Diameter measuring instrument with V-shaped guide jig

Abstract

The utility model relates to the technical field of diameter measuring instruments, and discloses a diameter measuring instrument with a V-shaped guide jig. The utility model aims to solve the technical problems that in the prior art, in the measurement process of cylindrical workpieces and the like in the medical industry, a traditional diameter measuring instrument lacks a guide jig, cannot adapt to workpieces to be measured of different sizes and shapes, is difficult to measure the bottom positions of the workpieces, is prone to errors and has laser signal interference, and consequently the measurement precision is affected. The device comprises two diameter measuring instruments which are arranged in a rhombus shape and comprise a receiver and an emitter, a measuring area is defined between the two diameter measuring instruments, a V-shaped guide jig is arranged in the measuring area, the device comprises a supporting rod, a V-shaped block is installed on the supporting rod, a V-shaped groove is formed above the V-shaped block, and a groove is formed in the middle of the V-shaped block. According to the utility model, a guiding tool is introduced, the tool is suitable for measuring cylindrical workpieces, and the measuring precision is improved.

Description

Technical Field

[0001] This utility model relates to the field of diameter measuring instrument technology, and in particular to a diameter measuring instrument with a V-shaped guide fixture. Background Technology

[0002] With the rapid advancement of technology, the precision of machining is increasing, which in turn places higher demands on the accuracy of mechanical parts inspection. During production, due to the complexity of parts and the real-time nature of measurement, traditional measurement methods cannot meet the requirements for part dimensional inspection. Laser diameter measurement technology, a dynamic online measurement technology that emerged in the 1970s, has gradually matured with the rapid development of optoelectronics. Common laser diameter measuring instruments include laser Doppler diameter measuring instruments, laser diffraction diameter measuring instruments, laser scanning diameter measuring instruments, and projection imaging diameter measuring instruments. Laser scanning diameter measurement is a commonly used method for measuring diameter. A laser beam is shaped by a focusing and collimating system and then shines onto a scanning prism. The scanning prism is driven by a synchronous motor to rotate at a constant angular velocity, forming a scanning beam. After passing through a lens, the scanning beam forms a uniform, parallel-axis scanning beam that sweeps across the workpiece under test. The beam is then focused by a photodetector, which converts the optical signal into an electrical signal, generating a time-varying photoelectric signal output. A low level is generated when the scanning beam is blocked by the workpiece under test, and a high level is generated when the scanning beam is not blocked. Therefore, by measuring the time of light obstruction and the rotation speed of the prism, the diameter of the workpiece can be determined.

[0003] Chinese patent document 202310525872.9 discloses a diameter measuring instrument. The diameter measuring instrument includes a limiting mechanism, a measuring mechanism, and a control mechanism. Both the limiting mechanism and the measuring mechanism have through holes, allowing them to be fitted around the workpiece to measure its diameter. The control mechanism includes a central processing unit and an alarm module, with the central processing unit connected to the limiting mechanism, the measuring mechanism, and the alarm module.

[0004] However, the above-mentioned solutions have at least the following technical problems during implementation: In the measurement of cylindrical workpieces in the medical industry, traditional diameter gauges lack guiding fixtures, cannot adapt to workpieces of different sizes and shapes, and are difficult to measure the bottom position of the workpiece, which easily leads to errors. Furthermore, laser signal interference affects measurement accuracy. Therefore, there is an urgent need to propose a diameter gauge with a V-shaped guiding fixture. Summary of the Invention

[0005] In view of the above technical problems, this disclosure provides a diameter measuring instrument with a V-shaped guide fixture, which solves the technical problems in the prior art of measuring cylindrical and other workpieces in the medical industry. Traditional diameter measuring instruments lack guide fixtures, cannot adapt to workpieces of different sizes and shapes, are difficult to measure the bottom position of the workpiece, are prone to errors, and are subject to laser signal interference, which affects the measurement accuracy.

[0006] According to one aspect of this disclosure, a diameter measuring instrument with a V-shaped guide fixture is provided, comprising at least two diameter measuring instruments mounted on a base. The diameter measuring instruments are arranged in a rhombus shape and include receivers located on the upper sides of the rhombus and transmitters located on the lower sides of the rhombus. A measuring area is formed in the middle, and a V-shaped guide fixture is provided within the measuring area. The V-shaped guide fixture includes support rods located on both sides of the diameter measuring instrument. V-shaped blocks are mounted on the support rods. A V-shaped groove is provided above the V-shaped blocks to support the workpiece to be measured. A groove is formed in the middle of the V-shaped blocks corresponding to the laser scanning point of the diameter measuring instrument to form a laser channel.

