High-precision vertical shaft feeding lifting mechanism

Abstract

The high-precision vertical shaft feeding lifting mechanism comprises a base, telescopic columns are fixedly connected to the four corners of the upper end face of the base correspondingly, a top plate is fixedly connected to the upper end faces of the telescopic columns, and limiting rods are fixedly connected to the left side and the right side of the transverse central axis of the upper end face of the base correspondingly; sliding devices are arranged on the left side and the right side of the transverse central axis of the end face of the top plate correspondingly, a servo motor is fixedly connected to the upper end face of the base, a lead screw is fixedly connected to the upper end face of a motor shaft of the servo motor, the lead screw is sleeved with a static pressure sleeve, and the upper portion of the left side of the static pressure sleeve is fixedly communicated with an air inlet pipe. The device is simple in structure and convenient to operate, and the lifting precision of the machining platform is effectively improved.

Description

Technical Field

[0001] The present disclosure specifically discloses a technical field of ultra-precision machining equipment, and in particular relates to a high-precision vertical axis feeding and lifting mechanism. Background Art

[0002] With the development of ultra-precision machining and manufacturing technology, many high-tech products have increasingly higher requirements for the machining accuracy of ultra-precision machining machines. The ultra-precision linear motion platform is an important executive component for ultra-precision machine tools to achieve high machining accuracy, and its performance determines the machining performance of the entire machine tool to a certain extent. The machining of optical components such as free-form surfaces and microstructures based on mechanical cutting methods has the advantages of high machining efficiency, low cost and a wide range of machining materials. The machining of complex free-form surfaces and microstructures often requires the use of a vertical axis feed and lifting mechanism. However, because the movement direction of the ultra-precision vertical linear axis is parallel to the direction of gravity and is affected by the gravitational field, its load conditions are more stringent than those of the horizontal linear axis, and it is more difficult to achieve high-precision verticality;

[0003] According to the application number 201910555027.X, a high-precision vertical axis feed lifting mechanism is disclosed, including a base, a servo motor, a lead screw and a hydrostatic nut pair, a plurality of evenly distributed throttle holes are provided on the hydrostatic nut pair, the outlet of the throttle hole is located at the position where the hydrostatic nut pair and the lead screw mesh, and a high-pressure gas is introduced into the throttle hole to form an air film at the position where the teeth mesh;

[0004] In the existing lifting mechanism of the machining platform, the drive device, the changes in external load and motion conditions will directly act on the motor, causing the linear motor servo system to oscillate violently, so that the stability of the system is reduced. The lack of a support device leads to the instability of the platform, and the existing limit device is prone to large friction with the limit port, causing the machining platform to tremble slightly, resulting in a decrease in machining accuracy. For this reason, we propose a high-precision vertical axis feed lifting mechanism. Summary of the invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, the present application aims to provide a sliding device and a stable supporting structure.

[0006] A high-precision vertical axis feed lifting mechanism comprises a base, wherein the four corners of the upper end surface of the base are fixedly connected with telescopic columns, the upper end surface of the telescopic columns is fixedly connected with a top plate, the left and right sides of the transverse central axis of the upper end surface of the base are fixedly connected with limit rods, the upper ends of the limit rods extend through and extend to the upper part of the top plate, and sliding devices are arranged on the left and right sides of the transverse central axis of the end surface of the top plate, the upper end surface of the base is fixedly connected with a servo motor, the upper end surface of the motor shaft of the servo motor is fixedly connected with a screw, a static pressure sleeve is sleeved on the outside of the screw, the upper end surface of the static pressure sleeve is fixedly connected to the center of the lower end surface of the top plate, the upper left side of the static pressure sleeve is fixedly connected to an air inlet pipe, the upper right side of the static pressure sleeve is fixedly connected to an air outlet pipe, and the ends of the air inlet pipe and the air outlet pipe are fixedly connected with ventilation joints.

