Surface sizing system capable of being cleaned on line

Abstract

The utility model discloses a surface sizing system capable of being cleaned on line, which comprises a surface sizing circulating barrel, a feeding pump, a filter, a high-position barrel, a surface sizing roller, a backflow buffering barrel, a backflow pump, a vibrating screen and a backflow three-way valve, a liquid outlet of the reflux pump is connected with a liquid inlet of the vibrating screen through a pipeline, a liquid outlet of the vibrating screen is connected with a liquid inlet of the reflux three-way valve, and a liquid outlet of the reflux three-way valve is divided into two paths, namely, the first path is connected with a liquid inlet of the feeding pump through a pipeline, and a liquid outlet of the feeding pump is connected with a liquid inlet of the filter through a pipeline; a liquid outlet in the top of the filter is connected with a feeding hole of the high-position barrel through a pipeline, a discharging hole in the bottom of the high-position barrel is connected with a liquid inlet of the surface sizing roller through a pipeline, and a liquid outlet of the surface sizing roller is connected with a liquid inlet in the side part of the backflow buffer barrel through a pipeline, so that the problems of frequent cleaning and large flow fluctuation of a surface sizing agent are effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to papermaking process equipment, concretely relates to a surface sizing system of on -line cleaning. BACKGROUND

[0002] Surface sizing has become an indispensable process in the production process of special paper (such as glassine paper, oil-proof paper, etc.), and the surface strength of paper can be greatly improved by coating surface sizing agent (such as starch, PVA or CMC solution or mixed solution) on the surface of paper, and the paper can also be endowed with special properties by adding special additives (such as oil-proof agent, water-resistant agent, etc.) in the surface sizing agent. As the surface sizing agent flow sending system, the rationality of the design of the surface sizing system plays a crucial role in the stability of product quality. In the production process, the surface sizing agent is generally recycled by the surface sizing circulating barrel, and during this period, the barrel wall and the bottom of the circulating barrel are easy to accumulate glue deposits and particulate impurities, which will produce appearance paper diseases on the paper surface, and in severe cases, it will damage the performance of functional additives, so the surface sizing circulating barrel needs to be cleaned frequently. In addition, when the viscosity of the surface sizing agent is large, the flow fluctuation of the surface sizing agent is very large, which seriously affects the stability of product quality. Therefore, there is an urgent need for a surface sizing system that can be cleaned online without stopping and can ensure the stability of the flow of surface sizing agent. SUMMARY

[0003] In view of the problems existing in the prior art, the purpose of the utility model is to provide a surface sizing system that can be cleaned online, to solve the problems of frequent cleaning of the surface sizing circulating barrel and large flow fluctuation of the surface sizing agent.

[0004] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0005] A surface sizing system that can be cleaned online, comprising a surface sizing circulating barrel, a feeding pump, a filter, a high-position barrel, a surface sizing roller, a backflow buffer barrel, a backflow pump, a vibrating screen and a backflow tee valve, a surface sizing backflow port, a feeding port and a blowdown port one are sequentially arranged from top to bottom on one side of the bottom of the surface sizing circulating barrel, the backflow port of the side of the backflow buffer barrel is connected with the liquid inlet of the backflow pump through a pipeline, the liquid outlet of the backflow pump is connected with the liquid inlet of the vibrating screen through a pipeline, the liquid outlet of the vibrating screen is connected with the liquid inlet of the backflow tee valve, the liquid outlet one of the backflow tee valve is divided into two routes: the first route is that the liquid outlet one of the backflow tee valve is connected with the liquid inlet of the feeding pump through a pipeline, the liquid outlet of the feeding pump is connected with the liquid inlet of the filter through a pipeline, the top liquid outlet of the filter is connected with the feeding port of the high-position barrel through a pipeline, the discharging port at the bottom of the high-position barrel is connected with the liquid inlet of the surface sizing roller through a pipeline, and the liquid outlet of the surface sizing roller is connected with the liquid inlet of the side of the backflow buffer barrel through a pipeline.

