Design method for reducing over-grinding of materials of mining roller type comminutor

Abstract

The invention discloses a design method for reducing excessive material grinding of a mining roller type comminutor, which belongs to the field of ore crushing and grinding processing, and comprises the following steps of: S1, determining the diameter Dt of a millstone, the diameter Dr1 of a large end of a grinding roller, the diameter Dr2 of a small end of the grinding roller and the width Br of the grinding roller according to the design machine hour of the comminutor and the basic data of the grindability of the material and a conventional design method of model selection of the comminutor; s2, the diameter phi d of the feeding pipe is calculated; s3, designing and manufacturing a basic material retaining ring assembly arranged on the edge of the rotary millstone; S4, designing and manufacturing an auxiliary material retaining ring assembly which is arranged above the basic material retaining ring assembly and is fixedly connected to the inner wall of the middle shell; s5, an adjusting material blocking ring is selectively arranged on the discharging opening; through the dynamic and static combined design of the double-layer retaining ring, the notch is formed in the static retaining ring, materials which are not ground are blocked and conveyed to the grinding roller to be ground, all the ground materials are discharged and sorted, and the problems of repeated grinding and excessive grinding of the materials are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of ore crushing and grinding processing, and particularly relates to a design method for reducing over-grinding of materials in a roller-type ore mill. Background Art

[0002] The treatment of ore requires crushing and grinding the ore according to the requirements of beneficiation equipment. The current main equipment includes crushers, ball mills, and roller-type ore mills. Among them, the roller-type ore mill is widely used due to its large grinding capacity and high efficiency. Since the material bed needs a certain thickness to maintain the stability of grinding, there is a problem of multiple grinding of materials. If the materials are ground multiple times, they will be over-ground, resulting in too fine particle size of the finished materials. On the one hand, it increases the power consumption of grinding. On the other hand, after the grinding is too fine, it is difficult to separate the metal ore or non-metal ore in the ore, reducing the subsequent beneficiation efficiency. Summary of the Invention

[0003] Aiming at the problems existing in the prior art, the present invention provides a design method for reducing over-grinding of materials in a roller-type ore mill.

[0004] The present invention is implemented as follows. A design method for reducing over-grinding of materials in a roller-type ore mill includes 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 material retaining ring assembly:

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

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

[0010] S4. Design and manufacture an auxiliary material retaining ring assembly. The auxiliary material retaining ring assembly is arranged above the basic material retaining ring assembly and is fixedly connected to the inner wall of the middle shell. The number of the auxiliary material retaining ring assemblies is the same as the number of grinding rollers, and they respectively extend from the proximal end of the grinding roller to the distal end of the grinding roller. A discharge port is formed between each auxiliary material retaining ring assembly;

[0011] S4.1. Design the structure of the auxiliary material retaining ring assembly. The auxiliary material retaining ring assembly includes a material retaining piece, and a fixing plate is welded to the outside of the material retaining piece. The number of fixing plates is preferably set to four, and the four fixing plates are radially distributed between the auxiliary material retaining ring assembly and the middle housing, and the auxiliary material retaining ring assembly is welded to the middle housing.

[0012] S4.2. Determine the design parameters of the material retaining piece 14 according to the fineness requirement of the material.

[0013] S5. Optionally, an adjustable material retaining ring is provided at the discharge port.

[0014] Furthermore, for the case where the particle size of the raw material is less than 80 mm, the fluidity is good, and the material layer after rolling is thin, the first installation dimension is designed to be 100 - 150 mm, the second installation dimension is designed to be 300 - 500 mm, and the adjustable material retaining ring is not installed.

[0015] Furthermore, for the case where the particle size of the raw material is greater than 80 mm, the fluidity is poor, and the material layer after rolling is thick, the first installation dimension is designed to be 250 - 300 mm, the second installation dimension is designed to be 200 - 300 mm, the adjustable material retaining ring is installed, and the height of the adjustable material retaining ring is designed to be 130 - 150 mm.

