TWI709437B - Centrifugal separation apparatus and centrifugal separation method - Google Patents

Abstract

A centrifugal separation apparatus includes: a cylindrical basket (2) which is rotated about an axis line (O) and which is provided with a filtering screen (2a) at a body portion; a pusher plate (7) which is accommodated in the basket (2) and is provided so as to be integrally rotatable with the basket (2) and movable in an axis line direction relative to the basket (2), wherein when the pusher plate (7) pushes a cake which is obtained by filtrating a processed material supplied into the basket (2) by a filtration screen (2a) toward an open end (2b) side of the basket (2) so as to discharge the cake, a relative movement velocity between the pusher plate (7) and the basket (2) in the axis line direction is set such that the relative movement velocity in a direction in which a gap (D) between the pusher plate (7) and the open end (2b) of the basket (2) in the axial line direction increases is smaller than the relative movement velocity in a direction in which the gap (D) decreases.

Description

Centrifugal separation device and centrifugal separation method

Invention field

The present invention relates to a push-type centrifugal separation device and a centrifugal separation method. The processed material supplied to a basket rotating around an axis is filtered by a filter provided in the main body of the basket, and is housed The push plate, which is integrally rotatable in the basket and movable relative to the basket in the axial direction, discharges the filter cake filtered from the processed material from the open end of the basket.

This application claims priority based on Japanese Patent Application No. 2016-133665 filed in Japan on July 5, 2016, and uses the content here.

Background of the invention

Such a push-type centrifugal separation device has been disclosed in, for example, Patent Document 1 a two-stage basket type centrifugal separation device with an outer basket and an inner basket. The outer basket is rotatable about an axis, and the inner basket is coaxial. The ground is arranged in the outer basket, rotates integrally, and advances and retreats in the axial direction relative to the outer basket. In the two-stage basket-type centrifugal separator, the processed material filtered by centrifugal separation is supplied between the push plate and the ring-shaped distributor. The push plate is supported by the outer basket. It is arranged in the inner basket so as to face the opening of the processing substance supply pipe, and the aforementioned distributor is arranged in the inner basket. There is a gap between the pressing plate and the opening of the processing object supply pipe.

In such a centrifugal separation device, the processed material supplied from the opening of the supply pipe to between the pressing plate and the distributor is deposited on the inner peripheral surface of the strainer provided in the main body of the inner basket by centrifugal force, and is filtered to form a filter cake. Furthermore, by advancing the inner basket toward the open end side of the outer basket, the filter cake is also accumulated in the axial direction of the inner basket. Then, the filter cake of the processed material is pushed by the pressing plate by the retreat of the inner basket relative to the outer basket, and is discharged to the inner peripheral surface of the outer basket. Furthermore, in this way, the filter cake of the processed material discharged to the inner peripheral surface of the outer basket is further filtered by the filter of the outer basket, and is pushed by the advancement of the inner basket to be discharged from the open end of the outer basket.

Advanced technical literature

Patent literature

[Patent Document 1] Japanese Patent Application Publication No. 2014-091093

Summary of the invention

In such a centrifugal separation device, the relative movement of the basket and the push plate in the axial direction (in the centrifugal separation device described in Patent Document 1, the advance and retreat of the inner basket with respect to the push plate) is generally performed by a hydraulic piston It is driven by hydraulic pressure. Therefore, the moving speed when moving forward is usually equal to the moving speed when moving backward. In addition, the supply amount of the processed material from the supply pipe is usually a certain amount every unit time.

When the inner basket advances relative to the push plate, the processed material will be supplied A filter screen that is easier to filter after being pressed by the pressing plate to the processed material accumulated on the inner peripheral surface of the filter screen of the inner basket. On the other hand, when the inner basket retreats with respect to the pressing plate, the processed material is stacked and supplied to the filter cake of the processed material that has been pressed by the pressing plate because the processed material is stacked on the inner peripheral surface of the filter screen of the inner basket. filter.

