SU731273A1 - Apparatus for measuring article dimensions - Google Patents

Description

The invention relates to mechanical engineering, in particular to the field of measuring the dimensions of products. A device for measuring product dimensions is known, based on a two-contact measurement method. It contains transducers of the position of the product edge (vibrating or pneumatic), the mechanism for their installation and the measuring unit. The installation mechanism of the transducers is made in the form of a rack along which two carriages carrying transducers move. The measuring unit is designed to process information from the transducers and display the measurement result. The initial initial setup of the device is done by the installation measure or a test run. The transition from one adjustment size to another is carried out manually using a limb or a stepper motor 1. However, this device does not provide high accuracy of measurement, which is due to the use of an analog method of information processing, as well as the need for the operator to calculate the measurement result by the installation size installation and limbo. It is also known a device comprising two television systems, two reversible counters and intermediate registers, an adder, a comparison unit, a size setter and an indicator. Television systems are used as transducers for positioning the edge of the product. The following system consists of a drive (motor and gearbox), a lead screw, a travel screw displacement transducer. Measurement of the size of the product is carried out in the process of tracking the edge of the product using television and tracking systems. Information on the movement of television systems from transducers of movement of the drive screws goes to reversible counters, from which via intermediate registers goes to the adder, and then to the indicator and the comparison unit. The second input of this block from the unit size comes the value of the nominal size. The light board signals the equality of the measured and nominal size 1.

The closest in technical essence. The invention is a device for measuring the dimensions of products, comprising a driven screw with a drive, a moving screw displacement transducer, an article edge position transducer mounted on the propeller, a feedback unit, the input of which is connected to the output of the edge transducer the control unit connected to the feedback unit and the drive, a counter whose input is connected to the output of the travel screw displacement transducer, an adder, the first signal input to torogo connected to the counter output, and an indicator coupled to the output of the adder 2.

A disadvantage of this device is low measurement accuracy.

The purpose of the invention is to increase the measurement dimension.

This goal is achieved by the fact that the transducer of the position of the edge of the product is designed as a gap sensor and connected to the second signal input of the adder, and the control one, the input of the adder is connected to the output of the control unit.

The drawing shows a block diagram of the device.

. The device for measuring the dimensions of products contains an actuator 1 with a lead screw 2, a feedback unit 3, a displacement converter 4 of the lead screw 2, a product edge position converter 5, a control block 6, a counter 7, an adder 8 and an indicator 9. The actuator 1 through the lead screw 2 is connected to converters 4 and 5.

The output of converter 4 is connected to the input of counter 7, the output of which is connected to the first signal input of the adder 8. The output of converter 5 is connected to the input of the feedback unit 3 and the second signal-input of the adder 8. The control block 6 is connected to feedback block 3 and drive 1. The control input of the adder 8 is connected to the output of the control block b, and the output is connected to the indicator 9.

A device for measuring the dimensions of products works as follows:

In the initial position, the converter 5 is retracted from the product,. With the start-up of the device, the control unit 6 is transferred to the preparatory mode. In this mode, the block is synchronized with the time stamps of the crystal oscillator (not shown). After synchronization, the block is switched to the mode designed to check the position of the transmitter 5 relative to the measured item. This check is implemented by

is via the feedback unit 3 as follows.

The control unit 6 sequentially generates a reset pulse for the counter of the feedback unit 3 and a pulse of the reference duration opening the input of this counter. These pulses grow into feedback block 3. The signal input of this block receives pulses of -c converter 5. At the same time, the counter of the Q 3 block is filled before reaching the state corresponding to the specified gap between the converter 5 and and the product.

In the process of moving converter 5 in the direction of the product, the above test is repeated. If the transducer 5 is outside the measurement zone, then the control unit 6 is automatically transferred to

20 is a mode for supplying converter 5 to the measurement zone. In this mode, the control unit 6 turns on the drive 1. At the same time, pulses start to come from the converter 4 to the input of the counter 7. Counter 7 subtracts from the start code the unitary code coming from converter 4 during rotation of lead screw 2, and the position of converter 5 constantly repeats. At the input of converter 5 to the measurement zone, the control unit is switched to the after-run coasting end 1 running out from: the output of the control unit 6 to the control input of the adder 8 enters the co-gand for transferring the counter code 7 to the adder 8. After this transfer, the control unit b is transferred to the measurement mode 11 of the gap. Block b

The control generates a pulse of the reference duration, which arrives at the control of the input of the adder 8. As a result, the number of pulses that have arrived at the second signal ;. the input of the adder 8, in proportion

the size of the gap.

The termination of the measurement process and the return of the transducer 5 to the initial position are carried out by the control elements of the drive 1. The measurement result is displayed, continuously.

Claims (2)

Invention Formula A device for measuring the dimensions of products, comprising a lead screw with a drive, a screw drive displacement transducer, an article edge position transducer, O mounted on the spindle screw, a feedback unit whose input is connected to the output of the product edge position transducer, a control block connected to the block, inverse communication and drive, counter, input which is connected with the output of the travel screw displacement transducer, the adder, the first signal input of which is connected to the counter output, and the indicator connected to the output of the adder, is different if, in order to improve the measurement accuracy, the transducer of the product edge is made gap sensor and connected to. the second signal input of the adder, and the control input of the adder is connected to the output of the control unit. Sources of information taken into account in the examination 1, Proceedings of the Leningrad Polytechnic Institute 1 321, L., Mechanical Engineering, 1972, p. 206-211. 2. Vorontsov L.N. Photovoltaic. kie systeg l control linear led. M., Mechanical Engineering 1965, p. 210-212 (prototype).