SU779093A1 - Device for monitoring the operation of asbestos-concrete sheet-moulding machine - Google Patents

Description

The invention relates to the production of asbestos-cement sheet products.

A known device for monitoring,, the operation of an asbestos-cement molding machine, containing sensors of the thickness of the forming roll and the number of revolutions of the format drum connected to the inputs of the dividing device, a film thickness regulator connected via an actuator to the gate to supply the asbestos-cement mass to the bath [1],

The disadvantage of this device is the selection of the current value of the film thickness for each revolution of the format drum by dividing the signals from the sensors of the reel thickness and the number of revolutions of the format drum and adjusting the machine as a function of deviating this value from the set one, since during the forming process the first asbestos-cement at each subsequent layers -oborote aspect drum uplot- ⁱ nyayutsya and reduces its thickness, which does not distinguish the true thickness of the film layers in subsequent rolling.

There is also known a device for monitoring the operation of an asbestos-cement 'θ sheet-forming machine, comprising a first roll thickness sensor, sensors for the number of revolutions of the format drum and the start of a cut, a film thickness regulator with a film thickness adjuster, an actuator for the asbestos-cement mass feed gate, a cutter control unit, a measuring unit, a block shutdown, the first zero-organ and the adjuster of the run-up thickness, and the actuator of the asbestos-cement mass supply gate is connected to the output of the film thickness regulator, the input to orogo connected to the output of the measuring unit, one input of which is connected to the output breaker unit, a first sensor thickness reel is connected to one input of a first zero-body, the other input of which is connected with setpoint thickness overrun, and the output of the first ^zero-1 with the union of Body cos one input of the cutter control unit, the other inputs of which are connected to the sensors of the number of revolutions of the format drum 9 and the beginning of the cut [2].

This device allows you to automate the operation of cutting the formed run-off (sheet) and to regulate the molding process.

However, this' device isolation film thicknesses produced once per reel (average film thickness ^ which also does not allow to obtain high accuracy measurement of current zna ^g ** ^ onyya film thickness, especially in transient modes, and hence, high quality of the molding process and high quality of manufactured products.

The purpose of the invention is improving the quality of manufactured products.

The goal is achieved because a device for monitoring the operation of an asbestos-cement sheet-forming machine, containing a first roll thickness sensor, sensors for the number of revolutions of the format drum and the beginning of the cut, a “thickness control” with a film thickness adjuster, an actuator for supplying asbestos-cement mass, cutter control unit, measuring unit, switch-off unit, first.null-element and adjuster for the thickness of the run-up, and the actuating mechanism of the asbestos-cement supply of the mass is connected to the output of the regulator film thickness torus, the input of which is connected ........ with the output of the measuring unit, ------- one of the inputs of which is connected to the output of the shutdown unit, the first roll thickness sensor is connected to one of the inputs of the first zero -organ, the other `` '' input of which is connected to the slider of the roll thickness, and the output of the first null-organ is connected to one input of the cutter control unit, the other inputs of which are connected to the chick 15 of the beginning of the cut, cutter 16, shutdown block 17, measuring block 18, film thickness controller 19 , setter 20 film thickness, executive of the mechanism 21.

The device operates as follows. .

During the operation of the molding machine, the asbestos-cement mass is supplied from the mixer 1 to the bath 2. The amount of incoming mass is determined by the position of the gate 3.

The asbestos-cement mass in the bath 2 is filtered on a mesh cylinder 4, from which the resulting film is transferred to a moving cloth 5. From the cloth, the film is wound onto a format drum 6.

Formable run-up is measured by the first run-off thickness sensor 7. And the second run-off thickness sensor 8. The signal from the sensor 7 is fed to the first inputs of the comparison element 9 and the second zero-organ 10, the second inputs of which receive the signal from the sensor 8. 'Since the formable wire is measured first by the sensor 8, and then by the sensor 7, the voltage and the sensors are shifted to time (Fig. 2), the output of the comparison unit 9 appears voltage and ^ Fig. 2), · defined. voltage difference and LL. and at the output of the second null-organ 10 voltage pulses Ujy (Fig. 2), the duration of which is determined by the intervals of voltage inequality

