A pressure roller structure for a granulator

Abstract

This utility model relates to the field of powder granulation machine technology, and provides a pressure roller structure for a granulator. The pressure roller structure includes a roller seat connected to the machine bed, a roller shaft pivotally connected to the roller seat, a pressure roller sleeved on the roller shaft, and a lock nut screwed to the end of the roller shaft. The lock nut is used to limit the displacement of the pressure roller along the axial direction of the roller shaft. The roller shaft has a polygonal boss, and the end of the pressure roller near the lock nut has a insertion hole, which is adapted to the boss. The boss has at least six sides. Compared with the prior art, this utility model adds more than six support points, which refines and reduces the radial force distribution, effectively reducing single-point stress concentration. This not only improves the torque transmission frequency and reduces harmonic vibration during transmission, but also significantly reduces the torque borne by each contact surface, reducing contact surface crushing and extending the service life of the connection between the roller shaft and the pressure roller.

Description

Technical Field

[0001] This utility model relates to the field of powder granulation machine technology, and in particular to a pressure roller structure for a granulator. Background Technology

[0002] Existing powder granules are usually prepared using dry granulation machines. The process mainly involves mixing raw materials and then feeding them evenly into the compression zone of the machine through a pre-feeder. The materials are then extruded by two opposing rollers, forming dense flakes under the action of the rollers. The flakes are then separated from the roller surface by a scraper and enter a crushing and granulating machine. After passing through a vibrating screen, particles of the required particle size are screened out. The remaining material is sent back to the raw material silo by existing conveying methods such as pneumatic conveying to repress the flakes, thus achieving cyclical preparation.

[0003] In particular, when the mixed powder enters the triangular area of ​​the double pressure rollers for extrusion, if the powder has uneven flowability or fluctuates in the feed, it will cause a sudden increase in the extrusion torque, resulting in excessive extrusion load torque and causing crushing failure at the connection between the polygonal bosses of the pressure roller and the roller shaft. Utility Model Content

[0004] In view of this, the present invention aims to propose a pressure roller structure for a granulator, which avoids a significant increase in local stress, improves the existing technology that causes breakage at the connection of the pressure roller or roller shaft, and ensures the smooth implementation of the extrusion process.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A pressure roller structure for a granulator includes a roller shaft pivotally connected to a roller seat, a pressure roller sleeved on the roller shaft, and a lock nut screwed to the end of the roller shaft. The lock nut is used to limit the displacement of the pressure roller along the axial direction of the roller shaft; The roller shaft is provided with a polygonal boss, and the end of the pressure roller near the lock nut is provided with an insertion hole, which is adapted to the boss. The boss has no fewer than six sides.

[0006] Furthermore, the boss is formed in a hexagonal shape, and the insertion hole is formed in a hexagonal through hole.

[0007] Furthermore, the edge of the boss is provided with an arc-shaped portion, which is formed at the corner of the boss.

[0008] Furthermore, the roller shaft is also provided with a cylindrical section that connects with the boss, and the pressure roller is provided with a sleeve hole, the cylindrical section and the sleeve hole are connected in cooperation; The diameter of the sleeve hole is larger than the maximum inner diameter of the insertion hole, and the pressure roller abuts against the end of the boss.

[0009] Furthermore, a pressure cover is provided between the pressure roller and the lock nut, and a relief groove is provided on the side of the pressure cover near the cylindrical section, the diameter of the relief groove being larger than the diameter of the cylindrical section; The pressure cap is also provided with a first annular ring, which is located between the pressure roller and the pressure cap.

[0010] Furthermore, a second annular ring is provided between the pressure roller and the cylindrical section, with two second annular rings respectively located at both ends of the pressure roller, and the opening groove located between the two second annular rings.

[0011] Furthermore, a first bearing assembly and a second bearing assembly are provided between the roller shaft and the roller seat, with the first bearing assembly and the second bearing assembly respectively located at both ends of the roller seat.

[0012] Furthermore, a sleeve is connected to the roller shaft, a fixed seat is provided on the roller seat, and a sealing assembly is provided between the fixed seat and the sleeve.

[0013] Furthermore, the fixing seat includes a disc and a pressure seat respectively disposed on both sides of the bed, and the sealing assembly includes a first sealing ring disposed between the disc and the sleeve, and a second sealing ring disposed between the pressure seat and the sleeve. A third annular ring is also provided between the sleeve and the roller.

