JP2002159882A - Centrifugal separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centrifugal separator capable of corresponding to a plurality of products. SOLUTION: The centrifugal separator has a parameter setting unit for storing a parameter, wherein at least one of the time of a manufacturing process and the rotational speed of a rotary drum is set on the basis of a kind manufactured from a slurry, an operation data and a control part for controlling a charge process for supplying the slurry into the rotary drum from a supply part on the basis of the operation data during the rotation of the rotary drum, an acceleration process for accelerating the rotational speed of the rotary drum to a predetermined rotational speed of a s hake-off process for keeping the rotational speed of the rotary drum to separate the slurry in the rotary drum into a liquid component and solid component, a deceleration process for decelerating the rotational speed of the rotary drum and a scrape-off process for scraping off the solid component by a scraper when the rotational speed of the rotary drum becomes a predetermined rotational speed or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifuge, and more particularly to a centrifuge capable of handling a plurality of types.

[0002]

2. Description of the Related Art Conventionally, a batch type centrifuge for separating a solid component from a slurry has been used in the food industry or the like. As an example, a centrifuge used in the sugar refining process will be described with reference to FIG. When the valve is fully opened, the constant feed type supply device 102 throws the slurry containing the sugar crystals into the rotating drum, and after the specified amount of slurry is thrown, the valve is fully closed. The fixed-type charge amount detection device 101 detects that a specified amount of slurry has been charged when the slurry reaches a preset thickness on the rotating drum of the centrifuge. The driving device 107 drives a motor 108 connected to the rotating drum based on a command value output from the control device 106.

The fixed-speed scraping device 103 scrapes a solid component separated from a liquid component and adhering to the inside of the rotating drum at a constant speed in the axial direction of the rotating drum. take. Manual variable speed setting device 104
In, the rotation speed of the rotating drum is set manually.
In the one-product type timer setting device 105, the operation time of each process is set in advance. The control device 106 outputs a command value for controlling the rotation speed of the rotating drum based on the set value set by the manually variable speed setting device 104 and the one-product type timer setting value 105.
07 and controls the operation of each unit of the apparatus.

[0004]

However, the above-described centrifugal separator has the following problems. 1) Since the slurry is thrown into the rotating drum by fully opening or closing the valve, when the slurry having a soft viscosity is thrown, the slurry is thrown into the rotating drum at an unnecessarily high speed. As a result, the slurry was biased in the rotating drum, and the balance of the rotating drum was lost.

[0005] 2) The fixed charge amount detecting device 101
Since the position for detecting the thickness of the slurry is mechanically fixed, the position to be detected by the operator must be adjusted every time the amount of the slurry to be introduced is changed due to the change in the type of the slurry. 3) In order to move at a constant speed in the axial direction of the rotating drum of the fixed speed scraping device 103 to scrape solid components,
For some varieties, there is a problem that sugar crystals are destroyed at the time of scraping and the quality is reduced. 4) Since the rotation speed of the rotating drum and the operation time of each process had to be set manually, the operator had to change the setting every time the kind or the input amount of the slurry was changed. 5) In particular, in the case of 2) and 4) above, in order to cope with various types, it is necessary to change various setting values through a control device, change settings on site, and the like. In addition, complicated operations for performing various operations occur, and it takes a long time to change the settings.In addition, there is a possibility that the operator may make a mistake in the change operation, resulting in variations in product quality. There was a problem that would.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a centrifugal separator that can handle a plurality of types.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a rotary drum having a peripheral wall formed as a filter wall, and a slurry supplied to the rotary drum. Supply unit, a drive unit for rotating the rotary drum, and a scraper for rotating the rotary drum and scraping solid components separated from liquid components and adhered to the rotary drum from the rotary drum. In the control system of the centrifuge, at least one of the time of the manufacturing process or the rotation speed of the rotary drum is a parameter setting unit that stores a parameter set based on a product type manufactured from the slurry as operation data, Based on the operation data stored in the parameter setting unit, the slurry is supplied from the supply unit during rotation of the rotary drum. A charging step of supplying the inside of the rotating drum, an accelerating step of accelerating the rotating speed of the rotating drum to a predetermined rotating speed, and maintaining the rotating speed of the rotating drum to convert the slurry in the rotating drum into a liquid component and a solid component. And a deceleration step of reducing the rotation speed of the rotating drum after the shaking-off step; and when the rotation speed of the rotating drum falls below a predetermined rotation speed, the solid component is removed by the scraping device. And a control unit for controlling a scraping step of scraping off.

In the centrifugal separator according to the present invention, the parameter setting unit may include at least one or more intermediate swing-off steps for setting the rotation speed to a constant speed during the acceleration of the rotation speed of the rotary drum in the acceleration step. The operation data including the operation data is set according to the type, and the control unit performs control based on the operation data of the parameter setting unit so as to perform the intermediate swing-off process during the acceleration of the rotation speed of the rotary drum in the acceleration process. It is characterized by doing.

