High-precision small-angle measuring device

Abstract

The invention discloses a high-precision small-angle measuring device which comprises a flat plate, a bearing, a left supporting mechanism, a right supporting mechanism, a motor driving device, a working plane, a height measuring device and a digital display meter. The center of the working plane is supported by the bearing, and the left side and the right side of the working plane are supported by the left supporting mechanism and the right supporting mechanism respectively; the crossbeam of the working plane can rotate around a bearing, the motor driving device comprises a motor and a speed reducer, and the left supporting mechanism drives a push rod to move upwards or downwards in the vertical direction through release or compression of a spring; the right supporting mechanism drives a speed reducer to rotate through a motor, so that a precise screw rod rotates in the vertical direction, a spline shaft is driven to move up and down, and the height of the right side of the working plane is changed; the height measuring device measures the height change of the right side of the working plane, the digital display meter displays the height change value of the right side of the working plane, and an angle value is calculated according to the height change value. The device is convenient to use, stable in structure and capable of measuring high-precision small-angle values.

Description

Technical Field

[0001] The invention belongs to the technical field of measurement, and in particular relates to a high-precision small-angle measuring device. Background Art

[0002] As a standard instrument in length measurement, small angle measuring devices are widely used in scientific research units such as national defense metrology institutions at all levels, military metrology units, and provincial and municipal metrology institutes. They are essential instruments for the verification / calibration of angle instruments such as frame level, strip level, and coincident level. The traditional small angle inspection instrument uses a bridge-shaped workbench as the basic structure, and is equipped with indicating devices such as micrometers and optical meters on its fixed axis spacing. During operation, gauge blocks are used to adjust the inclination of the workbench to reproduce a specific standard angle. Every time the angle needs to be adjusted, different gauge blocks must be combined according to the required angle. However, this combination is not simple and direct, and requires careful selection and matching, and continuous angle adjustment cannot be achieved. For example, to reproduce a small angle of 5°, it is necessary to select gauge blocks of specific specifications and place them on the workbench in a certain combination, and then observe the indicating device to determine whether the expected angle has been reached. The measurement process is complicated and cumbersome, which greatly limits work efficiency and quality. Summary of the invention

[0003] The purpose of the present invention is to provide a high-precision small-angle measuring device which is easy to use and has a stable structure and can measure high-precision small-angle values.

[0004] One aspect of the present invention provides a high-precision small-angle measuring device, comprising a flat plate, a bearing, a left supporting mechanism, a right supporting mechanism, a motor driving device, a working plane, a height measuring device and a digital display, wherein the bearing, the left supporting mechanism, the right supporting mechanism, the motor driving device, the height measuring device and the digital display are fixed on the flat plate, the center of the working plane is supported by the bearing, and the left and right sides are supported by the left supporting mechanism and the right supporting mechanism respectively, the working plane comprises a beam and a working surface fixed on the beam, the beam can rotate around the bearing, and the motor driving device comprises a motor and a reducer;

[0005] The left supporting mechanism includes a left top circle, a push rod and a spring, wherein the circular surface of the left top circle is tangent to the left bottom of the beam, the bottom of the left top circle is connected to the top of the push rod, and the bottom of the push rod is connected to the spring, and the push rod can be driven to move upward or downward in the vertical direction by releasing or compressing the spring;

[0006] The right supporting mechanism includes a right top circle, a spline shaft, a precision screw, a flange, a first sleeve, and a second sleeve, wherein the circular surface of the right top circle is tangent to the right bottom of the beam, the bottom of the right top circle is connected to the top of the spline shaft, the top of the first sleeve is fixed to the bottom of the precision screw, the bottom of the first sleeve is fixed to the output shaft of the reducer, the bottom of the spline shaft and the top of the precision screw are connected to the top of the second sleeve, the bottom of the second sleeve is fixed to the flange, and the reducer is driven by the motor to rotate, so that the precision screw can rotate in the vertical direction, and the spline shaft is driven up and down by the flange and the second sleeve, so that the height of the right side of the working plane changes;

[0007] The height measuring device is used to measure the height change on the right side of the working plane, and the digital display is used to display the height change value on the right side of the working plane, and calculate the angle value according to the height change value.

[0008] Preferably, the bearing includes a stepped shaft, a bearing seat, a ball bearing and a bearing cover. The stepped shaft passes through the center hole of the beam, is fixed on both sides of the bearing seat, and is respectively equipped with ball bearings. The outer side of the ball bearing is fixed by the bearing cover, so that the beam can rotate around the stepped shaft without moving.

[0009] Preferably, the right supporting mechanism also includes a spline sleeve, an upper cover and an outer sleeve, wherein the spline sleeve plays a guiding role in the right supporting mechanism to ensure that the spline shaft only moves upward or downward in the vertical direction; the top of the spline sleeve is limited by the upper cover, and the bottom is limited by the outer sleeve, so that the spline sleeve does not move in the right supporting mechanism.

