JP3457640B2 - centrifuge - Google Patents

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 product types.

[0002]

2. Description of the Related Art Conventionally, batch type centrifuges for separating solid components from slurries have been used in the food industry and the like. As an example thereof, a centrifugal separator used in the sugar refining process will be described with reference to FIG. In the constant feed amount type supply device 102, when the valve is fully opened, the slurry containing sugar crystals is charged into the rotary drum, and the valve is fully closed after the specified amount of the slurry is charged. The fixed 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 drive device 107 drives the motor 108 connected to the rotary drum based on the command value output from the control device 106.

The fixed speed scraping device 103 scrapes the rotating rotating drum by moving 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
, The rotation speed of the rotating drum is manually set.
The operation time of each process of the one-product type timer setting device 105 is preset. The control device 106 outputs a command value for controlling the rotation speed of the rotary drum based on the setting values set by the manual variable speed setting device 104 and the one-product type timer setting value 105.
07, and controls the operation of each part of the device.

[0004]

However, the above-mentioned centrifuge has the following problems. 1) Since the slurry was charged into the rotary drum by opening or closing the valve fully, when the slurry having a low viscosity was charged, the slurry was charged into the rotary drum at an unnecessarily high speed. , The slurry was unevenly distributed in the rotating drum, and the balance of the rotating drum was lost.

2) The fixed charge amount detecting device 101 is
Since the position for detecting the thickness of the slurry is mechanically fixed, the position for the worker to detect has to be adjusted every time the input amount is changed due to the change in the type of the slurry to be input. 3) In order to move at a constant speed in the axial direction of the rotary drum of the fixed speed scraping device 103 to scrape off the solid component,
Depending on the variety, there was a problem that sugar crystals were destroyed during scraping, resulting in poor quality. 4) Since the rotation speed of the rotating drum and the operating time of each process had to be set manually, the worker had to change the setting each time the type of slurry or the amount of slurry changed. 5) In particular, in the cases of 2) and 4) described above, in order to deal with various types, it is necessary to perform an operation of changing various set values via the control device, an operation of changing the setting on the site, etc. In addition, it requires a lot of complicated work to perform various operations, and in addition, it takes time to change the settings, and workers may make mistakes in the changing operations, resulting in variations in product quality. There was a problem that it would end up.

The present invention has been made in view of such circumstances, and an object thereof is to provide a centrifuge capable of coping with a plurality of types.

[0007]

In order to achieve the above object, the invention according to claim 1 of the present invention provides a rotary drum having a peripheral wall formed as a filter wall, and a slurry is supplied into the rotary drum. And a drive unit for rotating the rotary drum, and a scraping device for scraping from the rotary drum the solid component separated from the liquid component and attached to the rotary drum by rotating 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 rotating drum stores a parameter set unit based on the type of product manufactured from the slurry as a parameter setting unit, and Based on the operation data stored in the parameter setting unit, the slurry is supplied from the supply unit while the rotating drum is rotating. A charging step of supplying into the rolling drum, an accelerating step of accelerating the rotation speed of the rotating drum to a predetermined rotation speed, a rotation speed of the rotating drum, and maintaining the rotation speed of the rotating drum to a liquid component and a solid component. And a deceleration step of decelerating the rotation speed of the rotating drum after the shaking off step, and the solid component by the scraping device when the rotation speed of the rotating drum becomes equal to or lower than a predetermined rotation speed. and a control unit for controlling the scraping step of scraping, the parameter setting Yoo
Knit is the rotation speed of the rotating drum in the acceleration process
Fewer intermediate swing-off processes that keep the rotation speed constant while accelerating
Operation data including at least one process is set according to the product type
The parameter setting unit is
Rotation in the acceleration process based on the driving data
Perform intermediate swing-off process while accelerating drum rotation speed
It is characterized by controlling as described above.

[0008]

In the centrifuge described above, the parameter setting unit may move the scraping device 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 product type, the control unit, 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 product type. It is characterized in that it is controlled to move.

Further, according to the present invention, in the above-described centrifuge, the parameter setting unit has operation data of a predetermined value for setting a current supplied to the drive unit to a predetermined value according to a product type, The control unit is based on the operation data set in the parameter setting unit,
In the accelerating step, the driving unit is controlled so that a current having a predetermined value flows.

