Roller of double-roller machine

Through the improved roller-mounted roller structure, the individual replacement and stable installation of the contact cylinder ring are achieved, which solves the problems of high maintenance costs and unstable material processing, and improves work efficiency and processing quality.

CN223082868UActive Publication Date: 2025-07-11ZIBO JINCHUNTAI ABRASIVES CO LTD
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Patent Information

Application Number
CN202421811981.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-30
Publication Date
2025-07-11
Estimated Expiration
2034-07-30

AI Technical Summary

Technical Problem

The existing roller rollers need to be replaced as a whole after wear, resulting in high maintenance costs, time-consuming and laborious disassembly and unstable material processing quality.

Method used

A roller structure including a shaft body, a contact cylinder ring, a positioning ring and a fixing ring is designed. Through a detachable fixing method and vertical and horizontal groove design, the contact cylinder ring is replaced and stable, and combined with the elastic sealing ring and the plug-in and pull-out structure, the disassembly and assembly process is simplified and the material extrusion effect is optimized.

Benefits of technology

Reduce maintenance costs, improve work efficiency, and ensure the stability and uniformity of material processing quality.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a roller of a roller machine, which comprises a roller main body, the roller main body comprises a shaft body and contact cylinder rings, the contact cylinder rings are arranged at the outer end of the roller main body, one end of the shaft body is fixedly connected with a positioning ring, the other end of the shaft body is provided with a fixing ring, the fixing ring is detachably connected with the shaft body, the contact cylinder rings are arranged in multiple groups, and the contact cylinder rings are arranged in multiple groups. Transmission shafts are arranged at the two ends of the shaft body and located between the positioning ring and the fixing ring, fixing holes are formed in the transmission shafts, fixing rods are arranged in the fixing holes and are in sliding fit with the fixing holes, one ends of the fixing rods are rotationally connected with fixing arc rods, and inserting blocks are arranged at the other ends of the fixing arc rods; the roller is convenient to disassemble and assemble on the roller machine and convenient to replace, only a damaged part is replaced, and resource consumption is reduced.
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Description

Technical Field

[0001] The utility model relates to the technical field of roll crushers, and more specifically, it relates to a roll of a roll crusher. Background Art

[0002] A roll crusher is a processing equipment for industrial materials. With a set of internal rolls cooperating, it can crush industrial raw materials such as shale, industrial waste residue, mud, and clay to produce uniform fine materials, and is widely used in modern industrial production activities.

[0003] During actual production, for a roll crusher working for a long time, its rolls are in high-strength contact with the materials, and the surface of the rolls is prone to wear. When the wear amount is large, it will affect the subsequent material processing quality, and workers need to replace the entire roll. However, in most cases, only the surface of the drum is damaged, and the consumption of the roll is relatively large. Frequent replacement leads to a high maintenance cost of the roll crusher. Moreover, common rolls are mostly connected to the driving device of the roll crusher by means of threads. When disassembling, the roll needs to be rotated multiple times. Affected by the weight of the roll itself, workers need to consume a large amount of physical strength when disassembling and assembling the roll, and it will waste a lot of time, reducing work efficiency. In addition, the surfaces of common rolls are mostly smooth, and the extrusion effect on the materials is limited. During actual processing, the feeding speed of the materials is not constant, the feeding speed is uneven. When the feeding is too much, the extrusion of the roll is prone to blockage, and when the feeding is too little, the compaction density of the materials is relatively low, and it is prone to looseness, and the processing quality is unstable. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the utility model provides a roll of a roll crusher to solve the technical problem that the use effect of the roll of the roll crusher mentioned in the background art is limited.

[0005] To achieve the above object, the utility model provides the following technical solution: A roll of a roll crusher, including a roll body, the roll body includes a shaft body and a contact cylinder ring, the contact cylinder ring is arranged at the outer end of the roll body, one end of the shaft body is fixedly connected with a positioning ring, the other end is provided with a fixing ring, and the fixing ring is detachably connected with the shaft body. A plurality of groups of contact cylinder rings are arranged between the positioning ring and the fixing ring;

[0006] Drive shafts are arranged at both ends of the shaft body, fixing holes are opened on the drive shafts, fixing rods are arranged in the fixing holes, the fixing rods are slidably matched with the fixing holes, one end of the fixing rod is rotatably connected with a fixing arc rod, an insertion block is arranged at the other end of the fixing arc rod, and a fixing groove is opened on the fixing rod, and the fixing groove is matched with the insertion block.

