Compression roller device and dry type granulator with same

Abstract

The utility model relates to the technical field of granulation compression rollers, and discloses a compression roller device and a dry type granulator with the compression roller device, the compression roller device comprises two main shafts, the radial section of a first shaft section, suitable for being installed with a compression roller, of each main shaft is a polygon, and the side edges of each polygon are arc edges; the two compression rollers are arranged in parallel in the axial direction, shaft holes matched with the first shaft sections in shape are formed in the compression rollers, and the shaft holes of the two compression rollers are arranged on the first shaft sections in a sleeving mode respectively. According to the compression roller device provided by the utility model, the radial cross section of the first shaft section is arranged to be the polygon of which the side edges are convex outwards or concave inwards to form the arc edges and the chamfers are arranged to be the arc angles, so that the hidden danger that stress is easy to remain on the edge of a working plane of a square column section structure is effectively eliminated, and the uniformity of hardness is better; the polygonal structure changes the distribution mode of roller pressure, avoids the problems of local indentation, sunken deformation, fatigue cracking and the like caused by stress concentration under high load, remarkably prolongs the service life of equipment, and improves the production effect of the dry type granulator.

Description

Technical Field

[0001] This utility model relates to the field of granulation roller technology, specifically to a roller device and a dry granulator having the same. Background Technology

[0002] In the pharmaceutical industry, dry granulation machines are key equipment for processing active pharmaceutical ingredients and excipients. These raw materials are often fine powders with inconsistent particle size and density, poor flowability, and a tendency to stratify, making them unsuitable for direct use in subsequent processes and requiring granulation. Roller granulation, as one of the dry granulation methods, involves little or no addition of chemical substances, relying solely on mechanical extrusion and compaction to complete granulation. This ensures drug quality while reducing the risk of chemical contamination.

[0003] Dry granulation machines are classified into vertical feeding and horizontal feeding types according to the layout of the final feeding device. They mainly consist of three major mechanisms: feeding, pressure roller extrusion, and granulation. Taking the vertical feeding type as an example, the powdery material is pushed to the pressure roller extrusion mechanism by the feeding mechanism, where it is pressed into a solid cake-shaped sheet by the reverse-rotating pressure roller pair. Then, it is granulated by the granulation mechanism to produce high-quality granular finished products.

[0004] In the pressure roller extrusion mechanism, the double-section shaft-hole connected pressure roller device consists of a pressure roller and a main shaft, and generally adopts a double-section combination structure of cylindrical and square column sections. However, from the perspective of manufacturing process, this structure has shortcomings: the working plane edge of the square column section structure is prone to residual stress, and the hardness is difficult to unify; the pressure of the rollers on each working plane is uneven, with only half of the plane being linearly distributed in the normal direction. Under high load, stress concentration is easy to occur, resulting in local indentation, dent deformation, or even fatigue cracking, affecting the equipment life and granulation effect. Utility Model Content

[0005] In view of this, the present invention provides a pressure roller device and a dry granulator having the same, to solve the problems that residual stress is easy to remain on the edge of the working plane of the square column section of the pressure roller, the hardness is difficult to be uniform, and the pressure of the roller on each working plane is uneven.

[0006] In a first aspect, this utility model provides a pressure roller device, comprising:

[0007] Two main shafts are arranged parallel to each other along their axes. The radial cross-section of the first shaft section of the main shaft, which is adapted to be installed with the pressure roller, is a polygon, and the sides of the polygon are all arc edges.

[0008] Two pressure rollers are arranged parallel to each other along the axis. Each pressure roller has a shaft hole that conforms to the first shaft segment. The shaft holes of the two pressure rollers are sleeved on the first shaft segment.

[0009] Optionally, the central region of the side of the polygon is bent to form an arc edge, either close to or away from the center of the polygon.

[0010] Optionally, the central region of the side of the polygon is bent away from the center of the polygon to form multiple arc edges with different curvatures, wherein two arc edges that are spaced apart have the same curvature.

[0011] Optionally, the polygon is a triangle, the sides of the triangle are convex to form arc edges, and the three vertices are chamfered to form rounded corners. The curvature of the arc edges is greater than the curvature of the rounded corners, and the connection between the arc edges and the rounded corners is smoothly transitioned by an arc.

[0012] Optionally, the central region of the side of the polygon is bent near the center of the polygon to form multiple arc edges with different curvatures, wherein two arc edges that are spaced apart have the same curvature.

