Automatic control system for coating backflow of top roller of sizing machine

Abstract

The utility model discloses an automatic control system for coating backflow of a top roller of a sizing machine, which comprises a material preparation tank, a feeding pump, the sizing machine, a backflow tank and a material supply control center, and the feeding pump is used for pumping the coating stored in the material preparation tank to the feeding end of the sizing machine; a liquid level detection module which is electrically connected with the feeding control center and is used for detecting and feeding back a detected backflow coating liquid level signal to the feeding control center is arranged in the backflow tank; a material pumping variable frequency pump and a backflow filtering assembly are sequentially connected between the backflow tank and the material preparation tank through a pipeline; the material supply control center controls the material pumping variable frequency pump to adaptively adjust the rotating speed according to the height of the liquid level of the backflow paint in the backflow tank detected by the liquid level detection module, so that the liquid level of the backflow paint in the backflow tank is kept below a set liquid level and continuously pumped to a feeding hole of the backflow filtering assembly; through combined control of the material pumping variable frequency pump and the liquid level detection module, automatic control of backflow is achieved, cleaning and personnel maintenance are reduced, and the production efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technology of coating backflow control in glue applying machine, especially relates to a kind of automatic control system for glue applying machine top roller coating backflow. BACKGROUND

[0002] In papermaking industry, glue applying machine mainly uniformly applies glue coating on paper surface by pneumatic pressurization, to enhance the anti-permeability and diffusion resistance of paper to water solution;Its working principle is to make glue coating uniformly penetrate to the surface of paper by pneumatic pressurization, so as to improve the surface strength of paper and prevent liquid penetration.

[0003] Therefore, in paper processing, whether the glue coating of glue applying machine is clean directly affects the cleanliness of processed paper surface;In the process of surface sizing of paper, in order to ensure that glue coating uniformly penetrates to the entire paper surface, glue solution coating is often used in excess, which will cause that, in order to fully utilize glue solution coating, glue solution coating recycled after glue applying machine is filtered by vibrating screen and then directly returned to material preparation tank, and mixed with fresh glue solution coating and then transported to glue applying machine for sizing again;This sizing process is collectively referred to as coating backflow of glue applying machine in papermaking industry.

[0004] In the coating backflow process of glue applying machine, since the backflow coating contains impurities, the screen used for filtering is often blocked and needs to be cleaned or the screen is damaged and needs to be replaced after long-term use, which not only wastes a lot of time and affects production, but also has safety hazards when the screen is cleaned or replaced;At the same time, when these problems are handled, the filtering device needs to be opened to bypass, which cannot normally filter, affects the quality of coating and further affects the quality of paper. UTILITY MODEL CONTENTS

[0005] The automatic control system for glue applying machine top roller coating backflow provided by the utility model realizes automatic control of backflow, reduces cleaning and personnel maintenance, and effectively improves production efficiency, production efficiency and production quality of paper.

[0006] The utility model adopts the technical scheme to solve the technical problems:

[0007] An automatic control system for glue applying machine top roller coating backflow, comprising a material preparation tank, a feeding pump, a glue applying machine, a backflow tank and a feeding control center, the material preparation tank, the feeding pump, the glue applying machine and the backflow tank are connected in sequence by pipelines, the feeding pump is used to pump the coating stored in the material preparation tank to the feeding end of the glue applying machine, and the backflow tank is used to collect backflow coating after the top roller of the glue applying machine finishes coating paper;

[0008] The backflow tank is provided with a liquid level detection module electrically connected with the feeding control center and used for detecting and feeding back the detected backflow coating liquid level signal to the feeding control center;

[0009] The backflow tank and the standby tank are further connected with a material pumping variable frequency pump and a backflow filtering assembly in sequence through pipelines, the feeding control center is in electrical signal connection with the material pumping variable frequency pump and controls the pumping rotating speed of the material pumping variable frequency pump, and the feeding control center controls the self-adaptive rotating speed adjustment of the material pumping variable frequency pump according to the backflow coating liquid level of the backflow tank detected by the liquid level detection module, so that the backflow coating liquid level in the backflow tank is continuously pumped to the inlet of the backflow filtering assembly at a set liquid level.

[0010] The backflow filtering assembly is used for filtering and separating the filtrate of the backflow coating after impurities such as large-diameter and clustered colloidal particles or clustered paper hairs in the backflow coating are filtered out, and directly returning the filtrate to the standby tank.

