RU141805U1 - DETAIL SIZE MEASUREMENT DEVICE - Google Patents

Abstract

A device for measuring the size of a part containing a jet generator, an indicator of the frequency of electrical signals and a measuring nozzle, characterized in that the jet generator is made in the form of a jet analog element, the measuring circuit of which is highlighted by a receiving channel on the path of the generator’s power supply, located as a midpoint between two differential pressure receivers, and which is connected to an electric pneumatic pressure frequency sensor and a measuring nozzle, and the bypass is made drain channels jet generator.

Description

The utility model relates to measuring technique and can be used to measure a wide range of external and internal dimensions of parts and assemblies where high measurement accuracy is required, for example, for parts of various shapes in the engineering industry.

Known are devices for measuring the linear size of a part with indication of measurement on an electronic scoreboard, for example, an active control device for internal grinding machines BV-4307 of the company NIImeasurement OJSC or an analogue of the Univar device of Marposs company (Italy), which has a complex conversion of mechanical value into electronic with an output to the screen, a limited measurement range from 10 to 200 mm and the price of division of a scale of 1 and 10 microns (www.micron.ru).

The well-known long-distance meter Aerotest-R (V.M. Murashov. Pneumatic high-pressure long-length meter of rotametric type Aerotest-R // Sensors and systems. No. 12-2005) has the following disadvantages: the need to maintain the vertical axis of the rotameter tube in angular limits to maintain the specified measurement accuracy ; measurement accuracy is not better than 0.5-2.5%; large dimensions up to 0.5 m and weight up to 5 kg; strict adherence to the size of the conicity of the rotameter tube, for example 1: 1000, obtained as a result of many years of development of glass casting technology in its manufacture; the need to maintain the device in a sterile state, which is complicated by large dimensions.

The closest technical solution adopted for the prototype is the Part size measuring device (RU 2397441 C1, 08.20.2010) contains a pneumatic tolerance meter in the form of a jet generator with a bypass and a measuring nozzle.

The disadvantages of the known device are a separately formed bypass indicator with a throttle located in it, connected by an input to the pressure line, by exits to the discharge throttle to the atmosphere, significantly increases the dimensions of the device, and a small frequency measurement range.

The technical result is to increase the frequency and range of the output signal, reducing the dimensions of the device.

The technical result is achieved by the fact that the device for measuring the size of the part contains a jet generator, an indicator of the frequency of electrical signals and a measuring nozzle, in which the jet generator is made in the form of a jet analog element, the measuring circuit of which is highlighted by the receiving channel on the path of the generator’s power supply, located as an average point between two differential pressure receivers, and which is connected to an electric pneumatic pressure frequency sensor and measuring nozzles ohm, and the bypass is made by the drain channels of the jet generator.

The proposed device has the following advantages:

- the frequency of the useful signal is higher due to the doubling of the frequency in the receiving channel when switching the power supply between two differential pressure receivers included in the feedback line.

- lack of additional external communication channels, as the bypass is organized internally through the available atmospheric drain channels of the inkjet element, everything is formed on one plate. No adjustment throttle.

The drawing shows the claimed device. The proposed device contains a pneumatic jet generator 1 with a bypass 2 and a measuring nozzle 3, the jet generator 1 is made in the form of an analog analog element 4, the measuring circuit of which is allocated by the receiving channel 5 on the path of the distribution of the jet 6 of the power supply 7 of the generator 4, located as the midpoint between the two differential pressure receivers 8, 9, and which is connected to the sensor and the measuring nozzle 3, bypass 2 is made by drain channels 10, 11 and 12, 13, feedback channels 14, 15 of the jet generator 1, 16 are controlled Single item with size L and a tolerance, e.g., L passing _straight through passage and _indirect L, 17- elektrokanal transfer pressure signal, 18 - electric sensor frequency pneumatic pressure, 19 - light frequency electrical signals.

The principle of operation of the device is based on a change in the flow rate of air passing through the measuring gap L between the measuring nozzle and the surface of the controlled part. When the controlled size is changed, the size of the measuring gap L and the air flow through it changes, which causes a change in the frequency _{fG of the} output signal of the jet generator 1.