[0007] The present utility model is further configured such that longitudinal grooves and transverse grooves are provided on the fixed ring. A plurality of groups of longitudinal grooves and transverse grooves are provided, and they are arranged perpendicular to each other. In addition, the corresponding longitudinal grooves and transverse grooves on the contact cylinder rings on two cooperating roller bodies are arranged staggeredly to improve the extrusion effect.

[0008] The present utility model is further configured such that a positioning rod is provided on one side of the positioning ring, positioning holes are provided on the contact cylinder ring, and the positioning rod cooperates with the positioning holes to ensure the stability of the contact cylinder ring.

[0009] The present utility model is further configured such that a first hole groove is provided on the positioning rod, a first opening is provided on the fixed ring, a first bolt is provided in the first opening, and the first bolt cooperates with the first hole groove and the first opening to make the cooperation between the fixed ring and the contact cylinder ring stable.

[0010] The present utility model is further configured such that a fitting groove is provided on the shaft body, the fixed ring cooperates with the fitting groove, a second hole groove is provided in the fitting groove, a second opening is provided on the fixed ring, a second bolt is provided in the second opening, and the second bolt cooperates with the second hole groove and the second opening to make the cooperation between the fixed ring and the shaft body stable.

[0011] The present utility model is further configured such that an elastic sealing ring is provided between the contact cylinder rings to protect the contact cylinder rings.

[0012] The present utility model is further configured such that a movable groove is provided in the fixed groove, a movable member is provided in the movable groove, a positioning head is provided on the movable member, a positioning groove is provided on the insertion block, and the positioning head cooperates with the positioning groove to limit and position the insertion block.

[0013] The present utility model is further configured such that a compression spring is provided between the movable member and the inner wall of the movable groove, a pressing head is provided at one end of the fixed rod, the pressing head is slidably matched with the fixed rod and is connected to the movable member, which is convenient for controlling the limitation of the insertion block.

[0014] Compared with the prior art, the present utility model provides a pair of roller machine rollers, having the following beneficial effects:

[0015] Through the cooperation of the shaft body and a plurality of contact cylinder rings, a roller body is formed, and the positioning ring, fixed ring, positioning rod, first bolt and second bolt are cooperated for detachable fixation. During work, the contact cylinder ring contacts with the material for processing. After the contact cylinder ring is damaged, the contact cylinder ring can be replaced separately, and equipment such as the shaft body can be retained, thereby saving the consumption of resources.

[0016] Through the cooperation of the fixing rod and the fixing hole, a fixing structure is provided, and the limitation is carried out through the cooperation of the insertion block and the fixing groove. The plug-and-play structure replaces the bolt fixing method, making it more convenient for workers to disassemble and assemble the roller, reducing the workload, saving time, and improving work efficiency.

[0017] Through the cooperation of the longitudinal groove and the transverse groove, the appearance of the contact cylinder ring is enriched. When contacting the material, the material can be extruded more effectively. And when the feeding speed of the material is uneven, if the amount of material is too small, part of the material will be temporarily stored in the groove space, located in the protruding part of the contact cylinder ring and the groove of another group of contact cylinder rings, and slowly discharged, cooperating with the newly added material to improve the extrusion effect of the material and provide density. When the amount of material is too large, the material in the groove will be extruded, so as to provide enough space for the processing of the material, without causing too much pressure on the material, protecting the material and the roller equipment, and ensuring the processing quality. Brief Description of the Drawings

[0018] Figure 1 It is a front view structure schematic diagram of a roller of a pair-roller machine in the present utility model;

[0019] Figure 2 It is a schematic diagram of the cooperation structure between the contact cylinder ring and the shaft body during installation in the present utility model;

[0020] Figure 3 It is a schematic diagram of the structure after the contact cylinder ring is disassembled in the present utility model;

[0021] Figure 4 It is a schematic diagram of the structure after the fixing rod is disassembled in the present utility model;

[0022] Figure 5 It is a cross-sectional view of the cooperation structure between the internal moving part of the fixing rod and the insertion block in the present utility model.

