Speed reducer for sliding bearing multi-branch planetary roller press

Abstract

The utility model discloses a speed reducer for a sliding bearing multi-branch planetary roller press, which relates to the technical field of roller press speed reducers and comprises an input shaft meshed with a driven bull gear, a first-stage sun gear and a first-stage planet gear which are meshed with each other are sleeved in the driven bull gear, and the first-stage planet gear is connected with a first-stage planet carrier. The first-stage planet carrier is arranged in an inner cavity of the second-stage sun gear in a penetrating mode, the periphery of the second-stage sun gear is meshed with a second-stage planet gear, and the second-stage planet gear drives the second-stage planet carrier to rotate. A first ring table is arranged on the periphery of the first-stage sun gear, a second ring table is arranged in an inner cavity of the second-stage sun gear, and a first-stage limiting piece and a second-stage limiting piece are connected to a port of the large driven gear and a port of the second-stage sun gear correspondingly. The bearing capacity and the service life of a planet wheel are influenced, and under the condition that a rolling bearing is adopted, the planet-level shunting number of the speed reducer for the roller press cannot be increased.

Description

Technical Field

[0001] This utility model relates to the field of roller press reducer technology, and in particular to a reducer for a multi-star roller press with sliding bearings. Background Technology

[0002] Roller presses, as energy-saving and efficient grinding equipment, have broad market prospects. A roller press consists of a fixed roller and a movable roller, crushing materials through extrusion. Each roller press requires a reducer transmission system. The reducer is the main transmission equipment and a core component of the roller press; its reliability determines whether the roller press can operate normally. Existing roller press reducers use standard rolling bearings in their planetary gear segments. Disassembling the bearings easily damages the mating parts, resulting in poor maintainability. Furthermore, the meshing process of the planetary gears generates significant stress on their inner walls, reducing their service life. Additionally, the relatively large diameter of rolling bearings limits the number of flow dividers in the planetary gear segment. Using sliding bearings can significantly increase the number of flow dividers in the reducer's planetary gear segment, reduce the size and weight of the reducer, and increase its overall power density.

[0003] In summary, developing a high-power-density, high-reliability, and easy-to-maintain reducer for planetary roller presses is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a reducer for multi-star roller presses with sliding bearings, which solves the technical problems of low power density, poor operational reliability and poor maintainability of existing reducers for roller presses.

[0005] To achieve the above objectives, this utility model provides a roller press reducer, comprising:

[0006] An input shaft has a driven large gear meshing at its end. A first-stage sun gear is housed inside the driven large gear. A first-stage planet gear meshes at the end of the first-stage sun gear away from the input shaft. The first-stage planet gear is connected to a first-stage planet carrier. A drive shaft extends from the first-stage planet carrier away from the driven large gear and passes through the inner cavity of a second-stage sun gear. A second-stage planet gear meshes on the outer circumference of the second-stage sun gear. The second-stage planet gear is connected to a second-stage planet carrier and drives the second-stage planet carrier to rotate.

[0007] The first-stage sun gear has a first ring platform extending from its outer periphery, and the second-stage sun gear has a second ring platform extending from its inner cavity. The driven large gear and the port of the second-stage sun gear are respectively connected to the first-stage limiting member and the second-stage limiting member. The first-stage limiting member and the port of the driven large gear clamp the first-stage sun gear, and the second-stage limiting member and the drive shaft clamp the second-stage sun gear.

[0008] Preferably, the first-stage planetary gear is connected to the first-stage planetary carrier via a first-stage high-specific-pressure sliding bearing, and the second-stage planetary gear is connected to the second-stage planetary carrier via a second-stage high-specific-pressure sliding bearing. A first-stage axial limiting thrust bearing and a second-stage axial limiting thrust bearing are respectively provided between the two end faces of the first-stage planetary gear and the inner walls of the two sides of the first-stage planetary carrier, and between the two end faces of the second-stage planetary gear and the inner walls of the two sides of the second-stage planetary carrier.

[0009] Preferably, rolling bearings are fitted on both sides of the input shaft, driven large gear, first-stage planetary carrier, and second-stage planetary carrier gears.