In the centrifugal separator according to the present invention, the parameter setting unit may control the scraping device to move in the axial direction of the rotating drum at a moving speed corresponding to the rotating speed of the rotating drum in the scraping step. The operation data to be moved to is set according to the type, the control unit is based on the operation data set in the parameter setting unit, the scraping device in the scraping step at a moving speed according to the type. It is characterized by performing control for moving.

[0010] In the centrifuge according to the present invention, the parameter setting unit may set operation data of a predetermined value for setting a current supplied to the drive unit to a predetermined value in accordance with a product type. The control unit is based on the operation data set in the parameter setting unit,
In the acceleration step, control is performed such that a current of a predetermined value flows through the driving unit.

Further, according to the present invention, in the above-described centrifuge, the parameter setting unit sets in advance the time for performing the acceleration step as operation data in accordance with the type of product, and the control unit controls the parameter setting. On the basis of the operation data set in the unit, control is performed so as to perform an acceleration process according to a preset time.

Further, according to the present invention, in the above-mentioned centrifuge, the parameter setting unit sets in advance the time for performing the deceleration step as operation data in accordance with the type of product, and the control unit controls the parameter setting. On the basis of the operation data set in the unit, control is performed such that a deceleration process corresponding to a preset time is performed.

Further, according to the present invention, in the above-described centrifuge, the control means may control the rotation speed of the rotary drum based on the operation data set in the parameter setting unit even during the deceleration step. When the rotation speed is lower than a predetermined rotation speed, control is performed so as to perform the scraping step.

Further, according to the present invention, in the above-mentioned centrifuge, the parameter setting unit may be configured so that operation data for determining a supply speed of the slurry supplied from the supply section is set according to a product type. The means controls the supply unit based on the operation data set in the parameter setting unit so that the supply speed becomes a supply speed corresponding to the operation data in the charging step.

Further, according to the present invention, in the above-described centrifugal separator, the centrifugal separator further includes a detecting unit for detecting an amount of slurry attached to an inner wall of the rotary drum, and the parameter setting unit includes: The detection unit corresponding to the type is set with the data of the detection position height in the axial direction of the rotary drum as operation data, and the control unit detects the detection position according to the operation data set in the parameter setting unit. The detection unit is controlled to move to the height. Further, according to the present invention, in the parameter setting unit, operation data for determining a predetermined charge amount to be supplied to the inside of the rotary drum is stored according to a product type, and the centrifugal separator is further provided inside the rotary drum. A controller configured to detect a quantity of the slurry attached to the wall, wherein the controller has conversion data for converting a predetermined charge amount stored in the parameter setting unit into a thickness t of the slurry in the rotating drum; With
Based on the conversion data, control is performed to rotate the detection unit in the horizontal direction of the rotating drum to a position of a thickness t of the slurry corresponding to a predetermined charge amount, and the detection unit responds to an instruction from the control unit. After rotating the rotary drum to the position of the slurry thickness t in the horizontal direction, when the slurry reaches the thickness t, a detection signal indicating that a predetermined charge amount has been reached is output. And

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a centrifuge according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a configuration of a centrifuge to which a control system for a centrifuge according to an embodiment of the present invention is applied. Here, a batch-type suspended centrifuge will be described as an example of the centrifuge. In this figure, a charge amount detection device 1 detects a charge amount based on a control signal output from a control device 5. Here, the charge amount refers to the supply amount of the slurry to be put into the rotary drum in one batch. The charge amount detection device 1 includes a detection arm 1a and a sensor 1b, and outputs a detection signal to the control device 5 according to the thickness of the sugar crystal attached to the inside of the rotating drum. The charge amount detection device 1 is mounted such that the detection arm 1a is at a predetermined height inside the rotating drum 9.

The charge amount detecting device 1 will be described in more detail with reference to FIG. In FIG. 2, before the slurry is supplied into the rotating drum 9, the charge amount detecting device 1 rotates the detecting arm 1 a to a position indicated by the reference numeral 1 c and abuts the inner wall of the rotating drum 9. After the slurry is supplied, the detection arm 1a is pushed back in the direction of the arrow 1f according to the thickness of the slurry 1e attached to the inner wall of the rotating drum 9. The sensor connected to the detection arm 1a by the connection member outputs a detection result corresponding to the pushed back amount to the control device 5 as a detection signal. Thus, the amount attached to the inner wall of the rotating drum 9 is detected, and the detection result is output to the control device 5. In addition, before the slurry is supplied into the rotating drum 9, the charge amount detecting device 1 is controlled based on a control signal from the control device 5 to a position of the slurry thickness t corresponding to the charge amount to be detected. The detection arm 1a is moved (rotated) in the horizontal direction of the rotating drum. Then, the supplied slurry has a thickness t.
May be output from the sensor 1b to the control device 5 as a detection signal.

