JP2020153040A - Used paper processor - Google Patents

Abstract

To provide a used paper processor capable of properly controlling a fiber concentration by preventing overflow of a liquid from a storage part even when an error occurs at a liquid level detection part.SOLUTION: The used paper processor 1 is assembled with: a storage part for storing a liquid containing fiber obtained by stirring a used paper together with water; a takeout part provided at the storage part to take the liquid containing fiber out from the storage part; a liquid level detection part for detecting a liquid level of the liquid containing fiber stored in the storage part; and a control part 8 for controlling the liquid containing fiber to be subjected to a desired processing; wherein the control part processes the liquid containing fiber based on at least one of a detection result of the liquid level detection part and a take-out amount of the liquid containing fiber taken-out from the takeout part.SELECTED DRAWING: Figure 1

Description

The present invention relates to a waste paper processing apparatus.

Regarding the used paper processing apparatus, the following Patent Document 1 describes the amount of used paper, calculates the number of recycled papers that can be prepared from the obtained amount, and prepares the recycled paper within the range of the number of sheets and within a preset operating time. Calculate the number of recycled papers that can be made. Then, a technique for displaying the calculation result on an operation panel or the like is disclosed.

Japanese Patent No. 5511341

In the apparatus of Patent Document 1, a storage unit for storing a fiber-containing liquid obtained by stirring used paper with water is described. If an error occurs in the liquid level detection unit that detects the liquid level of the fiber-containing liquid stored in the storage unit, the liquid may overflow from the storage unit and stain the floor or the like. In addition, the concentration of the fiber-containing liquid cannot be properly controlled, and the thickness of the obtained recycled paper may not be stable.

The present invention solves the above-mentioned problems, and even if an error occurs in the liquid level detection unit, it prevents the liquid from overflowing from the storage unit and can appropriately control the fiber concentration. The purpose is to provide.

In order to achieve the above object, the waste paper processing apparatus according to the present invention is provided in a storage unit for storing a fiber-containing liquid obtained by stirring waste paper with water, and the storage unit is provided with the fiber content from the storage unit. The control includes a take-out unit for taking out the liquid, a liquid level detection unit for detecting the liquid level of the fiber-containing liquid stored in the storage unit, and a control unit for controlling the fiber-containing liquid to be subjected to a predetermined treatment. The unit processes the fiber-containing liquid based on at least one of the detection result of the liquid level detection unit and the amount of the fiber-containing liquid taken out from the extraction unit.

Further, in the above configuration, when the amount of the fiber-containing liquid taken out from the storage unit reaches a predetermined amount while the liquid level detection unit maintains the state where the liquid level is present, the control unit is the storage unit. It is judged that the liquid level of the fiber-containing liquid stored in the fiber falls below a predetermined value.

Further, in each of the above configurations, the withdrawal amount is the driving amount of the take-out pump for taking out the fiber-containing liquid from the storage part, and at least one of the fiber-containing liquid or the water supplied to the storage part. Includes values obtained from at least one of the measured values of a flow meter that measures the flow rate of.

Further, in each of the above configurations, a supply unit for supplying the liquid to the storage unit is provided, and the control unit processes the liquid based on the supply amount of the liquid supplied from the supply unit to the storage unit.

Further, in the configuration, when the liquid level detecting unit keeps the state of no liquid level and the supply amount of the liquid to the storage unit reaches a predetermined amount, the control unit supplies the storage unit. It is determined that the liquid level of the stored fiber-containing liquid exceeds the installation position of the liquid level detection unit.

Further, in each of the above configurations, the supply amount is at least a measured value of a supply pump that supplies the liquid to the storage unit and a flow meter that measures the flow rate of the liquid supplied to the storage unit. Contains values obtained from either.

Further, in each of the above configurations, the control unit processes the fiber-containing liquid based on the residual amount of the fiber-containing liquid remaining in the storage unit.

Further, in the above configuration, the control unit supplies the residual amount and at least one of the fiber-containing liquid and the water to the storage unit while the liquid level detection unit maintains the liquid level. When the amount obtained by subtracting the withdrawal amount from the total supply amount from the supply unit reaches a predetermined amount, the liquid level of the fiber-containing liquid stored in the storage unit falls below the installation position of the liquid level detection unit. Judge.

Further, in each of the above configurations, the control unit is supplied to the storage unit and the driving amount of the supply pump that supplies the liquid to the storage unit while the liquid level detection unit maintains the state with the liquid level. From the total value of the value obtained from at least one of the measured values of the flow meter for measuring the flow rate of the liquid and the residual amount, the driving amount of the take-out pump and the flow rate of the liquid taken out from the storage unit are measured. When the value obtained by subtracting the value obtained from at least one of the measured values of the flow meter reaches a predetermined value, it is determined that the pulp liquid stored in the storage unit has fallen below the installation position of the liquid level detection unit.

Further, in the above configuration, in the control unit, the amount obtained by subtracting the withdrawal amount from the total of the residual amount and the supply amount reaches a predetermined amount while the liquid level detection unit maintains the state of no liquid level. When this is done, it is determined that the liquid level of the fiber-containing liquid stored in the storage unit exceeds the installation position of the liquid level detection unit.

Further, in each of the above configurations, the control unit is supplied to the storage unit and the driving amount of the supply pump that supplies the liquid to the storage unit while the liquid level detection unit maintains the state of no liquid level. The flow rate for measuring the driving amount of the take-out pump and the flow rate of the liquid taken out from the storage unit from the total value of the value obtained from at least one of the measured values of the flow meter for measuring the flow rate of the liquid and the residual amount. When the value obtained by subtracting the value obtained from at least one of the measured values of the meter reaches a predetermined value, the liquid level of the fiber-containing liquid stored in the storage unit exceeds the installation position of the liquid level detection unit. Judge that

Further, in each of the above configurations, the liquid level detection unit includes a capacitance type sensor.

Further, in the above configuration, the liquid level detection unit includes a float type sensor.

According to the waste paper processing apparatus according to the present invention, the control unit contains the fiber based on at least one of the detection result of the liquid level detection unit and the extraction amount of the fiber-containing liquid taken out from the extraction unit. Since the liquid is processed, even if an error occurs in the liquid level detection unit, it is possible to prevent the liquid from overflowing from the storage unit, and the fiber concentration can be appropriately controlled.

Further, the control unit is stored in the storage unit when the amount of the fiber-containing liquid taken out from the storage unit reaches a predetermined amount while the liquid level detection unit maintains the state with the liquid level. When it is determined that the liquid level of the fiber-containing liquid has fallen below a predetermined value, the liquid level of the storage unit can be appropriately determined when an error occurs in the liquid level detection unit.

Then, the withdrawal amount measures the driving amount of the take-out pump for taking out the fiber-containing liquid from the storage part, and the flow rate of at least one of the fiber-containing liquid or the water supplied to the storage part. When a value obtained from at least one of the measured values of the flow meter is included, the liquid level in the storage unit can be determined more appropriately when an error occurs in the liquid level detection unit.

Further, when the control unit includes a supply unit for supplying the liquid to the storage unit and processes the liquid based on the supply amount of the liquid supplied from the supply unit to the storage unit, the control unit detects the liquid level. When an error occurs in the unit, the liquid level in the storage unit can be properly determined.

Further, the control unit stores the liquid in the storage unit when the supply amount of the liquid to the storage unit reaches a predetermined amount while the liquid level detection unit maintains the state of no liquid level. When it is determined that the liquid level of the fiber-containing liquid exceeds the installation position of the liquid level detection unit, it is possible to more appropriately determine the liquid level of the storage unit when an error occurs in the liquid level detection unit.

Further, the supply amount is obtained from at least one of the driving amount of the supply pump that supplies the liquid to the storage unit and the measured value of the flow meter that measures the flow rate of the liquid supplied to the storage unit. If a value is included, the liquid level in the storage unit can be determined more appropriately when an error occurs in the liquid level detection unit.

In addition, when processing the fiber-containing liquid based on the residual amount of the fiber-containing liquid remaining in the storage unit, the control unit more appropriately determines the liquid level of the storage unit when an error occurs in the liquid level detection unit. It is possible.

Further, the control unit is a supply unit that supplies at least one of the fiber-containing liquid and the water to the residual amount and the storage unit while the liquid level detection unit maintains the state with the liquid level. When it is determined that the liquid level of the fiber-containing liquid stored in the storage unit has fallen below the installation position of the liquid level detection unit when the amount obtained by subtracting the withdrawal amount from the total supply amount from the above reaches a predetermined amount. Can more appropriately determine the liquid level in the storage unit when an error occurs in the liquid level detection unit.

Further, in the control unit, the driving amount of the supply pump that supplies the liquid to the storage unit and the flow rate of the liquid supplied to the storage unit while the liquid level detection unit maintains the state with the liquid level. The measured value of the flow meter that measures the driving amount of the take-out pump and the flow rate of the liquid taken out from the storage unit from the total value of the value obtained from at least one of the measured values of the flow meter that measures When it is determined that the pulp liquid stored in the storage unit has fallen below the installation position of the liquid level detection unit when the value obtained by subtracting the value obtained from at least one of the above reaches a predetermined value, an error occurs in the liquid level detection unit. When this occurs, the liquid level in the storage section can be judged more appropriately.

Further, when the amount obtained by subtracting the withdrawal amount from the total of the residual amount and the supply amount reaches a predetermined amount while the liquid level detection unit maintains the state of no liquid level, the control unit said. When it is determined that the liquid level of the fiber-containing liquid stored in the storage unit exceeds the installation position of the liquid level detection unit, the liquid level of the storage unit can be determined more appropriately when an error occurs in the liquid level detection unit. Is.

Further, in the control unit, the value obtained by subtracting the value obtained from the drive amount of the take-out pump from the total value obtained from the measured values of the flow meter while the liquid level detection unit maintains the state of no liquid level. When it is determined that the liquid level of the fiber-containing liquid stored in the storage unit exceeds the predetermined value when the value reaches a predetermined value, the liquid level of the storage unit is more appropriate when an error occurs in the liquid level detection unit. It is possible to judge.

Further, when the liquid level detection unit includes a capacitance type sensor, it is possible to more appropriately determine the liquid level of the storage unit when an error occurs in the capacitance type sensor.

Further, when the liquid level detection unit includes a float type sensor, the float type sensor can prevent the liquid from overflowing from the storage unit.

It is a structural schematic diagram of the waste paper processing apparatus which concerns on one Embodiment of this invention. It is a perspective view of the waste paper supply part and the pulp production part of the waste paper processing apparatus. It is a front view of the waste paper supply part and the pulp manufacturing part. It is a vertical sectional view of the waste paper supply part and the pulp production part. It is a perspective view of the deinking part of the waste paper processing apparatus. It is a front view of the deinking part. It is a top view of the deinking part. It is a vertical sectional view of the deinking part. It is a block diagram of the papermaking part of the waste paper processing apparatus. It is a front view of the waste liquid processing part of the waste paper processing apparatus. It is a block diagram of the control part of the waste paper processing apparatus. It is a flow chart of the control part of the waste paper processing apparatus. It is a flow chart of the control part of the waste paper processing apparatus. It is a flow chart of the control part of the waste paper processing apparatus. It is a flow chart of the control part of the waste paper processing apparatus. It is a flow chart of the control part of the waste paper processing apparatus. It is a flow chart of the control part of the waste paper processing apparatus. It is a flow chart of the control part of the waste paper processing apparatus. It is a flow chart of the control part of the waste paper processing apparatus. It is a flow chart of the control part of the waste paper processing apparatus. It is a flow chart of the control part of the waste paper processing apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of the used paper processing apparatus 1. The waste paper processing device 1 includes a waste paper supply unit 2, a waste paper processing unit 20, and a control unit 8. The used paper processing unit 20 applies a predetermined process to the used paper U. The control unit 8 controls the operations of the waste paper supply unit 2 and the waste paper processing unit 20. The control unit 8 controls the waste paper processing unit 20 so as to perform a predetermined treatment on the fiber-containing liquid obtained by stirring the waste paper U with water.

In the present embodiment, a case will be described in which the waste paper processing unit 20 is a papermaking apparatus that dissociates the waste paper U to produce a fiber-containing liquid and papers the obtained fiber-containing liquid to produce recycled paper R. The waste paper processing unit 20 includes a pulp manufacturing unit 3, a dilution unit 4, a deinking unit 5, a papermaking unit 6, a finishing unit 7, and a waste liquid processing unit 9.
Although it is not relevant this time, there is no drying part as a used paper processing device.
In addition, there is no line that supplies water to the deinking section without passing through the paper making section.

Between the pulp manufacturing section 3 and the diluting section 4, between the deinking section 5 and the paper making section 6, between the paper making section 6 and the pulp manufacturing section 3, between the paper making section 6 and the diluting section 4, the deinking section 5 and the waste liquid treatment. The 1st-7th pumps 11-17 are installed between the parts 9, between the valve 133 and the waste liquid treatment part 9, and in the waste liquid treatment part 9. Each of the 1st-7th pumps 11-17 constitutes the take-out pump of the present invention.

The first pump 11 takes out the fiber-containing liquid from the stirring tank 29 of the pulp manufacturing unit 3 as a storage unit. The second pump 12 takes out the fiber-containing liquid from the deinking treatment unit 54 as a storage unit. Each of the third and fourth pumps 13 and 14 takes out the fiber-containing liquid from the white water tank 66 as a storage portion. The fifth pump 15 takes out the fiber-containing liquid from the agglomerate portion 55 as the storage portion. The sixth pump 16 takes out the fiber-containing liquid from the deinking processing unit 54 as a storage unit via the valve 133. The seventh pump 17 takes out the waste liquid as the fiber-containing liquid from the waste liquid tank 92 as the storage unit.