In addition, in the centrifuge described above, the present invention is characterized in that the parameter setting unit is set in advance as operation data in accordance with a product type, and the control unit sets the parameter setting. It is characterized by performing control so as to perform an acceleration process according to a preset time based on the operation data set in the unit.

Further, in the present invention, in the above-described centrifuge, the parameter setting unit is preset as operation data of time for performing the deceleration step in accordance with a product type, and the control unit sets the parameter setting. It is characterized in that control is performed so as to perform a deceleration process according to a preset time based on the operation data set in the unit.

Further, according to the present invention, in the above-mentioned centrifuge, the control means controls the rotation speed of the rotary drum based on the operation data set in the parameter setting unit even during the deceleration process. It is characterized in that control is performed so that the scraping step is performed when the rotation speed becomes equal to or lower than a predetermined rotation speed.

Further, according to the present invention, in the above-described centrifuge, the parameter setting unit is set with operation data for determining a supply rate of the slurry supplied from the supply section according to a product type, and the control is performed. The means controls the supply unit based on the operation data set in the parameter setting unit so that the supply speed in the charging step corresponds to the operation data.

Further, according to the present invention, in the above-mentioned centrifuge, the centrifuge further has a detection unit for detecting the amount of slurry attached to the inner wall of the rotary drum, and the parameter setting unit includes: Data of the detection position height in the axial direction of the rotating drum is set as the operation data in the detection unit according to the type, and the control unit detects the detection position according to the operation data set in the parameter setting unit. It is characterized in that the detection unit is controlled to move to the height. Further, according to the present invention, the parameter setting unit stores operation data for determining a predetermined charge amount to be supplied into the rotary drum according to a product type, and the centrifuge further includes an inside of the rotary drum. The control unit has a detection unit that detects the amount of the slurry attached to the wall, and the control unit has conversion data that converts the predetermined charge amount stored in the parameter setting unit into the thickness t of the slurry in the rotating drum. With
Based on the conversion data, the detection unit is controlled to rotate in the horizontal direction of the rotating drum to a position of the slurry thickness t corresponding to a predetermined charge amount, and the detection unit receives an instruction from the control unit. Based on the above, after rotating the rotating drum to the position of the thickness t of the slurry in the horizontal direction, when the slurry reaches the thickness t, a detection signal indicating that the predetermined charge amount is reached is output. And

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A centrifuge according to an embodiment of the present invention will be described below 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 suspension centrifuge will be described as an example of the centrifuge. In this figure, the charge amount detection device 1 detects the charge amount based on a control signal output from the control device 5. Here, the charge amount refers to the supply amount of the slurry to be charged into the rotary drum in one batch. This charge amount detection device 1 is composed of a detection arm 1a and a sensor 1b, and outputs a detection signal according to the thickness of sugar crystals adhering to the inside of the rotating drum to the control device 5. The charge amount detection device 1 is attached so that the detection arm 1a has a predetermined height inside the rotary drum 9.

The charge amount detecting device 1 will be described in more detail with reference to FIG. In FIG. 2, the charge amount detection device 1 rotates the detection arm 1a to a position indicated by reference numeral 1c and brings it into contact with the inner wall of the rotary drum 9 before the slurry is supplied into the rotary 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 rotary drum 9. The sensor connected to the detection arm 1a by the connecting member outputs the detection result corresponding to the pushed back amount to the control device 5 as a detection signal. In this way, the amount attached to the inner wall of the rotary drum 9 is detected, and the detection result is output to the control device 5. It should be noted that this charge amount detection device 1 is based on a control signal from the control device 5 before the slurry is supplied into the rotary drum 9 until the 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 rotary drum. Then, the supplied slurry has a thickness t
When it reaches, the sensor 1b may output a detection signal to the control device 5 that the predetermined charge amount has been reached.

Returning to FIG. 1, the variable feed type feeding device 2
Is composed of a positioner 2a and a valve 2b, and is a controller 5
Based on the control signal output from the positioner 2a
The valve 2b is opened and closed by the above, and the slurry is released from the upper end opening portion
Supply into the rotary drum 9. This positioner 2a
In addition to the opening / closing operation, the valve 2b is operated so as to have an opening degree according to the control signal. In this way, the variable feed amount feeder 2 controls the feed rate, which is the feed rate of the slurry, by controlling the opening degree of the valve 2b so that the opening degree corresponds to the control signal from the control device 5. .