[0006] Further, the overflow port of the high-position barrel side is connected with the liquid inlet of the vibrating screen through a pipeline.

[0007] Further, the second path of the liquid outlet one of the reflux three-way valve is that the liquid outlet one of the reflux three-way valve is connected with the feeding port of the surface sizing agent circulating barrel through a pipeline.

[0008] Further, the liquid outlet two of the reflux three-way valve is connected with the surface sizing agent reflux port of the surface sizing agent circulating barrel through a pipeline.

[0009] Further, a standby filter is arranged, the liquid outlet of the filter is connected with the liquid inlet of the standby filter through a pipeline, the liquid outlet of the standby filter is connected with the feeding port of the high-position barrel through a pipeline, and a valve is arranged on the pipeline connecting the standby filter with the filter.

[0010] Further, the inner bottom wall of the surface sizing agent circulating barrel is provided with a slope structure one, and the feeding port and the blowdown port one are both provided with valves.

[0011] Further, the feeding port of the high-position barrel is in the tangential direction of the barrel wall.

[0012] Further, the inner bottom wall of the reflux buffer barrel is provided with a slope structure two, and the bottom of the reflux buffer barrel is provided with a blowdown port two, and the reflux port and the blowdown port two are both provided with valves.

[0013] Compared with the prior art, the utility model has the beneficial effects as follows:

[0014] 1) the system can realize online cleaning of the surface sizing agent circulating barrel, and effectively solves the problems of frequent cleaning and large surface sizing agent flow fluctuation;

[0015] 2) the utility model discloses a reflux three-way valve is used for controlling the reflux surface sizing agent liquid to return to the surface sizing agent circulating barrel or the feeding pump, when the surface sizing agent circulating barrel needs to be cleaned, the surface sizing agent liquid is directly returned to the feeding pump to make the surface sizing agent liquid circulate, and the surface sizing agent circulating barrel is cleaned online;

[0016] 3) the high-position barrel of the system is provided with an overflow port, the liquid level of the high-position barrel is always kept at the position of the overflow port by controlling the flow of the feeding pump, the stability of the surface sizing agent liquid flow into the surface sizing roller is guaranteed, the system improves the product production efficiency, and the stability of the product quality is guaranteed;

[0017] 4) the system can clean the surface sizing agent circulating barrel without stopping, and greatly improves the paper machine production efficiency and the stability of the product quality. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 It is a whole structure schematic view of the system;

[0019] Fig. 2 The high-position barrel is a top view of the utility model.

[0020] In the figure: 3, surface sizing roller; 5, feeding pump; 6, backflow pump; 8, backflow three-way valve; 9, vibrating screen; 11, surface sizing circulating barrel; 12, slope structure one; 13, feeding opening; 14, surface sizing backflow opening; 15, sewage opening one; 21, high-position barrel; 22, feeding opening; 23, discharging opening; 24, overflow opening; 41, backflow buffer barrel; 42, slope structure two; 43, backflow opening; 44, sewage opening two; 71, filter; 72, standby filter. DETAILED DESCRIPTION

[0021] The utility model will be further explained in connection with the drawings, but the range protected by the utility model is not limited to the range.

