Lifting platform capable of being automatically leveled for ultra-precision machining

Abstract

The utility model relates to an automatic leveling lifting platform for ultra-precision machining, which comprises a bottom plate, a driving lifting assembly and a carrying table, and the driving lifting assembly mounted on the bottom plate can drive the carrying table above to move in the vertical direction. The utility model aims to solve the problem that a traditional Z-axis lifting mechanism is low in rigidity, precision and motion stability, and provides a low-section lifting Z-axis for ultra-precision machining, which converts horizontal motion into lifting motion by utilizing a wedge block and has rigidity, precision and motion stability. And meanwhile, the flatness change of the whole breadth of the lifting platform in the moving process is also solved.

Description

Technical Field

[0001] The utility model relates to the technical field related to mechanical processing, in particular to a lifting platform capable of automatically leveling for ultra-precision processing. Background Art

[0002] With the continuous development of society and the continuous progress of science and technology, the machinery industry has also developed in the direction of specialization and precision. The application of high-precision equipment is wider and more comprehensive than before, especially in the field of laser fine processing. High-precision structure is the guarantee of the stability of laser processing technology. With the popularization of high-precision and high-efficiency laser processing methods, the high-precision development direction of the machinery industry is unstoppable.

[0003] At present, in the field of laser precision processing, there are equipment with extremely high requirements for optical path stability, such as laser high-precision drilling equipment. This type of equipment involves the problem of adjusting the height of the processing focus. The accuracy of the processing focus height adjustment is required to be sub-micron level, and high standards are also required for the flatness of the entire processing format. At the same time, during processing, higher requirements are also put forward for the in-position stability of the product and the stability during movement, that is, the rigidity of the lifting platform.

[0004] In summary, the problems existing in the prior art are:

[0005] The traditional Z-axis lifting mechanism is generally implemented by a servo motor driving a ball screw or belt and a linear guide. The ball screw or belt and the linear guide are arranged along the direction of movement, and the vertical Z-direction movement is achieved by the rotation of the servo motor. These cannot make the structure very compact, and the stability and accuracy during movement are relatively poor. The flatness of the entire format of the traditional Z-axis lifting mechanism is poor, usually at the sub-millimeter level, and the change in the entire format is unpredictable.

[0006] In view of the above-mentioned defects, the designers have actively carried out research and innovation in order to create a lifting platform that can automatically level for ultra-precision processing, so as to make it more valuable for industrial use. Utility Model Content

[0007] In order to solve any of the above technical problems, the purpose of the utility model is to provide an automatically leveling lifting platform for ultra-precision machining.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] An automatically leveling lifting platform for ultra-precision machining comprises a base plate, a driving lifting assembly and a carrier, wherein the driving lifting assembly installed on the base plate can drive the upper carrier to move in a vertical direction;

[0010] The driving lifting assembly includes a driving motor, a driven top plate and a wedge-shaped driving block. A vertical frame is installed on the bottom plate near the right side, and a driving motor is installed on the bottom plate on the right side of the vertical frame. The driving end on the left side of the driving motor is connected to the ball screw through a coupling, and the ball screw is connected to the wedge-shaped driving block on the left side of the vertical frame through a screw nut. The bottom of the wedge-shaped driving block moves along the left and right directions on the bottom plate through the first guide rail group below, and the second guide rail group is installed on the front and back sides of the left side of the vertical frame. The third guide rail group is installed on the front and back sides of the wedge-shaped driving block. The right side of the driven top plate moves along the vertical direction on the vertical frame through the second guide rail group, and the bottom of the driven top plate moves along the left and right directions on the wedge-shaped driving block through the third guide rail group, and a carrier is installed on the driven top plate.

[0011] As a further improvement of the utility model, sealing plates are installed on the bottom plate around the outer side of the driving lifting assembly.

[0012] As a further improvement of the utility model, a proximity sensor is installed at the front side of the frame, and a sensing piece compatible with the proximity sensor is installed on the driven top plate on one side of the proximity sensor; a linear encoder is installed at the rear side of the frame, and a grating scale distributed along the vertical direction and compatible with the linear encoder is installed on the driven top plate on one side of the linear encoder.

[0013] As a further improvement of the utility model, a plurality of laser coaxial displacement meters and linear actuators are installed on the driven top plate.

