Design method for reducing ineffective circulation amount of mining roller type comminutor

Abstract

The invention discloses a method for reducing invalid circulation volume of a mining roller type comminutor, which belongs to the field of ore crushing and grinding processing, and comprises the following steps: S1, according to basic data of comminutor design machine hour and material grindability, determining the diameter Dt of a millstone, the diameter Dr1 of the large end of a grinding roller, the diameter Dr2 of the small end of the grinding roller and the width Br of the grinding roller according to a comminutor model selection conventional design method; s2, the diameter phi d of the feeding pipe is calculated; s3, a basic retaining ring assembly arranged on the edge of the rotary millstone is designed and manufactured; S4, an auxiliary retaining ring assembly arranged above the basic retaining ring assembly and fixedly connected to the inner wall of the middle shell is designed and manufactured; by adjusting the mounting position of the auxiliary retaining ring assembly, the position and the size of the discharge port and the angle and the mounting position of the guide plate, discharge of materials with different flowability and different finished product particle size requirements can be met, and the ineffective circulation amount is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of ore crushing and grinding processing, and particularly relates to a method for reducing the ineffective circulation amount of a roller type ore mill. Background Art

[0002] In 2023, the global output of major metals was approximately 250 million tons, and the annual ore volume processed by ore dressing was approximately 3 billion tons; the steel output was approximately 1.6 billion tons, and the annual ore volume processed by ore dressing was approximately 3 billion tons. As an industrial power, China processes approximately 1.5 billion tons of ore annually. The processing of ore requires crushing and grinding of the ore according to the requirements of ore dressing equipment. The current main equipment includes crushers, ball mills, and roller type ore mills. Among them, the roller type ore mill is widely used because of its characteristics of bed grinding, large processing capacity, and high efficiency. During grinding, the new feed is evenly spread on the grinding table by the rotation of the grinding table and the centrifugal force, and then is thrown out from the edge of the grinding table. Since a retaining ring is designed at the edge of the grinding table, the flow rate of the bottom layer of the material on the grinding table is slow, and the flow rate of the upper layer is fast. And the new feed is generally in the upper layer and is easily thrown to the edge by the grinding table. Part of it is directly thrown out, and the other part accumulates at the root of the retaining ring and is extruded from the gap between the retaining ring and the grinding roller. This part of the new material that is directly thrown out without being rolled by the grinding roller reduces the primary product rate of the mill powder grinding and increases the subsequent screening load, which is an ineffective cycle. Summary of the Invention

[0003] Aiming at the problems existing in the prior art, the present invention provides a method for reducing the ineffective circulation amount of a roller type ore mill.

[0004] The present invention is implemented as follows. A design method for reducing the ineffective circulation amount of a roller type ore mill is characterized by including the following steps:

[0005] S1. According to the basic data of the designed hourly output of the ore mill and the grindability of the material, determine the grinding table diameter Dt, the large end diameter Dr1 of the grinding roller, the small end diameter Dr2 of the grinding roller, and the grinding roller width Br according to the conventional design method for ore mill selection;

[0006] S2. Calculate the diameter φd of the feed pipe;

[0007] S3. Design and manufacture a basic retaining ring assembly:

[0008] S3.1. Structural design of the basic retaining ring assembly. The basic retaining ring assembly includes a basic retaining ring; a circular convex platform extends upward from the edge of the rotating grinding table, and a notch is provided on the upper end surface of the circular convex platform for clamping the basic retaining ring, and the basic retaining ring assembly rotates simultaneously with the rotating grinding table;

[0009] S3.2. Parameter design of the basic retaining ring assembly;

[0010] S4. Design and fabricate an auxiliary material retaining ring assembly that is disposed above the base material retaining ring assembly and fixedly connected to the inner wall of the middle housing; the number of the auxiliary material retaining ring assemblies is the same as the number of grinding rollers, and a discharge opening is formed between adjacent auxiliary material retaining ring assemblies;

[0011] S4.1. Design the structure of the auxiliary material retaining ring assembly,

[0012] S4.2. Determine the design parameters of the base material retaining ring assembly according to the fineness requirements of the finished material.