Returning to FIG. 1, variable feed type feeder 2
Is composed of a positioner 2a and a valve 2b.
Positioner 2a based on the control signal output from
The valve 2b is opened and closed by the operation, and the slurry is released from the upper end release portion 10
From the rotary drum 9. This positioner 2a
Operates the valve 2b in such a manner that the valve 2b is opened according to the control signal in addition to the opening and closing operation. As described above, the feed amount variable-type supply device 2 controls the feed amount, which is the slurry supply speed, by controlling the opening degree of the valve 2b so that the opening degree corresponds to the control signal from the control device 5. .

In the case of supplying the feed amount to the variable feed device 2, even if the opening degree of the valve 2b is constant, the feed amount accumulates the difference in viscosity between the types of slurry (raw material) and the slurry to be supplied. Since the value changes depending on the level (accumulated amount of slurry) in the feed tank, the valve is opened at an opening corresponding to the viscosity of the slurry of each type to be supplied and the level in the feed tank. When a large amount of slurry is supplied into the rotating drum 9 at once, the rotating drum 9
The slurry does not evenly adhere to the inner wall of the rotating drum 9 and the rotation of the rotating drum 9 becomes unbalanced. Therefore, when the opening degree of the valve 2b is controlled in accordance with the control signal from the control device 5 to feed a slurry having a soft viscosity,
When a hard slurry having a small valve opening and a high viscosity is supplied, the slurry is supplied with a large valve opening to prevent the rotation of the rotary drum 9 from becoming unbalanced.

Further, the feed amount variable supply device 2 controls the opening of the valve 2b according to the level in the feed tank. Here, FIG. 3 shows an example of the relationship between the level in the feed tank and the opening degree of the valve 2b when a certain kind of slurry is supplied into the rotary drum 9. As shown in FIG. 3, when the level in the feed tank is high (the amount of accumulated slurry is large), the opening degree of the valve 2b is set small, and the level in the feed tank is low (the amount of accumulated slurry is small). )
, The opening of the valve 2b is increased. Thereby, even when the level of the feed tank changes, the slurry can be supplied with an appropriate charge amount, and even when the viscosity of the slurry or the level in the tank changes, the time required for slurry supply is kept constant. It is possible to prevent the rotating drum 9 from being unbalanced.

Returning to FIG. 1, the scraping amount variable type scraping device 3
As the rotating drum 9 rotates, solid components separated from the liquid component of the slurry and adhered to the inside of the rotating drum 9 are scraped off from the rotating drum 9 while the rotating drum 9 is rotating. The variable scraping amount scraping device 3 will be described in more detail with reference to FIG. In FIG. 4, the variable scraping amount scraping device 3 includes a driving unit 3a and a scraper 3b. The drive unit 3a moves the scraper 3b downward (in the direction of the arrow indicated by reference numeral 3c) in the axial direction of the rotating drum 9 at a moving speed according to a control signal output from the control device 5.
The scraper 3b substantially contacts the inner wall of the rotating drum 9,
The solid components adhered to the inside of the rotating drum 9 are scraped off. The drive unit 3b moves the scraper 3b to the lower surface of the rotating drum 9 (reference numeral 3).
After moving to d), it is moved upward (the direction opposite to the direction of the multi-mark indicated by reference numeral 3c).

The drive section 3a is constituted by, for example, an air cylinder, and opens and closes at least one of the valves 3e and 3f based on a control signal output from the control device 5 to control the pressure in the air cylinder. Then, the piston 3g may be moved to move the scraper 3b. Thereby, the accuracy of the movement of the scraper 3b can be improved.

The maximum moving speed (maximum descending speed) v1 (mm / mm) for moving the scraper 3b in the axial direction.
Second) is W ÷ when the width of the scraper 3b is W (mm) and the rotation speed of the rotary drum 9 is N1 (rpm).
From (60 ÷ N1), it is expressed by the following equation (1). v1 = (W × N1) ÷ 60 (1) When the scraper 3b is lowered at a speed higher than v1, the solid components of the rotating drum 9 are left unscraped. For example, when the varieties of the solid components are upper sucrose, the rotation speed of the rotary drum 9 is set to about 50 (rpm) without breaking this sugar crystal and considering the processing situation of the next step, and the scraper 3b The moving speed depends on the capacity of the separator, but is desirably set to about 30 (mm / sec).

Returning to FIG. 1, the parameter setting unit 4
In the table, at least one of the manufacturing process time and the rotation speed of the rotary drum is stored in advance as operation data corresponding to each product type. FIG. 5 shows an example of this operation data.

