JP3589999B2 - Screw press type filtration device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a screw press type filtration device capable of performing efficient cleaning.
[0002]
[Prior art]
Conventionally, there is a screw press type filtration device provided with a washing tube. For example, on the outer periphery of a cylindrical filter, a washing pipe having an annular shape slightly larger than this filter is provided in the rotation axis direction of the screw, and the washing liquid is filtered by a nozzle provided on the inner periphery of the washing pipe. The filter is washed by injecting it from the outer peripheral side toward the inner peripheral side of the filter.
[0003]
[Problems to be solved by the invention]
However, in the screw press type filtration device in the above-described conventional technology, particles of the processed material smaller than the water passage hole which is a filtration unit formed in the filter and filtering the processed material flow out of the filter together with the washing water. However, particles of the treated material larger than the water passage hole cannot pass through the water passage hole, and thus remain in the filter body, thereby lowering the washing efficiency.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a screw press type filtration device capable of performing efficient cleaning.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a process in which a screw is rotatably inserted inside a substantially cylindrical filter, and a processed product supplied from one end of the screw to the filter is provided. while transporting the other end by the rotation of the screw, the filtered through the filter body, a screw press type filtration apparatus for discharging from the discharge port provided on the other end, wherein when said filter body is cleaned A discharge portion for discharging a residue remaining in the filter body is provided at one end side of the filter body, and after shifting from the filtration step to the washing step, remains in the filter body when the filter body is washed with washing water. A control unit that controls the rotation of the screw in a reverse direction and discharges the residue from the discharge unit.
[0005]
Further, the present invention is characterized in that, in the above-described screw press type filtration device, an opening / closing valve provided in the discharge section and opened / closed in accordance with an instruction from the control means is provided.
Further, in the screw press type filtration device according to the present invention, the control unit may include a time period for reversely rotating the screw, a time period for conveying a residue remaining in the filter body from the discharge port to the discharge unit. It is set according to.
[0006]
Further, the present invention, in the above-mentioned screw press type filtration device, after the control unit, after shifting to a cleaning step, after discharging the processed material in the filter body by rotating the screw forward for a certain period of time from the discharge port, A back pressure valve provided at the discharge port is closed, the filter is washed with washing water, and the screw is rotated in reverse.
[0007]
Further, according to the present invention, a screw is rotatably inserted inside a substantially cylindrical filter body, and the processed material supplied from one end side of the screw to the filter body is rotated at the other end by rotation of the screw. While conveyed to the side, it is a control method for controlling a screw press type filtration device which is filtered by the filter body and discharged from a discharge port provided on the other end side, after shifting from a filtration step to a washing step, When the filter is washed with washing water, the residue remaining in the filter is discharged from a discharge unit provided at one end of the filter by rotating the screw in a reverse direction.
[0008]
Further, according to the present invention, a screw is rotatably inserted inside a substantially cylindrical filter body, and the processed material supplied from one end side of the screw to the filter body is rotated at the other end by rotation of the screw. while conveying to the side, the filtered through the filter body, there is provided a computer readable recording medium recording a control program for controlling the screw press type filtration apparatus for discharging from the discharge port provided on the other end, a filtration step After shifting to the washing step, the residue remaining in the filter body when the filter body is washed with washing water is rotated in the reverse direction of the screw, from a discharge unit provided on one end side of the filter body. It is a recording medium on which a control program for causing a computer to execute a discharging step is recorded.
[0009]
Further, according to the present invention , a screw is rotatably inserted inside a substantially cylindrical filter body, and the processed material supplied from one end side of the screw to the filter body is rotated at the other end by rotation of the screw. While conveying to the side, it is a control program for controlling a screw press type filtration device for filtering by the filter body and discharging from a discharge port provided on the other end side, after shifting from the filtration step to the washing step, Causing the computer to execute a step of reversing the rotation of the screw and discharging a residue remaining in the filter body when the filter body is washed with washing water from a discharge unit provided at one end side of the filter body. It is characterized by.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a screw press type filtration device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic block diagram showing the configuration of a screw press type filtration device according to one embodiment of the present invention. In this figure, the screw 4 has a screw blade 4B spirally formed on the outer periphery of a screw shaft 4A about an axis O, and is rotatably supported by bearings 5,5. A driving unit 50 for rotating the screw 4 is connected to an end of the screw shaft 4A supported by the bearing 5 at the other end of the screw 4.