[0014] As a further improvement of the present utility model, the number of the laser coaxial displacement meter and the number of the linear actuator are both three.

[0015] As a further improvement of the utility model, an inclined first contact surface is provided on the wedge-shaped driving block, and an inclined second contact surface is provided at the bottom of the driven top plate, and the first contact surface is matched with the second contact surface above.

[0016] As a further improvement of the utility model, buffer seats are installed on the bottom plates on both sides of the wedge-shaped driving block along the left and right directions, and buffers are installed on the buffer seats to buffer the upper limit of the wedge-shaped driving block in the left and right directions.

[0017] As a further improvement of the present invention, the first guide rail set is a roller linear guide rail.

[0018] As a further improvement of the utility model, the second guide rail set is a roller guide rail.

[0019] As a further improvement of the present invention, the third guide rail set is a roller guide rail.

[0020] By means of the above solution, the utility model has at least the following advantages:

[0021] The utility model aims to solve the problems of low rigidity, precision and movement stability of traditional Z-axis lifting mechanisms and proposes a low-section lifting Z-axis for ultra-precision machining that utilizes a wedge block to convert horizontal motion into lifting motion and has both rigidity, precision and movement stability. At the same time, it also solves the change in flatness of the entire surface of the lifting platform during movement.

[0022] The utility model adopts a high-rigidity and high-precision roller linear guide rail group for guiding in the horizontal direction, and adopts a high-rigidity roller guide rail group in the vertical and oblique directions to reduce the cross-section and improve the rigidity.

[0023] The utility model introduces three groups of miniature high-precision linear actuators and laser coaxial displacement meters to automatically and in real time adjust the horizontal format of the lifting platform after movement, thereby improving the consistency of the laser processing focus and eliminating the tedious work of manually adjusting the horizontal format.

[0024] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a structural schematic diagram of an automatic leveling lifting platform for ultra-precision machining of the utility model;

[0027] Figure 2 yes Figure 1 The schematic diagram of the structure after the sealing plate and the carrier are removed;

[0028] Figure 3 yes Figure 2 The schematic diagram of the structure after the driven top plate is removed;

[0029] Figure 4 yes Figure 3 Schematic diagram of the structure on the other side.

[0030] The meanings of the various reference numerals in the figures are as follows.

[0031] Base plate 1, sealing plate 2, driving motor 3, carrier 4, stand 5, driven top plate 6, proximity sensor 7, sensing sheet 8, laser coaxial displacement meter 9, linear actuator 10, linear encoder 11, ball screw 12, first guide rail group 13, wedge-shaped driving block 14, second guide rail group 15, third guide rail group 16, buffer seat 17, buffer 18. DETAILED DESCRIPTION

[0032] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] In order to make the technical personnel in the technical field better understand the scheme of the utility model, the technical scheme in the embodiment of the utility model will be clearly and completely described below in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, rather than all the embodiments. The components of the embodiment of the utility model usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model for protection, but only represents the selected embodiment of the utility model. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the utility model.

[0034] like Figure 1 to Figure 4 As shown, the automatically leveling lifting platform for ultra-precision machining includes a base plate 1, a driving lifting assembly and a carrier 4. The driving lifting assembly installed on the base plate 1 can drive the upper carrier 4 to move in the vertical direction. Closing plates 2 are installed on the base plate 1 around the outer side of the driving lifting assembly.

[0035] The driving lifting assembly includes a driving motor 3, a driven top plate 6 and a wedge-shaped driving block 14. A stand 5 is installed on the bottom plate 1 near the right side. A driving motor 3 is installed on the bottom plate 1 on the right side of the stand 5. The driving end of the left side of the driving motor 3 is connected to the ball screw 12 through a coupling. The ball screw 12 is connected to the wedge-shaped driving block 14 located on the left side of the stand 5 through a screw nut. The bottom of the wedge-shaped driving block 14 moves along the left and right directions on the bottom plate 1 through the first guide rail group 13 below. The second guide rail group 15 is installed on the front and back sides of the left side of the stand 5. The third guide rail group 16 is installed on the front and back sides of the wedge-shaped driving block 14. The right side of the driven top plate 6 moves along the vertical direction on the stand 5 through the second guide rail group 15. The bottom of the driven top plate 6 moves along the left and right directions on the wedge-shaped driving block 14 through the third guide rail group 16. A carrier 4 is installed on the driven top plate 6.

