Planetary roller based electric cylinder roller coater adjustment mechanism

Abstract

A kind of electric cylinder roller coater adjusting mechanism based on planetary roller, for mechanical transmission field.Motor is connected with planetary gear reducer, planetary gear reducer is fixed with bearing seat, bearing seat is fixed with one end of shell, planetary gear reducer is connected with one end of planetary roller screw through shaft coupling, angular contact ball bearing is equipped between planetary roller screw and bearing seat, one end of push rod is connected with nut, nut is connected with planetary roller screw through roller thread, push rod is slidably connected with shell, sealing end cover is fixed with the other end of shell by screw, copper slide block is arranged between sealing end cover and push rod, sealing ring is arranged between push rod and sealing end cover, joint bearing is arranged between the other end of push rod and joint bearing seat ring, joint bearing pressing cap is fixed with push rod, joint bearing is connected with pressure sensor, pressure sensor is connected with roller coater roller.The utility model can realize the accurate adjustment of roller coater pressure, and better satisfy the coating thickness≤0.005mm coating requirement.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission technology, specifically an adjustment mechanism for an electric cylinder roller coating machine based on planetary rollers. Background Technology

[0002] In the coating industry, roller coaters are widely used for the tight coating of continuous roll materials such as metal sheets, plastic films, and paper due to their high efficiency, strong adaptability, and good coating uniformity. Traditional roller coaters mostly rely on hydraulic cylinders or pneumatic cylinders to drive the lifting, pressure adjustment, and gap control of the coating roller and back pressure roller. However, this structure is unstable in terms of precise control of coating thickness at the micron level, has a slow response speed, and is difficult to achieve coating thicknesses ≤0.005mm. It also has drawbacks such as complex maintenance and high energy consumption.

[0003] Existing roller coating machines commonly use pressure regulating devices such as lifting mechanisms, hydraulic cylinders, and ball screws to ensure lifting, pressure regulation, and gap control, respectively. This structure offers high output force and strong overload resistance. However, for achieving coating thicknesses ≤0.005mm, existing regulating devices have the following problems:

[0004] 1. When controlling the instantaneous increase or decrease of pressure in the roller coating machine, the hydraulic cylinder can meet the requirements, but it cannot meet the requirements for small adjustments of pressure.

[0005] 2. The elevator has a large backlash, which results in low adjustment accuracy and a large footprint.

[0006] 3. Ball screws can achieve micro-backlash control, with the backlash typically controlled between 0.01-0.015mm. However, their manufacturing difficulty and cost are too high. To reduce the backlash, preload is usually used, but it is difficult to completely eliminate the backlash. During use, friction and wear will increase, and the backlash will gradually increase.

[0007] 4. The hydraulic cylinder requires regular replacement of seals and filters, maintenance of hydraulic lines, and troubleshooting is difficult.

[0008] In summary, the commonly used adjustment mechanism of roller coating machine has a large reverse clearance, which cannot meet the coating thickness requirement of ≤0.005mm, and the adjustment stability is poor, resulting in poor uniformity of coating thickness. Summary of the Invention

[0009] To overcome the shortcomings of the existing technology, the purpose of this invention is to provide an electric cylinder adjustment mechanism for a roller coating machine based on planetary rollers, which uses planetary rollers as the transmission mechanism of the electric cylinder to improve the adjustment accuracy of the roller coating machine.

[0010] To achieve the above-mentioned objectives, this utility model discloses an adjustment mechanism for an electric cylinder roller coating machine based on planetary rollers. The motor is connected to a planetary gear reducer. The planetary gear reducer is fixed to a bearing housing with screws. The bearing housing is fixed to one end of the housing with screws. The planetary gear reducer is connected to one end of a planetary roller screw via a coupling. An angular contact ball bearing is installed between the planetary roller screw and the bearing housing. One end of a push rod is connected to a nut with screws. The nut and the planetary roller screw are connected via roller threads. The push rod is slidably connected to the housing. A sealing end cap is fixed to the other end of the housing with screws. A copper slider is provided between the sealing end cap and the push rod. A Y-shaped sealing ring is provided between the push rod and the sealing end cap. A spherical bearing is provided between the other end of the push rod and the spherical bearing housing ring. The spherical bearing cap is threadedly connected to the push rod and fixed with screws. The spherical bearing is fixed to a pressure sensor with screws. The pressure sensor is connected to the rollers of the roller coating machine.