[0010] Preferably, the rolling bearings at both ends of the input shaft and the driven large gear are fixed on the inner walls of the first housing and the second housing, respectively; the rolling bearings at both ends of the first-stage planetary carrier are fixed on the inner walls of the second housing and the third housing, respectively; and the rolling bearings at both ends of the second-stage planetary carrier are fixed on the third housing and the fourth housing.

[0011] Preferably, an oil reservoir ring is fitted around the outer periphery of the drive shaft, and a locking ring is provided around the outer periphery of the oil reservoir ring. The locking ring is clamped between the third housing and the second-stage planetary carrier. A first oil reservoir and a second oil reservoir are respectively provided on the inner and outer walls of the oil reservoir ring. The first oil reservoir is used to provide lubricating oil for the first-stage planetary gear, and the second oil reservoir is used to provide lubricating oil for the second-stage planetary gear.

[0012] Preferably, each of the first-stage high-specific-pressure sliding bearings and the second-stage high-specific-pressure sliding bearings is fixed to the first-stage planetary carrier and the second-stage planetary carrier by an interference fit.

[0013] Preferably, the first-stage planetary carrier and the second-stage planetary carrier are respectively provided with a first-stage internal gear ring and a second-stage internal gear ring that mesh with the first-stage planetary gear and the second-stage planetary gear; the number of first-stage planetary gears is not less than 3 and the number of second-stage planetary gears is not less than 5.

[0014] Preferably, both the first-level limiting member and the second-level limiting member are specifically ring-shaped. The first-level limiting member extends towards the side closer to the first-level sun gear with a first-level limiting ring, and the second-level limiting member extends away from the side of the second-level sun gear with a second-level limiting ring.

[0015] Preferably, the input shaft is provided with a keyway, which engages with the drive motor, and the end of the second-stage planetary carrier opposite to the first-stage planetary carrier is connected to the roller press via a locking disc.

[0016] Compared to the aforementioned background technology, the reducer for a multi-stage planetary roller press with sliding bearings provided by this utility model includes: an input shaft that meshes with a driven large gear, driving the driven large gear to rotate; a first-stage sun gear housed inside the driven large gear, rotating coaxially with the driven large gear; a first ring platform on the outer circumference of the first-stage sun gear; a first-stage limiting member connected to the end of the driven large gear; the first-stage limiting member and the end face of the driven large gear clamping the first ring platform, restricting the axial degree of freedom of the first-stage sun gear; and the first-stage limiting member offsets the axial stress generated by the first-stage planetary gears. A first-stage planetary gear meshes with the outer circumference of the end of the first-stage sun gear facing away from the driven large gear. Connected to the first-stage planetary carrier, the first-stage planetary carrier extends a drive shaft along the axis of the first-stage sun gear towards the end opposite to the driven large gear. A second-stage sun gear is fitted around the outer circumference of the drive shaft. The second-stage sun gear moves coaxially with the drive shaft. The inner cavity of the second-stage sun gear, which accommodates the drive shaft, is provided with a second annular platform. A second-stage limiting member is provided at the end of the second-stage sun gear. The second-stage limiting member and the end of the drive shaft clamp the second annular platform, restricting the axial degree of freedom of the second-stage sun gear and counteracting the axial stress applied by the second-stage planetary gears. A second-stage planetary gear is provided around the outer circumference of the second-stage sun gear. The second-stage planetary gear is connected to the second-stage planetary carrier and drives the second-stage planetary carrier to rotate. The output end of the second-stage planetary carrier is connected to the roller press. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 The sliding bearing multi-stage star-shaped roller press reducer provided in this embodiment of the utility model;

[0019] Figure 2 A first-level planetary-level cross-sectional view provided for an embodiment of this utility model;

[0020] Figure 3 This is a second-level planetary-level cross-sectional view provided for an embodiment of the present invention;

[0021] Figure 4 A cross-sectional view of the first-stage sun gear limiting device provided in an embodiment of this utility model;

[0022] Figure 5 This is a cross-sectional view of the second-stage sun gear limiting device provided in an embodiment of the present invention.