Therefore, if the processed material that is particularly difficult to filter is supplied, if the volume of the basket is not increased to increase the size of the centrifugal separator, when the inner basket is retracted, the filtering of the processed material will become incomplete and it is difficult to form a uniform filter cake. It may be necessary to limit the supply of processed materials.

In addition, there is also a known centrifugal separation device that is opposite to the centrifugal separation device described in Patent Document 1. The position of the axis of the basket rotation is set to be fixed, and is opposed by a push plate housed in the basket. The basket can move forward and backward in the axial direction. In such a centrifugal separation device, when the pressing plate is retracted, the processed material is supplied to the filter screen which is easy to filter after the filter cake of the processed material is pressed. In contrast, when the pressing plate advances, the processed material supplied to the processed material filter cake continuously pressed by the pressing plate is stacked. Therefore, filtration or cake formation may be incomplete.

The present invention was made under such a background, and its purpose is to provide a centrifugal separation device and a centrifugal separation method, which can promote efficient filtration of the processed material without increasing the basket capacity and other large-scale, and can increase the processing capacity. And form a uniform filter cake.

The first aspect of the centrifugal separation device of the present invention is a centrifugal separation device, which is provided with a cylindrical basket, a filter screen is provided on the main body, and the Rotating along the axis; and a pressing plate, which is housed in the basket to be integrally rotatable, and is arranged to be relatively movable in the axial direction of the basket, and the centrifugal separation device will be supplied to the basket for processing The filter cake filtered by the filter screen is pushed and discharged toward the open end of the basket by the pressing plate. The relative moving speed of the pressing plate and the basket in the axial direction is set as: The relative movement speed of the pressing plate and the open end of the basket in the direction in which the distance in the axial direction becomes larger is higher than the relative movement in the direction where the distance between the pressing plate and the open end of the basket in the axial direction becomes smaller The speed is still small.

In addition, the first aspect of the centrifugal separation method of the present invention is a centrifugal separation method in which the processed material is fed into a cylindrical basket that is provided with a filter on the main body and rotated around an axis, and the processed material is passed The filter cake filtered by the filter is pushed by a pressing plate and discharged to the open end side of the basket, and the pressing plate is accommodated in the basket and can be rotated integrally, and is arranged in a pair of the basket. Move relatively in the axial direction, the centrifugal separation method is to set the relative moving speed of the pressing plate and the basket in the axial direction to the distance between the pressing plate and the open end of the basket in the axial direction The relative moving speed in the increasing direction is smaller than the relative moving speed in the direction in which the distance between the push plate and the opening end of the basket in the axial direction decreases.

In the first aspect of such a centrifugal separation device and the first aspect of the centrifugal separation method, for example, in the centrifugal separation device described in Patent Document 1, the pressing plate is located at a fixed position in the axial direction, and the basket can be in the axial direction When moving forward and backward, the opening ends of the push plate and the basket are on the axis The direction in which the upward interval becomes larger becomes the direction when the basket advances, and the direction in which the interval becomes smaller becomes the direction when the basket retreats. Conversely, if the basket is at a fixed position in the axial direction and the push plate can move forward and backward in the axial direction, the direction in which the distance between the push plate and the open end of the basket in the axial direction increases becomes the direction when the push plate is retreated , And the direction in which the interval becomes smaller becomes the direction when the pressing plate advances.

That is, in the first aspect of the centrifugal separation device and the first aspect of the centrifugal separation method of the above-mentioned configuration, when one of the basket and the pressing plate moves relative to the other, the processed material is supplied to the inner peripheral surface of the screen stacked on the basket The relative moving speed of the filter in the easier-to-filter state after the processed material has been pushed by the pressing plate is lower than the relative moving speed when the processed material is supplied to the filter in the difficult-to-filter state where the processed material remains.

