A limiting structure of a segmented shaft sleeve and a roller shaft
By designing a detachable segmented bushing limiting structure with an interference fit to the shaft core, combined with a stress avoidance zone and an arc surface structure, the problem of easy damage and high replacement cost of the limiting structure in high-pressure roller mills is solved, achieving low-cost maintenance and equipment stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU LEEJUN IND CO LTD
- Filing Date
- 2025-06-26
- Publication Date
- 2026-06-19
AI Technical Summary
The existing high-pressure roller mill's segmented bushings require complete replacement of the shaft core when damaged, resulting in high maintenance and increased production costs. Furthermore, the limiting structure is susceptible to stress concentration damage.
A limiting structure for a segmented bushing is designed to be detachably connected to the shaft core. Circumferential and axial positioning is achieved through an interference fit. Stress relief zones and arc-shaped structures are used to avoid stress concentration. Wedge keys and locking components are used for fixation.
The detachable and replaceable limit structure reduces maintenance and production costs, while avoiding stress concentration and improving the stability and ease of use of the equipment.
Smart Images
Figure CN224371552U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of roller mill technology, and more specifically, to a limiting structure for a segmented bushing and a roller. Background Technology
[0002] High-pressure roller mills (roller presses) are becoming increasingly widely used and their technology is becoming more mature. Roller sleeves, also known as bushings, are components that come into direct contact with the material and are important factors affecting the efficiency and cost of high-pressure roller mills (roller presses).
[0003] Conventional integral bushings are directly fitted onto the shaft core. Once the bushing wears to a certain extent, the entire bushing must be replaced. Replacing the bushing requires disassembling the upper frame, feeding device, reducer, bearing housing, bearings, and other components to remove the old bushing, install the new bushing, then install the bearings, bearing housing, and other components. Finally, it is reinstalled on the frame, the reducer is reconnected, and the feeding device is reinstalled to resume production. The entire process is time-consuming and labor-intensive, resulting in high operator workload, low replacement efficiency, and high bushing and replacement costs.
[0004] In Chinese patent application number 2022104256149, entitled "A Segmentable Roller Shaft and its Segmentation Method," axial and circumferential positioning and fixing are achieved through the cooperation of a key fixed on the shaft core, segmented bushings, and wedge-shaped keys set on the segmented bushings; for example... Figure 7 As shown, however, during use, the segmented bushing will apply a large stress to the key, causing the key to break at the stress concentration point; since the key and the shaft are integrally molded, the entire shaft must be replaced after damage, resulting in high maintenance costs; the integral molding design means that both are made of the same material, which also greatly increases the production and processing costs. Utility Model Content
[0005] The technical problem to be solved by this utility model is to provide a limiting structure and roller shaft for a segmented bushing. By detachably connecting the limiting structure and the shaft core, the problem of having to replace the entire shaft core when the limiting structure is damaged is effectively avoided. At the same time, by detachably connecting the two, the material of the limiting structure is no longer the same as that of the shaft core, which greatly reduces the production, processing and maintenance costs.
[0006] The solution adopted by this utility model to solve the technical problem is:
[0007] on the one hand,
[0008] This utility model provides a limiting structure for a segmented bushing, which is detachably connected to the shaft core.
[0009] In some possible implementations, a mounting groove for mounting a limiting structure is provided on the shaft core; the limiting structure includes a mounting part installed in the mounting groove and a mating part provided on the mounting part and cooperating with the segmented shaft sleeve.
[0010] In some possible implementations, the outer surface of the mating part includes two sets of symmetrically arranged stress relief zones located at both ends of the outer surface along the axial direction of the shaft core, and an abutment zone disposed between the two sets of stress relief zones; the abutment zone is disposed between the two sets of stress relief zones and connected to each other; the abutment zone is coplanar with the outer surface of the mounting part.
[0011] In some possible implementations, the abutment area includes an abutment surface and two sets of arc surfaces disposed between the abutment surface and the stress relief area and respectively connected to the end of the abutment surface and the stress relief area.
[0012] In some possible implementations, the stress relief area is a groove-shaped structure, and the apex of the arc surface is located on the side close to the outer side of the limiting structure.
[0013] In some possible implementations, the mating part has a convex-shaped structure, including a large end with an outer surface and a small end connected to the large end and disposed on one side of the inner surface of the large end, wherein the two ends of the small end along the axial direction of the shaft core form an L-shaped groove with the large end;
[0014] The small end is provided with a flared groove on the side away from the large end, which is used to cooperate with the segmented bushing, and the large end of the groove has an opening.
[0015] In some possible implementations, in the L-shaped groove and stress relief area on the same side, the distance between the side of the L-shaped groove at the small end and the end face of the large end on that side is A, and the distance between the side of the stress relief area near the arc surface and the end face of the large end on that side is B, where B≥A.
[0016] In some possible implementations, the limiting structure is interference-fitted with the mounting groove.
[0017] on the other hand,
[0018] This utility model provides a roller shaft, including a shaft core, a limiting structure arranged circumferentially along the shaft core and as described above, a segmented bushing that cooperates with the mating part in the limiting structure, and a locking member for locking the segmented bushing and the limiting structure.