When supplying to the variable feed amount type supply device 2, even if the opening of the valve 2b is constant, the feed amount accumulates the slurry to be supplied and the difference in the viscosity depending on the kind (raw material) of the slurry. Since it changes depending on the level in the feed tank (accumulation amount of slurry), the valve is opened at an opening degree according 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 to the rotary drum 9 at a time, the rotary drum 9
The slurry is not evenly attached to the inner wall of the drum, and the rotation of the rotary drum 9 becomes unbalanced. Therefore, by controlling the opening degree of the valve 2b according to the control signal from the control device 5, when a slurry having a low viscosity is charged,
When the valve opening is small and a solid slurry having a high viscosity is charged, the valve opening is increased to supply the slurry to prevent the rotation of the rotary drum 9 from being unbalanced.

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

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

The drive unit 3a is composed of, 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 and the scraper 3b may be moved. As a result, the accuracy of movement of the scraper 3b can be improved.

Further, the maximum moving speed (maximum descending speed) v1 (mm / m) for moving the scraper 3b in the axial direction.
When the width of the scraper 3b is W (mm) and the rotation speed of the rotating drum 9 is N1 (rpm), W /
From (60 ÷ N1), it is represented by the following expression (1). v1 = (W × N1) ÷ 60 (1) When the scraper 3b is lowered at a speed of v1 or higher, the solid component of the rotary drum 9 is left unscratched. For example, when the variety of the solid component is white sucrose, the rotation speed of the rotating drum 9 is set to about 50 (rpm) without considering the sugar crystals being broken and the processing situation of the next step, and the scraper 3b The moving speed depends on the capacity of the separator, but is preferably set to about 30 (mm / sec).

Returning to FIG. 1, the parameter setting unit 4
At least one of the time of the manufacturing process and the rotation speed of the rotary drum is stored in advance as operation data corresponding to each product type. An example of this operation data is shown in FIG.

As shown in FIG. 5, a charging time, an acceleration time, a deceleration time, an intermediate shake-off time, a shake-off time, and the like are preset as operation data in accordance with 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 that sets the current supplied to the drive unit 8 to a predetermined value is set as the set current value. Operation data for moving the scraping amount variable type 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 shake-off process in which the rotational speed of the rotary drum in the acceleration process is kept constant during acceleration is set as the intermediate shake-off frequency, the intermediate shake-off time, and the intermediate shake-off speed. In addition to the above, operation data for controlling each part of the device is set according to the product type.

As shown in FIG. 6, the control device 5 supplies the slurry from the variable feed amount supply device 2 to the inside of the rotary drum 9 based on the operation data stored in the parameter setting unit while the rotary drum 9 is rotating. To the charging step (reference numeral 51), an accelerating step (reference numeral 52) for accelerating the rotation speed of the rotating drum 9 to a predetermined rotation speed, and the rotation speed of the rotating drum 9 to maintain the slurry in the rotating drum 9. Shaking-off process for separating liquid components and solid components (reference numeral 5)
3) Control so as to perform. Further, the control device 5 is
A deceleration step (reference numeral 54) of decelerating the rotation speed of the rotary drum 9 after the shaking off step, and a solid component by the variable scraping amount scraping device 3 when the rotation speed of the rotary drum 9 becomes equal to or lower than a predetermined rotation speed. Scraping process (reference numeral 55)
And do control.

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

Further, the control device 5 stores in advance for each conversion table type for converting the detection result of the detection signal output from the sensor 1b into a charge amount, and outputs from the sensor 1b using this conversion table. The detection 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 variable feed amount supply device 2 to supply the slurry. Stop the supply. It should be noted that conversion data for converting the predetermined charge amount stored in the parameter setting unit 4 into the predetermined slurry thickness t in the rotary drum is stored in the control device 5. Then, the control device 5 controls the detection arm 1a to rotate in the horizontal direction of the rotating drum up to the position of the thickness t of the slurry based on this conversion data, and the charge amount detection device 1 reaches a predetermined charge amount. The supply of the slurry may be stopped when the detection signal indicating that is done is output.