Therefore, if the capacity of the basket is the same, even if the supply amount of the processed material is increased, more processed materials can be supplied to the filtration of the basket which is easy to filter. On the other hand, if the relative movement speeds before and during such relative movement are set so that the time of one stroke of advance and retreat is the same, the relative movement speed when the processed material is supplied to the filter in a difficult-to-filter state becomes higher than the processing The relative moving speed is high when the material is supplied to the filter which is easy to filter. Therefore, the supply amount of the processed material stacked on the filter cake of the remaining processed material is reduced, and a uniform filter cake can be formed.

Therefore, according to the centrifugal separation device and the centrifugal separation method of the above-mentioned structure, even if the basket is not enlarged to increase the size of the basket, or the time of one stroke of advance and retreat is not lengthened, it is possible to supply more processed materials to a state that is easy to filter. Filters, and can suppress the supply of filters that are difficult to filter The supply of processed materials. Therefore, it is possible to achieve efficient filtration of the processed material to increase the processing volume, and to promote the formation of a uniform filter cake.

Furthermore, if the relative movement speed of the push plate with respect to the basket in the above-mentioned axial direction is set, the relative movement speed in the direction where the distance between the push plate and the open end of the basket in the axial direction becomes larger is smaller than the distance The relative moving speed in the direction of, when the ratio is too large, it becomes difficult to set the relative moving speed of one of the basket and the pressing plate to the other. Therefore, it may become impossible to reliably supply a large amount of processed material to the filter in an easy-to-filter state.

Therefore, the relative movement speed in the direction in which the distance between the push plate and the open end of the basket in the axial direction becomes larger is preferably set to change the distance between the push plate and the open end of the basket in the axial direction. The relative movement speed in the small direction is 1/4 or more. However, even if the ratio of these relative moving speeds approaches 1 and the speed difference is too small, it may become impossible to effectively achieve the above effects. Therefore, the relative movement speed in the direction in which the interval becomes larger is more preferably set to be 2/3 or less of the relative movement speed in the direction in which the interval becomes smaller.

Furthermore, setting the relative movement speed of forward and backward movement can also be applied to a situation where, for example, a conventional hydraulic piston is used for hydraulic driving to move one of the basket and the pressing plate forward and backward to the other. At this time, there will be a difference in the flow path of the hydraulic oil during forward and backward, and a speed controller can be installed to divide the flow path on the discharge side of the cylinder to make the discharge speed of the hydraulic oil different. In this case, when switching between forward and backward, the hydraulic pressure becomes unstable and it is difficult to set the predetermined relative movement speed.

Therefore, when one of the basket and the push plate is driven, the rotation of an electric motor (servo motor) transmitted to a screw shaft such as a ball screw is used to screw a nut coaxially mounted on the piston rod to the screw shaft. To convert the linear motion of the piston rod, so-called electric cylinders can be used. Furthermore, it is possible to use a cylinder liner that directly causes a piston rod to linearly move by an electric linear motor. Or it is advisable to use two or more chains to engage with each other and move forward repeatedly in a columnar shape by an electric motor, or to unhook the chain and pull it back to make a linear movement, which is the so-called snap-on actuation.器等。

As explained above, according to the present invention, even if the basket is enlarged without increasing the capacity of the basket, and the time for one stroke of advance and retreat is not lengthened, it is possible to efficiently filter the processed material, increase the processing volume, and form a uniform filter. cake. Therefore, it is possible to reduce the cost of the centrifugal separator device itself, or reduce the installation space of the device, and simplify the installation basis due to the weight reduction of the device, and the subsequent processing of the filter cake can be stabilized and easily performed.

