Vertical large-size digital display scale calibration device based on grating

Abstract

The utility model discloses a vertical large-size digital display scale calibration device based on a grating. Three adjustable ground feet are arranged at the bottom of the base, a first stand column and a lifting mechanism are arranged on the upper portion of the base, the first stand column is vertically fixed to the upper portion of the base, an upper fastening plate is connected to the upper portion of the first stand column, and a horizontally-arranged first straight steel ruler is fixed to the position, close to the lower portion of the upper fastening plate, of the first stand column; the lower portion of the first stand column is detachably connected with a lower fastening plate, a horizontally-arranged second straight steel ruler is fixed to the position, close to the upper portion of the lower fastening plate, of the first stand column, a vertically-arranged grating ruler is fixed to the first stand column, the end of the first straight steel ruler and the end of the second straight steel ruler are tightly attached to the grating ruler, and the lifting mechanism is connected with the moving table. A reading head of the grating ruler is fixed on the moving table and corresponds to the grating ruler, a connecting piece used for being connected with a display panel of the digital display scale is arranged on the moving table, and fasteners used for being connected with the digital display scale are arranged on the upper fastening plate and the lower fastening plate.

Description

Technical Field

[0001] The utility model relates to a digital display ruler calibration device, in particular to a calibration device used for calibrating a large-size digital display ruler. Background Art

[0002] A digital ruler is a length calibration (indicating) tool that uses measurement and digital display technology to read the relative distance moved by a moving frame on a ruler rod. The measuring range is from 100mm to 2000mm.

[0003] According to the calibration method of JJF1280-2011 "Capacitive Barrier Digital Display Scale Calibration Specification", the indication error of the capacitive bar digital display scale is as follows: Figure 1 The measurement is carried out using the special measuring device shown. The indication error of the non-enclosed capacitive grid digital display scale with a measurement upper limit not exceeding 1000mm can also be measured using a gauge block.

[0004] However, there are some problems whether using gauge blocks or special measuring devices to calibrate the capacitive digital scale. The main problems are: Calibration with gauge blocks: (1) For digital scales with a measuring range of (400-1000) mm, the deformation of the digital scale itself will affect the calibration accuracy; (2) The calibration accuracy will also be reduced during the splicing of gauge blocks. Calibration with special measuring devices: (1) For example, Figure 1 As shown in the figure, the digital scale is placed horizontally. The digital scale with a measuring range of more than 600mm still has deformation caused by the length of the scale body. Especially for the digital scales of 1000mm, 1200mm, 1500mm and 2000mm, the deformation will be relatively large, reaching the millimeter level. (2) As for the Abbe error caused by the non-parallelism between the scale body and the measuring axis, the specification only qualitatively describes "adjusting the axis of the digital scale of the capacitive grid to be parallel to the moving direction of the carriage and as close as possible to the measuring axis of the standard", and does not set up a special structure to quantitatively reduce the Abbe error, which will have a greater impact on the calibration accuracy of large-sized digital scales. Utility Model Content

[0005] In view of the above-mentioned defects in the prior art, the utility model provides a grating-based vertical large-size digital scale calibration device which can improve calibration accuracy and is suitable for calibrating large-size digital scales.

[0006] The utility model is realized by the following technical solution: a vertical large-size digital scale calibration device based on grating, characterized in that: it includes a base made of marble, the bottom of the base is provided with three adjustable feet, the upper part of the base is provided with a first column and a lifting mechanism, the first column is made of marble, the first column is vertically fixed to the upper part of the base and is perpendicular to the plane of the base, the upper part of the first column is connected to the upper fastening plate, a horizontally arranged first steel ruler is fixed on the first column near the lower position of the upper fastening plate, and the lower part of the first column is detachably connected to the lower fastening plate. A second steel ruler is fixed horizontally on the first column near the upper position of the lower fastening plate, and a grating ruler is fixed vertically on the first column. The ends of the first steel ruler and the second steel ruler are close to the grating ruler. The lifting mechanism is arranged at the front or side of the first column, and the lifting mechanism is connected to a movable platform that can be lifted and lowered accordingly. The reading head of the grating ruler is fixedly arranged on the movable platform and corresponds to the grating ruler. The movable platform is also provided with a connector for connecting to the display panel of the digital display ruler. Fasteners for connecting the digital display ruler are provided on both the upper fastening plate and the lower fastening plate.

