Device for reducing ineffective circulation volume of mining roller type comminutor

Abstract

The utility model discloses a device for reducing ineffective circulation volume of a mining roller type comminutor, which belongs to the field of ore crushing and grinding processing, and comprises a basic retaining ring component fixedly arranged on the edge of a rotary millstone, and the basic retaining ring component and the rotary millstone are relatively static; the auxiliary material retaining ring assembly is fixedly connected to the inner wall of the middle shell and arranged above the basic material retaining ring assembly, and the auxiliary material retaining ring assembly rotates relative to the rotary grinding disc; the two auxiliary material blocking ring assemblies respectively extend to the far end of the rotary millstone along the near end of the grinding roller; a first notch is formed between the two auxiliary material blocking ring assemblies. According to the utility model, the design of dynamic and static combination of the double-layer retaining ring is adopted, and the guide plate is arranged on the fixed retaining ring, so that new materials which are not ground are reguided to the grinding roller for grinding, the discharge of the materials which are not ground is reduced, and the invalid circulation volume of the grinding machine is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to ore crushing and grinding processing technical field, especially relate to a device for reducing invalid circulation amount of mine roller type crushing and grinding machine. BACKGROUND

[0002] The ore processing needs to crush and grind the ore according to the requirement of the ore dressing equipment, and the present main equipment includes crusher, ball mill and roller type crushing and grinding machine. The roller type crushing and grinding machine is widely used because of its material bed grinding, large processing capacity and high efficiency. When grinding, the new feeding is uniformly scattered on the grinding disc by the rotation of the grinding disc relying on the centrifugal force, and then is thrown out from the edge of the grinding disc. Since the edge of the grinding disc is designed with a material blocking ring, the flow speed of the material on the bottom layer of the grinding disc is slow, and the flow speed of the material on the upper layer is fast. The new feeding is generally on the upper layer, and is easily thrown to the edge of the grinding disc, a part of which is directly thrown out, and the other part is accumulated at the root of the material blocking ring and is squeezed out from the gap between the material blocking ring and the grinding roller. This part of the new material directly thrown out without being crushed by the grinding roller, additionally reduces the first yield of the grinding machine, and increases the subsequent screening load, which is an invalid circulation. SUMMARY

[0003] In order to solve the problem that the new material of the existing roller type crushing and grinding machine is thrown out without being ground, resulting in too large circulation amount and too much invalid circulation, and in order to solve the problem that the existing technology sets a high material blocking ring around the rotating grinding disc in order to prevent the new feeding from being thrown out, the new feeding near the material blocking ring is generally on the upper layer, and is easily thrown to the edge of the grinding disc, a part of which is directly thrown out, and the other part is accumulated at the root of the material blocking ring and is squeezed out from the gap between the material blocking ring and the grinding roller. This part of the new material directly thrown out without being crushed by the grinding roller, additionally reduces the first yield of the grinding machine, and increases the subsequent screening load; through the structure of the utility model, the height of the existing material blocking ring is reduced, a fixed material blocking ring is arranged at the corresponding position of the grinding roller, and the problem that the new feeding is directly thrown out to increase the subsequent screening load is prevented.

[0004] The utility model is realized in this way, a device for reducing invalid circulation amount of mine roller type crushing and grinding machine, the mine roller type crushing and grinding machine includes middle casing, is provided with rotating grinding disc in the middle casing, and the rotating grinding disc rotates under the drive of motor;The grinding roller support is symmetrically arranged on the outer side of the middle casing, the rocker arm is hinged on the grinding roller support, the other end of the rocker arm is arranged in the middle casing, and the other end is connected with the grinding roller, and the grinding roller rotates along the rotation shaft thereof;The feed pipe is arranged on the side wall of the middle casing, and the feed pipe discharge port is arranged above the rotating grinding disc, which is used for feeding the new material to the rotating grinding disc;

[0005] The base material blocking ring assembly is fixedly arranged on the rotating grinding disc edge and is relatively static with the rotating grinding disc; the auxiliary material blocking ring assembly is fixedly connected to the inner wall of the middle shell and is arranged above the base material blocking ring assembly, the auxiliary material blocking ring assembly is relatively rotatable with the rotating grinding disc; the auxiliary material blocking ring assembly is arranged in a number corresponding to the grinding roller and extends to the distal end of the rotating grinding disc along the proximal end of the grinding roller; each auxiliary material blocking ring assembly forms a discharge port therebetween, and the discharge port is used for discharging the ground material.