[0023] Among them, 1-input shaft; 2-driven large gear; 3-first stage sun gear; 4-first stage planetary gear; 5-first stage planetary carrier; 51-drive shaft; 52-first stage internal gear ring; 6-first stage limiting component; 7-second stage sun gear; 8-second stage limiting component; 9-second stage planetary gear; 10-second stage planetary carrier; 101-second stage internal gear ring; 11-rolling bearing; 12-first stage high specific pressure sliding bearing; 13-first stage axial limiting thrust bearing; 14-oil reservoir ring; 15-first housing; 16-second housing; 17-third housing; 18-fourth housing; 19-second stage high specific pressure sliding bearing; 20-second stage axial limiting thrust bearing. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] This utility model provides a reducer for a multi-stage star-shaped roller press with sliding bearings. Please refer to the attached instruction manual. Figure 1The sliding bearing multi-stage star-shaped roller press reducer includes an input shaft 1 that provides power. A driven large gear 2 is meshed at the end of the input shaft 1. A first-stage sun gear 3 passes through the inner cavity of the driven large gear 2 and rotates coaxially with the driven large gear 2. A first-stage planetary gear 4 meshes with the outer circumference of the first-stage sun gear 3. The first-stage planetary gear 4 and the first-stage planetary carrier 5 are fixedly connected by a first-stage high-specific-pressure sliding bearing 12. The first-stage planetary gear 4 drives the first-stage planetary carrier 5 to rotate. A drive shaft 51 extends from the side of the first-stage planetary carrier 5 away from the first-stage sun gear 3. The drive shaft 51 is coaxially arranged with the first-stage sun gear 3 and passes through the inner cavity of the second-stage sun gear 7, driving the second-stage sun gear 7 to rotate. The second-stage sun gear 7 is connected to the second-stage planetary carrier 10. The second-stage planetary carrier 10 extends to the end away from the first-stage planetary carrier 5 and has an output end. The output end is connected to an external roller press and drives the roller press to rotate. It should be noted that a first annular platform is provided on the outer periphery of the first-stage sun gear 3. After the first-stage sun gear 3 extends into the driven large gear 2, the first annular platform abuts against the end face of the driven large gear 2. A first-stage limiting member 6 is connected to the end face of the driven large gear 2, clamping the first annular platform between the driven large gear 2 and the first-stage limiting member 6, thereby restricting the axial degree of freedom of the first-stage sun gear 3. When the first-stage planetary gear 4 rotates around the first-stage sun gear 3, the axial stress exerted by the first-stage planetary gear 4 on the first-stage sun gear 3 is canceled out by the first-stage limiting member 6 and the end face of the driven large gear 2, preventing the first-stage sun gear 3 from axially deviating. The displacement leads to unstable power transmission. Similarly, a second ring platform is provided in the inner cavity of the second-stage sun gear 7 to accommodate the drive shaft 51. After the drive shaft 51 extends into the second-stage sun gear 7, it abuts against the end face of the second ring platform. A second-stage limiting member 8 is provided at the port of the second-stage sun gear 7 away from the first-stage sun gear 3. The second-stage limiting member 8 and the end of the drive shaft 51 clamp the second ring platform. The axial degree of freedom of the second-stage sun gear 7 connected to the second ring platform is locked. The second-stage limiting member 8 and the end of the drive shaft 51 counteract the axial stress of the second-stage planetary gear 9, ensuring stable operation of the output end of the second-stage planetary carrier 10.

[0027] Preferably, the present invention has a housing on its outer periphery for protecting each transmission component. The housing includes a first housing 15, an input shaft 1 passing through the side wall of the first housing 15, and rolling bearings 11 respectively fitted at both ends of the input shaft 1 where a gear is located. Each rolling bearing 11 is fixed to the inner wall of the first housing 15 and the second housing 16. Similarly, rolling bearings 11 are provided at both ends of the driven large gear 2, and the bearings at both ends of the driven large gear 2 are located on the inner wall of the first housing 15 and the second housing 16. The second housing 16 is connected to the third housing 17, and rolling bearings 11 are fitted at both ends of the first-stage planetary carrier 5. Each rolling bearing 11 is disposed on the inner wall of the second housing 16 and the third housing 17. Furthermore, a fourth housing 18 is connected to the side of the third housing 17 away from the second housing 16. The output end of the second-stage planetary carrier 10 extends to the outside of the fourth housing 18. The rolling bearings 11 at both ends of the second-stage planetary carrier 10 are disposed on the inner wall of the third housing 17 and the fourth housing 18, respectively. While assisting the rotation of the above-mentioned transmission components, each rolling bearing 11 bears the bending moment and radial force on the above-mentioned transmission components, ensuring the stable rotation of the input shaft 1, the driven large gear 2, the first-stage planetary carrier 5, and the second-stage planetary carrier 10.