Further, the first to sixth pumps 11 to 16 all constitute the supply pump of the present invention. The first pump 11 supplies the fiber-containing liquid to the deinking treatment unit 54 as a storage unit via the dilution unit 4. The second pump 12 supplies the fiber-containing liquid to the white water tank 66 as a storage unit. The third pump 13 supplies the fiber-containing liquid or water to the stirring tank 29 as the storage unit. The fourth pump 14 supplies the fiber-containing liquid or water to the deinking treatment unit 54 as the storage unit via the dilution unit 4. The fifth and sixth pumps 15 and 16 supply the fiber-containing liquid to the waste liquid tank 92 as a storage unit.

As the types of the 1st-7th pumps 11-17, any of positive displacement type, non-positive displacement type and special type may be used. Therefore, the 1st-7th pumps 11-17 are tube pumps, centrifugal pumps, swirl pumps, turbine pumps, axial flow pumps, mixed flow pumps, cascade pumps, piston pumps, flanger pumps, diaphragm pumps, wing pumps, gear pumps, and eccentricity. Pumps, screw pumps, snake pumps, etc. can be installed. Of these, it is preferable to use a tube pump. By using a tube pump, the fiber-containing liquid can be transferred to the downstream side at a predetermined timing without installing a valve. When another pump is used instead of the tube pump, a valve is provided in the middle of the pipe.

Further, the waste paper processing apparatus 1 includes a 1-4th flow meter 121-124. All of the first to fourth flowmeters 121 to 124 constitute the flowmeter of the present invention. The first flow meter 121 measures the flow rate of at least one of the fiber-containing liquid and water supplied to the stirring tank 29 as a storage unit. The second flow meter 122 measures the flow rate of at least one of the fiber-containing liquid and water supplied to the deinking processing unit 54 as a storage unit. The third flow meter 122 measures the flow rate of water supplied to the white water tank 66 as a storage unit. The fourth flow meter 124 measures the flow rate of water supplied to the deinking processing unit 54 as a storage unit.

As the first and second flow meters 121 and 122, either a volumetric flow meter or a mass flow meter can be used. Specifically, as the first and second flowmeters 121 and 122, a vortex type, a positive displacement type, a turbine type, a Coriolis type, an ultrasonic type, an electromagnetic type, an area type, a differential pressure type and the like can be used.

(Waste paper supply department)
FIG. 2 is a perspective view of the waste paper supply unit 2 and the pulp production unit 3, FIG. 3 is a front view of the waste paper supply unit 2 and the pulp production unit 3, and FIG. 4 is an internal structure of the waste paper supply unit 2 and the pulp production unit 3. It is a vertical sectional view which shows. The used paper supply unit 2 includes a used paper accommodating unit 24 and a measuring unit 25. The used paper storage unit 24 stores the used paper U.

(Pulp Manufacturing Department)
The pulp manufacturing unit 3 stirs the used paper U with water to produce a pulp liquid. This pulp liquid constitutes a fiber-containing liquid. The fiber-containing liquid is a liquid containing fibers obtained by stirring the used paper U with water. The pulp production unit 3 includes a stirring tank 29, a first supply unit 28, a stirring means 31, and a liquid level detecting unit 68.

The stirring tank 29 adds water to the used paper U and stirs it. The stirring tank 29 constitutes a storage unit for storing the fiber-containing liquid. The shape and size of the stirring tank 29 are not particularly limited, but from the viewpoint of good stirring efficiency, it is preferable to use a stirring tank 29 having a bottom and a substantially cylindrical or polygonal tubular shape. FIG. 2-4 shows, as an example, a case where the stirring tank 29 is formed in a regular octagonal tubular shape. Further, from the viewpoint of disassembly processing efficiency and miniaturization of the apparatus, the stirring tank 29 has an inner diameter of about 30 mm to 2000 mm, more preferably about 300 mm to 1500 mm, and a capacity of about 0.4 L to 5000 L, more preferably about 7 L to 100 L. You can use the same one.

As shown in FIG. 2-4, a plurality of baffle plates 33 are provided on the inner wall surface of the stirring tank 29. The shape, installation position, and number of the baffle plate 33 are not particularly limited as long as they appropriately stir the liquid stored in the stirring tank 29 and suppress the rotation of the stirring blade 41 while entraining air. In FIG. 3-5, as an example, a baffle plate 33 formed in a triangular columnar shape is projected at a plurality of locations on the inner wall surface which is substantially the central portion in the height direction of the stirring tank 29.

A pulp liquid extraction portion 34 is provided at the bottom of the stirring tank 29. The pulp liquid take-out part 34 constitutes the take-out part of the present invention. The pulp liquid extraction unit 34 is provided in the stirring tank 29 as a storage unit, and the fiber-containing liquid is taken out from the storage unit. The fiber-containing liquid contains fibers, water, and the like. The fiber-containing liquid is produced by stirring the used paper U together with water inside the stirring tank 29 and dissociating it.

One end of the pipe 101 is connected to the pulp liquid extraction unit 34. A first pump 11 is installed in the middle of the pipe 101. The opening 32 of the pulp liquid extraction unit 34 is provided with a foreign matter outflow suppressing portion 38 that suppresses the foreign matter mixed in the stirring tank 29 from being sent to the downstream side.

The foreign matter outflow suppressing portion 38 includes a erection member 39 that is bridged from one point on the peripheral edge of the circular opening 32 of the pulp liquid extraction portion 34 to another point. The shape of the erection member 39 is not particularly limited, and can be formed into a rod shape, a columnar shape, a prismatic shape, a spherical shape, a lump shape, or the like. Of these, it is preferable to form the pulp liquid in a rod shape, a columnar shape, or a prismatic shape in that the pulp liquid can easily pass through the pulp liquid extraction unit 34 in which the foreign matter outflow suppressing unit 38 is installed and can be transferred to the downstream side.

Further, it is preferable that the shaft diameter of the erection member 39 is formed smaller than a predetermined value. The erection member 39 may be one or a plurality of erection members 39. When a plurality of erection members 39 are installed, they may be installed in a cross shape, intersected at a predetermined angle, or may be installed in parallel. Among these, it is particularly preferable that the erection member 39 is arranged in the diameter direction of the opening 32 of the pulp liquid extraction portion 34 in that foreign matter can be efficiently locked and the outflow to the downstream side can be suppressed. ..

Further, a foreign matter extraction portion 37 is provided at the bottom of the stirring tank 29. When a foreign matter that is difficult to dissociate is mixed in the mixed liquid stored in the stirring tank 29, the foreign matter taking-out unit 37 takes out such a foreign matter. The foreign matter taking-out portion 37 is provided at a position different from the installation location of the pulp liquid taking-out portion 34 at the bottom of the stirring tank 29. A lid 40 is provided in the opening 30 of the foreign matter taking-out portion 37. The lid 40 closes the foreign matter taking-out portion 37 during the disintegration treatment of the used paper U, and after the pulp liquid produced by the disintegration treatment is taken out from the pulp liquid taking-out portion 34, the opening 30 is opened to open the foreign matter. A mixed solution of water and water can be made to flow into the foreign matter taking-out portion 37.

The first supply unit 28 is provided on the upper side wall of the stirring tank 29. The first supply unit 28 constitutes the supply unit of the present invention. The first supply unit 28 supplies at least one of water such as tap water and white water as a fiber-containing liquid to the stirring tank 29 as a storage unit. One end of the pipe 103 shown in FIG. 1 is connected to the first supply unit 28. The other end of the pipe 103 is connected to the white water tank 66 of the papermaking section 6. A third pump 13 is installed in the middle of the pipe 103. Further, a first flow meter 121 and a first valve 131 are installed in the pipe 103. Although not shown, the first supply unit 28 or the pipe 103 may be configured to separately connect a pipe for supplying purified water such as tap water.

In addition, a deinking agent supply unit 26 is installed on the upper side wall of the stirring tank 29. The deinking agent supply unit 26 is installed next to the first supply unit 28. The deinking agent supply unit 26 supplies the deinking agent required for the deinking process in the deinking unit 5 in the subsequent stage.

The stirring means 31 includes a stirring shaft 42, a driving unit 43, and a stirring blade 41. The stirring shaft 42 is installed at a substantially central position in a plan view of the stirring tank 29. A pulley 46 for transmitting power is installed on the upper part of the stirring shaft 42, and is connected to the drive unit 43 by the belt 47 and the pulley 48.

The drive unit 43 includes a motor. The drive unit 43 rotationally drives the stirring shaft 42 via a power transmission mechanism 45 including a belt 47 and pulleys 46 and 48, and rotationally drives the stirring blade 41 in both forward and reverse directions.
The stirring blade 41 is installed in the lower part of the stirring tank 29. The stirring blade 41 stirs and dissociates the used paper U together with the water supplied from the first supply unit 28. The stirring blade 41 is fixed to the lower part of the stirring shaft 42.

The installation height of the stirring blade 41 in the stirring tank 29 depends on the size of the stirring tank 29, but is preferably provided at a position of about 10 mm to 100 mm from the bottom surface of the stirring tank 29. By setting the position of the stirring blade 41 higher than 10 mm from the bottom surface of the stirring tank 29, the used paper U can be easily slipped under the stirring blade 41 during the disintegration process, and the used paper U is cut by the stirring blade 41. Therefore, waste paper pulp can be easily produced. Further, by lowering the position of the stirring blade 41 from the bottom surface of the stirring tank 29 to less than 100 mm, when a small amount of used paper U is dissociated, the stirring blade 41 is a mixed liquid containing water from the used paper U and the first supply unit 28. The height is set so that it can be immersed in the inside, and the rotation of the stirring blade 41 while entraining air can be prevented.

The thickness of the stirring blade 41 is preferably about 0.3 mm to 10 mm, more preferably about 0.5 mm to 7 mm. When the thickness of the stirring blade 41 is 0.3 mm or more, liquids such as used paper U and water stored in the stirring tank 29 can be sufficiently agitated, and when the thickness is 10 mm or less, the used paper U is agitated. The wing 41 can efficiently cut the pulp liquid.

The liquid level detection unit 68 detects the liquid level in the stirring tank 29. The liquid level detection unit 68 installed in the stirring tank 29 constitutes the liquid level detection unit of the present invention. The liquid level detection unit 68 detects the liquid level of the pulp liquid as the fiber-containing liquid stored in the stirring tank 29 as the storage unit. The liquid level detection unit 68 includes a first liquid level detection unit 681, a second liquid level detection unit 682, and a third liquid level detection unit 683. The first liquid level detection unit 681 is installed above the stirring tank 29. The first liquid level detection unit 681 detects the liquid level when the maximum amount of liquid that can be stored in the stirring tank 29 is stored.

The second liquid level detection unit 682 is installed at a medium height that is slightly lower than half the height of the side wall of the stirring tank 29. The second liquid level detecting unit 682 detects the liquid level at which it is difficult to satisfactorily stir the pulp liquid by the stirring blade 41 in a state where the fiber concentration is very high.

The third liquid level detection unit 683 is provided at substantially the same height as the installation position of the stirring blade 41. If the liquid level is lower than the installation position of the third liquid level detection unit 683, the pulp liquid cannot be agitated and the fibers in the pulp liquid precipitate.

The 1-3 liquid level detection unit 681-683 can be used as a capacitance type, an ultrasonic type, an electrode type, a differential pressure type, an optical type, a laser type, a vibration type or the like. Of these, the capacitance type, which is easy to maintain, has hard durability, and is inexpensive, is preferable.

(Diluted part)
The diluting section 4 is provided between the pulp manufacturing section 3 and the deinking section 5. In the diluting section 4, the diluting liquid is added to the pulp liquid flowing in the pipe 101. The dilution unit 4 includes a second supply unit 44. The second supply unit 44 constitutes the supply unit of the present invention. The second supply unit 44 supplies at least one of water or white water as a fiber-containing liquid to the deinking treatment unit 54 as a storage unit by supplying the diluted solution in the dilution unit 4.

The second supply unit 44 is connected to the white water tank 66 by a pipe 104. A fourth pump 14 is installed in the middle of the pipe 104. Further, a second flow meter 122 and a second valve 132 are installed in the pipe 104. The second flow meter 122 does not necessarily have to be installed, and can be omitted. A pipe (not shown) for supplying purified water such as tap water may be separately connected to the second supply unit 44 or the pipe 104.

(Ink removal department)
5 is a perspective view of the deinked portion 5, FIG. 6 is a front view of the deinked portion 5, FIG. 7 is a plan view, and FIG. 8 is a cross-sectional view taken along the line AA of FIG. The deinking unit 5 deinks the pulp liquid. The deinking unit 5 includes a deinking tank 51 and an inflow unit 56.

The deinking tank 51 is formed in a substantially cylindrical shape with a bottom. The deinking tank 51 includes a deinking processing unit 54, an air supply unit 58, a blade 53, a foam receiving unit 73, an agglomeration unit 55, and a deinking liquid extraction unit 57. The deinking processing unit 54 is formed in a substantially U-shape in a plan view. The deinking treatment unit 54 is provided on the outside of the agglomeration unit 55. The agglomerating portion 55 is provided at a substantially central portion in a plan view of the deinking tank 51.
The deinking processing unit 54 constitutes the storage unit of the present invention. The deinking treatment unit 54 stores a pulp liquid as a fiber-containing liquid. In the deinking processing unit 54, the pulp liquid is deinked. The air supply unit 58 is installed below the deinking processing unit 54. The air supply unit 58 supplies air into the deinking processing unit 54.

The blade 53 is installed above the deinking tank 51. The blade 53 is rotated by driving the motor 555. The blade 53 is rotated about the center of the deinking tank 51 having a substantially circular plan view. The blade 53 attracts the foam generated by the deinking treatment. The foam receiving portion 73 receives the foam attracted by the blade 53 and guides the foam to the agglomerating portion 55.

The agglomerating portion 55 contains the foam that has been attracted by the blade 53. The aggregating portion 55 is provided with an adding portion 551, a stirring blade 552, an agglomerating liquid detecting portion 553, and an taking-out portion 554. Addition 551 adds a flocculant to the foam. The stirring blade 552 is rotated by driving the motor 555. The driving force of the motor 555 is switched so as to rotate individually with the blade 53 and the stirring blade 552 by a switching mechanism (not shown). The stirring blade 552 stirs the foam together with the flocculant. From this, the foam is defoamed and aggregated. Then, the foam becomes a coagulated liquid having a predetermined viscosity. The agglomerate is a fiber-containing liquid containing fibers.