[0014] Compared with the prior art, this utility model has the following advantages: The granulator roller structure described in this utility model features a boss on the roller shaft and an insertion hole in the roller for engaging with the boss. The boss has at least six sides, which adds more than six support points compared to the prior art. This reduces the radial force dispersion, effectively lowers stress concentration at single points, improves the torque transmission frequency, reduces harmonic vibrations during transmission, and significantly reduces the torque borne by each contact surface, thus extending the lifespan of the connection between the roller shaft and the roller. Attached Figure Description

[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the connection between the pressure roller structure of the granulator, the roller seat, and the drive wheel as described in this embodiment of the utility model. Figure 2 This is a three-dimensional schematic diagram of the pressure roller structure for a granulator according to an embodiment of the present invention; Figure 3This is a top view of the granulator pressure roller structure excluding the pressure cap according to an embodiment of the present invention; Figure 4 This is a three-dimensional schematic diagram of the granulator pressure roller structure described in this embodiment of the utility model, excluding the pressure cap and lock nut; Figure 5 This is a three-dimensional schematic diagram of the roller shaft described in an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached figures: 1. Roller shaft; 2. Pressure roller; 3. Lock nut; 4. Roller seat; 5. Bed; 6. Pressure cover; 7. First annular ring; 8. Second annular ring; 9. First bearing assembly; 10. Second bearing assembly; 11. Sleeve; 12. Fixed seat; 13. First sealing ring; 14. Second sealing ring; 15. Third annular ring; 16. Drive wheel; 101. Boss; 102. Cylindrical section; 103. Cooling hole; 104. Connecting hole; 201. Socket; 202. Sleeve; 601. Clearance groove; 1011. Arc-shaped part; 1201, disc; 1202, pressure seat; 1203, oil drain hole; 2021, Opening groove. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "back," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] This embodiment relates to a pressure roller structure for a granulator, which, as a whole, is as follows: Figure 1 As shown, the pressure roller 2 structure includes a roller shaft 1 pivotally connected to a roller seat 4, a pressure roller 2 sleeved on the roller shaft 1, and a lock nut 3 screwed to the end of the roller shaft 1. The lock nut 3 is used to limit the displacement of the pressure roller 2 along the axial direction of the roller shaft 1. The roller shaft 1 is provided with a polygonal boss 101. The end of the pressure roller 2 near the lock nut 3 is provided with an insertion hole 201, which is adapted to the boss 101. The boss 101 has not less than six sides.

[0022] Based on the above design concept, the granulator pressure roller structure of this embodiment has a boss 101 on the roller shaft 1 and an insertion hole 201 in the pressure roller 2 to be inserted into the boss 101. The boss 101 has no less than six sides, which increases the support structure by more than six points compared with the prior art. This makes the radial force dispersion more refined and reduces the stress concentration at a single point. It not only improves the torque transmission frequency and reduces harmonic vibration during transmission, but also greatly reduces the torque borne by each contact surface, and extends the service life of the connection between the roller shaft 1 and the pressure roller 2.

[0023] Based on the above overall introduction, this embodiment presents an exemplary structure of the pressure roller for a granulator, such as... Figures 1 to 4 As shown, the roller seat 4 is connected to the bed 5 of the granulator frame, and the roller shaft 1 is inserted into the inner hole of the roller seat 4. The roller shaft 1 is provided with a drive wheel 16 at one end of the pressure roller 2. When the reduction motor drives the drive wheel 16 to rotate, the roller shaft 1 and the pressure roller 2 rotate relative to the roller seat 4. The drive structure of the drive wheel 16 and the reduction motor refers to the prior art and will not be described in detail here.

[0024] In one preferred embodiment, the boss 101 is formed into a hexagon, and the insertion hole 201 is formed into a hexagonal through hole. The hexagonal roller shaft 1 and pressure roller 2 are connected, creating a six-point support structure at the connection point. This optimizes the radial force distribution from the existing 90° interval to a 60° interval, effectively reducing single-point stress concentration. Furthermore, the cubic fit significantly reduces the roller surface sway, with a dynamic balance amplitude ≤0.015mm.

[0025] In this embodiment, the static torque distribution can be achieved through the above configuration. The configuration structure of the hexagonal boss 101 and the socket 201 increases the torque transmission contact surface by 50%, and reduces the torque borne by a single tooth surface to T / 6, where T is the total torque, so as to significantly reduce contact stress and avoid local breakage at the connection between the socket 201 and the boss 101.

[0026] Furthermore, the dynamic torque fluctuation coefficient is reduced by adopting a hexagonal fit, and the instantaneous overload bearing capacity is increased to 300% of the rated torque, while the existing four-sided structure has a rated torque of 220%. Therefore, the transmission efficiency is further improved, which can ensure the extrusion effect on powder while avoiding local failure of roller 1 or pressure roller 2.

