A high-precision imaging device

Abstract

The present invention discloses a high-precision imager, comprising a machine head, wherein the machine head comprises a fixed plate, a screw rod and a Z-axis slide plate, wherein both ends of the screw rod are fixed on the fixed plate, and the screw rod drives the Z-axis slide plate to move vertically through a flexible connection mechanism. The flexible connection mechanism comprises a fixed block, a steel wire rope and a connecting block, and the connecting block is arranged in a non-contact manner with the Z-axis slide plate. When the screw rod is deformed, the copper wire rope can absorb the deformation to prevent the deformation from being transmitted to the Z-axis slide plate, thereby ensuring that the Z-axis slide plate is closer to vertical and the vertical accuracy of the Z-axis slide plate is ensured. The arrangement of the three sliders ensures that there is always only one connecting surface between the Z-axis slide plate and the fixed plate, which further ensures the vertical accuracy of the Z-axis slide plate.

Description

Technical Field

[0001] The invention relates to the field of image measurement, and in particular to a high-precision imager. Background Art

[0002] Imager, also called image measuring instrument, is based on CCD digital image, relying on computer screen measurement technology and powerful software capabilities of spatial geometry calculation. After installing special control and graphic measurement software, the computer becomes a measurement brain with software soul, which is the main body of the whole equipment. It can quickly read the displacement value of the optical ruler, and get the desired result instantly through software module calculation based on spatial geometry; and generate graphics on the screen for the operator to compare images and shadows, so as to intuitively distinguish possible deviations in the measurement results. Image measuring instrument is a high-precision optical image measuring instrument composed of high-resolution CCD color lens, continuous zoom objective lens, color display, video crosshair display, precision grating ruler, multi-function data processor, data measurement software and high-precision workbench structure.

[0003] When the image measuring instrument is in use, the accuracy of the Z-axis slide is very important. In the prior art, the Z-axis slide is directly driven by the lead screw when it moves up and down, that is, the Z-axis slide is directly connected to the lead screw or the Z-axis slide is connected to the lead screw through a metal block, that is, a rigid connection. However, when the lead screw drives the Z-axis slide, a slight deformation will occur, and then the deformation will be transmitted to the Z-axis slide, affecting the accuracy of the Z-axis slide when it moves up and down. How to reduce the impact of the lead screw deformation on the Z-axis slide is a technical problem that technical personnel in this field urgently need to solve.

[0004] Moreover, in the prior art, a slide rail and a slider are provided between the Z-axis slide plate and the fixed plate, and the number of the sliders is generally four or six, that is, there are four or six fixing points between the Z-axis slide plate and the fixed plate. Since only three points can form a surface, there are multiple connecting surfaces between the Z-axis slide plate and the fixed plate. Due to the internal stress of the metal, the multiple connecting surfaces will inevitably cause unstable accuracy when the Z-axis slide plate moves up and down. Summary of the invention

[0005] The purpose of the present invention is to provide a high-precision imager to solve the technical problems in the background technology.

[0006] To achieve the aforementioned purpose, the present invention provides the following technical solutions:

[0007] A high-precision imager comprises a machine head, wherein the machine head comprises a fixed plate, a screw rod and a Z-axis slide plate, wherein both ends of the screw rod are fixed on the fixed plate, and the screw rod drives the Z-axis slide plate to move vertically through a flexible connection mechanism.

[0008] Furthermore, the flexible connection mechanism includes a fixed block, a steel wire rope and a connecting block, wherein the fixed block fixes both ends of the steel wire rope on the Z-axis slide plate, one end of the connecting block passes through the Z-axis slide plate and is connected to the middle part of the steel wire rope, and the connecting block is non-contact with the Z-axis slide plate, and the other end of the connecting block is connected to the screw rod.

[0009] A sliding range is also provided between the fixed plate and the Z-axis slide plate, and the sliding range includes a sliding rail and a sliding block. There are multiple sliding rails and they are fixed to the fixed plate. The sliding block is arranged on the sliding rails. The Z-axis slide plate and the sliding block are fixedly arranged, and the sliding blocks are arranged in a triangle shape.

