SU1622470A1 - Method of automatic control of operation of moulding apparatus in board-making machine - Google Patents

Abstract

The invention relates to pulp and paper production and can be used in the preparation and clarified systems for water traps} For the second booster separator; 4WH1 paper pulp launchers on cardboard machines of various types. The purpose of the invention is to increase the stability of the concentration of paper pulp in the inlet device. The goal is achieved by measuring the overflow flow of the register water from collector 2 to the basin 6, in which the level 12 is monitored by means of a sensor. circulating water from pool 6 through valve 9, if the water level in pool 6 is higher than the set one, and when the water level in pool 6 is lower than the set one, regulate the flow of clarified water to the drop 8 through valve 11 The method makes it possible to stabilize the amount of registered water through the pump 3, which increases the stability of the concentration of paper pulp 1 or water w § 9 9 S J

Description

The invention relates to the pulp and paper industry and can be used in the preparation and chapuska systems of paper pulp on chip-making machines with various types of forming devices.

The purpose of the invention is to increase the stabilities of the paper pulp.

A block diagram of cncie iM, revising the method of automatically controlling the operation of the forming unit, is presented on the screen. t odelitelnoy machine (with .acuum-forming device).

The system has a vacuum-forming device 1, from which the registered water under the air supply of the mind is removed and P collector 2 of the registered water, a mixing pump 3, transferring the mass QM from the constant pressure tank (not shown), the diluted flow meter from collection 2 to the inlet device 1, flow meter 5, installed on the ii chip of the register water from collection 2 to pool 6 of excess water supply, oh / yes pump 7, excess water obuDOTnasi is fed to the mill-1OBPB iTC; isnbii i idle talk when using a machine without work or in Prek processing plants for tea breaks of cardboard sheet and low-pressure shower 8 low-pressure device through a regulating valve 9, pump 10, regulating peeler 11 installed on the supply line of clarified water supplied to the shower 8, level sensor 12 installed in pool 6, adjustable to a predetermined level determined by the minimum reserve of excess circulating water necessary for uninterrupted operation of the oasmolno preparatory department during normal operation and waste processing facilities cliffs of cardboard canvases, which is determined on the basis of calculating the balance of water and fiber per machine

The system contains a regulator 13 with an overflow flow setting knob, the first input of which is connected to the output of the flow meter 5, the second input - to the output of the 12 level sensor, the output - to the input of the regulating valve 9, the regulator 14 with the setting indicator of the overflow, the first input of which connected to the output of the flow meter 5, the second input is connected to the output of the 12 level sensor, and the output is from

the inlet of the control valve 11. The process line contains a suction scraper 15, a water separator 16 and a trough 17 for collecting the shower water.

The method is carried out as follows.

During operation of the cardboard machine, the flow meter 5 measures the overflow flow of the register water from collection 2

0 registered water in the pool 6 of excess circulating water. The signal from the sensor is fed to the controllers 13 and 14, where it is compared with the specified one. If the overflow flow is lower than the target, then

5 signal to change the water supply to the shower 8. Depending on the level monitored by the sensor 12 circulating water in the pool 6, the regulator 13 or 14 sends a signal to the control input of valve 9 or 11. The level of water in the pool 6 is not below the preset from the sensor 12 The level at the second input of the regulator 14 receives a command to regulate the water flow for the shower 8 by supplying clarified water. Regulator 14 VY5 gives a command to the input of a control valve that regulates the clarified water. Upon reaching the specified value of the flow of the overflow of registered water from collection 2 to the pool

0, the signals from the controllers 13 and 14 are disconnected to regulate the flow of water to the low pressure shower.

Claims (1)

By maintaining a stable amount of registered water entering the mixing pump 3, a stable concentration of paper pulp is achieved. The invention The method of automatic control of the operation of the forming device of the cardboard dividing machine by adjusting the supply of clarified water to the shower depending on the level in the pool of excess circulating water coming from a predetermined level of the register collector 5 water, characterized in that, in order to increase the stability of the paper pulp concentration, the flow rate of the register water overflow into the pool is additionally measured and, if its value is lower than the preset, regulate the flow of excess circulating water to the shower if the water level is higher than the preset value , and at the water level in the pool below the preset, adjust the flow of clarified 5 water.