A pair of rolls

Abstract

The utility model relates to petroleum chemical industry technical field especially relates to a pair of roll crusher, it includes frame, roll and drive mechanism, the roll is provided with two, and two roll opposite settings, the roll includes roll axle, roll skin and crushing tooth, the roll axle rotatable setting on the frame, the roll skin sets up on the roll axle, crushing tooth sets up roll skin's surface, crushing tooth includes with roll skin connects tooth bottom and sets up tooth tip portion in tooth bottom top surface, along the radial outward, tooth bottom with tooth tip portion all are size taper structure, and the reduction degree of tooth tip portion is greater than the reduction degree of tooth bottom, drive mechanism with roll connection is used for driving two roll opposite rotation, compared with the prior art, the pair of roll crusher that the utility model provides can better avoid the phenomenon of over crushing, improve the proportion of the required granularity petroleum coke output.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical technology, and in particular to a double roll crusher. Background Technology

[0002] Petroleum coke is a solid carbonaceous product obtained by subjecting the heavy residue oil left after crude oil is distilled and separated into light and heavy oil products to deep thermal cracking and condensation reactions at high temperatures. Petroleum coke has a variety of uses, such as as an electrode, metallurgical material, and fuel.

[0003] During the production process, when the original particle size of petroleum coke cannot meet the requirements of downstream production processes or product specifications, crushing and screening are necessary. Currently, the conventional method is to crush petroleum coke using a double-roll crusher. When crushing petroleum coke, the particle size needs to be controlled within a certain range; the particle size of the crushed petroleum coke cannot be too small or too large. However, the proportion of petroleum coke of the required particle size produced by conventional double-roll crushers is still relatively low. For example, existing double-roll crushers are prone to over-crushing when crushing petroleum coke (resulting in a high proportion of powder after crushing).

[0004] Therefore, how to provide a new type of double-roll crusher to better meet the crushing requirements of petroleum coke and to more stably produce petroleum coke of the required particle size is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] To address the problem that existing double-roll crushers produce a low proportion of petroleum coke of the desired particle size, this invention provides a double-roll crusher that, through improvements to the structure of the crushing teeth, better meets the crushing requirements of petroleum coke, increases the proportion of petroleum coke produced at the desired particle size, and enables more stable production of petroleum coke of the required particle size.

[0006] A double roll crusher includes a frame, rolls and a drive mechanism; The rollers are provided in two parts, and the two rollers are arranged opposite to each other; The roller includes a roller shaft, a roller skin, and crushing teeth. The roller shaft is rotatably mounted on the frame. The roller skin is mounted on the roller shaft. The crushing teeth are mounted on the surface of the roller skin. Each crushing tooth includes a tooth base connected to the roller skin and a tooth tip mounted on the top surface of the tooth base. The tooth base and the tooth tip are both radially outward. Both the tooth base and the tooth tip have a tapered structure, and the tapering degree of the tooth tip is greater than that of the tooth base. The drive mechanism is connected to the rollers and is used to drive the two rollers to rotate in opposite directions.

[0007] Preferably, the bottom of the tooth is a truncated quadrangular structure, and the tip of the tooth is a pyramidal structure.

[0008] Preferably, the tooth base is a truncated quadrangular pyramid structure, the tooth tip is a truncated quadrangular pyramid structure, and the tooth base and the tooth tip are skewed to the same side in the circumferential direction.

[0009] Preferably, the height of the crushing tooth is 75mm, and the height of the tooth bottom is 63mm; The bottom surface length of the tooth is 75mm, and the top surface length of the tooth is 25mm; The bottom surface width of the tooth is 35mm, and the top surface width of the tooth is 30mm.

[0010] Preferably, the roller skin is provided with a first set of crushing teeth and a second set of crushing teeth, and the first set of crushing teeth and the second set of crushing teeth respectively include a plurality of crushing teeth; Multiple sets of the first and second crushing tooth groups are provided, and the first and second crushing tooth groups are sequentially distributed on the roller skin along the axial direction.