[0013] Furthermore, the auxiliary material retaining ring assembly includes a fixed baffle. The fixed baffle is a quarter ring. A guiding plate and a support plate are fixedly connected to the inner side wall of the fixed baffle. One end of the support plate is connected to the fixed baffle, the other end of the support plate is connected to the guiding plate, and the other end of the guiding plate is connected to the fixed baffle; the support plate is supported between the guiding plate and the fixed baffle, so that the guiding plate forms a material guiding angle with the vertical center line of the rotating grinding disc.

[0014] Or, for the case where the particle size of the material is less than 80 mm and the fluidity is good; the first installation dimension of the auxiliary material retaining 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 material guiding angle formed by the guiding plate and the vertical center line of the rotating grinding disc is designed to be 20 - 25 degrees.

[0015] Or, for the case where the particle size of the raw material is greater than 80 mm and the fluidity is poor: the first installation dimension of the auxiliary material retaining 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 material guiding angle formed by the guiding plate and the vertical center line of the rotating grinding disc is designed to be 26 - 30 degrees.

[0016] Or, for the case where the radius of the ground finished product particle size is 100 microns and the sieve residue is less than 15%: the first installation dimension of the auxiliary material retaining 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 300 - 500 mm, the fourth installation dimension is designed to be 50 - 70 mm, and the material guiding angle formed by the guiding plate and the vertical center line of the rotating grinding disc is designed to be 20 - 25 degrees.

[0017] Alternatively, for the case where the particle size radius of the ground product is 100 microns and the residue on sieve is greater than 15%: 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 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 material guiding angle formed between the guiding plate and the vertical center line of the rotating grinding table is designed to be 26 - 30 degrees.

[0018] Furthermore, the height of the basic baffle ring assembly is designed to be 30 - 60 mm.

[0019] Furthermore, the distance between the bottom surface of the auxiliary baffle ring assembly and the surface of the basic baffle ring assembly is set to be 3 - 15 mm.

[0020] Furthermore, the height of the fixed baffle is set to be 150 - 300 mm.

[0021] Furthermore, the number of grinding rollers is selectively set to two, three or four.

[0022] Advantages and technical effects of the present invention: By adjusting the installation position of the auxiliary baffle ring assembly, adjusting the position and size of the discharge port, and simultaneously adjusting the angle and installation position of the guiding plate, the present invention can meet the discharge requirements of materials with different fluidities and different finished product particle sizes, and reduce the situation of ineffective circulation.

[0023] In addition, 1. Through the design of combining dynamic and static of the double-layer baffle ring in the present invention, and by arranging a guiding plate on the auxiliary baffle ring assembly, the unground new material is re-guided to the grinding roller for grinding, reducing the discharge of unground materials and reducing the ineffective circulation of the mill.

[0024] 2. By arranging a discharge port between the auxiliary baffle ring assemblies in the present invention, the ground materials are discharged in a timely manner. Meanwhile, in cooperation with the fixed baffle ring and the guiding plate structure, the grinding roller grinding maintains a reasonable material layer thickness, maintaining stability while maintaining high grinding efficiency.

[0025] 3. The present invention is easy to operate and quick to adjust, and is suitable for large-scale popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the front view of the present invention;

[0027] Figure 2 is the top view of the present invention;

[0028] Figure 3 is the Figure 1 sectional view taken along line B - B of the present invention;

[0029] Figure 4 is the structural schematic diagram of the auxiliary baffle ring assembly of the present invention;

[0030] Figure 5 is the partial enlarged view at C in the present invention Figure 1 ;

[0031] Figure 6 is the schematic view in the D direction of the present invention Figure 4 ;

[0032] In the figure: 1, middle housing; 2, grinding roller; 3, rocker arm; 4, grinding roller support; 5, auxiliary material baffle ring assembly; 5a, fixed baffle; 5b, guiding plate; 5c, support plate; 6, fixing plate; 7, basic material baffle ring assembly; 8, rotating grinding disc; 9, feed pipe; 10, discharge port; 11, guiding plate notch; 12, annular boss; 13, basic material baffle ring; a, material guiding angle; L1, first installation dimension; L2, second installation dimension; L3, third installation dimension; L4, fourth installation dimension. Specific embodiments