[0013] Optionally, the central region of one side of the polygon bends near the center of the polygon to form a first arc edge, and the central region of the other side of the adjacent polygon bends away from the center of the polygon to form a second arc edge, with the first and second arc edges alternately arranged.

[0014] Optionally, the main shaft is provided with a shoulder portion, and when the pressure roller is installed on the main shaft, the end face of the pressure roller abuts against the shoulder portion.

[0015] Optionally, the contact surface between the shoulder and the end face of the pressure roller is an annular surface.

[0016] Beneficial effects

[0017] The pressure roller device provided by this utility model includes two main shafts arranged parallel to each other axially. The radial cross-section of the first shaft section of the main shaft, which is adapted to be installed with the pressure rollers, is polygonal, and the sides of the polygon are arc-shaped. The two pressure rollers are arranged parallel to each other axially, and the pressure rollers are provided with shaft holes that conformally fit the first shaft section. The shaft holes of the two pressure rollers are sleeved on the first shaft section. By setting the radial cross-section of the first shaft section of the main shaft to a polygon with convex or concave sides forming arc edges and rounded corners, the hidden danger of residual stress at the edge of the working plane of the square column structure is effectively eliminated, resulting in better uniformity of hardness. At the same time, the polygonal structure changes the distribution pattern of roller pressure. Compared with the traditional structure, each working plane can bear the pressure of the pressure roller more evenly, avoiding problems such as local indentation, dent deformation and fatigue cracking caused by stress concentration under high load, significantly extending the service life of the equipment and improving the production effect of the dry granulation machine.

[0018] Secondly, this utility model also provides a dry granulation machine, comprising:

[0019] The pressure roller device described in any of the preceding descriptions. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a side view of a pressure roller device according to an embodiment of the present utility model;

[0022] Figure 2 for Figure 1 The diagram shows the cross-section at point AA.

[0023] Figure 3 This is a schematic diagram of the force on the first shaft segment according to an embodiment of the present invention;

[0024] Figure 4 This is a cross-sectional schematic diagram of the main shaft according to an embodiment of the present utility model;

[0025] Figure 5 This is a cross-sectional schematic diagram of the pressure roller according to an embodiment of the present invention;

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Main shaft; 11. First shaft section; 12. Shaft shoulder; 2. Pressure roller; 21. Shaft hole; 22. Working surface. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] The following is combined with Figures 1 to 5 The following describes embodiments of the present invention.

[0030] According to an embodiment of the present invention, in one aspect, a pressure roller device is provided, comprising:

[0031] Two main shafts 1 are arranged parallel to each other along the axis. The radial cross section of the first shaft segment 11 of the main shaft 1, which is adapted to be installed with the pressure roller 2, is a polygon, and the sides of the polygon are all arc edges.

[0032] Two pressure rollers 2 are arranged parallel to each other along the axis. The pressure rollers 2 are provided with shaft holes 21 that conform to the first shaft section 11. The shaft holes 21 of the two pressure rollers 2 are fitted onto the first shaft section 11.

[0033] Specifically, the circumferential surfaces of the two pressure rollers 2 form a working surface 22.

[0034] It should be noted that the two pressure rollers 2 are provided with shaft holes 21 that conformally fit the main shaft 1, ensuring a tight connection between the pressure rollers 2 and the main shaft 1, and enabling them to accurately follow the rotation of the main shaft 1. When working in conjunction with the main shaft 1, the pressure rollers 2 can efficiently convert the power transmitted by the main shaft 1 into pressing force on the material. In addition, the conformally fitted shaft hole 21 design reduces the shaking of the pressure rollers 2 during operation, further improving the stability of the entire pressure roller device and ensuring the continuity and efficiency of the granulation process.

[0035] The pressure roller device provided by this utility model includes two main shafts 1 arranged parallel to each other axially. The radial cross section of the first shaft segment 11 of the main shaft 1, which is adapted to be installed with the pressure roller 2, is polygonal, and the sides of the polygon are arc edges. The two pressure rollers 2 are arranged parallel to each other axially. The pressure rollers 2 are provided with shaft holes 21 that conformally fit the first shaft segment 11. The shaft holes 21 of the two pressure rollers 2 are sleeved on the first shaft segment 11. By setting the radial cross section of the first shaft segment 11 of the main shaft to be a polygon with convex or concave sides forming arc edges and chamfered into rounded corners, the hidden danger of residual stress at the edge of the working plane of the square column structure is effectively eliminated, resulting in better uniformity of hardness. At the same time, the polygonal structure changes the distribution pattern of roller pressure. Compared with the traditional structure, each working plane can bear the pressure of the pressure roller more evenly, avoiding problems such as local indentation, dent deformation and fatigue cracking caused by stress concentration under high load, significantly extending the service life of the equipment and improving the production effect of the dry granulation machine.