[0011] Preferably, in the axial direction, the centers of each of the first set of crushing teeth in the same group coincide; In the axial direction, the centers of the crushing teeth in the same group of the second crushing teeth coincide.

[0012] Preferably, the crushing teeth in the same first crushing tooth group are distributed evenly and sequentially along the circumference, and the roller skin is covered along the circumference. Each of the crushing teeth in the same second crushing tooth group is distributed evenly and sequentially along the circumferential direction, and the roller skin is covered along the circumferential direction; In the circumferential direction, the crushing teeth in each of the first crushing tooth groups are arranged facing each other; In the circumferential direction, the crushing teeth in each group of the second crushing tooth group are arranged facing each other; In the circumferential direction, the breaking teeth in the second breaking tooth group are misaligned with the breaking teeth in the first breaking tooth group.

[0013] Preferably, the first set of crushing teeth is provided with 9 sets, and the second set of crushing teeth is provided with 8 sets; Along the axial direction, the first set of crushing teeth is arranged at intervals, and a set of second crushing teeth is arranged between every two adjacent sets of the first set of crushing teeth.

[0014] Preferably, the axial distance between the outermost first crushing tooth group and the edge of the roller skin is 50 mm; The axial distance between adjacent first and second crushing tooth groups is 87.5 mm.

[0015] Preferably, the two rollers have the same structure.

[0016] Compared with the prior art, the double-roll crusher provided by this utility model includes a frame, rollers, and a drive mechanism; two rollers are provided, and the two rollers are arranged opposite to each other; each roller includes a roller shaft, a roller skin, and crushing teeth, the roller shaft is rotatably mounted on the frame, the roller skin is mounted on the roller shaft, and the crushing teeth are mounted on the surface of the roller skin. Each crushing tooth includes a tooth base connected to the roller skin and a tooth tip disposed on the top surface of the tooth base, extending radially outward. Both the tooth base and the tooth tip have a tapered structure, and the tapering degree of the tooth tip is greater than that of the tooth base; the drive mechanism is connected to the rollers and is used to drive the two rollers to rotate in opposite directions. The crushing teeth in the roller crusher include a tooth base and a tooth tip with gradually decreasing dimensions, and the reduction degree of the tooth tip is greater than that of the tooth base. As a result, the surface of the tooth tip can be smoother, which can better avoid over-crushing when crushing petroleum coke. This better meets the crushing requirements of petroleum coke, increases the proportion of petroleum coke produced in the required particle size, and can produce petroleum coke of the required particle size more stably. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A top view of a double roll crusher provided in one embodiment; Figure 2 A top view of a roller provided in one embodiment; Figure 3 for Figure 2 Side view of the roller shown; Figure 4 for Figure 2 A cross-sectional view of line AA shown; Figure 5 A three-dimensional structural schematic diagram of a breaking tooth provided in one embodiment; Figure 6 for Figure 5 The front view of the breaking tooth shown; Figure 7 for Figure 5 Side view of the breaking tooth shown; Figure 8 for Figure 5 A top view of the breaking teeth shown; Explanation of reference numerals in the attached figures: The components include a double roll crusher 100, a frame 10, a feed inlet 11, a roll 20, a roll shaft 21, a roll skin 22, crushing teeth 23, a tooth bottom 231, a tooth bottom top surface 2311, a tooth bottom side surface 2312, a first circumferential side surface 23121, a first axial side surface 23122, a second circumferential side surface 23123, a second axial side surface 23124, a tooth bottom bottom surface 2313, a tooth tip 232, a tooth tip side surface 2321, a first crushing tooth group 2301, a second crushing tooth group 2302, a drive mechanism 30, a motor 31, a gearbox 32, and a coupling 33. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that when a component is referred to as "mounted on", "fixed on", or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0021] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0022] This utility model provides a double-roll crusher, which includes a frame, rollers, and a drive mechanism. Two rollers are provided, and the two rollers are arranged opposite each other. Each roller includes a roller shaft, a roller skin, and crushing teeth. The roller shaft is rotatably mounted on the frame, the roller skin is mounted on the roller shaft, and the crushing teeth are disposed on the surface of the roller skin. Each crushing tooth includes a tooth base connected to the roller skin and a tooth tip disposed on the top surface of the tooth base. Both the tooth base and the tooth tip have a tapered structure, and the tapering degree of the tooth tip is greater than that of the tooth base. The drive mechanism is connected to the rollers and is used to drive the two rollers to rotate in opposite directions. The crushing teeth in the roller crusher include a tooth base and a tooth tip with gradually decreasing dimensions, and the reduction degree of the tooth tip is greater than that of the tooth base. As a result, the surface of the tooth tip can be smoother, which can better avoid over-crushing when crushing petroleum coke. This better meets the crushing requirements of petroleum coke, increases the proportion of petroleum coke produced in the required particle size, and can produce petroleum coke of the required particle size more stably.