[0011] Furthermore, the nut and the planetary roller screw are connected by an interference fit of the rollers. The rollers are studs with external threads that are adapted to the internal threads of the nut and the external threads of the planetary roller screw, respectively.

[0012] Furthermore, the outer circle of the push rod is slidably engaged with the sliding groove of the housing via a key, and a press-fit type oil cup is installed on the outer circle of the push rod, with the oil outlet of the press-fit type oil cup facing the roller.

[0013] Furthermore, the end of the planetary roller screw mates with the inner ring of the angular contact ball bearing, the outer ring of the angular contact ball bearing mates with the bearing housing, the outer ring of the angular contact ball bearing is fixed by the bearing end cover and the inner hole step of the bearing housing, and the inner ring of the angular contact ball bearing is fixed by the shoulder of the planetary roller screw and the lock nut.

[0014] Furthermore, the outer circle of the copper slider is fitted with the sealing end cap with a clearance fit, the inner hole of the copper slider is fitted with the push rod with a clearance fit, and the copper slider is fixed inside the sealing end cap by an elastic retaining ring.

[0015] Furthermore, the Y-shaped sealing ring is connected to the sealing end cap and the push rod, and the sealing end cap axially fixes the Y-shaped sealing ring.

[0016] Furthermore, the spherical bearing seat ring and the spherical bearing cover are fixed together by screws, and the spherical bearing is connected to the spherical bearing seat ring.

[0017] Furthermore, an oil plug and an air valve are installed on the outer circumference of the housing.

[0018] Furthermore, the pressure sensor is connected to the long roller seat of the roller coating machine by screws, and the two ends of the roller are connected to the long roller seat by ball bearings. The outer circle of the roller shaft end fits with the inner ring of the ball bearing, and the outer ring of the ball bearing fits with the long roller seat and the bearing cover. The end cap and the through cap are fixed at the axial position at both ends of the ball bearing.

[0019] The motor drive of this invention converts the rotational motion of the planetary roller screw into the linear motion of the push rod through the threaded connection between the planetary roller screw, rollers, and nut. The planetary reducer enables the planetary roller screw to achieve a small lead and a large reduction ratio, thus realizing the micro-adjustment of the rollers of the roller coating machine by the planetary roller screw. The encoder on the motor can control the extension or retraction distance of the push rod. By observing the display results of the pressure sensor, the motor brake locks when the rollers of the roller coating machine reach the appropriate position.

[0020] Compared with the prior art, this utility model has a simple structure, strong load-bearing capacity, can achieve precise pressure adjustment of the roller coating machine, saves space, is easy to maintain, and can better meet the coating requirements of roller coating machines with a coating thickness of ≤0.005mm. It has the following advantages:

[0021] The planetary roller screw employs line contact with the rollers and nut, internal preload with interference fit, and excellent rigidity, enabling it to achieve near-zero backlash.

[0022] The lead of the planetary roller screw can be as low as 0.25mm, which can effectively achieve the micro-gap or micro-pressure control required by the roller coating machine.

[0023] Planetary roller screws are smaller than ball screws under the same load, while achieving the same adjustment accuracy and occupying less space.

[0024] Planetary roller screws have a long service life and only require periodic lubrication, making maintenance simple and convenient. Attached Figure Description

[0025] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0026] Figure 1 This is a simplified structural diagram of the present invention.

[0027] Figure 2 This is a structural diagram showing the connection between the pressure sensor of this utility model and the roller of the roller coating machine.