[0033] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] For the traditional material baffle structure of the roller mill, in order to form a stable material layer for the material, a basic material baffle ring integrated with the grinding disc is provided on the outer side of the grinding disc. Usually, the height of the basic material baffle ring is 100 - 200 mm. The material on the rotating grinding disc 8 is blocked by the basic material baffle ring. Also, since the upper-layer material moves fast and the lower-layer material moves slowly, and the newly fed material is generally in the upper layer, it is very easy to be thrown to the edge of the rotating grinding disc 8. Part of the newly fed material is directly thrown out, and the other part accumulates at the root of the basic material baffle ring and is extruded from the gap between the basic material baffle ring and the rotating grinding disc 8. In order to prevent this part of the newly fed material from being thrown out, methods such as increasing the height of the baffle ring or additionally adding a baffle on the grinding roller are often used to block the material that is directly thrown out without being ground. However, these methods will increase the thickness of the grinding material layer of the grinding roller, reduce the grinding efficiency, increase the power consumption, and cause an ineffective cycle of the mill.

[0035] In view of the above problems, the present invention proposes a design method for reducing the ineffective cycle amount of the mining roller mill. First, the structure adopted by this method is introduced. Refer to Figures 1 to 6 , taking two grinding rollers as an example. Since the involved roller mill is prior art, only the structure related to the present invention is shown in the drawings.

[0036] The roller mill for mines includes a middle housing 1, which is fixed on the grinding roller support 4, and the grinding roller support 4 is fixed on the ground foundation. It wraps the grinding structure in the middle, playing a role of sealing and protection. A rotating grinding disc 8 is arranged inside the middle housing 1. The rotating grinding disc 8 is driven to rotate by a motor reducer arranged below it. A feed pipe 9 penetrates through the side wall of the middle housing 1. The discharge port of the feed pipe 9 is arranged obliquely downward above the rotating grinding disc 8. The setting 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 spread out and forms a dynamic material bed on the upper surface of the rotating grinding disc 8 under the action of centrifugal force, and finally is thrown out of the rotating grinding disc 8.

[0037] Grinding roller supports 4 are symmetrically arranged on the outside of the middle housing 1. A rocker arm 3 is hinged on the grinding roller support 4. The other end of the rocker arm 3 extends into the middle housing 1, and this other end 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 presses on the rotating grinding disc 8. Driven by the rotating grinding disc 8, the grinding roller 2 rotates along its own central rotating shaft at the same time, and then rolls the material on the rotating grinding disc 8 to form material bed grinding.

[0038] A basic material retaining ring assembly 7 is fixedly connected to the edge of the rotating grinding disc 8. The basic material retaining ring assembly 7 is relatively stationary with the rotating grinding disc 8. The basic material retaining ring assembly 7 includes a basic material retaining ring 13. The edge of the rotating grinding disc 8 extends upward in a circular shape to form an annular boss 12. A notch is arranged on the upper end surface of the annular boss 12. The notch is used to clamp the basic material retaining ring 13, and then the basic material retaining ring 13 is fixed on the rotating grinding disc 8, so that the basic material retaining ring 13 rotates with the rotating grinding disc 8 at the same time. The setting of the annular boss 12 can enable the basic material retaining ring 13 to bear a large force to bear the extrusion of the side of the basic material retaining ring 13 by the grinding roller 2 during grinding. The surface of the basic material retaining ring 13 is machined to ensure the flatness of the surface, which is beneficial to the discharge of the ground material. According to different ore types and raw material particle sizes, the height of the basic material retaining ring 13 is designed to be 30 - 60 mm, which is greatly reduced compared with the height of the traditional material retaining ring, and the material is easily discharged.

[0039] In order to ensure the stability of the grinding roller grinding, a second layer of material retaining ring, that is, an auxiliary material retaining ring assembly 5, is designed. The auxiliary material retaining ring assembly 5 is fixedly connected to the inner wall of the middle housing 1. When the rotating grinding disc 8 rotates, the auxiliary material retaining ring assembly 5 rotates relative to the rotating grinding disc 8. The auxiliary material retaining ring assembly 5 is arranged in two, and respectively extends from the proximal end of the grinding roller 2 to the distal end of the grinding roller 2, that is, from the feeding side of the grinding roller 2 along the rotation direction of the rotating grinding disc 8 to the discharging side of the grinding roller 2. Two discharge ports 10 are formed between the two auxiliary material retaining ring assemblies 5, and the discharge ports 10 are convenient for the discharged ground material to be discharged.

