Design method for reducing ineffective circulation amount of mine roller mill

Abstract

The application discloses a method for reducing invalid circulation amount of a mine roller type crushing mill, and belongs to the field of ore crushing and grinding processing, and comprises the following steps: S1, according to the basic data of the mill design stage and the material easy grinding, the mill diameter Dt, the mill roller large end diameter Dr1, the mill roller small end diameter Dr2 and the mill roller width Br are determined according to the conventional design method of the mill selection; S2, the diameter of the feeding pipe is calculated; S3, a basic material blocking ring assembly is designed and made and arranged on the edge of the rotating mill disc; S4, an auxiliary material blocking ring assembly is designed and made and arranged above the basic material blocking ring assembly and fixedly connected to the inner wall of the middle shell; according to the application, the installation position of the auxiliary material blocking ring assembly is adjusted, the position and size of the discharging port are adjusted, and the angle and installation position of the guide plate are adjusted, so that the discharging of the materials with different flowabilities and different finished product particle sizes can be met, and the invalid circulation amount is reduced.

Description

Technical Field

[0001] This invention belongs to the field of ore crushing and grinding technology, and particularly relates to a method for reducing the ineffective circulation volume of a mining roller mill. Background Technology

[0002] Ore processing requires crushing and grinding according to the requirements of mineral processing equipment. Currently, the main equipment includes crushers, ball mills, and roller mills. Among them, roller mills are widely used due to their bed-grinding, large processing capacity, and high efficiency. During grinding, fresh feed is evenly distributed on the rotating grinding disc by centrifugal force and then thrown out from the edge of the disc. Because the grinding disc has a retaining ring at the edge, the material flow velocity is slow at the bottom and fast at the top. Fresh feed is generally in the top layer and is easily thrown to the edge by the grinding disc. Some is thrown out directly, while the rest accumulates at the base of the retaining ring and is squeezed out through the gap between the retaining ring and the grinding roller. This portion of fresh material, thrown out without being crushed by the grinding roller, further reduces the primary yield of the mill and increases the subsequent screening load, resulting in an inefficient cycle. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention provides a method for reducing the ineffective circulation volume of a mining roller mill.

[0004] This invention is implemented as follows: a design method for reducing the ineffective circulation volume of a mining roller mill, characterized by comprising the following steps: S1. Based on the basic data of the mill design time and the grindability of the material, determine the grinding disc diameter Dt, the large end diameter of the grinding roller Dr1, the small end diameter of the grinding roller Dr2, and the width of the grinding roller Br according to the conventional design method for mill selection. S2. Calculate the diameter φd of the feed pipe; S3. Design and fabricate the basic retaining ring assembly: S3.1 Structural design of the basic retaining ring assembly, wherein the basic retaining ring assembly includes a basic retaining ring; an annular boss is provided on the edge of the rotating grinding disc extending upward, and a groove is provided on the upper surface of the annular boss, the groove being used to engage the basic retaining ring, and the basic retaining ring assembly rotates simultaneously with the rotating grinding disc. S3.2 Parameter design of the basic retaining ring assembly; S4. Design and manufacture auxiliary baffle ring assemblies that are set above the basic baffle ring assembly and fixedly connected to the inner wall of the middle shell; the number of auxiliary baffle ring assemblies is the same as the number of grinding rollers, and a discharge port is formed between adjacent auxiliary baffle ring assemblies; S4.1 Design the structure of the auxiliary material retaining ring assembly. S4.2 Determine the design parameters of the auxiliary baffle ring assembly based on the fineness requirements of the finished material.

[0005] Furthermore, the auxiliary baffle ring assembly includes a fixed baffle plate, which is a quarter-circle ring. A guide plate and a support plate are fixedly connected to the inner sidewall of the fixed baffle plate. One end of the support plate is connected to the fixed baffle plate, and the other end of the support plate is connected to the guide plate. The other end of the guide plate is connected to the fixed baffle plate. The support plate is supported between the guide plate and the fixed baffle plate, so that the guide plate and the vertical center line of the rotating grinding disc form a guiding angle.

