A suction roll and an automatic control method for reducing the damage of the felt and the shoe sleeve of a paper machine

Abstract

The present invention discloses a suction roll and an automatic control method for reducing the damage of the felt and the shoe sleeve of a paper machine, including a suction roll body and a felt. The bottom of the suction roll body is in contact with the felt. A shoe sleeve is provided on the suction roll body. A water collecting frame is provided below the suction roll body, and the water collecting frame is located inside the felt. Traction mechanisms are provided on both sides of the water collecting frame, and a scraper is provided between the two traction mechanisms. In the PLC logic of the present invention, the signals of the scraper traction mechanism and the paper break signal of the front cylinder are added to the interlock conditions allowing the suction roll to drop. During paper threading, the suction roll can only drop when the scraper is in a state away from the suction roll, thereby effectively avoiding the occurrence of accidents of damage to the felt and the shoe sleeve caused by the abnormal opening of the scraper during the paper threading process.

Description

Technical Field

[0001] The present invention relates to the technical field of suction transfer rollers, and specifically relates to a suction transfer roller and an automatic control method for reducing the damage of paper machine felts and shoe covers. Background Art

[0002] In order to ensure the cleanliness of the vacuum suction transfer roller in the paper machine, it is necessary to scrape and wash it. In the prior art, a lower scraper is directly set for cleaning, not only the cleaning effect is not good, but also when the vacuum suction transfer roller is lowering the leading paper, if the lower scraper is not closed or the whole paper is between the second press and a set of cylinders, the lower scraper will leave the closed position. At this time, the whole paper page cannot be peeled off from the felt in time and enter the broke pool, and the paper page will then follow the felt back to the press zone, thus easily causing the paper page to accumulate in the press zone and resulting in the extrusion damage of the felt and the shoe cover. Summary of the Invention

[0003] The purpose of the present invention is to provide a suction transfer roller and an automatic control method for reducing the damage of paper machine felts and shoe covers to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A suction transfer roller for reducing the damage of paper machine felts and shoe covers, including a suction transfer roller body and a felt. The bottom of the suction transfer roller body is in contact with the felt. A shoe cover is provided on the suction transfer roller body. A water collecting frame is provided below the suction transfer roller body. The water collecting frame is located inside the felt. Traction mechanisms are provided on both sides of the water collecting frame. A scraper is provided between the two traction mechanisms.

[0005] Long waist holes and second rolling bearings are provided on both sides of the water collecting frame. The second rolling bearings are located above the long waist holes. Slide rails are also provided on both sides of the long waist holes.

[0006] Preferably, the traction mechanism includes a slider. The two sides of the slider are arranged on the slide rails. A first rolling bearing is provided on the slider. The first rolling bearing corresponds to the long waist hole. A first rotating shaft is inserted into the first rolling bearing. One end of the first rotating shaft passes through the long waist hole and is connected to a limit block. The limit block is located inside the water collecting frame. The other end of the first rotating shaft is fixedly connected to one end of a connecting rod. The other end of the connecting rod is connected to an L-shaped rotating shaft. One end of the L-shaped rotating shaft passes through the second rolling bearing and is connected to a flange. A scraper is connected between the two flanges on both sides.

[0007] Preferably, the side of the slider is connected to a cylinder. The cylinder is arranged on the water collecting frame.

[0008] Preferably, a sensor is provided on one of the limit blocks.

[0009] Preferably, a spray pipe is provided on the inner side wall of the water collecting frame. A plurality of nozzles are provided on the spray pipe, and the nozzles correspond to the scraper. One end of the spray pipe is connected to a water supply pipe, and an induction valve is provided on the water supply pipe;

[0010] A drain port is provided at the bottom of the water collecting frame.

[0011] Preferably, the automatic control method is as follows:

[0012] Connect the signal of the traction mechanism to the paper machine MCS system. In the PLC logic, interlock the signal of the scraper traction mechanism, the signal of the front cylinder paper break, and the suction roll body. Only when the traction mechanism drives the scraper away from the suction roll body can the signal be normally fed back to the MCS system, and the suction roll is allowed to drop to guide the paper. It is not until the entire paper width is widened after sizing that the traction mechanism can drive the scraper to return to its position and press against the suction roll body;

[0013] In addition, to prevent the situation where the scraper is in a state of being away from the suction roll body and the signal reception of the traction mechanism fails, resulting in the suction roll body being unable to guide the paper normally, a release button for the signal of the scraper traction mechanism is added to the upper computer of the MCS system. When a fault occurs, the interlock can be released to ensure normal paper guiding production.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The specially designed traction mechanism of the present invention can change the turning direction of the scraper, so that it can drive the scraper to approach the suction roll body or retract into the water collecting frame according to actual working needs. After receiving the induction, the specially designed spray pipe will spray the cleaning liquid to clean the scraper, preventing the accumulation of impurities on the blade surface during the operation of the scraper and reducing the cleaning efficiency of the suction roll.

