Double-roller machine and roller wheel assembly thereof

Abstract

The utility model relates to a double-roller machine and a roller wheel assembly thereof, and belongs to the field of double-roller machines. The roller wheel assembly comprises a main shaft and a grinding roller, a positioning step is arranged on the main shaft, the outer diameter of the positioning step is gradually reduced from one end to the other end, the inner wall of the grinding roller is matched with the outer wall of the positioning step in size, and the positioning step is sleeved with the grinding roller. And one end, with a smaller inner diameter, of the grinding roller is connected with an axial pressure mechanism. According to the utility model, the outer wall of the positioning step and the inner wall of the grinding roller are conical, so that a larger contact area is formed between the positioning step and the grinding roller, in addition, when the grinding roller is mounted, the grinding roller is sleeved on the positioning step from the small end of the positioning step, and the axial thrust is applied to the grinding roller by utilizing the axial pressure mechanism, so that the grinding roller can be stably mounted. And the conical inner wall of the grinding roller is tightly attached to the conical outer wall of the positioning step by utilizing thrust.

Description

Double roller mill and its roller assembly Technical Field

[0001] This utility model belongs to the field of double roller machines, and in particular to a double roller machine and its roller assembly. Background Technology

[0002] High-pressure double-roll mills are used for crushing materials. Specifically, the main body of a high-pressure double-roll mill consists of two rollers rotating in opposite directions. Brittle materials such as sand and gravel enter the space between two identical, relatively rotating rollers through the feeding device of the high-pressure double-roll mill. The material is pulled into the gap between the rollers at the top of the rollers, and high pressure is used to compress the material into a dense cake. Finally, the material falls from the gap between the rollers, passes through the discharge hopper, and is lifted out by the conveying equipment.

[0003] The roller assembly consists of a main shaft and a grinding roller fitted onto the surface of the main shaft. The grinding roller is made of wear-resistant material to reduce maintenance frequency. The main shaft is mounted on a bearing housing via bearings. Currently, the grinding roller can be fixed to the main shaft using conventional connectors such as screws and pins. However, this method makes it difficult to ensure a tight fit between the grinding roller and the main shaft, resulting in a certain clearance. This clearance can only be controlled by improving dimensional accuracy, which is quite challenging. This clearance can easily cause vibration in the grinding roller, accelerating its wear. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a roller mill and its roller assembly, which can promote the tight fit between the grinding roller and the main shaft and improve the stability of the grinding roller installation.

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows: a roller assembly, including a main shaft and a grinding roller, wherein a positioning step is provided on the main shaft, the outer diameter of the positioning step gradually decreases from one end to the other end, the inner wall of the grinding roller is adapted to the outer wall size of the positioning step, and the grinding roller is sleeved on the positioning step; an axial pressure mechanism is connected to the end of the grinding roller with the smaller inner diameter.

[0006] Furthermore, the end of the positioning step with the larger diameter is provided with an end face limiting structure.

[0007] Furthermore, the end face limiting structure includes a retaining ring integrally formed with the positioning step, and the end face with the larger inner diameter of the grinding roller abuts against the side wall of the retaining ring.

[0008] Furthermore, the axial pressure mechanism includes a sliding sleeve, which is sleeved on the main shaft and slides in cooperation with the main shaft. The sliding sleeve is connected to the positioning step by a locking screw, and the axial direction of the locking screw is consistent with the axial direction of the positioning step. The sliding sleeve is provided with a first axial pressure transmission surface, and the end of the grinding roller with a smaller inner diameter is provided with a second axial pressure transmission surface, which is in contact with the first axial pressure transmission surface.

[0009] Furthermore, a pressure transmission sleeve is provided at the end of the grinding roller with a smaller inner diameter, the second axial pressure transmission surface is the inner wall of the pressure transmission sleeve, and the diameter of the inner wall gradually increases from the end near the positioning step to the end away from the positioning step; the first axial pressure transmission surface is the outer wall of the sliding sleeve.

[0010] Furthermore, the positioning step is integrally formed with the main shaft.

[0011] Furthermore, one end of the main shaft is provided with an axially extending first oil hole, which is connected to a radially extending second oil hole, which extends to the outer wall of the positioning step.

[0012] A roller mill, including the roller assembly described above.

[0013] The beneficial effects of this utility model are: the outer wall of the positioning step and the inner wall of the grinding roller are set as conical, so that there is a larger contact area between the positioning step and the grinding roller. In addition, when installing the grinding roller, the grinding roller is put onto the positioning step from the small end of the positioning step, and the axial pressure mechanism is used to apply axial thrust to the grinding roller. The thrust is used to make the conical inner wall of the grinding roller fit tightly against the conical outer wall of the positioning step.