[0028] Please refer to the instruction manual appendix. Figure 2 With appendix Figure 3 Each of the first-stage planetary gear 4 and the second-stage planetary gear 9 is equipped with a first-stage high-pressure sliding bearing 12 and a second-stage high-pressure sliding bearing 19. The two ends of the first-stage high-pressure sliding bearing 12 and the second-stage high-pressure sliding bearing 19 are interference-fitted onto the first-stage planetary carrier 5 and the second-stage planetary carrier 10. A first-stage axial limiting thrust bearing 13 and a second-stage axial limiting thrust bearing 20 are provided on both sides of the first-stage planetary gear 4 and the second-stage planetary gear 9 along their axes. That is, the first-stage axial limiting thrust bearing 13 and the second-stage axial limiting thrust bearing 20 are located at both ends of the first-stage high-pressure sliding bearing 12 and the second-stage high-pressure sliding bearing 19, and abut against the side walls of the first-stage planetary gear 4 and the second-stage planetary gear 9, restricting the axial degree of freedom of the first-stage planetary gear 4 and the second-stage planetary gear 9. During the rotation of the first-stage planetary gear 4 and the second-stage planetary gear 9, while ensuring the clamping and locking of the position of the first-stage planetary gear 4 and the second-stage planetary gear 9, the friction experienced by the first-stage planetary gear 4 and the second-stage planetary gear 9 is reduced.

[0029] It should be noted that the first-stage high-pressure sliding bearing 12 and the second-stage high-pressure sliding bearing 19 include an outer bearing shell and an inner bearing bush. The bearing bushes of each of the first-stage high-pressure sliding bearings 12 and 19 are interference-fitted onto the first-stage planetary carrier 5 and the second-stage planetary carrier 10. Since there is a large bearing area between the bearing bush and the bearing shell of the first-stage high-pressure sliding bearing 12 and 19, they have a stronger load-bearing capacity compared to rolling bearings. Using the first-stage high-pressure sliding bearings 12 and 19 can enhance the load-bearing capacity of this utility model. In addition, the main components of the first-stage high-pressure sliding bearings 12 and 19 are only the interlocking bearing bush and bearing shell. The first-stage high-pressure sliding bearings 12 and 19 are easy to maintain and flexible to install, which improves the maintainability of the reducer for planetary roller presses.

[0030] Preferably, a first-stage internal gear ring 52 and a second-stage internal gear ring 101 are respectively provided on the sidewalls of the first-stage planetary carrier 5 and the second-stage planetary carrier 10 parallel to their axes. The first-stage internal gear ring 52 meshes with the first-stage planetary gear 4, and the second-stage internal gear ring 101 meshes with the second-stage planetary gear 9. It should be noted that each planetary gear in each planetary stage can bear a portion of the torque transmitted by the input shaft 1. By increasing the number of first-stage planetary gears 4 and second-stage planetary gears 9, the maximum load of the first-stage planetary carrier 5 and the second-stage planetary carrier 10 is increased, while the load borne by each first-stage planetary gear 4 and second-stage planetary gear 9 is reduced, thereby increasing the service life of the first-stage planetary gears 4 and second-stage planetary gears 9. The number of first-stage planetary gears 4 is three or more, and the number of second-stage planetary gears 9 is five or more.

[0031] An oil reservoir ring 14 is fitted around the outer periphery of the drive shaft 51. A locking ring extends along the outer wall of the oil reservoir ring 14. The locking ring is clamped between the third housing 17 and the second-stage planetary carrier 10 to determine the position of the oil reservoir ring 14. A first-stage oil reservoir and a second-stage oil reservoir are respectively provided on the inner and outer walls of the oil reservoir ring 14. The first-stage oil reservoir is located at the end of the oil reservoir ring 14 near the first-stage sun gear 3, and the second-stage oil reservoir is located at the end of the oil reservoir ring 14 near the second-stage sun gear 7. The lubricating oil in the first-stage oil reservoir and the second-stage oil reservoir overflows into the mating gap of each transmission component to reduce the friction between each transmission component.