[0006] Alternatively, for materials with a particle size of less than 80 mm and good flowability, the first installation dimension of the auxiliary baffle ring assembly is designed to be 100~150 mm, the second installation dimension is designed to be 1500~2000 mm, the third installation dimension is designed to be 300~500 mm, the fourth installation dimension is designed to be 50~70 mm, and the guide angle between the guide plate and the vertical center line of the rotating grinding disc is designed to be 20~25 degrees.

[0007] Alternatively, for raw material particles larger than 80 mm with poor flowability: the first installation dimension of the auxiliary baffle ring assembly is designed to be 250~300 mm, the second installation dimension is designed to be 1000~1500 mm, the third installation dimension is designed to be 200~300 mm, the fourth installation dimension is designed to be 70~100 mm, and the guide angle between the guide plate and the vertical center line of the rotating grinding disc is designed to be 26~30 degrees.

[0008] Alternatively, for the case where the particle size radius of the finished powder is 100 micrometers and the sieve residue is less than 15%: the first installation dimension of the auxiliary baffle ring assembly is designed to be 250~300mm, the second installation dimension is designed to be 1000~1500mm, the third installation dimension is designed to be 300~500mm, the fourth installation dimension is designed to be 50~70mm, and the guide angle between the guide plate and the vertical center line of the rotating grinding disc is designed to be 20~25 degrees.

[0009] Alternatively, for cases where the particle size radius of the finished powder is 100 micrometers and the sieve residue is greater than 15%, the first installation dimension of the auxiliary baffle ring assembly is designed to be 100~150mm, the second installation dimension is designed to be 1000~1500mm, the third installation dimension is designed to be 200~300mm, the fourth installation dimension is designed to be 70~100mm, and the guide angle between the guide plate and the vertical center line of the rotating grinding disc is designed to be 26~30 degrees.

[0010] Furthermore, the height of the basic retaining ring assembly is designed to be 30~60mm.

[0011] Furthermore, the distance between the bottom surface of the auxiliary retaining ring assembly and the surface of the basic retaining ring assembly is set to 3~15mm.

[0012] Furthermore, the height of the fixed baffle is set to 150~300mm.

[0013] Furthermore, the number of grinding rollers can be selectively set to two, three, or four.

[0014] The advantages and technical effects of this invention are as follows: By adjusting the installation position of the auxiliary baffle ring assembly, the position and size of the discharge port, and the angle and installation position of the guide plate, this invention can meet the discharge requirements of materials with different flowability and different finished particle size, and reduce the amount of ineffective circulation.

[0015] In addition, 1. The present invention uses a design that combines dynamic and static elements of a double-layer baffle ring, and sets a guide plate on the auxiliary baffle ring assembly to guide the unground new material back to the grinding roller for grinding, thereby reducing the discharge of unground material and reducing the ineffective circulation of the mill.

[0016] 2. This invention sets a discharge port between the auxiliary retaining ring components to discharge the ground material in a timely manner. At the same time, with the fixed retaining ring and guide plate structure, the grinding roller maintains a reasonable material layer thickness, maintains stability, and maintains high grinding efficiency.

[0017] 3. This invention is easy to operate and quick to adjust, making it suitable for widespread use. Attached Figure Description

[0018] Figure 1 This is the front view of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is the invention Figure 1 Sectional view along the BB direction; Figure 4 This is a schematic diagram of the auxiliary baffle ring assembly structure of the present invention; Figure 5 This is the invention Figure 1 Enlarged view of a section at point C; Figure 6 This is the invention Figure 4 Schematic diagram of direction D.