1: Outer basket

1a: Outer filter

1b: Open end of outer basket 1

1c: Holding plate of outer basket

1d: Support shaft

2: inner basket

2a: inner filter

2b: Open end of inner basket 2

2c: Keep the board

3: shell

3a: containment ring

3b: Outlet

4: bearing

5: Spindle

6: Push shaft

7: Push plate

8: Dispersion plate

9: Supply pipe for processed material

10: Bearing box

11: Advance and retreat drive unit

11a: Electric motor

11b: cylinder box

21: Basket

21a: Filter

21b: Open end of basket 21

22: Push plate D: Interval

O: axis

Fig. 1 is a schematic cross-sectional view showing the first embodiment of the centrifugal separator of the present invention.

2 is an enlarged cross-sectional view of the periphery of the basket showing the state where the inner basket is retracted relative to the push plate (the state where the distance between the push plate and the open end of the basket in the axial direction is small) in the embodiment shown in FIG.

Figure 3 is a diagram showing the state in which the inner basket advances relative to the push plate in the embodiment shown in Figure 1 (the distance between the push plate and the open end of the basket in the axial direction is compared Large state) An enlarged cross-sectional view of the periphery of the basket.

Fig. 4 is an enlarged cross-section of the periphery of the basket showing the state in which the push plate is advanced relative to the basket in the second embodiment of the centrifugal separator of the present invention (the state where the distance between the push plate and the open end of the basket in the axial direction is small) Figure.

5 is an enlarged cross-sectional view showing the periphery of the basket in a state where the push plate is retracted relative to the basket in the embodiment shown in FIG. 4 (the state where the distance between the push plate and the open end of the basket in the axial direction is large).

Detailed description of the preferred embodiment

Fig. 1 or Fig. 3 shows the first embodiment of the centrifugal separator of the present invention, and the present invention is applied to a two-stage basket-type centrifugal separator having an outer basket and an inner basket as described in Patent Document 1. example. That is, the centrifugal separation device in this embodiment includes: a cylindrical outer basket 1 with an outer filter 1a installed on the main body and centered on the horizontal axis O; and a cylindrical inner basket 2 coaxially accommodated Inside the outer basket 1, the inner filter 2a is installed on the main body. In this first embodiment, the inner basket 2 serves as the basket in the present invention. Furthermore, as the outer filter 1a or the inner filter 2a, for example, a cylindrical wire filter or a sieve plate is used.

The circular open ends 1b, 2b are arranged at one end of the cylindrical outer basket 1 and the inner basket 2 in the axis O direction (the right end in the axis O direction in Figures 1 to 3), and the other end (Figures 1 to 3) The left end in the direction of axis O in 3) is a cylindrical shape with a bottom that is mounted and held by disc-shaped holding plates 1c and 2c. The length of the inner basket 2 in the direction of the axis O is shorter than the length of the outer basket 1 in the direction of the axis O. The inner basket 2 is accommodated in the housing 3 and rotates around the axis O integrally with the outer basket 1. Furthermore, the outer diameter of the open end 2b of the inner basket 2 is set to, for example, a ring not shown The other pressing plate of the shape is arranged at the opening end 2b and can be slidably connected to the size of the inner circumferential surface of the filter screen 1a outside the outer basket 1.

The holding plate 1c of the outer basket 1 is supported by the bearing 4 so as to be freely rotatable, and is installed on one end of the main shaft 5 inserted into the hollow inside the housing 3 along the axis O. The main shaft 5 rotates when the rotational force of a motor or the like is transmitted to a pulley (not shown), and the outer basket 1 rotates around the axis O. In addition, the pressing shaft 6 is inserted into the main shaft 5 and can be rotated integrally with a key not shown in the figure, and can advance and retreat in the axis O direction. One end of the pressing shaft 6 slidably penetrates the holding plate 1c of the outer basket 1 and is mounted on the holding plate 2c of the inner basket 2, whereby the inner basket 2 can also rotate integrally with respect to the outer basket 1 and can be placed in the outer basket 1 He is advancing and retreating in the direction of axis O.

