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CN-121977429-A - Axle type work piece centre bore detects instrument

CN121977429ACN 121977429 ACN121977429 ACN 121977429ACN-121977429-A

Abstract

The utility model provides a detection tool of axle type work piece centre bore, includes top, top's front end is circular cone portion, rear end is circular cylinder portion, including the conical tip section that is used for inserting work piece centre bore and radial spout that runs through the circular cone side on the circular cone portion, circular cylinder portion is equipped with an axle center hole and spout intercommunication, a removal detection piece sliding fit in the spout, the spout leaves the distance that removal detection piece moved back and forth along top axial, the opening that the removal detection piece both sides outwards extended out the spout both sides is as measuring part, the rear end of removal detection piece is equipped with the locating plug that extends backward, top passes through circular cylinder portion and installs at a adapter sleeve front end, adapter sleeve rear end fixed connection displacement sensor, set up an elastic push rod in the axial through-hole of adapter sleeve, the front end of elastic push rod is connected with the locating plug of removal detection piece in the spout sliding fit and stretching into circular cone portion, the rear end and the gauge head contact of displacement sensor measuring rod.

Inventors

  • WU CHANGLIN
  • HUANG YUXIANG

Assignees

  • 重庆瀚辉机械制造有限公司

Dates

Publication Date
20260505
Application Date
20260204

Claims (6)

  1. 1. The tool for detecting the center hole of the shaft workpiece comprises a center (2), and is characterized in that the front end of the center (2) is a conical part (2-1) and the rear end is a cylindrical part (2-3), the conical part (2-1) comprises a conical tip section (2-11) for being inserted into the center hole of the workpiece and a chute (2-2) penetrating through the side surface of the cone in the radial direction, the axial length of the conical tip section (2-11) is smaller than the depth of the center hole of the workpiece, the cylindrical part (2-3) is provided with an axial center hole (2-4) communicated with the chute (2-2), a movement detection block (1) is slidably matched in the chute (2-2), the chute (2-2) is axially provided with a distance for moving the movement detection block (1) back and forth along the center (2), openings at two sides of the movement detection block (1) are used as measuring parts (1-1), the front end of the measuring part (1-1) is a straight surface for being contacted with the workpiece, the rear end of the movement detection block (1) is provided with a rear end (1) and is fixedly connected with a connecting sleeve (3) through a rear end (2-3), an elastic push rod (5) is arranged in an axial through hole of the connecting sleeve (3), the front end of the elastic push rod (5) is in sliding fit with an axle center hole (2-4) of the cylindrical part (2-2) and stretches into a sliding groove (2-2) of the conical part to be connected with a positioning plug (1-2) of the movement detection block (1), the rear end of the elastic push rod (5) is in contact with a measuring head of a measuring rod (6) of a displacement sensor (8), and the displacement sensor (8) is provided with a data output port (9).
  2. 2. The tool for detecting the center hole of the shaft workpiece according to claim 1, wherein the elastic push rod (5) comprises a shaft rod (5-1) and a return spring (4), a limit flange (5-2) which is in sliding fit with an axial through hole of the connecting sleeve (3) is arranged at the middle section of the shaft rod (5-1), an axial hole (5-3) for inserting and positioning a positioning plug (1-2) of the moving detection block (1) is arranged at the front section of the shaft rod (5-1), and the return spring (4) is sleeved on the rear section of the shaft rod (5-1).
  3. 3. The tool for detecting the center hole of the shaft workpiece according to claim 1 or 2, wherein the axial through hole of the connecting sleeve (3) is a four-stage stepped hole and comprises a large-diameter hole (3-1), an intermediate-diameter large hole (3-2), an intermediate-diameter small hole (3-3) and a small-diameter hole (3-4), the large-diameter hole (3-1) at the front end is used for inserting the cylindrical part (2-3) of the center point (2), the small-diameter hole (3-4) at the rear end is used for inserting the measuring end of the displacement sensor (8), the intermediate-diameter large hole is in sliding fit with the limiting flange (5-2) of the elastic push rod (5), the intermediate-diameter small hole (3-3) is in sliding fit with the rear end of the elastic push rod (5), the return spring (4) is located in the intermediate-diameter large hole (3-2), the front end is limited by the limiting flange (5-2), and the rear end is limited by the hole shoulder between the intermediate-diameter large hole (3-2) and the intermediate-diameter small hole (3-3).
  4. 4. The tool for detecting the central hole of the shaft workpiece according to claim 1, wherein the outer circle of the cylindrical part (2-3) at the rear end of the center (2) is provided with a V-shaped annular groove (2-5), a first threaded through hole is radially formed in the side wall of the front end of the axial through hole of the connecting sleeve (3) and corresponds to the V-shaped annular groove (2-5), the cylindrical part (2-3) of the center (2) is inserted into the front end of the axial through hole of the connecting sleeve (3), and a first set screw (10) is in threaded fit in the first threaded through hole and is inserted into the V-shaped annular groove (2-5) to form shaft positioning fixation.
  5. 5. The tool for detecting the central hole of the shaft workpiece according to claim 1, wherein a second threaded through hole is radially formed in the side wall of the rear end of the axial through hole of the connecting sleeve (3), a fixed sleeve (8-1) at the front end of the shell of the displacement sensor (8) is inserted into the rear end of the axial through hole of the connecting sleeve (3), the fixed sleeve (8-1) at the front end of the shell of the displacement sensor (8) is locked from the second threaded through hole by a second set screw (7), and the displacement sensor (8) is fixedly connected to the rear end of the connecting sleeve (3), so that a measuring head of a measuring rod (6) of the displacement sensor (8) is in contact with the rear end of the elastic push rod (5).
  6. 6. The tool for detecting the center hole of the shaft workpiece according to claim 1, wherein openings on two sides of the sliding groove (2-2) on the conical portion (2-1) are rectangular, and long sides of the openings extend from the conical bottom of the conical portion (2-1) to the bottom of the conical tip section (2-11).