[0016] Furthermore, for the case where the fineness requirement of the finished product material is relatively fine, that is, the radius of the ground finished product particle size is 100 microns and the screen residue is less than 15%, for the case where the fineness requirement of the finished product is relatively fine, the first installation dimension is designed to be 250 - 300 mm, the second installation dimension is designed to be 300 - 500 mm, the adjustable material retaining ring is installed, and the height of the adjustable material retaining ring is designed to be 20 - 40 mm.

[0017] Furthermore, for the case where the fineness requirement of the finished product material is relatively coarse, that is, the radius of the ground finished product particle size is 100 microns and the screen residue is greater than 15%, for the case where the fineness requirement of the finished product is relatively coarse, the first installation dimension is designed to be 100 - 150 mm, the second installation dimension is designed to be 200 - 300 mm, and the adjustable material retaining ring is not installed.

[0018] Furthermore, the number of grinding rollers is selectively set to two, three, or four.

[0019] Advantages and technical effects of the present invention:

[0020] 1. Through the design of the combination of dynamic and static of the double-layer material retaining ring, and at the same time, notches are opened on the static material retaining ring, the unground material is blocked and conveyed to the grinding roller for grinding, and the ground material is all discharged for sorting, reducing the problems of multiple grinding and over-grinding of the material.

[0021] 2. By controlling the position and size of the notch on the material retaining ring, the present invention controls the grinding times of the material and discharges it in a timely manner; moreover, it can meet the grinding requirements of different materials and has a wide adaptability.

[0022] 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

[0023] Figure 1 is the front view of the present invention;

[0024] Figure 2 is the top view of the present invention;

[0025] Figure 3 is the Figure 1 view in the direction of B-B of the present invention;

[0026] Figure 4 is the Figure 1 locally enlarged view at C of the present invention;

[0027] Figure 5 is the partial schematic view of the present invention after installing and adjusting the material retaining ring.

[0028] In the figures: 1. middle housing; 2. grinding roller; 3. rocker arm; 4. grinding roller support; 5. auxiliary material retaining ring assembly; 6. fixing plate; 7. basic material retaining ring assembly; 8. rotating grinding disc; 9. feed pipe; 10. adjusting material retaining ring; 11. discharge port; 12. annular boss; 13. basic material retaining ring; 14. retaining piece; L1. first installation dimension; L2. second installation dimension; L3. height of the adjusting material retaining ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] 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.

[0030] For the traditional material retaining structure of the roller mill, in order to form a stable material layer, a basic material retaining ring assembly 7 integrated with the grinding disc is provided on the outer side of the grinding disc, and the height of the basic material retaining ring assembly 7 is 100 - 200 mm. The material on the rotating grinding disc 8 is blocked by the basic material retaining ring assembly 7. Also, since the upper layer of the material moves fast and the lower layer moves slowly, and the newly fed material is generally in the upper layer, after the material is ground by the grinding roller, the upper layer is thrown out, and the lower layer is blocked by the basic material retaining ring assembly 7 and then enters the next grinding roller to be rolled again, resulting in the material being repeatedly ground and the situation of over-grinding of the material occurring. In order to improve the grinding efficiency, usually an attempt is made to reduce the height of the basic material retaining ring assembly 7. However, after the height of the basic material retaining ring assembly 7 is reduced, the stacking thickness of the material layer is too thin, the mill vibrates greatly, and it cannot operate.

[0031] In view of the above problems, the present invention proposes a design method for reducing the ineffective circulation volume of a roller mill for mining. First, the structure adopted by this method will be introduced. Refer to Figures 1 to 5 , taking two grinding rollers as an example. Since the roller mill involved is a prior art, only the structure related to the present invention is shown in the drawings.

[0032] The roller mill for mining 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. The middle housing 1 wraps the grinding structure in the middle, playing a role of sealing and protection.

