JPH0260791B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement in a pulp dissolving device which stores high concentration pulp in a tank and takes it out while continuously dissolving it to a predetermined low concentration.

<Prior Art> In recent years, when dissolving pulp, it has become necessary to store the pulp at as high a concentration as possible and to take it out while continuously dissolving it to a predetermined low concentration. This is because pulp stored at a high concentration can be dissolved more easily and quickly than using a large amount of water to make a thriller with a predetermined concentration, and it is easier to manage to dilute the pulp to the desired concentration. Furthermore, the energy required for melting is much smaller, and the melting apparatus can be downsized. However, there is a problem in directly taking out high-concentration pulp from a storage tank because the higher the concentration, the more difficult it is to handle it as a fluid, making it difficult to maintain continuity. In this way, there are contradictory conditions for storage at high concentrations and continuous dilution.

A ripening device disclosed in Japanese Patent Publication No. 55-37638 is known as a proposal that has been attempted from this point of view. This ripening device has an agitator that performs agitation while spouting dilution water into a high-density pulp storage tank, and attempts to dissolve the high-density swollen pulp while dropping it with this agitator. However, since the pulp was highly concentrated, it swelled, became lumpy, and became heavy, resulting in a phenomenon in which stirring became impossible. It was unavoidable to install a special device for extraction, or to inject a large amount of water near the extraction port, but the biggest flaw with this device was, as mentioned above, the agitator, which stirs while spouting dilution water. The agitator attempts to dissolve the high-concentration pulp while dropping it, and the extraction port for the dissolved pulp is located in this stirring area, making it possible to extract the high-concentration pulp lumps that have not been dissolved by the agitator. The dissolving pulp was scraped off in the stirring area where the outlet was located, and the dissolving pulp concentration could not be stabilized uniformly in the dilution area, making it impossible to take out the dissolving pulp at the desired stable and uniform concentration. Moreover, it was impossible to reduce the energy for melting.

<Problems to be solved by the invention> The pulp dissolving device according to the present invention has been proposed to solve the above-mentioned problems, and its purpose is to store pulp at a high concentration. The purpose is to make it possible to continuously take out pulp at a predetermined, uniform, and stable low concentration.

It is also an object of the present invention to achieve the above-mentioned objects with low energy consumption.

<Means for Solving the Problems> In order to achieve the above objects, the pulp dissolving apparatus of the present invention has the following configuration.

That is, the lid 2 is attached to the top of the cylindrical tank 1,
The lid 2 is provided with a pulp inlet 3, and a rotary rod 7 is disposed at the lower end between an upper bearing 4 provided at the center of the lid 2 and a steady rest bearing 5 provided at the center of the bottom of the cylindrical tank 1. A rotary shaft 8 provided therein is sandwiched, and the rotary rod 8 includes:
The cylindrical tank 1 is provided with a scraping plate 6 whose lower end side is attached so as to be in contact with the bottom 14 of the tank 1, and a stirring drive 10 for rotating the rotary shaft is connected to the rotary shaft 8. This pulp dissolving device is provided with an outlet 13 for continuously taking out the dissolving pulp from the tank 1 at a position below the rotary rod 7 at the lower part of the tank 1. , a water cannon 17 is attached to the rotary shaft at a position directly above the rotary rod 7 and spaced apart in the circumferential direction around the rotary shaft 8, and each water cannon has an opening radially inside the cylindrical tank. Spout 16
A second water supply pipe 15 is connected to the water discharger, and a water supply pipe 15 is opened at the center of the bottom of the cylindrical tank 1, and water is poured into the tank 1 from the top of the cylindrical tank 1. A first water supply pipe 9 is disposed for discharging a rising water flow with sufficient strength to push up the high concentration pulp layer stored in the pulp layer, and the first water supply pipe 9 is provided with an on-off valve 11 for controlling release of the rising water flow. The stirring drive machine 10 connected to the rotating shaft 8 is provided with a torque detector 12 that opens and closes the opening/closing valve 11 according to the increase/decrease in the torque of the drive machine. Reference numeral 12 denotes a rotary rod 7 having the scraping plate 6, in which the dissolving pulp layer present in the diluted area in the tank 1 is continuously taken out from the takeout port 13, so that the dissolving pulp layer is reduced and the lower layer of the high concentration pulp layer is removed. An increase in the torque applied to the rotating shaft 8 is detected when the rotating shaft 8 descends to a position where it contacts the rotary shaft 8, and if the torque amount increases from the set torque value, the opening/closing valve 11 provided in the first water supply pipe 9 is opened to raise the water supply pipe 9. A water stream is released to push the lower end layer of the high-concentration pulp layer up to the position of the water spout 16 of the water sprayer 17 located directly above the rotary rod located above the dissolving pulp outlet 13 and float it up. In addition to storing the water, a decrease in the torque applied to the rotating shaft 8 due to the floating storage is detected, and when the torque amount decreases from a set torque value, the opening/closing valve 11 is closed to stop the release of the rising water flow. It is.

