SU937161A1 - Apparatus for controlling asbestos-cement moulding machine - Google Patents

Description

(54) DEVICE FOR REGULATING ASBESTOC-CELLING FORMING MACHINE

one

The invention relates to the building materials industry, in particular, to the production of asbestos-cement products.

Devices for adjusting the asbestos-cement molding machine, stabilizing film thickness 1, are known.

The closest to the invention in terms of technical drying is a device for adjusting an asbestos-cement molding machine, comprising a sensor and a film thickness adjuster, a regulator and a regulating body for feeding the mass with an actuator 2.

A disadvantage of the devices is the poor quality of the stabilization of the film thickness, associated with abrupt changes in the level of the ladle in the course of periodic 15 discharges of asbestos-cement mass from the mixer into it. In this case, strong disturbances arise in the control device due to the excessive mass consumption, which is created due to the full opening of the suber in the period prior to the mass draining, when the level in the ladle mixer is minimal. These disturbances increase the film thickness above a predetermined value. Transient in device

It does not allow to obtain good quality stabilization of the film thickness due to the significant inertia of the control object.

The purpose of the invention is to stabilize the film thickness.

Claims (2)

The goal is achieved by the fact that a device for controlling an asbestos-cement molding machine, comprising a sensor and a film thickness adjuster, a regulator and a regulating body for feeding the mass with an additional mechanism, is equipped with a threshold element, a logic element And and a sensor for mass draining into a drum mixer, which is connected to one from the inputs of the element I, the output of which is connected to one of the inputs of the regulator, the output of which is connected to the input of the threshold elec cient, the other input of AND gate through the series connected threshold element zadatchik- film thickness and is connected to another input of the regulator, and the film thickness sensor coupled to a corresponding input of the regulator. The drawing shows the device. The device includes a bucket mixer 1 with a scoop wheel 2 and a receiving box 3, a bath 4 of the mesh cylinder 5, a cloth 6, a format drum 7, a film thickness sensor 8, a setting device 9, a film thickness regulator 10, a mass regulating body consisting of the actuator 11 and Schiber 12, the sensor 13 drain mass, the threshold element 14 and the logical element And 15. The device operates as follows. During the operation of the molding mask, the mass from the bucket mixer 1 is fed by the scoop wheel 2 to the receiving box 3. The position of the gate 12 determines the required mass flow rate in accordance with a given unit 9 thickness of the film. If at the same time the mass level is bucket; The hanger 1 is high, the mass is supplied with a margin and its surplus from the receiving box 3 is drained back into the broom. Formed when filtering on the mesh cylinder 5 installed in the bath 4, the asbestos-cement film is transferred by cloth b to the format drum 7. Depending on the signal from the film thickness sensor 8, the regulator 10 is in the range determined by the installed film thickness adjuster 9 value, controls the actuator 11 of the shnber 12. During the molding of the products, the mass level in the ladle mixer is lowered. With a deep decrease in the level, when the buckets of the scooping wheel 2 are partially filled, in the receiving box 3 the volume of the mass is insufficient to maintain a given film thickness. The gate 12 starts to open according to the signal from the regulator 10 and, as soon as the degree of its opening exceeds the limit set by the threshold element 14 in accordance with the value set by the setting device 9, the threshold element 14 also triggers a signal at the first input of the logic element. At the next discharge of the mass from the mixer into the slinger 1 in the system for regulating the film thickness, due to the excessive opening of the gate 12, an unsatisfactory transient should occur, which would lead to a protrusion of poor-quality products. However, the transition process is smoothed as follows. From the sensor 13, the discharge mass on the logical element And 15 receives the second signal, which leads to its operation. At that, the controller 10 will receive a command to cover the spigot 12 until the threshold element 14 returns to the initial state. Thus, even before the level change in the bucket plate 1, the spider 12 is introduced into the zone corresponding to the specified value of the film thickness. Thus, the proposed device, due to the proactive (level change in the ladle stirrer) impact on the mass feed regulator, improves the transient process that occurs during regular draining of the mass, which significantly improves the quality of stabilization of the film thickness and, therefore, the quality of finished products . According to preliminary calculations, the proposed device will reduce the marriage on Yu, which will give an annual economic effect in the amount of 15 thousand rubles. Apparatus for controlling an asbestos-cement molding mask comprising a sensor and a film thickness adjuster, a regulator and a mass feed regulator with an actuator, characterized in that, in order to stabilize the film thickness, it is equipped with a threshold element, a logic element And and a mass drain sensor into the bucket mixer, which is connected to one of the inputs of the element I, the output of which is connected to one of the inputs of the regulator, the output of which is through the executive mechanism of the regulator odachi mass connected to the input threshold elemeyta, the other input of AND gate serially coupled through a threshold element, and the film thickness setting unit connected to Durga entry regulator, and the film thickness sensor coupled to a corresponding input of the regulator. Sources of information taken into account during the examination 1. USSR author's certificate No. 352981, cl. D 21 F 1/08, 1971. 2. USSR author's certificate number 391938, cl. 28/21/09 ,, 1971 (prototype).