[0023] Please refer to the following: Figures 1 to 8 In one embodiment, a double-roll crusher 100 is provided, which is mainly used for crushing petroleum coke and is a double-roll crushing device for petroleum coke. The double-roll crusher 100 is mainly used to solve the problem that the proportion of petroleum coke of the required particle size produced by the existing double-roll crusher is relatively low when crushing petroleum coke.

[0024] The double-roll crusher 100 includes a frame 10, rollers 20, and a drive mechanism 30. Two rollers 20 are provided and arranged opposite to each other. Each roller 20 includes a roller shaft 21, a roller skin 22, and crushing teeth 23. The roller shaft 20 is rotatably mounted on the frame 10. The roller skin 22 is mounted on the roller shaft 21. The crushing teeth 23 are disposed on the surface of the roller skin 22. Each crushing tooth 23 includes a tooth base 231 connected to the roller skin 22 and a tooth tip 232 disposed on the top surface 2311 of the tooth base 231. Radially outward, both the tooth base 231 and the tooth tip 232 have a tapered shape, with the tapering degree of the tooth tip 232 being greater than that of the tooth base 231. In other words, the dimension of the tooth base 231 near the roller skin 22 is larger than the dimension of the tooth base 231 away from the roller skin 22, and the dimension of the tooth tip 232 near the tooth base 231 is larger than the dimension of the tooth tip 232 away from the tooth base 231. Furthermore, both the tooth base 231 and the tooth tip 232 have a gradually decreasing size structure, resulting in a gradually sharpening overall structure of the crushing tooth 23. Simultaneously, compared to the tooth base 231, the reduction in size of the tooth tip 232 is greater and more pronounced. For example, as... Figure 6 and Figure 7 As shown, the side surface 2312 of the tooth bottom 231 and the side surface 2321 of the tooth tip 232 are both inclined surfaces that slope inward, and at least some of the side surfaces 2321 of the tooth tip 232 slope inward at a greater angle.

[0025] The drive mechanism 30 is connected to the roller 20 and is used to drive the two rollers 20 to rotate in opposite directions.

[0026] When the double roll crusher 100 is in use, petroleum coke is fed into the frame 10 from the feed port 11 at the top of the frame 10, and then crushed by the two rollers 20. The crushed petroleum coke then flows out from the discharge port at the bottom of the frame 10.

[0027] It is understandable that existing double roll crushers produce a relatively low proportion of petroleum coke of the required particle size after crushing, for example, double roll crushers are prone to over-crushing.

[0028] The structure of the crushing teeth in the double-roll crusher 100 provided in this embodiment has been improved. The crushing teeth 23 are designed as two parts: the bottom 231 and the tip 232. The size of the tip 232 is reduced to a greater extent, so at least some of the side surfaces 2321 of the tip 232 are more gentle. During crushing, the side surfaces 2321 of the tip 232 can better accommodate petroleum coke, which can not only meet the crushing requirements of petroleum coke, but also better avoid over-grinding when crushing petroleum coke. This can increase the proportion of petroleum coke produced in the required particle size and produce petroleum coke of the required particle size more stably.

[0029] In this application, radial, axial, and circumferential directions are all referenced as a whole to the radial, axial, and circumferential directions of the roller 20.