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

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

The variable speed drive device 6 drives the electric motor 8 based on the 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 drive device 6. The rotary drum 9 is connected to the output shaft of the electric motor 8 and has a peripheral wall formed as a filter wall. The rotary drum 9 rotates at a rotational speed corresponding to the output of the electric motor 8 and separates the slurry supplied from the variable feed amount supply device 2 through the top end release 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 take-out port 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 centrifugal separator having the above-mentioned structure will be described with reference to the drawings. FIG. 7 is a flow chart for explaining the charging process of the centrifuge in the configuration of FIG. First, when the operator selects the operation pattern of the product type A via the product type changeover switch 7, the control device 5 reads the operation data of the operation pattern of the product 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 according to the operation data to the variable speed drive device 6, causes the electric motor 8 to rotate the rotary drum 9, and accelerates to the charge speed set in the parameter setting unit 4 (step S1).

When the charge speed is reached (step S
2) The control device 5 outputs a control signal to the variable feed amount 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 degree of the valve 2b of the feed amount variable type supply device 2 so that the supply speed corresponds to the operation data (step S4), and the detection signal is output from the charge amount detection device 1. It is detected whether or not the charge amount has been reached according to the operation data (step S
5).

The controller 5 controls the opening of the valve 2b until the charge amount is reached (steps S4, S4).
5) When 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 process, the slurry adheres to the inner wall of the rotary 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 process is completed, the control device 5 outputs a control signal for accelerating the rotation speed to the variable speed drive device 6 based on the operation data to accelerate the rotation speed of the rotating 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-off speed is reached,
The control device 5 controls so as to maintain the rotation speed of the rotating drum 9 (step S13), and detects whether or not the intermediate swing-off time set by the operation data has elapsed based on the built-in clock ( Step S14).

When the intermediate swing-off 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 rotary drum 9 (step S15). When the rotation speed set by the operation data is reached, the rotation speed is maintained (step S
17).

Next, the operation of the centrifugal separator in the shake-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 rotary drum 9 (step S21), and detects whether or not the swing-off 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-off process.

Next, the operation of the centrifuge in the deceleration process will be described with reference to the flowchart of FIG.
When the swing-off process ends, the control device 5 starts the deceleration process, outputs a control signal to the variable speed drive device 6 based on the operation data, and decelerates the rotation speed of the rotary drum 9 (step S31). Next, the control device 5 detects whether or not the number of revolutions 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 to operate. It is lowered in the axial direction at a moving speed according to the product 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 rotary drum 9 (step S43), the scraper 3b is separated from the rotary drum 9 and lifted to return to the original position (step S4).
4). The solid component scraped off by the scraper 3b is taken out of the centrifugal separator from the lower end open portion 12.

Here, the relationship between the deceleration process and the scraping process will be described in more detail with reference to FIG. The deceleration step is a step of decelerating from the shake-off speed to the post-deceleration rotation speed. However, as shown in FIG. 12, when the rotation speed of the rotating drum 9 is being decelerated in the deceleration step, when the scraping speed is reached. , The scraper 3b is lowered, and the scraping process is started. At this time, the deceleration process and the scraping process are performed simultaneously.

The charging process, the acceleration process, the shaking-off process, the deceleration process, and the scraping process described above are regarded as one batch,
When the scraping process is completed, the rotation speed of the rotary drum 9 is also accelerated to the charging speed, and the charging process is started. After the completion of one batch, the next charging process is started without stopping the rotation of the rotary drum 9.

According to this embodiment, the intermediate shaking-off process is performed in the acceleration process. Depending on the product type, the speed of separation of the liquid component and the solid component of the slurry is different, and the flow state of the slurry does not settle even after the charge is completed and during acceleration, and there is also a product type in which the flow state continues to the high speed range. If the slurry in the rotary drum 9 flows irregularly in the high speed range, the rotation of the rotary drum 9 may be disrupted, which may make the operation difficult. For this reason, since the above-described intermediate shaking-off process is provided according to the product type, the slurry in the rotary drum 9 can be stabilized, and the dehydration efficiency can be further improved.

