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CN-122015710-A - Non-contact optical angle measuring instrument and measuring method

CN122015710ACN 122015710 ACN122015710 ACN 122015710ACN-122015710-A

Abstract

The invention provides a non-contact optical angle measuring instrument and a measuring method, and relates to the technical field of part measurement. The problem that the relative angle of two key grooves of the part is difficult to measure by the existing measuring device due to manufacturability of the surface of the part and the specificity of the measuring environment is solved. The measuring mechanism comprises a grating code disc, a measuring microscope, a reading microscope, a microscope support and a traversing mechanism, wherein the grating code disc, the measuring microscope, the reading microscope, the microscope support and the traversing mechanism are arranged on the top surface of a base, a circle of scale values are arranged on the surface, close to one side of the reading microscope, of the grating code disc, the measuring microscope is perpendicular to the axis of the grating code disc, the reading microscope is parallel to the axis of the grating code disc, a lens faces the scale values, and the microscope support can circumferentially rotate around the axis of the grating code disc. The device is mainly used for non-contact measurement of the relative angle between a pair of key grooves of a cylindrical workpiece.

Inventors

  • HU DIANWEN
  • XIAO YONGSHENG
  • LIU YUANXIANG

Assignees

  • 哈尔滨尧安科技有限公司

Dates

Publication Date
20260512
Application Date
20260228

Claims (10)

  1. 1. The non-contact optical angle measuring instrument is characterized by comprising a base (1), and a positioning mechanism (2), a clamping mechanism (3) and a measuring mechanism (4) which are arranged on the top surface of the base (1) in sequence in a linear manner along a first direction; The positioning mechanism (2) comprises an angular positioning pin (21) and a positioning pin bracket (22), wherein the angular positioning pin (21) is arranged on the positioning pin bracket (22) and can move transversely relative to the positioning pin bracket (22); The clamping mechanism (3) comprises a left claw (31) and a right claw (32) which are oppositely arranged, and a first traversing mechanism, wherein the first traversing mechanism can drive the left claw (31) and the right claw (32) to move and adjust the distance between the left claw (31) and the right claw (32), and a plurality of holding wheels (33) are arranged on the clamping surfaces of the left claw (31) and the right claw (32); The measuring mechanism (4) comprises a grating code disc (41), a measuring microscope (42), a reading microscope (43), a microscope support (44) and a traversing mechanism II, wherein the measuring microscope (42) and the reading microscope (43) are respectively located on two axial sides of the grating code disc (41) and are respectively arranged on the microscope support (44), the traversing mechanism II can drive the grating code disc (41) and the microscope support (44) to move along the first direction, the axis of the grating code disc (41) is parallel to the first direction, a circle of scale value is arranged on the surface, close to one side of the reading microscope (43), of the grating code disc (41), the 0' scale line of the scale value is identical to the central line of the angular positioning pin (21) in height and is parallel to each other, the measuring microscope (42) is perpendicular to the axis of the grating code disc (41), the reading microscope (43) is parallel to the axis of the grating code disc (41), and faces the scale value, and the lens can rotate around the axis of the grating code disc (41) of the microscope support (44).
  2. 2. A non-contact optical angle measuring device according to claim 1, characterized in that the pin holder (22) is a Y-shaped holder, and the angular pin (21) is mounted on one branch of the top end of the Y-shaped holder.
  3. 3. The non-contact optical angle measuring instrument according to claim 1, wherein the clamping surfaces of the left jaw (31) and the right jaw (32) are respectively provided with two holding wheels (33) which are arranged in rectangular four corners.
  4. 4. The non-contact optical angle measuring instrument according to claim 1, wherein the first traversing mechanism comprises a first slide rail (34), a first ball screw (35) and a first screw seat (36), the first slide rail (34) and the first screw seat (36) are both installed on the top surface of the base (1), the first ball screw (35) is installed in the first screw seat (36), the first slide rail (34) is parallel to the first ball screw (35), and the first left jaw (31) and the second jaw (32) are both in sliding connection with the first slide rail (34) and are both in threaded connection with the first ball screw (35).
  5. 5. The non-contact optical angle measuring instrument according to claim 4, wherein a handle (37) is mounted at one end of the ball screw (35), and the screw seat (36) is provided with a locking screw (38).
  6. 6. A non-contact optical angle measuring device according to claim 1, wherein the graduation values are 1440 graduation marks in total, the angle between adjacent graduation marks is 0.25 degrees, and the reticle grid value of the reading microscope (43) is 0.025 degrees.
  7. 7. The non-contact optical angle measuring instrument according to claim 1, wherein the second traverse mechanism comprises a second slide rail (45), a second ball screw (46), a second screw seat (47) and a sliding seat (48), the second slide rail (45) and the second screw seat (47) are both installed on the top surface of the base (1), the second ball screw (46) is installed in the second screw seat (47), the second slide rail (45) is parallel to the second ball screw (46), the bottom of the sliding seat (48) is in sliding connection with the second slide rail (45) and in threaded connection with the second ball screw (46), the grating code disc (41) is installed on the top surface of the sliding seat (48), and the microscope support (44) is connected with the sliding seat (48) and can rotate relatively.
  8. 8. The non-contact optical angle measuring instrument according to claim 7, wherein a second handle (49) is mounted at one end of the second ball screw (46), and the second screw seat (47) is provided with a second locking screw (50).
  9. 9. A non-contact optical angle measuring device according to claim 1, characterized in that the microscope stand (44) is provided with a coarse tuning screw (441) and a fine tuning screw (442).
  10. 10. A method for non-contact optical measurement of the relative angle between a pair of key ways of a cylindrical workpiece, characterized by using a non-contact optical angle measuring instrument according to any one of claims 1-9, comprising the steps of: S1, installing a workpiece, namely conveying the workpiece (A) to be measured between a left claw (31) and a right claw (32), adjusting a transverse moving mechanism to drive the left claw (31) and the right claw (32) to move close, and fixing the workpiece (A) to be measured on a clamping mechanism (3) to enable the workpiece (A) to be measured to be coaxial with a grating code disc (41); S2, positioning the workpiece, namely rotating the workpiece (A) to be measured, aligning a key slot with the angular positioning pin (21), and inserting the angular positioning pin (21) into the key slot; s3, measuring, namely adjusting a second transverse moving mechanism, and rotating a microscope bracket (44) to enable a reticle on a reticle of a measuring microscope (42) to fall on the axis of the other key slot; and S4, reading, namely reading the scale value of the grating code disc (41) by using a reading microscope (43), namely obtaining the relative angle between a pair of key grooves of the cylindrical workpiece.