[0040] The auxiliary material retaining ring assembly 5 includes a fixed piece 5a which is a quarter ring. A guiding plate 5b and a supporting plate 5c are welded to the side wall of the fixed piece 5a. The guiding plate 5b is arranged in front of the feeding end of the grinding roller 2. The height of the guiding plate 5b is the same as that of the fixed piece 5a, which is convenient for guiding the material to the lower side of the grinding roller 2. A guiding plate notch 11 is arranged on the discharging side of the guiding plate 5b. The guiding plate notch 11 cooperates with the grinding roller 2 to facilitate the material to overflow along the guiding plate 5b to the lower side of the grinding roller 2.

[0041] One end of the supporting plate 5c is welded to the fixed piece 5a, the other end of the supporting plate 5c is welded to the guiding plate 5b, and the other end of the guiding plate 5b is welded to the fixed piece 5a. The supporting plate 5c is supported between the guiding plate 5b and the fixed piece 5a, so that the guiding plate 5b forms a material guiding angle a with the vertical center line of the rotating grinding disc 8. The setting direction of the material guiding angle a is opposite to the rotating direction of the rotating grinding disc 8. By adjusting the position and size of the notch of the discharging port 10, the material guiding angle a and the distance between the guiding plate 5b and the grinding roller 2, the discharge requirements for different fluidities and different finenesses of the finished material can be met, and the situation of reducing the ineffective circulation amount can be reduced.

[0042] Four fixing plates 6 are preferably welded to the outside of the fixed piece 5a. The four fixing plates 6 are radially distributed between the fixed piece 5a and the middle housing 1, and the fixed piece 5a is welded in the middle housing 1 and is located above the basic material retaining ring 13.

[0043] The inner diameter of the fixed piece 5a is larger than the inner diameter of the basic material retaining ring 13, and the outer diameter of the fixed piece 5a is smaller than the outer diameter of the basic material retaining ring 13, so as to facilitate adjusting the distance between the fixed piece 5a and the basic material retaining ring 13. The purpose of such a setting is that the projection of the fixed piece 5a is inside the top surface of the basic material retaining ring 13 to ensure that the maximum gap between them is the vertical gap. If the projection of the fixed piece 5a is outside the basic material retaining ring 13 and there is a dislocation between the two, the vertical gap is not the maximum gap between the two, and the misaligned gap is larger than the vertical gap, resulting in too much material being discharged from the misaligned gap. The height of the bottom surface of the fixed piece 5a from the top surface of the basic material retaining ring 13 is set to 3 - 15 mm. Without rubbing, the distance between the two is as small as possible. The height of the fixed piece 5a is set to 150 - 300 mm. Without interfering with the grinding roller 2, a higher value is selected for the height of the fixed piece 5a.

[0044] In the present invention, after two auxiliary material retaining ring assemblies 5 are welded to the middle housing 1, a guide plate notch 11 is formed between the auxiliary material retaining ring assemblies 5, and the guide plate notch 11 is artificially reserved on the side where the material has been rolled by the grinding roller 2. The rolled material is discharged in time through the guide plate notch 11. The fixed retaining piece 5a is arranged on the side of the grinding roller 2 for feeding and rolling, and the fixed retaining piece 5a blocks all the newly fed material of the feeding pipe 9 and retains it on the rotating grinding disc 8. Also, since a guide plate 5b is welded to the fixed retaining piece 5a, the material inside the fixed retaining piece 5a is guided to the front end of the feeding of the grinding roller 2, and as the rotating grinding disc 8 rotates, the material enters the grinding roller 2 for grinding. In this way, it not only ensures that the ground material is discharged in time, but also ensures that the unground material is guided to the grinding roller 2 for grinding. Through the setting of the structure of the present invention, the ground material is discharged outside the rotating grinding disc 8 in time, and the material guided by the guide plate 5b will not increase the thickness of the material layer for grinding by the grinding roller 2, ensuring the grinding efficiency.

[0045] Further, the number of grinding rollers 2 can be set to two, three or four.