[0023] In the figure: 1, roller main body; 2, shaft body; 3, contact cylinder ring; 4, positioning ring; 5, fixing ring; 6, transmission shaft; 7, fixing hole; 8, fixing rod; 9, fixing arc rod; 10, insertion block; 11, fixing groove; 12, longitudinal groove; 13, transverse groove; 14, positioning rod; 15, positioning hole; 16, first hole groove; 17, first opening; 18, first bolt; 19, fitting groove; 20, second hole groove; 21, second opening; 22, second bolt; 23, elastic sealing ring; 24, moving groove; 25, moving part; 26, positioning head; 27, positioning groove; 28, pressure spring; 29, pressing head. Detailed Embodiment

[0024] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0026] In the present utility model, in the absence of contrary description, the orientations such as "upper, lower" are generally in reference to the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions; similarly, for the convenience of understanding and description, "left, right" are generally in reference to the left and right shown in the drawings; "inner, outer" refer to the inner and outer of the contour of each component itself, but the above orientation terms are not used to limit the present utility model.

[0027] Please refer to Figures 1-5 , a roller of a pair-roller machine, comprising a roller main body 1, the roller main body 1 comprising a shaft body 2 and a contact cylinder ring 3, the contact cylinder ring 3 being arranged at the outer end of the roller main body 1, one end of the shaft body 2 being fixedly connected with a positioning ring 4, the other end being provided with a fixing ring 5, and the fixing ring 5 being detachably connected to the shaft body 2, a plurality of groups of contact cylinder rings 3 being arranged and located between the positioning ring 4 and the fixing ring 5;

[0028] Both ends of the shaft body 2 are provided with transmission shafts 6, the transmission shafts 6 are provided with fixing holes 7, fixing rods 8 are arranged in the fixing holes 7, the fixing rods 8 are slidably matched with the fixing holes 7, one end of the fixing rod 8 is rotatably connected with a fixing arc rod 9, the other end of the fixing arc rod 9 is provided with an insertion block 10, and the fixing rod 8 is provided with a fixing groove 11 which is matched with the insertion block 10.

[0029] In this embodiment, through the support of the shaft body 2 in the middle, the corresponding number of contact cylinder rings 3 are sleeved on the roller main body 1 in sequence, the contact cylinder rings 3 are restricted by the positioning ring 4, and after the installation of the contact cylinder rings 3 is completed, the fixing ring 5 is installed. Through the cooperation of the fixing ring 5 and the positioning ring 4, a plurality of contact cylinder rings 3 are fixed, so that the contact cylinder rings 3 and the shaft body 2 cooperate to form the roller main body 1. Under the support of the shaft body 2, the contact cylinder rings 3 are in contact with the material to be processed to process the material. And when the contact cylinder rings 3 are damaged, it is not necessary to replace the entire roller main body 1. Only need to disassemble the fixing ring 5 and then replace the damaged contact cylinder rings 3. If there is only one damaged contact cylinder ring 3, the corresponding contact cylinder ring 3 can also be replaced alone, and the other contact cylinder rings 3 can continue to be used.

[0030] More specifically, through the drive shafts 6 at both ends, the roller body 1 is connected to the driving device of the pair-roller machine. First, the fixing rod 8 is disassembled, the drive shaft 6 is inserted into the installation structure of the pair-roller machine, and then the fixing rod 8 is installed. The fixing rod 8 passes through the installation structure of the pair-roller machine and simultaneously passes through the fixing hole 7. Then, the fixing arc rod 9 is rotated so that the front end of the fixing arc rod 9 contacts the fixing rod 8, and the insertion block 10 is inserted into the fixing groove 11 to fix the fixing rod 8. Thus, the drive shaft 6 is connected to the pair-roller machine through the fixing rod 8, and the installation of the roller body 1 is completed.

[0031] Please refer to Figure 1 and Figure 5 , as an implementation method for optimizing breakage: Longitudinal grooves 12 and transverse grooves 13 are formed on the fixing ring 5. Multiple groups of longitudinal grooves 12 and transverse grooves 13 are provided and are perpendicular to each other.