[0006] Further, the auxiliary material blocking ring assembly comprises a fixed baffle, the fixed baffle is a quarter of a circular ring, an inner side wall of the fixed baffle is fixedly connected with a guide plate, and a support plate is connected at one end of the fixed baffle, the support plate is connected at the other end of the guide plate, and the other end of the guide plate is connected with the fixed baffle; the support plate is supported between the guide plate and the fixed baffle, so that the guide plate and the vertical center line of the rotating grinding disc form a material guiding angle.

[0007] Further, the base material blocking ring assembly comprises a base material blocking ring, and the base material blocking ring is fixedly connected to an annular boss arranged upwardly on the edge of the rotating grinding disc.

[0008] Further, the fixed baffle is provided with a fixed plate outside, the fixed plate is provided with a plurality of strips, and the fixed plate connects the fixed baffle to the inner wall of the middle shell.

[0009] Further, the inner diameter of the fixed baffle is greater than the inner diameter of the base material blocking ring, and the outer diameter of the fixed baffle is smaller than the outer diameter of the base material blocking ring, so as to adjust the distance between the fixed baffle and the base material blocking ring.

[0010] Further, the height of the guide plate is consistent with the height of the fixed baffle, and the guide plate is used for guiding the material to the lower side of the grinding roller.

[0011] Further, the guide plate is provided with a guide plate gap on the material discharging side, the guide plate gap cooperates with the grinding roller, and the material overflows to the bottom surface of the grinding roller along the guide plate gap.

[0012] Further, the setting direction of the material guiding angle is opposite to the feeding direction of the grinding roller.

[0013] Further, the angle of the material guiding angle is 20-30 degrees.

[0014] Further, the number of the grinding rollers is two, three or four.

[0015] The utility model has the advantages and technical effects:

[0016] 1. The utility model discloses a double-layer material blocking ring dynamic and static combination design, and the guide plate is arranged on the fixed blocking ring, and the new material that is not ground is guided to the grinding roller to grind, reduces the discharge of the material that is not ground, and reduces the invalid circulation amount of the mill.

[0017] 2. The utility model discloses the groove is seted up in the fixed blocking ring, and the material that grinds is discharged in time, and cooperation fixed blocking ring and guide plate structure make the grinding roller grinding keep reasonable material layer thickness, keep the stability with the high grinding efficiency.

[0018] 3. The utility model discloses simple operation, adjusts fast, is fit for large -area popularization and use. DRAWINGS

[0019] Figure 1 It is the front view of the utility model;

[0020] Figure 2 It is the plan view of the utility model;

[0021] Figure 3 It is the Figure 1 view of B-B of the utility model;

[0022] Figure 4 It is the auxiliary material blocking ring subassembly structure schematic view of the utility model;

[0023] Figure 5 It is the Figure 1 local enlarged view of C of the utility model;

[0024] Figure 6 It is the Figure 4 schematic view of D of the utility model.

[0025] In the drawing: 1, middle shell; 2, grinding roller; 3, swing arm; 4, grinding roller support; 5, auxiliary material blocking ring subassembly; 5a, fixed blocking piece; 5b, guide plate; 5c, support plate; 6, fixed plate; 7, basic material blocking ring subassembly; 8, rotary grinding disc; 9, feed pipe; 10, discharge port; 11, guide plate gap; 12, annular boss; 13, basic material blocking ring; a, material guide angle; L1, first installation size; L2, second installation size; L3, third installation size; L4, fourth installation size. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is combined with example, and the utility model is further detailedly explained.It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0027] The traditional material blocking structure of the roller mill is provided with a base material blocking ring integrated with the mill disc on the outer side of the mill disc to form a stable material layer, and the height of the base material blocking ring is 100-200mm. The material on the rotating mill disc 8 is blocked by the base material blocking ring, and since the upper layer of material moves faster and the lower layer of material moves slower, and the new feeding is generally on the upper layer, it is easy to be thrown to the edge of the rotating mill disc 8, and part of the new feeding is directly thrown out, and the other part is accumulated at the root of the base material blocking ring and is squeezed out from the gap between the base material blocking ring and the rotating mill disc 8. In order to avoid the new feeding from being thrown out, the height of the material blocking ring is usually increased, or a blocking plate is additionally arranged at the front end of the mill roller to block the material which is not ground and is directly thrown out. However, these methods will increase the grinding material layer thickness of the mill roller, reduce the grinding efficiency, increase the power consumption, and cause the invalid circulation of the mill.

