SU637278A1 - External ram drive of double-acting crank press - Google Patents

Description

I

The invention relates to mechanical engineering, in particular to the design of mechanical presses.

A drive for an external slider of a double-acting crank press is known, which contains kinematically connected cranks of the external and internal sliders, power hydraulic cylinders connected to the external slider, and a hydraulic control system lj.

The circuit of the invention is to increase the service life and efficiency of the drive.

This is achieved in that the drive is provided with a gear mounted on the crank of the outer slider and a toothed sector mounted on the crank of the internal slider.

FIG. 1 shows a kinematic drive circuit and hydraulic cylinders; in fig. 2 - hydraulic drive circuit.

An external slide actuator of a double-acting crank press includes a toothed sector 1 rigidly connected to

the crank 2 of the internal drive 3 actuator, the driven gear 4, rigidly connected with the driven crank 5, the connecting rod 6 connected to the outer slide 7 through the spring 8. The mutual arrangement of the cranks 2 and 5 is chosen so as to ensure the necessary interaction on and internal popzunov. The plungers 8 are rigidly connected to the outer slider 7 and installed in

housings of 1T cylindrical machines mounted in the stands of the press frame.

The hydraulic system of the drive consists of a filling tank 11 containing a liquid supply sufficient to fill the cavities of the hydraulic cylinders 1C when the outer slide 7 moves down, the crank multiplier 12, the spool 13 with electromagnetic control and the pressure valve 14 intended for flow

neither in the tank 11 of the excess fluid injected by the NiynbTHnnHKaTopOM 12. A pressure gauge 15 was installed to control the fluid pressure.

The spring 16 and screw 17 are provided. When the crank shaft of the press rotates, the outer slide 7 performs translational motion until the leading leading sector 1 and zaeppen exit with the driven wheel 4, the moment of the release from the grip corresponds to the arrival of the crank 2 in the bottom dead center, the slider 7, the freeing volume of hydraulic cylinders, H, is filled up with a fluid that is under compressed air pressure sufficient to overcome the resistances in the line, from the filling tank 11 and the multiplier Ator 12 through volotnk 13, which at the same time is in the position shown in FIG. 2

When the pressure plate touches the blank, the ejector romagnet of the spool 13 is activated, after which the spool closes the channel connecting the filling tank 11 to the hydraulic cylinders 1O. Starting from this moment on, the hydraulic cylinders are supplied with liquid from the mutiplicator 12, the multiplier productivity exceeds the flow rate required by compensating for the increase in the volume of tsipindra and the elastic deformations as well as the liquid's capacity. The IlosTONjy part of the LIQUID pumped by the multiplier flows through the pressure valve 14 into the filling tank 11. The fluid pressure in the hydraulic cylinders and, consequently, the pressing of the flange is prepared to; the pressing plate is determined by the force of the spring 16, which can be measured within wide limits depending on the technological requirements of the process carried out on the press. The adjustment of the maximum pressing force is carried out by a screw 17,

After the end of the draw, the electromagnet of the control spool 13 opens, and it returns to its original position, connecting the cavity of hydraulic cylinders Yu with the filling tank 11, after which the toothed sector 1 and the gear 4 again engage and the outer slider 7 moves up, expels the liquid from hydraulic cylinders 10 into the filling tank 11. After the outer slide 7 has reached the uppermost position, the cycle is repeated.

The closure of the electromagnet circuit is made by a final switch mounted on the outer slider 7 and reacting to a change in the draft of the spring 8 at the moment of pressing the clamp with the workpiece. The opening of the indicated nepini is made by a limit switch triggered by a cam connected to crank 2 (the switches in the figures are not shown).

Claims (1)

Invention Formula An external slider drive of a double-acting crank press, containing kinematically connected cranks of the external and internal sliders, power hydraulic cylinders connected to the external slider, and a hydraulic control system, which is equipped with a gear wheel, fixed to the height of increase (service life and efficiency). on the crank of the outer slider and the toothed sector engaging with it, mounted on the crank of the inner slider. Sources of information taken into account in the examination: 1, USSR Author's Certificate NO 522070, class, in ZO B 1/26, 1975, ig.1 T rrU4 // f2 №f7V / 7 ///. 13 v / v / 5