SU656084A2 - Device for registering the number of hydraulic press loading cycles - Google Patents

Description

(B4) USTRiPSTVO FOR QUANTITY loading cycle HYDRAULIC PRESS additionally block, wherein the lateral bending force sensor is connected to one input of the calculator, the other input of which is connected to the series connected sensor movement moving crosspiece and an amplifier, and the output of the calculator is connected to the respective inputs of inverters, other inputs which are connected to a bending tension sensor and a lateral bending force sensor, and the outputs of the corresponding recording units through the OR element are connected to telnomu unit. Figure 1 shows a structural electrical circuit of the device; Fig. 2 is a schematic of the installation on the columns of the columns, which are part of the lateral bending force sensor. Pressure sensors 1, the number of which is chosen according to the number of independent groups of working cylinders (for example, two groups), are installed on the hydraulic pipelines of these cylinders (not shown) and connected to the inputs of their amplifiers 2. The recording blocks are connected to the inputs of the amplifiers of the threshold elements 3, which are set accordingly to operate at the minimum average and maximum signal values, and electro mechanical counters 4. The bending voltage sensor 5 consists of two bridge circuits 6, amplifiers 7 and p 8. The bridge circuits 6 are formed by electrical resistance meters of the resistance of diametrically placed strain gauges (not shown) mounted on the surface of the press column in the cross-sectional plane along the axes displaced at an angle of 90 to each other. The outputs of the bridges through amplifiers 7 are connected to the inputs of the adder 8 The sensor 9 side bending force, with which the mobile traverse of the press presses the columns, consists of two tensometric bridges 10 and associated with them through the amplifiers 11 of the adder 12. The bridge 10 is formed of four electrical converters The intensifications are arranged in pairs in two units 13. The units are installed one in each of the four independent hydraulic systems of the lowering cylinders 14, which are located on the movable cross member. Each column 15 is equipped with four synchronization cylinders 14 in the same horizontal plane, and their plungers (not shown) abut against the guide sleeve 16 of the movable yoke along the axis misaligned at an angle of 90 to each other. Each of the two bridges 10 consists of two mesos 13, which are installed in the hydraulic system of diametrically located cylinders 14. A displacement sensor 17 for moving the movable cross beam of the press is mounted on the upper fixed crossbar and is connected to the cross beam rack. OK is a rotary transformer, the output voltage of which is proportional to the angle of rotation of the rotor relative to the stator, and the angle of rotation is a function of the distance between the lower fixed transverse and movable head plate of the press (not shown). The displacement transducer output through amplifier 18 is connected the input of the calculator 19, and the output of the lateral bending sensor 9 is directly connected to the second input of the calculator and connected to the corresponding inputs of the converters 20, to the other inputs of which, respectively the outputs of the calculator 19, the output of the bending voltage sensor 5 and the outputs of the amplifiers 2 are connected. The converter 20 may be of known construction as a transformer-type magnetic amplifier. The outputs of the converters 20 are connected via threshold elements 21 to their registered units 22 like blocks 3 and 4, and the inputs of blocks 22 registering the maximum loading thresholds are connected via the OR element 23, the number of inputs of which corresponds to the number of places of the overload parts with the executive unit 24. Raav "h". l ghupaich j.m.yn. .- "" to with. The proposed device is as follows. The pressure in the working hydraulic cylinders of the press is converted by sensors 1 into an electrical signal proportional to it, which through amplifier 2 enters threshold elements 3. When the output signal of the amplifier reaches the trigger level of threshold element 3, a voltage pulse appears at its output; which the electromechanical counter 4 triggers. If there is pressure in the working cylinders of the press column, they are stretched by longitudinal forces, and the tensile stress in the columns is proportional to this pressure and, therefore, by the electrical signal from the sensors. In the presence of bending of columns, a bend tension sensor 5, installed in the cross-sectional plane of the column, produces an electrical signal and. proportional to the modulus of the mechanical / sogo voltage from the bending moment, acting in this plane. The bridge circuits 6 convert surface mechanical stresses into electrical signals. These signals are fed through amplifiers 7 to the adder.

8, performing geometric addition by the formula

.-Vu.Su.

and,

m y z

When supplying bridges with a constant current, the adder must perform a squaring, algebraic addition, and root extraction. The supply of bridges with alternating current allows one to simplify geometrical addition and to replace it with a well-known method of algebraic addition of two electrical signals, the variable voltages of which are shifted in phase by 90 ° relative to each other.

After a sweep, the signal from the adder 8 is proportional to the mechanical voltage module.

