SU422202A1 - Unit for plastic moulding of bilayer articles - Google Patents

Description

Union of Soviet * Socialist Republics

State Committee

USSR for inventions and discoveries

DESCRIPTION OF THE INVENTION

TO AUTHOR'S CERTIFICATE (61) Additional to author. certificate-wu - (22) Declared May 25, 71 (21) 1654696 / 29-33 with the addition of application No. - (23) Priority

Posted on 03/23/01. Bulletin No. 11

Date of publication of the description 23.0 3.81 <11422202 (51) M. Cl

B 28 B 3/22 (53) UDC € bb.z.

.022.82 (088.8) (72) Authors of the invention (71) Applicant

A.G. Wiegandt, D.G. Ilyin, V.M. Shinkarenko and A.V. Yugai

All-Union Research Institute for Machines for the Building Materials Industry _____ -. ___________________ (54) PLANT FOR PLASTIC FORMATION OF TWO-LAYERED PRODUCTS ‘the invention relates to the production of Building materials.

A known installation for the plastic molding of two-layer products including a screw press with a common head for the main and facing masses, a cutting machine, an auxiliary screw and a doeator-feeder for the facing mass, the electric drives of which are connected to the main power source, as well as a synchronizing device.

The purpose of the invention is the provision of synchronized operation of all installation mechanisms with the movement of brus-15 sa and the optimal thickness of the facing layer.

This is achieved by the fact that the synchronizing device is equipped with a potentiometer connected to a voltage source 20, and a pulse converter made in the form of a transistor standby multivibrator with positive feedback, the e * v! Ter-baea transistor circuit of the second stage of which is connected to one arm of the potentiometer and the second arm of the potentiometer is shunted by a potential-limiting chain containing a semiconductor diode. thirty

The transition of the emitter-collector of the transistor of the first stage of the pulse converter is shunted by a silicon stabilizing diode.

The drawing shows a block diagram of the proposed installation for plastic molding of two-layer products.

The installation consists of a screw press 1 with a common head for the main and facing masses, an auxiliary screw 2 with an electric motor 3, a batcher-feeder 4 for the facing mass ~ with an electric motor 5, a cutting machine 6 with an electric motor 7 and a tachogenerator 8, a measuring conveyor 9 s installed on it a pulse sensor 10 of the speed of movement of the clay beam, which is a gear disk 11, the teeth of which are included in the working gap of the inductive sensor 12, the synchronizing device .13 and the thyristor converter 14, itayuschego motors 3,5 and 7.

The synchronizing device consists of a shaper 15 that converts the pulses from the inductive sensor 12 into rectangular pulses, a pulse converter 3 of a 16 ”zootole having two inputs; starting, connected to the output of the shaper 15, and control, connected to the tachogenerator 8 of the potentiometer 17, one arm 18 of which is connected to the control input of the pulse converter 16, and the second arm 19 is shunted by a potential-limiting chain 20 containing a voltage source 21 and a silicon stabilizing diode 22, a comparison element 23 ,. comparing the duration of the pulses arriving at its inputs from the shaper 15 and the pulse converter 16, and the amplifier 24, the input of which is connected to the output of the comparing element 15 and 23, and the output to the thyristor converter 14.

The duration of the pulses at the output of the pulse converter 16 is inversely proportional to the voltage of the tacho-20 of the generator 8, and therefore, the rotation speed of the electric motor 7, the cutting machine and the electric motors 3 and 5 fed with the same voltage. This dependence 25 is performed with greater accuracy over the entire range changes in tachogenerator voltage 8.

Since the duration of the pulses at the output of the pulse sensor 10 with a constant tooth pitch of the gear disc 11 is also inversely proportional to the speed of the clay beam, the ratio of the pulse duration at the output of the shaper 15 and the pulse converter 16 characterizes the correspondence of the rotation speed of the electric motors 3, 5.7 the speed of the clay beam or deviation from it in one direction or another. 40 To set the required ratio of the rotational speeds of the dispenser-feeder 4, the auxiliary screw 2 and the cutting machine 6 during installation, use the setting 45 resistance-25 in the excitation winding circuits of electric motors 3,5 and 7. The installation works as follows.