[0011]
The screw 4 is driven to rotate around the axis O by the drive unit 50 being connected to the screw shaft 4A, and conveys the workpiece supplied from one end to the other end. The drive unit 50 is, for example, a motor, and rotates the screw so that the rotation speed n is instructed by the drive control unit 42 of the control unit 40.
[0012]
The torsion angle and the outer diameter of the screw blade 4B of the screw 4 are both constant, while the outer periphery of the screw shaft 4A has a constant outer diameter in the range of the position P from one end side at the portion where the screw blade 4B is provided. The diameter is gradually increased in a direction from the position P toward the other end of the filter body 10. Thereby, the space between the outer periphery of the screw shaft 4A and the screw blades 4B adjacent to each other in the direction of the axis O is smaller on the other end side than on one end side. Instead of changing the outer diameter of the screw shaft 4A so as to increase at the other end, the pitch of the screw blades 4B is reduced toward the other end while the outer diameter of the screw shaft 4A is constant. May reduce the space. Alternatively, the space may be reduced at the other end by increasing the outer diameter of the screw shaft 4A and decreasing the pitch of the screw blades 4B at the other end.
[0013]
The filter 10 has a substantially cylindrical shape, and the screw 4 described above is inserted into the inner periphery of the filter 10. Thereby, while the processed material is conveyed from one end to the other end by the screw 4, it is dehydrated and filtered by the filter body 10.
As shown in FIG. 2, between the pair of annular plate-shaped flanges provided at both ends in the center axis direction, the filter body 10 has a plurality of wedge wires 11 each having a tapered cross section on the outer peripheral side. And a filter section 12 for filtering the above-mentioned processed material is formed on the body periphery thereof by being attached at a very small filtration interval. For example, as shown in FIG. 2, wedge wires 11... Are disposed on the filter body 10 so as to extend in the central axis direction of the filter body 10, that is, in the axis O direction.
[0014]
As shown in FIG. 3, a washing pipe 19 for washing the filter 10 by spraying a cleaning liquid (hereinafter, referred to as “wash water”) L onto the filter 10 is provided on the outer periphery of the filter 10. The screw 4 is disposed so as to extend in the rotation axis O direction. On the outer periphery of the washing tube 19, a large number of nozzles 19A are arranged in series at equal intervals in the direction of the axis O, and their nozzle holes are opened toward the axis O in a cross section orthogonal to the axis O. It is provided as follows. The washing pipe 19 is provided with a water guide pipe 49 connected to a washing water pump for supplying washing water based on an instruction from the control unit 40.
[0015]
Returning to FIG. 1, a supply unit 13 for supplying a processed material is provided at one end of the filter body 10. Further, on one end side of the filter body 10, a residue discharge unit 30 is provided which discharges, when the filter body 10 is washed, the processed material remaining in the filter body 10 that is washed away with the wash water together with the wash water. . The residue discharge unit 30 is provided with an on-off valve 31 that opens and closes a valve according to an instruction from the control unit 40.
The discharge port 9 is provided at the other end of the filter body 10 and discharges the filtered product as a cake.
[0016]
The control unit 40 outputs a control signal to the driving unit 50 to rotate the screw 4 in the normal direction when filtering the processed material and to reverse the rotation of the screw 4 in cleaning the filter body 10. Further, the control unit 40 performs control to open the valve of the on-off valve 31 when rotating the screw 4 in the reverse direction, and to close the valve of the on-off valve 31 when rotating the screw 4 in the forward direction. Further, the control section 40 outputs a control signal for moving the back pressure valve 21 forward and backward to the cylinder control section 24. Further, the control unit 40 controls each unit of the apparatus (details will be described later).
[0017]
The cylinder control unit 24 controls the pressure generated by the air cylinder 22 based on a control signal from the control unit 40. The back pressure valve 21 is provided at the outlet 9 and suppresses the discharge of the processed material discharged from the outlet 9.
A piston rod 22A of the air cylinder 22 is connected to the other end (the drive unit 50 side) of the back pressure valve 21. The piston rod 22A projects and retracts toward one end in parallel with the axis O. By moving the pressure valve 21 forward and backward, the distance between the back pressure valve 21 and the end 8 can be set appropriately, and the amount of cake discharged from the discharge port 9 can be adjusted.
[0018]
The air cylinder 22 causes the back pressure valve 21 to generate a pressure (pressure of the back pressure valve) for suppressing the discharge of the processed material by the piston rod 22A. By using the air cylinder 22 as a pressurizing means for generating pressure in the back pressure valve 21, the pressure in the filter 10 can be easily controlled.
[0019]
Next, the operation of the screw press type filtration device having the above-described configuration will be described with reference to the flowchart of FIG. Here, it is assumed that the on-off valve 31 is closed before the operation is started.