[0033] A rotating grinding disc 8 is arranged in the middle housing 1. The rotating grinding disc 8 is driven to rotate by a motor reducer arranged below it. A feed pipe 9 is penetrated and arranged on the side wall of the middle housing 1. The discharge port of the feed pipe 9 is obliquely downward and arranged above the rotating grinding disc 8. The installation position of the feed pipe 9 is perpendicular to the swing 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 a dynamic material bed is formed 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.

[0034] Grinding roller supports 4 are symmetrically arranged outside the middle housing 1. A swing arm 3 is hinged on the grinding roller support 4. The other end of the swing arm 3 is arranged in the middle housing 1, and the other end is fixedly connected to the central rotating shaft of the grinding roller 2. The swing 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.

[0035] A basic material retaining ring assembly 7 is fixedly arranged on 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 to form an annular boss 12. A notch is arranged on the upper end surface of the annular boss 12 for clamping the basic material retaining ring 13, so as to fix the basic material retaining ring 13 on the rotating grinding disc 8, that is, the basic material retaining ring assembly 7 rotates simultaneously with the rotating grinding disc 8; the arrangement of the annular boss 12 enables the basic material retaining ring 13 to bear a large force, which is used to bear the extrusion of the side of the basic material retaining ring 13 when the grinding roller 2 grinds. 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 grinding 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.

[0036] In order to ensure the stability of roller grinding, a second layer of material retaining ring, namely the auxiliary material retaining ring assembly 5, is designed. The auxiliary material retaining ring assembly 5 is arranged above the basic material retaining ring assembly 7; two auxiliary material retaining ring assemblies 5 are provided, and they respectively extend from the proximal end of the roller 2 to the distal end of the roller 2, that is, they extend from the upper feeding side of the roller 2 along the rotation direction of the rotating grinding disc 8 to the discharging side of the roller 2; two discharging ports 11 are formed between the two auxiliary material retaining ring assemblies 5, and the discharging ports 11 facilitate the discharge of the ground material.

[0037] The auxiliary material retaining ring assembly 5 includes a material retaining piece 14, and a fixing plate 6 is welded to the outside of the material retaining piece 14. The number of the fixing plates 6 is preferably set to four, and the four fixing plates 6 are radially distributed between the auxiliary material retaining ring assembly 5 and the middle housing 1, and the auxiliary material retaining ring assembly 5 is welded in the middle housing 1.

[0038] The inner diameter of the material retaining piece 14 is larger than the inner diameter of the basic material retaining ring 13, and the outer diameter of the material retaining piece 14 is smaller than the outer diameter of the basic material retaining ring 13, so as to facilitate adjusting the distance between the auxiliary material retaining ring assembly 5 and the basic material retaining ring assembly 7; the purpose of such setting is to make the projection of the material retaining piece 14 inside the outer ring of the basic material retaining ring 13 to ensure that the maximum gap between them is the vertical gap; if the projection of the material retaining piece 14 is outside the basic material retaining ring 13, there is a dislocation between the two, and the vertical gap is not the maximum gap, and the dislocated gap is larger than the vertical gap, resulting in too much material discharged from the dislocated gap. The height of the bottom surface of the auxiliary material retaining ring assembly 5 from the top surface of the basic material retaining ring assembly 7 is set to 3 - 15 mm, and the distance between the two is as small as possible without rubbing. The height of the material retaining piece 14 is set to 150 - 300 mm, and a higher value is selected for this height without interfering with the roller 2.