[0022] Please refer to Figs. 1-2 A surface sizing system capable of being cleaned on line, comprising a surface sizing circulating barrel 11, a feeding pump 5, a filter 71, a high-position barrel 21, a surface sizing roller 3, a backflow buffer barrel 41, a backflow pump 6, a vibrating screen 9 and a backflow three-way valve 8, the surface sizing circulating barrel 11 is provided with a surface sizing backflow opening 14, a feeding opening 13 and a sewage opening one 15 from top to bottom on one side close to the bottom, the backflow opening 43 of the side part of the backflow buffer barrel 41 is connected with the liquid inlet of the backflow pump 6 through a pipeline, the liquid outlet of the backflow pump 6 is connected with the liquid inlet of the vibrating screen 9 through a pipeline, the liquid outlet of the vibrating screen 9 is connected with the liquid inlet of the backflow three-way valve 8, the liquid outlet of the backflow three-way valve 8 is divided into two ways: the first way is that the liquid outlet of the backflow three-way valve 8 is connected with the liquid inlet of the feeding pump 5 through a pipeline, the liquid outlet of the feeding pump 5 is connected with the liquid inlet of the filter 71 through a pipeline, the liquid outlet at the top of the filter 71 is connected with the feeding opening 22 of the high-position barrel 21 through a pipeline, the discharging opening 23 at the bottom of the high-position barrel 21 is connected with the liquid inlet of the surface sizing roller 3 through a pipeline, and the liquid outlet of the surface sizing roller 3 is connected with the liquid inlet of the side part of the backflow buffer barrel 41 through a pipeline.

[0023] The second way of the liquid outlet of the backflow three-way valve 8 is that the liquid outlet of the backflow three-way valve 8 is connected with the feeding opening 13 of the surface sizing circulating barrel 11 through a pipeline.

[0024] The liquid outlet two of the backflow three-way valve 8 is connected with the surface sizing backflow opening 14 of the surface sizing circulating barrel 11 through a pipeline.

[0025] In the embodiment, the system further comprises a standby filter 72, the liquid outlet of the side part of the filter 71 is connected with the liquid inlet of the standby filter 72 through a pipeline, and the liquid outlet of the standby filter 72 is connected with the feeding opening 22 of the high-position barrel 21 through a pipeline, wherein a valve is arranged on the pipeline connected with the filter 71.

[0026] Normally, the valve on the pipeline connecting the standby filter 72 with the filter 71 is in the closed state, and when the filter 71 is under maintenance or failure, the valve is opened to ensure the normal operation of the system.

[0027] In order to prevent impurities from blocking the liquid inlet and outlet of the equipment, a slope structure one 12 is arranged on the inner bottom wall of the surface sizing circulating barrel 11, and a slope structure two 42 is arranged on the inner bottom wall of the backflow buffer barrel 41.

[0028] Further, the feeding port 13 and the blowdown port one 15 of the surface sizing circulating barrel 11 are each provided with a valve.

[0029] Further, the backflow buffer barrel 41 is provided with a blowdown port two 44 at the bottom, and the backflow port 43 and the blowdown port two 44 are each provided with a valve. The feeding port 22 of the high-position barrel 21 is in the tangential direction of the barrel wall.

[0030] The cleaning process of the surface sizing circulating barrel 11 using the system is as follows:

[0031] When the surface sizing circulating barrel 11 needs to be cleaned, the liquid level of the backflow buffer barrel 41 is accumulated to a high position, the valve of the feeding port 13 of the surface sizing circulating barrel is closed, and the blowdown port 15 of the surface sizing circulating barrel is opened.

[0032] The backflow tee valve 8 switches the backflow surface sizing liquid to the backflow pump 5, so that the surface sizing liquid is circulated in the feeding pump 05, the filter 71, the high-position barrel 21, the surface sizing roller 3, the backflow buffer barrel 41, the backflow pump 6, the vibrating screen 9 and the feeding pump 5. At this time, the surface sizing circulating barrel 11 and the pipeline filter 71 are quickly cleaned, and after the cleaning is completed, the circulation of the surface sizing liquid is restored to the normal working route, and the liquid level of the backflow buffer barrel 41 is restored to a low position.