The coagulation liquid detection unit 553 detects the liquid level of the coagulation unit 55. The coagulated liquid detection unit 553 constitutes the liquid level detection unit of the present invention. The coagulation liquid detection unit 553 detects the liquid level of the coagulation liquid as the fiber-containing liquid stored in the coagulation unit 55 as the storage unit.

The coagulating liquid taking-out portion 554 is provided at the bottom of the coagulating portion 55. The coagulating liquid take-out portion 554 is connected to the pipe 105. A fifth pump 15 is installed in the middle of the pipe 105. When the fifth pump 15 is driven, the coagulating liquid is taken out from the coagulating portion 55. The coagulation liquid take-out part 554 constitutes the take-out part of the present invention. The coagulation liquid take-out unit 554 is provided in the coagulation part 55 as a storage part, and takes out the coagulation liquid as a fiber-containing liquid from the storage part.

The deinking liquid extraction unit 57 is provided at the bottom of the deinking processing unit 54. The deinking liquid extraction unit 57 takes out the pulp liquid after the deinking treatment. The deinking liquid extraction unit 57 constitutes the extraction unit of the present invention. The deinking liquid extraction unit 57 is provided in the deinking processing unit 54 as a storage unit, and takes out the deinked pulp liquid as a fiber-containing liquid from the storage unit. A pipe 102 is connected to the deinking liquid extraction unit 57. A second pump 12 and a third valve 133 are installed in the middle of the pipe 102. The liquid in the deinking processing unit 54 is taken out by driving the second pump 12. The third valve 133 is composed of a three-way valve. By switching the third valve, the liquid flowing through the pipe 102 flows into the pipe 106. The pipe 106 is connected to the waste liquid treatment unit 9. A sixth pump 16 is installed in the pipe 106.

The inflow portion 56 is installed outside the upper part of the deinking tank 51. The inflow unit 56 causes the pulp liquid to flow into the deinking processing unit 54. The inflow unit 56 and the deinking processing unit 54 are communicated with each other by a communication unit 561. The inflow unit 56 is provided with a deinking liquid detecting unit 59 for detecting the liquid level of the pulp liquid. The deinking liquid detection unit 59 constitutes the liquid level detection unit of the present invention. The deinking liquid detecting unit 59 detects the liquid level of the pulp liquid as the fiber-containing liquid stored in the deinking processing unit 54 as a storage unit. The control unit 8 predicts the liquid level of the deinking processing unit 54, which is substantially the same as the liquid level of the pulp liquid in the inflow unit 56 detected by the deinking liquid detecting unit 59.

In the deinking processing unit 54, it becomes difficult to detect the liquid level due to the presence of bubbles. However, by predicting the liquid level of the deinking processing unit 54 from the liquid level of the inflow unit 56, the liquid level of the deinking processing unit 54 can be appropriately grasped.

Further, the deinking processing unit 54 is provided with a supply unit 70 for supplying purified water such as tap water. One end of the pipe 110 is connected to the supply unit 70. The other end of the pipe 110 is connected to a source of purified water. A fourth flow meter 124 is installed in the pipe 110.

(Paper machine)
FIG. 9 is a schematic configuration diagram of the papermaking section 6. The papermaking section 6 includes a head box 61, a wire section 62, a dehydration section 63, a drying section 64, and a white water tank 66. The head box 61 includes a holding portion 611, an inflow portion 614, and an outflow portion 615. The holding portion 611 is formed in a box shape. The inflow portion 614 is provided below the holding portion 611. A pipe 102 is connected to the inflow portion 614. The pipe 102 is connected to the lower part of the holding portion 611. The outflow section 615 causes the pulp liquid to overflow from the holding section 611 and flow out to the wire section 62.

The wire portion 62 includes a drawing net 621. The paper net 621 is composed of an endless mesh belt and is hung on a plurality of rollers 622. In the figure, the roller 622a on the right side is connected to the wire drive unit 623, and the drawing net 621 circulates around the wire drive unit 623.

The pulp liquid is discharged from the outflow portion 615 of the head box 61 on the upper surface of the drawing net 621 and drained by the drawing net 621 to form a wet paper W forming a fiber layer. Inside the drawing net 621, a water receiving portion 624 for receiving water flowing down from the mesh of the drawing net 621 running on the upper side is provided. The water receiving portion 624 is connected to the white water tank 66 so as to guide the received water to the white water tank 66.

The dehydration section 63 has a water absorption belt 631. The water absorption belt 631 is made of felt or the like, and is hung on a plurality of rollers 632 and press rollers 634b. The water absorption belt 631 conveys the wet paper W transferred from the drawing net 621 and dehydrates the wet paper W.

The drying unit 64 has a drying belt 641, a canvas 642, and a drying roller 643. The drying belt 641 conveys the wet paper W transferred from the water absorbing belt 631. The drying belt 641 is hung on a roller 645, a press roller 634a, and a drying roller 643.

A dehydration means 633 is provided at a contact portion between the water absorption belt 631 and the drying belt 641. The dehydration means 633 is composed of a pair of press rollers 634a and 634b, and the pair of press rollers 634a and 634b presses the wet paper W sandwiched between the water absorption belt 631 and the drying belt 641 to dehydrate. The wet paper W that has passed through the dehydrating means 633 is transferred from the water absorbing belt 631 to the drying belt 641.

In FIG. 9, the upper press roller 634a is connected to the press drive unit 637 and rotates by the drive of the press drive unit 637, and the lower press roller 634b is driven to rotate with the rotation of the upper press roller 634a. Then, as both the press rollers 634a and 634b rotate, the water absorption belt 631 and the drying belt 641 run.

The canvas 642 is made of a net-like resin, is hung on a plurality of rollers 646, and is stretched. The canvas 642 sandwiches and conveys the wet paper W with the drying belt 641, and the wet paper W is pressed against the drying roller 643 via the drying belt 641 to be dried. In FIG. 9, the upper roller 646a on the right side is connected to the canvas drive unit 647, and the canvas 642 orbits the canvas drive unit 647.

The drying roller 643 is rotatably supported by a plurality of support shafts 650. A heating means 648 is provided inside the drying roller 643. As the heating means 648, an electric heater or the like can be used. Further, the drying roller 643 is provided with a contact type temperature sensor 649, and the surface temperature of the drying roller 643 is detected by the temperature sensor 649.

The white water tank 66 stores purified water or white water. The white water tank 66 is connected to the water receiving portion 624. The water receiving unit 624 constitutes a supply unit that supplies white water to the white water tank 66. Further, the white water tank 66 is provided with a supply unit 65 for supplying purified water such as tap water. One end of the pipe 107 is connected to the supply unit 65. The other end of the pipe 107 is connected to a source of purified water. A third flow meter 123 is installed in the pipe 107. Further, at the bottom of the white water tank 66, a take-out portion 67 for taking out a liquid of either white water or purified water stored in the white water tank 66 is provided. A pipe 103 is connected to the take-out portion 67.

Further, a white water detection unit 69 is installed in the white water tank 66. The white water detection unit 69 detects the level of purified water or white water in the white water tank 66. The white water detection unit 69 constitutes the liquid level detection unit of the present invention. The white water detection unit 69 detects the liquid level of white water as a fiber-containing liquid stored in the white water tank 66 as a storage unit. The white water detection unit 69 includes a first white water detection unit 691, a second white water detection unit 692, and a third white water detection unit 693. The second white water detection unit 692 is installed at a medium height that is slightly lower than half the height of the side wall of the white water tank 66. The third white water detection unit 693 is installed in the lower part of the white water tank 66. The first to third white water detection units 691 to 693 can use the same sensors as the first to third liquid level detection units 681 to 683 installed in the stirring tank 29. Further, the first white water detection unit 691 can also be configured by a float sensor.

(Finishing part)
The finishing portion 7 shown in FIG. 1 has a calendar portion and a cut portion (not shown), the calendar portion includes a plurality of press rollers (not shown) for increasing the flatness of the paper, and the cut portion specifies the paper. It is equipped with a cutting blade (not shown) that cuts to the sheet size of.
(Waste liquid treatment unit)
The waste liquid treatment unit 9 is provided below the deinking unit 5. The waste liquid treatment unit 9 performs a process of separating solids such as fibers from the coagulated liquid transferred from the deinking unit 5. The waste liquid treatment unit 9 includes a filtration unit 91, a waste liquid tank 92, and a fiber storage box 94. The filtration unit 91 filters the aggregated liquid and squeezes it. 10 and 11 show a case where the filtration unit 91 includes, for example, a screw press 97 and a net 96. However, the filtration unit 91 is not limited to this, and may be provided with other mechanisms such as a dehydration roll and a centrifuge device in place of these.

The waste liquid tank 92 contains the waste liquid which is a liquid separated from the coagulated liquid in the filtration unit 91. The waste liquid contains fibers that have passed through the net 96. The waste liquid tank 92 is provided with a waste liquid detection unit 95. The waste liquid detection unit 95 detects the liquid level of the waste liquid tank 92. The waste liquid detection unit 95 constitutes the liquid level detection unit of the present invention. The waste liquid detection unit 95 detects the liquid level of the waste liquid as the fiber-containing liquid stored in the waste liquid tank 92 as the storage unit.

The waste liquid detection unit 95 includes a first waste liquid detection unit 951 and a second waste liquid detection unit 952. The first waste liquid detection unit 951 and the second waste liquid detection unit 952 are installed vertically separated by a predetermined amount. The first waste liquid detection unit 951 is installed above the waste liquid tank 92. The first waste liquid detection unit 951 detects that the waste liquid has reached the upper limit. The second waste liquid detection unit 952 is installed in the lower part of the waste liquid tank 92. The second waste liquid detection unit 952 is installed at a position lower than that of the first waste liquid detection unit 95. The second waste liquid detection unit 952 detects that the liquid level of the waste liquid tank 92 has reached a predetermined value to be discharged to the outside of the apparatus. The fiber containing box 94 contains the fiber-containing material that has been filtered and pressed by the screw press 97.

Further, a pipe 108 is connected to the waste liquid tank 92. Purified water such as tap water is supplied from the pipe 108. A seventh pump 17 is installed in the pipe 108. By driving the seventh pump 17, the waste liquid in the waste liquid tank 92 is discharged from the pipe 108 to the outside of the device.

(Control unit)
The control unit 8 includes a CPU 81, a storage unit, and the like, and controls the operations of the used paper supply unit 2, the pulp production unit 3, the deinking unit 5, the papermaking unit 6, and the finishing unit 7. As shown in FIG. 11, the control unit 8 includes a used paper supply function unit 810, a pulp production function unit 811, a deinking function unit 812, a papermaking function unit 813, and a finishing function unit 814 as functional circuits to be set in the CPU 81.

The used paper supply function unit 810 controls the operation of the used paper supply unit 2. The pulp production function unit 811 controls the operation of the pulp production unit 3. The deinking function unit 812 controls the operation of the deinking unit 5. The papermaking function unit 813 controls the operation of the papermaking unit 6. The finishing function unit 814 controls the operation of the finishing unit 7.

Further, the control unit 8 includes an automatic function unit 816, a playback function unit 821, a cleaning function unit 822, an operation preparation function unit 823, a stop preparation function unit 824, and an error response function unit 825 as other functional circuits to be set in the CPU 81. Have.

The automatic function unit 816 sequentially executes the steps from the start of operation to the stop of operation. The reproduction function unit 821 controls the operation of regenerating the used paper U. Before or after the reclaiming process, the cleaning function unit 822 mainly uses white water or purified water in the white water tank to connect the pulp manufacturing unit 3, the deinking unit 5, the paper making unit 6, the finishing unit 7, and the pipes, valves, etc. connecting them. It supplies the constituent cleaning liquid and controls the operation of cleaning processing. The cleaning liquid is a fiber-containing liquid containing fibers. The operation preparation function unit 823 performs the preparation operation of the used paper processing device 1. The stop preparation function unit 824 prepares for stopping the operation of the used paper processing apparatus 1.

The error handling function unit 825 predicts whether or not an error has occurred in the liquid level detection unit based on the liquid level detection result of the liquid level detection unit. Then, the error handling function unit 825 controls the liquid level detection unit to perform a predetermined treatment on at least one of the fiber-containing liquid and the water when it is predicted that an error has occurred. At that time, the error handling function unit 825 executes the subsequent processing based on the amount of the liquid taken out from the storage unit, the amount remaining in the storage unit, the amount supplied to the storage unit, and the like.

The error handling function unit 825 processes at least one of the fiber-containing liquid and the purified water based on at least one of the detection result of the liquid level detection unit and the amount of the fiber-containing liquid taken out from the take-out unit. The error response function unit 825 stores the fiber-containing liquid in the storage unit when the amount of the fiber-containing liquid taken out from the storage unit reaches a predetermined amount while the liquid level detection unit maintains the liquid level. It is judged that the liquid level of is below the predetermined value. This withdrawal amount includes a value obtained from at least one of the drive amount of the take-out pump for taking out the fiber-containing liquid from the storage part and the measured value of the flow meter for measuring the flow rate of the liquid supplied to the storage part.

The error response function unit 825 processes the liquid based on the supply amount of at least one of the fiber-containing liquid and the purified water supplied from the supply unit to the storage unit. The error response function unit 825 is a fiber-containing liquid stored in the storage unit when the supply amount of the liquid to the storage unit reaches a predetermined amount while the liquid level detection unit maintains the state of no liquid level. It is judged that the place exceeds the predetermined value. This supply amount includes a value obtained from at least one of the driving amount of the supply pump that supplies the liquid to the storage unit and the measured value of the flow meter that measures the flow rate of the liquid supplied to the storage unit. ..