[0028] Figure 3 yes Figure 2 AA sectional view.

[0029] In the diagram: 1. Motor; 2. Planetary reducer; 3. Coupling; 4. Bearing housing; 5. Locking nut; 6. Bearing end cover; 7. Angular contact ball bearing; 8. Planetary roller screw; 9. Nut; 10. Roller; 11. Push rod; 12. Press-fit oil cup; 13. Oil plug; 14. Key; 15. Air valve; 16. Housing; 17. Hole retaining ring; 18. Copper slider; 19. Sealing end cover; 20. Y-type sealing ring; 21. Spherical plain bearing cover; 22. Spherical plain bearing seat ring; 23. Spherical plain bearing; 24. Pressure sensor; 25. Long roller seat; 26. Ball bearing; 27. Through cover; 28. Bearing cover; 29. ​​End cap; 30. Roller. Detailed Implementation

[0030] To make the invention's objectives, technical solutions, and advantages clearer, the present invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of protection of the present invention.

[0031] like Figure 1 , Figure 2 , Figure 3 As shown, in this utility model, the motor 1 of the fine-tuning mechanism of an electric cylinder roller coating machine based on planetary rollers is connected to the planetary gear reducer 2. The planetary gear reducer 2 is fixed to the bearing housing 4 by screws. The bearing housing 4 is fixed to one end of the housing 16 by screws. The planetary gear reducer 2 is connected to one end of the planetary roller screw 8 through the coupling 3. An angular contact ball bearing 7 is installed between the planetary roller screw 8 and the bearing housing 4. One end of the push rod 11 is connected to the nut 9 by screws. The nut 9 is threadedly connected to the planetary roller screw 8 through the roller 10. The push rod 11 is slidably connected to the housing 16. The sealing end cap 19 is fixed to the other end of the housing 16 by screws. A copper slider 18 is provided between the sealing end cap 19 and the push rod 11. A Y-shaped sealing ring 20 is provided between the push rod 11 and the sealing end cap 19. A spherical bearing 23 is provided between the other end of the push rod 11 and the spherical bearing seat 22. The spherical bearing cover 21 is connected to the push rod 11 by threads and fixed with screws. The spherical bearing 23 is connected to the pressure sensor 24 by screws. The pressure sensor 24 is connected to the roller 30 of the roller coating machine. The pressure sensor 24, the motor 1 and the control system of the roller coating machine are connected.

[0032] Preferably, the nut 9 and the planetary roller screw 8 are connected by an interference fit with rollers 10. The preload is 2% to 3% of the rated load of the roller screw 8. The rollers 10 are stud structures, and their external threads mesh with the internal threads of the nut 9 and the external threads of the planetary roller screw 8, respectively. The three are in line contact. By precisely controlling the dimensions of the rollers 10, zero or negative clearance preload is achieved between the nut 9, the planetary roller screw 8, and the rollers 10. Under load, the slight elastic deformation of the roller screw 8 will manifest as backlash during reverse movement. The interference fit design between the rollers 10, the nut 9, and the planetary roller screw 8 is designed to eliminate backlash in the planetary roller screw 8 during manufacturing. Due to the high rigidity inherent in the linear contact characteristics of the three components, they possess higher axial rigidity. Under load, the possibility of elastic deformation in the planetary roller screw 8, rollers 10, and nut 9 system is very small, and the amount of elastic deformation is extremely small, resulting in zero backlash in the roller screw 8.

[0033] Preferably, the outer circle of the push rod 11 is slidably engaged with the groove of the housing 16 via the key 14 to ensure that the push rod 11 moves linearly during the movement; a press-fit type oil cup 12 is installed on the outer circle of the push rod 11, and the oil outlet of the press-fit type oil cup 12 faces the roller 10 to ensure smooth operation between the planetary roller screw 8, the nut 9 and the roller 10.

