figure 2 and Figure 5As shown, at least in the outer grinding zone 105, the grinding dams 14 of the adjacent grinding tanks 12 are arranged along a first linear direction L, which is a straight direction and forms an acute angle with the radial direction. Since the upward jump of the slurry is caused by the rotation of the grinding disc body 100 and the obstruction of the grinding dams 14, the slurry moves radially outward from the center P when it is squeezed onto the grinding end face 11, while also moving obliquely along the circumferential direction. Therefore, by arranging the grinding dams 14 of the adjacent grinding tanks 12 along the first linear direction L, the slurry is repeatedly squeezed from one grinding tank 12 to the grinding end face 11, then into another grinding tank 12, and then squeezed onto the grinding end face 11 again. This results in more times and more time for the slurry to enter the grinding end face 11 during its movement between the inlet and outlet ends, greatly improving the grinding efficiency. The setting of the first linear direction L changes the "short circuit" phenomenon caused by the traditional radial straight-through flow channel. As the slurry migrates outward, it is continuously "intercepted—lifted—re-introduced—re-intercepted" due to the oblique arrangement of the grinding dams 14, forming a multi-cycle grinding path. This "Z"-shaped or "serpentine" flow path extends the effective grinding stroke, enhances the shearing frequency, and improves the grinding efficiency per unit area. Simultaneously, the aforementioned structure allows the grinding dams 14 to be arranged more evenly in the selected direction and radial direction, thereby achieving a uniform distribution of the slurry and ultimately reducing the resistance of the slurry during its movement.

[0036] like Figure 2 and Figure 4 As shown, at least in the outer grinding zone 105, the grinding dams 14 of every three adjacent grinding grooves 12 are arranged along the second linear direction M, or the second linear direction M is spiral. With the arrangement along the first linear direction L, the slurry can still move and be discharged along a direction inclined radially, resulting in insufficient grinding. By arranging the grinding dams 14 of every three adjacent grinding grooves 12 along the spiral direction M, that is, the arrangement direction forms an acute angle with the tangent of the circumferential direction of the center P, the grinding dams 14 are arranged in multiple spiral directions. Combined with the rotation direction of the grinding disc body 100, this makes the approximate path of the slurry movement longer, resulting in more thorough grinding and improved grinding efficiency. The spiral arrangement of the grinding dams 14 works synergistically with the rotation direction of the grinding disc, forming a conveying effect similar to a "screw pump," which effectively controls the slurry flow rate and enhances the axial shear force. This structure is particularly suitable for high-concentration slurry processing, preventing local stagnation and improving grinding uniformity.

[0037] The second linear direction M can also be arc-shaped, but the center of the arc deviates from the center of the grinding area 200, thus making the direction of the arc approximately form an acute angle with the tangent of the circumferential direction of the center P, similar to the effect of a spiral direction. Alternatively, the grinding dams 14 of every two adjacent grinding tanks 12 can be arranged along the second linear direction M to achieve the desired effect, or the grinding dams 14 of every four adjacent grinding tanks 12 can be arranged along the second linear direction M. The design of the second linear direction M has good adjustability and adaptability, allowing for flexible adjustment of the arrangement density and angle according to different raw material characteristics (such as wood, bamboo, and grass fibers) and process requirements (coarse grinding, fine grinding, and pulping degree control), achieving customized grinding performance matching.

[0038] To be more detailed, such as Figure 5 As shown, the first linear direction L forms an acute angle γ with the radial direction D of the grinding region 200, where 0° < γ < 15°. An angle γ that is too large will cause the radial flow velocity of the slurry to be too fast, reducing the grinding time; an angle that is too small will easily cause clogging. Experiments have verified that the optimal balance between smooth flow and sufficient grinding can be achieved within the range of 0° < γ < 15°.

[0039] To be more detailed, such as Figure 4 As shown, the tangent of the second linear direction M forms an acute angle θ with the circumferential tangent C of the grinding region 200, where 10° < θ < 25°. Experiments have verified that controlling the angle θ between 10° and 25° can effectively prolong the residence time of the slurry in the grinding zone, while avoiding backflow or vortex phenomena and improving system stability.