[0028] In view of the above problems, the utility model provides a device for reducing the invalid circulation amount of the mine roller mill, and the device is Figures 1 to 6 Taking two mill rollers as an example, since the roller mill involved is the prior art, only the structure of the related part of the utility model is shown in the drawing.

[0029] The mine roller mill comprises a middle shell 1, the middle shell 1 is fixed on a mill roller support 4, the mill roller support 4 is fixed on the ground foundation, the mill roller support 4 wraps the grinding structure in the middle and plays a sealing and protection role.

[0030] A rotating mill disc 8 is arranged in the middle shell 1, the rotating mill disc 8 is driven to rotate by a motor reducer arranged at the lower part of the rotating mill disc 8, a feeding pipe 9 is arranged through the side wall of the middle shell 1, the discharge opening of the feeding pipe 9 is arranged obliquely downward above the rotating mill disc 8, and the arrangement position of the feeding pipe 9 is perpendicular to the rocker arm 3; the material falls on the rotating mill disc 8 through the feeding pipe 9, the material is uniformly scattered due to the continuous rotation of the rotating mill disc 8, a dynamic material bed is formed on the upper surface of the rotating mill disc 8 under the action of the centrifugal force, and finally the material is thrown out of the rotating mill disc 8.

[0031] The mill roller support 4 is symmetrically arranged on the outer side of the middle shell 1, the rocker arm 3 is hingedly connected to the mill roller support 4, the other end of the rocker arm 3 extends into the middle shell 1, and the other end is fixedly connected with the central rotating shaft of the mill roller 2. The rocker arm 3 is obliquely arranged towards the upper surface of the rotating mill disc 8, so that the mill roller 2 is pressed on the rotating mill disc 8, and the mill roller 2 rotates along the central rotating shaft under the driving of the rotating mill disc 8, thereby crushing the material on the rotating mill disc 8 to form a material bed.

[0032] The edge of the rotating grinding disc 8 is fixedly connected with a basic material blocking ring assembly 7, the basic material blocking ring assembly 7 is relatively static with the rotating grinding disc 8, the basic material blocking ring assembly 7 comprises a basic material blocking ring 13; the edge of the rotating grinding disc 8 is provided with an annular boss 12 extending upwards in a circle, the upper end surface of the annular boss 12 is provided with a notch, the notch is used for clamping the basic material blocking ring 13, and then the basic material blocking ring 13 is fixed on the rotating grinding disc 8, that is, the basic material blocking ring 13 rotates with the rotating grinding disc 8 at the same time; the annular boss 12 is arranged to enable the basic material blocking ring 13 to bear a larger stress, and is used for bearing the extrusion of the side edge of the grinding roller 2 on the basic material blocking ring 13 during grinding. The surface of the basic material blocking ring 13 is subjected to mechanical processing, so as to ensure the flatness of the surface and facilitate the discharge of the ground material. According to different types of ores and particle sizes of raw materials, the height of the basic material blocking ring 13 is designed to be 30-60 mm, which is greatly reduced compared with the height of the traditional material blocking ring, and the material is easily discharged.

[0033] In order to ensure the stability of the grinding roller grinding, a second layer of material blocking ring, that is, an auxiliary material blocking ring assembly 5, is designed, the auxiliary material blocking ring assembly 5 is fixedly connected to the inner wall of the middle shell 1, and the auxiliary material blocking ring assembly 5 rotates relative to the rotating grinding disc 8 when the rotating grinding disc 8 rotates; the auxiliary material blocking ring assembly 5 is provided as two, and 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 to the discharging side of the grinding roller 2 along the rotating direction of the rotating grinding disc 8; two discharge ports 10 are formed between the two auxiliary material blocking ring assemblies 5, and the discharge ports 10 facilitate the discharge of the ground material.

[0034] The auxiliary material blocking ring assembly 5 comprises a fixed baffle 5a, the fixed baffle 5a is a quarter of a circular ring, the side wall of the fixed baffle 5a is welded with a guide plate 5b and a support plate 5c; the guide plate 5b is arranged at the front of the feeding end of the grinding roller 2, the height of the guide plate 5b is consistent with the height of the fixed baffle 5a, and the material is conveniently guided to the lower side of the grinding roller 2; the discharging side of the guide plate 5b is provided with a guide plate gap 11, and the guide plate gap 11 is matched with the grinding roller 2 to facilitate the overflow of the material along the guide plate 5b to the lower side of the grinding roller 2.

