Measuring device with functions of line measurement and straightness measurement

Abstract

The utility model relates to a measuring device with functions of line measurement and straightness measurement. The measuring device comprises a marble platform, a laser interferometer, a CCD (Charge Coupled Device) camera, a lens, a sliding bracket, a micrometer and a measured piece support, the laser interferometer comprises a laser head, an interference mirror and a reflecting mirror; the sliding support comprises an L-shaped air floating sliding block, a stand column and a cross arm. One end face of the L-shaped air floating sliding block is attached to one side face of the marble platform, the other end face of the L-shaped air floating sliding block is located on the upper surface of the marble platform, the stand column is fixedly arranged on the L-shaped air floating sliding block and connected with one end of the cross arm through a height adjustable device, and the reflector, the CCD camera and the micrometer are fixedly installed at the other end of the cross arm. The sliding support slides back and forth along the end face of the marble platform. And the measured piece support is supported on a Bezier point of the measured piece. The device has the functions of line measurement and straightness measurement, the space use cost is reduced, and the instrument utilization rate is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of measurement and testing, and specifically refers to a measuring device with both line grain measurement and straightness measurement functions. Background Art

[0002] Linear rulers are common measuring instruments, such as standard steel tape measures and third-class metal linear rulers, which are often used as metrological standards. Linear rulers are widely used in the field of measurement as geometric measuring tools. The accuracy of linear ruler parameters directly affects the accuracy of product measurement. For the measurement of linear ruler parameters, it is necessary to measure the linear ruler scale range, scale width and other parameters in accordance with the National Metrology Verification Regulations of the People's Republic of China. Linear rulers have high metrological performance requirements and a long ruler body. Commonly used universal tool microscopes, imagers and other equipment cannot meet their measurement requirements. For this type of measuring instrument, a laser interferometer is usually used in conjunction with a calibration table, and a reading microscope or CCD camera is used as the linear aiming device to move along the guide rail to complete the measurement. The entire set of measuring equipment occupies a large space.

[0003] Straightness is one of the important indicators for evaluating the straightness of an object. The measurement of straightness can be used to determine the flatness and straightness of an object. The smaller the straightness, the flatter the surface of the object. Straightness is a commonly used measurement parameter in the precision machinery industry. A straightness measuring instrument composed of precision guide rails, sliders, micrometers, etc. can be used. When the slider moves, the micrometer contacts the surface of the test piece and measures the straightness error of the surface of the test piece. However, when the test piece that needs to measure the straightness is such as a flat ruler, its common length dimension is generally longer, so a longer precision guide rail is also required to complete the measurement.

[0004] In the prior art, to complete the above-mentioned line measurement and straightness measurement, two different sets of measuring instruments need to be prepared for separate measurements. The measuring instruments occupy a large space and have limited instrument utilization, and the instrument manufacturing cost and measurement cost are high. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a measuring device with both line grain measurement and straightness measurement functions, which can complete line grain measurement and straightness measurement, and reduce the space occupied by the instrument when meeting the above two measurement requirements, improve the instrument utilization rate, and reduce the instrument manufacturing cost, space utilization cost and instrument maintenance cost.

[0006] The utility model is achieved in this way:

[0007] The measuring device with both line measurement and straightness measurement functions includes: a marble platform, a laser interferometer, a CCD camera, a lens, a sliding bracket, a micrometer and a support for the measured object;

[0008] The laser interferometer comprises: a laser head, an interferometer and a reflector;

[0009] The sliding bracket comprises: an L-shaped air-floating slider, a column and a cross arm; one end surface of the L-shaped air-floating slider is attached to a side surface of the marble platform, and the other end surface is located on the upper surface of the marble platform, on which the column is fixedly arranged, and the column is connected to one end of the cross arm through a height-adjustable device, and the other end of the cross arm is fixedly installed with the reflector, the CCD camera and the micrometer; the sliding bracket slides back and forth along the end surface of the marble platform;

[0010] The marble platform is a rectangular parallelepiped, and is provided with a groove parallel to the sliding direction of the sliding bracket, and the end of the L-shaped air floating sliding block located at one end of the upper surface of the marble platform is inserted downward into the groove;

[0011] The laser head, the interference mirror and the reflector are at the same height and the three points are in a collinear state. The interference mirror is located between the laser head and the reflector, and the collinear direction is parallel to the sliding direction of the sliding bracket.