The signal from the first sensor 7 of the coasting thickness is also fed to one of the inputs of the first zero-organ 11, the second input of which receives a signal from the setter 12 of the coasting thickness. When the signals coincide, the first zero is from the first sensor 7 of the reel thickness and the setter 12 of the reel thickness, the body 11 generates a signal that is fed to one of the inputs of the cutter control unit 13 (curve (J ^ g of Fig. 2). To the other two inputs of this the unit receives signals from the sensor 14 of the number of revolutions of the format drum and the sensor 15 of the beginning of the cut (curves U _i7 and Fig. 2). When the signal from the first null organ 11 and the sensor 15 of the beginning of the cut coincides, the control section 13 of the cutter sends a signal to the run-off cutter 16 ( curve u ^ dfig. 2). In the process of cutting off the coast, when passing d55 .ney reel at a first edge 7 datch'ikom nakataposledny thickness produces a zero signal, which otklyuchaet'pervy zero body 11. However, disabling unit 13 and to a srezchy7 16 occurs after the start of the next slice pulse from the sensor 14 of the sliding rborotov drum.

The voltage pulses from the output of the second zero-organ 10 are supplied to one of the inputs of the shutdown unit 17.

f · to.

with sensors for the speed of the “drum” drum and the beginning of the cut, it is equipped with a second roll thickness sensor, a second null organ and a comparison element, moreover, one input of the second null -> organ and the comparison element is connected to the first roll thickness sensor, and other inputs - to the second sensor of 'n'at thickness, the output of the second null organ is connected to one input of the shutdown unit, the other inputs of which are connected to the output of the cutter control unit and the cut-off start sensor, and the other input of the measuring unit is connected to the output of the compare element Eden.

In FIG. 1 is a block diagram of a device for monitoring the operation of an asbestos cement sheet forming machine; in FIG. 2 - voltage diagrams at the outputs of individual units of the device. ' The device consists of a mixer 1, bath 2, a gate 3 for supplying asbestos-cement mass into the bath of the mesh cylinder 4, cloth 5, a format drum 6, a first roll thickness gauge 7, a second gauge 8 of thickness of gQ kat, a comparison element 9, and a second. null organ 10, the first null organ 11 ,.

. the setter 12 of the run-up thickness, the cutter control unit 13, the sensor 14 of the number of rotations of the format drum, dates ...> ________ to the other two inputs of which signals from the output of the cutter control unit 13 and the cutoff start sensor 15 are supplied. When the voltage U * coincides with the output of the second zero-organ 10 and ⁱ⁵ pulses from the cut-off sensor 15, the shutdown unit 17 includes a measuring unit 18, to the second (measuring) input of which a signal is output from the output of the comparison unit 9 (curve of Fig. 2), The pulse width of the measuring unit is determined by the pulse duration from the output of the second null-organ 10. The signal from the output of the cutter control unit 13 blocks the inclusion of block 17.

Thus, in the process of forming the run-up, the measuring unit 18 is connected for measurement only at those intervals when the signal is proportional to the output of the comparison unit 9; the difference between the thicknesses of the formed roll, measured by the sensor 8 and formed, measured by the Sensor · 7, i.e., the thickness of the wound film. In the process of cutting the coast, when under the sensor 8 there is a fully formed coast, and under the sensor 7 there is a clean drum ₍ i.e., at the output of the comparison unit 9, the signal is proportional to the thickness of the coast, block 17 is not turned on, and measurement is not performed.

The reochord of the measuring unit .18 is a rheostat sensor for the film thickness controller 19. Since the measuring unit 18 is turned on for measurement only at intervals when the output of the comparison unit 9, the signal is proportional to the thickness. of the winded film, with the exception of the period of time when the last film is formed on the coast, and the rest of the formation time is turned off, the position of the carriage of the measuring unit 18 is determined by the value. the current thickness of each film (with the exception of the last on the roll). The measured thickness value of the penultimate film is stored by block 18 until the thickness of the first film is measured in the next run.

In the osu film thickness adjuster 19, a comparison is made of the current value of the film thickness with a predetermined, determined by the setter 20 of the film thickness, and if there is a mismatch

2 ^

3?

between them, the control signal is worked out to turn on the actuator 21 of changing the position of the gate 3 in the direction I of eliminating the inconsistency.