[0027] Furthermore, when one side of the contact fails, the remaining five contact surfaces of the hexagonal structure can still maintain 83% of the torque transmission capacity, while the existing square structure only retains 75% after failure, significantly improving the system robustness.

[0028] Preferably, such as Figures 3 to 5 As shown, the boss 101 has an arc-shaped portion 1011 at its edge, which is formed at the corner of the boss 101. This design further reduces the localized stress surge at the corner of the boss 101, significantly delays the initiation of fatigue cracks, and makes the stress distribution more uniform. Simultaneously, the arc-shaped structure of the arc-shaped portion 1011 absorbs impact energy, significantly improving the instantaneous overload capacity compared to a sharp-corner structure, making it suitable for extruding powders of varying viscosities. Furthermore, it reduces the difficulty of precision assembly and minimizes the problem of uneven roller surface pressure caused by installation errors.

[0029] Furthermore, such as Figure 1 As shown, the roller shaft 1 is also provided with a cylindrical section 102 that connects to the boss 101. The pressure roller 2 is provided with a sleeve hole 202. The cylindrical section 102 and the sleeve hole 202 are fitted together. The diameter of the sleeve hole 202 is larger than the maximum inner diameter of the insertion hole 201. The pressure roller 2 abuts against the end of the boss 101. During installation, the pressure roller 2 is sleeved on the roller shaft 1. It is positioned by abutting against the end of the boss 101. The sleeve hole 202 is sleeved on the cylindrical section 102, and the insertion hole 201 is inserted into the boss 101, thus achieving the purpose of the roller shaft 1 driving the pressure roller 2 to rotate. Figure 1 As shown, the axial lengths of the boss 101 and the insertion hole 201 are equal, and the thickness of the boss 101 is less than the thickness of the pressure roller 2, which reduces the installation difficulty of the pressure roller 2 and the roller shaft 1.

[0030] Still Figure 1 As shown, a pressure cover 6 is also provided between the pressure roller 2 and the lock nut 3. A clearance groove 601 is provided on the side of the pressure cover 6 near the cylindrical section 102. The diameter of the clearance groove 601 is larger than the diameter of the cylindrical section 102. A first annular ring 7 is also provided on the pressure cover 6, located between the pressure roller 2 and the pressure cover 6. In this embodiment, the clearance groove 601 is a circular blind hole. The pressure cover 6 abuts against the end of the pressure roller 2, and the clearance groove 601 is provided in the middle. When the lock nut 3 is tightened, the elastic pressure of the pressure cover 6 increases the locking effect on the pressure roller 2, ensuring the integrity of the connection between the pressure roller 2 and the roller shaft 1.

[0031] In addition, such as Figure 1As shown, the roller 1 has a cooling hole 103 arranged axially in the middle, and a connecting hole 104 arranged radially on the roller 1. Two spaced connecting holes 104 communicate with the cooling hole 103. A spirally arranged opening groove 2021 is formed in the sleeve hole 202, and the opening grooves 2021 at both ends communicate with the two connecting holes 104 respectively. A cooling pipe and a plug sleeved on the outside of the cooling pipe are provided in the cooling hole 103. The outer diameter of the plug is adapted to the inner diameter of the cooling hole. One end of the cooling pipe is connected to the external refrigeration equipment, and the other end is located between the two connecting holes 104. Cooling water is sent to the bottom of the cooling hole 103, enters the opening groove 2021 through one of the connecting holes 104, flows along the axial direction of the pressure roller to the other end of the opening groove 2021, and flows back to the cooling hole 103 through the other connecting hole 104, realizing real-time circulating cooling of the pressure roller 2 and ensuring that no chemical change occurs during the extrusion of powder.

[0032] Furthermore, such as Figure 1 As shown, a second annular ring 8 is also provided between the pressure roller 2 and the cylindrical section 102. Two second annular rings 8 are respectively located at both ends of the pressure roller 2, and the opening groove 2021 is located between the two second annular rings 8. The second annular rings 8 are used to seal both ends of the opening groove 2021 to prevent the cooling medium from flowing out. Both the first annular ring 7 and the second annular ring 8 are rubber sealing rings.

[0033] Continue as Figure 1 As shown, a first bearing assembly 9 and a second bearing assembly 10 are provided between the roller shaft 1 and the roller seat 4, with the first bearing assembly 9 and the second bearing assembly 10 respectively located at both ends of the roller seat 4. The first bearing assembly 9 uses roller bearings, and the second bearing assembly 10 uses deep groove ball bearings. The second bearing assembly 10 is located close to the aforementioned drive wheel 16.