[0011] Preferably, the backflow filtering assembly is at least two parallelly installed filters arranged between the material pumping variable frequency pump and the standby tank and used for filtering and removing impurities from the backflow coating in multiple shunt ways.

[0012] Preferably, the set liquid level detected by the liquid level detection module in the backflow tank is that the backflow coating liquid level is kept at 35% of the total liquid level measurement value of the backflow tank, when the liquid level measurement value of the backflow tank in the backflow tank detected by the liquid level detection module exceeds 35%, the feeding control center controls the rotating speed of the material pumping variable frequency pump to increase and accelerate the backflow coating in the backflow tank to be discharged, and when the liquid level measurement value of the backflow tank in the backflow tank detected by the liquid level detection module is lower than 35%, the feeding control center controls the rotating speed of the material pumping variable frequency pump to decrease and slow down the backflow coating in the backflow tank to be discharged, so as to keep the automatic balance of the coating returned to the backflow tank by the top roller of the sizing machine and the coating pumped to the standby tank by the material pumping variable frequency pump.

[0013] The utility model discloses the beneficial effect is:

[0014] Through the feeding control center, the rotating speed of the material pumping variable frequency pump is self-adaptively adjusted according to the backflow coating liquid level of the backflow tank detected by the liquid level detection module, the backflow coating liquid level in the backflow tank is continuously pumped to the inlet of the backflow filtering assembly at a set liquid level, the joint control of the material pumping variable frequency pump and the liquid level detection module is realized, manual intervention operation in paper production is avoided, the coating backflow problem of the paper sizing machine is effectively handled, the backflow coating flow is continuously and automatically controlled, continuous and uninterrupted filtration is realized, the backflow is automatically controlled, cleaning and personnel maintenance are reduced, manual operation can be greatly reduced, and production efficiency can be effectively improved.

[0015] Moreover, the bypass needs to be opened for maintenance of the existing filter device, the filter device cannot normally filter, the paint quality is affected, and then the paper quality is affected; in the embodiment, the reflux filter assembly adopts at least two filters installed in parallel, when one filter is maintained, the other filters can still normally work, the safety hidden danger during cleaning of the screen is avoided, and the smooth progress of the production process is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a system principle schematic diagram of the utility model. DETAILED DESCRIPTION

[0017] The technical scheme in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model, and it shall be explained that, in the case of no conflict, the embodiments and the features in the embodiments in the utility model can be combined with each other. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0018] In the description of the utility model, it shall be explained that, unless another explicit provision and limitation, the terms 'installation', 'connection', 'connection' should be broad sense, for example, can be fixed connection, can be detachable connection, or integrally connected, can be mechanical connection, can be electrical connection, can be directly connected, can be indirectly connected through intermediate medium, can be the communication inside two elements. For the ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood through specific circumstances.

[0019] An automatic control system for top roller coating reflux of a size press, as shown in Figure 1 The size press 3, the reflux tank 4 and the feed control center 5 are sequentially connected through pipelines, the feeding pump 2 is used to pump the paint stored in the standby tank 1 to the feeding end of the size press 3, and the reflux tank 4 is used to collect the reflux paint after the top roller of the size press 3 finishes coating paper; the reflux tank 4 is provided with a liquid level detection module 6 electrically connected with the feed control center 5, used for detecting and feeding the detected reflux paint liquid level signal to the feed control center 5; the reflux tank 4 and the standby tank 1 are further sequentially connected with a material pumping frequency conversion pump 7 and a reflux filter assembly 8 through pipelines.

[0020] In operation, the supply control center 5 is in electrical signal connection with the pumping variable frequency pump 7 and controls the pumping speed of the pumping variable frequency pump 7, the supply control center 5 controls the pumping variable frequency pump 7 to adjust the speed automatically according to the backflow coating liquid level in the backflow tank 4 detected by the liquid level detection module 6, and keeps the backflow coating liquid level in the backflow tank 4 at a set level and continuously pumps to the inlet of the backflow filtering assembly 8, and the backflow filtering assembly 8 is used to filter and separate the filtrate after the impurities such as large-diameter and clustered colloidal particles or clustered paper hairs in the backflow coating from the inlet of the backflow filtering assembly 8 to the standby tank 1.