[0012] The lens is mounted below the CCD camera;

[0013] When line measurement is required, the test piece support is placed on the marble platform directly below the lens; when straightness measurement is required, the test piece support is placed on the marble platform directly below the micrometer; the test piece support is supported on the Bessel point of the test piece.

[0014] Furthermore, a support column is provided on a side edge of the marble platform which is perpendicular to the sliding direction of the sliding bracket, and the interferometer is placed on the support column.

[0015] Furthermore, the height adjustable device comprises: a screw rod, a nut and a sliding sleeve;

[0016] The middle part of the column is hollow, one side is open, and a threaded hole is provided on the top; the sliding sleeve is sleeved on the periphery of the column;

[0017] The screw rod is passed through the threaded hole and is arranged in the middle of the column. The nut is sleeved in the middle of the screw rod and is fixedly connected with the sliding sleeve at the side end of the column.

[0018] The sliding sleeve is provided with a slot fixedly connected to the cross arm;

[0019] A screw is arranged on the top of the screw rod, and the height of the cross arm can be adjusted by the screw.

[0020] Furthermore, the cross arm is made of marble.

[0021] Furthermore, a first fixing frame is locked on the cross arm, and the top of the first fixing frame is fixedly connected to a horizontal platform, and the reflecting mirror is arranged on the horizontal platform;

[0022] The side of the horizontal platform is fixedly connected to a camera bracket through a position adjustment device, and the camera bracket is fixedly connected to the CCD camera.

[0023] Furthermore, a second fixing frame is locked on the cross arm, and the second fixing frame is fixedly connected to the micrometer.

[0024] The advantages of the utility model are: it has both line measurement and straightness measurement functions. In terms of design, the two measurement systems have a common structure, which can reduce the manufacturing cost of the instrument. In addition, the above two types of measurements only take up the space of one set of instruments, which reduces the space usage cost and improves the instrument utilization rate. And maintenance only needs to be performed on one set of instruments, so the instrument maintenance cost is relatively lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.

[0026] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0027] Figure 2 yes Figure 1 Schematic diagram of the local (Part A) explosion structure.

[0028] Figure 3 This is the front view of the utility model (excluding the laser head and the interferometer).

[0029] Figure 4 It is a left view of the utility model (excluding the laser head and the interferometer).

[0030] Figure 5 It is a schematic diagram of the use state of the line measurement of the utility model.

[0031] Figure 6 It is a schematic diagram of the use state of the straightness measurement of the utility model.

[0032] Reference numerals:

[0033] 1- marble platform, 2- laser head, 3- interferometer, 4- reflector, 5- CCD camera, 51- lens, 6- sliding bracket, 61- L-shaped air-floating slider, 62- column, 63- cross arm, 7- micrometer, 8- support for measured object, 9- support column, 10- lead screw, 11- groove, 12- sliding sleeve, 13- slot, 14- screw, 15- first fixed frame, 16- horizontal stand, 17- manual fine-tuning device, 18- camera bracket, 19- second fixed frame, 100- line ruler, 200- straight ruler. DETAILED DESCRIPTION

[0034] like Figures 1 to 6 As shown, the measuring device with both line grain measurement and straightness measurement functions includes: a marble platform 1, a laser interferometer, a CCD camera 5, a lens 51, a sliding bracket 6, a micrometer 7 and a test piece support 8;

[0035] Laser interferometer, including: laser head 2, interferometer 3, reflector 4;