[0019] In the diagram: 1. Middle shell; 2. Grinding roller; 3. Rocker arm; 4. Grinding roller support; 5. Auxiliary baffle ring assembly; 5a. Fixed baffle plate; 5b. Guide plate; 5c. Support plate; 6. Fixed plate; 7. Basic baffle ring assembly; 8. Rotating grinding disc; 9. Feed pipe; 10. Discharge port; 11. Guide plate notch; 12. Annular boss; 13. Basic baffle ring; a. Guide angle; L1. First installation dimension; L2. Second installation dimension; L3. Third installation dimension; L4. Fourth installation dimension. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] In the traditional baffle structure of roller mills, to form a stable material layer, a basic baffle ring, integrated with the grinding disc, is installed on the outer side of the grinding disc. This basic baffle ring is typically 100-200mm high. The material on the rotating grinding disc 8 is blocked by the basic baffle ring. Because the upper layer of material moves faster than the lower layer, and freshly fed material is generally on the upper layer, it is easily thrown to the edge of the rotating grinding disc 8. Some of this freshly fed material is thrown out directly, while the rest accumulates at the base of the basic baffle ring and is squeezed out through the gap between the basic baffle ring and the rotating grinding disc 8. To prevent this freshly fed material from being thrown out, the height of the baffle ring is often increased, or an additional baffle is added to the grinding roller to block the material that is thrown out directly without being ground. However, these methods increase the thickness of the grinding layer on the grinding roller, reducing grinding efficiency, increasing power consumption, and causing ineffective cycles in the mill.

[0022] To address the aforementioned problems, this invention proposes a design method for reducing the ineffective circulation volume of a mining roller mill. First, the structure employed in this method is introduced; see reference [link to relevant documentation]. Figures 1 to 6 Taking two grinding rollers as an example, since the roller mill involved is existing technology, the accompanying drawings only show the structure of the parts related to the present invention.

[0023] The mining roller mill includes a middle shell 1, which is fixed on a grinding roller support 4. The grinding roller support 4 is fixed to a ground foundation. It encloses the grinding structure in the middle, providing a sealing and protection function. A rotating grinding disc 8 is installed inside the middle shell 1. The rotating grinding disc 8 is driven to rotate by a motor reducer located at its lower part. A feed pipe 9 is installed through the side wall of the middle shell 1. The discharge port of the feed pipe 9 is obliquely downward above the rotating grinding disc 8. The position of the feed pipe 9 is perpendicular to the rocker arm 3. The material falls onto the rotating grinding disc 8 through the feed pipe 9. Due to the continuous rotation of the rotating grinding disc 8, the material is evenly dispersed and forms a dynamic material bed on the upper surface of the rotating grinding disc 8 under the action of centrifugal force, and is finally thrown out of the rotating grinding disc 8.

[0024] A grinding roller support 4 is symmetrically arranged on the outer side of the middle shell 1. A rocker arm 3 is hinged to the grinding roller support 4. The other end of the rocker arm 3 extends into the middle shell 1 and is fixedly connected to the central rotating shaft of the grinding roller 2. The rocker arm 3 is inclined towards the upper surface of the rotating grinding disc 8, so that the grinding roller 2 is pressed on the rotating grinding disc 8. Driven by the rotating grinding disc 8, the grinding roller 2 rotates along its own central rotating shaft, thereby crushing the material on the rotating grinding disc 8 to form a material bed grinding.

[0025] A basic retaining ring assembly 7 is fixedly connected to the edge of the rotating grinding disc 8. The basic retaining ring assembly 7 is stationary relative to the rotating grinding disc 8 and includes a basic retaining ring 13. An annular boss 12 extends upwards around the edge of the rotating grinding disc 8. A groove is provided on the upper surface of the annular boss 12 to engage the basic retaining ring 13, thus fixing the basic retaining ring 13 to the rotating grinding disc 8, allowing it to rotate simultaneously with the grinding disc 8. The annular boss 12 allows the basic retaining ring 13 to bear greater force, absorbing the pressure exerted on it by the sides during grinding by the grinding roller 2. The surface of the basic retaining ring 13 is machined to ensure flatness, facilitating the discharge of ground material. Depending on the type of ore and particle size, the height of the basic retaining ring 13 is designed to be 30-60mm, significantly lower than traditional retaining rings, making material discharge easier.