[0034] As a possible implementation method, such as Figure 1 As shown, a sleeve 11 is also connected to the roller shaft 1, and a fixed seat 12 is provided on the roller seat 4. A sealing assembly is provided between the fixed seat 12 and the sleeve 11. The sleeve 11 is fixed to the roller shaft 1 by a key connection. When the roller shaft 1 rotates, the sleeve 11 rotates relative to the fixed seat 12.

[0035] Preferably, as Figure 1 As shown, the fixed base 12 includes a disc 1201 and a pressure seat 1202 respectively disposed on both sides of the bed 5. The sealing assembly includes a first sealing ring 13 disposed between the disc 1201 and the sleeve 11, and a second sealing ring 14 disposed between the pressure seat 1202 and the sleeve 11. A third annular ring 15 is also provided between the sleeve 11 and the roller 1. This arrangement facilitates the installation of the roller 1 and the roller seat 4 with the bed 5. The first sealing ring 13 and the second sealing ring 14 prevent impurities from entering between the fixed base 12 and the sleeve 11, ensuring smooth rotation. The third annular ring 15 further prevents the cooling medium from flowing to the sleeve 11.

[0036] In addition, such as Figure 1 As shown, the disc 1201 of this embodiment is provided with radially arranged oil drain holes 1203. The oil drain holes extend into the space where the first sealing ring 13 is installed. When the first sealing ring 13 fails, the lubricating oil in the bearing can be discharged through the oil drain holes 1203 to effectively prevent the lubricating oil from flowing to the pressure roller 2, avoid contaminating the extruded powder, and ensure the performance of the pressure roller assembly for the granulator.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure roller structure for a granulator, characterized in that: It includes a roller shaft (1) pivotally connected to the roller seat (4), a pressure roller (2) sleeved on the roller shaft (1), and a lock nut (3) screwed to the end of the roller shaft (1); The lock nut (3) is used to limit the displacement of the pressure roller (2) along the axial direction of the roller shaft (1); The roller (1) is provided with a polygonal boss (101), and the pressure roller (2) is provided with an insertion hole (201) at one end near the lock nut (3), and the insertion hole (201) is adapted to the boss (101); The boss (101) has no fewer than six sides.

2. The pressure roller structure for a granulator according to claim 1, characterized in that: The boss (101) is formed in a hexagonal shape, and the insertion hole (201) is formed in a hexagonal through hole.

3. The granulator roller structure according to claim 2, characterized in that: The boss (101) has an arc-shaped portion (1011) at its edge, and the arc-shaped portion (1011) is formed at the corner of the boss (101).

4. The granulator roller structure according to claim 3, characterized in that: The roller (1) is also provided with a cylindrical section (102) that connects with the boss (101), and the pressure roller (2) is provided with a sleeve hole (202), and the cylindrical section (102) is connected to the sleeve hole (202); The diameter of the sleeve hole (202) is greater than the maximum inner diameter of the insertion hole (201), and the pressure roller (2) abuts against the end of the boss (101).

5. The granulator roller structure according to claim 4, characterized in that: A pressure cover (6) is also provided between the pressure roller (2) and the lock nut (3). The pressure cover (6) has a relief groove (601) on the side near the cylindrical section (102). The diameter of the relief groove (601) is larger than the diameter of the cylindrical section (102). The pressure cap (6) is also provided with a first annular ring (7), which is located between the pressure roller (2) and the pressure cap (6).

6. The granulator roller structure according to claim 5, characterized in that: A second annular ring (8) is provided between the pressure roller (2) and the cylindrical section (102). The two second annular rings (8) are respectively located at both ends of the pressure roller (2), and the opening groove (2021) is located between the two second annular rings (8).

7. The pressure roller structure for a granulator according to claim 1, characterized in that: A first bearing group (9) and a second bearing group (10) are provided between the roller shaft (1) and the roller seat (4), and the first bearing group (9) and the second bearing group (10) are respectively located at both ends of the roller seat (4).

8. The pressure roller structure for a granulator according to claim 1, characterized in that: A sleeve (11) is also connected to the roller (1), and a fixed seat (12) is provided on the roller seat (4). A sealing component is provided between the fixed seat (12) and the sleeve (11).

9. The pressure roller structure for a granulator according to claim 8, characterized in that: The fixed seat (12) includes a disc (1201) and a pressure seat (1202) respectively disposed on both sides of the bed (5). The sealing assembly includes a first sealing ring (13) disposed between the disc (1201) and the sleeve (11), and a second sealing ring (14) disposed between the pressure seat (1202) and the sleeve (11). A third annular ring (15) is also provided between the sleeve (11) and the roller (1).

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