[0034] Preferably, the end of the planetary roller screw 8 is fitted with the inner ring of the angular contact ball bearing 7, the outer ring of the angular contact ball bearing 7 is fitted with the bearing housing 4, the outer ring of the angular contact ball bearing 7 is fixed by the bearing end cover 6 and the inner hole step of the bearing housing 4, and the inner ring of the angular contact ball bearing 7 is fixed by the shoulder of the planetary roller screw 8 and the lock nut 5.

[0035] Preferably, the outer circle of the copper slider 18 is clearance-fitted with the sealing end cap 19, the inner hole of the copper slider 18 is clearance-fitted with the push rod 11, and the copper slider 18 is fixed inside the sealing end cap 19 by an elastic retaining ring 17.

[0036] Preferably, the Y-shaped sealing ring 20 is connected to the sealing end cap 19 and the push rod 11, and the sealing end cap 19 axially fixes the Y-shaped sealing ring 20.

[0037] Preferably, the spherical bearing seat 22 and the spherical bearing cover 21 are fixed together by screws, the spherical bearing 23 is connected to the spherical bearing seat 22, and the spherical bearing cover 21 and the push rod 11 are fixed together by screws, so that the axial force of the roller of the roller coating machine is always perpendicular to the pressure sensor 24 during operation.

[0038] Preferably, an oil plug 13 and an air valve 15 are installed on the outer circumference of the housing 16, and the air valve 15 can effectively ensure the pressure balance inside the housing 16.

[0039] Preferably, the pressure sensor 24 is connected to the long roller seat 25 of the roller coating machine by screws. Both ends of the roller 30 are connected to the long roller seat 25 via ball bearings 26. The outer diameter of the roller 30's shaft end mates with the inner ring of the ball bearing 26. The outer ring of the ball bearing 26 mates with the long roller seat 25 and the bearing cover 28. The end cap 29 and the through cap 27 are fixed at the axial positions of both ends of the ball bearing 26. The pressure sensor 24 transmits its output signal to the input terminal of the roller coating machine control system. The control system reads the value of the pressure sensor 24 and transmits the control command to the control input terminal of the motor 1 driver. The motor 1 driver receives the low-power command signal, performs internal processing and power amplification, and sends a high-power current to the motor 1, driving the motor 1 to rotate.

[0040] The working principle of the micro-adjustment mechanism of the electric cylinder roller coating machine based on planetary rollers of this utility model is as follows:

[0041] Driven by motor 1, the rotational motion of planetary roller screw 8 is converted into linear motion of push rod 11 through the threaded connection between planetary roller screw 8, roller 10 and nut 9. The planetary reducer 2 enables planetary roller screw 8 to achieve small lead and large reduction ratio, realizing the micro-adjustment of roller 30 of roller coating machine by planetary roller screw 8. The encoder on motor 1 can control the extension or retraction distance of push rod 11. By observing the display result of pressure sensor 24, when roller 30 of roller coating machine reaches the appropriate position, motor 1 brake locks.

[0042] Push rod 11 is connected to nut 9. Key 14 prevents push rod 11 from rotating. The rotation of motor 1 is converted into linear motion of push rod 11 through planetary roller screw 8, roller 10 and nut 9, thereby controlling the roller 30 of the roller coating machine. Figure 2 The pressure between only one of the rollers is shown. The planetary roller screw 8, roller 10 and nut 9 are interference-loaded to eliminate the backlash of the planetary roller screw 8. The planetary roller screw 8 has a small lead. The speed of motor 1 is transmitted through the planetary reducer 2 and the planetary roller screw 8. During the pressure adjustment process, fine adjustments can be made, making the pressure adjustment of the roller 30 of the roller coating machine more precise.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An adjustment mechanism for an electric cylinder roller coating machine based on planetary rollers, characterized in that: The motor (1) is connected to the planetary gear reducer (2). The planetary gear reducer (2) is fixed to the bearing housing (4) by screws. The bearing housing (4) is fixed to one end of the housing (16) by screws. The planetary gear reducer (2) is connected to one end of the planetary roller screw (8) through the coupling (3). An angular contact ball bearing (7) is installed between the planetary roller screw (8) and the bearing housing (4). One end of the push rod (11) is connected to the nut (9) by screws. The nut (9) is connected to the planetary roller screw (8) by the roller (10) thread. The push rod (11) is slidably connected to the housing (16). The sealing end cover (19) is connected by screws. The nail is fixed to the other end of the housing (16). A copper slider (18) is provided between the sealing end cap (19) and the push rod (11). A Y-shaped sealing ring (20) is provided between the push rod (11) and the sealing end cap (19). A spherical bearing (23) is provided between the other end of the push rod (11) and the spherical bearing seat (22). The spherical bearing cover (21) is connected to the push rod (11) by a thread and fixed with a screw. The spherical bearing (23) is connected to the pressure sensor (24) by a screw. The pressure sensor (24) is connected to the roller (30). The pressure sensor (24), the motor (1) and the control system of the roller coating machine are connected.