[0030] Preferably, in one embodiment, the tooth base 231 is a frustum structure, meaning the overall shape of the tooth base 231 is a frustum. To ensure more reliable engagement between the tooth base 231 and the roller skin 22, the bottom surface 2313 of the tooth base is an arc surface that matches the roller skin 22. The tooth tip 232 is a pyramid structure, meaning the overall shape of the tooth tip 232 is a pyramid. This structural design is more conducive to the crushing of petroleum coke.

[0031] Preferably, in one embodiment, the tooth base 231 is an oblique quadrangular frustum structure, that is, the tooth base 231 is not a regular quadrangular frustum structure, but an eccentric quadrangular frustum structure, and the center of the top surface 2311 of the tooth base is not in the same position area as the center of the bottom surface 2313 of the tooth base. The tooth tip 232 is an oblique quadrangular pyramid structure, that is, the tooth tip 232 is not a regular quadrangular pyramid structure, and the tip of the tooth tip 232 is biased to one side. The tooth base 231 and the tooth tip 232 are biased to the same side circumferentially, that is, the tooth base 231 and the tooth tip 232 are biased to the same side. For example, as Figure 6 As shown, both the tooth base 231 and the tooth tip 232 are tilted to the right. This structural design allows for better adaptation to the material flow direction in the double-roll crusher 100, improving the crushing effect. Furthermore, this structure enables both "cutting" and "shredding" when crushing petroleum coke, thus more effectively crushing petroleum coke to the required particle size.

[0032] Specifically, in one embodiment, the height of the breaking tooth 23 is H1, specifically 75mm, and the height of the tooth base is H2, specifically 63mm. Here, the height is the dimension obtained by drawing a perpendicular line from the tip of the tooth tip 232 to the bottom surface 2313 of the tooth base. The length of the bottom surface 2313 is L1, specifically 75mm, and the length of the top surface 2311 is L2, specifically 25mm. The width of the bottom surface 2313 is W1, specifically 35mm, and the width of the top surface 2311 is W2, specifically 30mm.

[0033] More specifically, in one embodiment, the tooth bottom side surface 2312 includes a first circumferential side surface 23121, a first axial side surface 23122, a second circumferential side surface 23123, and a second axial side surface 23124. The straight-line distance between the bottom of the first circumferential side surface 23121 and the center line (a perpendicular line drawn from the tip of the tooth tip 232 as the origin to the bottom surface 2313 of the tooth bottom) is L3, specifically 25 mm. The straight-line distance between the top of the second circumferential side surface 23123 and the center line is L4, specifically 21 mm. In one embodiment, the inclination angles of the first axial side surface 23122 and the second axial side surface 23124 are both 4.42°.

[0034] In one embodiment, the four edges of the tooth bottom 231 all adopt a gradually rounded transition structure. Specifically, from the bottom surface 2313 of the tooth bottom to the top surface 2311 of the tooth bottom, the radius of the rounded arc at the four edges ranges from R8 to 0. That is, the four end angles of the top surface 2311 of the tooth bottom are basically right angles, while the four end angles of the bottom surface 2313 of the tooth bottom are all rounded arcs.

[0035] Preferably, in one embodiment, the roller skin 22 is provided with a first crushing tooth group 2301 and a second crushing tooth group 2302, each of which includes a plurality of crushing teeth 23. Multiple groups of the first crushing tooth group 2301 and the second crushing tooth group 2302 are provided, and are sequentially distributed along the axial direction on the roller skin 22. That is, in this embodiment, the plurality of crushing teeth 23 on the roller skin 22 are orderly distributed, and can be divided into the first crushing tooth group 2301 and the second crushing tooth group 2302 according to their distribution position. Each group of crushing tooth groups is then sequentially distributed along the axial direction, thereby improving the uniformity of crushing and increasing the crushing efficiency when crushing petroleum coke.

[0036] Preferably, in one embodiment, the centers of the crushing teeth 23 in the same group of first crushing tooth sets 2301 coincide in the axial direction; similarly, the centers of the crushing teeth 23 in the same group of second crushing tooth sets 2302 coincide in the axial direction. That is, the crushing teeth 23 in the same group of first crushing tooth sets 2301 are disposed in the same axial region, rather than being obliquely disposed. Likewise, the crushing teeth 23 in the same group of second crushing tooth sets 2302 are disposed in the same axial region, rather than being obliquely disposed.