[0035] One end of the support plate 5c is welded with the fixed baffle 5a, the other end of the support plate 5c is welded with the guide plate 5b, and the other end of the guide plate 5b is welded with 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 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 discharge port 10, the material guiding angle a of the guide plate 5b and the distance between the guide plate 5b and the grinding roller 2, the discharge of different fluidity and different finished product material fineness requirements can be met, and the invalid circulation amount is reduced.

[0036] The fixed baffle 5a is welded with a fixed plate 6, preferably four fixed plates 6 are arranged radially between the fixed baffle 5a and the middle shell 1, the fixed baffle 5a is welded in the middle shell 1 and is located above the base baffle ring 13.

[0037] The inner diameter of the fixed baffle 5a is larger than the inner diameter of the base baffle ring 13, and the outer diameter of the fixed baffle 5a is smaller than the outer diameter of the base baffle ring 13, so as to adjust the distance between the fixed baffle 5a and the base baffle ring 13; the purpose of the arrangement is that the fixed baffle 5a is projected inside the top surface of the base baffle ring 13, so as to ensure that the maximum gap between them is the vertical gap; if the fixed baffle 5a is projected outside the base baffle ring 13, there is a misalignment between the two, the vertical gap is not the maximum gap, the misalignment gap is larger than the vertical gap, and too much material is discharged from the misalignment gap. The height of the bottom surface of the fixed baffle 5a from the top surface of the base baffle ring 13 is 3-15mm, and the distance between the two is as small as possible without scratching. The height of the fixed baffle 5a is preferably 150-300mm, and the height of the fixed baffle 5a is selected to be higher without interfering with the grinding roller 2.

[0038] The two auxiliary baffle ring assemblies 5 are welded with the middle shell 1, and the guide plate gap 11 can be formed between the two auxiliary baffle ring assemblies 5, and the guide plate gap 11 is artificially reserved on one side of the material after being crushed by the grinding roller 2. The crushed material is discharged in time through the guide plate gap 11; the fixed baffle 5a is arranged on one side of the grinding roller 2 for crushing the material, and the fixed baffle 5a blocks all the material fed by the feeding pipe 9 and remains on the rotating grinding disc 8; and since the guide plate 5b is welded on the fixed baffle 5a, the material inside the fixed baffle 5a is guided to the front end of the grinding roller 2 for feeding, and the material enters the grinding roller 2 for grinding along with the rotation of the rotating grinding disc 8. In this way, it is ensured that the ground material is discharged in time, and the unground material is guided to the grinding roller 2 for grinding. Through the arrangement of the structure of the utility model, the ground material is discharged to the outside of the rotating grinding disc 8 in time, and the material guided by the guide plate 5b does not increase the thickness of the material layer of the grinding roller 2, and the grinding efficiency is ensured.

[0039] Further, the number of grinding rollers 2 can be two, three or four.

[0040] The design principle of the utility model is described as follows: taking a mill with a grinding disc diameter of 2400 mm as an example, the raw ore feeding particle size is 80 mm, the material layer thickness after being ground by the grinding roller is about 60 mm, the finished product fineness requirement is relatively coarse, and the R100 micron sieve residue is more than 20%. It can be seen that the new material flowability is poor, and it is necessary to ensure that the ground material is discharged in time. In view of the foregoing grinding requirements, the installation parameter settings of the auxiliary material blocking ring assembly 5 are as follows: the fixed blocking piece 5a height is designed to be 60 mm, the first installation size L1 is designed to be 300 mm, the second installation size L2 is designed to be 1500 mm, the third installation size L3 is designed to be 300 mm, the fourth installation size L4 is designed to be 100 mm, and the material guide angle a is designed to be 28 degrees. A part of the new feeding of the feeding pipe 9 first enters the grinding roller for grinding, and then is discharged in time by the guide plate gap 11, and the other part is blocked by the fixed blocking piece 5a, and then enters the grinding roller 2 again under the guidance of the guide plate 5b for grinding under the rotation of the rotating grinding disc 8, and then is discharged from the guide plate gap 11. The discharged material is all ground by the grinding roller, reducing the discharge amount of unground material, achieving the purpose of reducing the invalid circulation amount. Through testing, the above installation parameters can meet the foregoing material grinding discharge requirements.