Description

Non-contact optical angle measuring instrument and measuring method Technical Field The invention relates to the technical field of part measurement, in particular to a non-contact optical angle measuring instrument and a measuring method. Background A cylindrical precision part with a circular arc-shaped optical glass cover body at the head is provided with two key grooves which are not on the same plane, and a contact type measuring device and an electronic measuring device cannot be adopted due to manufacturability of the surface of the part and the specificity of a measuring environment (combustible substances are in the working environment of the part and are explosive environments), so that the existing measuring device cannot measure the relative angles of the two key grooves of the part easily. Disclosure of Invention In order to solve the technical problems, the invention provides a non-contact optical angle measuring instrument and a measuring method, wherein a grating code disc (a precise grating ruler formed by precise equal-angle radioactive reticles and digital angle values manufactured on optical glass through precise technologies such as photoetching) and an optical microscope (a reticle is arranged on the focal plane inside an eyepiece of the microscope, and scales, cross wires and digital grids are carved on the reticle) are utilized to form a measuring device, and the measuring device is a microscope which is overlapped on a sample image, so that a user can position, compare and measure the head of a part to be detected through the optical microscope, and the non-contact measuring device is of a pure mechanical structure and does not comprise electronic equipment and can be used for measuring the part in an explosive environment. The non-contact optical angle measuring instrument comprises a base, and a positioning mechanism, a clamping mechanism and a measuring mechanism which are arranged on the top surface of the base in a linear manner along a first direction in sequence; The positioning mechanism comprises an angular positioning pin and a positioning pin bracket, wherein the angular positioning pin is arranged on the positioning pin bracket and can transversely move relative to the positioning pin bracket; the clamping mechanism comprises a left claw and a right claw which are oppositely arranged, and a first traversing mechanism, wherein the first traversing mechanism can drive the left claw and the right claw to move and adjust the distance between the left claw and the right claw, and a plurality of holding wheels are arranged on the clamping surfaces of the left claw and the right claw; The measuring mechanism comprises a grating code disc, a measuring microscope, a reading microscope, a microscope support and a traversing mechanism II, wherein the measuring microscope and the reading microscope are respectively arranged on two axial sides of the grating code disc and are respectively arranged on the microscope support, the traversing mechanism II can drive the grating code disc and the microscope support to move along the first direction, the axis of the grating code disc is parallel to the first direction, a circle of scale value is arranged on the surface, close to one side of the reading microscope, of the grating code disc, the 0 scale line of the scale value is identical to the central line of the angular positioning pin in height and is parallel to each other, the measuring microscope is perpendicular to the axis of the grating code disc, the reading microscope is parallel to the axis of the grating code disc, a lens faces the scale value, and the microscope support can circumferentially rotate around the axis of the grating code disc. Furthermore, the locating pin support is a Y-shaped support, and the angular locating pin is arranged on one branch at the top end of the Y-shaped support. Furthermore, the clamping surfaces of the left clamping jaw and the right clamping jaw are respectively provided with two holding wheels which are arranged in rectangular four corners. Furthermore, the first transverse moving mechanism comprises a first sliding rail, a first ball screw and a first screw seat, the first sliding rail and the first screw seat are both arranged on the top surface of the base, the first ball screw is arranged in the first screw seat, the first sliding rail is parallel to the first ball screw, and the left clamping jaw and the right clamping jaw are both in sliding connection with the first sliding rail and are both in threaded connection with the first ball screw. Furthermore, a first handle is arranged at one end of the ball screw, and a first locking screw is arranged on the first screw seat. Furthermore, the number of the graduation marks is 1440, the included angle between the adjacent graduation marks is 0.25 degrees, and the number of the graduation marks of the reading microscope is 0.025 degrees. Still further, sideslip mechanism II includes slide rail