SU1488893A2 - Control unit of machine indexing table - Google Patents

Description

The invention relates to electrical engineering and can be used in track guidance systems for metal-cutting machines. The purpose of the invention is improving reliability. The device contains end switches and reverse start switches with contacts 1,

2 and 3 - 5 respectively, the inclusion relay with contacts 7-12, the first

ЗЦ_ 1488893 А 2

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1.5, the second intermediate relay 16 with contacts 17-21, the relay 22 braking with contacts 23,24, the mechanisms for moving the table "Forward", reverse and braking respectively with control coils 25-27, button 28 "Start". In the initial state, the limit switch of the end of the reverse is pressed, the limit switch of the beginning of the reverse is released. When you press the "Start" button 28, the dividing table of the machine starts moving to the next position. In this case, the limit switches interact with a group of stops, made in the form

four

combs. The number of stops equals the number of positions for stopping the dividing table, and the distance between the stops corresponds to the distance between the positions of the dividing table. The table dividing cycle consists of moving forward and reverse to preload against the stop, and the limit switch is turned on twice during the cycle time. The introduction of a braking mechanism with a control coil 27 makes it possible to reduce the speed of movement of the table when approaching the reverse position, which increases the reliability of the device. 3 il.

The invention relates to electrical engineering, can be used in track guidance systems for metal-cutting machines and is an improvement of the invention by author.

C 687486.

The aim of the invention is to increase reliability.

FIG. 1 shows a schematic ₄ diagram of the device for controlling the index table; in fig. 2 is a graph of the switching of the end switches and the beginning of the reverse when the dividing table moves from the η position to the n + 1 position; in fig. 3 - interaction of the limit switch with stops.

The device contains end-of-start and reverse-start limit switches, the first of which has 1 and 1 opening contacts, 2 contacts, and 2 second closing contacts and 4 and 5 opening contacts, a switching relay with coil 6, 7-10 closing contacts and 11 and 12 opening contacts, the first intermediate relay with coil 13 and closing contacts 14 and 15, second intermediate relay with coil 16 closing 17-20 and disconnecting 21 contacts, braking relay with coil 22 and closing contacts 23 and 24, coil 25 of the table forward movement mechanism, coil 2b roar mechanism XRD table spool braking mechanism 27, the button 28 "Start", some conclusions 6,13,16,22 and coils 25 - 27 are combined and connected to one terminal of the power source, the other terminal of switch relay coil 6 is connected to the other terminal of the power source ___

through serially connected button 28 "Start" and the disconnecting contact 4 of the stop switch of the start of the reverse, shunted respectively by the first closing 7 and disconnecting 21 contacts, another output of the coil 13 of the first intermediate relay is connected to one of the contacts of the closing contact 3 of the starting switch of the reverse and closing contact 14, the other terminal of the coil 16 of the second intermediate relay is connected to one of the terminals of contacts 15 and 17, the other terminal of which is connected to one terminal of the opening contact 5

switch of the start of the reverse, another output of the coil 22 of the brake relay is connected to one terminal of the closing contact 1 of the limit switch of the end of the reverse and the closing contact 23, another terminal of the contact 1 is connected to one output of the closing contact 18 ”other terminals of the contacts 3.14.5, 1.7, 18 and 23 are combined and connected to another output of the power source through parallel-connected closing contact 8 and disconnecting contact 2 of the reverse end limit stop switch, the other output of coil 25 is connected to another output of the power source through closing contact 9, another output of coil 26 is connected to another output of a power source through serially connected closing 19 and disconnecting 11 contacts, another output of coil 23 is connected to another output of a power source through serially connected closing contact 24 of a braking relay and closing contact 10, bypassed -.

five

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connected in series with the breaker 12 and the closing 20 contacts.

The device works as follows.

In the initial position, the limit switch of the end of the reverse is pressed, the limit switch of the beginning of the reverse is released (Fig. 2). When the button 28 "Start" is pressed, the coil 6 of the start-up relay is turned on, the closing contact 9 of which includes the coil -25 of the table forward movement mechanism. The dividing table of the machine moves forward. When moving the table, the end switch for the end of the reverse is turned off and the limit switch for the start of the reverse is turned on. But the circuit disconnecting contact 2 - closing contact- 20 tact 3 turns on the first intermediate relay, contact 15 preparing the inclusion of the second intermediate relay. Upon further movement of the table, the ground stop switch of the reverse start is turned off and the circuit is connected to pin 8, pin 5 — pin 15 turns on the second intermediate relay. When approaching the next division position, the end switch βθ of the end of the reverse is switched on again. Through the closing contact 18 of the relay with the coil 16 and the contact 1 of the limit switch for the end of the reverse, it turns on and becomes self-powered the brake relay with the coil 22, the contact 24 of which closes the circuit of the braking coil 27. The dividing table switches to reduced speed. When approaching the "Reverse" position, the path of the ₄ θ switch of the end of the reverse switch is turned off and the limit switch of the start of the reverse switches on again, which by its breaker contact 4 turns off the relay with coil 6, the closing contact 9

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which de-energizes the coil 25, and the break contact 11 turns on the coil 26 of the table reverse mechanism. There is a reverse of the dividing table and pressing it to the stop at a reduced speed. The bullet switch of the start of the reverse is turned off and the limit switch of the end of the reverse is switched on again. Coils 13,16,22,26,27 are disconnected. The scheme takes the initial position.

Thus, the introduction of a braking mechanism reduces the speed of movement of the table when approaching the “Reverse” position, which reduces dynamic forces and thus increases the reliability of the device.

Claims (1)

Claim A device for controlling the dividing table of the machine according to auth.St. No. 687486, in connection with the fact that, in order to increase reliability, a brake mechanism with a control winding, a relay, braking with two closing contacts, a start relay is equipped with a fourth closing and a second NC contact is introduced into it. , the second intermediate relay is supplied with the third and fourth closing contacts, the limit switch of the reverse end is supplied with the closing contact, the coil of the brake relay is connected to one terminal of the power source and the other terminal via serially connected contacts The contact terminal of the end-of-life stop switch and the third closing contact of the second intermediate relay, shunted by the first closing contact of the braking relay, are connected to the junction point of the softening contact of the track terminal of the end of the reverse and the second closing contact of the turn-on relay; United A second closing contact of the braking relay and a fourth closing contact of the on relay, joked in series by the second opening contact of the on relay and the fourth closing contact of the second intermediate relay. 1488893 Positions FIG. 2 Iagts Lineics with stops '