[0026] To ensure the stability of grinding by the grinding rollers, a second layer of baffle rings, namely auxiliary baffle ring assembly 5, is designed. The auxiliary baffle ring assembly 5 is fixedly connected to the inner wall of the middle shell 1. When the rotating grinding disc 8 rotates, the auxiliary baffle ring assembly 5 rotates relative to the rotating grinding disc 8. There are two auxiliary baffle ring assemblies 5, which extend from the near end of the grinding roller 2 to the far end of the grinding roller 2, that is, from the feed side of the grinding roller 2 along the rotation direction of the rotating grinding disc 8 to the discharge side of the grinding roller 2. Two discharge ports 10 are formed between the two auxiliary baffle ring assemblies 5, which facilitate the discharge of the ground material.

[0027] The auxiliary baffle ring assembly 5 includes a fixed baffle 5a, which is a quarter-circle ring. A guide plate 5b and a support plate 5c are welded to the side wall of the fixed baffle 5a. The guide plate 5b is located at the front of the feed end of the grinding roller 2. The height of the guide plate 5b is the same as the height of the fixed baffle 5a, which facilitates guiding the material to the lower side of the grinding roller 2. A guide plate notch 11 is provided on the discharge side of the guide plate 5b. The guide plate notch 11 cooperates with the grinding roller 2 to facilitate the overflow of material along the guide plate 5b to the lower side of the grinding roller 2.

[0028] One end of the support plate 5c is welded to the fixed baffle 5a, and the other end of the support plate 5c is welded to the guide plate 5b. The other end of the guide plate 5b is welded to the fixed baffle 5a. The support plate 5c is supported between the guide plate 5b and the fixed baffle 5a, so that the guide plate 5b and the vertical center line of the rotating grinding disc 8 form a guiding angle α. The direction of the guiding angle α is opposite to the rotation direction of the rotating grinding disc 8. By adjusting the position and size of the discharge port 10 slot, as well as the guiding angle α and the distance between the guide plate 5b and the grinding roller 2, the discharge of materials with different flowability and fineness requirements can be met, reducing the amount of ineffective circulation.

[0029] A fixing plate 6 is welded to the outside of the fixing baffle 5a. Preferably, four fixing plates 6 are provided. The four fixing plates 6 are radially distributed between the fixing baffle 5a and the middle shell 1, and the fixing baffle 5a is welded to the middle shell 1 and located above the basic retaining ring 13.

[0030] The inner diameter of the fixed baffle 5a is larger than the inner diameter of the base retaining ring 13, and the outer diameter of the fixed baffle 5a is smaller than the outer diameter of the base retaining ring 13, so as to facilitate adjustment of the distance between the fixed baffle 5a and the base retaining ring 13. This arrangement ensures that the fixed baffle 5a is projected inside the top surface of the base retaining ring 13, guaranteeing that the maximum gap between them is the vertical gap. If the fixed baffle 5a is projected outside the base retaining ring 13, there will be misalignment between them, and the vertical gap will not be the maximum gap between them; the misaligned gap will be larger than the vertical gap, resulting in excessive material being discharged from the misaligned gap. The height of the bottom surface of the fixed baffle 5a from the top surface of the base retaining ring 13 is set to 3~15mm; the distance should be as small as possible without causing friction. The height of the fixed baffle 5a is set to 150~300mm; a higher value is chosen to avoid interference with the grinding roller 2.