In the scraping step in the above-described embodiment, when the rotational speed after deceleration is reached, the rotational speed is maintained and the scraping step is performed. However, as shown in FIG. The rotation speed of the rotary drum 9 may be increased while the scraping process is being performed after the temperature reaches. The size of the crystal of the solid component (sugar crystal) differs depending on the type of the slurry, and the hardness of the solid component after the shaking-off process also varies, so the torque for scraping the solid component by the scraper 3b varies depending on the type and the charge amount. . Therefore, when the scraper 3b is brought into contact with the inner side wall of the rotating drum 9, the rotation speed is decelerated, and after the scraper 3b comes into contact with the inner side wall, the rotation speed is increased, so that the scraper 3b starts to be scraped. Impact can be reduced. Also, scraper 3
By increasing the rotation speed after the contact of b, the process time in one batch can be shortened. Also,
By changing the scraping speed, it is possible to prevent the solid component from being left unscraped and prevent the scraper 3b from being broken. Furthermore, the rotation speed may be increased or decreased during scraping depending on the type of product.

Next, a second embodiment will be described.
In the first embodiment, the charge amount detection device 1 has been described in the case where the detection arm 1a is attached so as to have a predetermined height in the rotary drum 9. However, in this embodiment, depending on the type of slurry, A case where the detection arm 1a of the charge amount detection device 1 is moved in the axial direction of the rotary drum 9 will be described.

Depending on the type of slurry, the charge state (adhesion state) of the slurry in the rotary drum 9 changes according to the charge speed. As shown by reference numeral 71 in FIG. 13, it is desirable that the slurry is uniformly charged on the upper portion (reference numeral 75) and the lower portion (reference numeral 76) of the inner wall of the rotary drum 9. However, depending on the size of the crystal, etc., depending on the product 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.

Therefore, in the charge amount detection device 1 in this embodiment, the detection position of the detection arm 1a is set in the axial direction of the rotary drum 9 (reference numeral) based on the 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 detection position height can be changed according to the properties of a plurality of product 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 process and the deceleration process, a constant time acceleration / deceleration pattern (reference numeral 81) in which acceleration / deceleration is performed at a predetermined slope (time) regardless of the amount of load (for example, the amount of charge of slurry) On the other hand, even if the acceleration (deceleration) time changes,
There are two patterns, namely, an acceleration / deceleration pattern (reference numeral 82) by current limitation in which acceleration (deceleration) is always performed by the rated torque or constant output of the driving machine 8 by causing a predetermined current to flow.

Any one of these is applied depending on the product type shown below. The size of the crystals varies depending on the product type, and the dehydration efficiency of the supplied slurry changes depending on the inclination during acceleration, so if you want to keep the acceleration rate constant,
It is desirable to apply the constant time acceleration / deceleration pattern when smoothing the peak power and keeping the operation cycle constant considering the front and rear equipment capabilities.

On the other hand, if the force of the driving machine 8 is maximally utilized to shorten the process time of one batch even if the amount of load changes, the acceleration / deceleration pattern by current limitation is applied. That is, is applied when performing the operation of maximizing the rated capacity of the driving machine 8 and increasing the productivity.

In the above 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 these are set in advance in the parameter setting unit 4 according to the product type, and based on the operation data, the drive unit 8 is controlled by the control device 5 in a pattern shown by or. Control. In this case, the acceleration process and the deceleration process may be used separately.

Further, 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 this recording medium is read by the computer system. , Execution management may be performed. The “computer system” mentioned here includes an OS and hardware such as peripheral devices.

The "computer-readable recording medium" means 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. Say that. Further, the "computer-readable recording medium" means to hold a program dynamically for a short time like a communication line when transmitting the program through a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system that serves as a server or a client in that case holds a program for a certain period of time.
Further, the above program may be one for realizing some of the functions described above, and may be one that can realize the above functions in combination with a program already recorded in the computer system.

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and includes a design etc. within the scope not departing from the gist of the present invention. Be done.