Furthermore, the plural support shafts 1d are attached to the holding plate 1c of the outer basket 1 so as to extend from the axis O toward the outer peripheral side at intervals in the circumferential direction and extend parallel to the axis O on the one end side. The support shafts 1d slidably penetrate the holding plate 2c and protrude into the inner basket 2. At one end of the supporting shafts 1d, a disc-shaped pressing plate 7 having an outer diameter that can be slidably connected to the inner peripheral surface of the inner filter screen 2a is installed. Therefore, the pressing plate 7 and the outer basket 1 and the inner basket 2 can rotate coaxially around the axis O together, and can move relative to the inner basket 2 in the axis O direction.

Furthermore, an annular plate-shaped dispersing plate (distributor) 8 having an opening in the center and the pressing plate 7 are integrally supported on one end side of the pressing plate 7 with a gap therebetween. In addition, the supply pipe 9 of the processed material is installed and inserted into the housing 3. The supply pipe 9 passes through the opening ends 1b and 2b of the outer basket 1 and the inner basket 2 and is inserted into the opening of the dispersing plate 8. The supply port of the supply pipe 9 is in the pressing plate 7 and Open between the loose plates 8.

Furthermore, a substantially U-shaped filter cake accommodating ring 3a that opens toward the inner periphery along the cross section of the axis O is arranged on the outer periphery of the open end 1b of the outer basket 1 so as to be supported by the housing 3 and surround the open end 1b. A cake slide, not shown, is provided in the cake holding ring 3a, and after the cake discharged from the open end 1b of the outer basket 1 is received in the cake holding ring 3a, it is removed from the cake holding ring 3a through the cake slide. The discharge port 3b under the casing 3 discharges.

On the other hand, the other end of the pressing shaft 6 protrudes than the other end of the main shaft 5, and the other end of the protruding pressing shaft 6 is connected to the forward and backward driving section 11 through the bearing box 10, and the forward and backward driving section 11 allows the push The rotation of the pressing shaft 6 together with the inner basket 2 moves the pressing shaft 6 forward and backward in the axis O direction. The bearing box 10 is configured as follows: the other end of the pressing shaft 6 is rotatably supported by a bearing not shown in the figure, and the pressing shaft 6 that rotates integrally with the main shaft 5 does not rotate, and the bearing can be It is mounted in the axis O direction so as to advance and retreat integrally with the pressing shaft 6.

Furthermore, the forward and backward drive unit 11 in this embodiment is driven by an electric motor, and in particular, transmits the rotation of the electric motor (servo motor) 11a to a screw shaft such as a ball screw (not shown). The ball screw is on the axis O It is arranged in the cylinder box 11b to extend in the direction. A nut coaxially mounted on a piston rod (not shown) is screwed to the screw shaft, and the forward and retreat drive unit 11 converts the rotation of the electric motor 11a into linear motion of the piston rod through the screw shaft and the nut. In this way, the forward and backward driving unit 11 is a so-called electric cylinder, or servo cylinder, or electric actuator.

In this way, the advance and retreat drive unit 11 performs the advance and retreat of the pressing shaft 6 Incidentally, the relative moving speed of the inner basket 2 and the pressing plate 7 in the axis O direction is set as follows. That is, the relative moving speed in the direction where the distance D between the pressing plate 7 and the open end 2b of the inner basket 2 in the direction of the axis O increases is set to be higher than that of the pressing plate 7 and the open end 2b of the inner basket 2 in the direction of the axis O The relative moving speed in the direction in which the interval D decreases is small. Furthermore, to set the relative moving speed in this way, it can be controlled during the operation of the centrifugal separation device to appropriately adjust the relative moving speed, and it can also be preset before the operation to perform such control. Such control can be performed automatically and easily by inputting a program in advance into a control unit such as a computer including a well-known component such as a CPU or a memory for controlling the electric motor 11a.

