SU1216342A1 - System for controlling the impact energy of electromagnet hammer - Google Patents

Description

1.1

The invention relates to high power electromagnetic impact machines (hammers) used in the mining, construction and other industries.

Depending on the nature of the process, it is necessary to regulate the energy of hammer blows.

The purpose of the invention is the reduction; the performance of the hammer by adjusting the pulse duration in the winding of the reverse stroke of the hammer.

FIG. Figure 1 shows the experimentally determined dependences of the energy and frequency of hammer blows with. The static pulling force is 800 N from the stroke of the striker 5 for various values of the electromagnetic force of the winding of the forward stroke in FIG. 2 — the proposed system for regulating the impact energy.

The system contains thyristor rectifiers 1 and 2 with control units 3 and 4, current transformers 5 and 6, connectors 7 and 8, current regulators 10 connected to the inputs of control units 3 and 4, position sensor 11, switching unit 2 thyristor The rectifier, the amplifier-shaper 13, the output of which is connected to the input of the converter switching unit, and the input - to the down position sensor.

The system works as follows.

When the start button is pressed, the switching unit 12 of the thyristor rectifiers provides the enabling signal to the control unit 3 and prohibiting the control unit 4. In the winding 14, the current increases to the value of the setpoint of the current regulator 9. Od, temporarily, when the Start button is pressed, the charge of the capacitor 15 of the amplifier 13 starts to charge and, when the base and emitter potentials are equal, the transistor 16 opens,

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it opens the transistor 17 and the differentiating circuit generates a control signal going to the switching unit of the thyristor rectifiers 12,

From which it translates the thyristor rectifier 1 into the inverter mode and gives permission to turn on the thyristor rectifier 2, the energy accumulated in the winding 14 returns to the supplying grid. The striker makes a free run out, and then begins to move down under the action of its own weight and electromagnetic force of the forward winding. The magnitude of this force is determined by the reference signal supplied to the current regulator 10 from the R 18 potentiometer. The striker strikes the treated surface. Simultaneously with the shock, a signal from the sensor is issued.

20 M position on the inputs of the switch 12 of the thyristor rectifiers and forces: body 13, the switch unit I2 switches the triac rectifier 2 to the inverter mode, and the thyristor terminal 1 to the rectifier, then, using the signal from the amplifier, shaper RE translates thyristor rectifier into inverter, and thyristor

30 straightener 2 - to rectifier mode. The hammer operation cycle is repeated, i.e. The power of the hammer is controlled by an amplifier-former.

Thus, in the system, the duration of the current pulse in the reverse winding and, consequently, the stroke length of the striker is controlled by a potentiometer 19. When installing

. the maximum current setting in the windings is the regulation of the impact energy of the hammer along the straight lines from O to A, .j, while the frequency of impacts automatically varies along the curve

45 "° -tlk system provides the maximum possible

hammer performance in regulating impact energy in the widest possible range.

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Circulation 470 Subscription

Branch ShSh Patent, Uzhgorod, Project.St., .4

Claims (1)

ELECTROMAGNETIC HAMMER SHOCK ENERGY CONTROL SYSTEM, consisting of a position sensor and two identical current control units, each of which contains a thyristor rectifier, at the input of which a current transformer is connected, the input of which through the rectifier is connected to the input of the current regulator, the output of which is connected to the first input of the unit control, and its output is connected to the control input of the thyristor rectifier, the output of which is connected to one of the windings of the electromagnet, and the switching unit of the thyristor rectifier the outputs of which are connected to the second input of the control unit, and the Start and Stop buttons, respectively, are connected to the first and second inputs of the thyristor rectifier switching unit, the second outputs of which are connected to the negative power supply bus, characterized in that, in order to increase performance by adjusting the pulse duration in the reverse winding of the hammer, the system is equipped with an amplifier-former, the input of which is connected to the position sensor, and the output to the third input of the thyristor switching unit rectifiers, to the fourth input of which a position sensor is connected. 1 . 121