First, when the operation of the screw press type filtration device is started, the control unit 40 controls a filtration process for filtering the processed material (step S1). In this filtration step, when the rotation of the driving unit 50 is transmitted to the screw shaft 4A and the processed material is sequentially supplied from the supply unit 13, the processed material is formed by the filter body 10, the screw blades 4B, and the screw shaft 4A. While being conveyed from one end of the filter body 10 to the other end by the rotation of the screw 4, the water is gradually dehydrated and filtered by the above-described space reduction.
[0020]
After the filtration step is performed, when the operator inputs an instruction to end the filtration step from the input unit 62 and instructs the start of the cleaning step, the control unit 40 controls the supply unit 13 to supply the processed material. After stopping, the screw 4 is rotated for a certain period of time, and the processed material in the filter body 10 is discharged from the discharge port 9. When the processed material in the filter body 10 is discharged from the discharge port 9, the control unit 40 outputs a control signal for closing the back pressure valve 21 to the cylinder control unit 24. The cylinder control unit 24 controls the air cylinder 22 to close the back pressure valve 21. At this time, the deposits generated when the processed material is filtered are adhered to the inner peripheral surface and the outer peripheral surface of the filter 10.
[0021]
Next, the control unit 40 outputs a control signal for stopping the rotation of the screw 4 to the drive unit 50 to stop the rotation of the screw 4 and also opens the cleaning water valve provided at the supply source of the cleaning water to perform the cleaning. The operation of the water pump is started, and washing water is injected from the washing pipe 19 to the filter 10 to control the filter 10 to be washed (step S2). And the control part 40 performs washing | cleaning of the filtration body 10 until a fixed time passes (step S3). As a result, the deposits adhering to the outer peripheral surface of the filter body 10 are washed away by the washing water, and discharged together with the washing water to the outside of the screw press type filtering device. Here, of the deposits attached to the inner peripheral surface of the filter body 10, the deposits smaller than the filtration interval of the filtration unit 12 pass through the filtration unit 12 together with the washing water and are discharged to the outside of the screw press type filtration device. You.
On the other hand, among the deposits attached to the inner peripheral surface of the filter 10, those that are larger than the filtration interval of the filtration unit 12 are washed away by the washing water, but cannot pass through the filtration unit 12, so that the lower side of the filter 10. In the form of a residue.
[0022]
Next, when a predetermined time has elapsed, the control unit 40 performs control to close the washing water valve, stop the washing water pump (step S4), and stop the injection of the washing water. Then, after a certain period of time has elapsed (step S5), the prosperous unit 40 outputs a control signal for rotating the screw 4 in the reverse direction to the drive unit 50. The drive unit 50 reversely rotates the screw 4 based on a control signal from the control unit 40 (Step S6). Further, the control unit 40 performs control to open the valve of the on-off valve 31 (step S7).
Thereby, the residue remaining on the lower side of the filter body 10 is conveyed to the on-off valve 31 side by the screw 4 rotating in the reverse direction, and is discharged from the residue discharge unit 30.
[0023]
Next, the control unit 40 outputs a control signal for stopping the rotation of the screw 4 to the drive unit 50 after a predetermined time has elapsed, and performs control to close the on-off valve 31 (step S9). The drive unit 50 stops rotation of the screw 4 based on a control signal from the control unit 40. When the screw 4 stops, the control unit 40 ends the cleaning process (Step S10). Thereafter, control according to the instruction from the driver is performed.
[0024]
In the embodiment described above, since the cleaning water is injected into the filter body 10 after the back pressure valve 21 is closed, the cleaning water is discharged from the discharge port 9 and mixed with the processed material after the filtration. Can be prevented.
[0025]
In the above-described embodiment, the predetermined time during which the screw 4 is rotated in the reverse direction is set according to the time during which the residue remaining in the filter body 10 is conveyed from the vicinity of the discharge port 9 to the residue discharge section 30. Is also good. Thereby, the residue in the filter 10 can be reliably discharged to the outside of the filter 10.
[0026]
Also, a program for realizing the function of the control unit 40 in FIG. 1 is recorded on a computer-readable recording medium, and the program recorded on this recording medium is read into a computer system and executed, whereby a screw press type Control in the filtration process of the filtration device may be performed. Here, the “computer system” includes an OS and hardware such as peripheral devices.
[0027]
The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage device such as a hard disk built in a computer system. 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, which dynamically holds the program for a short time. In this case, it is also assumed that a program that holds 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.