[0007] When using the utility model to calibrate the digital ruler, the digital ruler is placed vertically so that the digital ruler is in a naturally drooping state, which can minimize the deformation of the ruler body. The horizontality of the base can be adjusted by the feet at the bottom of the base. The upper and lower ends of the digital ruler are fixed to the upper fastening plate and the lower fastening plate respectively by fasteners. The first steel ruler and the second steel ruler are used to ensure that the upper and lower ends of the digital ruler are at the same distance from the grating ruler. In order to ensure that the upper and lower ends of the digital ruler are in the same plumb plane, the distance between the upper and lower ends of the digital ruler and the first column can be determined by an auxiliary tool, a digital depth caliper. The basic principle of calibration of the utility model is to provide a standard value for measuring length based on the grating ruler. During calibration, the movable platform is connected to the display panel of the digital ruler through a connector. The movable platform moves under the drive of the lifting mechanism, and at the same time drives the display panel of the digital ruler to move. During the movement of the movable stage, the reading head of the grating ruler set on the movable stage is used to take the reading as the standard value of the measured length. The display panel of the digital scale also displays the measured value of the digital scale. The difference between the measured value of the digital scale and the measured value of the grating ruler is the indication error of the digital scale.

[0008] Furthermore, the lifting mechanism includes a second column vertically fixed to the upper portion of the base, the second column being disposed on the side of the first column, and the second column being provided with a guide rail and a lead screw arranged along its height direction. The movable platform is slidably disposed on the guide rail on the second column, and the movable platform is connected to a nut screwed to the lead screw; the lead screw is connected to a drive mechanism. The drive mechanism drives the lead screw to rotate, thereby driving the movable platform to move along the guide rail.

[0009] Furthermore, threaded holes are provided on the lower portion of the first column for mounting the lower fastening plate corresponding to the 1000mm, 1200mm, and 1500mm digital scales, respectively. Depending on the specifications of the digital scale to be calibrated, the lower fastening plate can be installed at different heights on the first column, thereby meeting the requirements for calibrating digital scales of different specifications.

[0010] Furthermore, in order to facilitate the quick connection between the connector and the display panel of the digital scale, a clip for clamping the display panel of the digital scale is connected to the head of the connector. The connector and the display panel of the digital scale can be conveniently connected together by the clip.

[0011] Furthermore, in order to facilitate the adjustment of the position of the digital scale, a cross-shaped screw mounting groove is provided on the lower fastening plate, and a fastening screw is fixed in the screw mounting groove by a nut.

[0012] The beneficial effects of the present invention are as follows: The present invention has a rational structural design, and the digital scale is placed vertically, so that the scale body is naturally suspended, which can minimize scale body deformation and improve calibration accuracy. A grating scale is used as the reference axis, and a steel ruler is used to ensure that the upper and lower ends of the digital scale are at the same distance from the grating scale. By adjusting the distance between the upper and lower ends of the digital scale and the first column, the digital scale can be kept parallel to the measurement axis as much as possible, reducing Abbe error and improving the calibration accuracy of the digital scale. The present invention is particularly suitable for calibrating large-scale digital scales of 1000 mm, 1200 mm, 1500 mm, and 2000 mm, and can greatly improve the calibration accuracy of large-scale digital scales. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a special measuring device used in the calibration of digital display scales in the existing technology;

[0014] Figure 2 It is a structural diagram of the utility model;

[0015] Figure 3 It is a top view schematic diagram of the utility model;

[0016] Figure 4 This is a front view of the lower fastening plate in the utility model;

[0017] Figure 5 It is a side view of the lower fastening plate of the utility model;

[0018] Figure 6 This is a front view of the upper fastening plate in the utility model;

[0019] Figure 7 It is a side view of the upper fastening plate of the utility model;

[0020] Figure 8 It is a structural diagram of the second column in the utility model;

[0021] Figure 9 It is a structural diagram of a digital display scale;

[0022] In the figure, 1 ， , triangular cone, 2 ， , interferometer, 3 ， , laser interferometer, 4 ， , main scale, 5 ， , game frame, 6 ， , connecting plate, 7 ， , drag plate, 8 ， , guide rail, 9 ， , base, 10 ， , support;

[0023] 1. Base, 2. Lower fastening plate, 3. Second steel ruler, 4. First column, 5. Display panel of digital scale, 6. Digital scale, 7. First steel ruler, 8. Upper fastening plate, 9. Grating scale, 10. Moving table, 11. Connector, 12. Second column, 13. Foot, 14. Motor, 15. Driving pulley, 16. Driven pulley, 17. Grating scale reading head, 18. Guide rail, 19. Lead screw, 20. Threaded hole for fixing the lower fastening plate at 1000mm, 21. Threaded hole for fixing the lower fastening plate at 1200mm, 22. Threaded hole for fixing the lower fastening plate at 1500mm, 23. Control cabinet;

