CN202057295U - Measuring device used in cylindricity error measuring method - Google Patents

Abstract

The utility model discloses a measuring device used in a cylindricity error measuring method, which comprises a base, a bolt, a spring clip, a measuring auxiliary external electrode, a measuring circuit, a measuring main external electrode, an internal electrode, a spring and an insulating gasket, Insulation layer, the inside of the base is hollow, the bolts pass through the bottom of the base, the bolts are sleeved with springs and then screwed to the bottom of the spring clamp, and the internal electrode is placed on the spring clamp, and the internal electrode is a standard cylinder body or a cylindrical workpiece to be measured, the measuring main external electrode and the measuring auxiliary external electrode are located on the outer periphery of the internal electrode, the measuring auxiliary external electrode spacer insulating gasket is set on the base, and the measuring main external electrode spacer insulating layer is set between the measuring auxiliary external electrodes On the other hand, the internal surface area of the main measuring external electrode is larger than that of the auxiliary measuring external electrode; the utility model has good temperature stability, simple structure, good dynamic response, high anti-interference performance, and is suitable for various working environments.

Description

Measuring device for measuring method of cylindricity error

technical field

The utility model relates to a measuring device used in a cylindricity error measuring method.

Background technique

Detection is the measurement to determine the value of the measured object. It is an indispensable and important task in various fields of industrial production, national defense construction, scientific research and daily life. The quality of detection not only affects the enterprise Economic benefits and the quality of people's living standards can even determine a country's status in the global industrial environment. The purpose of detection is mainly to obtain useful characterization and quantitative information of the measured object, and provide reliable basis for the entire production control process and process design process, such as the performance and status of the object.

Overview of current measurement methods for cylindricity:

The cylindricity error refers to the amount of variation between the actual measured cylindrical surface and its ideal cylindrical surface. The premise of error evaluation is the determination of the position of the ideal cylindrical surface. The selection of the ideal cylindrical surface should meet the minimum conditions, even if the actual measured elements are relatively ideal. The maximum variation is the minimum. The measurement methods of cylindricity error are generally divided into two categories: 1. The principle of ideal element comparison, using a roundness meter or a universal coordinate measuring machine, make the axis of the instrument coaxial with the axis of the measured part, and record the process of one revolution The radius difference of the measured points on the middle measurement section, this method conforms to the definition of cylindricity error, and is an ideal measurement method; 2. The characteristic parameter approximation method, using V-shaped block plates, coordinate indicators and other instruments, this The accuracy and measurement efficiency of this method are low, and there is the influence of measurement force, so it is an approximate measurement method.

In the 1950s, a three-coordinate measuring machine appeared abroad. This equipment has a wide range of applications. It can act on complex parts such as shaft parts, boxes, and planes, and can detect position, distance, size, angle, shape error, and position error. etc., with complete functions, it has always been known as a universal measuring machine. Three-coordinate measuring machines continue to develop and improve themselves, and are widely used and promoted in developed regions such as Europe and the United States. According to the statistics of three-coordinate measuring machines in the world in 1992, developed countries such as Europe and the United States own 85% of the total number of three-coordinate measuring machines in the world, which is The quality assurance of European and American machinery industry provides strong technical support.

At present, the application technology of digital image technology in geometric measurement has matured abroad. Companies such as Mahr in Germany, Tayler-Hobson in the United Kingdom, and OGP in the United States have all produced non-contact instruments with CCD measuring heads, and the serialization of products has been continuously upgraded. It satisfies the needs of detection technology very well. This method combines optical imaging technology and computer image processing technology to make the measurement accuracy reach a higher level. During the measurement, the measured object is used as a means or carrier for detection and transmission of information. The measuring head is actually a CCD camera. , the purpose of image processing is to extract useful signals from the image, analyze and obtain the expected lateral geometric parameters.