[0031] This invention utilizes two auxiliary baffle ring assemblies 5 welded to the inner shell 1 to form a guide plate notch 11 between the auxiliary baffle ring assemblies 5. This guide plate notch 11 is intentionally reserved on the side where the material has been crushed by the grinding roller 2, allowing the crushed material to be discharged promptly through the guide plate notch 11. A fixed baffle 5a is positioned on the side of the grinding roller 2 that is crushing the material feed. The fixed baffle 5a blocks all the newly fed material from the feed pipe 9, retaining it on the rotating grinding disc 8. Furthermore, because a guide plate 5b is welded to the fixed baffle 5a, the material inside the fixed baffle 5a is guided to the front end of the grinding roller 2 feed. As the rotating grinding disc 8 rotates, the material enters the grinding roller 2 for grinding. This ensures that the ground material is discharged promptly and that unground material is guided to the grinding roller 2 for grinding. Through the structural design of this invention, the ground material is promptly discharged outside the rotating grinding disc 8, and the material guided by the guide plate 5b does not increase the thickness of the grinding layer on the grinding roller 2, thus ensuring grinding efficiency.

[0032] Furthermore, the number of grinding rollers 2 can be set to two, three, or four.

[0033] The design method for reducing ineffective circulation in mining roller mills includes the following steps: S1. Based on the basic data of the mill design time and the grindability of the material, determine the grinding disc diameter Dt, the large end diameter of the grinding roller Dr1, the small end diameter of the grinding roller Dr2, and the width of the grinding roller Br according to the conventional design method for mill selection. S2. Calculate the diameter φd of the feed pipe; S3. Design and fabricate the basic retaining ring assembly 7: S3.1 Structural design of the basic retaining ring assembly: The basic retaining ring assembly 7 includes a basic retaining ring 13; the edge of the rotating grinding disc 8 extends upward and is provided with an annular boss 12, and the upper end face of the annular boss 12 is provided with a groove for engaging the basic retaining ring 13; the basic retaining ring assembly 7 rotates simultaneously with the rotating grinding disc 8. S3.2 Parameter design of the basic retaining ring assembly; S4. Design and manufacture an auxiliary baffle ring assembly 5 that is set above the basic baffle ring assembly 7 and fixedly connected to the inner wall of the middle shell 1; and form a discharge port 10 between the auxiliary baffle ring assemblies 5; S4.1 Design the structure of the auxiliary material retaining ring assembly; S4.2 Determine the design parameters of the auxiliary baffle ring assembly 5 according to the fineness requirements of the finished material.

[0034] Design parameters of auxiliary baffle ring assembly 5: 1. For raw material particles smaller than 80 mm with good flowability; the first installation dimension L1 of the auxiliary baffle ring assembly 5 is designed to be 100~150 mm, the second installation dimension L2 is designed to be 1500~2000 mm, the third installation dimension L3 is designed to be 300~500 mm, the fourth installation dimension L4 is designed to be 50~70 mm, and the guide angle α between the guide plate 5b and the vertical center line of the rotating grinding disc 8 is designed to be 20~25 degrees.

[0035] 2. For raw material particles larger than 80 mm with poor flowability: the first installation dimension L1 of the auxiliary baffle ring assembly 5 is designed to be 250~300 mm, the second installation dimension L2 is designed to be 1000~1500 mm, the third installation dimension L3 is designed to be 200~300 mm, the fourth installation dimension L4 is designed to be 70~100 mm, and the guide angle α between the guide plate 5b and the vertical center line of the rotating grinding disc 8 is designed to be 26~30 degrees.

[0036] III. For the case where the particle size radius of the finished material is 100 micrometers and the sieve residue is less than 15%: the first installation dimension L1 of the auxiliary baffle ring assembly 5 is designed to be 250~300mm, the second installation dimension L2 is designed to be 1000~1500mm, the third installation dimension L3 is designed to be 300~500mm, the fourth installation dimension L4 is designed to be 50~70mm, and the guide angle α between the guide plate 5b and the vertical center line of the rotating grinding disc 8 is designed to be 20~25 degrees.

