SU387759A1 - DEVICE MEASUREMENT POSITION MECHANISM - Google Patents

Description

one

Devices are known for measuring the position of a mechanism, for example swath mill rolls, including accumulation sensors consisting of a disk, a sensing element, a recording rotation of a disk, a reversible pulse counter coming from a sensing element, and a unit for generating signals of the direction of movement of the mechanism.

However, in those cases when it is practically impossible to locate a disk directly on a controlled axis, in known devices it is impossible to obtain an accuracy of measuring the position of the mechanism above the magnitude of the mechanical backlash in the gearboxes.

. The proposed device differs from the known ones in that it is provided with a logic circuit consisting of an information recording unit, an error counter, an analysis unit to zero, and a coincidence circuit. In this case, the directional signal generation unit is connected to the information input unit, the counting pulse generation unit is associated with the coincidence circuit, and the output of the analysis unit to zero is connected with the input coincidence circuit of the reversible counter.

This makes it possible to eliminate the error arising due to mechanical play between the

do controlled axis and the axis on which the disk is fixed.

The drawing shows a block diagram of the proposed device.

The counting pulses are formed by means of a disk / mounted on the axis of the electric motor 2, the sensitive element 3 and the block 4 of the formation of the counting pulses. The working mechanism 5 is connected to the electric motor through a gearbox 6 with backlash. The pulses from block 4 enter the reversible counter 7 through the logic circuit 8, coincidence, and the signal that permits the passage of pulses to the reversible counter,

comes from a logic circuit, the elements of which are circled by a dotted line in the drawing. The inputs of this logic circuit are connected to a block of the formation of counting pulses and a block 9 of generating a directional signal

electric motor 2 (at the signal of the tachogenerator). The logic circuit consists of a coincidence circuit 10, a block // entering information, an error counter 12 and an analysis block 13 to zero.

Block 9 provides an alternately high level to one of the inputs in accordance with the polarity of the input signal, depending on the direction of rotation of the engine. The information // block is used to write to

a counter 12 of a known mechanical backlash value at the time or before the mechanism starts moving and to prohibit the re-recording of information in the counter 12 if the backlash would be selected before stopping (at the previous movement). This block contains a static dial pad, the information from which the backlash (pre-dialed) is output to the trigger of the error counter 12 in accordance with the specified logic upon a signal about a change in the direction of movement of the axis of the electric motor. An error counter 12, made on static triggers, the counting input of which is connected to the output of the coincidence circuit 10, serves to subtract the contents recorded by the signal of block 11 at the beginning of the movement of the mechanism.

The zero analysis unit 13 when the information of the counter 12 is zeroed by one output blocks the coincidence circuit 10, and the other output permits the passage of pulses through the coincidence circuit 8 and, therefore, their counting in the reversing counter 7. In addition, the first output of the block 13 allows using additionally introduced into the block / Inventor and two coincidence circuits, block the recording of information into the counter 12, if the mechanism, which practically does not happen, stopped with an incompletely selected backlash. Reversible counter 7 contains information about the position of the mechanism.

In order to improve the noise immunity of the device, a limit switch 14 is introduced into it, with which the counter 7 is reset when the zero position mechanism is in progress, and the block 15 is about issuing information at the moment the counter is recalculated ..

The device works as follows.

The mechanism is at zero point. At the occurrence, at the output of the signal block 9, the information on the value of

backlash. Since in this case, the first output of the unit 13 is high, and the second is low, the pulses of the unit 7 can pass only through the circuit 10 of coincidence. 5 When pulses are received from block 4, in the counter 12, the information is subtracted and when it goes to zero, the first output of block 13 appears low and the second, high.

0 Thus, all subsequent pulses are summed in counter 7, and its contents are information about the true position of the mechanism relative to its zero point.

5 The operation of the device in the remaining positions of the mechanism occurs in a similar way, and information is not entered into the counter 12 when the mechanism is re-moving in the same direction.

Subject invention

A device for measuring the position of a mechanism, such as swaging mill rolls, comprising a disc, a sensitive element, a reversible counter with an input matching circuit, a signal generation unit for moving the mechanism, a counting pulse generation unit, characterized in that, in order to eliminate the error caused by

0 the mechanical backlash of the melada controlled by the axis and the axis on which the disk is fixed, it is equipped with a logic circuit consisting of an information recording block, an error counter, an analysis block for a zero and

5 of the coincidence circuit, wherein the signal generation unit of the direction of travel is connected to the information recording unit, the counting pulses generating unit is connected with the coincidence circuit, and the output of the analysis unit is

zero - with the input matching circuit of the reversible counter.

 Output