For example, reducing the size L (approaching part 16 to the measuring nozzle 3) leads to a decrease in flow rate through the receiving channel 5, an increase in the pressure difference between the inlet to channel 5 (conditionally constant throttle) and its output to the part 16 (variable throttle), and a decrease in the frequency of the output signal. Not consumed part of the flow by the receiving channel 5 passes into the drain channels 2 of the jet generator 1.

The jet generator has the property of increasing the frequency of oscillations of the pressure signals with increasing air flow, which allows, increasing the pressure or air flow in the power line of the jet generator, to increase the frequency f _SG and, therefore, the number of pulses N by 1 division of the measured size, for example, N / mm or N / μm. An increased frequency value corresponds to lower linear values of the size or tolerance of the part being monitored. Thus, the price of dividing the frequency signal decreases and the accuracy of reading the size of the controlled part increases. In the process, with an increase in the measuring gap L, the frequency f of the _{SG of the} output signal of the generator 1 increases.

The device operates as follows. Air from the pneumatic network through the stabilized power line enters the power supply channel 7 of the jet generator, formed in the form of a jet 6 enters the interaction chamber of the jet generator 1 and passes through the discharge chamber 2 (10, 11 and 12, 13) into the atmosphere. The generation mode is provided by receiving channels 8 and 9, feedback channels 14, 15, through which pressure signals enter the control channels of the jet analog element 4. At the same time, air passes to channel 8, sensor 18 and to the measuring nozzle 3 and enters the atmosphere through the measuring gap L. When the indicator 19 is connected through the sensor 18 to the jet generator 1 detects pnevmoimpulsov frequency f ₀ of the jet generator, defining air flow for the nominal size L controlled piece 16. in operation, the jet gene Rathore 1 jet supply 6 is switched between the differential receiving channels 8 and 9 and on the way the switching in the receiving channel 5 are generated pressure signals twice the frequency f ₀ as compared with the frequency f _SH jet generator 1 in the channels 14, 15 feedback.

When configuring the measurement deviation boundaries nominal dimension L ₀ as deviations (L passing _straight through passage L and _indirect) and the tolerance on the drawing boundary fixed frequency f _min and f _max a precision device (e.g., polished sized tiles). When changing the size L _direct > L ₁ > L _{0 of the} controlled part 16, the flow rate of air flowing through the measuring gap L ₁ and the jet generator 1 changes, and as a result, a different (higher) output frequency f _x = f ₁ other than the frequency f ₀ , which corresponds to the nominal (zero) tolerance size, i.e. f ₀ <f ₁ . If the output frequency f _x is within the deviation of the frequencies f _min and f _max , then, therefore, the controlled size L is within the tolerance, and the measurement result of which is marked by the factory quality control, as the size corresponding to the requirement of technical documentation.

Using the mechanical movement of the nozzle 3, as well as the pressure (flow) in line 7, the sensitivity and position “0” on the scale of the output signal are adjusted according to the frequency f ₀ . Reducing the gap L increases the air flow through the channels 2 of the jet generator 1 parallel to the flow rate through the measuring nozzle 3. As a result, the measurement sensitivity on the indicator 19 decreases and the frequency values f _min and f _max corresponding to the tolerance limits (lower and upper) approach each other, i.e. . the number of pulses decreases (frequency difference f _max -f _min ) between them.

Thus, such advantages of the proposed device, built in a parallel circuit, as the doubled frequency of the output pneumatic signal, the bypass is organized inside the flat configuration of the jet element,

Claims (1)

A device for measuring the size of a part containing a jet generator, an indicator of the frequency of electrical signals and a measuring nozzle, characterized in that the jet generator is made in the form of a jet analog element, the measuring circuit of which is highlighted by a receiving channel on the path of the generator’s power supply, located as a midpoint between two differential pressure receivers, and which is connected to an electric pneumatic pressure frequency sensor and a measuring nozzle, and the bypass is made drain channels jet generator.

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