SU1060946A1 - Pneumatic single-limit device for checking linear dimensions - Google Patents

Abstract

PNEUMATIC ODNOPREDELNOE DEVICE FOR CONTROL LINEYNSH size, comprising two stabilizer pressure, two comparing element sensor type nozzle-flap and throttle setpoint pressure inputs krtoryh communicated with one of the pressure regulators, and outputs - a correcting yuschimi chambers comparing element operating in the regime amplifier, and pneumoelectric transducer, the input of which communicates with the nozzle chambers of another comparison element operating in the relay mode, the nozzle of which communicates with another rum pressure, ie about whether chayuschees in that in order to precisely control povvleni controlling guides Ks1Mery sopLs1mi relay communication with the amplifier, and through the throttles - another pressure regulator. n | ё

Description

About About 4

o :) The invention relates to a measurement technique and can be used for single-limit control of linear dimensions. A single-limiting pneumatic device is known for controlling linear dimensions, which contains two pressure stabilizers, two comparison elements, a nozzle-damper type sensing element and a throttle for a pressure sensor, whose inputs are connected to one of the pressure stabilizers, and the comparison element control chambers, operating in amplifier mode, and pneumoelectric transducer, whose input is connected with nozzle chambers, operating in the relay mode of another comparison element, the nozzle of which is in communication with another station a pressure booster, and a diaphragm setting device, the output of which is communicated with one of the control cameras of the relay, and the other control unit of the X1 measure of the relay communicates with the output of the amplifier 1 However, the known device does not provide the necessary accuracy of control due to the influence of the supply pressure stability on the control signal. coming from the amplifier into the control chamber of the relay. “The purpose of the invention is to improve the accuracy of the control. The goal is achieved by the fact that in a pneumatic single-limiting device for controlling linear dimensions, co; holding two stabilizers. two pressure elements, a nozzle-flap sensitive element and a pressure throttle unit, the inputs of which are connected to the pressure stabilizers, and the outputs from the control to the Dimi cameras of the comparison element operating in the amplifier mode, and the pneumoelectric transducer, the input which communicates with the nozzle chambers of another relay element operating in the relay mode, the nozzle of which is in communication with another pressure stabilizer, the control chambers of the relay communicate with the nozzles of the amplifier, and through ..; chokes with another pressure stabilizer. FIG. 1 shows a schematic diagram of the device} in FIG. 2 - graphs of control signals at the input and at the output of the relay, depending on the measurement gap. The pneumatic single-limiting device for controlling linear dimensions contains a nozzle-flap type sensitive element 1, two pressure regulators 2 and 3, two comparison elements 4 5, pressure throttle unit 6, pneumatic converter 7 and constant throttles 8 and 9. Comparison element 4 in amplifier mode, comparison element 5 in relay mode. The flow sections of chokes 8 and 9 are equal to each other. The inputs of the sensing element 1 and the throttle setting device b are in communication with the stabilizer 2, and their outputs are connected with the controllers KcUvjepaMH of element 4 right. The input of the electric motor 7 communicates with the nozzle chambers of the comparison element 5. The output of the stabilizer 3 communicates with the nozzle of the comparison element 5 and through the throttles 8 and 9 with the nozzles of the comparison element 4. The nozzles of the comparison element 4 are also in communication with the control chambers of the comparison element 5. In the nozzles of the element 4. Comparison signals are formed with pressures PI and P, and at the output of Comparison element 5, a RE signal. The device operates as follows. Depending on the part size being monitored, the gap h between the end of the nozzle of the sensing element .1 and the surface of the test part 10 changes. The change in the gap h translates into a change in measurement pressure that flows into the control chamber of the comparison element 4. The second control chamber of the comparison element 4 is supplied with pressure from the throttle setting device 6, which the device adjusts to the required response level corresponding to the size limit of the part 10. A change in the measuring pressure causes the membrane unit of the comparison element 4 to move towards the chamber with a lower pressure, this one of its nozzle is opened, and the other is covered, as a result of which the pressure P | and r. As the gap h decreases, the measuring pressure increases, the membrane unit shifts to the right, the pressure Pf drops, and the pressure P2 increases, as shown in .2 a, b. Since the flow sections of the throttles 8 and 9 are equal to each other, and the nozzles of the comparison element 4 are identical, the pressure increment P is equal to the decrease in pressure P, the comparison element 4 significantly increases the pressure variation in the measuring pressure, which reduces the effect of the supply pressure fluctuations a stabilizer on the response pressure of the reference element 5. Comparison element 5 converts an analog signal in the form of a pressure difference P and P2 into a discrete signal P about achieving a controlled size of a given value, which is converted into an electrical signal by means of a pneumatic converter 7.

. Thus, the connection of the control chambers of the relay comparison element to the amplifier nozzles and through the chokes. to the pressure stabilizer provides an increase in the gain factor, reduces the control pressure values at the moment of switching the relay, and thus improves the accuracy of control of linear dimensions.

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Claims (1)

PNEUMATIC ONE-LIMIT DEVICE FOR MONITORING LINEAR DIMENSIONS, containing two pressure stabilizers, two elements for comparing the nozzle-throttle and a throttle pressure regulator, the inputs of which are communicated by the frame, to the transformer, Dimensional control devices common with nozzle chambers operating in the relay mode of another comparison element, the nozzle of which is communicated with another pressure stabilizer, characterized in that, in order to increase the accuracy of control, the control chambers of the relay are communicated with the amplifier llamas, and through throttles one of stabilizers pressure exits - with controllers of the comparison cell, operating mode amplifiers the pneumatic inlet of which is pressure · s, the inputs of which are separate from the stabilizers of the outlet pressure - with controllers of the comparison element, pa otayusche20