Polishing disc device on double-sided polishing machine tool

Abstract

A polishing disc device on a double-face polishing machine tool comprises a base, a polishing assembly, a center rod, a polishing disc mounting assembly, a polishing disc, a rotary driving assembly, a polishing motor and a rotary rod. The polishing device comprises a polishing assembly, a lifting assembly, a slide carriage and a mounting seat and is characterized in that a gravity self-balancing device and a pressure control device which are jointly connected with the polishing assembly are arranged on the mounting seat, the gravity self-balancing device is provided with a plurality of first sliding rods, one ends of the first sliding rods are fixed to a lower round mounting plate, and the other ends of the first sliding rods penetrate through a moving seat, are connected with the moving seat in a sliding mode and then are connected with an upper round mounting plate; the outer wall of the center rod is sleeved with first elastic pieces, and the first elastic pieces are distributed between the lower round mounting plate and the movable base to balance the weight of the polishing assembly and the weight of the movable base. The pressure sensor is arranged below a piston rod of the pressure cylinder in an abutting manner, is arranged on the top of the movable seat and is used for measuring the polishing pressure and outputting a pressure signal; and the controller adjusts the polishing pressure according to the measured value, so that the polishing pressure of the polishing disc is accurately measured and controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of optical precision machining, and particularly to a polishing disc device on a double-sided polishing machine tool. Background Art

[0002] Double-sided polishing machine tools are mainly used for precision polishing of the surfaces of flat optical elements. Their main feature is that on the basis of obtaining good flatness of the optical elements through grinding, tiny protrusions, pits and surface damaged layers on the workpiece surface are removed by chemical and mechanical polishing methods to obtain a bright and flat precision element surface. According to the process requirements, it is necessary to adjust the pressure on the upper polishing disc from zero. Existing equipment realizes the up and down movement of the polishing disc and the control of the pressure on the optical element surface through a separate moving device. The polishing pressure is affected by the gravity of the upper polishing disc and the moving device itself, which limits the adjustment range of the polishing pressure, and it is impossible to accurately measure and control the polishing pressure on the optical element surface, and it is easy to have excessive processing pressure and uncertainty in the processing results. Therefore, it is necessary to propose a polishing disc device on a double-sided polishing machine tool with gravity self-balancing to at least partially solve the problems existing in the prior art. Summary of the Invention

[0003] The present invention mainly aims at the problems of the prior art and proposes a polishing disc device on a double-sided polishing machine tool. During the polishing process, the controller detects the polishing pressure value in real time through a pressure regulating device and adjusts the pressure according to the measured value, thereby adjusting the polishing pressure to achieve pressure balance. It not only has a simple structure, low cost, convenient operation, but also can accurately measure and control the polishing pressure.

[0004] The technical solution of the present invention is: A polishing disc device on a double-sided polishing machine tool, comprising:

[0005] A base;

[0006] A polishing assembly, including a central rod, a polishing disc mounting assembly and a polishing disc. The lower end of the longitudinally arranged central rod is connected with a polishing disc through the polishing disc mounting assembly;

[0007] A rotation driving assembly, including a polishing motor, a driving and rotating rod;

[0008] A lifting assembly, including a sliding plate, and mounting seats are respectively arranged on the sliding plate and are fixedly arranged on the outer wall of the base in a vertically movable manner;

[0009] It is characterized in that a gravity self-balancing device and a pressure control device for jointly connecting the polishing assembly are arranged on the mounting seat, wherein

[0010] The gravity self-balancing device has:

[0011] A plurality of first sliding rods are horizontally distributed, one end of which is fixed to the lower circular mounting plate, and the other end of which passes through the moving seat and is slidably connected to the moving seat and then connected to the upper circular mounting plate;

[0012] A movable seat is arranged between the upper circular mounting plate and the lower circular mounting plate. The upper and lower circular mounting plates are arranged concentrically with the center rod. The movable seat is fixedly connected to the upper end of the center rod. A first elastic member is sleeved on the outer wall of the center rod and is distributed between the lower circular mounting plate and the movable seat to balance the weight of the polishing assembly and the movable seat.

[0013] The pressure control device has:

[0014] A pressure cylinder is installed at the bottom of the upper circular mounting plate, and the lower end of the piston rod that can move up and down is in abutment with the moving seat to push the polishing disc up and down and apply polishing pressure;

[0015] A pressure sensor is arranged under the piston rod of the pressure cylinder and on the top of the moving seat to measure the polishing pressure and output a pressure signal;

[0016] A controller, whose signal input end is connected to the output end of the pressure sensor, receives the output pressure signal, and correspondingly, executes the signal output end to connect the control valve of the pressure cylinder. The controller adjusts the polishing pressure according to the measured value, thereby realizing accurate measurement and control of the polishing pressure of the polishing disk.