[0036] Furthermore, the central region of the side of the polygon bends near or away from the center of the polygon to form an arc edge.

[0037] It should be noted that the spindle 1 can be made of high-strength metal material, and the first shaft section 11 of the spindle 1 is machined with high precision using CNC machine tools and other equipment. The central area of ​​the polygonal side is set to form an arc edge according to the design requirements. At the same time, the shaft hole 21 of the pressure roller 2 is manufactured to fit the spindle 1. Finally, the shaft hole 21 of the pressure roller 2 is fitted onto the first shaft section 11 of the spindle 1 to complete the assembly.

[0038] As is easily understood, by bending the central area of ​​the polygonal side to form an arc edge, the stress points at the edge of the traditional structure are effectively eliminated, avoiding deformation and cracking caused by stress concentration, and extending the service life of the equipment; at the same time, the roller pressure distribution is more uniform, improving the granulation quality, and also helping to ensure the uniform hardness of the pressure roller 2, ensuring the stable operation of the dry granulation machine and the quality of drug production.

[0039] It should be noted that the central region of the polygonal side refers to the area near the midpoint of the line connecting the two ends of the side along its length. This region serves as the reference point for forming the curved edge. Its extent is generally determined based on actual machining accuracy and mechanical performance requirements, typically occupying one-third to one-half of the side length. Bending towards or away from the polygon's center is performed within this region, creating an alternating curved edge structure to optimize stress distribution and roller pressure transmission. Furthermore, in addition to the central region, the two outer edges are also bent to a certain extent to achieve the curved shape of the polygonal side.

[0040] Furthermore, the central region of the side of the polygon bends away from the center of the polygon to form multiple curved edges with different curvatures, wherein two curved edges that are spaced apart have the same curvature.

[0041] It is easy to understand that adopting a structure in which the central area of ​​the polygonal side bends away from the center and the arcs of the spaced arcs have the same curvature can more efficiently disperse stress. Compared with a single arc, the combination of multiple arcs with different curvatures can adapt to roller pressures of different directions and magnitudes, avoid stress concentration, and reduce local deformation and fatigue cracking. The design with the same curvature makes the roller pressure distribution more scientific, ensuring that the material is subjected to consistent force, significantly improving the uniformity of granulation and the quality of the finished product, while optimizing the hardness consistency of the pressure rollers and extending the overall service life of the equipment.

[0042] Furthermore, the polygon is a triangle, with the sides of the triangle convex to form arc edges, and the three vertices are chamfered to form rounded corners. The curvature of the arc edges is greater than that of the rounded corners, and the connection between the arc edges and the rounded corners is smoothly transitioned by an arc.

[0043] It should be noted that the triangular main shaft 1, with its convex sides forming arc edges and rounded corners, provides more stable and efficient torque transmission during the transmission process. Compared to conventional structures, this effectively reduces power transmission losses and ensures the stability of equipment operation. The convex arc edges and rounded corners enhance the structural strength of the main shaft 1, preventing stress concentration under high loads and effectively extending its service life. Furthermore, this design makes the main shaft 1 operate more smoothly, reducing vibration and noise, further improving the overall performance of the dry granulator and ensuring the continuity and efficiency of granulation operations.

[0044] Of course, in some alternative embodiments, the polygon shape can be set to quadrilateral, pentagon, or have more edges.

[0045] Furthermore, the central region of the side of the polygon bends near the center of the polygon to form multiple curved edges with different curvatures, wherein two curved edges that are spaced apart have the same curvature.

[0046] It should be noted that bending the central area of ​​the polygonal side towards the center forms multiple arc edges with different curvatures and equal intervals. This structure can effectively disperse stress by using different curvatures, prevent stress concentration, and reduce component deformation and cracking. The design with equal intervals of curvature can ensure uniform distribution of roller pressure, make the material subjected to force evenly, improve the uniformity and quality of granulation, and at the same time enhance the consistency of the hardness of the pressure roller 2, thereby improving the overall performance and service life of the pressure roller device.

[0047] Furthermore, the central region of one side of the polygon bends close to the center of the polygon to form a first arc edge, and the central region of the other side of the adjacent polygon bends away from the center of the polygon to form a second arc edge, with the first and second arc edges being alternately arranged.