Specifically, in this embodiment, the pressing plate 7 is fixed in the axis O direction through the support shaft 1d and the holding plate 1c of the outer basket 1 and is fixed in the axis O direction, and the inner basket 2 advances and retreats in the axis O direction through the pressing shaft 6. Therefore, as shown in Figures 1 and 2, from the state of retreating the inner basket 2, by advancing the inner basket 2 toward one end side of the axis O, as shown in Fig. 3, the opening end 2b of the inner basket 2 The pressing plates 7 are separated, and the interval D becomes larger. The relative movement speed of the outer basket 1 and the inner basket 2 in the direction in which the distance D becomes larger is set to be higher than that by retreating the inner basket 2 from the state shown in FIG. 3 toward the other end side, the opening end 2b approaches the pressing plate 7 The moving speed in the direction where the interval D decreases is small.

In one embodiment of the centrifugal separation method of the present invention using the centrifugal separation device constructed in this way, the outer basket 1 and the inner basket 2 are rotated integrally, and the solid-liquid turbidity is supplied in a constant amount from the supply pipe 9 every unit time的处理物 (slurry). The supplied processed material hits the pressing plate 7 and is dispersed from between it and the dispersing plate 8 to the outer peripheral side by centrifugal force, and adheres to the inner The inner peripheral surface of the filter 2a within the basket 2. The processed material is supplied in this way, and as shown in FIGS. 1 and 2, the inner basket 2 is moved forward from the state where the inner basket 2 has retreated. Then, the processed material is continuously accumulated on the inner peripheral surface of the filter mesh 2a in the advancing inner basket 2 in the direction of the axis O, and is filtered by centrifugal force to form a filter cake (filter cake) of the processed material.

Secondly, as shown in Fig. 3, the inner basket 2 which is moving forward is shown in Fig. 3. When reaching the end of the forward stroke and then retreating, the filter cake of the processed material accumulated on the inner peripheral surface of the inner filter screen 2a is opposed to the retreating inner basket 2 The pushing plate 7 that advances to the ground is pushed to one end of the inner basket 2 in sequence. The filter cake of the processed material deposited on the one end side is discharged from the open end 2b toward the inner peripheral surface of the filter 1a outside the outer basket 1, and is continuously deposited in the axis O direction and further filtered by centrifugal force.

In this way, the filter cake deposited on the inner peripheral surface of the outer filter screen 1a and filtered by the next advancement of the inner basket 2 at the end of the stroke of the retreat will be received by the open end 2b of the inner basket 2 or set at the open end The other pressing plates (not shown) of 2b are sequentially pressed to one end. Next, the cake of the processed material deposited on the one end side is discharged from the open end 1b of the outer basket 1 toward the cake holding ring 3a, and is discharged from the discharge port 3b of the housing 3 through the chute as described above.

In this way, in the centrifugal separation device and centrifugal separation method described above, the relative movement speed of the inner basket 2 and the pressing plate 7 in the axis O direction is set as follows when filtering the filter cake by centrifugal separation. That is, compared to the moving speed of the inner basket 2 in the backward direction when the distance D between the pressing plate 7 and the opening end 2b of the inner basket 2 in the direction of the axis O becomes smaller, the pressing plate 7 When the distance D from the opening end 2b of the inner basket 2 in the direction of the axis O increases, the moving speed of the inner basket 2 in the forward direction becomes smaller. That is, if it is the same centrifugal separation device and centrifugal separation method in which the time of forward and backward 1 stroke is the same as the conventional moving speed of the inner basket forward and backward, the moving speed of the inner basket 2 in the present embodiment will be lower than that of the conventional one. .

Therefore, when the inner basket 2 advances, the processed material supplied from the supply pipe 9 will retreat from the inner basket 2, and as time elapses, the processed material has been gradually retreated by the previous inner basket 2 and is pushed by the pressing plate 7 After pressing, in a state where there are fewer processed materials accumulated, a lot of processed materials are accumulated on the inner peripheral surface of the screen 2a. Therefore, even if the capacity of the inner basket 2 is the same as that of the conventional inner basket 2, more processed objects can be supplied to the inner peripheral surface of the inner filter 2a in a state where the accumulated processed objects are reduced and the filter is easily filtered.