[0014] This invention can make the grinding roller fit more tightly with the positioning step, reduce vibration, improve the stability of the grinding roller installation, and help reduce the maintenance frequency of the grinding roller. Attached Figure Description

[0015] Figure 1 is a cross-sectional schematic diagram of the roller assembly of this utility model;

[0016] Reference numerals: 1—Main shaft; 11—Sliding sleeve; 12—Second oil hole; 2—Grinding roller; 21—Pressure transmission sleeve; 3—Positioning step; 4—End face limiting structure; 5—Sliding sleeve; 6—Locking screw. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] The roller assembly of this utility model, as shown in Figure 1, includes a main shaft 1 and a grinding roller 2. A positioning step 3 is provided on the main shaft 1. The outer diameter of the positioning step 3 gradually decreases from one end to the other end. The inner wall of the grinding roller 2 is adapted to the outer wall size of the positioning step 3, that is, the inner diameter of the grinding roller 2 gradually decreases from one end to the other end, and the grinding roller 2 is sleeved on the positioning step 3. An axial pressure mechanism is connected to the end of the grinding roller 2 with the smaller inner diameter.

[0019] The positioning step 3 is fixed to the main shaft 1, which can be achieved through welding or other methods. In a preferred embodiment, the positioning step 3 and the main shaft 1 are integrally formed, ensuring the connection strength between them and guaranteeing high coaxiality and positional accuracy. The outer wall of the positioning step 3 is tapered, and similarly, the inner wall of the grinding roller 2 is also tapered, allowing the outer wall of the positioning step 3 and the inner wall of the grinding roller 2 to fit together. The tapered mating surface increases the mating area between the positioning step 3 and the grinding roller 2, improving the stability of the fit.

[0020] The axial pressure mechanism is used to apply an axial force to the grinding roller 2. The direction of the force is from the end with the smaller inner diameter of the grinding roller 2 to the end with the larger inner diameter. Under the action of this axial force, the inner wall of the grinding roller 2 can fit tightly against the outer wall of the positioning step 3, thereby reducing the fit clearance between the grinding roller 2 and the positioning step 3. The grinding roller 2, the positioning step 3 and the main shaft 1 become a tighter whole, which can effectively reduce the vibration of the grinding roller 2, which is conducive to improving the service life of the grinding roller 2 and reducing the maintenance frequency.

[0021] To ensure the stability of the grinding roller 2 during installation, an end face limiting structure 4 is provided at the larger diameter end of the positioning step 3. The end face limiting structure 4 is used to limit the end face of the grinding roller 2. Specifically, the end face limiting structure 4 includes a retaining ring integrally formed with the positioning step 3, and the end face of the grinding roller 2 with the larger inner diameter abuts against the side wall of the retaining ring. When installing the grinding roller 2, the grinding roller 2 is fitted onto the positioning step 3, and then pressure is applied to the grinding roller 2 using an axial pressure mechanism to push the grinding roller 2 to move axially, causing the grinding roller 2 to make close contact with the main shaft 1. After the grinding roller 2 is in close contact with the main shaft 1, the end of the grinding roller 2 away from the axial pressure mechanism abuts against the end face limiting structure 4. The end face limiting structure 4 and the axial pressure mechanism respectively position the two ends of the grinding roller 2, improving the positioning stability of the grinding roller 2.

[0022] In this utility model, the axial pressure mechanism includes a sliding sleeve 5, which is sleeved on the main shaft 1 and slides in cooperation with the main shaft 1. The sliding sleeve 5 is connected to the positioning step 3 by a locking screw 6, and the axial direction of the locking screw 6 is consistent with the axial direction of the positioning step 3. A first axial pressure transmission surface is provided on the sliding sleeve 5, and a second axial pressure transmission surface is provided at the end of the grinding roller 2 with a smaller inner diameter. The second axial pressure transmission surface is in contact with the first axial pressure transmission surface.

[0023] After the grinding roller 2 is placed on the positioning step 3, the sliding sleeve 5 is placed on the main shaft 1. Then the sliding sleeve 5 is moved axially, and multiple locking screws 6 are used to connect the sliding sleeve 5 to the positioning step 3. Then the locking screws 6 are rotated to continue to drive the sliding sleeve 5 toward the grinding roller 2, so that the first axial pressure transmission surface is in contact with the second axial pressure transmission surface, thereby transmitting the axial pressure to the grinding roller 2.