As shown in FIG. 5, the charging time, the acceleration time, the deceleration time, the intermediate swing-out time, the swing-out time, and the like are set in advance as operation data according to the type of product as operation data. For example, the charge speed set value is operation data that determines the supply speed of the slurry supplied from the variable feed amount supply device 2. Further, operation data of a predetermined value for setting the current supplied to the drive unit 8 to a predetermined value is set as the set current value. Operation data for moving the variable scraping amount scraping device 3 in the axial direction of the rotating drum at a moving speed corresponding to the rotating speed of the rotating drum 9 is set as the scraper moving speed. Data relating to the intermediate shaking-off process for setting the rotation speed to a constant speed during the acceleration of the rotation speed of the rotary drum in the acceleration process is set as the number of intermediate shaking-offs, the intermediate shaking-off time, and the intermediate shaking-off speed. In addition to the above, operation data for controlling each unit of the apparatus is set according to the type.

As shown in FIG. 6, the control device 5 sends the slurry from the variable feed type feeding device 2 to the inside of the rotating drum 9 while the rotating drum 9 is rotating, based on the operation data stored in the parameter setting unit. A charging step (reference numeral 51) for supplying the rotating drum 9; an accelerating step (reference numeral 52) for accelerating the rotating speed of the rotating drum 9 to a predetermined rotating speed; and maintaining the rotating speed of the rotating drum 9 to remove the slurry in the rotating drum 9. Shaking-off process to separate liquid component and solid component (reference numeral 5)
3) is controlled. Further, the control device 5
A deceleration step (reference numeral 54) for reducing the rotation speed of the rotary drum 9 after the shaking-off step, and a solid component by the scraping amount variable type scraping device 3 when the rotation speed of the rotary drum 9 falls below a predetermined rotation speed. (Step 55)
And do control.

Further, based on the operation data set by the parameter setting unit 4, the control device 5 performs an intermediate swing-out step (reference numeral 56) for setting the rotation speed to a constant speed during the acceleration of the rotation speed of the rotary drum 9 in the acceleration step. ). This intermediate shaking-off process is performed at least one or more times depending on the type. However, depending on the type, the intermediate swing-out step may not be performed.

The control device 5 stores in advance for each type of conversion table for converting the detection result of the detection signal output from the sensor 1b into a charge amount, and outputs the output from the sensor 1b using this conversion table. The detected result is converted into a charge amount, and the converted charge amount is compared with the charge amount set by the parameter setting unit 4. Further, when the charge amount converted from the detection result reaches the predetermined charge amount set by the parameter setting unit 4, the control device 5 outputs a control signal to the feed amount variable type supply device 2 and Stop supply. The control device 5 stores conversion data for converting a predetermined charge amount stored in the parameter setting unit 4 into a predetermined slurry thickness t in the rotating drum. Then, based on the conversion data, the control device 5 controls the rotation of the rotary drum in the horizontal direction to the position of the thickness t of the slurry, and reaches a predetermined charge amount from the charge amount detection device 1. The supply of the slurry may be stopped when a detection signal indicating that the operation has been performed is output.

The control device 5 detects the rotation speed of the rotary drum 9 based on an output signal output from a speed detector provided in the electric motor 8.

The type changeover switch 7 is a switch for selecting an operation data pattern set in the parameter setting unit 4 and setting the same in the control device 5.

The variable speed driving device 6 drives the electric motor 8 based on a control signal output from the control device 5. The electric motor 8 rotates the rotating drum 9 at a rotation speed according to the output from the variable speed driving device 6. The rotating drum 9 is connected to an output shaft of the electric motor 8, and has a peripheral wall formed as a filter wall. The rotating drum 9 rotates at a rotation speed according to the output of the electric motor 8, and separates the slurry supplied from the feed amount variable supply device 2 through the top end opening portion 10 into a liquid component and a solid component.

The discharge port 11 discharges the liquid component separated by the rotation of the rotary drum 9 to the outside. The lower end release portion 12 is a takeout opening for taking out the solid component scraped by the scraping amount variable type scraping device 3 to the outside of the centrifuge.

Next, the operation of the centrifuge having the above configuration will be described with reference to the drawings. FIG. 7 is a flowchart for explaining a charging step of the centrifuge in the configuration of FIG. First, when the operator selects the operation pattern of the type A via the type changeover switch 7, the control device 5 reads the operation data of the operation pattern of the type A from the parameter setting unit 4 and temporarily stores the read operation data. Hold. Next, the control device 5
Outputs a control signal corresponding to the operation data to the variable speed driving device 6, rotates the rotating drum 9 by the electric motor 8, and accelerates to the charging speed set in the parameter setting unit 4 (step S1).

