SU770841A1 - Hydraulic press cross beam brake controller - Google Patents

Description

one

The invention relates to the field of mechanical engineering, in particular, to the design of hydraulic press control systems.

A hydraulic braking deceleration controller 5 is known, which contains an element comparing the signals for the height adjustment of the crossmember, transverse coordinate sensors and functional feedback sensor, an amplifier with an electro-hydraulic actuator connected to a hydraulic booster, a logic device associated with a key I. 15

The known regulator does not provide sufficiently accurate and reliable braking of the cross member due to the presence of mechanical transmission in the α-system of the functional feedback. 20

In order to increase the reliability and accuracy of operation, the braking controller of the hydraulic press crossbar is equipped with a differential signaling unit of the crossbar coordinate sensor, 25 quadrotor, a dead zone sensor with memory and a computing device with memory, and the functional feedback sensor is made in the form of a unit proportional to the inverse

connection and the associated nonlinear electronic converter, the output of which is connected to the input of the reference element, while the inputs of the computing device with memory are connected to the outputs of the sensors coordinates of the cross member, quad, logical device and key, and the output to the input of the electronic nonlinear converter the input of the differentiation unit is connected to the output of the sensors of the cross member coordinate, and its output is connected to the quadrant input, the input of the logic device is connected to the output of the proportional feedback unit.

The drawing shows a block diagram of a braking control of a cross member of a hydraulic press.

The regulator contains sensors 1, cross member coordinates, element 1 nt 2, power amplifier 3, electrohydraulic actuator 4, hydraulic booster 5, valve distributor 6, press 7I block 8 proportional feedback, electronic nonlinear converter 9, switch 10, switching height setting 11 lift, dead band sensor 12, logical device 13, computing device 14 with memory, quadrant 1 erecting the derivative of the moving crossbar 16. - The controller works as follows In the initial state, the cross member is at the lower preset point corresponding to the preset size of the forging. In this case, the signals, respectively, from the setpoint 11 of the lift height of the crossbar Od, the electronic nonlinear converter 9 (i, sensors 1 coordinates of the movable crossbar) are equal to zero, the output link of the electrohydraulic executive mechanism occupies the middle position, and the logic device 13 in the initial state issues command to move up. With the introduction of a given lifting height of the crossmember by a setting device 11 at the input of element t of comparison 2, a signal Ud appears and, through amplifier 3, causes the output link of the electrohydraulic actuator to move to the extreme position corresponding to the opening of the valves upwards. As the crossbeam rises, the signal Ug increases, and at the moment when the algebraic signals at the input equal zero, the computational device 14 memorizes the signal Up proportional to the square of the crosshead speed, and sets the electronic nonlinear converter. the magnitude of the signal Ug is proportional to the square of the crosshead speed As a result of this, at the input of Comparison 2, the algebraic sum of signals U, I, Ug will also be set to this moment, and at this moment will be the beginning of braking of the cross member when approaching a given upper point according to the law inherent in the electronic nonlinear converter. When the signal Ug changes, the phase of the signal at the output of the summation element changes. The output link of the electrohydraulic actuator in tracking mode for the decreasing difference U - (U + U) will begin to move to the middle position, causing the valves to close and the cross member to brake. Signal U pr this also decreases. When the crossbar reaches the upper set point U | - f, the output link of the electric motor is returned to the middle position, the valves are fully closed and the cross member stops at the given point. When U is approached zero and, consequently, the signal is proportional to the feedback, the logical device issues a command to reverse the cross member, under the action of which, the mutational key 10 turns off the RR signal from the summation element, as a result of which only the signals and and Ug. The output link of the electrohydraulic actuator, under the action of the signal U, moves to the other extreme position, valves are opened to allow the cross member to move down, the signal Ug decreases, and when the algebraic sum of the signals at the input of the computing device 14 is equal to zero, the value of the signal proportional to the square of the cross member speed occurs U, and the assignments on the electronic nonlinear converter of the magnitude of the signal U, proportional to the square of the velocity of the cross member. As a result, at the input of Comparison Element 2, the algebraic sum of the signals U.U.U.U will also be set to zero at this moment, and this moment will be the beginning of braking of the cross member when approaching the lower given point according to the law inherent in the electronic nonlinear converter. When the signal and changes, the signal phase of the sug / 1 world element changes. The output link of the electrohydraulic actuator in the mode behind the decreasing difference and - Ug will start moving to the middle position, causing the valves to close and the cross member to brake. The Ug signal at ET9M also decreases. When the crossbar reaches the lower set point and the "O" output link of the electrohydraulic actuator comes to the middle position, with Ug O, the valves close completely and the cross member stops at the given point. When Ug and, therefore, a signal proportional to feedback, the logical device issues a command to reverse the cross member, under the action of which the switch key 10 connects the signal U to the sum element, as a result of which the signals U will again be received Ug and the cycle repeats. When changing the zone, the insensitivity of the press equipment with the help of the dead zone sensor 12 will be corrected at each stroke by the dead zone, embedded in the electronic nonlinear converter in accordance with the real one. The use of the braking regulator will allow optimizing the braking of the cross member in time when approaching the lower and; erhney to specified reverse points, improve forging accuracy, reliability of press operation, operation and flexibility of electronic non-linear converter tuning, simplify the design of electric

Claims (1)

Claim A hydraulic press cross member braking regulator containing an element for comparing the signals of the transducer- (0 ka of the lifting height of the cross member, sensors of the coordinate of the cross member and the sensor. 'Functional feedback,. An amplifier with an electro-hydraulic actuator connected to the hydraulic booster, a logic device associated with a key, characterized in that, in order to increase the reliability and accuracy ra boots, it is provided with cross member unit Bani signal sensors, quad, differentiation dead zone coordinates dates _m with a memory and a computing device with memory, and the functional feedback sensor is made in the form of a proportional feedback block and an associated electronic nonlinear converter, the output of which is connected to the input of the comparison element, while the inputs of the computing device with memory are connected to the outputs of the transverse coordinate sensors , a quadrator, a logical device and a key, and the output is with the input of an electronic nonlinear converter, the input of the differentiation unit is connected to the output of the coordination sensors s cross member, and its output - to the input of the quad, the logic device input coupled to an output proportional to the feedback unit.