[0041] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A device for reducing the invalid circulation amount of a mining roller mill, the mining roller mill comprising a middle shell (1), a rotating grinding disc (8) being arranged in the middle shell (1), and the rotating grinding disc (8) being rotated by the drive of a motor; a grinding roller support (4) being symmetrically arranged on the outer side of the middle shell (1), a rocker arm (3) being hinged on the grinding roller support (4), the other end of the rocker arm (3) being arranged in the middle shell (1), and the other end being connected to a grinding roller (2), and the grinding roller (2) rotating along its own rotation axis; a feed pipe (9) being arranged through the side wall of the middle shell (1), the discharge port of the feed pipe (9) being arranged above the rotating grinding disc (8), and being used for feeding new material onto the rotating grinding disc (8); Its characteristics are: A basic retaining ring assembly (7) is fixedly arranged on the edge of the rotating grinding disc (8), and the basic retaining ring assembly (7) and the rotating grinding disc (8) are relatively stationary; it also includes an auxiliary retaining ring assembly (5) fixedly connected to the inner wall of the middle shell (1), and the auxiliary retaining ring assembly (5) is arranged above the basic retaining ring assembly (7), and the auxiliary retaining ring assembly (5) and the rotating grinding disc (8) rotate relatively; the number of the auxiliary retaining ring assemblies (5) corresponds to the grinding roller (2), and they extend from the proximal end of the grinding roller (2) to the distal end of the rotating grinding disc (8), that is, from the upper 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); a discharge port (10) is formed between each of the auxiliary retaining ring assemblies (5), and the discharge port (10) is used to discharge the material after grinding.

2. The device for reducing the ineffective circulation of a mining roller mill according to claim 1, characterized in that: The auxiliary material retaining ring assembly (5) comprises a fixed retaining plate (5a), the fixed retaining plate (5a) being a quarter-circular ring, the inner side wall of the fixed retaining plate (5a) being fixedly connected with a guide plate (5b), and a support plate (5c), one end of the support plate (5c) being connected to the fixed retaining plate (5a), the other end of the support plate (5c) being connected to the guide plate (5b), and the other end of the guide plate (5b) being connected to the fixed retaining plate (5a); the support plate (5c) being supported between the guide plate (5b) and the fixed retaining plate (5a), so that the guide plate (5b) forms a material guide angle (a) with the vertical center line of the rotating grinding disc (8).

3. The device for reducing the ineffective circulation of a mining roller mill according to claim 2, characterized in that: The basic retaining ring assembly (7) comprises a basic retaining ring (13), and the basic retaining ring (13) is fixedly connected to an annular boss (12) extending upward from the edge of the rotating grinding disc (8).

4. The device for reducing the ineffective circulation of a mining roller mill according to claim 3, characterized in that: A fixing plate (6) is provided on the outside of the fixing baffle (5a), and the fixing plate (6) is provided with a plurality of strips. The fixing plate (6) connects the fixing baffle (5a) to the inner wall of the middle shell (1).

5. The device for reducing the ineffective circulation of a mining roller mill according to claim 4, characterized in that: The inner diameter of the fixed baffle (5a) is larger than the inner diameter of the basic baffle ring (13), and the outer diameter of the fixed baffle (5a) is smaller than the outer diameter of the basic baffle ring (13), so as to adjust the distance between the fixed baffle (5a) and the basic baffle ring (13).

6. The device for reducing the ineffective circulation of a mining roller mill according to claim 5, characterized in that: The guide plate (5b) has a height consistent with that of the fixed baffle (5a), and is used to guide the material to the lower side of the grinding roller (2).

7. The device for reducing the ineffective circulation of a mining roller mill according to claim 6, characterized in that: A guide plate notch (11) is provided on the discharge side of the guide plate (5b), and the guide plate notch (11) cooperates with the grinding roller (2) to allow the material to overflow along the guide plate notch (11) to the bottom surface of the grinding roller (2).

8. The device for reducing the ineffective circulation of a mining roller mill according to claim 7, characterized in that: The setting direction of the material guide angle (a) is opposite to the feeding direction of the grinding roller (2).

9. The device for reducing the ineffective circulation of a mining roller mill according to claim 2, characterized in that: The material guiding angle (a) is 20 to 30 degrees.

10. The device for reducing the ineffective circulation of a mining roller mill according to claim 1, characterized in that: The number of grinding rollers (2) is two, three or four.

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