2. The adjusting mechanism of an electric cylinder roller coating machine based on planetary rollers according to claim 1, characterized in that: The nut (9) and the planetary roller screw (8) are connected by an interference fit of rollers (10). The rollers (10) are stud structures, and their external threads are adapted to the internal threads of the nut (9) and the external threads of the planetary roller screw (8).

3. The adjusting mechanism of an electric cylinder roller coating machine based on planetary rollers according to claim 1, characterized in that: The outer circle of the push rod (11) is slidably engaged with the groove of the housing (16) via a key (14). A press-fit oil cup (12) is installed on the outer circle of the push rod (11), and the oil outlet of the press-fit oil cup (12) faces the roller (10).

4. The adjusting mechanism of an electric cylinder roller coating machine based on planetary rollers according to claim 1, characterized in that: The end of the planetary roller screw (8) is engaged with the inner ring of the angular contact ball bearing (7), the outer ring of the angular contact ball bearing (7) is engaged with the bearing housing (4), the outer ring of the angular contact ball bearing (7) is fixed by the bearing end cover (6) and the inner hole step of the bearing housing (4), and the inner ring of the angular contact ball bearing (7) is fixed by the shoulder of the planetary roller screw (8) and the lock nut (5).

5. The adjusting mechanism of an electric cylinder roller coating machine based on planetary rollers according to claim 1, characterized in that: The outer circle of the copper slider (18) is fitted with the sealing end cap (19) with a clearance fit, and the inner hole of the copper slider (18) is fitted with the push rod (11) with a clearance fit. The copper slider (18) is fixed inside the sealing end cap (19) by an elastic retaining ring (17).

6. The adjusting mechanism of an electric cylinder roller coating machine based on planetary rollers according to claim 1, characterized in that: The Y-shaped sealing ring (20) is connected to the sealing end cap (19) and the push rod (11), and the sealing end cap (19) axially fixes the Y-shaped sealing ring (20).

7. The adjusting mechanism of an electric cylinder roller coating machine based on planetary rollers according to claim 1, characterized in that: The spherical bearing seat (22) and the spherical bearing cap (21) are fixed together by screws, and the spherical bearing (23) is connected to the spherical bearing seat (22).

8. The adjusting mechanism of an electric cylinder roller coating machine based on planetary rollers according to claim 1, characterized in that: An oil plug (13) and an air valve (15) are installed on the outer circumference of the housing (16).

9. The adjusting mechanism of an electric cylinder roller coating machine based on planetary rollers according to claim 1, characterized in that: The pressure sensor (24) is connected to the long roller seat (25) of the roller coating machine by screws. The two ends of the roller (30) are connected to the long roller seat (25) by ball bearings (26). The outer circle of the shaft end of the roller (30) is fitted with the inner ring of the ball bearing (26). The outer ring of the ball bearing (26) is fitted with the long roller seat (25) and the bearing cover (28). The end cap (29) and the through cap (27) are fixed at the axial positions of the two ends of the ball bearing (26).

Images