[0028]
As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments, and includes a design and the like without departing from the gist of the present invention.
[0029]
【The invention's effect】
As described above, according to the present invention, a part of the filter is provided with a discharge portion for discharging a residue remaining inside when the filter is washed, so that the filter is provided in the filter after washing. The remaining residue can be discharged out of the filter, and the effect of increasing the washing efficiency of the filter can be obtained.
Further, according to the present invention, since the discharge portion is provided at one end of the filter, the structure of the screw press type filtration device is smaller than when the discharge portion is provided at the other end where the discharge port is provided. Can be easily obtained.
[0030]
Further, according to the present invention, since the screw is rotated in the reverse direction to convey the residue in the filter to the discharge unit side, the effect of reliably discharging the residue in the filter to the outside of the filter is obtained. Can be
Further, according to the present invention, since the on-off valve that opens and closes in accordance with an instruction from the control unit is provided, it is possible to prevent the leakage of the processed material in the filter body except for cleaning the filter body. Is obtained.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram showing a configuration of a screw press type filtration device according to an embodiment of the present invention.
FIG. 2 is a drawing for explaining a filter body 10 and a washing pipe 19;
FIG. 3 is a drawing for explaining a filter body 10 and a washing pipe 19;
FIG. 4 is a flowchart for explaining the operation of the screw press type filtration device according to the present invention.
[Explanation of symbols]
Reference Signs List 4 Screw 10 Filtration body 11 Wedge wire 12 Filtration unit 19 Cleaning pipe 21 Back pressure valve 24 Cylinder control unit 30 Residue discharge unit 31 Open / close valve 40 Control unit

Claims (7)

A screw is rotatably inserted inside the substantially cylindrical filter, and the processed material supplied between the filter and the filter from one end of the screw is conveyed to the other end by the rotation of the screw. A screw press type filtration device that filters by the filter body and discharges from a discharge port provided on the other end side,
The discharge section for discharging the residue filter body remains the the filtering body when being cleaned is provided at one end of the filter body,
After shifting from the filtration step to the washing step, when the filter body is washed with washing water , a control unit that controls the rotation of the screw to reverse the residue remaining in the filter body and discharges the residue from the discharge unit. When,
A screw press type filtration device comprising: Wherein provided in the discharge section, screw press type filter apparatus according to claim 1, characterized in that it has an opening and closing valve for opening and closing in response to an instruction from the control unit. The control unit is configured to set a time for reversely rotating the screw in accordance with a time for transporting a residue remaining in the filter body from the discharge port to the discharge unit.
  The screw press type filtration device according to claim 1 or 2, wherein: The control unit, after shifting to the cleaning step, after rotating the screw forward for a certain period of time to discharge the processed material in the filter from the outlet, closes a back pressure valve provided in the outlet, and closes the filter. Wash with washing water and reverse the screw
  The screw press type filtration device according to any one of claims 1 to 3, characterized in that: A screw is rotatably inserted inside the substantially cylindrical filter, and the processed material supplied between the filter and the filter from one end of the screw is conveyed to the other end by the rotation of the screw. A control method for controlling a screw press type filtration device that filters by the filter body and discharges from a discharge port provided on the other end side,
After shifting from the filtration step to the washing step, when the filter body is washed with washing water, the residue remaining in the filter body is rotated by reverse rotation of the screw, and the discharge provided on one end side of the filter body A method for controlling a screw press type filtration device, comprising discharging from a section . A screw is rotatably inserted inside the substantially cylindrical filter, and the processed material supplied between the filter and the filter from one end of the screw is conveyed to the other end by the rotation of the screw. A computer-readable recording medium that records a control program that controls a screw press-type filtration device that is filtered by the filter and discharged from a discharge port provided on the other end side,
After shifting from the filtration step to the washing step, when the filter body is washed with washing water, the residue remaining in the filter body is rotated by reverse rotation of the screw, and the discharge provided on one end side of the filter body A recording medium on which a control program for causing a computer to execute the step of discharging from a unit is recorded. A screw is rotatably inserted inside the substantially cylindrical filter, and while the processed material supplied between the filter and the filter from one end of the screw is conveyed to the other end by the rotation of the screw, A control program for controlling a screw press type filtration device that filters by the filter body and discharges from a discharge port provided on the other end side,
  After shifting from the filtration step to the washing step, when the filter body is washed with washing water, the residue remaining in the filter body is rotated by reversing the rotation of the screw, and a discharge provided on one end side of the filter body Ejecting step
  Control program for a screw press type filtration device that causes a computer to execute the process.

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