[0033] When the system is normally working, the pipeline filter 71 can continuously filter out a part of impurities in the surface sizing liquid, reduce the cleaning frequency of the surface sizing circulating barrel 11, and the two sets of pipeline filters in parallel also enable the pipeline filter to be cleaned online. When the high-position barrel 21 is working, the surface sizing liquid enters in the tangential direction of the barrel wall, avoids the fluctuation of the liquid level of the surface sizing liquid in the high-position barrel 21, simultaneously provides the surface sizing liquid in the high-position barrel 21 with stirring action in the same direction, removes a part of air in the surface sizing liquid, controls the flow of the surface sizing liquid entering the high-position barrel 21, keeps the liquid level of the high-position barrel 21 at the position of the overflow port 24 of the high-position barrel 21 at all times, and keeps the flow of the surface sizing liquid flowing into the surface sizing roller 3 stable. The liquid level of the backflow buffer barrel 41 is kept at a low position at all times, so as to avoid the accumulation of the precipitate and impurities in the surface sizing liquid at the position.

Claims

1. An online washable surface coating system, comprising a surface coating circulation tank (11), a feeding pump (5), a filter (71), a high-level tank (21), a surface coating roller (3), a return buffer tank (41), a return pump (6), a vibrating screen (9), and a return three-way valve (8), wherein the surface coating circulation tank (11) is provided with a surface coating return port (14), a feeding port (13), and a drain port (15) on one side near the bottom, from top to bottom, characterized in that... The reflux port (43) on the side of the reflux buffer tank (41) is connected to the liquid inlet of the reflux pump (6) through a pipeline. The liquid outlet of the reflux pump (6) is connected to the liquid inlet of the vibrating screen (9) through a pipeline. The liquid outlet of the vibrating screen (9) is connected to the liquid inlet of the reflux three-way valve (8). The liquid outlet of the reflux three-way valve (8) is divided into two paths: the first path is: the liquid outlet of the reflux three-way valve (8) is connected to the liquid inlet of the feeding pump (5) through a pipeline. The liquid outlet of the feeding pump (5) is connected to the liquid inlet of the filter (71) through a pipeline. The liquid outlet at the top of the filter (71) is connected to the feed inlet (22) of the high-level tank (21) through a pipeline. The discharge port (23) at the bottom of the high-level tank (21) is connected to the liquid inlet of the surface gluing roller (3) through a pipeline. The liquid outlet of the surface gluing roller (3) is connected to the liquid inlet on the side of the reflux buffer tank (41) through a pipeline.

2. The online washable surface coating system according to claim 1, characterized in that... The overflow port (24) on the side of the high-level tank (21) is connected to the liquid inlet of the vibrating screen (9) through a pipeline.

3. The online washable surface coating system according to claim 1, characterized in that... The second path of the liquid outlet of the reflux three-way valve (8) is: the liquid outlet of the reflux three-way valve (8) is connected to the feed port (13) of the surface adhesive circulation tank (11) through a pipeline.

4. The online washable surface coating system according to claim 1, characterized in that... The liquid outlet of the reflux three-way valve (8) is connected to the surface adhesive return port (14) of the surface adhesive circulation tank (11) through a pipeline.

5. The online washable surface coating system according to claim 1, characterized in that... Includes a backup filter (72), the liquid outlet on the side of the filter (71) is connected to the liquid inlet of the backup filter (72) through a pipeline, the liquid outlet of the backup filter (72) is connected to the feed inlet (22) of the high-level tank (21) through a pipeline, wherein a valve is provided on the pipeline connecting the backup filter (72) and the filter (71).

6. The online washable surface coating system according to claim 1, characterized in that... The inner bottom wall of the surface adhesive circulation tank (11) has a sloping structure (12), and valves are provided at its feed port (13) and drain port (15).

7. The online washable surface coating system according to claim 1, characterized in that... The feed inlet (22) of the high-level tank (21) is along the tangential direction of the tank wall.

8. The online washable surface coating system according to claim 1, characterized in that... The bottom wall of the reflux buffer tank (41) is provided with a second sloping structure (42), and the bottom of the reflux buffer tank (41) is provided with a second drain outlet (44). Both the reflux outlet (43) and the second drain outlet (44) are equipped with valves.

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