CS272305B1 - Device for high-pressure liquid's consumption minimalization with hydraulic mechanismes - Google Patents

Abstract

The device reduces high pressure consumption liquid and confines it to it the movement of the anvil in which it occurs for forging. It consists of an evaluation block, three times input signal limiter, regulator position of actuator, position sensor anvil, servo motor position sensors and of the actuator position input block. Odmčřovaoi output of the anvil position sensor (4) It is associated with a metering input (a) evaluation block (l) whose logical output is connected by β logic input (h) a voltage limiter (2) of the input signal, whose non-cutting input (c) is associated with the input of the submitter servo motor position block (6) and limit output with input (d) of the controller (3) the position of the servomotor to which it is located feedback input (e) is connected measuring the output of the position sensor (5) servomotor.

Description

The invention relates to a device for minimizing the consumption of high-pressure fluid in hydraulic mechanisms, in particular in hydraulic forging presses.

With hydraulic forging presses it is possible to realize the movement of the anvil either with reduced force without claim to high pressure fluid, in this way of anvil movement the hydraulic circuit of the press consumes low pressure liquid from the so-called pinwheel. station. At the same time, the costs for the production of a low-pressure liquid are negligible in comparison with the costs for the production of a high-pressure liquid. The existing control method is characterized by gradual continuous control of the stroke of individual valves by turning the rocker shaft by means of an electrohydraulic servomotor with proportional operation, where small deflection of the servomotor corresponds to valve opening for low pressure fluid and large deflection of servomotor corresponds to valve opening for high pressure fluid. Until now, it has not been possible to minimize the consumption of high-pressure fluid when operating a hydraulic forging press, because existing control systems allow the use of full force even to bring the anvil closer to the forging.

The disadvantage of the current control method is that during the operation of the hydraulic forging press, the consumption of high-pressure fluid is greater than necessary.

These disadvantages are eliminated by the device for minimizing the consumption of high-pressure fluid in the hydraulic mechanisms according to the invention, consisting of an evaluation block, input voltage limiter, servomotor position controller, anvil position sensor, anvil position sensor, servomotor position sensor and servomotor position input block.

The essence of the device according to the invention is that the metering output of the anvil position sensor is connected to the metering input of the evaluation block, the logic output of which is connected to the logic input of the input signal voltage limiter. the input input of the servomotor positioner. The metering output of the servomotor position sensor is connected to the feedback input of the servomotor position controller.

The progress achieved by the device according to the invention is that the movement of the anvil with full force can be realized only if the anvil is already supported on the forging with reduced force and thus the consumption of high pressure liquid is limited exclusively to the part of the anvil movement in which the forming takes place. forging, which leads to minimizing the consumption of high-pressure fluid, and thus to reducing the energy intensity of the forging process.

The device for minimizing the consumption of high-pressure fluid in the hydraulic mechanisms according to the invention is schematically illustrated, for example, by a block diagram in the accompanying drawing.

The device according to the invention consists of an evaluation block 1, formed for example by a pulse counter and a digital comparator, a voltage limiter 2 of the input signal, formed by a voltage limiter with an operational amplifier, a servomotor position controller 6, which is an operational amplifier incremental photoelectric sensor. Furthermore, the device according to the invention consists of a servomotor position sensor 6, formed for example by an industrial potentiometer, and of a servomotor position input block 6, which is, for example, a potoniometer operated by an input lever. The individual blocks 1 to 6 are then connected as follows:

The metering output of the anvil position sensor 6 is connected to the metering input and of the evaluation block 1, the logic output of which is connected to the logic input b of the input signal voltage limiter 2, the non-limiting input of which is connected to the input output. The limiting output of the voltage limiter 2 of the input signal Jo is connected to the input input d of the servomotor position controller £.

The function of the device according to the invention is as follows. The actuator position input block sets the position of the servomotor at which the anvil moves towards the forging. The anvil position sensor 4 generates pulses which, for processing in the evaluation block 1, activate a signal level at its logic output which corresponds to limiting the signal at the input d of the servomotor position controller 6 to a value corresponding to the anvil movement with reduced force. If the set value at the input output of the input block £ of the servomotor position is larger, it will be limited and the movement of the anvil will be realized in this case only with a reduced force, without consumption of high-pressure fluid. This condition lasts until the anvil begins to rest on the forging. This decreases the speed of movement of the anvil, the frequency of pulses at the metering output of the sensor to the anvil position decreases, and thus the signal at the logic output of evaluation block 1 changes to a value corresponding to unblocking the input output of the servomotor position input block. The operation of the input signal voltage limiter 2 is blocked and the signal level at the input input d of the servomotor position controller E is in this case equal to the signal level at the input output of the servomotor input block jS, thus allowing full anvil movement. Thus, the anvil begins to move again and the forging is formed. The signal level at the logic output of evaluation block 1 now does not change. This state lasts until the signal level at the input output of the servomotor position input block £ changes to a value corresponding to the movement of the anvil in the opposite direction, i.e. away from the forging. In this case, the signal level at the logic output of evaluation block 1 changes to the original value, and the next time the servomotor is set to move the anvil towards the forging by the servomotor position input block 6, the situation is repeated and the anvil is realized with reduced force without high pressure fluid consumption. until the next anvil lands on the forging.

The device according to the invention is particularly suitable for hydraulic forging presses, where it allows a considerable reduction in the energy consumption of the forging process.

Claims (1)

OBJECT OF THE INVENTION Device for minimizing high-pressure fluid consumption in hydraulic mechanisms, consisting of an evaluation block, input signal voltage limiter, servomotor position controller, anvil position sensor, servomotor position sensor and servomotor position input block, characterized in that the measuring output of the sensor (4) the anvil position is connected to the metering input (a) of the evaluation block (1), the logic output of which is connected to the logic input (b) of the input signal voltage limiter (2), the non-limiting input (c) of which is connected to the input output of the input block (6). ) of the servomotor position and a limiting output with the input input (d) of the servomotor position controller (3), to the feedback input (e) of which the measuring output of the servomotor position sensor (5) is connected.