[0007] In some embodiments of this disclosure, the opening angle of the V-groove ranges from 60° to 120°.

[0008] In some embodiments of this disclosure, the groove width is greater than 1.2 times the diameter of the laser beam.

[0009] In some embodiments of this disclosure, the support rod includes a height adjustment structure, which includes a motor connected to a lead screw, ball bearings mounted on the lead screw, and the ball bearings connected to a V-block to adjust the height position of the V-shaped guide fixture.

[0010] In some embodiments of this disclosure, a pressure sensor is provided at the bottom of the V-groove, the sensing signal of the pressure sensor is connected to a control box, the control box is connected to a diameter measuring instrument, and a display screen is provided on the upper surface of the control box to display measurement data.

[0011] In some embodiments of this disclosure, the surface of the V-groove is provided with an anti-wear coating.

[0012] In some embodiments of this disclosure, the wear-resistant coating is Teflon.

[0013] The beneficial effects of this utility model are as follows:

[0014] The Teflon anti-wear coating on the V-groove surface provides excellent wear resistance, significantly extending the service life of the V-shaped guide fixture. This reduces measurement errors caused by wear, lowering the frequency of equipment maintenance and replacement. The diamond-shaped diameter gauge design ensures precise alignment of the laser scanning point, improving measurement accuracy. The V-groove opening angle ranges from 60° to 120°, accommodating workpieces of different sizes and ensuring stable placement during measurement. The groove width is greater than 1.2 times the laser beam diameter, ensuring smooth laser beam passage and avoiding signal interference. The height adjustment structure of the support rod allows the V-shaped guide fixture to be precisely adjusted according to the workpiece height, accommodating workpieces of varying heights. This enhances the versatility and flexibility of the device, making it suitable for various industrial inspection scenarios. A pressure sensor at the bottom of the V-groove monitors the contact pressure between the workpiece and the V-groove in real time, ensuring workpiece stability and measurement data accuracy during measurement. A display screen on the upper surface of the control box shows the measurement data in real time, facilitating quick acquisition and recording of measurement results by operators. This improves operational convenience and data management efficiency. The Teflon anti-wear coating is not only wear-resistant but also has excellent corrosion resistance, making it suitable for industrial environments with dust, oil, and other contaminants. The low coefficient of friction reduces the sliding resistance of the workpiece within the V-groove, improving measurement stability and repeatability. This device can be integrated with automated production lines, communicating with external control systems via a control box to achieve automated measurement and data recording. This improves production efficiency, reduces manual intervention, and minimizes human error. Attached Figure Description

[0015] Figure 1 A schematic diagram of a diameter measuring instrument with a V-shaped guide fixture;

[0016] Figure 2 This is a schematic diagram of a diameter measuring instrument with a V-shaped guide fixture from another perspective.

[0017] Figure 3 A schematic diagram of the diameter measuring instrument with a V-shaped guide fixture from another perspective;

[0018] The components in the diagram are named as follows: 1. Base; 2. Diameter gauge; 3. Receiver; 4. Transmitter; 5. Measuring area; 6. V-shaped guide fixture; 7. Support rod; 8. V-block; 9. V-groove; 10. Groove; 11. Motor; 12. Lead screw; 13. Ball bearing; 14. Control box; 15. Display screen. Detailed Implementation

[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention. Example 1

[0020] This example discloses a diameter measuring instrument with a V-shaped guide fixture; see [link to documentation]. Figures 1 to 3 The device includes two diameter measuring instruments 2 mounted on a base 1. The diameter measuring instruments 2 are arranged in a rhombus shape and include receivers 3 located on the upper sides of the rhombus and transmitters 4 located on the lower sides of the rhombus. A measuring area 5 is formed in the middle. A V-shaped guide fixture 6 is provided in the measuring area 5. The V-shaped guide fixture 6 includes support rods 7 located on both sides of the diameter measuring instruments. V-shaped blocks 8 are installed on the support rods 7. A V-shaped groove 9 is provided above the V-shaped blocks 8 to support the workpiece to be measured. A groove 10 is opened in the middle of the V-shaped blocks 8 corresponding to the laser scanning point of the diameter measuring instrument to form a laser channel.