The error handling function unit 825 processes the fiber-containing liquid based on the residual amount of the fiber-containing liquid remaining in the storage unit. The error response function unit 825 determines the amount of supply from the supply unit that supplies at least one of the fiber-containing liquid and water to the residual amount and the storage unit while the liquid level detection unit maintains the state with the liquid level. When the amount obtained by subtracting the withdrawal amount from the total reaches a predetermined amount, it is determined that the liquid level of the fiber-containing liquid stored in the storage unit has fallen below the predetermined value.

The error response function unit 825 is a value obtained from at least one of the driving amount of the supply pump that supplies the liquid to the storage unit and the measured value of the flow meter that measures the flow rate of the liquid supplied to the storage unit. When the value obtained by subtracting the value obtained from the driving amount of the take-out pump from the total value with the residual amount reaches a predetermined value, it is determined that the pulp liquid stored in the storage unit has fallen below the predetermined amount.

The error response function unit 825 is stored in the storage unit when the amount obtained by subtracting the withdrawal amount from the total of the residual amount and the supply amount reaches a predetermined amount while the liquid level detection unit maintains the state of no liquid level. It is judged that the liquid level of the fiber-containing liquid exceeds a predetermined value. The error response function unit 825 is a value obtained by subtracting the value obtained from the drive amount of the take-out pump from the total value obtained from the measured values of the flow meter while the liquid level detection unit maintains the state of no liquid level. When reaches a predetermined value, it is determined that the liquid level of the fiber-containing liquid stored in the storage unit exceeds the predetermined value.

(Operation control)
The control from the start to the stop of the operation by the control unit 8 as described above is performed according to the flow sheet shown in FIG. That is, from the stopped state 900, the operation of the used paper processing apparatus 1 is stopped 960 through the steps of the preparation operation 910, the supply operation of the used paper U 920, the regeneration operation 930, the cleaning process 940, and the operation stop preparation 950.

The preparatory operation 910 is executed when the user turns on the power of the waste paper processing apparatus 1. In the preparatory operation 910, as shown in FIG. 14, 911 in which purified water is injected into the white water tank 66. When the purified water can be directly supplied from the first supply unit 28 to the stirring tank 29 without going through the white water tank 66, the operation of the water injection 911 into the white water tank 66 can be omitted. Further, the water injection 911 into the white water tank 66 may be executed after the user performs the operation of starting the waste paper processing. As a result, it is possible to prevent the white water tank 66 from being continuously filled with water when the used paper processing or the cleaning process is not started immediately after the power is turned on.

Next, when the used paper U as a raw material is stored in the used paper accommodating unit 24 shown in FIG. 2, the used paper supply function unit 810 measures the amount of the used paper U by the measuring unit 25. The measuring unit 25 measures the total weight of the used paper U and the used paper accommodating unit 24 by the weight measuring device. The weight of the used paper U alone can be calculated by subtracting the preset weight of the used paper accommodating portion 24 from the measured value of the weight measuring device. The preparatory operation function unit 823 calculates the operation stop time from the weight of the used paper U and displays it on the operation panel 913.

In the waste paper U supply operation, when the user performs an operation for starting the recycling process of the waste paper U, the waste paper supply function unit 810 slides the bottom plate 27 to press the bottom portion of the waste paper storage unit 24 as the waste paper input port. 921 to open. The used paper supply function unit 810 is left as it is until a predetermined time elapses after the bottom plate 27 is opened.

Then, it waits for the used paper U in the used paper accommodating portion 24 to fall into the lower stirring tank 29 due to its own weight. The operation of supplying the used paper U to the stirring tank 29 is now complete. When the bottom plate 27 is opened to the full open at a time, the supply time of the used paper U is relatively short. By adjusting the length of sliding the bottom plate 27 in the horizontal direction, the used paper U stored in the used paper accommodating portion 24 may be supplied to the stirring tank 29 in a plurality of times.

After supplying the used paper U to the stirring tank 29, the weight of the empty used paper accommodating unit 24 is measured again by the measuring unit 25. By taking the difference between the measured values before and after the used paper is supplied, the amount of the used paper U actually supplied to the stirring tank 29 can be obtained. Then, 923 to confirm the presence or absence of a supply error of the used paper U.

When the value obtained by the waste paper supply function unit 810 by measuring the weight of the waste paper storage unit 24 in an empty state where the waste paper U is not stored is equal to or more than a preset predetermined value, the waste paper supply function unit 810 uses the waste paper U. It is judged that the supply of That is, even if the bottom plate 27 is opened, if there is used paper U that remains in the used paper accommodating portion 24 without being dropped due to its own weight, the weight of the used paper accommodating portion 24 becomes heavier than in the empty state.

Further, when the position of the bottom plate 27 in the waste paper accommodating portion 24 is configured to be detectable, the waste paper supply function unit 810 is such that the waste paper U is sandwiched between the bottom plate 27 and the side wall when the bottom plate 27 cannot be completely closed. Therefore, it can be determined that the used paper U has not been properly supplied to the stirring tank 29. 924.

In such a case, the used paper supply function unit 810 slides the bottom plate 27 in the opening direction again. From this, the waste paper U tries to fall again due to its own weight. 925. When the waste paper U housed in the upright state by the first sliding operation of the bottom plate 27 is sandwiched between the bottom plate 27 and the like, the waste paper U is folded in half. Eyes are formed and so on. Therefore, the used paper U can be reliably dropped by opening the bottom plate 27 again.

Further, when the power of the used paper processing device 1 is turned off during the opening of the bottom plate 27 or with the bottom plate 27 closed, the measured value of the used paper U measured before the opening of the bottom plate 27 is stored in the storage unit. .. After that, when the power is turned on and the restoration operation or the preparation operation is executed, the bottom plate 27 is opened and closed, and then the paper weight is remeasured. The input amount can be calculated from the difference between the stored measured value and the remeasured value.

In the used paper recycling operation 930 shown in FIG. 13, the pulp manufacturing function section 811, the deinking function section 812, the paper making function section 813, and the finishing function section 814 are used to finish the pulp manufacturing section 3, the deinking section 5, and the paper making section 6, respectively. The waste paper U is regenerated by controlling the unit 7.

The control unit 8 starts the reproduction operation of the used paper U by the reproduction function unit 821. The regeneration function unit 821 supplies 941 the amount of liquid for dissociation required for the dissociation process from the first supply unit 28 to the stirring tank 29 based on the measured values of the measurement unit 25 by the pulp production function unit 811. The liquid for disintegration supplied from the first supply unit 28 is a fiber-containing liquid or purified water in the white water tank 66. The liquid stored in the white water tank 66 is supplied to the stirring tank 29 by driving the third pump 13. At that time, the reproduction function unit 821 opens the first valve 131. As the liquid supplied from the first supply unit 28, purified water supplied from the water supply source may be used instead of the supply from the white water tank 66. The flow rate of water supplied from the first supply unit 28 to the stirring tank 29 is measured by the first flow meter 121.

Then, the regeneration function unit 821 drives the drive unit 43 by the pulp production function unit 811, so that the stirring shaft 42 is rotated via the power transmission mechanism 45. With the rotation of the stirring shaft 42, the stirring blade 41 is rotated in a predetermined direction for a predetermined time 942. As a result, the used paper U stored in the stirring tank 29 is stirred together with water and dissociated to obtain a pulp liquid. The pulp liquid is a fiber-containing liquid containing fibers.

After the disintegration process is completed, the reproduction function unit 821 supplies the deinking agent from the deinking agent supply unit 26 943. Then, the regeneration function unit 821 starts the first dilution process 944. In the dilution process, the regeneration function unit 821 supplies the diluted solution from the first supply unit 28 to the stirring tank 29. The diluent is white water or purified water stored in the white water tank 66. Therefore, the reproduction function unit 821 drives the third pump 13. The white water in the white water tank 66 is a fiber-containing liquid containing fibers. The diluent may be purified water supplied from a water supply source instead of white water or purified water supplied from the white water tank 66.

The flow rate of the diluent supplied from the first supply unit 28 to the stirring tank 29 is measured by the first flow meter 121. The measured value of the first flow meter 121 is stored in the storage unit. After that, when the first liquid level detection unit 681 detects the liquid level of the pulp liquid, the regeneration function unit 821 determines that the first dilution treatment has been completed. Then, the regeneration function unit 821 stops the supply of the diluent. In the first dilution treatment, the regeneration function unit 821 adjusts the fiber concentration of the pulp liquid to be the first concentration.

Then, the reproduction function unit 821 drives the first pump 11. 945, in which the pulp liquid having the first concentration is taken out from the pulp liquid take-out unit 34 by driving the first pump 11. The taken-out Pulv liquid is transferred to the dilution section 4 on the downstream side.

The drive amount of the first pump 11 is stored in the storage unit. The regeneration function unit 821 predicts the amount of pulp liquid taken out from the stirring tank 29 from the driving amount of the first pump 11. The storage unit stores in advance the amount of pulp liquid taken out from the stirring tank 29 corresponding to the driving amount of the first pump 11.

The regeneration function unit 821 confirms whether or not the pulp liquid has dropped to the second liquid level, which is the installation position of the second liquid level detection unit 682. When a predetermined amount of pulp liquid is taken out from the pulp liquid extraction unit 34, the pulp liquid in the stirring tank 28 drops to the second liquid level. At this time, the second liquid level detection unit 682 detects the liquid level and changes from the presence or absence of the pulp liquid. Upon receiving the change in the detection signal of the second liquid level detection unit 682, the regeneration function unit 821 determines that the extraction of the pulp liquid at the first concentration is completed. Then, the regeneration function unit 821 starts the second dilution treatment with respect to the pulp liquid having the first concentration remaining in the stirring tank 29. 947. Even during this second dilution, the regeneration function unit 821 continues to drive the first pump 11 and continues to take out the pulp liquid from the stirring tank 29.

In the second dilution treatment in the stirring tank 29, the regeneration function unit 821 supplies the stirring tank 29 with a predetermined amount of the diluted solution set in advance from the first supply unit 28. Therefore, the reproduction function unit 821 drives the third pump 13. The amount of the diluent actually supplied to the stirring tank 29 is measured by the first flow meter 121 and stored in the storage unit.

The pulp liquid is further diluted by the second dilution treatment in the stirring tank 29 to raise the liquid level. From this, the pulp liquid is put into a state where it can be appropriately stirred by the stirring blade 41. Dilution gradually reduces the fiber concentration of the pulp liquor and also the viscosity of the pulp liquor. Therefore, it becomes easier to transfer to the downstream side by driving the first pump 11.

Upon the second dilution, the regeneration function unit 821 stops the supply of the diluent when it determines from the measured values of the first flow meter 121 that a predetermined amount of the diluent has been supplied to the stirring tank 29. The amount of the diluent supplied at the time of the second dilution is changed to the measured value of the first flow meter 121, and for example, the drive of the third pump 13 for supplying the diluent from the white water tank 66 to the stirring tank 29. It may be predicted based on the amount. In addition, a fourth liquid level detection unit 684 may be installed to determine the completion of the dilution treatment. In this case, the completion of the two dilution treatments can be determined based on the detection result of the fourth liquid level detection unit 684.

The regeneration function unit 821 continues to drive the first pump 11 even after the supply of the diluent is stopped. After that, when the liquid level of the stirring tank 29 was lowered by the pulp liquid take-out operation and the second liquid level detection unit 682 changed from the presence or absence of the pulp liquid again, the regeneration function unit 821 started the third dilution. To do. Similarly, every time the second liquid level detection unit 682 changes from the presence or absence of the pulp liquid, the operation of supplying a predetermined amount of the diluted liquid is repeated.

It is preset that the operation of supplying the predetermined amount of the diluent to the stirring tank 29 is performed a predetermined number of times. After the completion of the dilution operation a predetermined number of times, the pulp liquid in the stirring tank 29 continues to be taken out even after 948. When the liquid level of the stirring tank 29 falls below the installation position of the second liquid level detection unit 682 and then reaches the third liquid level, which is the installation position of the third liquid level detection unit 683, the third liquid level detection unit 683 becomes pulp. 949 that changes from with liquid to without liquid. At this time, the regeneration function unit 821 determines that substantially all the pulp liquid to be taken out from the stirring tank 29 has been taken out. Then, the reproduction function unit 821 stops the first pump 11 at 950.

In the diluting unit 4, the diluting liquid is added to the pulp liquid taken out from the pulp manufacturing unit 3. The diluent is white water or purified water stored in the white water tank 66. The regeneration function unit 821 opens the second valve 132 and drives the fourth pump 14. The white water in the white water tank 66 is a fiber-containing liquid containing fibers. The diluent may be white water supplied from the white water tank 66 or purified water supplied from a water source instead of purified water.

By diluting the pulp liquid in the dilution unit 4, the pulp liquid is adjusted to a predetermined fiber concentration suitable for deinking. The amount of the diluent added at each step is stored in advance in the storage unit. After the start of the two dilution treatments in the stirring tank 29, the fiber concentration of the pulp liquid in the stirring tank 29 gradually decreases. Along with this, the amount of the diluent added to the pulp liquid in the dilution unit 4 is gradually reduced.

As described above, in the diluting section 4, the amount of the diluting solution added to the pulp solution is adjusted according to the fiber concentration of the pulp solution, so that the fiber concentration of the pulp solution flowing into the deinking section 5 is increased. It is possible to maintain a predetermined fiber concentration suitable for deinking.

In the deinking section 5, the pulp liquid flows into the deinking processing section 54 from the inflow section 56. Then, the deinking process is performed 932. At that time, air is supplied from the air supply unit 58 to the pulp liquid contained in the deinking processing unit 54. The liquid level of the pulp liquid of the deinking processing unit 54 is managed based on the detection result of the deinking liquid detecting unit 59 installed in the inflow unit 56.

The foam floating on the upper part of the deinking processing unit 54 by the deinking treatment is attracted to the foam receiving portion 73 by the blade 53. The foam attracted to the foam receiving portion 73 moves to the central portion of the stirring tank 51 and flows into the agglomerating portion 55.