[0032] Specifically, when two groups of roller bodies 1 cooperate to crush materials, through the action of the longitudinal grooves 12 and transverse grooves 13, the longitudinal grooves 12 and transverse grooves 13 on the two groups of roller bodies 1 cooperate with each other. When in contact, the outer ends of the longitudinal grooves 12 on the roller body 1 will be in close contact with the inside of the longitudinal grooves 12 on another roller body 1, and the outer ends of the transverse grooves 13 on the roller body 1 will be in close contact with the inside of the transverse grooves 13 on another roller body 1, so as to fully extrude the materials and improve the processing effect on the materials.

[0033] Please refer to Figure 2 , as a further implementation method for the contact cylinder ring: A positioning rod 14 is provided on one side of the positioning ring 4, and a positioning hole 15 is formed on the contact cylinder ring 3. The positioning rod 14 cooperates with the positioning hole 15.

[0034] Specifically, when installing the contact cylinder ring 3, by aligning the positioning hole 15 with the positioning rod 14, the positioning rod 14 passes through the positioning hole 15, so that the contact cylinder ring 3 is sleeved on the shaft body 2, and the contact cylinder ring 3 is restricted by the positioning rod 14 to prevent the contact cylinder ring 3 from rotating and ensure the stability of the contact cylinder ring 3.

[0035] Please refer to Figure 2 , as a further implementation method for the positioning rod: A first hole groove 16 is formed on the positioning rod 14, a first opening 17 is formed on the fixing ring 5, and a first bolt 18 is provided in the first opening 17. The first bolt 18 cooperates with the first hole groove 16 and the first opening 17.

[0036] Specifically, when installing the fixing ring 5, the fixing ring 5 is pressed against the positioning rod 14, the contact cylinder ring 3 is restricted by the fixing ring 5, and the first opening 17 is aligned with the first hole groove 16. Then, the first bolt 18 is passed through the first opening 17 and inserted into the first hole groove 16 and tightened to fix the fixing ring 5.

[0037] Please refer to Figure 2 As a further implementation of the fixing ring: a fitting groove 19 is provided on the shaft body 2, the fixing ring 5 cooperates with the fitting groove 19, a second hole groove 20 is provided in the fitting groove 19, a second opening 21 is provided on the fixing ring 5, a second bolt 22 is provided in the second opening 21, and the second bolt 22 cooperates with the second hole groove 20 and the second opening 21.

[0038] Specifically, when installing the fixing ring 5, the fixing ring 5 is inserted into the fitting groove 19, the fixing ring 5 is in contact with the shaft body 2, and the second hole groove 20 is aligned with the second opening 21, and then the second bolt 22 is passed through the second opening 21 and inserted into the second hole groove 20, and tightened to fix.

[0039] Please refer to Figure 2 As a further implementation of the contact tube ring: an elastic sealing ring 23 is provided between the contact tube rings 3.

[0040] Specifically, when the contact tube rings 3 are installed, an elastic sealing ring 23 is placed between the contact tube rings 3 , so that the elastic sealing ring 23 improves the fitting effect between the contact tube rings 3 .

[0041] Please refer to Figure 5 As a further implementation of the fixing rod: a movable groove 24 is provided in the fixing groove 11, a movable part 25 is provided in the movable groove 24, a positioning head 26 is provided on the movable part 25, a positioning groove 27 is provided on the insertion block 10, and the positioning head 26 cooperates with the positioning groove 27.

[0042] Specifically, after the insertion block 10 is inserted into the fixed groove 11, the movable part 25 is controlled to move in the movable groove 24 so that the movable part 25 drives the positioning head 26 to move, and the positioning head 26 is inserted into the positioning groove 27 to restrict the insertion block 10 and prevent the insertion block 10 from escaping from the fixed groove 11.

[0043] Please refer to Figure 5 As a further implementation of the movable part: a pressure spring 28 is provided between the movable part 25 and the inner wall of the movable groove 24, and a pressing head 29 is provided at one end of the fixed rod 8. The pressing head 29 is slidably matched with the fixed rod 8 and connected to the movable part 25.

