SU796784A1 - Device for interlocking electric loads - Google Patents

Description

(54) ELECTRIC LOAD BLOCKING DEVICE.

one

The invention relates to control systems, in particular to locking devices of process control systems, for example, during transportation of materials.

A device of electrical interlock, containing two electromagnetic contactor with two working coils. The interlocking device also includes the first and second normally open and third and fourth normally closed switches and has means that soak the third and close the first switches when the first coil is energized. There are similar means that lock the second and open the fourth switches when the second coil is turned on. The first and fourth switches are connected in series with the first coil, and the second and third switches are connected in series with the second coil 1.

The disadvantage of this device is an electro-oxidation that each electromagnetic contactor must have open contacts according to the number of electrical loads. When the number of loads increases, for example, up to 40-50, electromagnetic contactors with such a number of contacts become more complex, and their practical implementation is difficult.

The closest technical

The essence and the achieved result to the present invention is an electrically interlocking device of selective activation, containing electrical loads and including elements

the number of electrical loads) with two opening and two closing contacts, one of which forms a control circuit. Distributing contacts of connecting elements are connected

in two straight alternating sequential chains, one of which is connected to one pole of the power source from the contact side of the first switching element, and the second

contact side of the last switching element - to the other pole of the power source. The control circuits of the connecting elements are connected in parallel between the chains, with

Claims (2)

Each control circuit is connected to the first chain before one of its separate contact, and to the second chain after its other normally open contact. Each control circuit includes a stop button and a start button connected in parallel with the closing contact of control circuit 2. However, electromagnetic relays are used in this device, which makes it more complex and increases the total cost. The purpose of the invention is to simplify the device. For this purpose, in the blocking device of electrical loads, comprising switching elements according to the number of switched loads with two opening and two closing contacts, the opening contacts are connected in two successive chains, the first of which are connected to one of the poles of the power supply side of the contact of the first including element, the first of the closing contacts of each including element is connected to the first chain before its opening contact with the stop The poles of the power source, and to the second chain, after their opening contact, loads are connected in parallel between the end of the second chain from the side of connecting the first closing contact to each of the switching elements and the other pole of the power supply, and each terminal is connected in series with the second closing 1 contact of its incorporating element. The drawing shows a diagram of the device for blocking electrical loads. The device for blocking electrical loads contains electrical loads 1 and switches 2 having two break contacts 3 and 4 and two closing contacts 5 and 6. The opening contacts 3 are connected in series with each other to form a chain 7. Breaking contacts 4 are connected in series with each other to form a chain 8 , the beginning 9 of which is connected to the pole 10 of the power supply (not shown) The closing contacts 6 of the switches 2 are connected between the chains 7 and 8, each terminal 6 is connected to. the chain 8 before the disconnecting contact 4, and the chain 7 - after the opening contact 3. Between the end 11 of the chain 7 and the pole 12 of the power supply source electrical loads 1 are connected in series with the closing contacts 5. The device for blocking the electrical loads works as follows. in the initial position, all switches 2 are turned off. When, for example, the second switch is turned on, the breaker contacts 3 and 4 of this switch open, and contacts 5 and 6 close. The voltage from pole 10 through closed contacts of 4 previous switches, closed contact 6 of this switch, closed contacts of 3 subsequent switches and closed contact 5 of this switch is supplied to the second electrical load 1. At the same time, contacts 4 and 3 turn off the power before and after switches. When using electrical loads with a current of up to 3 A in this device with centralized control, the device can be simplified and operated by replacing the relay with the stop and start buttons with a single switch. Claims of the invention A device for blocking electrical loads, comprising switching-on elements according to the number of switched loads with two expansion and two locking contacts, the opening contacts connected in two successive chains, the first of which are connected to one of the poles of the power supply from the contact side of the first switching element, the first of for each contact, each including element is connected to the first chain before opening its contact from the side of the power supply pole and to the second chain - after its break contact, which is distinguished by the fact that, for the purpose of simplification, the loads are connected in parallel between the end of the second chain from the side of connecting the first closing contact of each of the switching elements to it and the other pole of the power supply, each of the loads connected in series with the second closing contact of its incorporating element. Sources of information, taking into account when e.peramise 1. US patent number 3398329, l. 317-136, published. 1968. 2. Authors certificate of the USSR 145267, cl. G 05 B 9/02, 1961 (prototype).