The main clay mass and the facing simultaneously enter the head of the screw press 1. The latter is dosed by dispenser-feeder 4 and injected into the press head by an auxiliary screw 2. As a result, a bar with a facing layer comes out of the press head, which is cut into bricks by a cutting machine 6. To maintain an optimum thickness of the facing layer and a constant length of 60 cut-off bricks of the speed of electric motors 3 , 5 and 7 of the auxiliary screw, feeder-feeder and cutting machine are synchronized with the speed of movement of the clay beam by the synchronizing device 13.

When the speeds correspond to the outputs of the shaper 15 and the pulsed L-converter 16, pulses of the same duration are formed, and the signals at the outputs of the comparing element 23 and the amplifier 24 retain the value that was before, i.e. 0 or 1.

As a result, the voltage at the output of the thyristor converter 14 decreases or increases, and accordingly, the rotation speeds of electric motors 3,5 and 7 decrease or increase. As soon as the speed the rotation of engines 3,5 and 7 deviates from the set value determined by the speed of the beam, immediately there is a difference in the duration of the pulses received at the input of the comparative element 23. The latter changes its state to the opposite, which is always directed towards eliminating the resulting speed deviation.

So, for example, if the rotation speed of electric motors 3,5 and 7 becomes higher than the set one, the pulse duration at the output of the pulse converter 16 becomes less than the pulse duration at the output of the driver 15. As a result, the signal 0 appears at the outputs of the comparing device 23 and the amplifier 24, and the voltage the output of the thyristor converter begins to decline. The speeds of the motors 3,5 and 7 and the voltage of the tachogenerator also decrease. 8. The pulse duration at the output of the pulse converter 16 increases and, when it becomes longer than the pulse duration at the output of the driver 15, the comparing element 23 changes its state by supplying a signal to the thyristor converter through the amplifier 24 14. The voltage at its output begins to increase again. So, continuously working in vibration mode, the synchronizing device maintains compliance with the speeds of the engines

3,5 and 7 with the speed of the clay beam.

Claims (2)