[0040] In practical application tests, the grinding disc body 100 with the above-described structure increased the tensile index of the produced pulp by 8%-15% and the pulp concentration by 3%-5%, thereby improving production quality and capacity, while reducing energy consumption by 20%-35%. This technical solution, through innovative "multi-level partitioning + oblique / spiral grinding dam arrangement + gradient trough design," achieves the following significant advantages: energy efficiency, reducing power consumption per ton of pulp by 15% and significantly decreasing power consumption per unit capacity; improved quality and efficiency, increasing tensile index by 8%-15%, more complete fiber fibrillation, and higher paper strength; stable operation, with a reasonable flow channel design that is less prone to clogging and extends maintenance cycles; strong adaptability, suitable for various fiber raw materials and different pulping process requirements; gradient grinding, achieving a three-stage progressive treatment of "coarse → medium → fine," avoiding over-grinding or under-grinding; compact structure, achieving complex pulp trajectory control without additional power devices, and high integration.

[0041] As a preferred option, such as Figure 2As shown, the grinding grooves 12 branch out multiple times in the extending direction to form a tree-like structure, with the groove width gradually decreasing and the number of grooves distributed along the concentric circumference gradually increasing. The grinding grooves 12 have an inlet end at the inner arc edge 101 and an outlet end at the outer arc edge 102. The grinding grooves 12 and grinding ridges 13 at the inlet end are relatively sparse and wide compared to the outlet end, and become denser and narrower towards the outlet end. The purpose is to gradually break down and cut the originally large and long fiber bundles into smaller and shorter fiber bundles. Finally, these fiber bundles are processed into individual fibers by the dense grinding grooves 12 and grinding ridges 13, thereby significantly increasing the cutting length and ultimately improving the slurry quality. As a further preferred embodiment, in this embodiment, the groove width of the grinding groove 12 at the outlet end of the outer arc edge 102 can be designed differently according to each of the above-mentioned three adjacent grinding grooves 12. For example, the groove width of each of the three adjacent grinding grooves 12 can gradually increase or gradually decrease. The tree-like branching structure mimics the distribution of blood vessels or root systems in nature, achieving uniform distribution of slurry flow and reasonable control of pressure gradient. From the inside out, the groove width decreases while the number of grooves increases, conforming to the trend of gradually shrinking slurry volume and increasing fiber fineness, avoiding local high pressure or cavity phenomena, and improving grinding uniformity.

[0042] As a preferred option, such as Figure 3 As shown, the grinding end face 11 in the outer grinding zone 105 is parallel to the lower surface of the grinding disc body 100. The grinding end face 11 in the inner grinding zone 103 gradually slopes towards the lower surface of the grinding disc body 100 from the transition zone 104 to the inner arc edge 101, with an inclination angle of α, where 0° < α < 3°. Since the slurry particles and fiber bundles are smaller closer to the outer arc edge 102, the inclination angle design makes the feeding in the inner grinding zone 103 smoother and the grinding effect in the outer grinding zone 105 better. Similarly, the bottom of the grinding groove 12 forms the slurry flow surface 15. The slurry flow surface 15 in the outer grinding zone 105 is parallel to the lower surface of the grinding disc body 100. The slurry flow surface 15 in the inner grinding zone 103 gradually slopes towards the lower surface of the grinding disc body 100 from the transition zone 104 to the inner arc edge 101, with an inclination angle of β, where 2° < β < 5°. The inclined angles (α and β) on the inner region facilitate the smooth introduction of large slurry particles and reduce inlet resistance; while the parallel structure on the outer side helps to form a stable and uniform micro-gap grinding environment, improving the quality of fine grinding. The design of β angle being larger than α angle further enhances the flowability of the slurry surface, ensuring a smooth transition of the slurry to the high-shear zone.