The coagulant is added from the addition part 551 to the foam flowing into the agglomeration part 55 at a predetermined timing. Then, the stirring blade 552 is rotated over a predetermined time. From this, the foam is aggregated and becomes an aggregated liquid. The timing of adding the coagulant can be, for example, after a lapse of a predetermined time from the start of the deinking treatment, or after the coagulant detection unit 553 detects the liquid level of the foam. The stirring blade 552 may be used for defoaming by being rotated before the addition of the coagulant, may be constantly rotated before and after the addition of the coagulant, or may be intermittently rotated.

When the liquid level of the coagulant or foam reaches the installation position of the coagulant detection unit 553, it is detected by the coagulant detection unit 553. The regeneration function unit 821 drives the fifth pump 15 when the coagulant liquid detection unit 553 changes from no liquid level to yes after the addition of the coagulant. It is also possible to constantly drive the fifth pump 15. By constantly driving the fifth pump 15, the agglomerate portion 55 can be maintained in an empty state. By driving the fifth pump 15, the coagulated liquid is taken out from the coagulated liquid take-out unit 554. The extracted coagulated liquid is transferred to the waste liquid treatment unit 9.

The coagulated liquid sent to the waste liquid treatment unit 9 is filtered by the filtration unit 91. The waste liquid separated from the coagulated liquid by filtration is stored in the waste liquid tank 92. When the waste liquid detection unit 95 detects the liquid level of the waste liquid in the waste liquid tank 92, the seventh pump 17 is driven for a predetermined time. A predetermined amount of waste liquid is discharged to the outside of the apparatus by driving the seventh pump 17. The screw press 97 is constantly rotated after the coagulated liquid flows into the waste liquid treatment unit 9. The solid content is squeezed by the rotation of the screw press 97 to become a fiber-containing material, which is stored in the fiber storage box 94. The fiber-containing material in the fiber-containing box 94 is discarded by the user.

When the deinking liquid detecting unit 59 detects the liquid level, the regenerating function unit 821 determines that the deinking process is completed. Then, the reproduction function unit 821 drives the second pump 12. As a result, the deinked pulp liquid obtained by the deinking treatment is taken out from the deinking liquid extraction unit 57 and sent to the papermaking unit 6 on the downstream side. When the control unit determines the completion of the deinking process, the drive time of the first pump 11 may reach a predetermined time instead of the detection result of the deinking liquid detection unit 59. By using the detection result of the deinking liquid detecting unit 59, the liquid level of the deinking processing unit 54 can be adjusted even when the first pump 11 cannot properly transfer the pulp liquid due to air mixing or the like. Can be grasped accurately.

In the papermaking section 6, the deinked pulp liquid flows into the head box 61. Then, the pulp liquid is supplied from the outflow portion 615 to the upper surface of the drawing net 621 to form a wet paper W which is a uniform fiber layer 933. The water flowing down from the drawing net 621 is received by the water receiving portion 624 and stored in the white water tank 66.

The white water contained in the white water tank 66 is subjected to separation of ink, toner and the like, addition of chemicals, neutralization treatment and the like, if necessary. The liquid level of the white water tank 66 is detected by the white water detection unit 69. When the diluent 4 requires a diluent, the fourth pump 14 is driven and the second valve 132 is opened. Further, the flow rate of the diluent is measured by the second flow meter 122. The white water is sent to the dilution unit 4 and reused as a diluent. Further, when the pulp manufacturing unit 3 requires a liquid or a diluent for disintegration, the first valve 131 is opened and the third pump 13 is driven. From this, the white water is circulated to the pulp production section 3. White water is supplied from the first supply unit 28 to the stirring tank 29.

The wet paper W formed on the paper net 621 shown in FIG. 9 is transferred to the water absorption belt 631 at the contact portion between the paper net 621 and the water absorption belt 631, and the moisture contained in the wet paper W by the water absorption belt 631. Is absorbed and dehydrated. When the wet paper W reaches the installation location of the dehydration means 633, the wet paper W is sandwiched between the water absorption belt 631 and the drying belt 641 and is pressed from both sides by a pair of press rollers 634a and 634b to be dehydrated. At the same time, it is transferred from the water absorption belt 631 to the drying belt 641.

The wet paper W transferred to the drying belt 641 is sandwiched between the wet paper W and the canvas 642, and in this state, is pressed against the drying roller 643 via the drying belt 641 and dried. The surface temperature of the drying roller 643 is detected by the temperature sensor 649 and is maintained at a predetermined temperature set in advance based on the detection result.

The recycled paper R before finishing leaving the drying portion 64 is passed between a plurality of press rollers (not shown), thereby improving the flatness of the recycled paper R before finishing, and further, a predetermined sheet size with a cutting blade. Recycled paper R is completed by cutting into.

The wet paper W that has been made and dried in the final stage in the paper making section 6 is not acquired as the recycled paper R in the finishing section 7, but is cut smaller than the size of the recycled paper R.

(Washing operation)
After the recycling operation 930 of the used paper U, the cleaning function unit 822 cleans the inside of the apparatus 940. During the cleaning process of the stirring tank 29, the cleaning function unit 822 supplies the white water or purified water in the white water tank 66 as a cleaning liquid from the first supply unit 28 to the stirring tank 29. When the first liquid level detection unit 681 detects the liquid level of the cleaning liquid, the cleaning function unit 822 stops the supply of the cleaning liquid. The timing for stopping the supply of the cleaning liquid may be when the second liquid level detection unit 682 detects the liquid level instead of the liquid level detection by the first liquid level detection unit 681. This makes it possible to save the cleaning liquid.

After that, the cleaning function unit 822 rotates the stirring blade 41 in the forward and reverse directions. From this, the inside of the stirring tank 29 is washed. The cleaning liquid after use becomes cleaning waste liquid. The cleaning waste liquid is a fiber-containing liquid containing fibers. The cleaning waste liquid is taken out from the pulp liquid take-out unit 34. The taken-out cleaning waste liquid is sent to the waste liquid treatment unit 9 via the deinking unit 5, and the waste liquid treatment is sequentially performed and discarded.

If necessary, the regeneration function unit 821 controls to supply the white water or purified water in the white water tank 66 as a liquid for dissociation from the first supply unit 28 to the stirring tank 29 for the next regeneration operation after the cleaning treatment. You may go. By using the white water in the white water tank 66 as the liquid for the next disintegration, the white water can be effectively used and water can be saved. In addition, the supply time of the liquid for disintegration at the start of the next disassembly process can be shortened.

When cleaning the deinking unit 5, the cleaning function unit 822 supplies the deinking tank 51 with white water or purified water in the white water tank 66 as a cleaning liquid. At that time, the cleaning function unit 822 drives the fourth pump 14. The cleaning liquid flows through the pipe 104, flows into the pipe 101 via the second valve 132 and the dilution unit 4, and is sent to the deinking tank 51. When the deinking liquid detecting unit 59 detects the liquid level of the cleaning liquid, the cleaning function unit 822 stops the fourth pump 14. The cleaning liquid is in a state where the deinking tank 51 is fully filled. After that, air is supplied from the air supply unit 58 for a predetermined time. The fibers adhering to the inner wall of the deinking tank 51 are washed with a washing liquid. In addition, instead of cleaning the deinking tank 51 with white water or purified water in the white water tank 66, the cleaning function unit 822 uses purified water such as tap water supplied from the supply unit 70 to clean the deinking tank 51. May be washed. The flow rate of the cleaning liquid supplied from the supply unit 70 to the deinking tank 51 is measured by the fourth flow meter 124.

All the cleaning waste liquid generated by the cleaning treatment is taken out from the deinking liquid extraction unit 57. The cleaning waste liquid taken out from the deinking processing unit 54 by driving the second pump 12 is transferred from the pipe 102 to the waste liquid treatment unit 9 via the pipe 106 by switching the third valve 133.

Further, if necessary, the cleaning function unit 822 ejects the cleaning liquid from above toward the air supply unit 58 after the cleaning liquid is taken out from the deinking tank 51. As a result, it is possible to finish the deinking process in a state where the air supply hole of the air supply unit 58 is clogged with fibers or the like, and prevent the fibers from drying and causing clogging.

After the deinking liquid detecting unit 59 detects the liquid level of the cleaning liquid, the cleaning function unit 822 may continue to drive the fourth pump 14 for a predetermined time. As a result, the cleaning liquid flows from the deinking treatment unit 54 into the agglomeration unit 55. By rotating the stirring blade 552, the inner wall and bottom surface of the aggregating portion 55, the agglomerating liquid detecting portion 553, and the like can be cleaned. If necessary, a coagulant may be added from the addition unit 551 to coagulate the cleaning waste liquid. The cleaning waste liquid of the agglomerating unit 55 is transferred to the waste liquid treatment unit 9 by driving the fifth pump 15, and is treated with the waste liquid.

Further, the cleaning liquid is sprayed toward the inner wall of the agglomerating portion 55. If necessary, the stirring blade 552 is rotated. After that, the generated cleaning waste liquid is sent from the coagulation liquid extraction unit 554 to the waste liquid treatment unit 9 for treatment.

When cleaning the papermaking unit 6, the cleaning function unit 822 rotates the second pump 12 in the reverse direction. Then, the pulp liquid remaining in the holding portion 611 at the end of the regeneration operation is returned to the pipe 102. This is because the pulp liquid just before the end of the regeneration operation is withdrawn from the head box 61 to empty the inside of the head box 61. If the bottom of the head box 61 is provided with an opening for extracting pulp liquid, the final pulp liquid in the head box 61 may be extracted through this opening. The pulp liquid returned from the head box 61 to the pipe 102 is sent to the waste liquid treatment unit 9 through the pipe 106 by switching the third valve 13.

After the pulp liquid remaining in the holding portion 611 is extracted, the cleaning function portion 822 uses the inner wall of the holding portion 611 of the head box 61, the inflow portion 613 and the outflow portion 615, the drawing net 621, the water absorption belt 631, and the press. The cleaning liquid of white water or purified water in the white water tank 66 is sprayed onto the rollers 634a, 634b and the like. From this, the head box 61, the wire portion 62, and the dehydration portion 63 are cleaned. The generated cleaning waste liquid is sent to the waste liquid treatment unit 9 via the pipe 102, the third valve 133, and the pipe 106 in the same manner as the residual pulp liquid.

The cleaning treatment can be performed before the regenerating operation of the used paper U or at the same time as the regenerating operation of the used paper U. When the cleaning process is performed before the recycling operation of the used paper U, the residual water of the pumps 11 to 16 and the pipes 101 to 105 is cleaned with purified water before and after the preparatory operation 910 or at the same time as the preparatory operation 910. .. The generated cleaning waste liquid is discharged to the outside of the device. As a result, the quality of the obtained recycled paper R can be maintained in a higher state.

When the cleaning process is performed simultaneously with the recycling operation of the used paper U, the operating time of the apparatus can be shortened. When the cleaning process of the pulp manufacturing unit 3 is performed at the same time as the recycling operation of the used paper U, the inner wall of the stirring tank 29 and the stirring blade 41 are cleaned immediately after the pulp liquid is taken out from the stirring tank 29. Completion of taking out the pulp liquid from the stirring tank 29 is determined based on the detection of the liquid level by the third liquid level detection unit 683. When the pulp manufacturing unit 2 is washed during the regeneration operation in this way, the fibers remaining in the stirring tank 29 can be removed more effectively.

When the cleaning process of the deinking portion 5 is performed simultaneously with the regenerating operation of the used paper U, it is started after all the pulp liquid is taken out from the deinking tank 51 to the downstream side. At this timing, the cleaning function unit 822 drives the fourth pump 14. The cleaning liquid is supplied to the deinking tank 51 to clean the inside.

When the cleaning process of the paper making portion 6 is performed at the same time as the recycling operation of the used paper U, the washing of the paper making portion 6 is started at the same timing as the cleaning of the deinking portion 5. At this time, the cleaning function unit 822 rotates the second pump 12 in the reverse direction to remove all the pulp liquid remaining in the holding unit 611. After that, with the rear end portion of the wet paper W completely transferred from the wire portion 62 and the dehydration portion 63 to the drying portion 64, the cleaning function unit 822 sprays the cleaning liquid onto each part of the papermaking unit 6.

While the rear end portion of the wet paper W that can be manufactured as recycled paper R is still being dried by the drying portion 64, the recycling operation of the used paper U and the cleaning treatment of a part of the papermaking portion 6 are performed at the same time. ..

When the recycling operation 930 of the used paper U and the cleaning process 940 of each part are all completed, the stop preparation unit 824 moves to the stop preparation 950. In the stop preparation 950, an operation of stopping the energization of the heating means 648 is performed. Then, it is determined whether or not the surface temperature of the drying roller 643 measured by the temperature sensor 649 has become equal to or lower than the set temperature.

In this way, the control unit 8 controls the pulp manufacturing unit 3, the deinking unit 5, and the papermaking unit 6 by the cleaning function unit 822, and performs the cleaning process to keep each part of the apparatus in a clean state at all times. As a result, the quality of recycled paper can be maintained.

(Response when an error occurs)
Next, the measures to be taken when the liquid level detection unit cannot detect the liquid level properly due to some trouble will be described below. In the recycling operation of the used paper U, at the time of the first dilution treatment of the pulp manufacturing unit 3, the recycling function unit 821 determines the completion of dilution to the first concentration based on the liquid level detection of the first liquid level detecting unit 681. .. Then, the regeneration function unit 821 stops the supply of the diluted solution from the first supply unit 28. When the first liquid level detection unit 681 does not operate normally for some reason and the liquid level of the pulp liquid cannot be detected, the error handling function unit 825 grasps the occurrence of an error and responds to it.

When an error occurs in the first liquid level detection unit 681, the error response function unit 825 prepares the pulp liquid based on the supply amount of at least one of white water and purified water supplied from the first supply unit 28 to the stirring tank 29. To process. Examples of the treatment at this time include a dilution treatment with a diluent. The error handling function unit 825 determines whether or not to stop the dilution process based on the amount of liquid supplied.