[0024] The first axial pressure transmission surface can be the end face of the sliding sleeve 5, and the second axial pressure transmission surface can be the end face of the grinding roller 2. In a preferred embodiment, a pressure transmission sleeve 21 is provided at the end of the grinding roller 2 with a smaller inner diameter, and the pressure transmission sleeve 21 is integrally formed with the grinding roller 2. The second axial pressure transmission surface is the inner wall of the pressure transmission sleeve 21, and the diameter of the inner wall gradually increases from the end near the positioning step 3 to the end away from the positioning step 3. The first axial pressure transmission surface is the outer wall of the sliding sleeve 5, and the outer diameter of the sliding sleeve 5 gradually increases from the end near the positioning step 3 to the end away from the positioning step 3. The inner wall of the pressure transmission sleeve 21 and the outer wall of the sliding sleeve 5 are tapered. When the sliding sleeve 5 moves axially towards the positioning step 3, it pushes the pressure transmission sleeve 21 and the grinding roller 2 to move axially, thus transmitting axial pressure. The tapered design of the first and second axial pressure transmission surfaces increases the contact area between them and improves stability. After the grinding roller 2 is locked, there is a gap between the sliding sleeve 5 and the positioning step 3.

[0025] Because the grinding roller 2 and the positioning step 3 are tightly connected, a large force is required to separate the grinding roller 2 from the positioning step 3 during maintenance and replacement. Manual separation is difficult and laborious. To facilitate the disassembly of the grinding roller 2, this invention provides an axially extending first oil hole 11 at one end of the main shaft 1. The first oil hole 11 is a blind hole, and it is connected to a radially extending second oil hole 12, which extends to the outer wall of the positioning step 3.

[0026] When disassembling the grinding roller 2, the port of the first oil hole 11 is connected to the hydraulic oil supply system. Hydraulic oil is then pumped into the first oil hole 11 using an oil pump or similar equipment. The hydraulic oil travels along the first oil hole 11 and the second oil hole 12 to the space between the grinding roller 2 and the positioning step 3, acting as a lubricant and reducing disassembly resistance. Furthermore, by pressurizing the hydraulic oil to a higher pressure, the hydraulic oil between the grinding roller 2 and the positioning step 3 can automatically separate the grinding roller 2, facilitating effortless disassembly.

[0027] The present invention relates to a double-roll mill, comprising two roller assemblies as shown in Figure 1. These two roller assemblies are parallel to each other and rotate in opposite directions at the same speed under the drive of a motor, thereby crushing the material between the two grinding rollers 2. Other components of the double-roll mill can be manufactured using existing technology.

[0028] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A roller assembly, comprising a main shaft (1) and a grinding roller (2), characterized in that: The main shaft (1) is provided with a positioning step (3), the outer diameter of the positioning step (3) gradually decreases from one end to the other end, the inner wall of the grinding roller (2) is adapted to the outer wall size of the positioning step (3), and the grinding roller (2) is sleeved on the positioning step (3); the end of the grinding roller (2) with a smaller inner diameter is connected to an axial pressure mechanism.

2. The roller assembly as claimed in claim 1, characterized in that: The positioning step (3) has an end face limiting structure (4) at the larger diameter end.

3. The roller assembly as described in claim 2, characterized in that: The end face limiting structure (4) includes a retaining ring integrally formed with the positioning step (3), and the end face with a larger inner diameter of the grinding roller (2) abuts against the side wall of the retaining ring.

4. The roller assembly as claimed in claim 1, characterized in that: The axial pressure mechanism includes a sliding sleeve (5), which is sleeved on the main shaft (1) and slides in cooperation with the main shaft (1). The sliding sleeve (5) is connected to the positioning step (3) by a locking screw (6), and the axial direction of the locking screw (6) is consistent with the axial direction of the positioning step (3). A first axial pressure transmission surface is provided on the sliding sleeve (5), and a second axial pressure transmission surface is provided at the end of the grinding roller (2) with a smaller inner diameter. The second axial pressure transmission surface is in contact with the first axial pressure transmission surface.

5. The roller assembly as claimed in claim 4, characterized in that: The grinding roller (2) is provided with a pressure transmission sleeve (21) at the end with a smaller inner diameter. The second axial pressure transmission surface is the inner wall of the pressure transmission sleeve (21). The diameter of the inner wall gradually increases from the end near the positioning step (3) to the end away from the positioning step (3). The first axial pressure transmission surface is the outer wall of the sliding sleeve (5).

6. The roller assembly as claimed in claim 1, characterized in that: The positioning step (3) is integrally formed with the main shaft (1).

7. The roller assembly as claimed in claim 6, characterized in that: One end of the main shaft (1) is provided with an axially extending first oil hole (11), the first oil hole (11) is connected to a radially extending second oil hole (12), and the second oil hole (12) extends to the outer wall of the positioning step (3).

8. A double-roll mill, characterized in that: Includes the roller assembly as described in claim 1.

Images