Differential type precision displacement platform

Abstract

The invention relates to the technical field of precision displacement platforms, in particular to a differential type precision displacement platform. According to the technical scheme, the device comprises a rack, and further comprises a coarse adjustment workbench and a precision workbench which are installed on the rack in a sliding mode, a differential fine adjustment assembly which drives the coarse adjustment workbench and the precision workbench to synchronously move in the same direction in a differential mode, and a coarse adjustment displacement mechanism which drives the fine adjustment workbench and the precision workbench to move in the same direction in a differential mode. And the coarse adjustment displacement mechanism drives the coarse adjustment workbench and the precise workbench to quickly move on the rack. Through combined use of the differential fine adjustment assembly and the coarse adjustment displacement mechanism, the problem that the adjustment speed is low due to the fact that the adjustment stroke of fine adjustment is small can be solved, and rapid adjustment is achieved by adopting a large-lead lead screw through the coarse adjustment displacement mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of precision displacement platforms, and in particular to a differential precision displacement platform. Background Art

[0002] The differential precision displacement stage is a mechanical device that uses the differential screw principle to achieve high-precision displacement control. Through the special thread design of the differential screw, it can achieve tiny and precise displacement adjustment without changing the rotation direction.

[0003] However, the smaller the lead of the screw, the higher the adjustment accuracy. In order to improve the adjustment accuracy, a screw with a smaller lead is generally used. However, a smaller adjustment stroke will result in a slow adjustment speed, which is not conducive to the rapid adjustment of the platform. Summary of the invention

[0004] The purpose of the present invention is to propose a differential precision displacement platform in view of the problems existing in the background technology.

[0005] The technical solution of the present invention is a differential precision displacement platform, comprising a frame and further comprising:

[0006] Coarse adjustment table and precision table slidably mounted on the frame;

[0007] A differential fine adjustment component, wherein the differential fine adjustment component drives the coarse adjustment workbench and the precision workbench to move synchronously at differential speeds in the same direction;

[0008] A coarse adjustment displacement mechanism drives the coarse adjustment workbench and the precision workbench to move quickly on the frame.

[0009] Optionally, the differential fine adjustment assembly includes a differential screw, and both ends of the differential screw are threadedly connected to the coarse adjustment workbench and the precision workbench respectively.

[0010] Optionally, the differential screw is provided with a first thread line and a second thread line, the first thread line is threadedly connected to the precision workbench, the second thread line is threadedly connected to the coarse adjustment workbench, and the pitch of the first thread line is greater than that of the second thread line.

[0011] Optionally, the differential fine adjustment component further includes a floating motor seat slidably mounted on the frame, a first motor is fixedly mounted on the floating motor seat, and an output shaft of the first motor is coaxially and fixedly connected to the differential screw rod.

[0012] Optionally, the coarse adjustment displacement mechanism includes a second motor fixedly mounted on the frame, a coarse adjustment lead screw is fixedly mounted on the output shaft of the second motor, and the coarse adjustment lead screw is threadedly connected to the coarse adjustment workbench.

[0013] Optionally, a lens mount is threadedly connected to the first thread line, and a lens is fixedly mounted on the lens mount; and a connecting seat is threadedly connected to the second thread line, and a stage is fixedly mounted on the connecting seat.

[0014] Optionally, a first guide rod and a second guide rod are fixedly mounted on the frame, the first guide rod is slidably connected to the lens seat, and the second guide rod is slidably connected to the connecting seat.

[0015] In summary, the present application includes at least one of the following beneficial technical effects:

[0016] The present invention uses a differential screw to make the relative movement of the two equal to the lead difference. The smaller the lead difference, the higher the precision. Different loads can be solved by using different screw diameters and larger leads with large load-bearing capacity, which can solve the contradiction between precision and load-bearing capacity and achieve high precision at low cost.