[0017] Furthermore, the lifting assembly also includes a ball screw, which is connected to the bottom of the lifting motor installed on the base. The ball screw is provided with a mother seat that can move up and down, and the mother seat is fixed on the side wall of the slide.

[0018] Furthermore, a guide mechanism is provided between the base and the slide, at least one linear guide rail distributed up and down is provided on the outer wall of the base, a slide rail is fixed on the linear guide rail so as to slide up and down, and a limit function is provided on the top of the base.

[0019] Furthermore, the polishing disc mounting assembly includes a mounting disc, a ball head seat is provided on the top of the mounting disc, a ball head fixing cover is fixed on the top of the ball head seat, a ball head rod is provided between the ball head seat and the ball head fixing cover, the lower section of the ball head rod and the ball head fixing cover are connected by a pin, and the upper section of the ball head rod is detachably connected to the bottom of the center rod.

[0020] Furthermore, the detachable connection adopts a threaded connection or a clip-on connection with a polygonal hole.

[0021] Furthermore, the mounting plate has a T-shaped cross section, a mounting positioning surface is provided at the bottom, which matches the fixing groove at the top of the polishing plate and is fixed by bolts.

[0022] Further, the rotation drive assembly includes a polishing motor, a pneumatic and electrical integrated slip ring, and a rotating rod. The mounting seat includes upper and lower mounting seats. A polishing motor is provided at the top of the upper mounting seat. The bottom output shaft of the polishing motor is connected to the upper end of the rotating rod. The rotating rod passes through the upper mounting seat through a bearing, so that the lower end of the rotating rod is connected to the center of the upper circular mounting plate in the gravity self-balancing device. An pneumatic and electrical integrated slip ring is arranged on the upper part of the rotating rod. The pneumatic and electrical integrated slip ring has a stator and a rotor, so that gas and electricity are input from the fixed stator and output from the rotating rotor, for the gas supply of the pressure cylinder and the electrical signal connection of the pressure sensor.

[0023] Further, the central rod is a spline rod. A spline is installed in the lower mounting seat by opening a hole, so that the spline rod is matched with the spline through a spline groove and is installed in the lower mounting seat in a vertically movable manner.

[0024] Further, a second sliding rod is provided at the bottom of the piston rod. The second sliding rod is slidably connected to the piston rod, and a second elastic member is sleeved on the outer wall of the second sliding rod.

[0025] Finally, the rotating rod, the pressure cylinder, the central rod, and the polishing disc are arranged on the same central axis.

[0026] Compared with the prior art, the advantages of this product are as follows:

[0027] (1) The lifting assembly drives the polishing disc to move to the surface of the optical element, shortening the length of the spline rod, making the structure of the upper polishing disc device more stable and not vibrating when applying a large pressure;

[0028] (2) The lifting assembly drives the polishing disc to move to the surface of the optical element, shortening the movement stroke of the piston rod of the pressure cylinder, and enabling more precise control of the polishing pressure;

[0029] (3) Using the gravity self-balancing device realizes the self-balancing of the gravity of the polishing assembly and the moving seat, making the polishing pressure on the element surface the same as the pressure applied by the air cylinder, thereby realizing the precise measurement and control of the polishing pressure on the upper polishing disc, and avoiding over-polishing caused by inaccurate polishing pressure measurement and excessive processing pressure;

[0030] (4) Using the gravity self-balancing device realizes the self-balancing of the gravity of the polishing assembly and the moving seat, avoiding the influence of the gravity of the polishing disc on the polishing pressure, enabling the control of the polishing pressure starting from zero, expanding the adjustment range of the polishing pressure, and meeting the small-pressure process requirements of double-sided polishing for the polishing pressure;

[0031] (5) Using the polishing motor to directly drive the gravity self-balancing device and the polishing assembly to rotate together simplifies the structure of the upper polishing disc device and ensures the stability of the rotation of the upper polishing disc during the polishing process;

[0032] (6) The ball head rod and the ball head seat can move freely at a small angle, ensuring that the polishing disc and the lower polishing disc are always parallel during the processing, and avoiding the uncertainty during the processing. Description of the Drawings

[0033] Figure 1 It is a vertical schematic diagram of the present invention.

[0034] Figure 2 It is a side view of the gravity self - balancing device.

[0035] Figure 3 It is a cross - sectional view of the gravity self - balancing device.

[0036] Figure 4 It is a side view of the present invention.

[0037] Figure 5 It is a cross - sectional view of the present invention.