[0039] In the present invention, through the two auxiliary material retaining ring assemblies 5 provided, after the two auxiliary material retaining ring assemblies 5 are welded to the middle housing 1, discharging ports 11 can be formed between the auxiliary material retaining ring assemblies 5, and the discharging ports 11 are artificially arranged on the side where the material is rolled by the roller 2. The rolled material is discharged through the discharging ports 11 in time; by adjusting the position and size of the discharging ports 11, the discharge of materials with different fluidities and different finished product fineness requirements can be satisfied. At the same time, according to the grinding situation of the material, an adjusting material retaining ring 10 can be installed on one of the discharging ports 11. The two ends of the adjusting material retaining ring 10 are respectively fixedly connected to the adjacent ends of the two auxiliary material retaining ring assemblies 5 by bolts. By replacing the adjusting material retaining ring 10 with different heights, the height of the discharging port 11 is adjusted to control the discharge efficiency of the material.

[0040] Further, the number of the rollers 2 is selectively set to two, three or four.

[0041] The design method for reducing the ineffective circulation amount of the mine roller crusher includes the following steps:

[0042] S1. Based on the basic data of the designed hourly output of the crusher 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 width Br of the grinding roller according to the conventional design method for crusher selection.

[0043] S2. Calculate the diameter φd of the feed pipe.

[0044] S3. Design and manufacture the basic baffle ring assembly 7:

[0045] 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. A notch is provided on the upper end surface of the annular boss 12 for clamping the basic baffle ring 13. The basic baffle ring assembly 7 rotates simultaneously with the rotating grinding table 8.

[0046] S3.2. Parameter design of the basic baffle ring assembly.

[0047] S4. Design and manufacture the auxiliary baffle ring assembly 5. The auxiliary baffle ring assembly 5 is arranged above the basic baffle ring assembly 7 and is 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 they respectively extend from the proximal end of the grinding roller 2 to the distal end of the grinding roller 2. A discharge port 11 is formed between each of the auxiliary baffle ring assemblies 5.

[0048] S4.1. Design the structure of the auxiliary baffle ring assembly. The auxiliary baffle ring assembly 5 includes a baffle piece 14. A fixing plate 6 is welded to the outside of the baffle piece 14. The number of the fixing plates 6 is preferably set to four. The four fixing plates 6 are radially distributed between the auxiliary baffle ring assembly 5 and the middle housing 1, and the auxiliary baffle ring assembly 5 is welded inside the middle housing 1.

[0049] S4.2. Determine the design parameters of the baffle piece 14 according to the fineness requirements of the finished material.

[0050] S5. Optionally, arrange an adjusting baffle ring 10 on the discharge port 10.

[0051] The design parameters of the baffle piece 14 include: the first installation dimension L1 is the distance that one end of the baffle piece 14 extends through the transverse center line of the rotating grinding table 8, and the second installation dimension L2 is the distance that the other end of the baffle piece 14 extends through the longitudinal center line of the rotating grinding table 8. It should be noted that when there is a conflict between the raw material particle size parameters and the finished product particle size parameters, select the design parameters of the baffle piece 14 according to the finished product particle size parameters, as follows:

[0052] 1. For the case where the raw material particle size is less than 80 mm, with good fluidity and a thin material layer after rolling, the first installation dimension L1 is designed to be 100 - 150 mm, the second installation dimension L2 is designed to be 300 - 500 mm, and the adjusting baffle ring 10 is not installed.

[0053] 2. For the case where the raw material particle size is greater than 80 mm, with poor fluidity and a thick material layer after rolling, the first installation dimension L1 is designed to be 250 - 300 mm, the second installation dimension L2 is designed to be 200 - 300 mm, the adjusting baffle ring 10 is installed, and the height L3 of the adjusting baffle ring is designed to be 130 - 150 mm.

[0054] 3. For the case where a finer fineness of the finished product material is required, that is, the grinding finished product particle size radius is 100 microns and the sieve residue is less than 15%, the first installation dimension L1 is designed to be 250 - 300 mm, the second installation dimension L2 is designed to be 300 - 500 mm, the adjusting baffle ring is installed, and the height L3 of the adjusting baffle ring is designed to be 20 - 40 mm.