[0017] Furthermore, by combining the differential fine adjustment component and the coarse adjustment displacement mechanism, the problem of slow adjustment speed caused by a small fine adjustment stroke can be prevented. By using a larger lead screw in the coarse adjustment displacement mechanism, rapid adjustment can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structural schematic diagram of the differential precision displacement platform is given;

[0019] Figure 2 It is a structural schematic diagram of the differential screw rod of the present invention;

[0020] Figure 3 The structural intent of the differential screw in the field of optical precision focusing is given.

[0021] Figure numerals: 1, coarse adjustment workbench; 101, precision workbench; 2, differential screw; 201, first thread line; 202, second thread line; 3, floating motor seat; 301, first motor; 4, second motor; 401, coarse adjustment screw; 5, lens seat; 501, first guide rod; 502, lens; 6, connecting seat; 601, second guide rod; 602, stage. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Embodiment 1, as Figure 1 to Figure 2As shown, a differential precision displacement platform proposed by the present invention includes a frame, a coarse adjustment table 1 and a precision table 101 slidably mounted on the frame, and a differential fine adjustment component, the differential fine adjustment component drives the coarse adjustment table 1 and the precision table 101 to move synchronously and differentially in the same direction. The differential fine adjustment component includes a differential screw 2, and the two ends of the differential screw 2 are respectively threadedly connected to the coarse adjustment table 1 and the precision table 101. When the differential screw rotates, it will drive the coarse adjustment table 1 and the precision table 101 to perform linear motion.

[0024] Furthermore, the differential screw 2 is provided with a first thread line 201 and a second thread line 202, the first thread line 201 is threadedly connected to the precision workbench 101, the second thread line 202 is threadedly connected to the coarse adjustment workbench 1, and the pitch of the first thread line 201 is greater than that of the second thread line 202. When the differential screw rotates, due to the difference in pitch between the first thread line 201 and the second thread line 202, the coarse adjustment workbench 1 and the precision workbench 101 matched with the first thread line 201 and the second thread line 202 will move at different speeds or distances, thereby causing a differential effect in the relative movement of the coarse adjustment workbench 1 and the precision workbench 101. The differential effect allows fine displacement control to be achieved by adjusting the relative speed of the two sections of thread without changing the direction of rotation.

[0025] The differential fine adjustment component also includes a floating motor seat 3 slidably mounted on the frame, a first motor 301 is fixedly mounted on the floating motor seat 3, and an output shaft of the first motor 301 is coaxially fixedly connected with the differential screw 2. The first motor 301 drives the differential screw 2 to rotate, so that the coarse adjustment workbench 1 and the precision workbench 101 can be precisely adjusted.

[0026] The present embodiment also includes a coarse adjustment displacement mechanism, which drives the coarse adjustment workbench 1 and the precision workbench 101 to move rapidly on the frame. The coarse adjustment displacement mechanism includes a second motor 4 fixedly mounted on the frame, and a coarse adjustment screw 401 is fixedly mounted on the output shaft of the second motor 4, and the coarse adjustment screw 401 is threadedly connected to the coarse adjustment workbench 1. Starting the second motor 4 can drive the coarse adjustment screw 401 to rotate, and the rotating coarse adjustment screw 401 will drive the coarse adjustment workbench 1 to move, and the precision workbench 101 can be driven to move rapidly through the differential screw 2, thereby realizing rapid adjustment of the coarse adjustment workbench 1 and the precision workbench 101.

[0027] In this embodiment, the differential screw 2 is driven to rotate by the first motor 301. When the differential screw rotates, due to the difference in pitch between the first thread line 201 and the second thread line 202, the coarse adjustment table 1 and the precision table 101 matched with the first thread line 201 and the second thread line 202 will move at different speeds or distances, thereby generating a differential effect in the relative movement of the coarse adjustment table 1 and the precision table 101. The differential effect allows fine displacement control to be achieved by adjusting the relative speed of the two sections of the thread without changing the direction of rotation.