Similarly, in order to achieve the above object, the pulp dissolving apparatus of the present invention has the following configuration.

That is, the lid 2 is attached to the top of the cylindrical tank 1,
The lid 2 is provided with a pulp inlet 3, and a rotary rod 7 is disposed at the lower end between an upper bearing 4 provided at the center of the lid 2 and a steady rest bearing 5 provided at the center of the bottom of the cylindrical tank 1. A rotary shaft 8 provided therein is sandwiched, and the rotary rod 8 includes:
The cylindrical tank 1 is equipped with a scraping plate 6 whose lower end is connected to the bottom 14 of the tank 1, and a stirring drive 10 is connected to the rotating shaft 8 to rotate the rotating shaft. This pulp dissolving device is provided with an outlet 13 for continuously taking out the dissolving pulp from the tank 1 at a position below the rotary rod 7 at the lower part of the tank 1. , a float chamber 21 is provided on the rotating shaft 8 to give buoyancy to the rotating shaft 8 at a position above the position where the rotating rod 7 is provided; , a first water supply pipe 9 is disposed from the upper part of the cylindrical tank 1 and discharges a rising water flow with sufficient strength to push up the high concentration pulp layer stored in the tank 1, and the first water supply The pipe 9 is provided with an opening/closing valve 11 for controlling the release of the rising water flow, and the stirring drive unit 10 connected to the rotating shaft 8 is provided with an opening/closing valve 11 that controls the opening/closing operation of the opening/closing valve 11 in accordance with the increase/decrease in the torque of the drive unit. The torque detector 12 detects that the dissolved pulp existing in the diluted area in the tank 1 is continuously taken out from the takeout port 13, so that the dissolved pulp layer decreases and becomes a high concentration pulp. When the lower layer of the layer has settled to a position where it contacts the rotary rod 7 having the scraping plate 6, an increase in the torque applied to the rotary shaft 8 is detected, and if the torque amount has increased from the set torque value, the first The on-off valve 11 provided in the water supply pipe 9 is opened to release a rising water flow, and the lower end layer of the high-concentration pulp layer is pushed up to a position directly above the rotary rod located above the dissolving pulp take-out port 13 for floating storage. At the same time, a decrease in the torque applied to the rotating shaft 8 due to the floating storage is detected, and when the torque amount decreases from the set torque value, the opening/closing valve 11 is closed to stop the release of the rising water flow. be.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a longitudinal sectional view of the pulp dissolving apparatus of the present invention. 1 is a cylindrical tank with a lid 2 on the top;
The lid 2 is provided with a pulp inlet 3. A rotating shaft 8 extending from the upper center of the cylindrical tank 1 to the bottom 14 of the cylindrical tank is held between an upper bearing 4 provided on the lid 2 and a steady bearing 5 provided on the bottom 14. However, the rotation shaft 8 is prevented from wobbling by being sandwiched between the bearings arranged above and below. A plurality of rotating rods 7 are provided below the rotating shaft 8, and a scraping plate 6 is attached to the rotating rods. The rotating rod 7 is formed into a curved shape as shown in FIG.
It is arranged with the curved convex side facing the rotation direction of the rotary rod. Thereby, rotation of the rotary rod 7 is performed smoothly. The scraping plate 6 is swingably connected to a rotary rod 7, and is disposed so that its lower end side contacts the bottom portion 14 of the cylindrical tank 1, as shown in the figure. This makes it possible to effectively remove pulp lumps that have settled at the bottom of the cylindrical tank. A stirring drive 10 is connected to the rotating shaft 8 to rotate the rotating shaft. At the bottom of the cylindrical tank 1 and below the rotary rod 7, there is provided an outlet 13 for continuously taking out the dissolved pulp from the tank 1. More specifically, this outlet 13 is provided on the bottom surface in contact with the side wall of the cylindrical tank. A stirrer 24 is provided at the outlet 13. As shown in the figure, the bottom portion 14 of the cylindrical tank 1 is inclined downward toward the outlet 13 to improve the efficiency of extraction. In this way, the dissolved pulp is scraped up to the outlet 13 by the scraping plate 6 which rotates while contacting the bottom surface of the cylindrical tank.

