SU620409A1 - Protective device to press - Google Patents

Description

The invention relates to forging and pressing machinery, namely, devices protecting the press from breakage.

A similar device is known, containing parallel-connected relays of a press controller, a transistor memory node and a divider,

However, a rapid change in the positions of the press mechanical parts is often out of order, since the product is hit by the stop lever, which hits the end switch with high speed, which leads to the latter breaking or weakening the spring springs. As a result no-programmed stop of the press is possible. The working time is spent on its subsequent adjustment and adjustment.

The whole cacutena is an increase in press performance and durability.

This is achieved by the fact that the proposed device is equipped with a contactless p & a switch installed in the zone of removal of the stamped products from

ferromagnetic materials with the possibility of adjusting the gap between it and the product and electrically connected to the input of the memory node via a forming bridge, the transistor of the memory node being made composite.

The drawing shows an electrical circuit of the press control device with a safety device.

Claims (1)

The press protection device contains electrical interconnected limit switches 1 and 2 of the press control device, a non-contact relay switch 3 installed in the pick-up area of the stamped products with adjustable gap relative to the latter forming bridge 4 and a memory node consisting of a composite transistor 5, thyristor 6 and a filter formed by a capacitor 7 and a diode 8. A voltage divider consisting of resistors 912 and zener diodes 1 is provided to protect the device from the effects of voltage jolts. 3 and 14, resistances 15 and 16 are matching. A resistor 17 serves to open the thyristor 6, and a resistor 18 is used to close the circuit. A lamp 19 is installed in the circuit which controls the operation of the thyristor 6a. The resistor 20 reduces the voltage on the lamp 19. A fuse 21 is installed in the circuit to protect the device from breakage. The press works as follows. When unloaded from the press, the part passes by a contactless relay switch 3, which sends an electrical impulse to the forming bridge 4. The latter passes a negative utility impulse to the base of the composite transistor 5, opens it, after which the voltage from resistance 17 opens the thyristor 6 and relay 22 is triggered. Since rectifiers in the press scheme are used without smoothing the pulsations, a filter is provided in the scheme of the proposed safety device. Open thyristor 6 is not closed until it is short-circuited by the relay contacts, 1 or the voltage is turned off. Due to this property, the unloading storage memory scheme works. The automation circuit is powered through parallel-connected, normally open contacts of the relay 22 and 2 of the commanding machines of the press. If any of these fail, the press stops. For accurate closing of the thyristor 6 and preparing the device for the next press run, the contacts of the relay 1 of the press controller and resistor 18 are used. To control the operation of the thyristor 6, an electric lamp 19 is used, according to the brightness of its channel it is possible to judge the operation of the thyristor 6 and the composite transistor 5. Resisty 20 is intended to reduce the voltage of the electric lamp and extend its service life. At 1F of one of the circuit elements (6 or 5), the lamp blush does not change (lights up in full) the non-contact relay switch 3 sets FROM the products to be processed with a different gap depending on the speed of the products. The faster the product passes the contactless relay switch, the smaller the gap between the passing product and switch 3. This gap fluctuates within 0, 14 mm. To control the unloading of each subsequent product, the protective device is returned to its initial state by a relay 1 contact operating from the press control unit. The use of the proposed protective device allows to increase the turnaround time of operation of the gesso equipment, to provide reliable control of the output of the stamped product from the press, to eliminate the exit from the building tool and the pressing equipment, to minimize its forced downtime for adjusting and adjusting. The invention provides a protective device for a press containing parallel-connected relays of a press command device, a transistor memory unit and a divider, characterized in that, in order to increase reliability and service life, it is equipped with a contactless relay switch installed in the area for removing stamped products with adjustable possibility him and products, the output of the switch through the forming bridge is electrically connected to the input of the memory well, and the transistor of the memory node is made composite. Sources of information received during the examination: 1 „Application No. 2341976/27, cl. In ZO B 15/28, 1976, for which the decision to issue an author's certificate was made. yy A2 to the scheme automatics