[0038] In the figure, 1. Base, 2. Polishing assembly, 3. Central rod, 4. Polishing disc mounting assembly, 5. Polishing disc, 6. Lifting assembly, 7. Saddle, 8. Mounting seat, 9. Gravity self - balancing device, 10. First slide bar, 11. Lower circular mounting plate, 12. Guide sleeve, 13. Moving seat, 14. Upper circular mounting plate, 15. Pressure cylinder, 16. First elastic member, 17. Piston rod, 18. Pressure sensor, 19. Rotation drive assembly, 20. Polishing motor, 21. Ball screw, 22. Lifting motor, 23. Female screw seat, 24. Linear guide rail, 25. Mounting disc, 26. Ball head seat, 27. Ball head fixing cover, 28. Ball head rod, 29. Pin, 30. Mounting and positioning surface, 31. Fixed groove, 32. Upper mounting seat, 33. Lower mounting seat, 34. Pneumatic and electrical integrated slip ring, 35. Stator, 36. Rotor, 37. Spline, 38. Limit block, 39. Second slide bar, 40. Second elastic member, 41. Rotating rod.

[0039] 42. Pressure control device. Detailed Description of the Invention

[0040] The following further describes in detail the implementation manners of the present invention in combination with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The present invention will be further described in detail below in combination with the embodiments of the accompanying drawings.

[0043] According to Figures 1 to 5, A polishing disc device on a double-sided polishing machine, comprising: a base 1 and a polishing assembly 2. The polishing assembly 2 includes a central rod 3, a polishing disc mounting assembly 4 and a polishing disc 5. The lower end of the longitudinally arranged central rod 3 is connected to the polishing disc 5 through the polishing disc mounting assembly 4; the rotation driving assembly 19 includes a polishing motor 20 for driving a rotating rod 41; the lifting assembly 6 includes a sliding plate 7, and mounting seats 8 are respectively arranged on the sliding plate 7 and are fixedly mounted on the outer wall of the base 1 in a vertically movable manner; the key improvement lies in that a gravity self-balancing device 9 and a pressure control device 42 for commonly connecting the polishing assembly 2 are arranged on the mounting seat 8. The gravity self-balancing device 9 has: four first sliding rods 10, which are evenly distributed horizontally in a circular manner, one end is fixed on the lower circular mounting plate 11, and the other end passes through the moving seat 13 and is slidably connected to the moving seat 13 and then connected to the upper circular mounting plate 14; the moving seat 13 is arranged between the upper circular mounting plate 14 and the lower circular mounting plate 11, the upper circular mounting plate 14, the lower circular mounting plate 11 and the central rod 3 are concentrically arranged, and the moving seat 13 is fixedly connected to the upper end of the central rod 3; a first elastic member 16 is sleeved on the outer wall of the central rod 3 and is distributed between the lower circular mounting plate 11 and the moving seat 13 to balance the weights of the polishing assembly 2 and the moving seat 13; the pressure control device 42 has: a pressure cylinder 15 is installed at the bottom of the upper circular mounting plate 14, and the lower end of its vertically movable piston rod 17 is in abutting cooperation with the moving seat 13, pushing the polishing disc 5 to move up and down and applying a polishing pressure; a second sliding rod 39 is arranged at the bottom of the piston rod 17, the second sliding rod 39 is slidably connected to the piston rod 17, and a second elastic member 40 is sleeved on the outer wall of the second sliding rod 39 to play a role of safety buffering to avoid the piston rod being overloaded with too much load. A pressure sensor 18 is arranged in a position where it can abut against the piston rod 17 of the pressure cylinder 15 and on the top of the moving seat 13 for measuring the polishing pressure and outputting a pressure signal; the signal input end of the controller is connected to the output end of the pressure sensor 18 to receive the output pressure signal. Correspondingly, the signal output end of the controller is connected to the control valve of the pressure cylinder 15, and the controller adjusts the polishing pressure according to the measured value, thereby realizing the precise measurement and control of the polishing pressure of the polishing disc 5.

[0044] The lifting assembly 6 further includes a ball screw 21, the ball screw 21 is connected to the bottom of a lifting motor 22 installed on the base 1, and a nut seat 23 that can move up and down is arranged on the ball screw 21, and the nut seat 23 is fixed on the side wall of the sliding plate 7. The lifting assembly 6 drives the sliding plate 7 to move up and down through the nut seat 23. A guiding mechanism is arranged between the base 1 and the sliding plate 7. At least one vertically distributed linear guide rail 24 is arranged on the outer wall of the base 1, preferably a pair of horizontally distributed linear guide rails 24. The sliding plate 7 is fixedly mounted on the linear guide rail 24 so as to be slidable up and down. In order to limit the sliding stroke of the sliding plate 7 and the base 1, a limiting block 38 is arranged on the top of the base 1 and is matched with the top of the sliding plate 7 to realize the limiting function.