Next, improvements that are characteristic of the present invention will be explained.

In the cylindrical tank 1, a water cannon 17 is attached to the rotary shaft at a position directly above the rotary rod 7 and spaced apart in the circumferential direction around the rotary shaft 8, and each water cannon has a cylindrical tank. Water spout 16 that opens radially inside the
is provided, and a second water supply pipe 15 is connected to the water discharger.

Further, 9 is a first water supply pipe, and the first water supply pipe is opened at the center of the bottom of the cylindrical tank 1. It is configured to emit an upward flow of water of sufficient strength to push up the pulp layer. The first water supply pipe 9 is provided with an on-off valve 11 for controlling release of the rising water flow. 12 is a torque detector, and this torque detector is connected to the stirring drive device 10.
The on-off valve 11 is connected to the on-off valve 11, and the on-off valve 11 is opened and closed according to the increase/decrease in the torque of the driving machine. The torque detector 12 detects that when the dissolved pulp existing in the diluted area in the cylindrical tank 1 is continuously taken out from the takeout port 13, the dissolved pulp layer is reduced and the lower layer of the high concentration pulp layer is removed from the scraping board. 6, an increase in the torque applied to the rotating shaft 8 is detected, and if the torque amount increases from the set torque value, the opening/closing control provided in the first water supply pipe 9 detects an increase in the torque applied to the rotating shaft 8. The valve 11 is opened to release a rising water flow to remove the high concentration pulp layer from the spout 16 of the water sprayer 17 located directly above the rotary rod 7 located above the dissolving pulp outlet 13. When the water is pushed up to a certain position and stored floatingly, a decrease in the torque applied to the rotating shaft 8 due to the floating storage is detected, and if the torque amount decreases from the set torque value, the opening/closing valve 11 is closed to stop the release of the rising water flow. It is configured as follows. Therefore, the storage area of the high concentration pulp layer floated and stored directly above the rotary rod 7 is always located above the dissolving pulp outlet 13.

As described above, in the present invention, the dissolving pulp existing in the diluted area in the cylindrical tank 1 is continuously taken out from the takeout port 13, so that the dissolving pulp layer is reduced, and the lower layer of the high concentration pulp layer is Scraping board 6
When the rotation rod 7 descends to a position where it contacts the rotating shaft 7, an increase in the torque applied to the rotating shaft 8 is detected.
The opening/closing valve 11 of the water supply pipe 9 is controlled to open and the rising water flow is discharged, thereby discharging the lower end layer of the high concentration pulp layer at the position of the water spout 16 of the water discharger 17 located directly above the rotating rod. When a decrease in the torque applied to the rotating shaft 8 due to this floating storage is detected, and the torque amount has decreased from the set torque value, the opening/closing valve 11
By closing and stopping the release of the rising water flow, the lower end layer of the high concentration pulp layer decreases as well as the dissolved pulp layer that is continuously taken out from the takeout port 13. and the above steps are repeated. In this way, the high-concentration pulp layer is floated and stored above the rotary rod 7, and is dissolved from the portion that is in contact with the dilution area. At this time, since the water spout 16 is opened in the contact area between the high concentration pulp layer that is pushed up and stored floating and the dilution region, the diluted water is discharged radially into the tank from the water spout 16. This further promotes dissolution in the contact area between the high concentration pulp layer and the diluted area.

In this way, the high concentration pulp layer charged from the upper part of the tank 1 is moved by the rising water flow discharged from the first water supply pipe 9 to the water spout 16 of the water discharger 17 located directly above the rotating rod. The dilution water is pushed up to the position and stored floatingly, and is discharged from the water spout 16 at the contact area with the dilution area to achieve more effective dissolution, and the dissolving pulp is removed from the dissolving pulp outlet 13.
Since the pulp is always located in the dilution area, the undissolved high-concentration pulp mass is scraped into the agitation area where the extraction port is located by the agitator, which stirs while spouting dilution water, as in the previously mentioned known example. This eliminates the problem of not being able to obtain a uniform and stable dissolving pulp concentration in the diluted region due to dropping the dissolving pulp, and being unable to take out the dissolving pulp at the desired stable and uniform concentration. uniform stabilization can be achieved.