[0036] The first guide rail set 13 is a roller linear guide rail, the second guide rail set 15 is a roller guide rail, and the third guide rail set 16 is a roller guide rail.

[0037] An inclined first contact surface is provided on the wedge-shaped driving block 14 , and an inclined second contact surface is provided at the bottom of the driven top plate 6 , and the first contact surface is matched with the second contact surface above.

[0038] Buffer seats 17 are installed on the bottom plate 1 on both sides of the wedge-shaped driving block 14 in the left-right direction. Buffers 18 are installed on the buffer seats 17 to buffer the upper limit of the wedge-shaped driving block 14 in the left-right direction.

[0039] A proximity sensor 7 is installed at the front side of the stand 5, and a sensing piece 8 compatible with the proximity sensor 7 is installed on the driven top plate 6 on one side of the proximity sensor 7; a linear encoder 11 is installed at the rear side of the stand 5, and a grating scale distributed along the vertical direction and compatible with the linear encoder 11 is installed on the driven top plate 6 on one side of the linear encoder 11.

[0040] A plurality of laser coaxial displacement meters 9 and linear actuators 10 are installed on the driven top plate 6 , and the number of the laser coaxial displacement meters 9 and the number of the linear actuators 10 are both three.

[0041] The positional relationship and connection relationship between the components of the utility model:

[0042] The sealing plate 2 is connected to the base plate 1 by screws for anti-pinch and dust prevention; the buffer 18 passes through the threaded hole of the buffer seat 17 and is locked by a hexagonal nut and then connected to the base plate 1 by screws for hard limit; the drive motor 3 and the ball screw 12 are connected by a coupling; the first guide rail group 13 is fixed to the base plate 1 by screws for guiding; the driven top plate 6 is connected to the wedge-shaped driving block 14 through the second guide rail group 15 and the third guide rail group 16; the carrier 4 is fixed to the driven top plate 6 by screws; the sensing sheet 8 is fixed to the driven top plate 6; the linear actuator 10 and the laser coaxial displacement meter 9 are fixed to the driven top plate 6; the linear actuator 10 is flexibly connected to the carrier 4; the proximity sensor 7 is fixed to the stand 5.

[0043] The working principle and working process of this utility model:

[0044] The driving motor 3 drives the ball screw 12 to move the wedge-shaped driving block 14 in the horizontal direction under the guidance of the first guide rail group 13. The wedge-shaped driving block 14 drives the driven top plate 6 to move in the vertical Z direction under the guidance and constraint of the oblique second guide rail group 15 and the third guide rail group 16. The proximity sensor 7 limits the distance of up and down movement by sensing the position of the sensing piece 8. The linear encoder 11 reads the current height value and feeds it back to the main control driver. The internal value of the driver of the driving motor 3 is also fed back to the main control driver. The data of the two are compared by the internal algorithm to compensate the current height value to achieve higher positioning accuracy and repeatability. After each lifting platform movement is completed, the three groups of laser coaxial displacement meters 9 calculate the difference in the three-point values ​​and feed them back to the main control driver to control the linear actuator 10 to automatically adjust the level of the entire format. Among them, the working structure and working principle of the above-mentioned laser coaxial displacement meter 9, linear actuator 10, linear encoder 11 and main control driver are conventional technical contents in the prior art, and no unnecessary elaboration is made in this article.

[0045] The utility model converts the horizontal movement of the wedge-shaped drive block into the vertical movement of the driven top plate and the carrier through a newly designed geometric structure, thus solving the problem that the traditional Z-axis structure is not compact enough. It also adopts a mature and reliable high-rigidity rolling guide rail group for guidance, which improves the rigidity of the entire lifting platform during the lifting process and ensures that the accuracy will not be reduced due to wear during the entire service life. The utility model introduces a high-precision laser coaxial displacement meter and a linear actuator for automatic leveling, and the entire carrier format maintains a sub-micron level within the travel range, making the invention more widely used in industries that require more precision.