On the other hand, in the centrifugal separation device and the centrifugal separation method of the above-mentioned structure, compared to the conventional case where the time of 1 stroke is the same and the moving speeds of forward and backward are equal, the inner basket 2 retreats and accumulates on the inner filter 2a When the processed object on the inner peripheral surface is pressed by the pressing plate 7, the moving speed of the inner basket 2 increases. Therefore, the amount of the processed material stacked on the inner peripheral surface of the filter screen 2a in the straight end side of the pressing plate 7 in the axis O direction can be reduced. Therefore, it is possible to suppress the amount of supply of the processed material to the inner screen 2a in a state where the processed material is still accumulated and is difficult to filter.

Therefore, according to the centrifugal separation device and the centrifugal separation method constructed in this way, there is no need to increase the capacity of the inner basket 2 (basket) in order to increase the size of the centrifugal separation device, and it is not necessary to lengthen the inner basket 2 relative to the pressing plate 7 The time to move forward and backward 1 stroke. By making it easier to handle things In the filtering state, the supply amount of the filter 2a is increased, and more processed objects can be processed reliably and efficiently in one stroke. Furthermore, it is possible to suppress the supply of the processed material to the filter screen 2a in a difficult-to-filter state, thereby forming a uniform filter cake including the entire length of the inner basket 2. Therefore, it is possible to reduce the cost or installation space of the centrifugal separation device, and to simplify the installation basis achieved by the weight reduction of the device, and the post-processing of the filtered cake can also be stably and easily performed.

In addition, in the present embodiment, for setting the moving speed of the inner basket 2 relative to the pressing plate 7 in this manner, an electric motor 11a is used as the forward and backward driving unit 11 that advances and retreats the inner basket 2 through the pressing shaft 6. However, even if the pushing shaft 6 and the inner basket 2 are driven to advance and retreat by hydraulic driving as in the prior art, the difference in the flow path of the hydraulic oil between the forward and backward time or the installation of a speed controller can be used. Or by dividing the flow path on the discharge side of the cylinder to set the difference in the discharge speed of the hydraulic oil to set the moving speed. However, in this case, there may be a problem of unstable hydraulic pressure during forward/backward switching peculiar to hydraulic driving, and it is difficult to reliably set a predetermined relative movement speed.

In this regard, the advance and retreat drive unit 11 using the electric motor 11a as in the present embodiment has a high standby state, and the movement direction can be quickly changed even when the advance and retreat switch is performed. Furthermore, the moving speed can be set reliably and stably, which is particularly suitable for the case where the relative moving speed of the inner basket 2 to the pressing plate 7 is set to different sizes in the centrifugal separation device and centrifugal separation method constructed as described above.

Furthermore, the advance and retreat driving portion 11 using such an electric motor 11a can be used as in the above-mentioned embodiment, using a screw shaft and a nut to connect the electric The rotation of the motor 11a is converted into an electric cylinder for linear movement of the piston rod. In addition, it is possible to use a cylinder liner that directly moves the piston rod linearly by an electric linear motor. Furthermore, it is also possible to use two or more chains to engage with each other and to move forward repeatedly in a columnar shape by an electric motor, or to release the chain to pull it back and retreat for linear motion, which is the so-called buckle type Actuator, etc.

Next, Fig. 4 and Fig. 5 show a second embodiment of the centrifugal separator of the present invention. The parts common to the centrifugal separator of the first embodiment are given the same reference numerals, and the description is omitted.

In the centrifugal separator of the second embodiment shown in FIGS. 4 and 5, the other end side part in the axis O direction, which is not shown, is the same as that of the centrifugal separator of the first embodiment, so illustration is omitted.