[0021] In this embodiment, the set level of the backflow coating liquid level detected by the liquid level detection module 6 in the backflow tank 4 is kept at 35% of the total liquid level measurement value of the backflow tank 4, when the liquid level detection module 6 detects that the backflow tank 4 liquid level measurement value in the backflow tank 4 exceeds 35%, the supply control center 5 controls the speed of the pumping variable frequency pump 7 to increase to speed up the backflow coating in the backflow tank 4, when the liquid level detection module 6 detects that the backflow tank 4 liquid level measurement value in the backflow tank 4 is lower than 35%, the supply control center 5 controls the speed of the pumping variable frequency pump 7 to reduce to slow down the backflow coating in the backflow tank 4, to keep the automatic balance of the coating from the top roller of the sizing machine 3 backflowing to the backflow tank 4 and the coating pumped by the pumping variable frequency pump 7 to the standby tank 1, to realize the automatic control of the production process, to reduce the active intervention of personnel, to reduce cleaning and personnel maintenance, and to effectively improve the production efficiency.

[0022] In this embodiment, the backflow filtering assembly 8 adopts two parallelly installed filters 80 arranged between the pumping variable frequency pump 7 and the standby tank 1 and used for filtering and removing impurities in the backflow coating, when the screen of one filter 80 is blocked or damaged and needs to be repaired and maintained, the other filter 80 can still work normally and will not affect the coating quality, to ensure the smooth progress of the production process.

[0023] In use, through the joint control of the pumping variable frequency pump 7 and the liquid level detection module 6, the supply control center 5 controls the pumping variable frequency pump 7 to adjust the speed automatically according to the backflow coating liquid level in the backflow tank 4 detected by the liquid level detection module 6, and keeps the backflow coating liquid level in the backflow tank 4 at a set level and continuously pumps to the inlet of the backflow filtering assembly 8, to avoid manual intervention operation in papermaking production, to effectively handle the coating backflow problem of the paper sizing machine 3, to realize continuous automatic control of the backflow coating flow, continuous and uninterrupted filtering, and automatic control of the backflow.

[0024] The above-described embodiments are only preferred embodiments of the present application, and do not limit the implementation range of the present application, and equivalent changes made according to the shape, structure and principle of the present application should be covered in the protection scope of the present application.

Claims

1. An automated control system for top roll coating backflow of a size press, characterized by, The application relates to a glue supply system, which comprises a glue preparation tank, a glue feeding pump, a glue applicator, a glue return tank and a glue supply control center, wherein the glue preparation tank, the glue feeding pump, the glue applicator and the glue return tank are sequentially connected through pipelines; the glue feeding pump is used for pumping the paint stored in the glue preparation tank to the feeding end of the glue applicator; the glue return tank is used for collecting the return paint after the top roller of the glue applicator finishes coating paper. The glue return tank is provided with a liquid level detection module which is electrically connected with the glue supply control center and is used for detecting and feeding the detected return paint liquid level signal to the glue supply control center. The glue return tank and the glue preparation tank are further sequentially connected through pipelines with a glue pumping variable frequency pump and a glue return filtering assembly; the glue supply control center is electrically connected with the glue pumping variable frequency pump and controls the pumping rotating speed of the glue pumping variable frequency pump; the glue supply control center controls the self-adaptive rotating speed adjustment of the glue pumping variable frequency pump according to the return paint liquid level of the glue return tank detected by the liquid level detection module, so that the return paint liquid level in the glue return tank is continuously pumped to the feeding port of the glue return filtering assembly at a set liquid level.

2. An automatic control system for top roll coating backflow of a size press according to claim 1, characterized in that: The glue return filtering assembly is at least two parallelly installed filters which are arranged between the glue pumping variable frequency pump and the glue preparation tank and are used for filtering and removing impurities from the return paint.

3. An automatic control system for top roll coating backflow of a size press according to claim 1, characterized in that: The set liquid level detected by the liquid level detection module in the glue return tank is 35% of the total liquid level measurement value of the glue return tank; when the liquid level measurement value of the glue return tank detected by the liquid level detection module exceeds 35%, the glue supply control center controls the rotating speed of the glue pumping variable frequency pump to increase and accelerate the discharge of the return paint in the glue return tank; when the liquid level measurement value of the glue return tank detected by the liquid level detection module is lower than 35%, the glue supply control center controls the rotating speed of the glue pumping variable frequency pump to decrease and slow down the discharge of the return paint in the glue return tank, so that the return paint of the top roller of the glue applicator to the glue return tank and the paint pumped from the glue pumping variable frequency pump to the glue preparation tank are automatically balanced.

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