Digital diameter measuring instrument

Abstract

The utility model discloses a digital diameter measuring instrument, which belongs to the technical field of precision measuring instruments and is suitable for high-precision rapid detection of cylindrical workpieces. The measuring instrument comprises a shell, four fixed terminals which are symmetrically distributed in a rectangular shape, a touch display screen, a displacement sensor, a hand-held rod, a power supply module and a processor, the four fixed terminals comprise a first fixed terminal (1), a second fixed terminal (2), a third fixed terminal (3) and a fourth fixed terminal (4) which are symmetrically arranged at the bottom of the shell to form a measurement reference plane, the distance between the second fixed terminal (2) and the fourth fixed terminal (4) is a fixed chord length parameter L, and the distance between the second fixed terminal (2) and the fourth fixed terminal (4) is a fixed chord length parameter L; the displacement sensor is centrally arranged at the geometric center position of the four fixed terminals, the detection direction faces the surface of the detected cylinder, and the surface distance of the workpiece is detected in real time; the processor is electrically connected with the touch display screen, the displacement sensor and the power supply module, the power supply module supplies power to the system, a diameter calculation module and a reference storage module based on a chord length parameter L are arranged in the processor, and an initial chord height reference parameter obtained by initialized calibration piece data can be stored; the diameter of the measured workpiece is automatically calculated and output by combining real-time data of the displacement sensor; the touch display screen integrates calibration parameter input, mode switching and data management functions.

Description

Technical Field

[0001] This utility model relates to the field of precision measuring instrument technology and is applicable to high-precision measurement of cylindrical workpieces. Specifically, through the coordinated layout of symmetrically distributed fixed terminals and displacement sensors, combined with the processor's built-in calculation module and reference storage module, it achieves rapid and automated diameter calculation and digital display, and completes reference calibration by initializing calibration data, effectively improving measurement accuracy and equipment operational reliability. Background Technology

[0002] In the field of machining, diameter measurement of cylindrical workpieces (such as shaft parts and pipes) is a core part of quality inspection. Traditional measuring tools such as vernier calipers and micrometers rely on manual operation, which is inefficient and prone to human error. Existing electronic measuring equipment (such as digital micrometers and laser diameter gauges) can achieve digital readings and have high accuracy, but they are complex in structure, expensive, and have cumbersome calibration procedures.

[0003] To address the aforementioned issues, existing technologies still lack an integrated digital measurement solution that is simple in structure, easy to calibrate, and capable of achieving high-precision diameter measurement. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: The digital diameter measuring instrument includes a housing, four fixed terminals symmetrically arranged at the bottom of the housing, the four fixed terminals are symmetrically distributed in a rectangle to form a measurement reference plane and constrain the position of the workpiece. The four fixed terminals include a first fixed terminal (1), a second fixed terminal (2), a third fixed terminal (3), and a fourth fixed terminal (4), wherein the vertex distance between the second fixed terminal (2) and the fourth fixed terminal (4) is a fixed design parameter L (i.e., chord length); the displacement sensor (6) is centrally arranged at the geometric center of the four fixed terminals, the detection direction is towards the surface of the cylinder being measured, and the distance from the workpiece surface to the sensor is detected in real time; the touch screen (5) integrates calibration parameter input, measurement mode switching and data management functions. A carrying handle (7) is provided on the top of the housing for easy instrument transport and on-site handheld operation.

[0005] The processor (9) is electrically connected to the touch screen (5), the displacement sensor (6) and the power module (8) respectively. The power module (8) supplies power to the system. The processor has a built-in diameter calculation module based on the fixed chord length parameter L and a reference storage module. The reference storage module can store the initial chord height reference parameter obtained from the initial calibration data. The diameter calculation module can combine the initial chord height reference parameter with the real-time displacement data of the displacement sensor to automatically output the measurement result of the diameter of the cylinder being measured.

[0006] In this invention, the initialization calibration component is a standard cylindrical structure with a known standard diameter, used to provide a calibration reference for the digital diameter measuring instrument. By inputting its known diameter data and in conjunction with the fixed chord length parameter L, the processor automatically calculates the initial chord height reference parameter to complete the instrument calibration and ensure measurement accuracy.

[0007] This utility model's digital diameter measuring instrument significantly improves measurement accuracy, operational efficiency, and environmental adaptability through innovative hardware layout, built-in calculation module, and reference storage module. Specific technical effects are as follows: the four fixed terminals are symmetrically distributed in a rectangle, physically constraining the position of the workpiece being measured and reducing measurement deviations caused by installation misalignment; a convenient calibration mode is adopted, requiring only the input of the known diameter data of the initial calibration piece, and the processor automatically completes the initial chord height reference parameter storage, greatly shortening calibration time; the touch screen integrates mode selection, parameter input, and data query functions, reducing human error; the device is equipped with a carrying handle for easy instrument transport and on-site operation; this utility model is applicable to workshop environments and batch testing scenarios, possessing excellent industrial practicality.