[0045] The polishing disc mounting assembly 4 includes a mounting disc 25. The cross-section of the mounting disc 25 is T-shaped, and a mounting positioning surface 30 is provided at the bottom, which is matched with the fixing groove 31 at the top of the polishing disc 5 and is fixed by bolts. A ball head seat 26 is provided at the top of the mounting disc 25, and a ball head fixing cover 27 is fixed at the top of the ball head seat 26. There is a ball head rod 28 between the ball head seat 26 and the ball head fixing cover 27. The ball head rod 28 can freely move at a small angle with the ball head seat 26, ensuring that the polishing disc 5 and the lower polishing disc are always parallel during the processing, and avoiding the uncertainty during the processing. The lower section of the rod of the ball head rod 28 is connected to the ball head fixing cover 27 by a pin 29, and the upper section of the rod of the ball head rod 28 is detachably connected to the bottom of the central rod 3. This detachable connection adopts threaded connection or clamping connection with a polygonal hole. The central rod 3 adopts a spline rod, and a spline 37 is installed in a hole in the lower mounting seat 33, so that the spline rod is matched with the spline 37 through the spline groove and can be installed in the lower mounting seat 33 movably up and down. Finally, in order to rotate smoothly, the rotating rod 41, the pressure cylinder 15, the central rod 3, and the polishing disc 5 are arranged on the same central axis.

[0046] The rotation drive assembly 19 includes a polishing motor 20, an air-electricity integrated slip ring 34, and a rotating rod 41. The mounting seat 8 includes an upper mounting seat 32 and a lower mounting seat 33. The polishing motor 20 is provided at the top of the upper mounting seat 32. The bottom output shaft of the polishing motor 20 is connected to the upper end of the rotating rod 41. The rotating rod 41 passes through the upper mounting seat 32 through a bearing, so that the lower end of the rotating rod 41 is connected to the center of the upper circular mounting plate 14 in the gravity self-balancing device 9. The air-electricity integrated slip ring 34 is provided on the upper part of the rotating rod 41. The air-electricity integrated slip ring 34 has a stator 35 and a rotor 36, so that air and electricity are input from the fixed stator 35 and output from the rotating rotor 36, which is used for the air supply of the pressure cylinder 15 and the electrical signal connection of the pressure sensor 18.

[0047] During actual use, after the polishing disc 5 is selected according to the process requirements, the first elastic member 16 will deform under the influence of the gravity of the polishing disc 5, driving the moving seat 13 to descend along the first sliding rod 10 until the elastic force of the first elastic member 16 balances the gravity of the polishing disc 5 and its moving seat 13. Then, the lifting assembly 6 drives the upper polishing disc 5 to move into contact with the surface of the optical element. At this time, the polishing pressure on the element surface is zero, and the polishing pressure on the element surface during the processing will not be affected by the gravity of the polishing disc 5. After setting the polishing pressure, the piston rod 17 of the pressure cylinder 15 drives the second sliding rod 39 to move downward and contact the pressure sensor 18, causing the second elastic member 40 to deform. At this time, the pressure sensor 18 will detect a pressure value, which is equal to the polishing pressure on the element surface. During the polishing process, the controller adjusts the pressure of the pressure cylinder 15 according to the pressure value detected by the pressure sensor 18 to ensure pressure balance during the polishing process, which is consistent with the pre-designed polishing pressure. Then, the polishing motor 20 rotates, driving the gravity self-balancing device 9 to rotate through the rotating rod 41. The gravity self-balancing device 9 drives the central rod to rotate through the moving seat 13. The ball head rod 28 is connected to the central rod 3. The ball head of the ball head rod 28 is connected to the ball head seat 26 on the mounting disc 25 after passing through the ball head fixing cover 27. The ball head rod 28 and the ball head seat 26 can move freely at a small angle, ensuring that the polishing disc 5 is always parallel to the processing surface during the processing, avoiding the uncertainty during the processing. The central rod drives the mounting disc 25 to rotate through the ball head connecting rod, and the mounting disc 25 drives the polishing disc 5 to rotate, and is always parallel to the lower polishing disc during the rotation process, so as to polish the workpiece waiting for processing.