[0010] Preferably, the left supporting mechanism also includes a linear bearing, a first sleeve and a second sleeve. The linear bearing plays a guiding role in the left supporting mechanism to ensure that the push rod only moves upward or downward in the vertical direction. The top of the linear bearing is limited by the second sleeve and the bottom is limited by the first sleeve, so that the linear bearing does not produce displacement in the left supporting mechanism.

[0011] Preferably, the working plane further includes a working surface fixing member and a first fastening screw, and the working surface is a ribbed working surface, and the ribbed working surface is fixed to the beam by the working surface fixing member and the first fastening screw.

[0012] Preferably, the height measuring device comprises a sensor, a bent support, a sensor bracket and a top screw, the bottom of the bent support is fixed on the flat plate, the top of the bent support is fixed to the sensor bracket, and the sensor is fixed to the sensor bracket by a top screw.

[0013] Preferably, it also includes an instrument fixing device for fixing a spirit level for leveling, the instrument fixing device includes a fixed table top, a top block and a second fastening screw, the fixed table top is fixed to the beam by the top block and the second fastening screw, the fixed table top is in the same plane with the working surface, and the flatness is not greater than 3μm.

[0014] Preferably, the flatness of the plate is no greater than 5 μm, and the flatness of the working surface within the central 60 mm range is no greater than 1 μm.

[0015] The high-precision small-angle measuring device according to the above aspect of the present invention is easy to use and has a stable structure, and can measure high-precision small angle values. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work:

[0017] Figure 1 This is a front view of a high-precision small-angle measuring device according to an embodiment of the present invention;

[0018] Figure 2 This is a front view of a bearing of a high-precision small-angle measuring device according to an embodiment of the present invention;

[0019] Figure 3 is a cross-sectional view of a left support mechanism of a high-precision small-angle measuring device according to an embodiment of the present invention;

[0020] Figure 4 is a cross-sectional view of a right support mechanism of a high-precision small-angle measuring device according to an embodiment of the present invention;

[0021] Figure 5 is a side view of a high-precision small-angle measuring device according to an embodiment of the present invention;

[0022] Among them: 1-plate, 2-bearing, 3-left support mechanism, 4-right support mechanism, 5-motor drive device, 6-working plane, 7-instrument fixing device, 8-height measuring device, 9-digital display, 10-step shaft, 11-bearing seat, 12-ball bearing, 13-bearing cover, 14-left top circle, 15-linear bearing, 16-push rod, 17-spring, 18-first sleeve, 19-second sleeve, 20-spline sleeve, 21- Spline shaft, 22-precision screw, 23-flange, 24-first sleeve, 25-second sleeve, 26-upper cover, 27-outer cover, 28-motor, 29-reducer, 30-beam, 31-working surface, 32-working surface fixings, 33-first fastening screws, 34-fixed table, 35-top block, 36-second fastening screws, 37-sensor, 38-bent support, 39-sensor bracket, 40-top screw, 41-right top circle. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The embodiment of the present invention provides a high-precision small angle measurement device, such as Figure 1-5 As shown, a high-precision small-angle measuring device according to an embodiment of the present invention includes a plate 1, a bearing 2, a left supporting mechanism 3, a right supporting mechanism 4, a motor driving device 5, a working plane 6, a height measuring device 8 and a digital display 9.

[0025] The bearing 2, the left support mechanism 3, the right support mechanism 4, the motor drive device 5, the height measuring device 8 and the digital display 9 are fixed on the plate 1 by screws, and the flatness of the plate 1 is less than 5μm. The center of the working plane 6 is supported by the bearing 2, and the left and right sides are supported by the left support mechanism 3 and the right support mechanism 4 respectively. The working plane 6 includes a beam 30 and a working surface 31 fixed on the beam 30.

[0026] exist Figure 2 In the embodiment, the bearing 2 includes a stepped shaft 10, a bearing seat 11, a ball bearing 12 and a bearing cover 13. The stepped shaft 10 passes through the central hole of the beam 30, and is fixed on the bearing seat 11 on both sides and is respectively equipped with ball bearings 12. The outer side of the ball bearing 12 is fixed by the bearing cover 13, so that the beam 30 can rotate around the stepped shaft 10 without moving.