[0016] In addition, the signal of the scraper traction mechanism and the signal of the front cylinder paper break are added to the interlock condition for allowing the suction roll to drop in the PLC logic. Only when the scraper is in a state away from the suction roll during paper guiding can the suction roll drop, thus effectively avoiding the occurrence of accidents such as damage to the felt and the boot sleeve caused by the abnormal opening of the scraper during the paper guiding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 is a side view schematic diagram of the traction mechanism of the present invention installed on the water collecting frame;

[0019] Figure 3 is a schematic diagram of the structure of the present invention when the scraper is retracted into the water collecting frame;

[0020] Figure 4 is a side view schematic diagram of the structure of the spray pipe in the water collecting frame of the present invention;

[0021] Figure 5 Schematic diagram of the connection structure between the traction mechanism and the scraper of the present invention;

[0022] Figure 6 Front view schematic diagram of the structure of the inner spray pipe of the water collecting frame of the present invention;

[0023] Figure 7 Front view schematic diagram of the internal structure of the water collecting frame of the present invention. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] Please refer to Figure 1 , the present invention provides a technical solution: a suction transfer roll for reducing the damage of the felt and the shoe cover of a paper machine, including a suction transfer roll body 1 and a felt 2, the bottom of the suction transfer roll body 1 is in contact with the felt 2, and a shoe cover 11 is provided on the suction transfer roll body 1;

[0028] A water collecting frame 3 is provided below the suction roll body 1, and the water collecting frame 3 is located inside the felt 2. Traction mechanisms 4 are provided on both sides of the water collecting frame 3, and a scraper 5 is provided between the two traction mechanisms 4. The scraper is driven to rotate by the traction mechanisms;

[0029] Wherein, long waist holes 31 and second rolling bearings 32 are provided on both sides of the water collecting frame 3. The second rolling bearings 32 are located above the long waist holes 31, and slide rails 33 are further provided on both sides of the long waist holes 31;

[0030] A drain port 34 is provided at the bottom of the water collecting frame 3 for draining water.

[0031] As shown in the figure, in this embodiment, the traction mechanism 4 includes a slider 41. After setting both sides of the slider 41 on the slide rails 33, the slider can be moved left and right. A first rolling bearing 42 is provided on the slider 41, and the first rolling bearing 42 corresponds to the long waist hole 31. Then, a first rotating shaft 43 is inserted into the first rolling bearing 42 to facilitate the rotation of the rotating shaft. One end of the first rotating shaft 43 also passes through the long waist hole 31, and a limit block 431 is connected to the end for limit fixation. The limit block 431 is located inside the water collecting frame 3. The other end of the first rotating shaft 43 is fixedly connected to one end of a connecting rod 44. The other end of the connecting rod 44 is connected to an L-shaped rotating shaft 45, and one end of the L-shaped rotating shaft 45 is inserted into the second rolling bearing 32 to facilitate the rotation of the L-shaped rotating shaft. At the same time, a flange 451 is connected to the end. When the slider is pushed forward on the slide rail, the connecting rod will be pulled obliquely backward. At this time, the L-shaped rotating shaft will also swing backward following the connecting rod. When the slider is pushed backward on the slide rail, the connecting rod will be pulled obliquely forward. At this time, the L-shaped rotating shaft will also swing forward following the connecting rod;

[0032] Since the scraper 5 is connected between the flanges 451 on both sides, when the L-shaped rotating shaft swings forward following the connecting rod, the scraper will also move forward accordingly and press against the suction roll body. When the L-shaped rotating shaft swings backward following the connecting rod, the scraper will also move backward accordingly and move away from the suction roll body and be retracted into the water collecting frame.

[0033] By connecting the side of the slider 41 to a cylinder 46 and arranging the cylinder 46 on the water collecting frame 3, after starting the cylinder, the slider can be pushed to slide back and forth automatically;

[0034] In addition, a sensor 432 is provided on one of the limit blocks 431 for transmitting induction signals.

[0035] As shown in the figure, in this embodiment, a spray pipe 6 is provided on the inner side wall of the water collecting frame 3, and a plurality of nozzles 61 are arranged on the spray pipe 6. The nozzles 61 correspond to the scraper 5. One end of the spray pipe 6 is connected to a water supply pipe 62, and the water supply pipe can be externally connected to a cleaning liquid storage tank. In addition, an induction valve 621 is provided on the water supply pipe 62. As the slider moves, when the sensor approaches the induction valve, the induction valve receives the signal and opens the water supply pipe. At this time, the cleaning liquid will be sprayed on the scraper to wash it.

[0036] Working principle: When the suction transfer roll needs to be cleaned, start the traction mechanism to drive the scraper to turn. As the slider moves backward, the scraper will closely adhere to the body of the suction transfer roll. Under the continuous rotation of the suction transfer roll, impurities are scraped off. At the same time, the sensor also approaches the induction valve as the slider moves. At this time, after the induction valve senses the signal, it will open the water supply pipe, and spray the cleaning liquid on the scraper, so that impurities can be scraped off while the scraper is being cleaned, ensuring that the scraper is always in a clean state during operation and ensuring the cleaning effect of the suction transfer roll.