[0032] Please refer to the instruction manual appendix. Figure 1 Appendix Figure 4 With appendix Figure 5Both the first-stage limiting member 6 and the second-stage limiting member 8 are specifically ring-shaped. The first-stage limiting member 6 extends from the end opposite to the driven large gear 2 towards the side close to the axis of the first-stage sun gear 3, forming a first-stage limiting ring. The end face of the first-stage limiting ring abuts against the first ring platform, which is clamped and fixed between the first limiting ring and the end face of the driven large gear 2. The second-stage limiting member 8 extends from the end opposite to the drive shaft 51 towards the side opposite to the axis of the drive shaft 51 to form a second-stage limiting ring. The end face of the second-stage limiting ring and the end face of the drive shaft 51 clamp the second ring platform. Preferably, the first-stage limiting member 6 and the driven large gear 2, and the second-stage limiting member 8 and the drive shaft 51 are connected by screwing fastening bolts.

[0033] In one embodiment of this application, the input shaft 1 is connected to the drive motor via a keyway. The drive motor drives the input shaft 1 to rotate, and the driven large gear 2 meshing with the input shaft 1 rotates accordingly. During the rotation of the driven large gear 2, the first-stage sun gear 3 rotates coaxially. The first-stage planetary gears 4, evenly distributed on the outer periphery of the first-stage sun gear 3, drive the first-stage planetary carrier 5 to rotate. During the operation of the above-mentioned transmission components, the first-stage limiting member 6 eliminates the axial force of the first-stage sun gear 3. The rolling bearing 11 bears the bending moment and radial load of the driven large gear 2, the first-stage planetary carrier 5, and the input shaft 1. The first-stage axial limiting thrust bearing 13 eliminates the first-stage planetary gears 4. The axial force of the drive motor is split and transmitted to the second-stage sun gear 7 through the transmission shaft 51. The second-stage sun gear 7 drives the second-stage planetary gear 9 on the outer periphery to rotate. The second-stage planetary gear 9 drives the second-stage planetary carrier 10 to rotate. Similarly, the second-stage limiting member 8 eliminates the axial force of the second-stage sun gear 7. The rolling bearing 11 bears the bending moment and radial load of the second-stage planetary carrier 10. The second-stage axial limiting thrust bearing 20 eliminates the axial force of the second-stage planetary gear 9. The output end of the second-stage planetary carrier 10 outputs the split power to the roller press. Preferably, the output end of the second-stage planetary carrier 10 is connected to the roller press through a locking disc. The first-stage sun gear 3, the first-stage planetary gear 4, and the first-stage planetary carrier 5 are collectively referred to as the first-stage planetary group, and the second-stage sun gear 7, the second-stage planetary gear 9, and the second-stage planetary carrier 10 are collectively referred to as the second-stage planetary group. The rotational speed of the first-stage sun gear 3 is greater than the rotational speed of the first-stage planetary carrier 5, that is, the rotational speed of the first-stage sun gear 3 is greater than the rotational speed of the drive shaft 51. According to the formula P=Tω (P is power, T is torque, and ω is rotational speed), it can be seen that when the input power of the drive motor is fixed, the rotational speed and torque are inversely proportional. That is, the torque of the drive shaft 51 is increased by the first-stage planetary group. Similarly, it can be seen that the torque at the output end of the second-stage planetary carrier 10 is further increased by the second-stage planetary group, ensuring that the roller press has reliable crushing ability.

[0034] It should be noted that in this specification, relational terms such as first-level and second-level are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0035] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A reducer for a multi-stage star-shaped roller press with sliding bearings, characterized in that, include: An input shaft (1) is provided, with a driven large gear (2) meshing at its end. A first-stage sun gear (3) is fitted inside the driven large gear (2). A first-stage planet gear (4) meshes at the end of the first-stage sun gear (3) away from the input shaft (1). The first-stage planet gear (4) is connected to a first-stage planet carrier (5). A drive shaft (51) extends from the first-stage planet carrier (5) away from the driven large gear (2). The drive shaft (51) passes through the inner cavity of a second-stage sun gear (7). A second-stage planet gear (9) meshes on the outer periphery of the second-stage sun gear (7). The second-stage planet gear (9) is connected to a second-stage planet carrier (10). The second-stage planet gear (9) drives the second-stage planet carrier (10) to rotate. The first-stage sun gear (3) has a first ring platform extending from its outer periphery, and the second-stage sun gear (7) has a second ring platform extending from its inner cavity. The port of the driven large gear (2) and the port of the second-stage sun gear (7) are respectively connected to the first-stage limiting member (6) and the second-stage limiting member (8). The first-stage limiting member (6) and the port of the driven large gear (2) clamp the first-stage sun gear (3), and the second-stage limiting member (8) and the transmission shaft (51) clamp the second-stage sun gear (7).