[0007] According to the technical solution provided in the embodiment of the present application, the static pressure sleeve includes a sleeve, a through hole and a first thread. The sleeve is fixedly connected at the center of the lower end surface of the top plate, the first thread is fixedly connected to the inner wall of the inner cavity of the sleeve, and through holes are evenly opened on the upper part of the first thread, and the through holes extend from the top to the lower part of the first thread.

[0008] According to the technical solution provided in the embodiment of the present application, the screw rod includes a fixed column and a second thread, the upper end surface of the motor shaft of the servo motor is fixedly connected with the fixed column, the outer wall of the fixed column is provided with a second thread, and the second thread cooperates with the first thread.

[0009] According to the technical solution provided in the embodiment of the present application, the sliding device includes a limit opening, a roller and a connecting seat. The limit opening is opened on both sides of the left and right sides of the central transverse axis of the end face of the top plate. The left and right end faces of the inner cavity of the limit opening are fixedly connected with the connecting seat. The inner cavity of the connecting seat is movably connected with the roller. The outer wall of the roller is away from one end face and respectively fits the left and right end faces of the limit rod.

[0010] According to the technical solution provided in the embodiment of the present application, grooves are evenly opened on the left and right sides of the upper end surface of the top plate, the grooves are connected to the limit openings, the upper end surfaces of the limit rods are fixedly connected to the limit plates, and the limit plates match the grooves.

[0011] According to the technical solution provided in the embodiment of the present application, a sealing box is arranged outside the servo motor, and heat dissipation holes are evenly opened on the left and right end surfaces of the sealing box.

[0012] In summary, the present application discloses a high-precision vertical axis feed lifting mechanism.

[0013] Beneficial effects:

[0014] 1. Through the limit rod and the sliding device, the limit rod has a limiting function to ensure that the top plate can be lifted and lowered stably. Through the cooperation of the sliding device, it is avoided that the limit port and the limit rod are stuck or have large friction to cause vibration, resulting in a reduction in the lifting accuracy of the top plate, thereby reducing the processing accuracy.

[0015] 2. Through the telescopic column, screw, static pressure sleeve, air inlet pipe, air outlet pipe and through hole, the screw and static pressure sleeve cooperate to drive the top plate to rise and fall stably. Due to the high axial stiffness and high bearing capacity of the screw, the problems of small locking force of the motor in the vertical direction and large size of the mechanism are overcome. The gas enters the inner cavity of the sleeve, which effectively reduces the friction during operation. Combined with the high-precision servo motor, the precise lifting and lowering control of the workbench is realized, and nanometer-level positioning accuracy can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0017] Figure 1 It is a schematic diagram of the vertical axis feed lifting mechanism in this application;

[0018] Figure 2 It is a schematic diagram of the top view of the vertical shaft feeding and lifting mechanism in this application;

[0019] Figure 3 It is a schematic diagram of the cross-sectional structure of the vertical axis feed lifting mechanism in this application.

[0020] In the figure: 1. base; 2. telescopic column; 3. top plate; 4. limit rod; 5. limit plate; 6. sliding device; 61. limit port; 62. roller; 63. connecting seat; 7. servo motor; 8. static pressure sleeve; 81. sleeve; 82. through hole; 83. first thread; 9. screw rod; 91. fixing column; 92. second thread; 10. air inlet pipe; 11. air outlet pipe; 12. ventilation joint; 13. groove; 14. sealing box. DETAILED DESCRIPTION

[0021] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] As mentioned in the background technology, with respect to the driving device in the lifting mechanism of the processing platform in the prior art, changes in its external load and motion conditions will directly act on the driving device, causing the servo system of the driving device to oscillate violently, so that the stability of the system is reduced. The lack of a supporting device leads to the instability of the platform, and the existing limit device is prone to large friction with the limit port, causing the processing platform to tremble slightly, resulting in a decrease in processing accuracy. The present disclosure proposes a structure with a sliding device and a stable support.

