An inside circle measuring device and a measuring method thereof

Abstract

The present application relates to the technical field of machining, particularly relates to a large rotary workpiece inner circle measuring device and a measuring method thereof. The inner circle measuring device comprises a position adjusting unit, a support shaft connecting unit, a laser centering unit, a joint arm measuring head and a rotating handle. The rotating handle is fixedly connected with the support shaft connecting unit. The position adjusting unit is connected with the support shaft connecting unit through a fastening screw. The support shaft connecting unit penetrates through the laser centering unit. The laser centering unit can slide along the support shaft connecting unit. The support shaft connecting unit is hingedly connected with the joint arm measuring head. The device has simple structure, convenient operation, high safety and low manufacturing cost. The device can quickly measure rotary size characteristics and the measurement result is accurate.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a measuring device and method for measuring the inner circle of large rotating workpieces. Background Technology

[0002] In the mechanical design and machining industry of large rotating parts, circumferential runout is a very important characteristic parameter. Circumferential runout directly reflects the design and operational accuracy of rotating workpieces and the machining accuracy of their dimensional features. There are generally two methods for measuring circumferential runout. One method involves measuring on a machine tool using a rotary table or rotary machining axis with a dial indicator. However, this method has significant limitations; the workpiece must be placed on the machine tool for measurement, which is labor-intensive and resource-intensive. Measurement cannot be performed without suitable machine tools. The second method utilizes digital measuring instruments such as laser trackers, measuring arms, and coordinate measuring machines (CMMs). The biggest advantages of these instruments are high measurement accuracy, the ability to measure a wide range of dimensions, and the ability to evaluate spatial form and position tolerances. However, they are expensive, require dedicated inspection personnel, and the limited inspection range of CMMs and measuring arms deters many small and medium-sized enterprises. Summary of the Invention

[0003] Based on the above-mentioned problems, this invention provides an internal circle measuring device, which solves the problem that the measurement of internal circle runout of large rotating workpieces is heavily dependent on machine tools and advanced, expensive digital inspection equipment.

[0004] The objective of this invention is achieved as follows: an inner circle measuring device, comprising a position adjustment unit, a support shaft connecting unit, a laser centering unit, an articulated arm measuring head, and a rotating handle, wherein the rotating handle is fixedly connected to the support shaft connecting unit, the position adjustment unit is connected to the support shaft connecting unit by fastening screws, the support shaft connecting unit passes through the laser centering unit, the laser centering unit is slidable along the support shaft connecting unit, and the support shaft connecting unit is hinged to the articulated arm measuring head.

[0005] In one embodiment, the position adjustment unit consists of a base, a large slider, a small slider, and a limiting device.

[0006] In one embodiment, the base and the large slider are slidably connected via a slot, and the large slider and the small slider are slidably connected via a slot.

[0007] In one embodiment, the small slider is provided with a limiting hole, and the limiting device is used to limit the position of the small slider.

[0008] In one embodiment, a scale is provided on the side wall where the base connects to the large slider, for positioning the large slider.

[0009] In one embodiment, a scale is provided on the side wall where the large slider and the small slider are connected, for positioning the position of the small slider.

[0010] In one embodiment, the laser centering unit consists of a laser emitter, an adjustment track, fasteners, and a sleeve.

[0011] In one embodiment, the adjustment track is vertically mounted on the sleeve, and the adjustment track is provided with a sliding groove. The laser emitter can slide along the sliding groove, and the fastener is used to fix the position of the laser emitter on the sliding groove.

[0012] In one embodiment, the articulated arm measuring head includes a fastening assembly and a first articulated arm and a second articulated arm, the first articulated arm and the second articulated arm being hinged together by the fastening assembly, and the first articulated arm being hinged to the support shaft connection unit by the fastening assembly.

[0013] In one embodiment, the measurement method of the inner circle measuring device includes the following steps:

[0014] S1: First, place the workpiece to be measured and the inner circle measuring device on the work platform;

[0015] S2: Rotate the laser centering unit to observe the height of the laser point of the laser emitter on the inner circle surface of the workpiece being measured, and adjust it in conjunction with the position adjustment unit to make the inner circle measuring device coaxial with the workpiece being measured, and then tighten the limit screw;

[0016] S3: Adjust the positions of the first joint arm and the second joint arm so that the dial indicator stylus contacts the inner circular surface of the workpiece being measured, and adjust the dial indicator pointer to zero.

