A coaxiality gauge

The system of synchronous belt and bidirectional threaded rod driven by servo motor automatically adjusts the spacing of the movable frame and fixes the workpiece, which solves the problems of inconvenient operation and low measurement accuracy of traditional coaxiality gauges, and realizes automated positioning and high-precision measurement of workpieces.

CN224455677UActive Publication Date: 2026-07-03SICHUAN HONGRONG ZHIZAO MACHINERY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SICHUAN HONGRONG ZHIZAO MACHINERY CO LTD
Filing Date
2025-07-08
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Traditional coaxiality gauges require manual adjustment during use, which is inconvenient. The workpiece is also prone to shaking, affecting measurement accuracy. Furthermore, they cannot be fixed in place, making it difficult to meet the testing needs of modern mass production.

Method used

The system employs a servo motor-driven synchronous belt and bidirectional threaded rod system to automatically adjust the spacing of the movable frame and fix the workpiece. Combined with the servo motor-driven lead screw and fixed rod, it achieves automatic positioning and stabilization of the workpiece, and uses a dial indicator to measure coaxiality.

Benefits of technology

It achieves automated positioning and stabilization of workpieces, improves measurement accuracy, simplifies operation procedures, and adapts to the detection needs of workpieces of different lengths.

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Abstract

This utility model relates to the field of coaxiality inspection fixtures, and proposes a coaxiality inspection fixture, including a device body, a mounting frame, and a first servo motor. A control panel is provided at the top of the device body. A second servo motor is mounted on the outer wall of the device body. The drive shaft of the second servo motor passes through the outer wall of the device body and is connected to a rotating shaft. A synchronous belt is mounted on the outer wall of the rotating shaft. A bidirectional threaded rod is mounted on the side of the synchronous belt away from the rotating shaft. A first movable frame and a second movable frame are movably mounted on the outer wall of the bidirectional threaded rod, respectively. A first limiting groove is provided on the outer wall of the device body. The tops of the first and second movable frames extend to the outer wall of the device body through the first limiting groove. Each of the tops of the first and second movable frames has a placement groove. This invention solves the problems in the prior art where workpieces easily shake during inspection, affecting measurement accuracy, and where adjustment according to workpiece length is inconvenient.
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Claims

1. A coaxiality gauge, comprising a device body (1), a mounting frame (6) and a first servo motor (7), characterized in that: A control panel (2) is provided at the top of the device main body (1). A second servo motor (15) is installed on the outer wall of the device main body (1). The drive shaft of the second servo motor (15) penetrates the outer wall of the device main body (1) and is connected to a rotating shaft (12). A synchronous belt (13) is installed on the outer wall of the rotating shaft (12). One side of the synchronous belt (13) away from the rotating shaft (12) is installed with a bidirectional threaded rod (14). A first movable frame (4) and a second movable frame (16) are respectively movably installed on the outer wall of the bidirectional threaded rod (14). A first limiting groove (5) is provided on the outer wall of the device main body (1). The tops of the first movable frame (4) and the second movable frame (16) extend to the outer wall of the device main body (1) through the first limiting groove (5). Placing grooves (17) are provided at the tops of the first movable frame (4) and the second movable frame (16). A workpiece main body (10) is movably installed on the tops of the first movable frame (4) and the second movable frame (16) through the placing grooves (17). A probe (18) is installed at the bottom of the placing groove (17). A dial indicator (11) is installed on the side wall of the placing groove (17). The probe (18) is connected to the dial indicator (11). An installation frame (6) is provided on the outer wall of the device main body (1). A second limiting groove (21) is provided on the inner wall of the installation frame (6). A first servo motor (7) is installed at the top of the installation frame (6). The drive shaft of the first servo motor (7) penetrates the outer wall of the installation frame (6) and extends into the second limiting groove (21) and is connected to a screw rod (22). A threaded sleeve (23) is movably installed on the outer wall of the screw rod (22). Both ends of the threaded sleeve (23) extend to the outer wall of the installation frame (6) through the second limiting groove (21) and are welded with installation blocks (8). A fixing rod (9) is movably installed at the bottom end of the installation block (8) through a bearing.

2. A coaxiality gauge according to claim 1, wherein The outer wall of the bidirectional threaded rod (14) is symmetrically provided with external threads with opposite directions. A threaded hole matching the external threads is provided at the bottom end of the first movable frame (4).

3. A coaxiality gauge according to claim 1, wherein A measuring block (3) is installed on the outer wall at the top of the device main body (1). Chute grooves (20) are symmetrically provided on the outer walls on both sides of the measuring block (3).

4. A coaxiality gauge according to claim 3, wherein Sliders (19) are provided at the bottom ends of the first movable frame (4) and the second movable frame (16). The sliders (19) are fitted with the chute grooves (20).

5. The coaxiality gauge of claim 1, wherein, The cross section of the threaded sleeve (23) is in a Chinese character 'zhong' shape, and the threaded sleeve (23) is matched with the second limiting groove (21).

6. A coaxiality inspection tool according to claim 1, characterized in that, The outer wall of the screw rod (22) is provided with external threads, and an internal thread matching the external threads is provided at the central position of the threaded sleeve (23).

7. The coaxiality gauge of claim 1, wherein, The fixing rod (9) is in a cylindrical shape and is located directly above the workpiece main body (10).

8. The coaxiality gauge of claim 1, wherein, The placing groove (17) is in a chamfered concave structure, and the probe (18) is located at the central position of the bottom of the placing groove (17).