When the charging speed is reached (step S
2) The control device 5 outputs a control signal to the feed amount variable supply device 2, opens the valve 2b (step S3), and starts supplying the slurry into the rotary drum 9. Then, the control device 5 controls the opening of the valve 2b of the feed amount variable type supply device 2 so as to achieve a supply speed according to the operation data (step S4), and outputs a detection signal from the charge amount detection device 1. It is detected whether or not the charging amount has been reached according to the operation data (step S
5).

The control device 5 controls the opening of the valve 2b until the charge amount is reached (steps S4, S4).
5) If the slurry adheres to the inner wall of the rotating drum 9 and the detection signal is output from the charge amount detection device 1, the control device 5 closes the valve 2b (Step S6). By this charging step, the slurry adheres to the inner wall of the rotating drum 9.

Next, the operation of the centrifuge in the acceleration step will be described with reference to the flowchart of FIG. When the charging step is completed, the control device 5 outputs a control signal for accelerating the rotational speed to the variable speed drive device 6 based on the operation data, and accelerates the rotational speed of the rotary drum 9 (step S11). Then, the rotating drum is accelerated until the intermediate swing-off speed set by the operation data is reached (Step S12). When the intermediate swing speed is reached,
The control device 5 controls the rotation speed of the rotating drum 9 to be maintained (step S13), and detects whether or not the intermediate swing-out time set by the operation data has elapsed based on the built-in clock ( Step S14).

When the intermediate swing-out time has elapsed, the control device 5 outputs a control signal to the variable-speed drive device 6 based on the operation data to further accelerate the rotating drum 9 (step S15). When the rotation speed reaches the rotation speed set by the operation data, the rotation speed is maintained (Step S).
17).

Next, the operation of the centrifugal separator in the shaking-off process will be described with reference to FIG. When the acceleration process is completed, the control device 5 maintains the rotation speed of the rotating drum 9 (step S21), and detects whether or not the swing-out time according to the operation data has elapsed based on a built-in clock. When the shake-off time has been reached (step S2
2), the control device 5 ends the swing-out step.

Next, the operation of the centrifuge in the deceleration step will be described with reference to the flowchart of FIG.
When the swing-off process is completed, the control device 5 starts a deceleration process, outputs a control signal to the variable-speed drive device 6 based on the operation data, and reduces the rotation speed of the rotary drum 9 (step S31). Next, the control device 5 detects whether or not the number of rotations after deceleration set by the operation data has been reached (step S32). Then, when the number of rotations after deceleration has been reached, the control device 5 maintains the rotation speed of the rotary drum 9 (step S33), and ends the deceleration process.

Next, the operation of the centrifuge in the scraping step will be described with reference to the flowchart of FIG. When the deceleration process is started, the control device 5 detects whether or not the rotation speed of the rotary drum 9 has reached the scraping speed set by the operation data (step S41). When the rotation speed of the rotary drum 9 reaches the scraping speed, the control device 5 outputs a control signal to the scraping amount variable type scraping device 3 to bring the scraper 3b into contact with the inner wall of the rotary drum 9 and operate. It is lowered in the axial direction at the moving speed according to the type set by the data (step S4
2). Then, the control device 5 lowers the scraper 3b until it reaches the lower surface of the rotating drum 9 (step S4).
3) When the scraper 3b reaches the lower surface of the rotating drum 9 (step S43), the scraper 3b is separated from the rotating drum 9, raised, and returned to the original position (step S4).
4). The solid component scraped by the scraper 3b is taken out of the centrifuge from the lower end release portion 12.

Here, the relationship between the deceleration step and the scraping step will be described in more detail with reference to FIG. The deceleration step is a step of decelerating from the swing-off speed to the rotation speed after deceleration. As shown in FIG. 12, even when the rotation speed of the rotary drum 9 is decelerating in the deceleration step, the speed reaches the scraping speed. Then, the scraper 3b is lowered to start the scraping process. At this time, the deceleration step and the scraping step are performed simultaneously.

The charging step, the accelerating step, the shaking-off step, the decelerating step, and the scraping step described above are defined as one batch.
When the scraping process is completed, the rotation speed of the rotating drum 9 is also increased to the charging speed, and the process proceeds to the charging process. After one batch is completed, the next charging step is started without stopping the rotation of the rotating drum 9.

According to this embodiment, the intermediate swing-off step is performed in the acceleration step. Depending on the type, the speed of separation between the liquid component and the solid component of the slurry is different, and there is also a type in which the flow state of the slurry does not stop even during the acceleration after charging is completed, and the flow state continues up to a high speed region. If the slurry in the rotating drum 9 flows irregularly in the high-speed range, the rotation of the rotating drum 9 may be disrupted and the operation may be difficult. For this reason, since the above-mentioned intermediate shaking-off process is provided according to the type, the slurry in the rotating drum 9 can be stabilized, and the dewatering efficiency can be further improved.