2. The reducer for a multi-stage star-shaped roller press with sliding bearings according to claim 1, characterized in that, The first-stage planetary gear (4) is connected to the first-stage planetary carrier (5) through a first-stage high-specific-pressure sliding bearing (12), and the second-stage planetary gear (9) is connected to the second-stage planetary carrier (10) through a second-stage high-specific-pressure sliding bearing (19). The first-stage axial limiting thrust bearing (13) and the second-stage axial limiting thrust bearing (20) are respectively provided between the two end faces of the first-stage planetary gear (4) and the inner walls of the two sides of the first-stage planetary carrier (5), and between the two end faces of the second-stage planetary gear (9) and the inner walls of the two sides of the second-stage planetary carrier (10).

3. The reducer for a multi-stage star-shaped roller press with sliding bearings according to claim 2, characterized in that, Rolling bearings (11) are fitted on both sides of the input shaft (1), the driven large gear (2), the first-stage planetary carrier (5), and the second-stage planetary carrier (10).

4. The reducer for a multi-stage star-shaped roller press with sliding bearings according to claim 3, characterized in that, The rolling bearings (11) at both ends of the input shaft (1) and the driven large gear (2) are respectively fixed on the inner walls of the first housing (15) and the second housing (16). The rolling bearings (11) at both ends of the first-stage planetary carrier (5) are respectively fixed on the inner walls of the second housing (16) and the third housing (17). The rolling bearings (11) at both ends of the second-stage planetary carrier (10) are fixed on the third housing (17) and the fourth housing (18).

5. The reducer for a multi-stage star-shaped roller press with sliding bearings according to claim 4, characterized in that, The transmission shaft (51) is fitted with an oil storage ring (14) on its outer periphery. The oil storage ring (14) is fitted with a locking ring on its outer periphery. The third housing (17) and the second-stage planetary carrier (10) hold the locking ring. The inner and outer walls of the oil storage ring (14) are respectively provided with a first oil storage groove and a second oil storage groove. The first oil storage groove is used to provide lubricating oil for the first-stage planetary gear (4), and the second oil storage groove is used to provide lubricating oil for the second-stage planetary gear (9).

6. The reducer for a multi-stage star-shaped roller press with sliding bearings according to claim 4, characterized in that, Each of the first-stage high-specific-pressure sliding bearings (12) and the second-stage high-specific-pressure sliding bearings (19) is fixed to the first-stage planetary carrier (5) and the second-stage planetary carrier (10) by interference fit.

7. The reducer for a multi-stage star-shaped roller press with sliding bearings according to claim 6, characterized in that, The first-stage planetary carrier (5) and the second-stage planetary carrier (10) are respectively provided with a first-stage internal gear ring (52) and a second-stage internal gear ring (101) that mesh with the first-stage planetary gear (4) and the second-stage planetary gear (9); the number of the first-stage planetary gear (4) is not less than 3 and the number of the second-stage planetary gear (9) is not less than 5.

8. The reducer for a multi-stage star-shaped roller press with sliding bearings according to claim 3, characterized in that, Both the first-level limiting member (6) and the second-level limiting member (8) are specifically ring-shaped. The first-level limiting member (6) extends a first-level limiting ring towards the side closer to the first-level sun gear (3), and the second-level limiting member (8) extends a second-level limiting ring towards the side away from the second-level sun gear (7).

9. The reducer for a multi-stage star-shaped roller press with sliding bearings according to claim 8, characterized in that, The input shaft (1) is provided with a keyway, which engages with the drive motor. The end of the second-stage planetary carrier (10) that is away from the first-stage planetary carrier (5) is connected to the roller press through a locking disc.

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