As described above, according to the present invention,
At least one of the operating process and the rotating speed of the rotating drum is preset as operating data, and
Rotating speed during the acceleration of rotating speed of rotating drum in high speed process
At least one intermediate shake-off process that keeps the speed constant
Set the operation data including the above according to the type,
Based on the operating data of the rotating drum in the acceleration process
The intermediate swing-off process is performed during the acceleration of the rotation speed of
Therefore, it is possible to support multiple types of products without changing various setting values or changing settings in the field.
The liquid component of the reel to some extent, and
The rolling speed can be increased. 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 changes, and it is possible to reduce mistakes made by the operator in changing operations and to improve product quality . /> Reduces variation and the rotating drum becomes unbalanced
Of the rotary drum
It is possible to obtain the effect of preventing the generated operation stop and improving the dehydration efficiency.
Be done.

[0057]

Further, according to the present invention, the scraping device is moved at the moving speed corresponding to the product type in the scraping process based on the operation data set in the parameter setting unit, so that the crystal of the product is destroyed. It is possible to reduce the occurrence of the occurrence, and it is possible to obtain the effect of improving the quality of the product.

Further, according to the present invention, based on the operation data set in the parameter setting unit, control is performed so that a current of a predetermined value flows in the drive unit in the acceleration process, so the rated capacity of the drive machine is set. It is possible to obtain the effect that the time required for the production process can be shortened by making maximum use of

Further, according to the present invention, the acceleration rate is controlled to be constant because the acceleration process is controlled according to the preset time based on the operation data set in the parameter setting unit. In some cases, the peak power can be smoothed, and the effect that the operation cycle can always be kept constant is obtained.

Further, according to the present invention, the scraping step is performed even when the rotation speed of the rotary drum becomes equal to or lower than the predetermined rotation speed even during the deceleration step. It is possible to obtain the effect of further shortening.

Further, according to the present invention, the supply section is controlled based on the operation data set in the parameter setting unit, so that the slurry is charged into the rotary drum at the supply speed according to the product type. As a result, it is possible to prevent the deviation of the slurry in the rotating drum, and it is possible to supply the slurry with an appropriate charge amount. Therefore, when the viscosity of the slurry or the level in the tank changes. Also, the time taken to supply the slurry can be made constant, and the unbalance of the rotary drum 9 can be further reduced.

Further, according to the present invention, the position of the detecting portion is moved in the axial direction based on the operation data set in the parameter setting unit. Therefore, the height of the detected 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 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 diagram for explaining a charge amount detection device 1.

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

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

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

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

FIG. 7 is a flow chart for explaining a charging process of the centrifuge in the configuration of FIG.

8 is a flow chart for explaining an accelerating process of the centrifuge in the configuration of FIG.

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

10 is a flowchart for explaining a deceleration process of the centrifuge in the configuration of FIG.

11 is a flow chart for explaining a scraping step of the centrifuge in the configuration of FIG.

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

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

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

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

[Explanation of symbols]

1 Charge amount detector 1a Detection arm 1b sensor 2 Feed amount variable type feeder 2b valve 3 Variable scraping device 3b scraper 4 Parameter setting unit 5 control device 6 Variable speed drive 8 electric motor 9 rotating drum

Front page continued (72) Inventor Etsuo Minagawa 2-17-15 Tsukushima Machinery, Chuo-ku, Tokyo Tsukishima Machinery Co., Ltd. (72) Inventor Ken Abe 2-17-15 Tsukishima Machinery, Chuo-ku, Tokyo Tsukishima Machinery Co., Ltd. In-house (56) Reference JP-A-9-253532 (JP, A) JP-A-7-328485 (JP, A) JP-A-9-220492 (JP, A) JP-A-2001-70833 (JP, A) JP-A 59-156450 (JP, A) JP-A 11-207212 (JP, A) JP-A 3-74099 (JP, A) JP-A 3-47100 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B04B 13/00 B04B 3/00 B04B 9/10 B04B 11/02 B04B 11/08

Claims (9)

