SU771030A1 - Device for glass web production process control in vertical drawing shaft - Google Patents

Description

one

The invention relates to devices for controlling the production of glass ribbon.

A device for controlling the process of vertical stretching of a glass ribbon, a sensor and a temperature setter, a tachogenerator, an adder, an amplifier and a regulator 1 is known. This device does not allow controlling the generation of cracks in the 10th glass.

Another device is known for controlling the process of producing a ribbon of glass in a shaft of vertical stretching, comprising a system for detecting cracks in the ribbon of glass and an actuator for the first pair of rolls 2.

This device allows you to control the appearance of cracks in the glass, but it does not make it possible to minimize the loss of glass caused by the propagation of a crack in the glass.

The purpose of the invention is to increase the yield of useful products.

This is achieved by the fact that the device for controlling the process of producing a ribbon of glass in a vertical stretching shaft, containing a system for detecting: a crack in the glass ribbon and an actuator of the first pair

rolls, equipped with a crack downward velocity measurement circuit, a crack height detection circuit with a shaft, a threshold element and an OR logic element, the outputs of the crack detection system are connected to the downstream crack speed measurement circuit inputs and a mine output circuit measuring the velocity of crack propagation down through the threshold element is connected to one of the inputs of the OR logic element, to the other input of which is connected the output of the circuit ation of the positions of a crack shaft, and the output of the OR gate is connected to the actuator of the first pair of rollers.

The drawing shows a functional diagram of the device for controlling the production of a ribbon of glass.

Claims (2)

The device contains a system for detecting cracks in a glass ribbon 2, a scheme 3 measuring the speed of propagation of a crack downwards, a scheme 4 for determining the position of cracks along the height of a shaft, a threshold element 5, the trigger threshold of which is set by setting device 6, logical element OR 7, actuator 8. the first roll of the rolls 9. The crack detection system 1 may include cameras 10-13 installed at different levels along the height of the vertical extracting shaft, / or, and connectors 14-17 connected to their outputs, selection of the useful signal Number of cameras, and accordingly the selection is selected depending on the required accuracy of fixing the position of the crack along the height of the shaft and the angle of view of the camera lens. Measurement circuit 3 for the velocity of propagation of a crack downwards may contain time slot measurement circuits 18, 19, and 20, circuits 21, 22, and 23, the division and unit 24 of the distance between the cameras. The crack height detection circuit .4 may include triggers, 25-28, and coincidence circuit 29. The described device operates as follows. Under normal conditions, when there are no cracks in glass 2, cameras 10–13 transmit an image of a whole ribbon of glass at different levels and signals at the outlets of the selection schemes 14–17 are absent. In this case, the first pair of rolls 9 does not contact the glass ribbon 2. When a crack appears in the field of view of the upper camera 10, the selection circuit 14 connected in series with it generates a single signal indicating the appearance of a crack at a given level. This signal from the output of the selection circuit 14 is fed to one of the inputs of the circuit 3 measuring the velocity of propagation of the crack downwards and to one of the inputs of the circuit 4 for determining the height of the crack. In scheme 3, the signal about the occurrence of a crack arrives at the start input of the time interval measurement circuit 18, which starts on account of the length of the crack passing the distance between the cameras 10 and 11. In scheme 4. the signal of the appearance of a crack enters the trigger input 5 it in a single state. When the crack propagates down the shaft, the camera 11 after some time fixes its appearance at the next level, and the selection circuit 15 outputs a single signal to circuits 3 and 4. In the circuit 3, the output signal of the selection circuit 1 is fed to the start input of the timing circuit 18, stopping, by the same time, the countdown of the duration of the passage of a crack by the distance between the cameras 10 to 11., and the start input of circuit 19, n, which in turn begins the countdown of the duration of the passage of the distance between the cameras 11 and 12 by the crack. Hema 18 a signal proportional to the duration of passage of the crack distance between tele measures 10 and 11 is supplied to one input of dividing circuit 21, the second input of which receives the signal 24 base setpoint distances between the cameras. The circuit 21 divides the signal of the setter 24 by the signal of the circuit 18 and outputs a signal proportional to the speed of the base distance between the cracks of the cameras 10 and 11 to the input of the threshold element 5. If the speed of propagation of the crack downwards is more than the maximum permissible element 5, set by the setting device 6), then the threshold element 5 generates a single signal on one of the inputs of the logic element OR. At the same time, the signal of the selection scheme 15 is flung; trigger 26 in one state. If the crack continues to propagate downwards, it is successively fixed by cameras 12 and 13. When the crack reaches the maximum allowable level recorded by camera 13, the corresponding selection circuit 17 outputs a signal to the step input of the time interval measurement circuit 20 and trigger 28. the trigger 28 all the triggers (25-28) are in a single state and the coincidence circuit 29 outputs a single signal to the second input of the OR gate. The logical element OR, when a single signal (from logic element 5 or a matching circuit 29) arrives at its inputs, as well as if there are two single signals at its inputs, generates a control signal for switching on the actuator 8 of the first pair of rolls 9. Drive 8, presses the first pair of rolls 9 with a certain force to the glass ribbon 2, thereby eliminating the danger of the ribbon breaking. When the crack starts to rise, the signal at the output of the crack propagation speed measurement circuit 3 becomes obviously zero, and when the crack rises above the maximum allowable level, it becomes zero and the output signal of the circuit 4. At the input of the logic element OR, the signals from only zero level and drive 8 returns the first pair of rolls 9 to the original (diluted) position. The proposed solution makes it possible to increase the yield of glass due to the choice of the optimal moment of switching on the first pair of rolls, eliminating possible breaks in the stack tape due to the occurrence of a crack and minimizing the time that the first roll rolls contact the glass surface. Apparatus of the Invention for controlling the production of a ribbon of glass in a mine