[0046] The design method for reducing the ineffective circulation amount of a mine roller type crusher includes the following steps:

[0047] S1. According to the basic data of the designed hourly output of the crusher and the grindability of the material, determine the grinding disc diameter Dt, the large end diameter Dr1 of the grinding roller, the small end diameter Dr2 of the grinding roller, and the width Br of the grinding roller according to the conventional design method for crusher selection;

[0048] S2. Calculate the diameter φd of the feeding pipe;

[0049] S3. Design and manufacture the basic material retaining ring assembly 7:

[0050] S3.1. Structure design of the basic material retaining ring assembly. The basic material retaining ring assembly 7 includes a basic material retaining ring 13; a circular boss 12 extends upward from the edge of the rotating grinding disc 8, and a notch is provided on the upper end surface of the circular boss 12 for clamping the basic material retaining ring 13, and the basic material retaining ring assembly 7 rotates simultaneously with the rotating grinding disc 8;

[0051] S3.2. Parameter design of the basic material retaining ring assembly;

[0052] S4. Design and manufacture the auxiliary material retaining ring assembly 5 which is arranged above the basic material retaining ring assembly 7 and fixedly connected to the inner wall of the middle housing 1; and a discharge port 10 is formed between the auxiliary material retaining ring assemblies 5;

[0053] S4.1. Design the structure of the auxiliary material retaining ring assembly;

[0054] S4.2. Determine the design parameters of the basic material retaining ring assembly 7 according to the fineness requirement of the finished material.

[0055] Design parameters of the auxiliary material retaining ring assembly 5:

[0056] I. For the case where the raw material particle size is less than 80 mm and the fluidity is good: The first installation dimension L1 of the auxiliary material retaining 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 material guiding angle a formed by the guiding plate 5b and the vertical center line of the rotating grinding disc 8 is designed to be 20 - 25 degrees.

[0057] II. For the case where the raw material particle size is greater than 80 mm and the fluidity is poor: The first installation dimension L1 of the auxiliary material retaining 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 material guiding angle a formed by the guiding plate 5b and the vertical center line of the rotating grinding disc 8 is designed to be 26 - 30 degrees.

[0058] III. For the case where the particle size radius of the ground finished material is 100 microns and the sieve residue is less than 15%: The first installation dimension L1 of the auxiliary material retaining 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 300 - 500 mm, the fourth installation dimension L4 is designed to be 50 - 70 mm, and the material guiding angle a formed by the guiding plate 5b and the vertical center line of the rotating grinding disc 8 is designed to be 20 - 25 degrees.

[0059] IV. For the case where the particle size radius of the ground finished material is 100 microns and the sieve residue is greater than 15%: The first installation dimension L1 of the auxiliary material retaining ring assembly 5 is designed to be 100 - 150 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 material guiding angle a formed by the guiding plate 5b and the vertical center line of the rotating grinding disc 8 is designed to be 26 - 30 degrees.

[0060] The aforementioned first installation dimension L1 is the distance that one end of the fixed retaining piece 5a extends through the horizontal center line of the rotating grinding disc 8, the second installation dimension L2 is the distance from one end of the guiding plate 5b to the longitudinal center line of the rotating grinding disc 8, the third installation dimension L3 is the distance that the other end of the fixed retaining piece 5a extends 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 guiding 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 material retaining ring assembly 5 are selected according to the finished product particle size parameters.

[0061] The design parameters of the basic material retaining ring assembly 7 are as follows:

[0062] The basic stock stop ring assembly 7 includes a basic stock stop ring 13. Through experiments, it is determined that the height of the basic stock stop ring 13 is set to 30 - 60 mm.

[0063] The relative position parameters between the auxiliary stock stop ring assembly 5 and the basic stock stop ring assembly 7:

[0064] The height from the bottom surface of the fixed piece 5a to the top surface of the basic stock stop ring 13 is set to 3 - 15 mm. Without rubbing, the distance between the two should be as small as possible.

[0065] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A design method for reducing the ineffective circulation volume of a roller crusher for mining, characterized in that, It includes the following steps: S1. According to the basic data of the designed hourly output of the grinding mill and the grindability of the material, determine the grinding table diameter Dt, the large end diameter Dr1 of the grinding roller, the small end diameter Dr2 of the grinding roller, and the grinding roller width Br according to the conventional design method for grinding mill selection; S2. Calculate the diameter φd of the feed pipe; S3. Design and manufacture the basic baffle ring assembly (7): S3.