Sensors lateral bending force 9 work the same way as sensors 5. The only difference is in the measurement of physical quantities. which sensor 9 is fluid pressure. Strain gages 10 convert pressure differences in diametrically located synchronizing cylinders 14 into a proportional electrical signal. With an increase in the lateral bending force, the pressure in the hydraulic systems of cylinders located on the side of this force increases, and in cylinders installed on the opposite side of the column, the pressure at this moment drops. The forces on the hydraulic cylinders are transmitted through the sleeves 16 of the movable crosshead. The pressure differences in diametrically located synchronizing cylinders for one column are proportional to the components of the lateral bending force acting at the point of abutment of the sliding sleeves 16 of the movable yoke in the press columns. The electric signals of the bridges 10 through the amplifiers 11 are fed to the adder 12, similar to the adder 8, which geometrically adds the input signals according to the formula, where and / py is an electrical signal proportional to the module of the lateral bending force / F /; and Q is an electrical signal from the first coin 10, proportional to the pressure difference in one pair of cylinders 14 ДА electrical signal from the second bridge, proportional to the pressure difference in another pair of cylinders located at an angle of 90 to the first pair. An electrical signal proportional to the distance between the lower fixed crossbar and the center of the sliding block of the movable cross beam. Movable traverse when moving with the help of a toothed rack rotates

the rotor of the sensor 17 through the corresponding gearbox, the output voltage of the sensor is proportional to the angle of rotation of the rotor relative to the stator.

The electrical signals from the lateral force sensor 9 Uffi and from the displacement sensor 17 are; through the amplifier 18 comes to the transmitter 19, which builds the signal llx in the square and umi

knock signals and and

Ifl Output voltages of the calculator 19

proportional to the product

X VF / X If-Output electrical signals from sensors 5.9 and calculator 19 are sent to the control windings of converters 20, and electric signals from amplifiers 2 to threshold elements 3 and to corresponding control windings of converters 20. These signals are converted into proportional magnetic signals. flows with corresponding scale factors, determined by selected control windings, and these flows are algebraically added by the formula

.KC-- ° Vf B / Mr "J / P / +, P ,, p ,,

where .. is the output signal. AnvlKt

sweeper 20, proportional to the maximum mechanical stress in a controlled section of the press column;

and, - an electrical signal proportional to the pressure in the first hydraulic system of the working cylinders of the press;

Ug is an electrical signal proportional to the pressure in the second hydraulic system of the working cylinders of the press;

and / m / electrical signal proportional to the module of the bending moment;

Claims (1)

Vffj is an electrical signal proportional to the modulus of lateral bending force; and., is the electric signal proportional to the distance between the fixed lower cross member and the center of the sliding sleeves of the movable cross member; a, t), c, d, e, f are scale factors that take into account the degree of influence of controlled forces on the protected place of the base part and the direction of action of these forces, i.e. taking into account the sign before the term. Transducers 20 are distinguished from each other by scale factors a, b, c, d, e, f, which are obtained by calculation for controlled sections and refined when debugging systems 1 by means of strain gauges. The signals from the transducers arrive at the corresponding threshold elements 21 and recording units 22. When the signal from the transducer reaches its maximum and the recording unit 22 of the maximum threshold is triggered, the signal is applied through the OR 23 function element to the execution unit 24, the triggering of which causes an abnormal high pressure in the working cylinders press. . The described device has advanced functionalities due to the introduction of flexural strain sensors, lateral bending force and displacement of the movable traverse of the press, which allow to take into account additional loads of basic parts, in particular press columns, simultaneously under the influence of working cylinders and bending forces. , which are due to the peculiarities of the processing of workpieces. In addition, the benefit of introducing the element OR appears the possibility of emergency shutdown of high pressure in p bochih press cylinders and increase the accuracy level of the stress edited rhenium individual sites basic parts. 8 The invention The device for recording the number of loading cycles of a hydraulic press according to ed. No. 332481, characterized in that, in order to increase accuracy, a voltage sensor, a side bending force sensor, a moving crosshead displacement sensor, a calculator and an OR element connected to the executive unit are inserted into it, the side bending force sensor is connected to one of the inputs of the calculator, the other input of which is connected to the serially connected motion sensor of the moving beam and the amplifier, and the output of the calculator is connected to the corresponding inputs of the converters, the other inputs of which are connected to the sensor Bending voltage and a lateral bending force sensor, and the outputs of the corresponding recording units through the OR element are connected to the executive unit. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 332481, cl. G07 C 3/10, 30.06.70. ff Sonopffttfff fe muaaff Par.g