SU611844A1 - Apparatus for program control of lifting machine speed - Google Patents

Description

3

the element or on is between the zero input of the trigger and the inputs of the second and additional, elements I, and the subtractive input of the reversible binary counter is connected to the output of the key whose control input is connected to the output of the first element I.

The drawing shows a functional diagram of the device for programmatically controlling the speed of the lifting machine.

The device contains a path pulser 1, for example magnetically sensitive heads mounted in the immediate vicinity of hoisting rope 2, on which magnetic labels are applied. The output of car 1 is connected to the input of a reversible binary counter 3, the outputs of which are connected to the first 4 and second 5 AND elements and software control circuit of the machine.

The first And element is designed to decrypt the initial state of the counter 3, and the second, its final state equal to the maximum specified path of acceleration (deceleration) of the hoist. The specified motion path is set in the subtractive binary counter 6, the setup inputs of which are connected respectively to the decoders 7 of the predetermined path. The path code is entered by the operator using buttons 8. The outputs of the counter 6 are connected to the inputs of an additional element AND 9 intended

 DCI (ip) of the original state is readable1; . day counter 6,

The summing input of the reversing counter 3 is connected to a single L1,1 input of the trigger 10, and the subtracting .- to the output of the key 11, the control input of which is connected to the output of the first element 4, and the information output to the output of the additional element 9. 11 signals; when there is a signal on the information and no signal on the control input, the input of the subtractive binary counter b is connected to the output of the control key .1 2, whose information input is connected to the output of the playback unit 1, the first control input connected via an inverter 13 with the output of an additional element And 9, and the second control input with a single output of the trigger 10,

When a signal arrives at the first control input of the controlled key 12, signals ibiibi are generated at the output of the next, shifted in time with respect to the signals, П (x; stupid to the informational 1.K1. IaKiiM) when signals are present at both control inputs of the controlled the key 12 at the output of the latter is reproduced by two signals: one - coinciding with the signal arriving at the information input, and the other one shifted in time relative to it. The zero input of the trigger 1O is connected to

 the output of the element OR 14, the inputs of which are connected relative to the second element AND 5 and an additional element

0 AND :: 9, and a single input 15 of the trigger 10 is connected to the source of the starting pulse

The device works as follows.

five

In the initial state, the reversible binary counter 3 and the subtractive binary counter 6 are in a position where the output of the first And 4 element and the additional And 9 element contains a single signal, and a zero signal at the single output of the trigger 10. The operator, using one of the buttons 8, via the appropriate decoder 7 of the specified path enters into the subtractive binary counter 5 a number 6 equal to the number of path pulses corresponding to the path of movement of the lifting vessel (distance of motion) required in each case. In this case, the output of the element And 9 appears a zero signal, and on. inverter output 13unit. When a starting pulse arrives at input 15 of trigger 1O, the last

 triggered and on it, a single output appears signal, which is fed to

5 a summing input of the reversible binary counter 3 and a second input of the control key 12, preparing the operation of the reversal binary counter 3 and enabling the operation of the control key 12.

0

At the same time, the signal arrives at the first input of the controlled key 12c of the output of the inverter 13. The presence of a zero signal at the information input of the controlled key 12 causes the absence of a single

5 signal at its output.

When the magnetic marks applied to the rope pass through the output of the playback unit 1, pulses appear that go to the input of the reversible binary counter 3 and the control key 12. These pulses are summed D reverse 1 of the binary counter 3, the output 16 of which sets the motion program, and is subtracted into counter 6. At the same time, since single signals are present at both control inputs of the control key 12, when each pulse is summed, one pulse will be recorded in the reversing binary counter 3, and

The subtractive binary counter 6 has two pulses, i.e., the subtractive binary counter 6 operates twice as fast as counter 3.

When reaching the maximum path

paaroHaj corresponding to the maximum specified speed, a single signal appears at the input of the second element B, which through the element OR 14 enters the zero input of the 1O flip-flop, returning it to the initial state corresponding to the end of the acceleration of the lifting machine. A zero signal appears at the single output of trigger Tri, which arrives at the summing input of the reversible binary counter 3 and the second input of the control key 12. The binary reversing counter 3 stops because its summing and subtracting inputs have no signals, and the subtractive binary counter 6 continues to subtract pulses arriving at its input from the output of the control key 12 (the signal is present only at the first control to the input).

At the moment trigger 10 is turned off, subtracting binary counter 6 will subtract the number of pulses corresponding to twice the number recorded in binary counter 3. As the lifting vessel moves further, Path pulses will be subtracted in counter 6 according to the movement of the lifting vessel. At the moment when the entire signal 6 recorded in the counter is subtracted, i.e., when only the path left in the reversing counter 3 is left to go to the end of the movement of the lifting vessel, a single signal appears at the output of the additional element 9 and Inverter 13 - zero. In this case, the controlled key 12 is closed, and a single signal is sent to the subtracting input of the reversible binary counter 3 via the key 11. The generation of a single signal at the subtracting input of the reverse binary counter 3 is the command to start decelerating the hoist. Thus, the slowing down of the hoisting speed begins when the path equals the acceleration path until the end of the climb. At the moment when a single signal of the reverse binary counter 3 arrives at the subtracting input, the latter begins to subtract the pulses generated by the playback unit 1 at the moment of its installation into the initial C1: 1 stage, a single signal appears at the output of the first element 4.

This signal is sent to the control

key input 11, disabling the last one. Hoisting machine stops signatures

Controls at output 16 disappear, while the circuit remains in its original state until a new cycle.

Depending on the distance between the receiving platforms with a multi-horizontal lifting installer, the device selects the following modes of operation: the section where the lifting machine reaches the maximum speed; the area where the lifting mask does not reach maximum speed.

The first case occurs when the total path of movement of the lift vessel specified in this peak is greater than the sum of the acceleration and deceleration path, and the second if the total specified path is less than the sum of the acceleration and deceleration paths.

In the latter case, at the output of the additional element And 9, a single signal is formed before the lift installation reaches its maximum speed, since the subtractive counter 6 during the acceleration period runs twice as fast as the reversing binary counter 3. When the deceleration signal is received, the reverse binary counter 3 switches to subtraction, not reaching the maximum speed of movement. In this case, the acceleration path always remains equal to the land path.

The use of the proposed device significantly improves the reliability of the lifting machine by eliminating the possibility of starting it without first specifying the path of movement, moreover, even the presence of a start command is not perceived as a command to start movement if the subtracting binary counter is in its initial state.

invention formula

A device for programmatically controlling the speed of the hoist machine, comprising a reversible binary counter, whose outputs are connected to the software control circuit of the machine and connected to the first and second logic elements AND, and the input is connected to a unit .. to play pulses of the path, a subtractive binary counter, the setup inputs of which are connected with a decoder of a given path, a trigger and a key, that is, so that, with the goal of increasing reliability, the device is equipped with a controllable key, an additional element And And s rteMOHTOM AND, PI. In this case, the inputs of the additional element I connectors with the outputs of the subtractive binary counter corresponding to its initial state, and the output is connected to the information input of the key and through the inverter to the first input of the controlled key, the second input of which is connected to the summing input of the reversible binary counter and the unit the trigger output, the information input of the control key is connected to the output of the pulse reproducing unit, and the BK1INP - to the input of the subtractive binary counter OR element is connected between

the zero input of the trigger and the cares of the second and additional elements I, and the subtractive input of the reversible binary counter is connected to the output of the key, the control input of which is connected to the output of the first element I.

Sources of information taken into account in the examination:

1. USSR author's certificate f 217618, cl. B 66B 1/24, 22.O7.68 (prototype).