[0008] Furthermore, the displacement sensor can be a laser displacement sensor, a capacitive displacement sensor, or an inductive displacement sensor. Different types of sensors can be adapted to different measurement scenarios and accuracy requirements. Among them, laser displacement sensors are suitable for non-contact high-speed measurement, capacitive displacement sensors are suitable for high-precision small-range measurement, and inductive displacement sensors are suitable for industrial environments with strong interference.

[0009] Furthermore, the interactive interface of the touch screen includes a calibration mode, a measurement mode, and a historical data query mode: In the calibration mode, the known diameter data of the initial calibration piece is input, and the processor automatically completes the storage of the initial chord height reference parameters; in the measurement mode, the measurement result of the measured workpiece diameter is displayed in real time; in the historical data query mode, historical measurement data can be viewed, which is convenient for quality traceability. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of the digital diameter measuring instrument of this utility model;

[0011] Figure 2 This is a schematic diagram showing the mating state of the measuring instrument and the initialization calibration components;

[0012] Figure 3 This is a schematic diagram showing the mating state between the measuring instrument and the cylindrical workpiece being measured.

[0013] Explanation of reference numerals in the attached drawings: First fixed terminal (1), second fixed terminal (2), third fixed terminal (3), fourth fixed terminal (4); touch screen (5); displacement sensor (6); handle (7); power module (8); processor (9); initialization calibration piece (A); cylindrical workpiece under test (B). Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] like Figure 2 As shown, the digital diameter measuring instrument is placed on the initialization calibration piece (A), which is a standard cylinder with a known diameter D=100mm. The four fixed terminals, including the first fixed terminal (1), the second fixed terminal (2), the third fixed terminal (3), and the fourth fixed terminal (4), are symmetrically fixed to the bottom of the housing. The lower vertices are located on the same plane and the lines connecting adjacent vertices form a rectangle. The fixed distance between the vertices of the second fixed terminal (2) and the fourth fixed terminal (4) is 96mm (satisfying D>L, i.e., the fixed chord length parameter L=96mm). The known diameter 100mm of the initialization calibration piece (A) is input through the touch screen. The processor automatically calculates the initial chord height and stores it in the reference storage module according to the input initialization calibration piece data and the fixed chord length parameter L, thus completing the reference calibration of the digital diameter measuring instrument.

[0016] like Figure 3 As shown, the digital diameter measuring instrument is placed on the surface of the cylindrical workpiece (B) to be measured. The processor combines the real-time displacement data of the displacement sensor (6) and the initial chord height reference parameters in the reference storage module, and automatically calculates and displays the measured diameter on the touch screen (5) through the built-in diameter calculation module. The error is less than 0.1 mm, and the measurement work is completed.

[0017] In this embodiment, a laser displacement sensor is selected as the displacement sensor. It is centrally located at the geometric center of the four fixed terminals, and the detection direction is towards the surface of the cylindrical workpiece (B) being measured, so as to realize non-contact high-speed measurement.

Claims

1. A digital diameter measuring instrument, comprising a housing, four fixed terminals, a touch screen, a displacement sensor, a handle, a power module, and a processor, characterized in that: The four fixed terminals are symmetrically fixed to the bottom of the housing, with their lower vertices located on the same plane and adjacent vertices forming a rectangle. The four fixed terminals include a first fixed terminal (1), a second fixed terminal (2), a third fixed terminal (3), and a fourth fixed terminal (4), wherein the distance between the second fixed terminal (2) and the fourth fixed terminal (4) is the fixed chord length parameter L. The displacement sensor is centrally located at the geometric center of the four fixed terminals, with the detection direction facing the surface of the cylinder being measured. The processor is electrically connected to the touch screen, the displacement sensor and the power module respectively, and the power module supplies power to the touch screen, the displacement sensor and the processor. The processor has a built-in diameter calculation module and a reference storage module based on the chord length parameter L. The reference storage module is used to store the initial chord height reference parameter obtained from the initial calibration component data. The initial calibration component is a standard cylindrical structure with a known standard diameter, which is used to provide a calibration reference for the measuring instrument. The touch screen is used to input initial calibration data, switch working modes, and display diameter measurement results.

2. The digital diameter measuring instrument according to claim 1, characterized in that, The displacement sensor is a laser displacement sensor, a capacitive displacement sensor, or an inductive displacement sensor.

3. The digital diameter measuring instrument according to claim 1, characterized in that, The interactive interface of the touch screen includes calibration mode, measurement mode and historical data query mode. In calibration mode, it is used to input initial calibration data and realize function control through touch operation.

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