[0021] The opening angle of the V-groove 9 ranges from 60° to 120°.

[0022] The width of groove 10 is greater than 1.2 times the diameter of the laser beam.

[0023] The support rod 7 includes a height adjustment structure, which includes a motor 11. The motor 11 is connected to a lead screw 12. A ball bearing 13 is mounted on the lead screw 12. The ball bearing 13 is connected to a V-block 8 to adjust the height position of the V-shaped guide fixture 6.

[0024] A pressure sensor is installed at the bottom of the V-groove 9. The sensing signal of the pressure sensor is connected to the control box 14. The control box 14 is connected to the diameter measuring instrument 2. A display screen 15 is installed on the upper surface of the control box 14 to display the measurement data.

[0025] The surface of the V-groove 9 is coated with an anti-wear layer.

[0026] The wear-resistant coating is made of Teflon.

[0027] During operation, the workpiece to be measured is placed in the V-groove of the V-shaped guide fixture, ensuring its stable placement. The surface of the V-groove is plated with a chromium layer and a composite tungsten carbide coating, providing high wear resistance and corrosion resistance, ensuring the workpiece does not wear during placement and measurement. Based on the workpiece height, a motor-driven lead screw rotates, and the ball bearings on the lead screw move the V-block up and down, thereby adjusting the height of the V-shaped guide fixture. This ensures the laser scanning point is aligned with the workpiece's measurement position. After the pressure sensor at the bottom of the V-groove senses the workpiece, the transmitter of the diameter gauge emits a laser beam, which passes through the groove in the middle of the V-block and illuminates the workpiece surface. The reflected laser beam is received by the receiver, which converts the optical signal into an electrical signal. The control box processes the electrical signal, calculates the workpiece's diameter and roundness dimensions, and displays the measurement results on the screen. The Teflon anti-wear coating on the V-groove surface not only provides high wear resistance but also excellent corrosion resistance, adapting to dusty and oily conditions in industrial environments. The low coefficient of friction of the coating reduces the sliding resistance of the workpiece in the V-groove, improving the stability and repeatability of the measurement.

[0028] Although some preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0029] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A caliper with a V-shaped guide jig, characterized by: The device includes at least two diameter measuring instruments mounted on a base. The diameter measuring instruments are arranged in a rhombus shape and include receivers located on the upper two sides of the rhombus and transmitters located on the lower two sides of the rhombus. A measuring area is formed in the middle of the rhombus. A V-shaped guide fixture is provided in the measuring area. The V-shaped guide fixture includes support rods located on both sides of the diameter measuring instrument. V-shaped blocks are installed on the support rods. A V-shaped groove is provided on the upper part of the V-shaped block to support the workpiece to be measured. A groove is opened in the middle of the V-shaped block corresponding to the laser scanning point of the diameter measuring instrument to form a laser channel.

2. The diameter measuring instrument with V-shaped guiding fixture according to claim 1, characterized in that: The opening angle of the V-groove is in the range of 60° to 120°.

3. The diameter measuring instrument with V-shaped guiding fixture according to claim 1, characterized in that: The width of the groove is greater than 1.2 times the diameter of the laser beam.

4. The diameter measuring instrument with V-shaped guiding fixture according to claim 1, characterized in that: The support rod includes a height adjustment structure, which includes a motor connected to a lead screw, ball bearings mounted on the lead screw, and the ball bearings connected to a V-block to adjust the height position of the V-shaped guide fixture.

5. The diameter measuring instrument with V-shaped guiding fixture according to claim 1, characterized in that: A pressure sensor is installed at the bottom of the V-groove. The sensor's signal is connected to a control box, which is connected to a diameter measuring instrument. A display screen is installed on the upper surface of the control box to display measurement data.

6. The diameter measuring instrument with V-shaped guiding fixture according to claim 1, characterized in that: The surface of the V-groove is provided with an anti-wear coating.

7. The dial gauge with V-shaped guide jigs according to claim 6, wherein: The wear-resistant coating is made of Teflon.

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