[0036] The sliding bracket 6 comprises: an L-shaped air-floating slider 61, a column 62 and a cross arm 63; one end surface of the L-shaped air-floating slider 61 is attached to one side surface of the marble platform 1, and the other end surface is located on the upper surface of the marble platform 1, on which the column 62 is fixedly arranged, and the column 62 is connected to one end of the cross arm 63 through a height-adjustable device, and the other end of the cross arm 63 is fixedly installed with a reflector 4, a CCD camera 5 and a micrometer 7; the sliding bracket 6 slides back and forth along the end surface of the marble platform 1;

[0037] The marble platform 1 is a rectangular parallelepiped, on which a groove 11 is provided which is parallel to the sliding direction of the sliding bracket 6. The end of the L-shaped air-floating slider 61 located at one end of the upper surface of the marble platform 1 is inserted downward into the groove 11 and can slide; the marble platform 1 is used as a test platform and a sliding track. The large platform is very practical in measurement work. In addition to the line and straightness measurement area, other areas can also be used as calibration platforms for other projects;

[0038] The laser head 2 , the interferometer 3 and the reflector 4 are at the same height and in a collinear state. The interferometer 3 is located between the laser head 2 and the reflector 4 , and the collinear direction is parallel to the sliding direction of the sliding bracket 6 .

[0039] A support column 9 is provided on one side edge of the marble platform 1 which is perpendicular to the sliding direction of the sliding bracket 6 , and the interference mirror 3 is placed on the support column 9 .

[0040] The lens 51 is mounted below the CCD camera 5 .

[0041] The height-adjustable device includes: a screw rod 10, a nut (not shown) and a sliding sleeve 12;

[0042] The middle of the column 62 is hollow, one side is open, and a threaded hole is provided on the top; a sliding sleeve 12 is sleeved on the periphery of the column 62;

[0043] The screw rod 10 is passed through the middle of the column 62 through a threaded hole, and the nut is sleeved on the middle of the screw rod 10 and fixedly connected with the sliding sleeve 12 at the side end of the column 62;

[0044] The sliding sleeve 12 is provided with a slot 13 fixedly connected to the cross arm 63;

[0045] A screw 14 is provided at the top of the screw rod 10, and the height of the cross arm 63 can be adjusted by the screw 14. In order to increase the strength, the cross arm 63 is made of marble.

[0046] The cross arm 63 is locked to a first fixed frame 15, the top of the first fixed frame 15 is fixedly connected to a horizontal platform 16, and the reflector 4 is arranged on the horizontal platform 16;

[0047] The side of the horizontal stand 63 is fixedly connected to a camera bracket 18 through a manual fine adjustment device 17, and the camera bracket 17 is fixedly connected to the CCD camera 5; the CCD camera 5 and the reflector 4 are in a straight line parallel to the track direction when moving with the L-shaped air-floating slider 61. A second fixing bracket 19 is also locked on the cross arm 63, and the second fixing bracket 19 is fixedly connected to the micrometer 7.

[0048] like Figure 4 As shown, when line measurement is required, the test piece support 8 is placed on the marble platform 1 directly below the lens 51 of the CCD camera 5 and supported on the Bessel point of the line scale 100 of the test piece;

[0049] During measurement, the L-shaped air-floating slider 61 is connected to the air compressor. Under the action of the air compressor, the entire sliding bracket 6 moves from the front end to the rear end of the test piece. The lens 51 of the CCD camera 5 is first aimed at the zero line of the line scale 100. After the laser interferometer (including the laser head 2, the interferometer 3, and the reflector 4) is cleared, the lines to be measured are aimed and positioned respectively. The laser interferometer measures the length from the zero line to each measured line to complete all measurements. The CCD camera 5 and the laser interferometer are both connected to the computer, and the image and interferometer data are displayed on the computer.