Claims

1. A polishing disc device for a double-sided polishing machine tool, comprising: a base; A polishing assembly, comprising a center rod, a polishing disc mounting assembly and a polishing disc, wherein the lower end of the longitudinally arranged center rod is connected to the polishing disc through the polishing disc mounting assembly; A rotary drive assembly including a polishing motor, a drive and a rotary rod; A lifting assembly includes a slide plate, each of which is provided with a mounting seat and is fixed on the outer wall of the base so as to be movable up and down; Features The mounting seat is provided with a gravity self-balancing device and a pressure control device which are connected to the polishing assembly. The gravity self-balancing device has: A plurality of first sliding rods are horizontally distributed, one end of which is fixed on the lower circular mounting plate, and the other end of which passes through the moving seat and is slidably connected to the moving seat and then connected to the upper circular mounting plate; A movable seat is arranged between the upper circular mounting plate and the lower circular mounting plate. The upper and lower circular mounting plates are arranged concentrically with the center rod. The movable seat is fixedly connected to the upper end of the center rod. A first elastic member is sleeved on the outer wall of the center rod and is distributed between the lower circular mounting plate and the movable seat to balance the weight of the polishing assembly and the movable seat. The pressure control device has: A pressure cylinder is installed at the bottom of the upper circular mounting plate, and the lower end of the piston rod that can move up and down is in abutment with the moving seat to push the polishing disc up and down and apply polishing pressure; A pressure sensor is arranged under the piston rod of the pressure cylinder and on the top of the moving seat to measure the polishing pressure and output a pressure signal; A controller, whose signal input end is connected to the output end of the pressure sensor, receives the output pressure signal, and correspondingly, executes the signal output end to connect the control valve of the pressure cylinder. The controller adjusts the polishing pressure according to the measured value, thereby realizing accurate measurement and control of the polishing pressure of the polishing disk.

2. A polishing disc device for a double-sided polishing machine according to claim 1, characterized in that The lifting assembly also includes a ball screw, which is connected to the bottom of the lifting motor installed on the base. The ball screw is provided with a mother seat that can move up and down, and the mother seat is fixed on the side wall of the slide.

3. A polishing disc device for a double-sided polishing machine according to claim 1, characterized in that A guide mechanism is provided between the base and the slide, at least one linear guide rail distributed up and down is provided on the outer wall of the base, the slide is fixed on the linear guide rail so as to slide up and down, and a limit block is provided on the top of the base to cooperate with the top of the slide to realize the limit function.

4. A polishing disc device for a double-sided polishing machine according to claim 1, characterized in that The polishing disc mounting assembly includes a mounting disc, a ball head seat is provided on the top of the mounting disc, a ball head fixing cover is fixed on the top of the ball head seat, a ball head rod is provided between the ball head seat and the ball head fixing cover, the lower section of the rod of the ball head rod and the ball head fixing cover are connected by a pin, and the upper section of the rod of the ball head rod is detachably connected to the bottom of the center rod.

5. A polishing disc device for a double-sided polishing machine according to claim 4, characterized in that The detachable connection is a threaded connection or a polygonal hole snap-on connection.

6. A polishing disc device for a double-sided polishing machine according to claim 4, characterized in that The installation plate has a T-shaped cross section, and a mounting positioning surface is provided at the bottom, which matches the fixing groove at the top of the polishing plate and is fixed by bolts.

7. The polishing disc device for a double-sided polishing machine according to claim 1, characterized in that The rotary drive assembly includes a polishing motor, an air-electric integrated slip ring and a rotating rod. The mounting seat includes an upper mounting seat and a lower mounting seat. The polishing motor is provided on the top of the upper mounting seat. The bottom output shaft of the polishing motor is connected to the upper end of the rotating rod. The rotating rod passes through the upper mounting seat through a bearing, so that the lower end of the rotating rod is connected to the center of the upper circular mounting plate in the gravity self-balancing device. A air-electric integrated slip ring is provided on the upper part of the rotating rod. The air-electric integrated slip ring has a stator and a rotor, so that air and electricity are input from the fixed stator and output from the rotating rotor, which is used for air and electricity supply of the pressure cylinder.

8. The polishing disc device for a double-sided polishing machine tool according to claim 7, characterized in that The center rod adopts a spline rod, a hole is opened in the lower mounting seat to install the spline, so that the spline rod cooperates with the spline through the spline groove and can be installed in the lower mounting seat movably up and down.

9. The polishing disc device for a double-sided polishing machine tool according to claim 1, characterized in that A second sliding rod is provided at the bottom of the piston rod. The second sliding rod is slidably connected to the piston rod, and a second elastic member is sleeved on the outer wall of the second sliding rod.

10. The polishing disc device for a double-sided polishing machine tool according to claim 1, characterized in that The rotating rod, the pressure cylinder, the center rod and the polishing disc are arranged on the same center axis.

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