[0024] Example 1

[0025] See also Figure 1 A high-precision vertical axis feed lifting mechanism includes a base 1, telescopic columns 2 are fixedly connected at the four corners of the upper end surface of the base 1, a top plate 3 is fixedly connected to the upper end surface of the telescopic columns 2, and the upper end surfaces of the four groups of telescopic columns 2 are respectively fixedly connected to the four corners of the lower end surface of the top plate 3, effectively ensuring the stability of the top plate 3. In order to ensure that the top plate 3 can be stably lifted and lowered, limit rods 4 are fixedly connected on both sides of the transverse center axis of the upper end surface of the base 1, and the upper end of the limit rod 4 extends through and extends to the upper part of the top plate 3, and sliding devices 6 are arranged on both sides of the transverse center axis of the end surface of the top plate 3 to ensure that the top plate 3 can be smoothly lifted and lowered.

[0026] See also Figure 1 In order to ensure that the top plate 3 can be lifted and lowered normally, a servo motor 7 is fixedly connected to the upper end surface of the base 1, a screw rod 9 is fixedly connected to the upper end surface of the motor shaft of the servo motor 7, a static pressure sleeve 8 is sleeved on the outside of the screw rod 9, and the upper end surface of the static pressure sleeve 8 is fixedly connected to the center of the lower end surface of the top plate 3 to ensure the stability of the static pressure sleeve 3, and an air inlet pipe 10 is fixedly connected to the upper left side of the static pressure sleeve 8, and an air outlet pipe 11 is fixedly connected to the upper right side of the static pressure sleeve 8, and ventilation joints 12 are fixedly connected to the ends of the air inlet pipe 10 and the air outlet pipe 11.

[0027] See also Figure 3 In order to ensure that the sleeve 81 can be raised and lowered, thereby driving the top plate 3 to be raised and lowered, a static pressure sleeve 8 is formed by the sleeve 81, the through hole 82 and the first thread 83. The sleeve 81 is fixedly connected to the center of the lower end surface of the top plate 3, and the first thread 83 is fixedly connected to the inner wall of the inner cavity of the sleeve 81. In order to ensure that air enters between the first thread 83 and the second thread 92, through holes 82 are evenly opened on the upper part of the first thread 83, and the through holes 82 extend from the top to the lower part of the first thread 83, ensuring that air completely enters between the first thread 83 and the second thread 92.

[0028] See also Figure 3In order to ensure that the sleeve 81 can be lifted and lowered normally without rotating, a driving device is required at the lower part. The screw rod 9 is formed by a fixed column 91 and a second thread 92. The fixed column 91 is fixedly connected to the upper end surface of the motor shaft of the servo motor 7. The second thread 92 is provided on the outer wall of the fixed column 91, and the second thread 92 cooperates with the first thread 83 to ensure that the static pressure sleeve 8 is threadedly connected to the screw rod 9.

[0029] See also Figure 2 In order to ensure that the top plate 3 can be lifted and lowered smoothly without friction between the limit rod 4 and the limit opening 61, a sliding device 6 is formed by the limit opening 61, the roller 62 and the connecting seat 63. The limit opening 61 is opened on both sides of the left and right sides of the central transverse axis of the end face of the top plate 3, and the left and right end faces of the inner cavity of the limit opening 61 are fixedly connected with the connecting seat 63, and the roller 62 is movably connected with the inner cavity of the connecting seat 63, and the outer wall of the roller 62 is away from one end face and respectively fits the left and right end faces of the limit rod 4.

[0030] See also Figure 2 In order to ensure that the limit rod 4 will not separate from the limit opening 61, grooves 13 are evenly opened on the left and right sides of the upper end surface of the top plate 3, and the grooves 13 are connected to the limit opening 61. The upper end surface of the limit rod 4 is fixedly connected with a limit plate 5, and the limit plate 5 matches the groove 13 to ensure that the top plate 3 rises to the highest point and the upper end surface of the top plate 3 is horizontal.

[0031] Example 2

[0032] See also Figure 3 In order to ensure that the servo motor 7 can operate normally, a sealing box 14 is arranged outside the servo motor 7. Heat dissipation holes are evenly opened on the left and right end surfaces of the sealing box 14, and the heat dissipation holes are inclined outward to ensure that rainwater and dust will not enter.