[0027] exist Figure 3In the embodiment of the left support mechanism 3, the left top circle (top circular component on the left side) 14, a linear bearing 15, a push rod 16, a spring 17, a first sleeve 18 and a second sleeve 19. The circular surface of the left top circle 14 is tangent to the left bottom of the beam 30, the bottom of the left top circle 14 and the top of the push rod 16 are connected by threads, and the bottom of the push rod 16 is connected to the spring 17. The release or compression of the spring 17 can drive the push rod 16 to move upward or downward in the vertical direction. Specifically, when the working plane 6 is in a balanced position, the spring 17 is in a compressed state in the first sleeve 18. When the working plane 6 is displaced, the spring 17 will be released or continue to be compressed, driving the push rod 16 to move upward or downward in the vertical direction, so that the circular surface of the left top circle 14 of the left support mechanism 3 is always tangent to the left bottom of the beam 30.

[0028] The linear bearing 15 plays a guiding role in the left supporting mechanism 3, ensuring that the push rod 16 only moves upward or downward in the vertical direction. The top of the linear bearing 15 is limited by the second sleeve 19, and the bottom is limited by the first sleeve 18, so that the linear bearing 15 does not move in the left supporting mechanism 3.

[0029] exist Figure 4 In the embodiment of the invention, the right supporting mechanism 4 comprises a right top circle (top circular part on the right side) 41, a spline sleeve 20, a spline shaft 21, a precision screw 22, a flange 23, a first sleeve 24, a second sleeve 25, an upper cover 26 and a sleeve 27. The circular surface of the right top circle 41 is tangent to the bottom of the right side of the beam 30, and the right top circle 41 and the spline shaft 21 are connected by the bottom thread; the top of the first sleeve 24 is fixed to the bottom of the precision screw 22 by a pin, and the bottom is fixed to the output shaft of the reducer 29 by a pin; the bottom of the spline shaft 21 and the top of the precision screw 22 are connected to the top of the second sleeve 25 by a pin, and the bottom of the second sleeve 25 is fixed to the flange 23 by bolts; when the motor 28 drives the reducer 29 to rotate, the precision screw 22 rotates in the vertical direction without moving, and the flange 23 and the second sleeve 25 drive the spline shaft 21 to move up and down, so that the right side of the working plane is raised or lowered, resulting in height changes. The digital display table 9 is used to display the height change value of the right side of the working plane 6, and calculate the accurate angle value according to the height change value of the right side of the working plane 6 and the effective length of the working plane 6.

[0030] The spline sleeve 20 plays a guiding role in the right support mechanism 4, ensuring that the spline shaft 21 only moves upward or downward in the vertical direction. The top of the spline sleeve 20 is limited by the upper cover 26, and the bottom is limited by the outer sleeve 27, so that the spline sleeve 20 does not move in the right support mechanism 4.

[0031] The pitch of the precision screw 22 is 0.25 mm. When the output shaft of the reducer 29 rotates a fixed number of circles, the spline shaft 21 can be raised or lowered to a precise height.

[0032] The motor drive device 5 includes a motor 28 and a reducer 29. The reducer 29 is fixed on the flat plate 1 by bottom screws.

[0033] The working plane 6 may further include a working surface fixing member 32 and a first fastening screw 33. The working surface 31 may be a ribbed working surface, and the ribbed working surface 31 is fixed to the beam 30 by the working surface fixing member 32 and the first fastening screw 33.

[0034] The processing requirement of the working surface 31 is that the flatness within the range of 60 mm in the center of the workbench is not greater than 1 μm, and no depression is allowed.

[0035] The fixing table 34 and the working surface 31 are in the same plane, and the flatness thereof is required to be no greater than 3 μm, and no protrusions are allowed.

[0036] The height measuring device 8 includes a sensor 37 , a bent support 38 , a sensor bracket 39 and a top screw 40 . The bottom of the bent support 38 is fixed to the flat plate 1 by screws, and the sensor bracket 39 is fixed to the top. The sensor 37 is fixed to the sensor bracket 39 by the top screw 40 .

[0037] The distance between the axes of the sensor 37 is within the range of (500±0.05) mm, the parallelism of the axes is not greater than 0.02 mm over a length of 100 mm, and the graduation value is 0.021 μm.

[0038] The high-precision small-angle measuring device of the embodiment of the present invention may further include an instrument fixing device 7 for fixing a leveling instrument for leveling. The instrument fixing device 7 includes a fixing table 34, a top block 35, and a second fastening screw 36, and the fixing table 34 is fixed to the beam 30 through the top block 35 and the second fastening screw 36.

[0039] The working principle of the high-precision small-angle measuring device in the embodiment of the present invention is as follows: the right supporting mechanism is fixed to the motor driving device by screws, and the motor driving device drives the precision screw in the right supporting mechanism to rotate. Since the top circle in the right supporting mechanism supports the bottom of the beam, one side of the working plane will rise or fall. The height measuring device above the working plane will measure the height change of the working plane and transmit the data to the digital display. The digital display records the data and calculates, thereby obtaining a high-precision small angle value.