In the scraping process in the above-described embodiment, when the rotation speed after deceleration is reached, the rotation speed is maintained and the scraping process is performed. However, as shown in FIG. , The rotation speed of the rotating drum 9 may be increased while the scraping process is being performed. Depending on the type of the slurry, the crystal size of the solid component (sugar crystal) is different, and the hardness of the solid component after the shaking-off step is also different. Therefore, the torque at which the scraper 3b scrapes the solid component differs depending on the type and the charge amount. . Therefore, when the scraper 3b is brought into contact with the inner wall of the rotary drum 9, the rotation speed is reduced, and after the scraper 3b comes into contact with the inner wall, the rotation speed is increased, so that the scraper 3b starts scraping. Shock can be reduced. Also, scraper 3
By increasing the number of revolutions after the contact of b, the time of the process in one batch can be reduced. Also,
By changing the scraping speed, it is possible to prevent the solid component from being left unscrewed and to prevent the scraper 3b from being broken. Furthermore, the rotation speed may be increased or decreased during scraping according to the type.

Next, a second embodiment will be described.
In the first embodiment, the case where the charge amount detection device 1 is mounted so that the detection arm 1a is at a predetermined height in the rotary drum 9 has been described. A case where the detection arm 1a of the charge amount detection device 1 is moved in the axial direction of the rotating drum 9 will be described.

The charged state (adhered state) of the slurry in the rotary drum 9 changes according to the charging speed depending on the type of the slurry. As shown by reference numeral 71 in FIG. 13, it is desirable that the slurry is uniformly charged in the upper portion (reference numeral 75) and the lower portion (reference numeral 76) of the inner wall of the rotating drum 9. However, depending on the size of the crystal and the like, depending on the type, the inner wall is not uniformly charged, and as shown by reference numeral 72, the slurry is thin at the upper portion (reference numeral 75).
The lower part (reference numeral 76) may be thickly charged.

For this reason, the charge amount detecting device 1 in this embodiment sets the detection position of the detection arm 1a in the axial direction (reference numeral) of the rotating drum 9 based on a control signal output from the control device 5 according to the operation data. 77) It can be moved to change the detection position height in the axial direction. As a result, the height of the detection position can be changed according to the properties of a plurality of types, so that the charge amount can be accurately measured and detected.

Next, a third embodiment will be described.
In this embodiment, an acceleration / deceleration pattern will be described with reference to FIG. That is, in the acceleration step and the deceleration step, a constant-time acceleration / deceleration pattern (reference numeral 81) in which acceleration / deceleration is performed at a predetermined slope (time) regardless of the load amount (for example, the slurry charge amount). On the other hand, even if the acceleration (deceleration) time changes,
There are two patterns, an acceleration / deceleration pattern (reference numeral 82) due to a current limitation in which acceleration (deceleration) is always performed by the rated torque or constant output of the drive unit 8 by flowing a predetermined current.

Either of these is applied depending on the kind in the following cases. The crystal size differs depending on the type, and the dehydration efficiency of the supplied slurry changes depending on the inclination at the time of acceleration.
It is desirable to apply a constant-time acceleration / deceleration pattern when it is desired to always make the operation cycle constant in consideration of the smoothing of the peak power and the facility capacity before and after.

On the other hand, even if the amount of load fluctuates, an acceleration / deceleration pattern based on current limitation is applied when the process time of one batch is reduced by making maximum use of the force of the driving machine 8. That is, is applied to the case where the operation to increase the productivity by maximizing the rated capacity of the driving machine 8 is performed.

In the above-described embodiment, the speed at which the scraper 3b is brought into contact with the rotary drum 9 may be controlled so as to be changed according to the type.

Operation data for realizing the above is set in advance in the parameter setting unit 4 according to the type of product, and based on the operation data, the driving device 8 is controlled by the control device 5 or in the pattern shown in FIG. Control. In this case, the acceleration step and the deceleration step may be used separately.

A program for realizing the functions of the control device 5 and the parameter setting unit 4 in FIG. 1 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read by a computer system. The execution may be performed to perform construction management. Here, the “computer system” includes an OS and hardware such as peripheral devices.

The “computer-readable recording medium” is a portable medium such as a floppy (registered trademark) disk, a magneto-optical disk, a ROM, a CD-ROM, or a storage device such as a hard disk built in a computer system. That means. Further, a "computer-readable recording medium" refers to a communication line for transmitting a program via a network such as the Internet or a communication line such as a telephone line, and dynamically holds the program for a short time. In this case, it is also assumed that a program holding a program for a certain period of time, such as a volatile memory in a computer system serving as a server or a client in that case, is included.
Further, the above-mentioned program may be for realizing a part of the above-mentioned functions, or may be for realizing the above-mentioned functions in combination with a program already recorded in a computer system.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes a design and the like within the scope of the present invention. It is.