[0044] Specifically, the pressure spring 28 applies a thrust to the movable part 25, so that the fixed part remains stable and the positioning head 26 is stably matched with the positioning groove 27. By applying force to the pressing head 29, the pressing head 29 applies pressure to the movable part 25, driving the movable part 25 to move, causing the pressure spring 28 to contract, and the positioning head 26 to leave the positioning groove 27, thereby releasing the restriction on the insertion block 10.

[0045] In summary, when the overall equipment is in use (or running):

[0046] When using the device, install the roller body 1 into the roller press. Through the transmission shafts 6 at both ends, connect the roller body 1 with the driving device of the roller press. First, remove the fixing rod 8, insert the transmission shaft 6 into the installation structure of the roller press, and then install the fixing rod 8. Pass the fixing rod 8 through the installation structure of the roller press and simultaneously through the fixing hole 7. Then rotate the fixing arc rod 9 so that the front end of the fixing arc rod 9 contacts the fixing rod 8. Insert the insertion block 10 into the fixing groove 11. When the insertion block 10 is inserted into the fixing groove 11, by applying force to the pressing head 29, the pressing head 29 applies pressure to the movable part 25, driving the movable part 25 to move, controlling the movable part 25 to move in the movable groove 24, and causing the pressure spring 28 to contract, so that the movable part 25 drives the positioning head 26 to move, providing space for the insertion of the insertion block 10. After the insertion block 10 is inserted into the fixing groove 11, release the pressing head 29, the pressure spring 28 extends, pushing the movable part 25 to move, so that the positioning head 26 is inserted into the positioning groove 27. By the pressure spring 28 applying a thrust to the movable part 25, the fixing part is kept stable, so that the positioning head 26 is stably engaged with the positioning groove 27, restricting the insertion block 10 and preventing the insertion block 10 from disengaging from the fixing groove 11, fixing the fixing rod 8, and thus connecting the transmission shaft 6 with the roller press through the fixing rod 8 to complete the installation of the roller body 1. In addition, by applying force to the pressing head 29 and controlling the movement of the movable part 25 and the pressing head 29, the restriction on the insertion block 10 can be released.

[0047] Through the support of the shaft body 2 in the middle, the roller body 1 is composed of the cooperation of multiple contact cylinder rings 3 and the shaft body 2. After the two groups of roller bodies 1 are installed in the roller press, the two groups of roller bodies 1 cooperate with each other. The contact cylinder rings 3 are made of high manganese steel and have better performance. Supported by the shaft body 2, the contact cylinder rings 3 contact the material to be processed to process the material. And when the two groups of roller bodies 1 cooperate to crush the material, through the action of the longitudinal grooves 12 and the transverse grooves 13, the longitudinal grooves 12 and the transverse grooves 13 on the two groups of roller bodies 1 cooperate with each other. When contacting, the outer ends of the longitudinal grooves 12 on the roller body 1 will be closely attached to the inside of the longitudinal grooves 12 on another roller body 1, and the outer ends of the transverse grooves 13 on the roller body 1 will be closely attached to the inside of the transverse grooves 13 on another roller body 1, thereby fully squeezing the material and improving the processing effect on the material.

[0048] When the contact cylinder ring 3 is damaged, the roller body 1 is removed. It is not necessary to replace the entire roller body 1. Only need to remove the fixing ring 5 and then replace the damaged contact cylinder ring 3. If there is only one damaged contact cylinder ring 3, the corresponding contact cylinder ring 3 can also be replaced separately, and the other contact cylinder rings 3 can continue to be used. When replacing, put the corresponding number of contact cylinder rings 3 on the roller body 1 in sequence, and limit the contact cylinder rings 3 through the positioning ring 4. And when installing the contact cylinder rings 3, align the positioning holes 15 with the positioning rods 14, so that the positioning rods 14 pass through the positioning holes 15, thereby sleeving the contact cylinder rings 3 on the shaft body 2, and limit the contact cylinder rings 3 through the positioning rods 14 to prevent the contact cylinder rings 3 from rotating and ensure the stability of the contact cylinder rings 3. After completing the installation of the contact cylinder rings 3, install the fixing ring 5, make the fixing ring 5 close to the positioning rod 14, limit the contact cylinder rings 3 through the fixing ring 5, and align the first opening 17 with the first hole groove 16. Then insert the first bolt 18 through the first opening 17 into the first hole groove 16 and tighten it. Install the fixing ring 5 into the fitting groove 19 so that the fixing ring 5 contacts the shaft body 2, and align the second hole groove 20 with the second opening 21. Then insert the second bolt 22 through the second opening 21 into the second hole groove 20 and tighten it for fixation. Through the cooperation of the fixing ring 5 and the positioning ring 4, multiple contact cylinder rings 3 are fixed, so that the contact cylinder rings 3 and the shaft body 2 cooperate to form the roller body 1. In addition, when installing the contact cylinder rings 3, put an elastic sealing ring 23 between the contact cylinder rings 3 to improve the fitting effect between the contact cylinder rings 3.