[0019] In some possible implementations, the segmented bushing includes a body with a keyway and a wedge key disposed within the keyway and used in conjunction with a mating part.
[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0021] This utility model uses a limiting structure to install itself in the mounting groove of the shaft core by interference fit, which can effectively achieve circumferential and axial positioning and fixation with the segmented shaft sleeve, can withstand large impact forces, and effectively prevent the segmented shaft sleeve from vibrating relative to the shaft core during operation.
[0022] Because the limiting structure is detachable, this utility model makes it easy to replace when the limiting mechanism is damaged. At the same time, it also allows the limiting structure and the shaft core to be processed with different materials, which greatly reduces the production and processing costs.
[0023] This utility model effectively avoids stress concentration after the mating part is assembled with the segmented bushing by setting a stress relief zone and an arc-shaped surface on the outside of the mating part;
[0024] This utility model has a simple structure, is highly practical, and is easy to assemble and disassemble. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the limiting structure, shaft core, and mounting groove in this utility model;
[0026] Figure 2 This is a three-dimensional schematic diagram of the limiting structure in this utility model;
[0027] Figure 3 This is a schematic diagram of the groove and L-shaped groove in this utility model;
[0028] Figure 4 This is a top view of the present invention;
[0029] Figure 5 This is a cross-sectional view of the roller shaft in this utility model;
[0030] Figure 6 This is a schematic diagram showing the connection relationship between the central shaft, segmented bushing, wedge key, and locking component of this utility model;
[0031] Figure 7 This is a schematic diagram illustrating stress concentration in existing technologies.
[0032] Among them: 10, shaft core; 101, mounting groove; 1, mounting part; 2, mating part; 201, stress relief area; 202, arc surface; 203, abutment area; 21, large end; 22, small end; 221, groove; 23, L-shaped groove; 20, segmented bushing; 201, wedge key; 30, locking element. Detailed Implementation
[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the existence of at least one. In the implementation of this application, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple positioning posts refer to two or more positioning posts. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0034] The present invention will now be described in detail.
[0035] on the one hand,
[0036] like Figures 1-6 As shown, this utility model provides a limiting structure for a segmented bushing 20, which is detachably connected to the shaft core 10. Specifically, the limiting structure is assembled with the segmented bushing 20 and the shaft core 10 by an interference fit. The segmented bushing 20 has the same structure as the segmented bushing in Chinese Patent Application No. 2022104256149.
[0037] In some possible implementations, in order to effectively connect the limiting structure with the shaft core 10 and the segmented bushing 20, a mounting groove 101 for installing the limiting structure is provided on the shaft core 10. The limiting structure includes a mounting part 1 installed in the mounting groove 101 and a mating part 2 provided on the mounting part 1 and installed in conjunction with the segmented bushing 20. The mounting part 1 is detachably installed in the mounting groove 101, and the mating part 2 is provided on the top surface of the mounting part 1 for mating with the segmented bushing 20, thereby realizing the connection between the segmented bushing 20 and the limiting structure.
[0038] This limiting structure is the same as the key structure in Chinese Patent Application No. 2022104256149. The difference is that, in order to avoid damage due to stress concentration, the outer side of the mating part 2 includes two sets of symmetrically arranged stress relief areas 201 located at both ends of the outer side along the axial direction of the core 10, and an abutment area disposed between the two sets of stress relief areas 201.
[0039] The abutment area is located between the two sets of stress relief areas 201 and is connected to the two sets of stress relief areas 201 at a distance from each other; the abutment area is coplanar with the outer surface of the mounting part 1;
[0040] The stress relief area 201 will prevent stress concentration after the segmented bushing 20 and the mating part 2 are assembled. The abutment area will be used as the assembly surface when the keyway of the segmented bushing 20 and the limiting structure are assembled. After the wedge key 40 of the segmented bushing 20 tightens the limiting structure and the keyway to achieve an interference fit, the stress relief area 201 will also contact the inner side of the keyway in the segmented bushing 20, thereby avoiding stress concentration.
[0041] In some possible implementations, the abutment area includes an abutment surface 203 and two sets of arc surfaces 202 disposed between the abutment surface 203 and the stress relief area 201 and respectively connected to the end of the abutment surface 203 and the stress relief area 201;
[0042] Specifically, the stress relief area 201 has a groove-shaped structure, which ensures that the stress relief area 201 will not directly contact the inner side of the keyway when it is assembled with the keyway of the segmented bushing 20.
[0043] The vertex of the arc surface 202 is located on the side close to the outer side of the limiting structure; when the mating part 2 is assembled with the segmented bushing 20, the vertex of the arc surface 202 and the inner side of the keyway in the segmented bushing 20 are in a small clearance fit, and the distance between the stress relief area 201 and the inner side of the keyway is greater than the distance between the top surface of the arc surface 202 and the inner side of the keyway.
[0044] The arc surface 202 acts as a transition section, connecting the stress relief area 201 and the contact surface 203. When the segmented bushing 20 and the mating part 2 are installed, the contact surface 203 and the keyway of the segmented bushing 20 are interference-fitted. When tightened, the stress relief area 201 and the arc surface 202 will contact the inner side of the keyway, so that the stress is uniform and no breakage or damage will occur.