The supply amount of the pulp liquid can be, for example, an integrated value of the flow rate per unit time from a predetermined time point. As the predetermined time point, various timings such as the start time of the dilution treatment and the start time of the disintegration treatment can be used.

As shown in FIG. 18, the error handling function unit 825 confirms whether or not the first liquid level detection unit 681 has no liquid level 971 after the start of supply of the diluted liquid to the stirring tank 29. When the first liquid level detection unit 681 detects that there is a liquid level, the supply of the diluent is stopped 974. 973 for confirming whether or not the supply amount of the diluted solution has reached a predetermined amount when the first liquid level detecting unit 681 maintains the state of no liquid level. If the supplied amount of the diluted solution has not reached the predetermined amount, the process returns to the monitoring of the first liquid level detection unit 681. When the supply amount of the diluent reaches a predetermined amount, the error handling function unit 825 determines that the liquid level of the pulp liquid stored in the stirring tank 29 exceeds the predetermined value. Then, the supply of the diluent is stopped 974. The threshold value of the supply amount can be the same as the amount required to add the diluent to the pulp liquid at the start of the dilution treatment up to the installation position of the first liquid level detection unit 681.

The error handling function unit 825 monitors the measured value of the first flow meter 121 during the dilution process. Then, when the measured value of the first flow meter 121 reaches a predetermined value set in advance, the liquid level of the pulp liquid in the stirring tank 29 becomes the first even if the first liquid level detecting unit 681 does not detect the liquid level. 1 It is determined that the installation position of the liquid level detection unit 681 has been reached. Therefore, even if an error occurs in the liquid level detection unit, it is possible to prevent the concentration of the fiber-containing liquid from becoming too thick or too thin, and the fiber concentration can be appropriately controlled.

The threshold value of the supply amount for determining the error of the liquid level detection unit 68 may be set to be larger than the required amount of the diluent. The threshold value of the supply amount can be a value obtained by adding a predetermined amount such as 10 L to the amount required for adding the diluent to the installation position of the liquid level detection unit 68. Further, the amount may be increased by a predetermined ratio such as 1% with respect to the required amount of the diluted solution.

The amount of liquid supplied is from at least one of the driving amount of the third pump 13 that supplies the liquid to the stirring tank 29 and the measured value of the first flow meter 121 that measures the flow rate of the liquid supplied to the stirring tank 29. The value obtained is included. The error response function unit 825 monitors the presence or absence of the liquid level detection of the first liquid level detection unit 681, and continues the dilution process with the first liquid level detection unit 681 not detecting the liquid level. When the measured value of the first flow meter 121 reaches a predetermined value larger than the required amount of diluted liquid, it is determined that an error has occurred in the first liquid level detection unit 121. Then, the completion of the dilution process is determined based on the measured value of the first flow meter 121. By adjusting the set value of the supply amount in this way, the first liquid level detection unit 681 is preferentially used, and when an error occurs in the first liquid level detection unit 681, the measured value of the first flow meter 121 is used. It is controllable to do.

Alternatively, the completion of dilution may be determined based only on the first flow meter 121. In that case, when the measured value of the first flow meter 121 reaches a predetermined value, the error handling function unit 825 determines that the dilution process is completed regardless of the presence or absence of the liquid level detection of the first liquid level detecting unit 681.

Further, although both the first liquid level detection unit 681 and the first flow meter 121 are used, the measured value of the first flow meter 121 may be used in preference to the first liquid level detection unit 681. That is, usually, the completion of dilution is determined based on the measured value of the first flow meter 121. When an error occurs in the first flow meter 121 and the first liquid level detection unit 681 detects the liquid level before the measured value of the first flow meter 121 reaches the preset value as the required diluted liquid amount, this It is also possible to judge that the dilution is completed based on.

In place of or in addition to the measured value of the first flow meter 13, the error handling function unit 825 monitors the drive amount of the third pump 13, and the drive amount of the third pump 13 reaches a preset predetermined value. It is also possible to determine that the liquid level of the pulp liquid in the stirring tank 29 has reached the installation position of the first liquid level detection unit 681. At this time, it is possible to prioritize any of the detection result of the first liquid level detection unit 681, the measured value of the first flow meter 121, and the drive amount of the third pump 13. Further, when at least one of these determines that the liquid level has reached the installation position of the first liquid level detection unit 681, the subsequent processing can be performed.

If an error occurs in the second liquid level detection unit 682 in addition to the first liquid level detection unit 681 during the first dilution treatment, the following measures are taken. When the measured value of the first flow meter 121 or the drive amount of the third pump 13 reaches a predetermined value without the pulp liquid in the second liquid level detection unit 682, the error response function unit 825 moves the first liquid level detection unit 681. Both the second liquid level detection unit 682 and the second liquid level detection unit 682 determine that an error has occurred. Then, the error handling function unit 825 shifts to the next process. As the next process, the error handling function unit 825 starts taking out the pulp liquid having the first concentration.

When the first liquid level detection unit 681 detects the presence of pulp liquid while the second liquid level detection unit 682 has detected the absence of pulp liquid, the error response function unit 825 has the first liquid level detection unit 681. The liquid level is properly detected, and the second liquid level detection unit 682 determines that an error has occurred. In this case, the error handling function unit 825 performs the subsequent processing on the assumption that the liquid level of the stirring tank 29 is at the installation position of the first liquid level detecting unit 681.

When the pulp liquid having the first concentration is taken out from the stirring tank 29 after the first dilution treatment, the regeneration function unit 821 is based on the detection signal that the second liquid level detection unit 682 has changed from the presence or absence of the pulp liquid. , It is judged that the extraction of the pulp liquid having the first concentration is completed. At this time, even though the second liquid level detection unit 682 could not detect the liquid level in the stirring tank 29 and the liquid level of the pulp liquid was lower than the installation height of the second liquid level detection unit 682, the liquid level was not detected. If the detection signal is not transmitted to the control unit 8, the second dilution process cannot be started at an appropriate timing.

In this way, when the second liquid level detection unit 682 does not operate normally for some reason and the liquid level of the pulp liquid cannot be detected, the error response function unit 825 grasps the occurrence of an error and responds to this. .. At the time of this extraction process, the error handling function unit 825 is based on at least one of the detection result of the second liquid level detection unit 682 and the extraction amount of the pulp liquid taken out from the pulp liquid extraction unit 34. Start the second dilution process.

As shown in FIG. 19, the error handling function unit 825 confirms whether or not the second liquid level detection unit 682 has a liquid level 981 after the start of the extraction process from the stirring tank 29. When the second liquid level detection unit 682 detects that there is no liquid level, the second dilution process is started 984. 983 to confirm whether the amount of pulp liquid taken out from the stirring tank 29 has reached a predetermined amount when the second liquid level detection unit 682 maintains the state of having a liquid level. If the amount of pulp liquid taken out has not reached a predetermined amount, the process returns to monitoring by the second liquid level detection unit 682. When the amount to be taken out reaches a predetermined amount, it is determined that the liquid level of the pulp liquid stored in the stirring tank 29 has fallen below the predetermined value. Then, the dilution process is started 984. This withdrawal amount includes a value obtained from the driving amount of the first pump 11 for taking out the pulp liquid from the stirring tank 29.

The error handling function unit 825 predicts the amount of pulp liquid to be taken out by using the driving amount of the first pump 11. The error handling function unit 825 grasps the amount of pulp liquid in the stirring tank 29 by sequentially subtracting the predicted amount of pulp liquid from the remaining amount of pulp liquid in the stirring tank 29 at the start of taking out.

As shown in FIG. 21, the error handling function unit 825 confirms whether or not the second liquid level detection unit 682 has a liquid level 1001 after the start of the extraction process from the stirring tank 29. When the second liquid level detection unit 682 detects that there is no liquid level, the third dilution treatment is started 1004. 1003 for confirming whether or not the current residual amount from the stirring tank 29 has reached a predetermined amount when the second liquid level detecting unit 682 maintains the state with the liquid level. The residual amount at the present time is the sum of the residual amount at a predetermined time point such as the start time of the second dilution treatment and the supply amount of the diluted solution from the first supply unit 28 from the predetermined time point, and from the predetermined time point. It is obtained by subtracting the withdrawal amount of. If the remaining amount at the present time does not reach the predetermined amount, the process returns to the monitoring of the second liquid level detection unit 682. When the residual amount reaches a predetermined amount, it is determined that the liquid level of the pulp liquid stored in the stirring tank 29 has fallen below the predetermined value. Then, the third dilution treatment is started 1004.

The error response function unit 825 has a second liquid level detection unit 682 when the drive amount of the first pump 11 reaches a predetermined value set in advance while the second liquid level detection unit 682 does not detect the liquid level. Judge that a detection error has occurred. At this time, it is expected that the amount of pulp liquid in the stirring tank 29 is less than the position where the second liquid level detection unit 682 is installed. Then, the error handling function unit 825 executes the second dilution process and starts supplying the diluted solution to the stirring tank 29. As a result, even if the second liquid level detection unit 682 cannot properly detect the liquid level, the dilution treatment can be performed.
Start dilution after the second time

At the time of the second and subsequent dilutions, the error handling function unit 825 grasps the supply amount of the diluent from the measured value of the first flow meter 121 and the drive amount of the third pump 13 as in the first time. Further, in the second and subsequent dilution treatments, the error handling function unit 825 grasps the residual amount of the pulp liquid stored in the stirring tank 29 at a predetermined time point, and dilutes the pulp liquid based on this. The error handling function unit 825 predicts the amount of pulp liquid to be taken out by using the driving amount of the first pump 11 from a predetermined time point. The predetermined time point can be used at the start time of the second or first dilution treatment, the start time of the extraction treatment, the start time of the disintegration treatment, or the like.

The completion of the second dilution treatment is determined based on the measured value of the first flow meter 121 or the driving amount of the third pump 13. Instead of these, a liquid level detection unit for determining the completion of the dilution treatment may be separately installed. In this way, when the fourth liquid level detection unit 684 is installed to determine the completion of the second and subsequent dilution treatments, the error response function unit 825 causes the error occurrence of the fourth liquid level detection unit 684 as follows. Grasp and respond.

The error response function unit 825 supplies the diluent based on the residual amount of the pulp liquid in the stirring tank 29 at the predetermined time, the supply amount of the diluent to the stirring tank 29 from the predetermined time, and the withdrawal amount of the pulp liquid from the predetermined time. Perform the process. At a predetermined time point, some timings can be set as described above. For example, the predetermined time point can be the time point at which the second dilution treatment is started.

As shown in FIG. 20, the error handling function unit 825 confirms whether or not the fourth liquid level detection unit 684 has no liquid level 991 after the start of the second supply of the diluted liquid to the stirring tank 29. When the fourth liquid level detection unit 684 detects that there is a liquid level, the supply of the diluent is stopped 994. 993 to confirm whether the supplied amount of the diluted solution has reached a predetermined amount when the fourth liquid level detecting unit 684 keeps the state of no liquid level. From the total of the residual amount of pulp liquid at the start of the second dilution treatment and the amount of liquid supplied from the first supply unit 28 from the start of the second dilution treatment, while maintaining the state of no liquid level. 973 to confirm whether the remaining amount at the present time obtained by subtracting the amount taken out from the pulp liquid taking-out unit 34 from the start of the second dilution treatment has reached a predetermined amount.

When the current residual amount reaches a predetermined amount, the error handling function unit 825 determines that the liquid level of the pulp liquid stored in the stirring tank 29 has exceeded the predetermined value. The error response function unit 825 supplies the diluted solution obtained from the measured value of the first flow meter 121 or the driving amount of the third pump 13 while the fourth liquid level detecting unit 684 maintains the state of no liquid level. When the value obtained by subtracting the withdrawal amount obtained from the drive amount of the first pump 11 from the total value of the above reaches a predetermined value, it is determined that the liquid level of the pulp liquid stored in the stirring tank 29 exceeds the predetermined value. From this, it can be determined that the two dilution treatments are completed.

After the completion of the second dilution, the pulp liquid is continuously taken out, and when the liquid level drops to the installation position of the second liquid level detection unit 682, the third dilution treatment is started. In the error response function unit 825, the residual amount of the pulp liquid in the stirring tank 29 at a predetermined time point and the supply amount of the diluted liquid from the predetermined time point while the second liquid level detection part 682 maintains the state where the liquid level is present. When the amount obtained by subtracting the amount of pulp liquid taken out from the predetermined time point reaches the predetermined amount, it is determined that the liquid level of the pulp liquid stored in the stirring tank 29 has fallen below the predetermined value. The predetermined time point is the same as above.

The error response function unit 825 starts from a predetermined time point obtained from the residual amount of pulp liquid at a predetermined time point and the measured value of the first flow meter 121 while the second liquid level detection unit 682 maintains the state where the liquid level is present. When the value obtained by subtracting the withdrawal amount obtained from the drive amount of the first pump 11 from a predetermined time point from the total value with the supply amount of the above reaches a predetermined value, the pulp liquid stored in the stirring tank 29 falls below the predetermined amount. Judge.

In the storage unit, for example, the supply amount predicted based on the measured value of the first flow meter 121 and the drive amount of the third pump 13 from the start of the second dilution process, and the start of the second dilution process. The estimated withdrawal amount based on the drive amount of the first pump 11 from the time point is stored. The error handling function unit 825 obtains the liquid level of the stirring tank 29 from the predicted supply amount and withdrawal amount and the residual amount of the pulp liquid in the stirring tank 29 at the start of the second dilution treatment. As the supply amount, a predicted value from either the measured value of the first flow meter 121 or the drive amount of the third pump 13 may be used, and a value obtained by performing some calculation such as averaging both of them may be used. You may use it. When the second liquid level detection unit 682 does not detect the liquid level even though the predicted value of the obtained liquid level has reached a predetermined value set in advance, it is determined that an error has occurred.