[0017] S4: Rotate the rotary handle to make the dial indicator stylus move in a circular motion along the inner surface of the workpiece being measured, visually observe the pointer jump of the dial and record and evaluate the specific jump value.

[0018] The device of this invention has a simple structure, is easy to operate, has high safety and low manufacturing cost, and can quickly measure the dimensional characteristics of rotational objects with accurate measurement results. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an internal circle measuring device.

[0020] Figure 2 This is a schematic diagram of the internal circle measuring device.

[0021] Figure 3 This is a schematic diagram of the laser centering unit structure;

[0022] Figure 4 Schematic diagram of the articulated arm measuring head structure;

[0023] Figure 5 This is a schematic diagram of the position adjustment unit structure;

[0024] Figure 6 This is a schematic diagram of the supporting shaft unit structure;

[0025] 100 - Workpiece to be measured; 200 - Inner circle measuring device; 210 - Position adjustment unit; 211 - Base; 212 - Large slider; 213 - Small slider; 214 - Limiting device; 220 - Support shaft connection unit; 221 - Bearing; 230 - Laser centering unit; 231 - Laser emitter; 232 - Adjustment track; 233 - Sleeve; 240 - Articulated arm measuring head; 241 - First articulated arm; 242 - Second articulated arm; 243 - Dial indicator; 244 - Fastening assembly; 250 - Rotary handle; 300 - Worktable. Detailed Implementation

[0026] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0027] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," "top," "bottom," "end," "top," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] An internal circle measuring device includes a position adjustment unit 210, a support shaft connection unit 220, a laser centering unit 230, an articulated arm measuring head 240, and a rotating handle 250. The rotating handle 250 is fixedly connected to the support shaft connection unit 220. The position adjustment unit 210 is connected to the support shaft connection unit 220 by fastening screws. The support shaft connection unit 220 passes through the laser centering unit 230 and is slidable along the support shaft connection unit 220. The laser centering unit 230 is disposed at the waist of the support shaft connection unit 220. The support shaft connection unit 220 is hinged to the articulated arm measuring head 240. The position adjustment unit 210 consists of a base 211, a large slider 212, a small slider 213, and a limiting device 214. The base 211 and the large slider 212 are slidably connected via a slot, and the large slider 212 and the small slider 213 are slidably connected via a slot. The small slider 213 is provided with a limiting hole, and the limiting device 214 is used to limit the position of the small slider 213. A scale is provided on the side wall where the base 211 connects to the large slider 212 for positioning the large slider 212. A scale is provided on the side wall of 212 connected to the small slider 213 for positioning the small slider 213. The scales on the large slider and the lower slider can precisely adjust the position of the measuring device from two vertical directions. The position adjustment unit 210 is used to adjust the position of the inner circle measuring device on the horizontal plane relative to the workpiece being measured, ensuring that the inner circle measuring device and the workpiece being measured are coaxially set. The laser centering unit 230 consists of a laser emitter 231, an adjustment track 232, fasteners, and a sleeve 233. The adjustment track 232 is vertically mounted on the sleeve 233. The adjustment track 232 has an "I"-shaped structure and a sliding groove. The sliding groove is a semi-circular groove and is located on the symmetrical planes on both sides of the "I"-shaped structure. The laser emitter 231 is hinged to the middle support of the "I"-shaped structure and can slide along the sliding groove. The fastener is used to fix the position of the laser emitter 231 on the sliding groove. The laser centering unit 230 moves around the support shaft connecting unit 220 or slides up and down along the support shaft connecting unit 220. The laser emitter 231 then scans the inner wall of the workpiece being measured. The position of the scanned laser is used to detect whether the inner circle measuring device is coaxial with the workpiece being measured. The sleeve 233 can drive the laser emitter 231 to rotate and cooperate with the position adjustment unit 210 to adjust the inner circle measuring device to be coaxial with the workpiece being measured.The articulated arm measuring head 240 includes a fastening assembly 244, a first articulated arm 241, and a second articulated arm 242. The first articulated arm 241 and the second articulated arm 242 are hinged together by the fastening assembly 244. The first articulated arm 241 is hinged to the support shaft connection unit 220 by the fastening assembly 244. The top of the articulated arm measuring head unit 240 is equipped with a dial indicator 243, which contacts the inner circular surface of the workpiece being measured to monitor runout changes. The support shaft connection unit 220 consists of a support shaft, a bearing, and a bearing sleeve. Its bottom flange is connected to an M8 fastening screw for position adjustment 210, and its top bearing sleeve is connected and assembled to the articulated arm measuring head 240 by the fastening assembly 244.