[0043] Because the slurry particles and fiber bundles are larger closer to the inner arc edge 101 and smaller closer to the outer arc edge 102, the top of the grinding dam 14 in the outer grinding zone 105 is flush with the grinding end face 11, forcing the slurry to be extruded onto the grinding end face 11 as much as possible. The top of the grinding dam 14 in the inner grinding zone 103 is lower than the grinding end face 11 and also lower than the top of the grinding dam 14 in the outer grinding zone 105. This achieves a preliminary coarse grinding effect while ensuring that the slurry can move smoothly towards the outer grinding zone 105. The height of the grinding dam increases from the inside to the outside, forming a pressure gradient field of "low resistance introduction - gradual pressure increase - strong grinding". The lower inner grinding dam reduces initial resistance and prevents clogging; the outer, flush or even slightly convex grinding dam enhances shear strength, forcing the fibers to be fully exposed to the grinding action and improving the dissociation effect.

[0044] The above description is merely an embodiment of this utility model, and common knowledge regarding specific structures and characteristics is not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An energy efficient refiner plate characterized by: The device includes a grinding disc body (100), and several grinding disc bodies (100) are spliced ​​together to form an annular grinding slurry area (200). The grinding disc body (100) has an inner arc edge (101) close to the center and an outer arc edge (102) away from the center. Its upper surface is a grinding end face (11), and a grinding groove (12) is provided on the grinding end face (11). The grinding groove (12) extends along the direction from the inner arc edge (101) to the outer arc edge (102), and a grinding ridge (13) is formed between adjacent grinding grooves (12). A grinding dam (14) connecting the two grinding ridges (13) is provided in the grinding groove (12). The grinding end face (11) is divided into an inner grinding area (103), a transition area (104) and an outer grinding area (105) from the inner arc edge (101) to the outer arc edge (102); At least in the outer grinding area (105), the grinding dams (14) of the sequentially adjacent grinding grooves (12) are arranged along a first linear direction (L), which is a straight direction and forms an acute angle with the radial direction; At least in the outer grinding zone (105), the grinding dams (14) of each two or more adjacent grinding grooves (12) are arranged along a second linear direction (M), which is arc-shaped and the center of the arc is offset from the center of the grinding zone (200), or the second linear direction (M) is spiral-shaped.

2. The high-efficiency and energy-saving grinding disc for a pulper according to claim 1, characterized in that: In the outer grinding zone (105), the grinding dams (14) of every three adjacent grinding grooves (12) are arranged along the second linear direction (M).

3. The high-efficiency, energy-saving pulp mill refiner plate of claim 1, wherein: The grinding groove (12) branches multiple times in the extension direction to form a tree-like structure, and the groove width gradually decreases, while the number of grooves distributed along the concentric circumference gradually increases.

4. The high-efficiency and energy-saving grinding disc for a pulper according to any one of claims 1 to 3, characterized in that: The grinding end face (11) in the outer grinding area (105) is parallel to the lower surface of the grinding disc body (100). The grinding end face (11) in the inner grinding area (103) gradually tilts towards the lower surface of the grinding disc body (100) from the transition area (104) to the inner arc edge (101), with an tilt angle of α.

5. The energy efficient refiner plate of any one of claims 1 to 3, wherein: The bottom of the grinding groove (12) forms a slurry surface (15). The slurry surface (15) in the outer grinding area (105) is parallel to the lower surface of the grinding disc body (100). The slurry surface (15) in the inner grinding area (103) gradually slopes towards the lower surface of the grinding disc body (100) from the transition area (104) to the inner arc edge (101), with an inclination angle of β.

6. The high-efficiency, energy-saving pulp mill refiner plate of any one of claims 1 to 3, wherein: The first linear direction (L) forms an acute angle γ with the radial direction of the abrasive region (200).

7. The high-efficiency and energy-saving grinding disc for a pulper according to claim 6, characterized in that: 0° < γ < 15°.

8. The high-efficiency, energy-saving pulp mill refiner plate of any one of claims 1 to 3, wherein: The tangent of the second linear direction (M) forms an acute angle θ with the circumferential tangent of the grinding region (200).

9. The high-efficiency and energy-saving grinding disc for a pulper according to claim 8, characterized in that: 10° < θ < 25°.

10. The energy efficient refiner plate of any one of claims 1 to 3, wherein: The top of the grinding dam (14) of the outer grinding area (105) is flush with the grinding end face (11), and the top of the grinding dam (14) of the inner grinding area (103) is lower than the grinding end face (11) and lower than the top of the grinding dam (14) of the outer grinding area (105).

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