SU1242404A1 - Indicator of presence of mouldings in injection-moulding machine - Google Patents

Description

The invention relates to general purpose indicator and recording instruments using magnetic signal transmission means and can be used in various fields of conglomeration, such as coke chemistry, to control the exit from the molding mask.

The aim of the invention is to improve the reliability of the machine by automating the control of the presence of molds.

The drawing shows a diagram of the indicator.

The mold availability indicator contains a permanent magnet 1 mounted on the outer end of a two-armed lever 2 mounted on a ball support 3 in the lid 4 of the molding machine 5. A plate is fixed on the inner end of the lever 2, on which the drop-down moldings hit. The magnet 1 (M) acts on a magneto-controlled contact 6 (herkop). At the output of the reed switch, control block 7 is turned on. The control unit 7 consists of a power supply unit 8, a thyristor controlled thyristor key and an executive relay. The titanium unit 8 includes diodes D1 and D2, resistors R1 and R2, and capacitors are electrical (filters C1 and C2. The thyristor key has two thyratron control circuits. The first circuit contains the thyratron L with the limiting resistor R3. The anode of the thyratron through the limiting resistor R3 is connected with the capacitor C4, the time of the driving circuit RC and the anode of the thyratron of the second control circuit. The cathode of the thyratron L is connected via a resistor R4 to the control electrode of the thyristor DZ. The grid of the thyratron is connected through a parallel voltage divider R5-R6 and - a row capacitor C3 and a magnetically controlled contact 6 is connected to the power supply unit 8. The second control circuit contains the thyratron L2, the anode of which is connected to the power supply unit BP and the magnetically controlled contact 6 through the limiting resistor R7 The DZ and the power supply unit 8, and the grid through the resistor R8 are connected to the capacitor C4, the time of the master circuit RC. The second lead of the capacitor C4 is connected to the anode of the thyristor DZ and the executive relay P1.

The indicator works as follows.

During normal operation of the molding machine molding, lunge out of the cells.

Compiled by V. Etingen

Editor V. IvanovaTechred I. VeresKorrektor E. Roshko

Order 3657/20 Circulation 597 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

hitting the plate of the lever 2, which causes its outer part to move. The magnetically controlled contact 6 is thus short-circuited. At the moments of the magnetically controlled contact, the capacitor C3 is charged and its potential reaches the magnitude of the ignition voltage of the thyratron L1. After ignition of the thyratron L1 by applying voltage to the control electrode, the thyristor DZ is turned on. Sr ° battles relay P1, which by its IPi contact closes the circuit of the signal lamp Ln1. Moldings fall out in 3-5 seconds. During the period of time between the fallouts of the molds, the Magnetically Controlled Contact 6 is opened, and the DZ thyristor remains on. The current flowing through the DZ thyristor is applied to the cathode of the thyratron L1 and quenches it until the next output of the molds, the closure of the magnetically controlled contact 6 and the charge of the capacitor C3. Capacitor C4 is also charged, but when the thyristor is turned on, it is constantly discharged through the L-1 tiratron flash.

If the output of the molds is disturbed, the permanent magnet i (M) does not change its position, the Magnetically controlled contact 6 also does not change its position and remains closed or open (depending on the position of the lever 2 at the moment of failure), the tiratron L1 will not light up Time of charge and discharge of capacitor C4

„Corresponds to the time between the two outlets of the moldings from the press molding machines. This time is experimentally determined for each mode of operation of the press machine and is within 3-5 seconds. In the absence of moldings

,; the capacitor C4 is charged until the ignition voltage of the L2 thyratron with a time delay of 3--5 s and then ignites the L2 thyratron. When a thyratron L2 is ignited, capacitor C4 recharges and turns off thyristor D4. The relay P1 is turned off and the contact .m 2P1 closes the circuit of the signal lamp Ln2, signaling violations of the output of the molds.

The use of the proposed device for controlling the presence of moldings of a molding machine will automate the process of control. Automation of the control, in turn, will make it possible to timely detect the failure of the molding machine and prevent an emergency situation.

Claims (1)

INDICATOR OF THE AVAILABILITY OF THE FORMES OF THE PRESS-FORMING MACHINE, comprising a magnetically-controlled contact interacting with a permanent magnet mounted on the outer end of the two-arm lever integrated in the cover of the molding machine, and a control unit, characterized in that, in order to increase the reliability of the machine by automation monitoring the presence of molds, the control unit is made in the form of a thyristor key with two thyratron control circuits connected to the power supply and an executive relay, the anode of the thyratron of the first circuit the control via a limiting resistor is connected to the capacitor of the RC timing circuit and the thyratron anode of the second control circuit, the thyratron cathode is connected through the resistor to the thyristor control electrode, and the grid is connected through a parallel voltage divider and capacitor and through a magnetically controlled contact to the power supply unit, the thyratron anode of the second control circuit through a limiting resistor connected to the power supply and a magnetically controlled contact, the cathode is connected to the power supply, and the grid through the resistor it is single to the thyratron anode, the anode limiting resistor, and the RC capacitor, the second output of the thyristor connected to the anode and the executive relay. SU „„ 1242404