Note that a timer 18 is installed in the second water supply pipe 15.
An on-off valve 19 is provided. When the dissolution reaches a steady state, by setting a timer, water is constantly sprayed from the water sprayer 17, and the pulp concentration can be kept constant. Furthermore, if the second water supply pipe 15 that supplies water to the water discharger 17 is housed in the first water supply pipe 9 as shown in the figure, the entire apparatus can be made compact. Furthermore, if a hollow passage 20 is bored in the steady rest bearing 5 and water is supplied to the water discharger 17 disposed around the rotating shaft 8 through the hollow passage, a second water supply pipe is formed in the cylindrical tank 1. 15
The space inside the cylindrical tank can be used effectively without being exposed.

Another improvement that is characteristic of the present invention is that a float chamber 21 is provided in the cylindrical tank 1 to the rotating shaft 8 at a position above the position where the rotating rod 7 is provided, which gives buoyancy to the rotating shaft. This is what we have set up. The float chamber 21 is a float made of a buoyant material, and is preferably a hollow body filled with gas such as air as shown in FIG. It may be installed concentrically around the rotating shaft 8, or a plurality of hollow pipes may be provided. By providing buoyancy to the rotating shaft 8, the float chamber 21 can reduce the weight applied to the steady rest bearing 5 and reduce damage to the bearing. In addition, it is possible to reduce the driving energy required to rotate the rotating shaft, and by making the rotation of the rotating shaft lighter, when the torque detector 12 detects the torque of the rotating shaft, it detects minute torque values. can.

Furthermore, to describe the embodiment shown in the drawings, the side wall of the cylindrical tank 1 is provided with a position above the rotary rod 7, more specifically between a high concentration pulp layer floating and stored and a dilution area. A water outlet 22 opened into the cylindrical tank is provided above the contact area. A water pipe 23 is connected to the water outlet 22 . The water pipe 23 is provided with an on-off valve 19 having a timer 18. The dilution water emitted from the water outlet 22 effectively swells the pulp and helps dissolve the pulp. Similar to the water sprayer 17, the water supply amount can be set in advance in the water pipe 23 using the timer 18 depending on the initial conditions such as the amount of pulp input, the amount of dissolved pulp taken out, and the concentration of dissolved pulp.

<Effects of the Invention> As described above, the pulp dissolving device of the present invention has a
The high-concentration pulp layer introduced from above is pushed up by the rising water flow discharged from the first water supply pipe 9 to the position of the water spout 16 of the water sprayer 17 disposed directly above the rotating rod, and is floated and stored. While dissolving the pulp, the dilution water discharged from the spout 16 is obtained at the part in contact with the dilution area to perform dissolution more effectively, and the dissolving pulp outlet 13 is always located in the dilution area. Therefore, as in the previously mentioned known example, the agitator that stirs while spouting dilution water scrapes undissolved pulp lumps into the stirring area where the extraction port is located, causing dissolution in the dilution area. It is possible to eliminate the defect of not being able to obtain uniform stabilization of the pulp concentration and to take out the dissolving pulp at the desired stable and uniform concentration, and it is possible to achieve uniform stabilization of the concentration of the dissolving pulp taken out from the take-out port. .

Moreover, since the pulp melting device of the present invention is provided with the float chamber 21 that gives buoyancy to the rotating shaft 8,
The driving energy required for rotating the rotating shaft can be reduced, and energy saving can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the pulp dissolving apparatus of the present invention, and FIG. 2 is a horizontal sectional view,
FIG. 3 is an enlarged vertical sectional view of a part of FIG. 1. In the figure, 1 is a cylindrical tank, 2 is a lid, 3 is a pulp inlet, 4 is an upper bearing, 5 is a steady rest bearing, 6
1 is a scraping plate, 7 is a rotating rod, 8 is a rotating shaft, 9 is a first water supply pipe, 10 is a stirring drive device, 11 is an on-off valve, 12 is a torque detector, 13 is a diluted pulp outlet, 14 is a cylinder At the bottom of the tank, 15 is a second water supply pipe, 16 is a water outlet, 17 is a water discharger, 18 is a timer, 19 is an on-off valve, 20 is a hollow passage, 21 is a float chamber, 22 is a water outlet, and 23 is a water pipe. , 24 is a stirrer.