[0010] It also comprises a main body, on which a fixing frame for fixing the machine head is arranged, the machine head is arranged on the fixing frame, and a vertically downward lens is arranged on the Z-axis slide.

[0011] The screw rod web comprises a screw rod and a screw rod sleeve, and the other end of the connecting block is fixedly connected to the screw rod sleeve.

[0012] Beneficial effect: the flexible connection mechanism includes a fixed block, a steel wire rope and a connecting block, and the connecting block is arranged in a non-contact manner with the Z-axis slide plate. When the lead screw is deformed, the copper wire rope can absorb the deformation and prevent the deformation from being transmitted to the Z-axis slide plate, thereby ensuring that the Z-axis slide plate is closer to vertical and ensuring the vertical accuracy of the Z-axis slide plate.

[0013] The arrangement of the three sliders ensures that there is always only one connection surface between the Z-axis slide plate and the fixed plate, thus further ensuring the vertical accuracy of the Z-axis slide plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 : A stereogram of a high-precision imager.

[0015] Figure 2 : A stereoscopic image of the nose of a high-precision imager.

[0016] Figure 3 : Figure 3 Enlarged view of point A in the middle.

[0017] Figure 4 : An exploded view of the nose of a high-precision imaging instrument.

[0018] Figure 5 : Schematic diagram of the connection between the screw rod and the Z-axis slide.

[0019] Figure 6 : Figure 5 Enlarged view of point B in the middle.

[0020] Figure 7 : Diagram of slider settings.

[0021] Figure 8 : A head installation position diagram of a high-precision imager.

[0022] Fig. 9 : Illustration of accuracy measurement.

[0023] Fig.10 : Accuracy test data table.

[0024] Fig.11 : Comparison chart of accuracy test results. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] See also Figure 1-4 and Figure 8 A high-precision imager includes a body 1, a fixing frame 2 for fixing a machine head 3 is provided on the body 1, the machine head 3 is arranged on the fixing frame 2, the machine head 3 includes a fixing plate 31, a screw rod 33 and a Z-axis slide 36, the screw rod 33 is driven by a driving motor 32, both ends of the screw rod 33 are fixed on the fixing plate 31, and the screw rod 33 drives the Z-axis slide 36 to move vertically through a flexible connection mechanism 35. A vertically downward lens 37 is provided on the Z-axis slide 36.

[0027] See also Figure 5-6 The flexible connection mechanism 35 includes a fixed block 351, a steel wire 353 and a connecting block 354. The fixed block 351 fixes the two ends of the steel wire 353 on the Z-axis slide 36. The two ends of the steel wire 353 are also provided with adjustment screws 352 for adjusting the tightness of the steel wire 353. One end of the connecting block 354 passes through the Z-axis slide 36 and is connected to the middle of the steel wire 353. The connecting block 354 is non-contactingly arranged with the Z-axis slide 36. The other end of the connecting block 354 is connected to the screw rod width 33. The screw rod width 33 includes a screw rod 331 and a screw rod sleeve 332. The other end of the connecting block 354 is fixedly connected to the screw rod sleeve 332. When the screw rod width 33 is deformed, the steel wire 353 can absorb the deformation to prevent the deformation from being transmitted to the Z-axis slide 36, thereby ensuring that the Z-axis slide 36 is closer to vertical and the vertical accuracy of the Z-axis slide 36 is ensured.