[0049] In all the above-mentioned solutions, for the connection between two components, welding, the cooperation connection of bolts and nuts, bolt or screw connection or other well-known connection methods can be selected according to the actual situation, which will not be elaborated one by one here. For those mentioned above that involve fixed connection, welding is preferably considered. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A roll of a roll crusher, comprising a roll body (1), characterized in that: The roller body (1) includes a shaft body (2) and a contact cylinder ring (3). The contact cylinder ring (3) is arranged at the outer end of the roller body (1). One end of the shaft body (2) is fixedly connected with a positioning ring (4), and the other end is provided with a fixing ring (5). The fixing ring (5) is detachably connected to the shaft body (2). A plurality of groups of contact cylinder rings (3) are arranged between the positioning ring (4) and the fixing ring (5). Drive shafts (6) are arranged at both ends of the shaft body (2). Fixing holes (7) are formed in the drive shafts (6). A fixing rod (8) is arranged in the fixing holes (7). The fixing rod (8) is slidably matched with the fixing holes (7). One end of the fixing rod (8) is rotatably connected with a fixing arc rod (9). An insertion block (10) is arranged at the other end of the fixing arc rod (9). A fixing groove (11) is formed in the fixing rod (8). The fixing groove (11) is matched with the insertion block (10).

2. The roll of the roll crusher according to claim 1, characterized in that: Longitudinal grooves (12) and transverse grooves (13) are formed in the fixing ring (5). A plurality of groups of longitudinal grooves (12) and transverse grooves (13) are arranged and are perpendicular to each other.

3. A pair-roll machine roll cylinder according to claim 1, characterized in that: A positioning rod (14) is arranged on one side of the positioning ring (4). A positioning hole (15) is formed in the contact cylinder ring (3). The positioning rod (14) is matched with the positioning hole (15).

4. The roll of a roll crusher according to claim 3, wherein: A first hole groove (16) is formed in the positioning rod (14). A first opening (17) is formed in the fixing ring (5). A first bolt (18) is arranged in the first opening (17). The first bolt (18) is matched with the first hole groove (16) and the first opening (17).

5. The roll of a roll crusher according to claim 1, characterized in that: A fitting groove (19) is formed in the shaft body (2). The fixing ring (5) is matched with the fitting groove (19). A second hole groove (20) is formed in the fitting groove (19). A second opening (21) is formed in the fixing ring (5). A second bolt (22) is arranged in the second opening (21). The second bolt (22) is matched with the second hole groove (20) and the second opening (21).

6. The roll of a roll crusher according to claim 1, characterized in that: An elastic sealing ring (23) is arranged between the contact cylinder rings (3).

7. The roll of a roll crusher according to claim 1, characterized in that: An activity groove (24) is formed in the fixing groove (11). An activity part (25) is arranged in the activity groove (24). A positioning head (26) is arranged on the activity part (25). A positioning groove (27) is formed in the insertion block (10). The positioning head (26) is matched with the positioning groove (27).

8. The roll of a roll crusher according to claim 7, characterized in that: A pressure spring (28) is arranged between the activity part (25) and the inner wall of the activity groove (24). A pressing head (29) is arranged at one end of the fixing rod (8). The pressing head (29) is slidably matched with the fixing rod (8) and is connected with the activity part (25).