The first computer-controlled cylindricity measuring instrument in China was developed by the Beijing Institute of Mechanical and Electrical Engineering, and the cylindricity error can be evaluated by the least square method; the new five-coordinate rotating body measuring instrument was successfully developed by Dalian University of Technology, which can measure roundness, Contour, cylindricity, and contour errors of internal and external surfaces of rotary parts of composites; Northeastern University School of Mechanical Engineering independently developed the "XWY-1" type line error measuring instrument, which passed the appraisal of the State Bureau of Technical Supervision in December 1993.

Photoelectric plug gauge is a new type of special measuring instrument for aperture, which is mainly composed of plug gauge head, photoelectric sensor and digital display device. The reasonable application of photoelectric length measuring instrument is its success. Compared with traditional plug gauge It improves the measurement accuracy, efficiency and other functions. It can accurately measure the roundness, taper, and cylindricity of the test piece, and can also measure the bell mouth of the hole, local concave-convex inside the hole, sag, waist bulge, etc. There is also a new type of plug gauge that uses a fiber optic sensor, which uses a reflective modulated fiber optic sensor. The sensor is composed of a receiving fiber and a transmitting fiber. The principle of strong and corresponding changes is used to obtain the displacement of the object. The precision pneumatic measuring instruments of Edmond Company of the United States and TOSOK Company of Japan, and the digital pneumatic measuring instruments produced by Si Kebo in China, have a resolution of 0.1 μm. The digital pneumatic measuring instrument can realize the display of absolute value, the measurement result can be directly printed or stored in the computer, programmable and automatic.

At present, the research on CCD measurement technology in China is not complete; the photoelectric plug gauge has high requirements for the operating environment and is suitable for environments such as measurement rooms; Fast and accurate measurements for mass production of parts.

Utility model content

The purpose of the utility model is to provide a measuring device used in a cylindricity error measuring method.

Cylindricity error measurement methods are:

First put two standard cylinders with different diameters into the capacitive sensor, the capacitive sensor in the measurement circuit obtains the detected capacitance value from the two standard cylinders with different diameters, and the measured two capacitance values C _min and C _max , the range C of the capacitance value corresponding to the cylindricity tolerance of the measured cylindrical workpiece is: C _min ≤ C ≤ _{C max} ;

Then put the measured cylindrical workpiece into the capacitive sensor, the capacitive sensor in the measurement circuit obtains the detected capacitance value from the measured cylindrical workpiece, if the measured capacitance value C is in the range of C _min ≤ C ≤ _{C max} If the measured capacitance value C is not within the range of C _min ≤ C ≤ C _max , the cylindricity of the measured cylindrical workpiece is unqualified.

The utility model is a capacitive sensor. The structure of the capacitive sensor is composed of a base, a bolt, a spring chuck, a measuring auxiliary external electrode, a measuring circuit, a measuring main external electrode, an internal electrode, a spring, an insulating gasket, and an insulating layer. The inside of the base is hollow, the bolts pass through the bottom of the base, the bolts are sleeved with springs and then screwed to the bottom of the spring clamp, and the internal electrode is placed on the spring clamp, and the internal electrode is a standard cylinder or the measured Cylindrical workpiece, the measuring main external electrode and the measuring auxiliary external electrode are located on the outer periphery of the internal electrode, the measuring auxiliary external electrode spacer insulating gasket is set on the base, the measuring main external electrode spacer insulating layer is set on the measuring auxiliary external electrode, and the measuring circuit It is used to detect and measure the capacitance value between the main external electrode and the auxiliary external electrode and the internal electrode. The internal surface area of the main external electrode is larger than the internal surface area of the auxiliary external electrode. The capacitance value between the main external electrode and the internal electrode is C ₁ , measuring the capacitance value between the auxiliary external electrode and the internal electrode is C ₂ , measuring the capacitance value between the external electrode and the internal electrode is C=C ₁ -C ₂ , measuring the two electrodes of the main external electrode and the auxiliary external electrode The setting is to reduce the interference of the external environment on the measured value. The setting of the spring chuck and the bolt is to adjust the coaxiality between the inner electrode on the spring chuck and the main measuring external electrode and the measuring auxiliary external electrode.