Claims (2)

(54) DEVICE TO CONTROL THE WORK OF THE ASBESTOCEMENT LEAF SHAPING MACHINE The invention relates to the production of asbestos-cement sheet products. A device for controlling the operation of an asbestos-cement molding machine is known, which contains sensors for the thickness of the forming roll and the number of revolutions of the format drum connected to the inputs of the dividing device, a film thickness controller connected through an actuator to the gate of the asbestos-cement mass in the bath 1. The disadvantage of this device is the selection of the current value of the film thickness for each revolution of the format. drum by dividing the signals from the sensors thickness of the roll and the number of revolutions of the format drum and adjusting the machine to the function of deviating this value from the given one, because during the formation of the overrun, the first asbestos-cement layers in the coil are compacted with each subsequent rotation of the format drum and reduce their TO.The thickness of the true drum is not allowed in the subsequent layers x reel It is also known a device for MONITORING the operation of an asbestos-cement sheet-forming machine, which contains the first roll thickness sensor, the number of revolutions of the format-6g6 drum and the beginning of the shear, adjusting the film thickness film thickness, asbestos-cement feed actuator, chopper control unit, measure the power unit, switch-off unit, first zero-organ and sensor current overhang, and the asbestos cement mass actuator is connected to the output of the film thickness regulator, input which is connected to the output of the measuring unit, one of the inputs of which is connected to the output of the shutdown unit, the first gauge of the overrun thickness is connected to one of the inputs of the first zero-body, the other input of which is connected to an addendum of the thickness of the overrun, and the output of the first null-organ is connected to one input of the shear control unit, the other inputs of which are connected to the rotational speed sensors 4; molding. However, in this film thickness, the film thickness is performed once per roll (average film thickness: THAT also does not allow you to obtain the highest accuracy of measurement of the current 4effli film size, especially in transition modes, and consequently, the high quality of the molding process and the high quality of fabrication The purpose of the invention is to improve the quality of the products to be manufactured. The aim is to achieve a device for monitoring the operation of an asbestos cement sheet-making machine, which contains the first thick gauge sensor kata j sensors of the speed of the format drum and the beginning of the cut, ° cross; film thickness with the setting device; TV films, actuator of the asbestos-cement Madbbi feed gate, control unit for the shear cutter, from the measuring unit, the shutdown unit, the first body and the unit thickness control unit an overrun, the actuator of the asbestos-cement supply gate is connected to the output of the film thickness regulator, the input of which is connected to the output of the measuring unit, tfflHH from the inputs of which is connected to the output of the shutdown unit, the first sensor the thickness of the reel is connected to one of the inputs of the first zero-body, the other one in the SSSS is connected to the control unit. NSS, the forward exit, the output of the first zero of the body is connected to one input of the shear control unit, the other inputs are connected to speed sensors. the drum and the beginning of the cut, is equipped with the second gauge of the overrun thickness, the second zero-organ and the element compared to NIN, with some inputs of the second nullorgan and the comparison element connected to the first thickness gauge of the roll and other inputs to the second TbODi sensor of the reverse, the output of the second zero The organ is connected to one input of the shutdown unit, the other inputs of which are connected to the output of the shear control unit and the cut start sensor, and the other input of the measuring unit is connected to the output of the reference element. FIG. 1 shows a block diagram of an apparatus for controlling the operation of an asbestos cement sheet-forming machine; in FIG. 2 - voltage plots at the outputs of individual units of the device .. The device consists of a mixer 1, a bath 2, a gate 3 supplying asbestos-cement mass to the bath of the mesh cylinder 4, cloth 5, a format drum 6, the first sensor 7 of the thickness of the nakti, the second sensor 8 of thickness on kata, reference element 9, null organ 10, first null organ 1. knob 12 thickness of the reel, block 1 Control shear, sensor la turns the format drum, date.,. :. f „:::. The cutter start 15, the cutter 16, the shutdown unit 17, measure the unit block 18, the film thickness controller 19, the film thickness adjuster 20, the actuator 21. The device operates as follows. During the operation of the molding machine, the asbestos-cement mass is fed from the mixer 1 into the bath 2. The amount of the incoming mass is determined by the position of the gate 3. The asbestos-cement mass 2 is filtered on the mesh cylinder 4, from which the resulting film is transferred to the moving cloth 5. The felt film is wound on the format drum 6. The formed roll is measured by the first gauge 7. of the roll thickness and the second gauge 8 of the roll thickness. The signal from sensor 7 is fed to the first inputs of the element of comparison 9 and the second zero-body 10, the second inputs of which are received from the sensor 84. Because