Claims (1)

[Claims] 1. A lid 2 is attached to the upper part of the cylindrical tank 1, a pulp inlet 3 is provided on the lid 2, and an upper bearing 4 provided in the center of the lid 2 and the cylindrical tank 1 are connected to each other. A rotating shaft 8 with a rotating rod 7 disposed at its lower end is sandwiched between steady rest bearings 5 provided at the center of the bottom, and the rotating rod 8 is provided with a rotating shaft 8 such that its lower end is in contact with the bottom 14 of the tank 1. A stirring drive 10 is connected to the rotary shaft 8 to rotate the rotary shaft. An outlet 13 for continuously taking out the dissolving pulp from 1
A water sprayer 17 is installed on the rotary shaft 8 in the cylindrical tank 1 at a position directly above the rotary rod 7 and spaced apart in the circumferential direction around the rotary shaft 8. , each water discharger has a water spout 16 that opens radially inside the cylindrical tank.
A second water supply pipe 15 is connected to the water discharger, and a water supply pipe 15 is opened at the center of the bottom of the cylindrical tank 1, and water is poured into the tank 1 from the top of the cylindrical tank 1. A first water supply pipe 9 is disposed for discharging a rising water flow with sufficient strength to push up the high concentration pulp layer stored in the pulp layer, and the first water supply pipe 9 is provided with an on-off valve 11 for controlling release of the rising water flow. The stirring drive machine 10 connected to the rotating shaft 8 is provided with a torque detector 12 that opens and closes the opening/closing valve 11 according to the increase/decrease in the torque of the drive machine. Reference numeral 12 denotes a rotary rod 7 having the scraping plate 6, in which the dissolving pulp layer present in the diluted area in the tank 1 is continuously taken out from the takeout port 13, so that the dissolving pulp layer is reduced and the lower layer of the high concentration pulp layer is removed. An increase in the torque applied to the rotating shaft 8 is detected when the rotating shaft 8 descends to a position where it contacts the rotary shaft 8, and if the torque amount increases from the set torque value, the opening/closing valve 11 provided in the first water supply pipe 9 is opened to raise the water supply pipe 9. A water stream is released to push the lower end layer of the high-concentration pulp layer up to the position of the water spout 16 of the water sprayer 17 located directly above the rotary rod located above the dissolving pulp outlet 13 and float it up. In addition to storing the water, a decrease in the torque applied to the rotating shaft 8 due to the floating storage is detected, and when the torque amount decreases from a set torque value, the opening/closing valve 11 is closed to stop the release of the rising water flow. A pulp dissolving device featuring: 2. A lid 2 is attached to the top of the cylindrical tank 1, a pulp inlet 3 is provided on the lid 2, an upper bearing 4 is installed in the center of the lid 2, and a swing is installed in the center of the bottom of the cylindrical tank 1. A rotating shaft 8 having a rotating rod 7 disposed at its lower end is sandwiched between the stop bearings 5, and a scraping plate is attached to the rotating rod 8 so that its lower end is in contact with the bottom 14 of the tank 1. 6, and a stirring drive 10 for rotating the rotating shaft is connected to the rotating shaft 8, and dissolving pulp is continuously supplied from the tank 1 to a position below the rotating rod 7 at the lower part of the cylindrical tank 1. Exit port 13 for taking out the target
This is a pulp melting device equipped with a float chamber 21 that gives buoyancy to the rotating shaft 8 at a position above the position where the rotating rod 7 is provided in the cylindrical tank 1, and At the center of the bottom of the cylindrical tank 1, a rising water flow having sufficient strength to push up the high concentration pulp layer introduced from the top of the cylindrical tank 1 and stored in the tank 1 is provided. A first water supply pipe 9 for discharging is disposed, and the first water supply pipe 9 is provided with an opening/closing valve 11 for controlling the discharge of the rising water flow. A torque detector 12 is provided that opens and closes the opening/closing valve 11 according to increases and decreases in the torque of the machine, and the torque detector 12 detects that the dissolved pulp present in the diluted area in the tank 1 is continuously supplied from the takeout port 13. When the dissolved pulp layer decreases and the lower layer of the high concentration pulp layer settles to a position where it contacts the rotating rod 7 having the scraping plate 6, the torque applied to the rotating shaft 8 increases. When it is detected that the torque amount has increased from the set torque value, the opening/closing valve 11 provided in the first water supply pipe 9 is opened to release a rising water flow, and the lower end layer of the high concentration pulp layer is removed from the dissolving pulp outlet 13. It is pushed up to a position directly above the rotating rod located above to float and store it, and detects a decrease in the torque applied to the rotating shaft 8 due to the floating storage, and when the torque amount decreases from the set torque value, the opening/closing valve A pulp dissolving device characterized in that the apparatus is configured to close the opening 11 to stop the discharge of the rising water flow.