More specifically, the error handling function unit 825 performs both supply of the diluent and removal of the pulp solution for a predetermined time from the start of the second dilution treatment. When the supply of the predetermined amount of the diluent is completed, the third pump 13 is stopped. The driving of the first pump 11 is continued, and only the pulp liquid withdrawal process is performed. Then, when the driving amount of the first pump 11 from the start time of the second dilution treatment or the completion of the second dilution treatment reaches a predetermined value, the error response function unit 825 changes the liquid level of the stirring tank 29 to the second liquid. It is determined that the position has fallen below the installation position of the position detection unit 682. At this time, if the second liquid level detection unit 682 does not change from the presence or absence of the liquid level, the control unit determines that an error has occurred in the second liquid level detection unit 682.

The error response function unit 825 responds when an error occurs in the second liquid level detection unit 682, such as the residual amount of the stirring tank 29, the measured value of the first flow meter 121, the drive amount of the third pump 13, and the first pump. The drive amount of 11 is shifted to the next process. Then, the third pump 13 is driven to execute the third dilution process. As a result, the third dilution treatment can be started even if the second liquid level detection unit 682 cannot properly detect the liquid level.

Similarly, the liquid level of the stirring tank 29 is predicted based on the residual amount of the pulp liquid in the stirring tank 29, the supply amount of the diluted liquid to the stirring tank 29, and the withdrawal amount of the pulp liquid from the stirring tank 29. Then, the second liquid level detection unit 682 determines whether or not an error has occurred. Even if the second liquid level detection unit 682 causes an error when both the pulp liquid dilution process and the pulp solution extraction process are performed in parallel or individually, the error response function unit 825 executes the process properly. it can.

In response to the determination that an error has occurred in the second liquid level detection unit 682, a case where the dilution treatment is subsequently performed a plurality of times based on the predicted liquid level has been described. However, instead of this, the error handling function unit 825 may control to abandon the dilution process when an error occurs. In that case, the error handling function unit 825 continues to take out the pulp liquid without supplying the diluent after the second liquid level detection unit 682 determines that an error has occurred.

After that, when the liquid level of the pulp liquid in the stirring tank 29 is detected by the third liquid level detection unit 683, the extraction of the pulp liquid is completed. When the second and subsequent dilution treatments are abandoned in this way, all the pulp liquids sent to the dilution unit 4 have the first concentration. Therefore, a required amount of diluent corresponding to this concentration is added in the dilution section 4.

Even if the third liquid level detection unit 683 cannot properly detect the liquid level of the pulp liquid and an error occurs, the error response function unit 825 takes measures when an error occurs. The error response function unit 825 processes the pulp liquid based on at least one of the detection result of the third liquid level detection unit 683 and the amount of the pulp liquid taken out from the pulp liquid take-out unit 34. This withdrawal amount is an amount from a predetermined time point. The predetermined time point is the same as above, and for example, the amount taken out from the time when all the dilution treatment is completed or the time when the liquid level of the second liquid level detection unit 682 is detected can be set.

The error response function unit 825 is a stirring tank when the amount of pulp liquid taken out from the stirring tank 39 from a predetermined time point reaches a predetermined amount while the third liquid level detecting unit 683 maintains the state of having a liquid level. It is determined that the liquid level of the pulp liquid stored in 29 has fallen below a predetermined value. The take-out amount includes a value obtained from the drive amount of the first pump 11 that takes out the pulp liquid from the stirring tank 29.

Further, the error handling function unit 825 determines the residual amount of pulp liquid remaining in the stirring tank 29 at a predetermined time point and the amount of pulp liquid taken out from the predetermined time point, as in the case of the error occurrence of the second liquid level detection unit 682 described above. It is also possible to determine the occurrence of an error based on at least one of them.

When determining the completion of taking out the pulp liquid from the stirring tank 29, the error handling function unit 825 monitors the amount of the pulp liquid in the stirring tank 29 at a predetermined time point and the driving amount of the first pump 11 from the predetermined time point. To do. From this, the error handling function unit 825 grasps the amount of pulp liquid taken out from the stirring tank 29. From the obtained withdrawal amount, the amount of pulp liquid remaining in the stirring tank 29 is predicted. The error response function unit 825 detects the third liquid level detection unit 683 when the drive amount of the first pump 11 reaches a preset predetermined value while the third liquid level detection unit 683 does not detect the liquid level. Judge that an error has occurred. Then, the error response function unit 825 takes a response when an error occurs and stops the drive of the first pump 11. From this, the extraction of the pulp liquid is completed. Further, if necessary, water supply or cleaning treatment inside the stirring tank 29 is carried out in preparation for the next disintegration treatment.

When the deinking liquid detection unit 58 installed in the deinking unit 5 cannot properly detect the liquid level due to some trouble, the control unit 8 deinks the pulp liquid that first flows into the deinking unit 5. When it is completed, the transfer process to the papermaking section 6 cannot be started properly. In addition, the deinked pulp liquid to be transferred to the papermaking section 6 flows into the agglomerating section 55 and is discarded. Therefore, the error handling function unit 825 grasps the occurrence of an error in the deinking liquid detection unit 58 and responds to this. The error handling function unit 825 is transferred from the pulp manufacturing unit 3 and stored in the deinking processing unit 54, and the deinking processing unit 54 from the second supply unit 44 via the pipe 101 and the inflow unit 56. The pulp liquid is transferred to the next step based on the supply amount of at least one of the pulp liquid and water to be supplied to the next step.

In the error response function unit 825, the amount of the diluted pulp liquid transferred from the diluting unit 4 to the deinking processing unit 54 reaches a predetermined amount while the deinking liquid detecting unit 59 maintains the state of no liquid level. At that time, it is determined that the liquid level of the pulp liquid stored in the deinking processing unit 54 exceeds a predetermined value. The supply amount is the measured value of the driving amount of the fourth pump 14 that supplies the diluent to the deinking processing unit 54 and the flow rate of the diluting liquid supplied to the deinking processing unit 54. Includes values obtained from at least one.

First, the error handling function unit 825 grasps the amount of pulp liquid flowing into the deinking processing unit 54 from the driving amount of the first pump 11. The driving amount of the first pump 11 is used to grasp the amount of the pulp liquid taken out from the pulp manufacturing unit 3 and sent to the deinking unit 5. Next, the control unit grasps the amount of the diluting liquid sequentially added to the pulp liquid in the diluting unit 4 from at least one of the measured value of the second flow meter 122 and the driving amount of the fourth pump 14.

Then, the total value of the amount of the pulp liquid from the pulp manufacturing unit 3 and the amount of the diluted liquid added in the diluting unit 4 is considered to correspond to the amount of the pulp liquid stored in the deinking processing unit 54. The amount of the pulp liquid and the diluted liquid flowing into the deinking treatment unit 54 is grasped as a numerical value per unit time. The integrated value of the flow rate per unit time from the start of inflow to the deinking processing unit 54 is the storage amount of the deinking processing unit 54.

If necessary, the amount of pulp liquid that is scraped by the blade 73 as foam and collected in the agglomerating portion 55 during the deinking treatment may be subtracted from the amount of pulp liquid stored in the deinking treatment portion 54. The amount of pulp liquid collected in the agglomerating section 55 is set based on experimental data and the like and stored in advance in the storage section.

When it is determined that an error has occurred in the deinking liquid detection unit 59, the error response function unit 825 drives the second pump 12. From this, even if the deinking liquid detection unit 59 causes a detection error, it is possible to grasp the completion of the deinking process. Then, the pulp liquid after deinking can be appropriately transferred to the papermaking section 5 in the subsequent stage.

When the coagulant liquid detection unit 553 cannot detect the liquid level, the corresponding process cannot be started even though the coagulated liquid has reached a predetermined liquid level. In this case, the error handling function unit 825 is at least one of the coagulated liquid and the foam based on at least one of the drive amount of the first pump 11 and the measured value of the second flow meter 122 or the drive amount of the fourth pump 14. Predict the amount. In the storage unit, the liquid of the agglomerating unit 55 corresponding to both the driving amount of the first pump 11 obtained by an experiment or the like and at least one of the measured value of the second flow meter 122 or the driving amount of the fourth pump 14. The predicted value of the place is stored.

The error response function unit 825 aggregates when the predicted value of the supply amount of foam as the fiber-containing liquid to the agglomerate unit 55 reaches a predetermined amount while the agglomerate liquid detection unit 553 maintains the state of no liquid level. It is determined that the liquid level of the foam or agglomerated liquid stored in the portion 55 exceeds a predetermined value. Then, the error handling function unit 825 determines that the coagulation liquid detection unit 553 has generated a coagulation liquid detection error.

In response to the occurrence of an error in the coagulant detection unit 553, the error response function unit 825 executes a coagulant addition process, if necessary. Further, the error handling function unit 825 rotates the stirring blade 552 for a predetermined time, if necessary, to perform the stirring process. When the coagulation liquid detection unit 553 is set to take out the coagulation liquid when the liquid level is detected, the error handling function unit 825 takes out the coagulation liquid from the coagulation liquid extraction unit 554 and sends it to the waste liquid treatment unit 9.

In the waste liquid tank 92, when the waste liquid detection unit 95 does not operate normally for some reason and the liquid level cannot be detected, the error response function unit 825 determines the occurrence of an error based on the supply amount of the coagulated liquid, and determines the occurrence of the error. Take action. The coagulated liquid is supplied from the coagulating portion 55 to the waste liquid tank 92 by driving the fifth pump 15. The agglomerating unit 55 constitutes a supply unit for supplying the agglomerating liquid to the waste liquid tank 92. The error response function unit 825 stores the waste liquid stored in the waste liquid tank 92 when the supply amount of the coagulated liquid to the waste liquid treatment unit 9 reaches a predetermined amount while the waste liquid detection unit 95 maintains the state of no liquid level. It is judged that the liquid level of is above the predetermined value. The supply amount of the coagulating liquid includes a value obtained from the driving amount of the fifth pump 15 that supplies the coagulating liquid to the waste liquid tank 92.

The coagulated liquid is filtered in the filtration unit 91. The amount of waste liquid supplied to the waste liquid tank 92 is a value obtained by subtracting a certain amount sequentially separated by the filtration unit 91 from the amount of coagulated liquid transferred to the waste liquid treatment unit 9 by driving the fifth pump 15. .. The amount separated from the aggregated liquid in the filtration unit 91 is set based on experimental data and the like and stored in the storage unit.

The error response function unit 825 predicts that the liquid level of the waste liquid tank 92 will reach the installation position of the second waste liquid detection unit 952 when the drive amount of the fifth pump 15 reaches a preset predetermined value. At this time, if the second waste liquid detection unit 952 remains without a liquid level, the error handling function unit 825 determines that an error has occurred. The error response function unit 825 drives the seventh pump 17 for a predetermined time. A predetermined amount of waste liquid is discharged to the outside of the apparatus by driving the seventh pump 17. By driving the 7th pump 17 with a predetermined low folk tool based on the driving amount of the 5th pump 15, it is possible to prevent the waste liquid from overflowing from the waste liquid tank 92.

In the white water tank 66, when the white water detection unit 69 does not operate normally for some reason and the liquid level of the liquid stored in the white water tank 66 cannot be detected, the error response function unit 825 takes measures when an error occurs. The error handling function unit 825 processes the liquid stored in the white water tank 66 based on the supply amount of the liquid supplied to the white water tank 66. The supply amount includes the amount of purified water supplied from the supply unit 65 to the white water tank 66 and the amount of white water supplied from the water receiving unit 624 to the white water tank 66. The treatment of the liquid in the white water tank 66 includes a treatment of transferring the liquid to each part such as the pulp manufacturing part 3, the diluting part 4, and the deinking part 5, and an operation of supplying either white water or purified water liquid to the white water tank 66. Includes processing to stop.

The error response function unit 825 stores the liquid stored in the white water tank 66 when the amount of purified water or white water supplied to the white water tank 66 reaches a predetermined amount while the white water detection unit 69 maintains the state of no liquid level. It is judged that the liquid level of is above the predetermined value. This supply amount includes a value obtained from the measured value of the third flow meter 123. Further, the supply amount includes a value obtained from the drive amount of the second pump 12.

The second pump 12 transfers the pulp liquid from the deinking section 5 to the papermaking section 6. The error handling function unit 825 predicts the amount of pulp liquid transferred from the deinking unit 5 to the papermaking unit 6 based on the driving amount of the second pump 12. Then, the error handling function unit 825 predicts the amount of white water that flows down from the papermaking net 621 and is collected in the white water tank 66 when the wet paper W is formed from the pulp liquid transferred to the papermaking unit 6. .. The amount of white water collected in the white water tank 66 can be obtained from experiments and the like. The storage unit stores the amount of white water collected in the white water tank 66 corresponding to the driving amount of the second pump 12.

For example, when the second white water detection unit 692 has no liquid level and the drive amount of the second pump 12 or the measured value of the third flow meter 123 reaches a predetermined value set in advance, the error response function unit 825 is set to the third. 2 It is determined that an error has occurred in the white water detection unit. Then, the error handling function unit 825 executes necessary processing such as stopping the supply of purified water from the supply unit 65 or taking out the liquid by driving the third pump 13.

The error response function unit 825 is based on the amount of white water that is predicted to be newly collected in the white water tank 66 and the amount of purified water or white water that has already been stored in the white water tank 66 and remains. It is also possible to grasp the liquid level of 66. When the liquid level obtained by summing the predicted values of both the supply amount and the residual amount exceeds a preset predetermined value, it is determined that the white water detection unit 69 could not detect the liquid level of the white water tank 66. Then, the error response function unit 825 takes a response when an error occurs.

As a response when an error occurs, the control unit stops the inflow of white water into the white water tank 66. Therefore, the error handling function unit 825 temporarily stops driving the second pump 12. At this time, if necessary, it is preferable to stop the first pump 12 at the same time as stopping the second pump 12. When the second pump 12 is stopped, the transfer of the pulp liquid to the papermaking section 6 is interrupted. Then, the formation of the wet paper W is interrupted, and the inflow of white water into the white water tank 66 is interrupted.