[0024] 2.1. Screw mounting slot, 2.2. First fastening screw, 2.3. First nut, 2.4. Second nut;

[0025] 6.1. Upper fixing bracket of digital scale; 6.2. Lower fixing bracket of digital scale;

[0026] 8.1, second fastening screw, 8.2, third nut. DETAILED DESCRIPTION

[0027] The present invention will be further described below by way of non-limiting embodiments and in conjunction with the accompanying drawings:

[0028] As attached Figure 2-Figure 9As shown, a vertical large-scale digital scale calibration device based on grating includes a base 1 made of marble, and three adjustable feet 13 are provided at the bottom of the base 1. The base 1 can be adjusted to a horizontal level by adjusting the feet 13. A first column 4 and a lifting mechanism are provided on the upper part of the base 1. The first column 4 is made of marble, and is vertically fixed to the upper part of the base 1 and is perpendicular to the plane of the base. The upper part of the first column 4 is connected to an upper fastening plate 8, and the upper fastening plate 8 is fixed to the first column 4 by screws. A second fastening screw 8.1 is fixed on the upper fastening plate 8, and a nut 8.2 is provided on the second fastening screw 8.1. The second fastening screw 8.1 and the nut 8.2 are used to fix the upper fixing frame 6.1 of the digital scale. A horizontally arranged first steel ruler 7 is fixed on the first column 4 near the lower position of the upper fastening plate 8. A lower fastening plate 2 is detachably connected to the lower portion of the first column 4. This lower fastening plate 2 is secured to the first column 4 via four screws. A first fastening screw 2.2 is provided on the lower fastening plate 2. To facilitate adjustment, in this embodiment, a cross-shaped screw mounting slot 2.1 is preferably provided on the lower fastening plate 2. The first fastening screw 2.2 is a stepped screw, and its cap is movably positioned within the screw mounting slot 2.1, allowing the position of the first fastening screw 2.2 to be adjusted as needed. The first fastening screw 2.2 is secured by a first nut 2.3. Two second nuts 2.4 are also provided on the first fastening screw 2.2. These two second nuts 2.4 secure the lower mounting bracket 6.2 of the digital scale, and the position of the lower mounting bracket 6.2 can be adjusted using these two nuts 2.4. A second steel ruler 3 is horizontally secured to the first column 4, near the upper portion of the lower fastening plate 2. A vertical grating scale 9 is secured to the first column 4. The ends of the first steel ruler 7 and the second steel ruler 3 are both in close contact with the grating ruler 9. The lifting mechanism is arranged at the front or side of the first column 4, and the lifting mechanism is connected to the movable platform 10 that can be lifted and lowered accordingly. The reading head 17 of the grating ruler is fixedly arranged on the movable platform 10 and corresponds to the grating ruler 9. The grating ruler 9 and the reading head 17 are matching components, both of which are existing technologies and can be purchased. A connector 11 for connecting to the display panel 5 of the digital scale is also provided on the movable platform 10. In order to facilitate quick connection with the display panel 5 of the digital scale, it is preferred that the head of the connector 11 is connected to a clip for clamping the display panel 5 of the digital scale. The clip can be used to conveniently clamp the display panel 5 of the digital scale, and quickly realize connection with the display panel 5 of the digital scale. The clip is existing technology, and various clips that can clamp the display panel 5 of the digital scale in the existing technology can be used, such as spring clips.

[0029] The lifting mechanism of the present invention is used to move the mobile platform 10 up and down. The lifting mechanism can adopt various lifting structures in the prior art. To ensure reliable linear movement of the mobile platform and facilitate operation, the lifting mechanism preferably adopts the following structure: the lifting mechanism includes a second column 12 vertically fixed to the upper portion of the base 1. The second column 12 is arranged on the side of the first column 4. The second column 12 is fixed with a guide rail 18 and a lead screw 19 arranged along its height direction. The mobile platform 10 is slidably mounted on the guide rail 18 on the second column 12, and the mobile platform 10 is connected to a nut screwed to the lead screw 19. The lead screw 19 is driven to rotate by the motor 14 through the driving pulley 15, the synchronous belt, and the driven pulley 16. The motor 14 is mounted on the motor mounting plate at the upper end of the second column 12.

[0030] To facilitate calibration of digital scales of different specifications, in this embodiment, threaded holes corresponding to the mounting positions of the lower fastening plates for 1000mm, 1200mm, and 1500mm digital scales are provided on the lower portion of the first upright 4, namely, threaded holes 20 for the lower fastening plate at 1000mm, threaded holes 21 for the lower fastening plate at 1200mm, and threaded holes 22 for the lower fastening plate at 1500mm. Depending on the specifications of the digital scale to be calibrated, the lower fastening plate 2 can be moved to the corresponding mounting position for fixation.