[0045] Furthermore, the length of the contact surface 203 along the axial direction of the shaft core 10 is l, and the length of the limiting structure along the axial direction of the shaft core 10 is L, where l = 0.4-0.75L. This effectively ensures that the two can achieve an interference fit and that the stress is balanced, avoiding stress concentration and breakage.
[0046] In some possible implementations, the mating part 2 has a convex-shaped structure, including a large end 21 with an outer surface and a small end 22 connected to the large end 21 and disposed on one side of the inner surface of the large end 21. The two ends of the small end 22 along the axial direction of the shaft core 10 form an L-shaped groove 23 between the large end 21 and the large end 21.
[0047] The small end 22 is provided with a flared groove 221 on the side away from the large end 21, which is used to cooperate with the segmented bushing 20. The large end 21 of the groove 221 has an opening.
[0048] In some possible implementations, in the L-shaped groove 23 and the stress relief area 201 on the same side, the distance between the side of the small end 22 of the L-shaped groove 23 and the end face of the large end 21 on that side is A, and the distance between the side of the stress relief area 201 near the arc surface 202 and the end face of the large end 21 on that side is B, where B≥A.
[0049] This design ensures that the portion of the L-shaped groove 23 corresponding to the side along the length of the shaft core 10 will not directly contact and fit with the inner side of the keyway of the segmented bushing 20 during assembly. This prevents stress concentration at the sharp corner of the L-shaped groove 23 and avoids breakage at that location. After the wedge key 40 tightens, the arc surface 202 and the stress relief area 201 of the mating part 2 and the segmented bushing 20 will contact and fit with the inner side of the keyway on the segmented bushing 20. This ensures stress balance after the interference fit between the mating part 2 and the segmented bushing 20, preventing breakage and damage.
[0050] on the other hand,
[0051] like Figures 1-6 As shown, this utility model provides a roller shaft for use in a roller mill, including a shaft core 10, multiple sets of limiting structures arranged circumferentially along the shaft core 10 as described above, segmented bushings 20 used in conjunction with the limiting structures, and locking members 30 for locking the segmented bushings 20 and the limiting structures; the segmented bushings 20 have the same structure as the segmented bushings in Chinese Patent Application No. 2022104256149; the limiting structures are interference-fitted with the shaft core and installed in the mounting groove 101 of the shaft core 10.
[0052] In some possible implementations, the segmented bushing 20 includes a body with a keyway and a wedge key 40 disposed in the keyway and used in conjunction with the mating part 2. The wedge key 40 tightens the mating part 2 and the segmented bushing 20 to achieve an interference fit.
[0053] This invention is not limited to the specific embodiments described above. This invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.
Claims
1. A limiting structure for a segmented bushing, characterized in that, It is detachably connected to the shaft core; the shaft core is provided with a mounting groove for installing a limiting structure; the limiting structure is interference-fitted with the mounting groove; the limiting structure includes a mounting part installed in the mounting groove and a mating part provided on the mounting part and installed in conjunction with the segmented shaft sleeve; the outer side of the mating part includes two sets of stress relief zones symmetrically arranged and located at both ends of the outer side along the axial direction of the shaft core, and an abutment zone provided between the two sets of stress relief zones; the abutment zone is provided between the two sets of stress relief zones and is interconnected; the abutment zone is coplanar with the outer side of the mounting part.
2. The limiting structure for a segmented bushing according to claim 1, characterized in that, The contact area includes a contact surface and two sets of arc surfaces disposed between the contact surface and the stress relief area and connected to the ends of the contact surface and the stress relief area respectively.
3. The limiting structure for a segmented bushing according to claim 2, characterized in that, The stress relief area is a groove-shaped structure, and the vertex of the arc surface is located on the side close to the outer side of the limiting structure.
4. The limiting structure for a segmented bushing according to claim 3, characterized in that, The mating part has a convex-shaped structure, including a large end with an outer surface and a small end connected to the large end and disposed on one side of the inner surface of the large end. The two ends of the small end along the axial direction of the shaft core form an L-shaped groove with the large end. The small end is provided with a flared groove on the side away from the large end, which is used to cooperate with the segmented bushing, and the large end of the groove has an opening.
5. The limiting structure for a segmented bushing according to claim 4, characterized in that, In the L-shaped groove and stress relief area on the same side, the distance between the side of the L-shaped groove at the small end and the end face of the large end on that side is A, and the distance between the side of the stress relief area near the arc surface and the end face of the large end on that side is B, where B≥A.
6. A roller shaft, characterized in that, It includes a shaft core, a limiting structure arranged circumferentially along the shaft core and as described in any one of claims 1-5, a segmented bushing used in conjunction with a mating part in the limiting structure, and a locking member for locking the segmented bushing and the limiting structure.
7. A roller shaft according to claim 6, characterized in that, The segmented bushing includes a body with a keyway and a wedge key disposed in the keyway and used in conjunction with a mating part; the mating part is located in the keyway.