The error handling function unit 825 may be controlled to transfer the liquid in the white water tank 66 to the waste liquid treatment unit 9 instead of temporarily stopping the second pump 12. In order to transfer the liquid in the white water tank 66 to the waste liquid treatment unit 9, a pipe 109, a pump 18, a valve 134 and the like for transferring the liquid from the white water tank 66 to the waste liquid treatment unit 9 are required.

The error response function unit 825 opens the valve 134 and drives the pump 18. The liquid in the white water tank 66 flows through the pipe 109 and is transferred to the waste liquid treatment unit 9. The solid content of this liquid is separated by the filtration unit 91, and the liquid is stored in the waste liquid tank 92 as a waste liquid. In this way, the papermaking operation can be continued by transferring the liquid in the white water tank 66 to the waste liquid treatment unit 9 instead of stopping the second pump 12.

Further, the error handling function unit 825 processes either the purified water or the white water liquid based on at least one of the detection result of the white water detection unit 69 and the amount of purified water or white water taken out from the extraction unit 67. .. Examples of the liquid treatment include a liquid extraction treatment from the white water tank 66, a liquid transfer treatment to each part, and a liquid addition treatment from the liquid supply unit 65 and the water receiving unit 624.

When the amount of liquid taken out from the white water tank 66 from a predetermined time point reaches a predetermined amount while the white water detection unit 69 maintains the state of having a liquid level, the error response function unit 825 moves the liquid in the white water tank 66. It is judged that the place is below the predetermined value. At a predetermined time point, for example, when the liquid level of the white water tank 66 reached a predetermined value by detecting the liquid level by the first white water detection unit 691 or the second white water detection unit 692, the pulp manufacturing unit 3 started the dilution treatment. When the first pump 11 is started to drive and the pulp liquid is transferred from the pulp manufacturing section 3 to the deinking section 4 and the dilution process is started in the diluting section 4, the driving of the second pump 12 is started and the deinking section is started. For example, when the supply of the pulp liquid from No. 5 to the papermaking section 6 is started.

The withdrawal amount includes a value obtained from at least one of the driving amounts of the third pump 13 or the fourth pump 14 for taking out the liquid from the white water tank 66.

Further, the error handling function unit 825 treats purified water or white water based on the residual amount of the fiber-containing liquid remaining in the white water tank 66. The error response function unit 825 is obtained from the residual amount of either purified water or white water liquid at a predetermined time point and the measured value of the third flow meter 123 while the white water detection unit 69 maintains the state of having a liquid level. When the value obtained by subtracting the withdrawal amount from the predetermined time point obtained from the drive amount of the third and fourth pumps 13 and 14 from the total value with the supply amount from the predetermined time point reaches the predetermined value, it is stored in the white water tank 66. It is judged that the amount of liquid has fallen below the predetermined amount.

The error response function unit 825 is a white water extraction unit based on the total of the residual amount at a predetermined time point and the supply amount from the third supply unit 65 from the predetermined time point while the white water detection unit 69 maintains the state of no liquid level. When the amount obtained by subtracting the amount taken out from 67 reaches a predetermined amount, it is determined that the liquid level of the liquid stored in the white water tank 66 has exceeded the predetermined value. The error response function unit 825 is the sum of the residual amount at a predetermined time point and the supply amount from the predetermined time point obtained from the measured value of the third flow meter 123 while the white water detection unit 69 maintains the state of no liquid level. When the value obtained by subtracting the withdrawal amount obtained from the drive amount of the third and fourth pumps 13 and 14 from the value reaches a predetermined value, it is determined that the liquid level of the liquid stored in the white water tank 66 exceeds the predetermined value. ..

When either white water or purified water liquid is already stored in the white water tank 66, the measured value from the predetermined time point of the third flow meter 123 and the drive of the third and fourth pumps 13, 14 from the predetermined time point. The current liquid level of the white water tank 66 is predicted from the amount of water taken out from the white water tank 66 obtained based on the amount. As a result, not only the white water tank 66 can be prevented from overflowing, but also the white water tank 66 can be prevented from becoming empty.

(Error during cleaning)
The above-mentioned response when an error occurs relates to the reproduction operation of the used paper U. These can be similarly carried out when performing the cleaning treatment. That is, when cleaning the stirring tank 29, when the cleaning liquid is detected by the first liquid level detection unit 681, the cleaning function unit 822 stops the supply of the cleaning liquid. At this time, if the first liquid level detection unit 681 or the second liquid level detection unit 682 causes an error and the liquid level of the cleaning liquid cannot be detected, the value obtained from the measured value of the first flow meter 121 is used as a base. Grasp the liquid level of the stirring tank 29.

When the measured value of the first flow meter 121 exceeds a predetermined value, the error handling function unit 825 determines that a detection error has occurred in the first liquid level detection unit 681 or the second liquid level detection unit 682. Then, the error handling function unit 825 stops the third pump 13 and stops the supply of the cleaning liquid.

After that, the error handling function unit 825 rotates the stirring blade 41 in the forward and reverse directions to clean the inside of the stirring tank 29. The generated cleaning waste liquid is taken out from the pulp liquid take-out unit 34. When the cleaning waste liquid is taken out, the second liquid level detection unit 682 or the third liquid level detection unit 683 cannot properly detect the liquid level of the cleaning waste liquid, and when an error occurs, the error handling function unit 825 Take action when an error occurs. In the response when an error occurs in the second liquid level detection unit 682 or the third liquid level detection unit 683, the error response function unit 825 uses a value obtained from the drive amount of the first pump 11.

The error handling function unit 825 predicts the amount of cleaning waste liquid to be taken out from the stirring tank 29 from the driving amount of the first pump 11. The amount of cleaning waste liquid remaining in the stirring tank 29 is grasped by subtracting the predicted amount of cleaning waste liquid from the amount of cleaning waste liquid stored in the stirring tank 29 at the start of taking out the cleaning waste liquid. With the second liquid level detection unit 682 or the third liquid level detection unit 683 still in the liquid level, the amount of cleaning waste liquid obtained from the driving amount of the first pump 11 is, for example, the cleaning waste liquid at the start of removal. When the value obtained by adding a predetermined value such as 50 L to the amount of 50 L is exceeded, the error handling function unit 825 determines that a detection error of the second liquid level detection unit 682 or the third liquid level detection unit 683 has occurred.

When cleaning the deinking unit 5, when an error occurs in the deinking liquid detecting unit 59 and the level of the cleaning liquid cannot be detected, the cleaning function unit 822 cannot stop the supply of the cleaning liquid at an appropriate timing. .. Therefore, the error handling function unit 825 processes the cleaning liquid based on the supply amount of the cleaning liquid supplied from the pipe 101 as the supply unit to the deinking processing unit 54 as the storage unit.

The amount of the cleaning liquid supplied to the deinking processing unit 54 as the storage unit is a predetermined amount stored in advance while the deinking liquid detecting unit 59 as the liquid level detecting unit maintains the state of no liquid level. When it reaches, the error handling function unit 825 determines that the liquid level of the cleaning liquid stored in the deinking processing unit 54 as the storage unit exceeds a predetermined value.

The amount of cleaning liquid supplied is the measured value of the driving amount of the fourth pump 14 that supplies the cleaning liquid to the deinking processing unit 54 and the flow rate of the cleaning liquid supplied to the deinking processing unit 54. Includes values obtained from at least one.

During the cleaning process of the head box 61, the sixth pump 16 is driven and the cleaning waste liquid is transferred to the waste liquid tank 92. The cleaning waste liquid used for cleaning the inside of the head box 61 is guided to the pipe 102 when the second pump 12 is rotated in the reverse direction, and is transferred to the waste liquid tank 92 via the third valve 133 and the pipe 106. Ru. The error handling function unit 825 processes the waste liquid based on the supply amount of the cleaning waste liquid containing fibers supplied from the pipe 102 as the supply unit to the waste liquid tank 92.

The error response function unit 825 stores the waste liquid stored in the waste liquid tank 92 when the amount of the waste liquid supplied to the waste liquid tank 92 reaches a predetermined amount while the waste liquid detection unit 92 maintains the state of no liquid level. It is judged that the place exceeds the predetermined value. This supply amount includes a value obtained from the drive amount of the second pump 12 as a supply pump for supplying the cleaning waste liquid to the waste liquid tank 92. The error handling function unit 825 processes the fiber-containing liquid based on the residual amount of the fiber-containing liquid remaining in the waste liquid tank 92.

In the above embodiment, the case where the error of the liquid level detection unit occurs in either the recycling operation of the used paper U or the cleaning operation inside the apparatus has been described. In addition to this, it is also possible to handle the maintenance of the device in the same manner. At the time of maintenance, it may be checked whether there is a liquid leak in each mechanism, piping, valve, etc. At this time, the liquid for checking the liquid leakage is circulated inside the device. The control unit supplies a liquid for confirmation in a stirring tank, a deinking treatment unit, an agglomeration unit, a white water tank, a waste liquid tank, etc. until the liquid level detecting unit detects the liquid level. When an error occurs in the liquid level detection unit, the liquid level can be determined based on the amount of the confirmation liquid taken out from each part, the supply amount, the residual amount, and the like, as in the case of the cleaning operation.

Further, although the used paper processing device 1 includes the deinking unit 5, the deinking unit 5 may be omitted. Further, although the papermaking unit 6 is provided with the water absorption belt 631, the wet paper may be transferred from the papermaking net to the drying belt or the drying drum to be dried without the water absorption belt 631.

1 Waste paper processing equipment, 8 Control unit.

Claims (13)

A storage unit that stores the fiber-containing liquid obtained by stirring used paper with water,
An extraction unit provided in the storage unit and taking out the fiber-containing liquid from the storage unit,
A liquid level detection unit that detects the liquid level of the fiber-containing liquid stored in the storage unit, and
A control unit for controlling the fiber-containing liquid to be subjected to a predetermined treatment is provided.
The control unit is a waste paper processing device that processes the fiber-containing liquid based on at least one of the detection result of the liquid level detection unit and the amount of the fiber-containing liquid taken out from the take-out unit. The control unit contains fibers to be stored in the storage unit when the amount of fiber-containing liquid taken out from the storage unit reaches a predetermined amount while the liquid level detection unit maintains the state of having a liquid level. The used paper processing apparatus according to claim 1, wherein it is determined that the liquid level of the liquid has fallen below a predetermined value. The withdrawal amount is a flow meter that measures the driving amount of the take-out pump for taking out the fiber-containing liquid from the storage unit and the flow rate of at least one of the fiber-containing liquid or the water supplied to the storage unit. The used paper processing apparatus according to claim 1 or 2, wherein a value obtained from at least one of the measured values of the above is included. A supply unit for supplying the liquid to the storage unit is provided.
The waste paper processing apparatus according to any one of claims 1 to 3, wherein the control unit processes the liquid based on the supply amount of the liquid supplied from the supply unit to the storage unit. The control unit contains the fibers stored in the storage unit when the supply amount of the liquid to the storage unit reaches a predetermined amount while the liquid level detection unit maintains the state of no liquid level. The used paper processing apparatus according to claim 4, wherein it is determined that the liquid level of the liquid exceeds the installation position of the liquid level detection unit. The supply amount is a value obtained from at least one of the driving amount of the supply pump that supplies the liquid to the storage unit and the measured value of the flow meter that measures the flow rate of the liquid supplied to the storage unit. The used paper processing apparatus according to claim 4 or 5, which is included. The used paper processing apparatus according to any one of claims 1 to 6, wherein the control unit processes the fiber-containing liquid based on the residual amount of the fiber-containing liquid remaining in the storage unit. The control unit is from a supply unit that supplies at least one of the fiber-containing liquid and the water to the residual amount and the storage unit while the liquid level detection unit maintains the liquid level. 7. Claim 7 for determining that the liquid level of the fiber-containing liquid stored in the storage unit has fallen below the installation position of the liquid level detection unit when the amount obtained by subtracting the withdrawal amount from the total supply amount reaches a predetermined amount. Waste paper processing equipment described in. The control unit measures the driving amount of the supply pump that supplies the liquid to the storage unit and the flow rate of the liquid supplied to the storage unit while the liquid level detection unit maintains the liquid level. From the total value of the residual amount and the value obtained from at least one of the measured values of the flow meter
When the value obtained by subtracting the value obtained from at least one of the measured values of the flow meter that measures the driving amount of the take-out pump and the flow rate of the liquid taken out from the storage unit reaches a predetermined value.
The used paper processing apparatus according to claim 8, wherein it is determined that the pulp liquid stored in the storage unit has fallen below the installation position of the liquid level detection unit. The control unit is the storage unit when the amount obtained by subtracting the withdrawal amount from the total of the residual amount and the supply amount reaches a predetermined amount while the liquid level detection unit maintains the state of no liquid level. The used paper processing apparatus according to claim 7, wherein it is determined that the liquid level of the fiber-containing liquid stored in the fiber-containing liquid exceeds the installation position of the liquid level detection unit. The control unit measures the driving amount of the supply pump that supplies the liquid to the storage unit and the flow rate of the liquid supplied to the storage unit while the liquid level detection unit maintains the state of no liquid level. From the total value of the value obtained from at least one of the measured values of the flow meter and the residual amount,
When the value obtained by subtracting the value obtained from at least one of the measured values of the flow meter that measures the driving amount of the take-out pump and the flow rate of the liquid taken out from the storage unit reaches a predetermined value.
The used paper processing apparatus according to claim 10, wherein it is determined that the liquid level of the fiber-containing liquid stored in the storage unit exceeds the installation position of the liquid level detection unit. The used paper processing apparatus according to any one of claims 1 to 11, wherein the liquid level detection unit includes a capacitance type sensor. The used paper processing apparatus according to claim 12, wherein the liquid level detection unit includes a float type sensor.

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