[0056]

As described above, according to the present invention, at least one of the operation process and the rotation speed of the rotary drum is set in advance as operation data, and operation is performed based on the operation data. Therefore, it is possible to deal with a plurality of types without performing an operation of changing various set values and an operation of changing settings on site. As a result, it is possible to reduce the time required for various setting change operations without performing various operations each time the product type is changed, to reduce errors in the change operation by the operator, and to reduce variations in product quality. An effect that can be reduced is obtained.

According to the present invention, the intermediate swing-out step is performed during the acceleration of the rotation speed of the rotary drum in the acceleration step based on the operation data of the parameter setting unit, so that the liquid component of the slurry is separated to some extent. And then increase the rotation speed of the rotating drum,
Thereby, it is possible to reduce the imbalance of the rotating drum, prevent the operation stoppage caused by the imbalance of the rotating drum, and increase the dewatering efficiency.

Further, according to the present invention, the scraping device is moved at a moving speed corresponding to the kind in the scraping process based on the operation data set in the parameter setting unit, so that the crystal of the product is destroyed. Can be reduced, and the effect of improving the quality of the product can be obtained.

According to the present invention, control is performed such that a current of a predetermined value flows through the drive unit in the acceleration process based on the operation data set in the parameter setting unit. And the effect that the time required for the production process can be shortened by utilizing the maximum.

Further, according to the present invention, the acceleration is controlled so as to perform the acceleration step according to the preset time based on the operation data set in the parameter setting unit. In this case, the peak power can be smoothed, and the operation cycle can always be kept constant.

Further, according to the present invention, the scraping step is performed when the rotation speed of the rotary drum falls below the predetermined rotation speed even during the deceleration step, so that the time required for the manufacturing step is reduced. Can be further reduced.

Further, according to the present invention, the supply unit is controlled based on the operation data set in the parameter setting unit, so that the slurry is charged into the rotary drum at a supply speed corresponding to the type. This makes it possible to prevent the bias of the slurry in the rotating drum and to supply the slurry with an appropriate charge amount, so that when the viscosity of the slurry or the level in the tank changes, Also, the time required for supplying the slurry can be made constant, and the imbalance of the rotating drum 9 can be further reduced.

Further, according to the present invention, the position of the detection unit is moved in the axial direction based on the operation data set in the parameter setting unit, so that the height of the detection position in the axial direction can be changed. it can. This allows
Since the height of the detection position can be changed according to the properties of a plurality of types, the charge amount can be accurately measured and detected.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a configuration of a centrifuge to which a control system for a centrifuge according to an embodiment of the present invention is applied.

FIG. 2 is a drawing for explaining a charge amount detection device 1;

FIG. 3 is a diagram showing an example of a relationship between a level in a feed tank and an opening degree of a valve 2b when a slurry of a certain product is supplied into a rotary drum 9.

FIG. 4 is a drawing for explaining a scraping amount variable type scraping device 3;

FIG. 5 is a diagram showing an example of operation data stored in a parameter setting unit 4.

FIG. 6 is a diagram for explaining an operation process controlled by the control device 5.

FIG. 7 is a flowchart for explaining a charging step of the centrifuge in the configuration of FIG. 1;

FIG. 8 is a flowchart for explaining an acceleration step of the centrifuge in the configuration of FIG. 1;

FIG. 9 is a flowchart for explaining a shake-off step of the centrifuge in the configuration of FIG. 1;

FIG. 10 is a flowchart illustrating a deceleration process of the centrifuge in the configuration of FIG. 1;

FIG. 11 is a flowchart for explaining a scraping step of the centrifuge in the configuration of FIG. 1;

FIG. 12 is a diagram for explaining a relationship between a deceleration process and a scraping process.

FIG. 13 is a drawing for explaining a charge amount detection device 1 according to a second embodiment.

FIG. 14 is a drawing for explaining an acceleration / deceleration pattern.

FIG. 15 is a block diagram for explaining a conventional centrifuge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Charge amount detection device 1a Detection arm 1b Sensor 2 Variable feed amount supply device 2b Valve 3 Variable scraping amount scraping device 3b Scraper 4 Parameter setting unit 5 Control device 6 Variable speed drive device 8 Electric motor 9 Rotary drum

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Kazuhide Nakajo, 2-17-15 Tsukushima, Tsukushima Machine, Chuo-ku, Tokyo Inside Tsukishima Kikai Co., Ltd. (72) Etsuo Minagawa 2-17-15 Tsukushima, Tsukushima, Chuo-ku, Tokyo Machinery Co., Ltd. (72) Inventor Ken Abe 2-17-15 Tsukuda, Chuo-ku, Tokyo Tsukishima Machinery Co., Ltd. F-term (reference) 4D057 AA01 AB01 AC02 AD01 AE02 AF01 BB07 BC06 BC15 CA05 CB01 CB04 CB08