1. Structural design of the basic baffle ring assembly. The basic baffle ring assembly (7) includes a basic baffle ring (13); an annular boss (12) extends upward from the edge of the rotating grinding table (8), and a notch is provided on the upper end surface of the annular boss (12) for clamping the basic baffle ring (13), and the basic baffle ring assembly (7) rotates simultaneously with the rotating grinding table (8); S3.

2. Parameter design of the basic baffle ring assembly; S4. Design and manufacture an auxiliary baffle ring assembly (5) arranged above the basic baffle ring assembly (7) and fixedly connected to the inner wall of the middle housing (1); the number of the auxiliary baffle ring assemblies (5) is the same as the number of the grinding rollers (2), and a discharge port (10) is formed between adjacent auxiliary baffle ring assemblies (5); S4.

1. Design the structure of the auxiliary baffle ring assembly, S4.

2. According to the fineness requirement of the finished material, determine the design parameters of the basic baffle ring assembly (7).

2. The design method for reducing the ineffective circulation amount of a roller crusher for mining according to claim 1, characterized in that: In step S4, the auxiliary baffle ring assembly (5) includes a fixed baffle (5a), the fixed baffle (5a) is a quarter ring, a guiding plate (5b) and a supporting plate (5c) are fixedly connected to the inner side wall of the fixed baffle (5a), one end of the supporting plate (5c) is connected to the fixed baffle (5a), the other end of the supporting plate (5c) is connected to the guiding plate (5b), and the other end of the guiding plate (5b) is connected to the fixed baffle (5a); the supporting plate (5c) is supported between the guiding plate (5b) and the fixed baffle (5a) so that the guiding plate (5b) forms a guiding angle (a) with the vertical center line of the rotating grinding table (8).

3. The design method for reducing the ineffective circulation amount of a roller crusher for mines according to claim 2, characterized in that: For the case where the raw material particle size is less than 80 mm, the fluidity is good, and the material layer after rolling is thin, 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 guiding angle (a) formed by the guiding plate (5b) and the vertical center line of the rotating grinding table (8) is designed to be 20 - 25 degrees.

4. The design method for reducing the ineffective circulation amount of a roller crusher for mines according to claim 2, characterized in that: For the case where the raw material particle size is greater than 80 mm, the fluidity is poor, and the material layer after rolling is thick, 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 guiding angle (a) formed by the guiding plate (5b) and the vertical center line of the rotating grinding table (8) is designed to be 26 - 30 degrees.

5. The design method for reducing the ineffective circulation amount of a roller crusher for mines according to claim 2, characterized in that: For the case where the required fineness of the finished product is relatively fine, that is, the particle size radius of the pulverized finished product is 100 microns and the screen residue is less than 15%: 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 300 - 500 mm, the fourth installation dimension (L4) is designed to be 50 - 70 mm, and the material guiding angle (a) formed between the guiding plate (5b) and the vertical center line of the rotating grinding disc (8) is designed to be 20 - 25 degrees.

6. The design method for reducing the ineffective circulation amount of a roller crusher for mining according to claim 2, characterized in that: For the case where the required fineness of the finished product is relatively coarse, that is, the particle size radius of the pulverized finished product is 100 microns and the screen residue is greater than 15%: 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 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 material guiding angle (a) formed between the guiding plate (5b) and the vertical center line of the rotating grinding disc (8) is designed to be 26 - 30 degrees.

7. The design method for reducing the ineffective circulation volume of a roller crusher for mines according to any one of claims 1 to 6, characterized in that: The height of the basic baffle ring (13) described in step S3.1 is designed to be 30 - 60 mm.

8. The design method for reducing the ineffective circulation amount of a mine roller mill according to claim 7, characterized in that: The distance between the bottom surface of the auxiliary baffle ring assembly (5) and the top surface of the basic baffle ring assembly (7) described in step S4 is set to be 3 - 15 mm.

9. The design method for reducing the ineffective circulation amount of a roller crusher for mines according to claim 2, characterized in that: The height of the fixed baffle (5a) is set to be 150 - 300 mm.

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

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