[0030] In one embodiment, the articulated arm measuring head includes at least two articulated arms.

[0031] The measurement method of the inner circle measuring device includes the following steps:

[0032] S1: First, place the workpiece to be measured and the inner circle measuring device on the work platform;

[0033] S2: Rotate the laser centering unit to observe the height of the laser point of the laser emitter on the inner circle surface of the workpiece being measured, and adjust it in conjunction with the position adjustment unit to make the inner circle measuring device coaxial with the workpiece being measured, and then tighten the limit screw;

[0034] S3: Adjust the positions of the first joint arm and the second joint arm so that the dial indicator stylus contacts the inner circular surface of the workpiece being measured, and adjust the dial indicator pointer to zero.

[0035] S4: Rotate the rotary handle to make the dial indicator stylus move in a circular motion along the inner surface of the workpiece being measured, visually observe the pointer jump of the dial and record and evaluate the specific jump value.

[0036] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An internal circle measuring device, characterized in that, The inner circle measuring device includes a position adjustment unit, a support shaft connection unit, a laser centering unit, an articulated arm measuring head, and a rotating handle. The rotating handle is fixedly connected to the support shaft connection unit. The position adjustment unit is connected to the support shaft connection unit by fastening screws. The support shaft connection unit passes through the laser centering unit, and the laser centering unit can slide along the support shaft connection unit. The support shaft connection unit is hinged to the articulated arm measuring head. The laser centering unit consists of a laser emitter, an adjustment track, fasteners, and a sleeve. The adjustment track is vertically arranged on the sleeve, and a groove is provided on the adjustment track. The laser emitter can slide along the groove, and the fasteners are used to fix the position of the laser emitter on the groove.

2. An inner circle measuring device as described in claim 1, characterized in that, The position adjustment unit consists of a base, a large slider, a small slider, and a limiting device.

3. An inner circle measuring device as described in claim 2, characterized in that, The base and the large slider are slidably connected via a slot, and the large slider and the small slider are slidably connected via a slot.

4. An inner circle measuring device as described in claim 2, characterized in that, The small slider is provided with a limiting hole, and the limiting device is used to limit the position of the small slider.

5. An inner circle measuring device as described in claim 2, characterized in that, A scale is provided on the side wall where the base connects to the large slider, for positioning the large slider.

6. An inner circle measuring device as described in claim 2, characterized in that, A scale is provided on the side wall where the large slider connects to the small slider, for positioning the small slider.

7. An internal circle measuring device as described in claim 1, characterized in that, The articulated arm measuring head includes a fastening assembly, a first articulated arm, a second articulated arm, and a dial indicator. The first articulated arm and the second articulated arm are hinged together by the fastening assembly. The first articulated arm is hinged to the support shaft connection unit by the fastening assembly. The dial indicator is fixedly connected to the second articulated arm.

8. A measurement method using the inner circle measuring device according to any one of claims 1-7 is as follows, characterized in that, The method includes the following steps: S1: First, place the workpiece to be measured and the inner circle measuring device on the work platform; S2: Rotate the laser centering unit to observe the height of the laser point of the laser emitter on the inner circle surface of the workpiece being measured, and adjust it in conjunction with the position adjustment unit to make the inner circle measuring device coaxial with the workpiece being measured, and then tighten the limit screw; S3: Adjust the positions of the first joint arm and the second joint arm so that the dial indicator stylus contacts the inner circular surface of the workpiece being measured, and adjust the dial indicator pointer to zero. S4: Rotate the rotary handle to make the dial indicator stylus move in a circular motion along the inner surface of the workpiece being measured, visually observe the pointer jump of the dial and record and evaluate the specific jump value.

Images