[0046] The utility model aims to solve the problems of low rigidity, precision and movement stability of traditional Z-axis lifting mechanisms and proposes a low-section lifting Z-axis for ultra-precision machining that utilizes a wedge block to convert horizontal motion into lifting motion and has both rigidity, precision and movement stability. At the same time, it also solves the change in flatness of the entire surface of the lifting platform during movement.

[0047] The utility model adopts a high-rigidity and high-precision roller linear guide rail group for guiding in the horizontal direction, and adopts a high-rigidity roller guide rail group in the vertical and oblique directions to reduce the cross-section and improve the rigidity.

[0048] The utility model introduces three groups of miniature high-precision linear actuators and laser coaxial displacement meters to automatically and in real time adjust the horizontal format of the lifting platform after movement, thereby improving the consistency of the laser processing focus and eliminating the tedious work of manually adjusting the horizontal format.

[0049] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0050] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, it can be an electrical connection, it can be a direct connection, it can be an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. An automatically leveling lifting platform for ultra-precision machining, comprising a base plate (1), a driving lifting assembly and a carrier (4), wherein the driving lifting assembly mounted on the base plate (1) can drive the carrier (4) above to move in a vertical direction; Features: The driving lifting assembly comprises a driving motor (3), a driven top plate (6) and a wedge-shaped driving block (14); a stand (5) is installed on the bottom plate (1) near the right side; a driving motor (3) is installed on the bottom plate (1) on the right side of the stand (5); a driving end on the left side of the driving motor (3) is connected to a ball screw (12) through a coupling; the ball screw (12) is connected to a wedge-shaped driving block (14) located on the left side of the stand (5) through a screw nut; the bottom of the wedge-shaped driving block (14) is connected to the bottom of the first guide rail through the bottom The guide rail group (13) moves along the left and right directions on the bottom plate (1), the second guide rail group (15) is installed on the front and rear sides of the left side of the vertical frame (5), and the third guide rail group (16) is installed on the front and rear sides of the wedge-shaped driving block (14). The right side of the driven top plate (6) moves along the vertical direction on the vertical frame (5) through the second guide rail group (15), and the bottom of the driven top plate (6) moves along the left and right directions on the wedge-shaped driving block (14) through the third guide rail group (16), and the carrier (4) is installed on the driven top plate (6).

2. The automatic leveling lifting platform for ultra-precision machining according to claim 1, characterized in that: Sealing plates (2) are installed on the bottom plate (1) around the outer sides of the driving lifting assembly.

3. The automatic leveling lifting platform for ultra-precision machining according to claim 1, characterized in that: A proximity sensor (7) is installed at the front side of the stand (5), and a sensing piece (8) compatible with the proximity sensor (7) is installed on the driven top plate (6) on one side of the proximity sensor (7); a linear encoder (11) is installed at the rear side of the stand (5), and a grating scale distributed along the vertical direction and compatible with the linear encoder (11) is installed on the driven top plate (6) on one side of the linear encoder (11).

4. The automatic leveling lifting platform for ultra-precision machining according to claim 1, characterized in that: A plurality of laser coaxial displacement meters (9) and linear actuators (10) are installed on the driven top plate (6).

5. The automatic leveling lifting platform for ultra-precision machining according to claim 4, characterized in that: The number of the laser coaxial displacement meters (9) and the number of the linear actuators (10) are both three.

6. The automatic leveling lifting platform for ultra-precision machining according to claim 1, characterized in that: An inclined first contact surface is arranged on the wedge-shaped driving block (14), and an inclined second contact surface is arranged at the bottom of the driven top plate (6), wherein the first contact surface is matched with the second contact surface above.

7. The automatic leveling lifting platform for ultra-precision machining according to claim 1, characterized in that: Buffer seats (17) are installed on the bottom plates (1) on both sides of the wedge-shaped driving block (14) in the left and right directions, and buffers (18) are installed on the buffer seats (17) for buffering the upper limit of the wedge-shaped driving block (14) in the left and right directions.

8. The automatic leveling lifting platform for ultra-precision machining according to claim 1, characterized in that: The first guide rail group (13) is a roller linear guide rail.

9. The automatic leveling lifting platform for ultra-precision machining according to claim 1, characterized in that: The second guide rail group (15) is a roller guide rail.

10. The automatic leveling lifting platform for ultra-precision machining according to claim 1, characterized in that: The third guide rail group (16) is a roller guide rail.

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