[0028] See also Figure 7A sliding width 34 is further provided between the fixed plate 31 and the Z-axis slide plate 36. The sliding width 34 includes a slide rail 342 and a slider 341. The slide rail 342 has multiple sections and is fixed on the fixed plate 31. The slider 341 is arranged on the slide rail 342. The Z-axis slide plate 36 and the slider 341 are fixedly arranged. A cushion block 38 can be further provided between the Z-axis slide plate 36 and the slider 341. The sliders 341 are arranged in a triangle shape. Two or three slide rails 342 can be provided on the fixed plate 31. When two slide rails 342 are provided, one of the slide rails 342 can be provided. Two sliders 341 are arranged on the slide rail 42 and one slider 341 is arranged on the other slide rail 342; when three slide rails 342 are arranged, one slider 341 is respectively arranged on each slide rail 342. In short, only three sliders 341 are arranged on the slide rail 342, and the three sliders 341 are arranged in a triangle shape. According to the principle that three points form a surface, the three sliders 341 can ensure that the Z-axis slide plate 36 always moves vertically on a surface. The setting of the three sliders 341 ensures that there is always only one connecting surface between the Z-axis slide plate 36 and the fixed plate 31, which further ensures the vertical accuracy of the Z-axis slide plate 36.

[0029] See also Figure 9-11 , the accuracy effect of the embodiment is tested and described:

[0030] During the test, there were four people testing the schemes, namely Scheme 1, Scheme 2, Scheme 3, and Scheme 4;

[0031]

[0032] Table 1

[0033] From Table 1 we can see that:

[0034] Solution 1: Test the vertical accuracy of the Z-axis slide 36 of the prior art.

[0035] Solution 2: Only the connection method between the Z-axis slide plate 36 and the fixed plate 31 is improved, that is, there are three slide blocks 341.

[0036] Solution 3: Only the connection mode between the Z-axis slide plate 36 and the screw rod 33 is improved, that is, a flexible connection.

[0037] Solution 4: Improvements have been made to the connection method between the Z-axis slide plate 36 and the fixed plate 31 and the connection method between the Z-axis slide plate 36 and the lead screw width 33.

[0038] See also Fig. 9The test method is: use a micrometer with an accuracy of 0.0001mm fixed on the fixed plate 31, measure the accuracy of one side of the Z-axis slide 36, first raise the Z-axis slide 36 to the highest point as the 0 point, and "set the micrometer to zero", move the Z-axis slide 36 down to the positions of 20mm, 40mm, 60mm, 80mm and 100mm in turn, and record the data of a total of six positions in the stroke from 0mm to 100mm, from plan one to plan four, and test each plan once.

[0039] from Figure 10-11 It can be seen that the accuracy error of Solution 1 is 0.0035mm, while the normal value standard is 0.002mm, which has exceeded the normal value.

[0040] The precision error of Solution 2 is 0.002mm, which does not exceed the normal value, but is at the limit value.

[0041] The accuracy error of Scheme 3 is 0.001mm, which is within the normal value.

[0042] Solution three has an accuracy error of 0.0002mm and has the best effect.

[0043] It will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0044] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-precision imager, comprising a head, wherein the head comprises a fixed plate, a screw rod and a Z-axis slide, characterized in that: The two ends of the screw rod are fixed on the fixed plate, and the screw rod drives the Z-axis slide to move vertically through a flexible connection mechanism. The flexible connection mechanism comprises a fixed block, a steel wire rope and a connecting block. The fixed block fixes both ends of the steel wire rope on the Z-axis slide. One end of the connecting block passes through the Z-axis slide and is connected to the middle of the steel wire rope, and the connecting block is non-contacting with the Z-axis slide. The other end of the connecting block is connected to the lead screw. A sliding range is also provided between the fixed plate and the Z-axis slide plate, and the sliding range includes a slide rail and a slider. The slide rails have multiple sections and are fixed to the fixed plate. The slider is arranged on the slide rails. The Z-axis slide plate and the slider are fixedly arranged, and the sliders are arranged in a triangle shape. It also includes a body, on which a fixing frame for fixing the machine head is provided, the machine head is arranged on the fixing frame, and a vertical downward lens is provided on the Z-axis slide. The screw rod web comprises a screw rod and a screw rod sleeve, and the other end of the connecting block is fixedly connected to the screw rod sleeve.

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