[0048] Preferably, the number of sides of the polygon is limited to an even number to ensure the transmission effect of the pressure roller 2. Of course, in an optional embodiment, the number of sides of the polygon can also be limited to an odd number. Taking a triangle as an example, two sides are convex and one side is concave.

[0049] It should be noted that the polygonal side adopts an alternating structure of a first arc edge (bending towards the center) and a second arc edge (bending away from the center). This unique design can effectively disperse the roller pressure through the arc edges in different directions, breaking the drawback of stress concentration in traditional structures and reducing the risk of local deformation and fatigue cracking of the pressure roller 2. The alternating arrangement makes the roller pressure more evenly distributed on each working plane, ensuring that the material is subjected to uniform force during the granulation process, thereby improving the quality and stability of the finished granules. At the same time, it also helps to achieve uniform hardness of the pressure roller 2, enhancing the overall performance and durability of the pressure roller device.

[0050] Optionally, the main shaft 1 is provided with a shoulder 12, and when the pressure roller 2 is installed on the main shaft 1, the end face of the pressure roller 2 abuts against the shoulder 12.

[0051] It should be noted that the pressure roller 2 is installed at one end of the main shaft 1. The cross-section of the other shaft ends of the main shaft 1 away from the section where the pressure roller 2 is installed can be set to other shapes according to production needs. For example, it can be set to a circle at the shoulder near the pressure roller 2. First, the circular cross-section is easier to process during production; second, a sealing ring can be set at this location to achieve a good seal in this area. The presence of the sealing ring can effectively prevent material dust and external impurities from entering the connection between the main shaft 1 and other components, preventing problems such as component wear and corrosion caused by impurities, and extending the service life of key components of the equipment.

[0052] It is easy to understand that the shoulder 12 establishes a clear and stable mounting reference surface for the pressure roller 2 on the main shaft 1. When the end face of the pressure roller 2 is in close contact with the shoulder 12, the axial position coordinates of the pressure roller 2 can be accurately determined, ensuring the height consistency of the installation position of the pressure roller 2.

[0053] Furthermore, the contact surface between the shoulder 12 and the end face of the pressure roller 2 is an annular surface.

[0054] It should be noted that the cylindrical section of the shoulder 12 is symmetrical about the axis to facilitate the installation of related components.

[0055] According to an embodiment of the present invention, in another aspect, a dry granulation machine is provided, comprising:

[0056] The pressure roller device as described in any of the above descriptions.

[0057] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A pressure roller device, characterized in that, include: Two main shafts (1) are arranged parallel to each other along their axes. The radial cross section of the first shaft segment (11) of the main shaft (1) adapted to be installed with the pressure roller (2) is a polygon, and the sides of the polygon are all arc edges. Two pressure rollers (2) are arranged parallel to each other along the axis. The pressure rollers (2) are provided with shaft holes (21) that conform to the first shaft segment (11). The shaft holes (21) of the two pressure rollers (2) are respectively sleeved on the first shaft segment (11).

2. The pressure roller device according to claim 1, characterized in that, The central region of the side of the polygon bends to form an arc edge, either close to or away from the center of the polygon.

3. The pressure roller device according to claim 2, characterized in that, The central region of the side of the polygon bends away from the center of the polygon to form multiple curved edges with different curvatures, wherein two curved edges that are spaced apart have the same curvature.

4. The pressure roller device according to claim 3, characterized in that, The polygon is a triangle with convex sides forming arc edges and chamfered corners forming rounded corners. The arc of the arc edge is greater than the arc of the rounded corner, and the connection between the arc edge and the rounded corner is smoothly transitioned by an arc.

5. The pressure roller device according to claim 2, characterized in that, The central region of the side of the polygon bends near the center of the polygon to form multiple curved edges with different curvatures, wherein two curved edges that are spaced apart have the same curvature.

6. The pressure roller device according to claim 2, characterized in that, One side of the polygon bends near the center of the polygon to form a first arc edge, and the other side of the adjacent polygon bends away from the center of the polygon to form a second arc edge. The first and second arc edges are alternately arranged.

7. The pressure roller device according to any one of claims 1-6, characterized in that, The main shaft (1) is provided with a shoulder (12). When the pressure roller (2) is installed on the main shaft (1), the end face of the pressure roller (2) abuts against the shoulder (12).

8. The pressure roller device according to claim 7, characterized in that, The contact surface between the shoulder (12) and the end face of the pressure roller (2) is an annular surface.

9. A dry granulation machine, characterized in that, include: The pressure roller device according to any one of claims 1 to 8.

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