[0037] Preferably, in one embodiment, the crushing teeth 23 in the same group of first crushing tooth sets 2301 are evenly spaced along the circumference and cover the roller skin 22 circumferentially. Similarly, the crushing teeth 23 in the same group of second crushing tooth sets 2302 are evenly spaced along the circumference and cover the roller skin 22 circumferentially. In the circumferential direction, the crushing teeth 23 in each group of first crushing tooth sets 2301 are directly opposite each other, meaning they completely overlap circumferentially. Likewise, the crushing teeth 23 in each group of second crushing tooth sets 2302 are also completely overlap circumferentially. In the circumferential direction, the crushing teeth 23 in the second crushing tooth group 2302 are misaligned with the crushing teeth 23 in the first crushing tooth group 2301. That is, the crushing teeth 23 in the first crushing tooth group 2301 and the crushing teeth 23 in the second crushing tooth group 2302 are misaligned not only axially but also circumferentially. This structural design further improves the uniformity of crushing and increases the yield of petroleum coke of the desired particle size.

[0038] Specifically, in one embodiment, each first set of crushing teeth 2301 is provided with 22 crushing teeth 23, and each second set of crushing teeth 2302 is provided with 22 crushing teeth 23.

[0039] Specifically, in one embodiment, along the circumferential direction, the central angle between two adjacent breaking teeth 23 in the first breaking tooth group 2301 is α1, specifically 16.36°.

[0040] Specifically, in one embodiment, along the circumferential direction, a second crushing tooth 23 of the second crushing tooth group 2302 is provided between every two adjacent crushing teeth 23 in the first crushing tooth group 2301, and the central angle between the crushing tooth 23 in the first crushing tooth group 2301 and the adjacent crushing tooth 23 in the second crushing tooth group 2302 is α2, specifically 8.18°.

[0041] Specifically, in one embodiment, the diameter of the tip circle formed by the tip of the breaking tooth 23 is d1, specifically 1470 mm, and the diameter of the root circle formed by the root of the breaking tooth 23 is d2, specifically 1320 mm.

[0042] Specifically, in one embodiment, the spacing between the two rollers 21 (the distance between the central axes of the two rollers 21) is 1480 mm.

[0043] Preferably, in one embodiment, nine sets of the first crushing tooth group 2301 and eight sets of the second crushing tooth group 2302 are provided. Along the axial direction, the first crushing tooth groups 2301 are arranged at intervals, with a set of second crushing tooth groups 2302 positioned between every two adjacent sets of the first crushing tooth groups 2301. That is, the first crushing tooth groups 2301 and the second crushing tooth groups 2302 are distributed alternately along the axial direction, thereby further improving the uniformity of crushing in each region.

[0044] Specifically, in one embodiment, the outermost first crushing tooth group 2301 is axially 50 mm from the edge of the roller skin 22. This distance refers to the axial distance between the centerline of the first crushing tooth group 2301 and the edge of the roller skin 22. The axial distance between adjacent first crushing tooth groups 2301 and second crushing tooth groups 2302 is 87.5 mm. This distance refers to the axial distance between the centerlines of the first crushing tooth group 2301 and the second crushing tooth group 2302.

[0045] More specifically, in one embodiment, the axial length of the roller skin 22 is 1500 mm, and the axial distance between the two outermost first crushing tooth groups 2301 is 1400 mm.

[0046] Preferably, in one embodiment, the two rollers 20 have the same structure, and the crushing teeth 23 on the two rollers 20 are arranged in a one-to-one correspondence.

[0047] Specifically, in one embodiment, two drive mechanisms 30 are provided, and the two drive mechanisms 30 are correspondingly connected to the roller shafts 21 of the two rollers 20.