[0040] The high-precision small-angle measuring device of the embodiment of the present invention has the following beneficial effects:

[0041] 1. The high-precision small-angle measuring device of the present invention adopts a motor-driven support mechanism precision screw to move up and down, and is equipped with a grating sensor, which has high precision. In addition, the present invention adopts a symmetrical structure, and the device has strong stability. It can realize high-precision automatic measurement of small angle values ​​and is easy to operate, which greatly improves the verification / calibration efficiency of angle instruments such as frame-type levels, strip-type levels, and combined image levels.

[0042] 2. The high-precision small-angle measuring device of the present invention is measurable and meets the existing national verification regulations and standards.

[0043] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A high-precision small angle measuring device, characterized in that: It includes a flat plate, a bearing, a left supporting mechanism, a right supporting mechanism, a motor driving device, a working plane, a height measuring device and a digital display, wherein the bearing, the left supporting mechanism, the right supporting mechanism, the motor driving device, the height measuring device and the digital display are fixed on the flat plate, the center of the working plane is supported by the bearing, and the left and right sides are supported by the left supporting mechanism and the right supporting mechanism respectively, the working plane includes a beam and a working surface fixed on the beam, the beam can rotate around the bearing, and the motor driving device includes a motor and a reducer; The left supporting mechanism includes a left top circle, a push rod and a spring, wherein the circular surface of the left top circle is tangent to the left bottom of the beam, the bottom of the left top circle is connected to the top of the push rod, and the bottom of the push rod is connected to the spring, and the push rod can be driven to move upward or downward in the vertical direction by releasing or compressing the spring; The right supporting mechanism includes a right top circle, a spline shaft, a precision screw, a flange, a first sleeve, and a second sleeve, wherein the circular surface of the right top circle is tangent to the right bottom of the beam, the bottom of the right top circle is connected to the top of the spline shaft, the top of the first sleeve is fixed to the bottom of the precision screw, the bottom of the first sleeve is fixed to the output shaft of the reducer, the bottom of the spline shaft and the top of the precision screw are connected to the top of the second sleeve, the bottom of the second sleeve is fixed to the flange, and the reducer is driven by the motor to rotate, so that the precision screw can rotate in the vertical direction, and the spline shaft is driven up and down by the flange and the second sleeve, so that the height of the right side of the working plane changes; The height measuring device is used to measure the height change on the right side of the working plane, and the digital display is used to display the height change value on the right side of the working plane, and calculate the angle value according to the height change value.

2. The high-precision small-angle measuring device according to claim 1, characterized in that: The bearing includes a stepped shaft, a bearing seat, a ball bearing and a bearing cover. The stepped shaft passes through the center hole of the beam, and is fixed on the bearing seats on both sides and is respectively equipped with ball bearings. The outer side of the ball bearing is fixed by the bearing cover, so that the beam can rotate around the stepped shaft without moving.

3. The high-precision small-angle measuring device according to claim 1 or 2, characterized in that: The right support mechanism also includes a spline sleeve, an upper cover and an outer sleeve. The spline sleeve plays a guiding role in the right support mechanism to ensure that the spline shaft only moves upward or downward in the vertical direction; the top of the spline sleeve is limited by the upper cover, and the bottom is limited by the outer sleeve, so that the spline sleeve does not move in the right support mechanism.

4. The high-precision small-angle measuring device according to claim 1 or 2, characterized in that: The left supporting mechanism also includes a linear bearing, a first sleeve and a second sleeve. The linear bearing plays a guiding role in the left supporting mechanism to ensure that the push rod only moves upward or downward in the vertical direction. The top of the linear bearing is limited by the second sleeve and the bottom is limited by the first sleeve, so that the linear bearing does not produce displacement in the left supporting mechanism.

5. The high-precision small-angle measuring device according to claim 1 or 2, characterized in that: The working plane also includes a working surface fixing piece and a first fastening screw. The working surface is a ribbed working surface, and the ribbed working surface is fixed to the beam through the working surface fixing piece and the first fastening screw.

6. The high-precision small-angle measuring device according to claim 1 or 2, characterized in that: The height measuring device comprises a sensor, a curved support, a sensor bracket and a top screw. The bottom of the curved support is fixed on the flat plate, the top of the curved support is fixed to the sensor bracket, and the sensor is fixed to the sensor bracket through the top screw.

7. The high-precision small-angle measuring device according to claim 1 or 2, characterized in that: It also includes an instrument fixing device for fixing a level meter for leveling, the instrument fixing device includes a fixed table, a top block and a second fastening screw, the fixed table is fixed to the beam by the top block and the second fastening screw, the fixed table and the working surface are in the same plane, and the flatness is not greater than 3μm.

8. The high-precision small-angle measuring device according to claim 1 or 2, characterized in that: The flatness of the plate is not greater than 5μm, and the flatness of the working surface within the central 60mm range is not greater than 1μm.

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