[0037] After cleaning, drive the scraper to turn again through the traction mechanism to make it away from the body of the suction transfer roll and enter the water collecting frame. As the slider moves away, the sensor will also move away. At this time, the induction valve no longer senses the signal and the spray pipe closes.

[0038] Finally, the waste water in the water collecting frame can be discharged from the drain port.

[0039] The specific automatic control method for the suction transfer roll to reduce the damage of the paper machine felt and the shoe cover is as follows:

[0040] Connect the signal of the traction mechanism to the paper machine MCS system, and interlock the signal of the scraper traction mechanism, the signal of the front cylinder paper break, and the body of the suction transfer roll within the PLC logic. Only when the traction mechanism drives the scraper away from the body of the suction transfer roll can the signal be normally fed back to the MCS system, and the suction transfer roll is allowed to lower the paper guide. It is not until the entire paper width is widened after sizing that the traction mechanism can drive the scraper to return to its position and closely adhere to the body of the suction transfer roll.

[0041] In addition, to prevent the situation that when the scraper is in the state of being away from the body of the suction transfer roll and the signal reception of the traction mechanism fails, resulting in the inability of the body of the suction transfer roll to normally guide the paper, an additional release button for the signal of the scraper traction mechanism is added to the upper computer of the MCS system. When a failure occurs, the interlock can be released to ensure normal paper guiding production.

[0042] For those skilled in the art, it is obvious that the invention is not limited to the details of the above exemplary embodiments, and the invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the invention. Any reference signs in the claims should not be construed as limiting the claims concerned.

[0043] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic control method for a suction transfer roll to reduce the damage of the paper machine felt and the shoe sleeve, characterized in that: The automatic control method is as follows: Connect the signals of the traction mechanism to the paper machine MCS system. In the PLC logic, interlock the signals of the doctor blade traction mechanism, the paper break signal of the front cylinder, and the suction roll body. Only when the traction mechanism drives the doctor blade away from the suction roll body can the signals be normally fed back to the MCS system, and the suction roll is allowed to lower for paper guiding. It is not until the entire paper width is widened after sizing that the traction mechanism drives the doctor blade to return to its position and press tightly against the suction roll body; The bottom of the suction roll body (1) is in contact with the felt (2). A boot sleeve (11) is provided on the suction roll body (1). A water collecting frame (3) is provided below the suction roll body (1). The water collecting frame (3) is located inside the felt (2). Traction mechanisms (4) are provided on both sides of the water collecting frame (3). A doctor blade (5) is provided between the two traction mechanisms (4); Long waist holes (31) and second rolling bearings (32) are provided on both sides of the water collecting frame (3). The second rolling bearings (32) are located above the long waist holes (31). Slide rails (33) are further provided on both sides of the long waist holes (31); A drain port (34) is provided at the bottom of the water collecting frame (3); The traction mechanism (4) includes a slider (41). Both sides of the slider (41) are arranged on the slide rails (33). A first rolling bearing (42) is provided on the slider (41). The first rolling bearing (42) corresponds to the long waist hole (31). A first rotating shaft (43) is inserted into the first rolling bearing (42). One end of the first rotating shaft (43) passes through the long waist hole (31) to connect a limit block (431). The limit block (431) is located inside the water collecting frame (3). The other end of the first rotating shaft (43) is fixedly connected to one end of a connecting rod (44). The other end of the connecting rod (44) is connected to an L-shaped rotating shaft (45). One end of the L-shaped rotating shaft (45) passes through the second rolling bearing (32) to connect a flange (451). The doctor blade (5) is connected between the two flanges (451) on both sides; The side of the slider (41) is connected to a cylinder (46). The cylinder (46) is arranged on the water collecting frame (3); A sensor (432) is provided on one of the limit blocks (431); A spray pipe (6) is provided on the inner side wall of the water collecting frame (3). A plurality of nozzles (61) are provided on the spray pipe (6). The nozzles (61) correspond to the doctor blade (5). One end of the spray pipe (6) is connected to a water supply pipe (62). An induction valve (621) is provided on the water supply pipe (62); As the slider (41) moves, after the sensor (432) approaches the induction valve (621), when the induction valve (621) receives the signal, it will open the water supply pipe (62). At this time, the cleaning liquid will be sprayed on the doctor blade (5) to wash the doctor blade (5).

2. The automatic control method of a suction roll for reducing the damage of the felt and the shoe cover of a paper machine according to claim 1, characterized in that: To prevent the situation where the doctor blade is in a state of being away from the suction roll body, but a fault occurs in the reception of the traction mechanism signal, resulting in the suction roll body being unable to guide paper normally, an additional release button for the doctor blade traction mechanism signal is added to the upper computer of the MCS system. When a fault occurs, the interlock can be released to ensure normal paper guiding production.

Images