[0055] 4. For the case where a coarser fineness of the finished product material is required, that is, the grinding finished product particle size radius is 100 microns and the sieve residue is greater than 15%, the first installation dimension L1 is designed to be 100 - 150 mm, the second installation dimension L2 is designed to be 200 - 300 mm, and the adjusting baffle ring is not installed.

[0056] 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 principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A design method for reducing over-grinding of materials in a roller mill for mining, characterized in that It includes the following steps: S1. According to the basic data of the designed hourly output of the crusher 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 crusher 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 the auxiliary baffle ring assembly (5). The auxiliary baffle ring assembly (5) is arranged above the basic baffle ring assembly (7) and is 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 they extend from the proximal end of the grinding roller (2) to the distal end of the grinding roller (2) respectively, and a discharge port (11) is formed between each of the auxiliary baffle ring assemblies (5); S4.

1. Design the structure of the auxiliary baffle ring assembly. The auxiliary baffle ring assembly (5) includes a baffle piece (14), and a fixing plate (6) is welded to the outside of the baffle piece (14). The number of the fixing plates (6) is preferably set to four, and the four fixing plates (6) are radially distributed between the auxiliary baffle ring assembly (5) and the middle housing (1) to weld the auxiliary baffle ring assembly (5) in the middle housing (1); S4.

2. Determine the design and installation parameters of the baffle piece (14) according to the fineness requirement of the finished material; S5. Optionally, an adjusting baffle ring (10) is provided on the discharge port (11).

2. The design method for reducing over-grinding of materials in a roller mill for mining according to claim 1, characterized in that: In step S4.2, 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) is designed to be 100 - 150 mm, the second installation dimension (L2) is designed to be 300 - 500 mm, and the adjusting baffle ring (10) is not installed.

3. The design method for reducing over-grinding of materials in a roller mill for mining according to claim 1, characterized in that: In step S4.2, 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) is designed to be 250 - 300 mm, the second installation dimension (L2) is designed to be 200 - 300 mm, the adjusting baffle ring (10) is installed, and the height (L3) of the adjusting baffle ring is designed to be 130 - 150 mm.

4. The design method for reducing over-grinding of materials in a roller mill for mining according to claim 1, characterized in that: In step S4.2, for the case where the fineness requirement of the finished product is relatively fine, that is, the radius of the ground finished product particle size is 100 microns and the sieve residue is less than 15%, the first installation dimension (L1) is designed to be 250 - 300 mm, the second installation dimension (L2) is designed to be 300 - 500 mm, the adjusting baffle ring (10) is installed, and the height (L3) of the adjusting baffle ring is designed to be 20 - 40 mm.

5. The design method for reducing over-grinding of materials in a roller mill for mining according to claim 1, characterized in that: In step S4.2, for the case where the fineness requirement of the finished product is relatively coarse, that is, when the particle size radius of the ground finished product is 100 microns and the sieve residue is greater than 15%, the first installation dimension (L1) is designed to be 100 - 150 mm, the second installation dimension (L2) is designed to be 200 - 300 mm, and the adjustment baffle ring is not installed.

6. The design method for reducing the over-grinding of materials in a roller mill for mining according to claim 1, characterized in that: In step S1, the number of grinding rollers (2) is selectively set to two, three or four.

7. The design method for reducing over-grinding of materials in a roller mill for mining according to claim 1, characterized in that: In step S4, the height of the bottom surface of the auxiliary baffle ring assembly (5) from the top surface of the basic baffle ring assembly (7) is preferably 3 - 15 mm.

8. The design method for reducing over-grinding of materials in a roller mill for mining according to claim 1, characterized in that: In step S3.1, the height of the basic baffle ring (13) is designed to be 30 - 60 mm.

9. The design method for reducing over-grinding of materials in a roller mill for mining according to claim 1, characterized in that: In step S4.1, the height of the baffle piece (14) is designed to be 150 - 300 mm.

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