[0037] IV. For the case where the particle size radius of the finished material is 100 micrometers and the sieve residue is greater than 15%: the first installation dimension L1 of the auxiliary baffle ring assembly 5 is designed to be 100~150mm, the second installation dimension L2 is designed to be 1000~1500mm, the third installation dimension L3 is designed to be 200~300mm, the fourth installation dimension L4 is designed to be 70~100mm, and the guide angle α between the guide plate 5b and the vertical center line of the rotating grinding disc 8 is designed to be 26~30 degrees.

[0038] The aforementioned first installation dimension L1 is the distance extended from one end of the fixed baffle 5a through the transverse centerline of the rotating grinding disc 8; the second installation dimension L2 is the distance from one end of the guide plate 5b to the longitudinal centerline of the rotating grinding disc 8; the third installation dimension L3 is the distance extended from the other end of the fixed baffle 5a through the longitudinal centerline of the rotating grinding disc 8; and the fourth installation dimension L4 is the distance from the other end of the guide plate 5b to the edge of the grinding roller 2. It should be noted that when there is a conflict between the raw material particle size parameters and the finished product particle size parameters, the design parameters of the auxiliary baffle ring assembly 5 should be selected according to the finished product particle size parameters.

[0039] The design parameters of the basic retaining ring assembly 7 are as follows: The basic retaining ring assembly 7 includes a basic retaining ring 13, and the height of the basic retaining ring 13 is determined to be 30~60mm through experiments.

[0040] The relative positional parameters between the auxiliary retaining ring assembly 5 and the basic retaining ring assembly 7 are as follows: The height of the bottom surface of the fixed baffle 5a from the top surface of the base baffle ring 13 is set to 3~15mm. The distance between the two should be as small as possible without scratching.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A design method for reducing the ineffective circulation volume of a mining roller mill, characterized in that, Includes the following steps: S1. Based on the basic data of the mill design time and the grindability of the material, determine the grinding disc diameter Dt, the large end diameter of the grinding roller Dr1, the small end diameter of the grinding roller Dr2, and the width of the grinding roller Br according to the conventional design method for mill selection. S2. Calculate the diameter φd of the feed pipe; S3. Design and fabricate the basic retaining ring assembly (7): S3.1 Structural design of the basic retaining ring assembly: The basic retaining ring assembly (7) includes a basic retaining ring (13); the edge of the rotating grinding disc (8) extends upward and is provided with an annular platform (12), and the upper end face of the annular boss (12) is provided with a slot, which is used to engage the basic retaining ring (13). The basic retaining ring assembly (7) rotates simultaneously with the rotating grinding disc (8). S3.2 Parameter design of the basic retaining ring assembly; S4. Design and manufacture an auxiliary baffle ring assembly (5) that is set above the basic baffle ring assembly (7) and fixedly connected to the inner wall of the middle shell (1); the number of auxiliary baffle ring assemblies (5) is the same as the number of grinding rollers (2), and a discharge port (10) is formed between adjacent auxiliary baffle ring assemblies (5). In step S4, the auxiliary baffle ring assembly (5) includes a fixed baffle (5a), which is a quarter-circle ring. A guide plate (5b) and a support plate (5c) are fixedly connected to the inner side wall of the fixed baffle (5a). One end of the support plate (5c) is connected to the fixed baffle (5a), and the other end of the support plate (5c) is connected to the guide plate (5b). The other end of the guide plate (5b) is connected to the fixed baffle (5a). The support plate (5c) is supported between the guide plate (5b) and the fixed baffle (5a), so that the guide plate (5b) and the vertical center line of the rotating grinding disc (8) form a guiding angle (a). S4.1 Design the structure of the auxiliary material retaining ring assembly. S4.