[0033] Working principle: When in use, use an external power connection to start the servo motor 7, and the servo motor 7 drives the screw rod 9 to rotate. Through the cooperation of the limit rod 4 and the limit opening 61, the roller 62 fits the left and right outer walls of the limit rod 4 to ensure that the top plate 3 will not vibrate or get stuck when it is lifted. The telescopic rod fixes the top plate 3 stably, and the screw rod 9 rotates, driving the static pressure sleeve 8 to rise and fall outside the screw rod 9. By inputting gas into the air inlet pipe 10, the gas passes through the inside of the sleeve 81 and enters between the first thread 83 and the second thread 92 through the through hole 82. Since the mechanical parts are separated by an air film, direct contact of the mechanical parts is avoided, which effectively reduces the friction during operation. Combined with a high-precision servo motor, the precise lifting and lowering control of the workbench is realized, and nanometer-level positioning accuracy can be achieved.

[0034] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A high-precision vertical axis feed lifting mechanism, comprising a base (1), characterized in that: The four corners of the upper end surface of the base (1) are fixedly connected with telescopic columns (2), the upper end surface of the telescopic columns (2) is fixedly connected with a top plate (3), the upper end surface of the base (1) is fixedly connected with limit rods (4) on both sides of the transverse central axis, the upper end of the limit rod (4) extends through and extends to the upper part of the top plate (3), the upper end of the top plate (3) is provided with sliding devices (6) on both sides of the transverse central axis, the upper end surface of the base (1) is fixedly connected with a servo motor (7), the A screw rod (9) is fixedly connected to the upper end face of the motor shaft of the servo motor (7), and a static pressure sleeve (8) is sleeved on the outside of the screw rod (9). The upper end face of the static pressure sleeve (8) is fixedly connected to the center of the lower end face of the top plate (3). The upper left side of the static pressure sleeve (8) is fixedly connected to an air inlet pipe (10), and the upper right side of the static pressure sleeve (8) is fixedly connected to an air outlet pipe (11). The ends of the air inlet pipe (10) and the air outlet pipe (11) are fixedly connected to ventilation joints (12).

2. The high-precision vertical axis feeding and lifting mechanism according to claim 1, characterized in that: The static pressure sleeve (8) comprises a sleeve (81), a through hole (82) and a first thread (83); the sleeve (81) is fixedly connected at the center of the lower end surface of the top plate (3); the inner wall of the inner cavity of the sleeve (81) is fixedly connected to the first thread (83); the through holes (82) are evenly opened on the upper part of the first thread (83), and the through holes (82) extend from the top to the lower part of the first thread (83).

3. The high-precision vertical axis feeding and lifting mechanism according to claim 2, characterized in that: The screw rod (9) comprises a fixed column (91) and a second thread (92); the upper end surface of the motor shaft of the servo motor (7) is fixedly connected with the fixed column (91); the outer wall of the fixed column (91) is provided with a second thread (92); the second thread (92) matches the first thread (83).

4. The high-precision vertical axis feeding and lifting mechanism according to claim 1, characterized in that: The sliding device (6) comprises a limiting opening (61), a roller (62) and a connecting seat (63); the limiting opening (61) is provided on both left and right sides of the central transverse axis of the end face of the top plate (3); the connecting seat (63) is fixedly connected to the left and right end faces of the inner cavity of the limiting opening (61); the roller (62) is movably connected to the inner cavity of the connecting seat (63); and the outer wall of the roller (62) is respectively in contact with the left and right end faces of the limiting rod (4) at one end face away from the other.

5. The high-precision vertical axis feeding and lifting mechanism according to claim 4, characterized in that: The upper end surface of the top plate (3) is evenly provided with grooves (13) on both sides, the grooves (13) are connected to the limit opening (61), the upper end surface of the limit rod (4) is fixedly connected to the limit plate (5), and the limit plate (5) matches the grooves (13).

6. The high-precision vertical axis feeding and lifting mechanism according to claim 1, characterized in that: A sealing box (14) is arranged outside the servo motor (7), and heat dissipation holes are evenly opened on the left and right end surfaces of the sealing box (14).

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