the moldable roll is measured first by sensor 8 and then sensor 7, the voltage (-.2 . And sensors are shifted in time (Fig. 2). At the output of the comparison block 9, a voltage appears ((Fig 2) - determined by the voltage difference and U, j, and at the output of the second zero body 10 pulses voltage (Fig. 2), the duration of which is determined by the voltage inequality intervals ,, 5. The signal from the first sensor 7 thickness 11 and the second input of which receives a signal from the rebound thickness adjuster 12. When the signals coincide, from the first encoder 7 of the rebound thickness and the adjuster 12, the first zero The organ 11 generates a signal arriving at one of the inputs of the cutter control unit 13 (U curve, Fig. 2). The other two inputs of this block receive signals from the sensor 14 for the speed of the format drum and the cutoff sensor 15 (curves and FIG. 2). When the signal from the first nullorgan 11 and the cutoff start sensor 15 coincides, the shear control 13 controls the signal to the forward cutter 16 (curve 2). In the process of cutting the roll, when passing the rear edge of the roll under the first sensor 7, the thickness of the roll. the latter produces a zero signal, which disconnects the first null-organ 11. However, block 13 and the cutter 7 and a 16 are disconnected by the next post-slice pulse from the sensor 14 of the number of turns of the format drum, voltage pulses Uj from the output of the second zero-organ 10 are sent to one from the inputs of the block 17 off. The other two inputs of which are fed from the output of the control unit 13 by the cutter and the cutoff start sensor 15. If the voltage U, j coincides. from the output of the second zero-body 10 and the pulses from the cut-off sensor 15, the switch-off unit 17 turns on the measuring unit 18, the second (measuring) input of which receives a signal from the output of the comparison block 9 (curve 2); the duration of the pulses U2.5 of the output of the second null organ 1. The signal from the output of the cutter control unit 13. blocks the switching on of block 17. Thus, during the forming process, measuring unit 18 is connected to measure only during those time periods and at the output of the comparison unit 9, the signal is proportional to 1: the difference in thickness between the formable roll formed by the sensor 8 and molded by the sensor 7, i.e., the thickness of the roll film. In the process of cutting a roll, when under the sensor 8 there is a fully formed roll, and under the sensor 7, clean drums, that is, at the output of the comparison block 9, the signal is proportional to the thickness of the roll, block 17 does not turn on, and no measurement is made. The measuring tube reohord .18 is a resistance sensor for the film thickness regulator 19. Since measuring unit 18 is turned on for measurement only during periods when the output of comparator unit 9 is proportional to the thickness of the film being rolled, except for the time when the last roll is formed in the run-in film, and the rest of the forming time is turned off. block 18 is determined by the value of the current thickness of each film (except for the last one at a time). The measured value of the thickness of the penultimate film is retained at a block of 18 cm until the thickness of the first film is measured in the next roll. In the film thickness controller 19, the current value of the film thickness is compared with the predetermined thickness setting unit 20 and, if there is a mismatch between them, the control signal is triggered to turn on the actuator 21 for changing the position of the gate 3. side of the elimination of the resulting mismatch. Claims device for controlling the operation of an asbestos-cement sheet-forming machine, comprising the first gauge of the forging thickness, the sensors for the rotation speed of the format drum and the start of the cut, the film thickness controller with the film thickness adjuster, the actuator of the asbestos cement spreading unit, the shear control unit, the measuring unit , block off, first null organ and. an overlap thickness sensor, the actuator of the asbestos-cement mass supply gate is connected to the output of the film thickness regulator, the input of which is connected to the output of the measuring unit, one of the inputs of which is connected to the output of the shutdown unit, the first sensor of the thickness of the overhang is connected to one of the inputs of the first null organ , the other input of which is connected to the setup gauge of the overrun, the output of the first null organ is connected to one input of the shear control unit, the other inputs of which are connected to the speed sensors format th slice of the drum and the beginning of t n and h and w o f e c. so that, in order to improve the quality of manufactured products, it is equipped with a second gauge of gauge thickness, a second null organ and a comparison element, with some inputs of the second null organ and a comparison element being connected to the first gauge of thickness of the knurling, and other inputs to the second The overrun thickness sensor, the output of the second nullorgan, is connected to one input of the shutdown unit, the other inputs of which are connected to the output of the shear control unit and the cut start sensor, and the other input of the measuring unit is connected to the output of the reference element. Sources of information taken into account in the examination 1. Authors Witness of Soviet Union 402465, cl. B 28 B 21/00, 1972. 2. Author's certificate of the USSR according to Article No. 2432257, cl. In 28B 21/00, 1976.