Claims (10)

[Claims] A rotating drum having a peripheral wall formed as a filter wall; a supply unit for supplying slurry into the rotating drum; a driving unit for rotating the rotating drum; A scraping device for scraping off solid components separated and adhered in the rotating drum from the rotating drum, wherein a control system of a centrifuge having at least one of a manufacturing process time and a rotating speed of the rotating drum. A parameter setting unit that stores parameters set based on a product type manufactured from the slurry as operation data, and, based on the operation data stored in the parameter setting unit, the slurry during rotation of the rotary drum. A charging step of supplying the inside of the rotary drum from the supply unit; An acceleration step of accelerating to a rotation speed, a rotation speed of the rotary drum is maintained, a shake-off step of separating the slurry in the rotary drum into a liquid component and a solid component, and the rotation speed of the rotary drum after the shake-off step. A control unit that controls a deceleration step of decelerating, and a scraping step of scraping the solid component by the scraping device when the rotation speed of the rotary drum becomes equal to or less than a predetermined rotation speed. And a centrifuge. 2. The method according to claim 1, wherein the parameter setting unit is configured to set operation data including at least one intermediate swing-off step for setting a rotation speed to a constant speed during the acceleration of the rotation speed of the rotating drum in the acceleration step. 2. The control unit according to claim 1, wherein the control unit controls, based on operation data of the parameter setting unit, to perform an intermediate swing-off process during acceleration of the rotation speed of the rotary drum in the acceleration process. centrifuge. 3. The parameter setting unit sets, in the scraping step, operation data for moving the scraping device in the axial direction of the rotary drum at a moving speed corresponding to a rotation speed of the rotary drum in accordance with a product type. The control unit performs control to move the scraping device at a moving speed according to a product type in the scraping process based on operation data set in the parameter setting unit. The centrifuge according to claim 1 or 2. 4. The parameter setting unit, wherein operation data of a predetermined value for setting a current supplied to the drive unit to a predetermined value is set according to a product type, and the control unit sets the parameter in the parameter setting unit. The centrifuge according to any one of claims 1 to 3, wherein control is performed such that a current of a predetermined value flows through the driving unit in the acceleration step based on the operation data obtained. 5. The parameter setting unit, wherein the time at which the acceleration step is performed is set in advance as operation data according to a product type, and the control unit sets the time in advance based on the operation data set in the parameter setting unit. 2. The method according to claim 1, wherein the control is performed so as to perform an acceleration process according to the set time.
The centrifuge according to any one of claims 1 to 3. 6. The parameter setting unit, wherein the time at which the deceleration process is performed is set in advance as operation data according to a product type, and the control unit sets the time in advance based on the operation data set in the parameter setting unit. 2. The control device according to claim 1, wherein the deceleration process is controlled according to the set time.
The centrifuge according to any one of claims 1 to 5. 7. The control means according to claim 2, wherein, based on the operation data set in the parameter setting unit, when the rotation speed of the rotary drum becomes lower than a predetermined rotation speed even during the deceleration process. The centrifuge according to any one of claims 1 to 6, wherein the centrifuge is controlled to perform a scraping step. 8. The parameter setting unit, wherein operation data for determining a supply speed of the slurry supplied from the supply unit is set according to a product type, and the control unit is set in the parameter setting unit. The centrifuge according to any one of claims 1 to 7, wherein the supply unit is controlled based on the operation data so as to have a supply speed corresponding to the operation data in the charging step. 9. The centrifugal separator further includes a detection unit for detecting an amount of slurry adhered to an inner wall of the rotary drum, and the parameter setting unit sets the detection unit according to a product type to the rotary drum. The data of the detected position height in the axial direction is set as operation data, and the control unit moves the detection unit to the detected position height according to the operation data set in the parameter setting unit. The centrifuge according to any one of claims 1 to 8, wherein the centrifuge is controlled. 10. The parameter setting unit stores operation data for determining a predetermined charge amount to be supplied to the inside of the rotary drum in accordance with a product type. The centrifuge further includes an inner wall of the rotary drum. A detection unit for detecting an amount of slurry attached to the drum, wherein the control unit determines a predetermined charge amount stored in the parameter setting unit by a thickness t of the slurry in the rotating drum.
Controlling the rotation of the rotating drum in the horizontal direction to a position of a slurry thickness t corresponding to a predetermined charge amount, based on the conversion data. After rotating to the position of the thickness t of the slurry in the horizontal direction of the rotating drum based on an instruction from the control unit, when the slurry reaches the thickness t, it is determined that the predetermined charge amount has been reached. The centrifuge according to any one of claims 1 to 8, wherein the centrifugal separator outputs a detection signal indicative of the detected signal.