[0028] Starting the second motor 4 can drive the coarse adjustment screw 401 to rotate, and the rotating coarse adjustment screw 401 will drive the coarse adjustment workbench 1 to move, and the precision workbench 101 can be driven to move quickly through the differential screw 2, thereby realizing rapid adjustment of the coarse adjustment workbench 1 and the precision workbench 101.

[0029] Embodiment 2, as Figures 2 to 3 As shown, based on the first embodiment, the differential screw can also be used for optical precision focusing, the first thread line 201 is threadedly connected with the lens holder 5, the lens 502 is fixedly mounted on the lens holder 5, the second thread line 202 is threadedly connected with the connecting seat 6, and the stage 602 is fixedly mounted on the connecting seat 6. When the differential screw 2 rotates, it will drive the lens holder 5 and the connecting seat 6 threadedly connected to the differential screw 2 to move, thereby achieving precise relative displacement, thereby achieving precision focusing at a low cost.

[0030] The frame is fixedly mounted with a first guide rod 501 and a second guide rod 601, wherein the first guide rod 501 is slidably connected to the lens holder 5, and the second guide rod 601 is slidably connected to the connecting seat 6. The first guide rod 501 guides the lens holder 5 to prevent the lens holder 5 from rotating with the rotation of the differential screw 2, and similarly, the second guide rod 601 can prevent the connecting seat 6 from rotating with the rotation of the differential screw 2.

[0031] The working principle of this embodiment is that when the differential screw 2 rotates, it will drive the lens mount 5 and the connecting seat 6 threadedly connected to the differential screw 2 to move, thereby achieving precise relative displacement, thereby achieving precise focusing at a low cost.

[0032] The above specific embodiments are only several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A differential precision displacement platform, comprising a frame, characterized in that: Also includes: A coarse adjustment workbench (1) and a precision workbench (101) slidably mounted on the frame; A differential fine adjustment component, wherein the differential fine adjustment component drives the coarse adjustment workbench (1) and the precision workbench (101) to move synchronously at differential speeds in the same direction; A coarse adjustment displacement mechanism drives the coarse adjustment workbench (1) and the precision workbench (101) to move rapidly on the frame.

2. A differential precision displacement platform according to claim 1, characterized in that: The differential fine adjustment assembly comprises a differential screw (2), and two ends of the differential screw (2) are respectively threadedly connected to the coarse adjustment workbench (1) and the precision workbench (101).

3. A differential precision displacement platform according to claim 2, characterized in that: The differential screw (2) is provided with a first thread line (201) and a second thread line (202); the first thread line (201) is threadedly connected to the precision workbench (101); the second thread line (202) is threadedly connected to the coarse adjustment workbench (1); and the pitch of the first thread line (201) is greater than that of the second thread line (202).

4. The differential precision displacement platform according to claim 3, characterized in that: The differential fine adjustment component also includes a floating motor seat (3) slidably mounted on the frame, a first motor (301) being fixedly mounted on the floating motor seat (3), and an output shaft of the first motor (301) being coaxially fixedly connected to the differential screw rod (2).

5. The differential precision displacement platform according to claim 1, characterized in that: The coarse adjustment displacement mechanism comprises a second motor (4) fixedly mounted on a frame, a coarse adjustment lead screw (401) fixedly mounted on an output shaft of the second motor (4), and the coarse adjustment lead screw (401) is threadedly connected to the coarse adjustment workbench (1).

6. The differential precision displacement platform according to claim 3, characterized in that: The first thread line (201) is threadedly connected to a lens seat (5), and a lens (502) is fixedly mounted on the lens seat (5); the second thread line (202) is threadedly connected to a connecting seat (6), and a loading platform (602) is fixedly mounted on the connecting seat (6).

7. The differential precision displacement platform according to claim 6, characterized in that: A first guide rod (501) and a second guide rod (601) are fixedly mounted on the frame; the first guide rod (501) is slidably connected to the lens seat (5); and the second guide rod (601) is slidably connected to the connection seat (6).

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