(57) [Claims] 1. A rotary drum having a peripheral wall formed as a filter wall, a supply unit for supplying slurry into the rotary drum, a drive unit for rotating the rotary drum, and a rotary drum for rotating the rotary drum to extract liquid components. In a control system of a centrifuge, which comprises a scraping device for scraping the separated solid component adhering to the inside of the rotating drum from the rotating drum, at least one of a manufacturing process time and a rotating speed of the rotating drum is A parameter setting unit that stores, as operation data, a parameter that is set based on the type of product manufactured from the slurry, and based on the operation data that is stored in the parameter setting unit, the slurry while the rotating drum is rotating. The charging step of supplying the rotating drum from the supply unit and the rotation speed of the rotating drum at a predetermined speed. An acceleration step of accelerating to a rolling speed, a rotation speed of the rotating drum is maintained, and a shaking off step of separating the slurry in the rotating drum into a liquid component and a solid component, and a rotation speed of the rotating drum after the shaking off step. A deceleration step of decelerating, and a control unit that controls a scraping step of scraping the solid component by the scraping device when the rotation speed of the rotating drum becomes equal to or lower than a predetermined rotation speed , and the parameter The setting unit is
Make the rotation speed constant while accelerating the rotation speed of the rotating drum
Operation day including at least one intermediate shake-off process
Data is set according to the product type, and the control unit controls the operation data of the parameter setting unit.
Rotation of the rotating drum in the acceleration process based on
Control to perform intermediate swing-off process during speed acceleration
A centrifuge characterized in that. 2. The parameter setting unit sets, in the scraping step, operation data for moving the scraping device in the axial direction of the rotating drum at a moving speed corresponding to the rotating speed of the rotating drum in accordance with the product type. Yes is, the control unit, according to the basis of the set operating data to the parameter setting unit, and performs control to move at a moving speed corresponding to the scraping device to breed in the scraping step The centrifuge according to Item 1 . Wherein said parameter setting unit, operating data of a predetermined value of the current supplied to the driving unit to a predetermined value Yes is set in accordance with the breed, the control unit, in the parameter setting unit The centrifuge according to claim 1 or 2 , wherein a control is performed so that a current having a predetermined value flows through the drive unit in the acceleration step based on the set operation data. 4. The parameter setting unit is preset with operation time as the operation data in accordance with the type of product, and the control unit preliminarily sets the operation data based on the operation data set in the parameter setting unit. The control is performed so that the acceleration process is performed according to the set time.
4. The centrifugal separator according to claim 3. 5. The parameter setting unit is preset with operation time as the operation data according to the type of the deceleration step, and the control unit is preliminarily set based on the operation data set in the parameter setting unit. The control is performed so that the deceleration process is performed according to the set time.
5. The centrifugal separator according to claim 4 . 6. The control means, based on the operation data set in the parameter setting unit, when the rotation speed of the rotary drum becomes equal to or lower than a predetermined rotation speed even during the deceleration step. The centrifuge according to any one of claims 1 to 5 , wherein the centrifuge is controlled to perform a scraping step. 7. The parameter setting unit is set with operation data for determining a supply rate of the slurry supplied from the supply unit according to a product type, and the control means is set in the parameter setting unit. The centrifuge according to any one of claims 1 to 6 , wherein the supply unit is controlled on the basis of the operation data so that the supply speed in the charging step corresponds to the operation data. 8. The centrifuge further has a detection unit for detecting the amount of slurry adhering to the inner wall of the rotary drum, and the parameter setting unit includes the detection unit according to the type of the rotary drum. The axial detection position height data is set as operation data, and the control unit moves the detection unit to the detection position height according to the operation data set in the parameter setting unit. 請 claim 1, characterized in that the control
The centrifugal separator according to any one of claim 7 . 9. The parameter setting unit stores operation data for determining a predetermined charge amount to be supplied into the rotary drum according to a product type, and the centrifuge further includes an inner wall of the rotary drum. The controller has a detector for detecting the amount of the slurry adhered to, and the controller controls the predetermined charge amount stored in the parameter setting unit to be the thickness t of the slurry in the rotary drum.
And having the conversion data to be converted into, and performing the control of rotating the detection unit in the horizontal direction of the rotating drum to the position of the thickness t of the slurry according to the predetermined charge amount based on the conversion data. Based on an instruction from the control unit, after rotating the rotating drum to the position of the thickness t of the slurry in the horizontal direction, when the slurry reaches the thickness t, the predetermined charge amount is reached. The centrifuge according to any one of claims 1 to 7 , wherein the centrifuge outputs a detection signal as shown.