2. Based on the fineness requirements of the finished material, determine the design parameters of the auxiliary baffle ring assembly (5); the first installation dimension (L1) is the distance extended by one end of the fixed baffle (5a) through the transverse center line of the rotating grinding disc (8); the second installation dimension (L2) is the distance from one end of the guide plate (5b) to the longitudinal center line of the rotating grinding disc (8); the third installation dimension (L3) is the distance extended by the other end of the fixed baffle (5a) through the longitudinal center line of the rotating grinding disc (8); and the fourth installation dimension (L4) is the distance from the other end of the guide plate (5b) to the edge of the grinding roller (2).

2. The design method for reducing the ineffective circulation volume of a mining roller mill according to claim 1, characterized in that: For raw materials with a particle size of less than 80 mm, good fluidity, and a thin material layer after crushing, the first installation dimension (L1) of the auxiliary baffle ring assembly (5) is designed to be 100~150 mm, the second installation dimension (L2) is designed to be 1500~2000 mm, the third installation dimension (L3) is designed to be 300~500 mm, the fourth installation dimension (L4) is designed to be 50~70 mm, and the guide angle (a) between the guide plate (5b) and the vertical center line of the rotating grinding disc (8) is designed to be 20~25 degrees.

3. The design method for reducing the ineffective circulation volume of a mining roller mill according to claim 1, characterized in that: For raw materials with a particle size greater than 80 mm, poor flowability, and thick material layer after compaction, the first installation dimension (L1) of the auxiliary baffle ring assembly (5) is designed to be 250~300 mm, the second installation dimension (L2) is designed to be 1000~1500 mm, the third installation dimension (L3) is designed to be 200~300 mm, the fourth installation dimension (L4) is designed to be 70~100 mm, and the guide angle (a) between the guide plate (5b) and the vertical center line of the rotating grinding disc (8) is designed to be 26~30 degrees.

4. The design method for reducing the ineffective circulation volume of a mining roller mill according to claim 1, characterized in that: For cases where the fineness of the finished product is required to be fine, i.e. the particle size radius of the ground finished product is 100 micrometers and the sieve residue is less than 15%, the first installation dimension (L1) of the auxiliary baffle ring assembly (5) is designed to be 250~300mm, the second installation dimension (L2) is designed to be 1000~1500mm, the third installation dimension (L3) is designed to be 300~500mm, the fourth installation dimension (L4) is designed to be 50~70mm, and the guide angle (a) between the guide plate (5b) and the vertical center line of the rotating grinding disc (8) is designed to be 20~25 degrees.

5. The design method for reducing the ineffective circulation volume of a mining roller mill according to claim 1, characterized in that: For cases where the fineness of the finished product is required to be relatively coarse, i.e. the particle size radius of the ground finished product is 100 micrometers and the sieve residue is greater than 15%, the first installation dimension (L1) of the auxiliary baffle ring assembly (5) is designed to be 100~150mm, the second installation dimension (L2) is designed to be 1000~1500mm, the third installation dimension (L3) is designed to be 200~300mm, the fourth installation dimension (L4) is designed to be 70~100mm, and the guide angle (a) between the guide plate (5b) and the vertical center line of the rotating grinding disc (8) is designed to be 26~30 degrees.

6. The design method for reducing the ineffective circulation volume of a mining roller mill according to any one of claims 1 to 5, characterized in that: The height of the basic retaining ring (13) mentioned in step S3.1 is designed to be 30~60mm.

7. The design method for reducing the ineffective circulation volume of a mining roller mill according to claim 6, characterized in that: In step S4, the distance between the bottom surface of the auxiliary retaining ring assembly (5) and the top surface of the basic retaining ring assembly (7) is set to 3~15mm.

8. The design method for reducing the ineffective circulation volume of a mining roller mill according to claim 1, characterized in that: The height of the fixed baffle (5a) is set to 150~300mm.

9. The design method for reducing the ineffective circulation volume of a mining roller mill according to claim 1, characterized in that: In step S1, the number of grinding rollers (2) can be selectively set to two, three or four.

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