SU1256924A1 - Arrangement for metal-cutting machine feed control - Google Patents

Description

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The invention relates to control systems and can be used in the management of machine tool assemblies.

The purpose of the invention is to improve the accuracy of the device by eliminating the influence of the preparation time of the relay for operation on the duration of the working feed.

Figure 1 presents a schematic arrangement of sensors (path switches); Fig. 2 is a circuit diagram of the device.

The device for controlling the supply of the metal cutting machine contains connected to outputs 1 and 2 of the power source via button 3 on the winding 4 of the first intermediate relay with closing contacts 5-7 and softening contact 8, winding 9 of the second intermediate relay connected to the terminals 1 and 2 of the power source through a switch-on button 10 and having closing contacts II and 12 as well as a winding 13 of a third intermediate relay with closing contact 14 and opening contacts 15 and 16 The device also contains working feed electromagnets and strictly stroke, respectively, with windings 17 and 18 and two time relays with windings 19 and 20. The first time relay has a closing contact 21, and the second one opens contact 22. The sensors of the initial position 23,; The end position 24 and the work feed 25 are path switches and respectively have contacts. The initial position sensor 23 has a disconnecting contact 26, the end position sensor 24 has a closing contact 27 and a disconnecting contact 28, and the sensor 25 has a disconnecting contact 29 and a short circuit contact 30.

The device works as follows.

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Pressing the switch-on button 3 energizes the winding 4 of the first intermediate relay, which through contact 5 becomes self-powered. Contact 7 of this relay includes electromagnets of working feed and high speed with windings 17 and 18, respectively, due to which the power table is supplied. When it is moved, the trigger switch 23 is turned off and the path switch 25 is turned on, forming the power circuit of the time relay winding 19. Contact 2-9 working switch

5, the feed circuit of the winding 18 is cut off. electromagnet of high speed. The power table moves with the feed speed, the duration of its movement is controlled by the first relay

0 time with a winding 19. When this relay is triggered, a time delay through contact 21 causes the second time relay with a winding 20 and the third intermediate relay with a winding 13 to turn on.

Contact 16 breaks the power supply circuit of the winding 17 of the electromagnet of the working stroke, and contact 15 breaks the winding 19 of the first time relay. The time delay countdown of the second time relay begins, defining a pause in the working feed of the tool and ensuring chip removal. During this time, the first time relay has time to get ready for work. After a time delay, the coil 17 of the work feed electromagnet and the coil 19 of the first time relay are connected again. A working feed of the power table is carried out. The cycle repeats until at the end of processing the path switch 24 is triggered. As a result, the coil 4 of the first intermediate relay turns off and the second intermediate relay turns on with the coil 9, which causes the table to quickly retract.

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Claims (1)

A METAL-CUTTING MACHINE CONTROL DEVICE comprising a home position sensor. with NC contact, end position sensor with NO and NC contacts, feed sensor with one NC and one NC contacts, the first intermediate relay with three NC and one NC contacts, the winding of which is connected to the power supply terminals through the NC contact of the final position sensor and the first a power button shunted by the first make contact of this relay, the second intermediate relay with two make contacts, the winding of which is connected to the source outputs and power through the NC contact of the initial position sensor and the second power button, shunted in parallel by the NC contact of the end position sensor and the first NO contact of the second intermediate relay, the first time relay with the NO contact having in its winding circuit a NO contact of the working feed sensor and a second the make contact of the first intermediate relay, the second time relay, in series with the winding of which the make contact of the first p Barely, as well as two electromagnets, the winding of the first of which is connected to the terminals of the power source through the third make contact of the first intermediate relay, and the winding of the second through the third make contact of the first intermediate relay and the make contact of the working feed sensor connected in series with the disconnect the contact of the first intermediate relay and the second make contact of the second intermediate relay, characterized in that, in order to improve the accuracy of the device, it is supplemented by a third intermediate relay with one make and two make contacts, the winding of which is connected through the disconnect contact of the second time relay and the make contact of the first time relay to the common point of connection of the second make contact of the first intermediate relay and the first make contact of the third intermediate relay, the other end connected to winding the first time relay, and the make contact of the first time switch is shunted by the make contact of the third intermediate relay, and the second time the make contact of the third intermediate relay is connected in series with the winding of the first time relay. 1256924 A1 ί