The outer periphery of the base, the measuring main external electrode and the measuring auxiliary external electrode is provided with a shield sleeve.

The beneficial effects of the utility model are: the utility model has good temperature stability, simple structure, good dynamic response, high anti-interference performance, and is suitable for various working environments.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

Please refer to shown in Fig. 1, the utility model is capacitive sensor, and the structure of described capacitive sensor is by base 1, bolt 2, spring chuck 3, measuring auxiliary external electrode 4, measuring circuit 5, measuring main external electrode 6 , inner electrode 7, spring 8, insulating gasket 9, and insulating layer 10. The inside of the base 1 is hollow. The bolt 2 passes through the bottom of the base 1. The spring 8 is sleeved on the bolt 2 and then screwed to the spring chuck 3. The bottom of the spring chuck 3 is placed with an internal electrode 7, the internal electrode 7 is a standard cylinder or a cylindrical workpiece to be measured, and the main external electrode 6 and the auxiliary external electrode 4 are located on the periphery of the internal electrode 7 for measurement. The auxiliary external electrode 4 is arranged on the base 1 with the spacer insulating gasket 9, the measuring main external electrode 6 is provided with the insulating layer 10 on the measuring auxiliary external electrode 4, and the measuring circuit 5 is used to detect the measuring main external electrode 6 and the measuring auxiliary external electrode 4 and the capacitance value between the inner electrode 7, measure the inner surface area of the main outer electrode 6 is larger than the inner surface area of the auxiliary outer electrode 4, measure the capacitance value between the main outer electrode 6 and the inner electrode 7 is C ₁ , measure the auxiliary outer electrode The capacitance value between the electrode 4 and the internal electrode 7 is C ₂ , the capacitance value between the measurement external electrode and the internal electrode 7 is C=C ₁ -C ₂ , the measurement of the main external electrode 6 and the measurement auxiliary external electrode 4 two electrodes The setting is to reduce the interference of the external environment on the measured value. The setting of the spring chuck 3 and the bolt 2 is to adjust the coaxiality between the inner electrode 7 on the spring chuck 3 and the measuring main external electrode 6 and the measuring auxiliary external electrode 4 .

The outer periphery of the base 1 , the measuring main external electrode 6 and the measuring auxiliary external electrode 4 is provided with a shield sleeve 11 .

Claims (2)

1. A measuring device used in a cylindricity error measuring method is characterized in that: it is a capacitive sensor, which is composed of a base (1), a bolt (2), a spring chuck (3), and a measurement auxiliary external electrode (4) , measuring circuit (5), measuring main external electrode (6), internal electrode (7), spring (8), insulating gasket (9), and insulating layer (10), the base (1) is hollow inside, bolts (2) Pass through the bottom of the base (1), the bolt (2) is sleeved with a spring (8) and then screwed to the bottom of the spring clip (3), and the inner electrode (7) is placed on the spring clip (3) ), the internal electrode (7) is a standard cylinder or a cylindrical workpiece to be measured, the main external electrode (6) and the auxiliary external electrode (4) are located on the periphery of the internal electrode (7), and the auxiliary external electrode (4) is measured ( 4) The spacer insulating gasket (9) is set on the base (1), the main measuring external electrode (6) and the spacer insulating layer (10) are set on the measuring auxiliary external electrode (4), and the measuring circuit (5) is used to detect Measuring the capacitance value between the main external electrode (6) and measuring the auxiliary external electrode (4) and the internal electrode (7), the internal surface area of the measuring main external electrode (6) is greater than the internal surface area of the measuring auxiliary external electrode (4). 2. The measuring device used in a method of measuring cylindricity error according to claim 1, characterized in that: the base (1), the outer peripheral cover of the main measuring external electrode (6) and the measuring auxiliary external electrode (4) A shield sleeve (11) is provided.

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