[0031] The workflow of this utility model:

[0032] 1. First, place the calibration device on a fixed, flat, hard cement floor and adjust the three feet 13 of the base 1 to make it level.

[0033] 2. Fix the lower fastening plate 2 to the corresponding position on the first column 4 according to the measuring range of the digital scale 6 to be calibrated;

[0034] 3. Fix the upper fixing bracket 6.1 on the top of the digital scale 6 to the fastening screws of the upper fastening plate 8 and tighten the fastening screws;

[0035] 4. When the digital scale 6 is in a naturally suspended state, insert the lower fixing bracket 6.2 at the bottom into the fastening screws of the lower fastening plate 2, but do not tighten the nuts yet;

[0036] 5. Read the scale of the digital scale 6 at the upper fastening plate corresponding to the first steel ruler, and use a digital depth caliper to measure the distance between the ruler body at that location and the marble surface of the first rear column;

[0037] 6. Adjust the bottom of the digital scale to the same position according to the first steel ruler scale corresponding to the top of the digital scale 6 and the distance from the marble surface of the first column at the rear. Tighten the fastening screws of the lower fastening plate to fix the position of the bottom of the digital scale.

[0038] 7. Connect the movable platform 10 and the display panel 5 of the digital scale through the connector 11, start the device at the same time, and raise the movable platform 10 to the top;

[0039] 8. Set both the grating ruler reading and the digital scale reading to 0 at the same time. Select the calibration point according to the measurement range of the digital scale, start the moving stage, and the digital scale reading minus the grating ruler reading is the digital scale indication error.

[0040] The other parts of this embodiment are all existing technologies and will not be described in detail here.

Claims

1. A grating-based vertical large-scale digital scale calibration device, characterized by: The invention relates to a base (1) made of marble, wherein the bottom of the base (1) is provided with three adjustable feet (13), and the upper part of the base (1) is provided with a first column (4) and a lifting mechanism, wherein the first column (4) is made of marble, and the first column (4) is vertically fixed to the upper part of the base (1) and is perpendicular to the plane of the base, and the upper part of the first column (4) is connected with an upper fastening plate (8), and a horizontally arranged first steel ruler (7) is fixed on the lower part of the first column (4) near the lower part of the upper fastening plate (8), and the lower part of the first column (4) is detachably connected with a lower fastening plate (2), and a horizontally arranged first steel ruler (7) is fixed on the upper part of the first column (4) near the upper part of the lower fastening plate (2). A second steel ruler (3) is provided, a grating ruler (9) is fixed vertically on the first column (4), the ends of the first steel ruler (7) and the second steel ruler (3) are both in close contact with the grating ruler (9), the lifting mechanism is provided on the front or side of the first column (4), the lifting mechanism is connected to a movable platform (10) that can be lifted and lowered accordingly, a reading head (17) of the grating ruler is fixedly provided on the movable platform (10) and corresponds to the grating ruler (9), the movable platform (10) is also provided with a connecting piece (11) for connecting to a display panel (5) of a digital display ruler, and fasteners for connecting to the digital display ruler are provided on both the upper fastening plate (8) and the lower fastening plate (2).

2. The grating-based vertical large-scale digital scale calibration device according to claim 1 is characterized in that: The lifting mechanism comprises a second column (12) vertically fixed to the upper part of the base (1); the second column (12) is arranged on the side of the first column (4); the second column (12) is provided with a guide rail and a lead screw arranged along its height direction; the movable platform (10) is slidably arranged on the guide rail on the second column (12), and the movable platform (10) is connected to a nut screwed on the lead screw; the lead screw is connected to the driving mechanism.

3. The grating-based vertical large-scale digital scale calibration device according to claim 1 is characterized in that: The lower part of the first column (4) is provided with threaded holes corresponding to the installation positions of the lower fastening plates of the 1000mm, 1200mm and 1500mm digital scales respectively.

4. The grating-based vertical large-scale digital scale calibration device according to claim 1, 2 or 3, characterized in that: The head of the connecting member (11) is connected to a clamp for clamping the display panel (5) of the digital display scale.

5. The grating-based vertical large-scale digital scale calibration device according to claim 1, 2 or 3, characterized in that: A cross-shaped screw installation groove (2.1) is provided on the lower fastening plate (2), and a fastening screw is fixed in the screw installation groove (2.1) via a nut.

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