[0050] like Figure 5As shown, when straightness measurement is required, the support 8 of the test piece is placed on the marble platform 1 directly below the micrometer 7, supported on the Bessel point that fixes the flat ruler 200 of the test piece, and the probe of the micrometer 7 is adjusted to contact the measuring surface of the flat ruler 200 of the test piece, so that the measuring direction of the probe is perpendicular to the measuring surface of the flat ruler 200 of the test piece, and the measuring surface of the test piece is adjusted to be parallel to the sliding direction of the sliding bracket 6, that is, the indication of the micrometer 7 when in contact with the front and rear ends of the measuring surface of the test piece is roughly the same, and then the measurement can be started according to the specification requirements. During measurement, the L-shaped air floating slider 61 is connected to the air compressor. Under the action of the air compressor, the entire sliding bracket 6 moves from the front end to the rear end of the test piece, and the full stroke is measured at equal intervals of not less than 10 points, and the reading values ​​of the micrometer 7 are read in sequence, and the straightness error of the measuring surface of the test piece is calculated according to the minimum area method.

[0051] The utility model can complete line measurement and straightness measurement. In terms of design, the two measurement systems have a common structure, which can reduce the manufacturing cost of the instrument. In addition, the above two types of measurements only take up the space of one set of instruments, which reduces the space usage cost and improves the instrument utilization rate. And maintenance only needs to be performed on one set of instruments, so the instrument maintenance cost is relatively lower.

[0052] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present utility model.

Claims

1. A measuring device with both line measurement and straightness measurement functions, characterized in that: include: Marble platform, laser interferometer, CCD camera, lens, sliding bracket, micrometer and support for the tested object; The laser interferometer comprises: a laser head, an interferometer and a reflector; The sliding bracket comprises: an L-shaped air-floating slider, a column and a cross arm; one end surface of the L-shaped air-floating slider is attached to a side surface of the marble platform, and the other end surface is located on the upper surface of the marble platform, on which the column is fixedly arranged, and the column is connected to one end of the cross arm through a height-adjustable device, and the other end of the cross arm is fixedly installed with the reflector, the CCD camera and the micrometer; the sliding bracket slides back and forth along the end surface of the marble platform; The marble platform is a rectangular parallelepiped, and is provided with a groove parallel to the sliding direction of the sliding bracket, and the end of the L-shaped air floating sliding block located at one end of the upper surface of the marble platform is inserted downward into the groove; The laser head, the interference mirror and the reflector are at the same height and the three points are in a collinear state. The interference mirror is located between the laser head and the reflector, and the collinear direction is parallel to the sliding direction of the sliding bracket. The lens is mounted below the CCD camera; The cross arm is made of marble; The cross arm is locked to a first fixed frame, the top of the first fixed frame is fixedly connected to a horizontal platform, and the reflector is arranged on the horizontal platform; The side of the horizontal platform is fixedly connected to a camera bracket through a position adjustment device, and the camera bracket is fixedly connected to the CCD camera; A second fixing frame is also locked on the cross arm, and the second fixing frame is fixedly connected to the micrometer; When line measurement is required, the test piece support is placed on the marble platform directly below the lens; when straightness measurement is required, the test piece support is placed on the marble platform directly below the micrometer; the test piece support is supported on the Bessel point of the test piece.

2. The measuring device with both line measurement and straightness measurement functions as claimed in claim 1, characterized in that: A support column is arranged on the edge of one side of the marble platform which is perpendicular to the sliding direction of the sliding bracket, and the interferometer is placed on the support column.

3. The measuring device with both line measurement and straightness measurement functions as claimed in claim 1, characterized in that: The height-adjustable device comprises: a screw rod, a nut and a sliding sleeve; The middle part of the column is hollow, one side is open, and a threaded hole is provided on the top; the sliding sleeve is sleeved on the periphery of the column; The screw rod is passed through the threaded hole and is arranged in the middle of the column. The nut is sleeved in the middle of the screw rod and is fixedly connected with the sliding sleeve at the side end of the column. The sliding sleeve is provided with a slot fixedly connected to the cross arm; A screw is arranged on the top of the screw rod, and the height of the cross arm can be adjusted by the screw.

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