. This invention relates to the production of building materials. A known device for plastic molding of two-layer products, comprising a screw press with a common head for the main and facing mass, a cutting machine, an auxiliary screw and a feeder for a facing mass, the electric drives of which are connected to a common power source, as well as a synchronizing device. The purpose of the invention is to ensure the synchronized operation of all the mechanisms of the installation with the movement of timber and the optimum thickness of the facing layer. This is achieved by the fact that the synchronizing device is equipped with a potentiometer attached to the voltage source and a pulse converter made in the form of a transistor standby multivibrator with positive feedback, the circuit of the emITitter-base of the transistor of the second stage is connected to one arm of the potentiometer, the second arm of the potentiometer is shunted by a potential-limiting circuit containing a semiconductor diode. Transition, the emitter-collector of the transistor of the first cascade of the pulse converter is shunted with a silicon stabilizing diode. The drawing shows a block diagram of the proposed installation for plastic molding of two-layer products. The plant consists of a screw press 1 with a common head for the main and facing mass, an auxiliary screw 2 with an electric motor 3, and a feeder dispenser 4 for a length of. facing mass with an electric motor 5, a cutting machine 6 with an electric motor 7 and a tachogenerator 8, a measuring conveyor 9 with a pulse sensor 10 mounted on it, the speed of movement of the clay bar, which is a gear disk 11, the tooth of which is included in the working gap of the inductive sensor 12, a synchronizing device .13 and a thyristor converter 14, supplying electric motors 3.5 and 7. The synchronizing device consists of a generator 15, which converts the pulses coming from the inductive sensor 12 into mpulsy rectangular shape, pulse preobrazoiatsl 16 imeyuschgo dvavhoda; start-up connected to the jii-jrt with the output of Forwarmer 15, and uglavlyuschy, connect; oche to the tachogenerator 8 potentiometer 17, one arm 18 of which is connected to the control input of the pulse converter 16, and the second arm 19 is bridged by a potential-limiting chain 20 containing 21 power source and silicon stabilizing diode 22, oraviva nivayuschego element 23 ,. The average duration of the pulses arriving at its inputs is from the generator 15 and the pulse converter 16, and the amplifier 24, whose input is connected to the output of the comparison element 23, and the output to the thyristor converter 14. The duration of the pulses at the output of the pulse converter 16 is inversely proportional to the voltage of the tachogenerator 8, and therefore, the speed of the motor 7, the automatic machine and powered by the same voltage of the electric motors 3 and 5. This dependence is more accurate in all the voltage variation range of the tachogenerator 8. Since the duration of the pulses at the output of the pulse sensor 10 at a constant pitch of the teeth of the gear disk 11 is also inversely proportional to the movement of the clay bar, the ratio of the pulse duration at the output of the imaging unit 15 and the pulse converter 16 characterizes the correspondence of the speed of rotation of the electric motor 3.5.7 to the speed of movement of the clay bar or deviation from it in one direction or another. For installation, in the process of setting the required ratio of the rotational speeds of the feeder-feeder 4, the auxiliary screw 2 and the cutting machine 6, serve-adjusting resistances -25 in the excitation windings of electric motors 3.5 and the Installation operates as follows. In the head of the screw press 1 at the same time the main clay is fed into the mass and facing. The latter is dosed by the dosing feeder 4 and is injected into the head of the press by an auxiliary screw. 2. As a result, a press comes out of the press head with a facing layer, which is cut into bricks by a cutting machine 6. To maintain the optimum thickness of the covering layer and a constant length of the bricks being cut, the rotation speed of the 3.5 and 7 auxiliary screw motors and the cutting machine are synchronized with the speed of movement of the clay beam by the synchronizing device 13. When the speeds at the outlets of the former 15 and the pulsed transformer 16 correspond, the pulses are formed the same duration, and the signals at the outputs of the comparing element 23 and amplifier 24 retain the value that was before, i.e. O or 1. As a result, the voltage at the output of the thyristor converter 14 decreases or increases, and the rotational speeds of the electric motors 3.5 and 7, respectively, decrease or increase. As soon as the rotational speeds of the motors 3.5 and 7 deviate from the set value determined by the speed movement of the beam, immediately there is a difference in the duration of the impulses arriving at the input of the comparing element 23. The latter changes its state by the opposite, which is always directed towards the elimination of the resulting deviation and speeds. So for example, if the rotational speed of electric motors 3.5 and 7 becomes higher than the set one, the pulse duration at the output of the pulse converter 16 becomes shorter than the pulse duration at the output of the shaper 15. As a result, at the outputs of the comparison device 23 and the amplifier 24 a signal O appears, and the voltage at the output of the thyristor converter begins to decrease. The speeds of the motors 3.5 and 7 and the voltage of the tachogenerator 8 also decrease. The duration of the pulses at the output of the pulse converter 16 increases and when it becomes longer than the duration of the pulses at the output of the shaper 15, the comparison element 23 changes its state by supplying a signal through the amplifier 24 to thyristor converter 14. The voltage at its output begins to increase again. Thus, continuously operating in the vibration mode, the synchronizing device maintains the correspondence of the speeds of engines 3.5 and 7 with the speed of movement of the clay beam. Claim 1. Installation for plastic molding of double-layer products, comprising a screw press with a common head for the main and facing masses, a cutting machine, an auxiliary screw and a dispenser feeder for the facing mass, the electric drives of which are connected to a common power source, as well as a synchronizing device featuring so that in order to ensure the synchronized operation of all mohants installations with movement of the beam and ensuring the optimal thickness of the cladding layer; the synchronizing device is equipped with a potentiometer connected to a voltage source, and a pulse converter made in the form of a transistor waiting multivibrator with positive feedback; the emitter-base circuit of the transistor of the second stage is connected to one shoulder potentiometer, and the second arm of the potentiometer is shunted by a potential-limiting circuit containing a semiconductor diode. 2, Installation under item 1, about tl and that the transition of the emitter collector of the transistor of the first cascade of the pulse converter is shunted by a silicon stabilizing diode.