Description

Axle type work piece centre bore detects instrument Technical Field The invention relates to the field of axle workpiece center hole detection tools, in particular to an axle workpiece center hole detection tool. Background The center hole is a positioning reference for processing shaft parts. If the sizes of the center holes are inconsistent, the axial position of the part is easy to fluctuate when the center holes are used for positioning and processing, and the problems of waste products or cutter collision during subsequent process processing are caused. The existing method for detecting the size of the central hole of the shaft workpiece comprises a direct measurement method and an indirect measurement method, wherein the direct measurement method is simple and convenient, the aperture of the central hole is directly detected by using a caliper, but the direct measurement error by using the caliper is large and low in efficiency because the central hole is a conical hole. The indirect measurement method of the steel ball height adopts an inner taper hole end surface diameter measuring instrument, a countersink gauge and a center hole depth measuring gauge to detect the aperture of the center hole. The measuring instruments are hand-held meter reading measuring tools, are used for manually detecting hole by hole, have low efficiency, influence the detection precision by human factors, are not suitable for batch production scenes, and cannot be used for automatic full detection. The patent document with the publication number of CN113983887A discloses a camshaft center hole size detection clamp, which has more parts and complex structure, indirectly transmits detection values through a lever, adopts a dial indicator for reading, has large detection error and cannot be used for detecting the center hole of a shaft workpiece with high precision requirement. The patent document with the publication number of CN 213657746U discloses a crankshaft center hole gauge which consists of a sleeve 1 and a conical rod 2, wherein during use, pigment is coated on a front end center conical head 21 of the conical rod 2 or on a crankshaft center hole, the conical rod 2 is penetrated into an inner hole of the sleeve 1, a front end surface 1a of the sleeve 1 is abutted against the crankshaft end surface, the inner hole of the sleeve 1 is aligned with the crankshaft center hole, the conical rod 2 is pushed to enable the front end center conical head 21 to be inserted into the crankshaft center hole, the conical rod 2 is rotated through a rear end tail rod 23, after the front end center conical head 21 rotates in the crankshaft center hole (more than one circle), the concave table surface 22a and the convex table surface 22b on a rear end surface 220 of a middle post rod 22 are fully contacted with the rear end surface 1b of the sleeve 1, and whether the center hole is large or not is judged by means of the relative position of a rear end table surface of the conical rod and the rear end surface of the sleeve is only detected by hand, and the judgment error is relatively large, and the gauge is not suitable for detecting the center holes of shaft workpiece center holes with high precision requirements, and the gauge is only can be used for detecting the center holes with a universal gauge. Therefore, there is a need for a detection tool that can improve the accuracy of detecting the center hole of a shaft-like workpiece. Disclosure of Invention The invention aims to provide a tool for detecting a central hole of a shaft workpiece, aiming at the corresponding defects of the prior art. The center can directly detect the aperture of the central hole of the shaft workpiece and obtain data. The invention aims at realizing the detection tool of the center hole of the shaft workpiece, which comprises a center, wherein the front end of the center is a conical part, the rear end of the center is a cylindrical part, the conical part comprises a conical tip section for being inserted into the center hole of the workpiece and a chute penetrating through the side surface of the cone in the radial direction, the axial length of the conical tip section is smaller than the depth of the center hole of the workpiece, the cylindrical part is provided with an axial hole communicated with the chute, a movement detection block is in sliding fit in the chute, the chute is axially provided with a distance for the movement detection block to move forwards and backwards along the center, two sides of the movement detection block extend out of the openings on two sides of the chute to serve as measuring parts, the front end of the measuring part is a straight surface and is used for contacting the workpiece, the rear end of the movement detection block is provided with a positioning plug extending backwards, the center is arranged at the front end of a connecting sleeve through the cylindrical part, the rear end of the connecting sleeve is fixedly con