[0048] More specifically, in one embodiment, the drive mechanism 30 includes a motor 31, a reduction gearbox 32, and a coupling 33. The input end of the reduction gearbox 32 is connected to the output shaft of the motor 31, the output end of the reduction gearbox 32 is connected to the coupling 33, and the coupling 33 is connected to the roller shaft 21.

[0049] By improving the structure and arrangement of the crushing teeth 23, the double roll crusher 100 can better avoid over-crushing when crushing petroleum coke, and can increase the output ratio of petroleum coke with the required particle size. Specifically, after testing, the proportion of petroleum coke with a particle size between 30mm and 100mm produced by the double roll crusher 100 can reach about 80%.

[0050] The above description is merely an embodiment of this utility model. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this utility model, but these improvements all fall within the protection scope of this utility model.

Claims

1. A double-roll crusher, characterized in that, Includes the frame, rollers, and drive mechanism; The rollers are provided in two parts, and the two rollers are arranged opposite to each other; The roller includes a roller shaft, a roller skin, and crushing teeth. The roller shaft is rotatably mounted on the frame. The roller skin is mounted on the roller shaft. The crushing teeth are mounted on the surface of the roller skin. Each crushing tooth includes a tooth base connected to the roller skin and a tooth tip mounted on the top surface of the tooth base. The tooth base and the tooth tip are both radially outward. Both the tooth base and the tooth tip have a tapered structure, and the tapering degree of the tooth tip is greater than that of the tooth base. The drive mechanism is connected to the rollers and is used to drive the two rollers to rotate in opposite directions.

2. The double-roll crusher according to claim 1, characterized in that, The bottom of the tooth has a truncated quadrangular structure, and the tip of the tooth has a pyramidal structure.

3. The double-roll crusher according to claim 2, characterized in that, The tooth base is a truncated quadrangular pyramid structure, and the tooth tip is a truncated quadrangular pyramid structure, with the tooth base and the tooth tip skewed to the same side in the circumferential direction.

4. The double-roll crusher according to claim 3, characterized in that, The height of the crushing tooth is 75mm, and the height of the tooth bottom is 63mm; The bottom surface length of the tooth is 75mm, and the top surface length of the tooth is 25mm; The bottom surface width of the tooth is 35mm, and the top surface width of the tooth is 30mm.

5. The double-roll crusher according to claim 1, characterized in that, The roller skin is provided with a first set of crushing teeth and a second set of crushing teeth, and the first set of crushing teeth and the second set of crushing teeth each include a plurality of crushing teeth; Multiple sets of the first and second crushing tooth groups are provided, and the first and second crushing tooth groups are sequentially distributed on the roller skin along the axial direction.

6. The double-roll crusher according to claim 5, characterized in that, In the axial direction, the centers of the crushing teeth in the same first set of crushing teeth coincide; In the axial direction, the centers of the crushing teeth in the same group of the second crushing teeth coincide.

7. The double-roll crusher according to claim 6, characterized in that, The crushing teeth in the first crushing tooth group of the same group are distributed evenly and sequentially along the circumference, and are covered with the roller skin along the circumference; Each of the crushing teeth in the same second crushing tooth group is distributed evenly and sequentially along the circumferential direction, and the roller skin is covered along the circumferential direction; In the circumferential direction, the crushing teeth in each of the first crushing tooth groups are arranged facing each other; In the circumferential direction, the crushing teeth in each group of the second crushing tooth group are arranged facing each other; In the circumferential direction, the breaking teeth in the second breaking tooth group are misaligned with the breaking teeth in the first breaking tooth group.

8. The double-roll crusher according to claim 7, characterized in that, The first set of crushing teeth has 9 sets, and the second set of crushing teeth has 8 sets; Along the axial direction, the first set of crushing teeth is arranged at intervals, and a set of second crushing teeth is arranged between every two adjacent sets of the first set of crushing teeth.

9. The double-roll crusher according to claim 8, characterized in that, The outermost first crushing tooth group is 50mm away from the edge of the roller skin; The axial distance between adjacent first and second crushing tooth groups is 87.5 mm.

10. The double-roll crusher according to any one of claims 1 to 9, characterized in that, The two rollers have the same structure.

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