In the first embodiment, the structure is such that the inner basket 2 is housed in the outer basket 1 to be integrally rotatable, and the inner basket 2 is mounted on the pressing shaft 6 to advance and retreat in the axis O direction, and the outer basket 1 is supported by the outer basket The pressing plate 7 of 1 is held at a fixed position in the axis O direction, whereby the pressing plate 7 can relatively move in the axis O direction with respect to the basket (inner basket 2). In the second embodiment, a single basket 21 with a filter screen 21a provided on the main body and an open end 21b at one end in the direction of the axis O is attached to one end of the main shaft 5 through a holding plate 21c. The basket 21 is held at a fixed position in the direction of the axis O, and a pressing plate 22 slidably connected to the outer diameter of the inner peripheral surface of the filter screen 21a is coaxially mounted on one end of the pressing shaft 6 inserted into the holding plate 21c, and Advance and retreat in the axis O direction. Thereby, the pressing plate 22 can relatively move the basket 21 in the axis O direction.

Therefore, in the second embodiment, the basket 21 and the open end of the basket 21b is at a fixed position in the direction of the axis O, and the pressing plate 22 can move forward and backward in the direction of the axis O. Therefore, the direction in which the distance between the pressing plate 22 and the opening end 21b of the basket 21 in the direction of the axis O increases becomes the direction when the pressing plate 22 is retracted, and the direction where the distance decreases becomes the direction when the pressing plate 22 advances.

In addition, in this embodiment, the relative movement speed of the pressing plate 22 and the basket 21 in the axis O direction is also set as follows. That is, from the state in which the pressing plate 22 shown in FIG. 4 advances relative to the basket 21 and the distance D between the pressing plate 22 and the open end 21b of the basket 21 in the axis O direction is small, to the pressing plate 22 and the basket shown in FIG. 5 The relative moving speed in the direction in which the distance D between the open end 21b of 21 in the direction of the axis O increases, that is, the direction in which the pressing plate 22 retreats, is set to be higher than the pressing plate 22 and the open end 21b shown in FIG. When the interval D in the O direction is larger, the relative moving speed is smaller in the direction where the interval D becomes smaller as shown in FIG. 4.

Therefore, in this embodiment, after the processed objects deposited on the inner peripheral surface of the filter screen 21a are pressed, and the pressing plate 22 is retracted, the new processed objects supplied by the supply pipe 9 will gradually be processed over time. After the object is pressed, the accumulation becomes small, and a large amount of the processed object accumulates on the inner peripheral surface of the filter mesh 21a in a state where it is easy to filter. Therefore, a large amount of processed objects can be filtered efficiently. On the other hand, when the stacked processed objects are pressed, the pressing plate 22 advances and the distance D from the open end 21b becomes smaller, the moving speed increases, and the processed objects stacked on the stacked processed objects can be reduced. Therefore, a uniform filter cake can be formed including the full length of the basket 21.

Furthermore, as in the first and second embodiments, if the relative movement speed of the push plates 7, 22 to the baskets 2, 21 in the direction of the axis O is set It is: the relative moving speed in the direction in which the interval D increases in the direction of the axis O is smaller than the relative moving speed in the direction in which the interval D decreases. When the ratio is too large, the moving basket (inner basket 2) or the pressing plate 22 The setting of the movement speed will become difficult. Therefore, the processed materials that do become more cannot be supplied to the filters 2a, 21a in the easy-to-filter state, and many processed materials may be stacked on the filters 2a, 21a in the difficult-to-filter state.

Therefore, the relative moving speed in the direction in which the distance D between the push plates 7, 22 and the open ends 2b, 21b of the baskets 2, 21 in the direction of the axis O increases, should be set to be small, and it is preferable to set the relative moving speed in the direction where the distance D decreases. A speed above 1/4 of the relative movement speed. However, even if the difference in relative moving speed is small, it may become impossible to effectively achieve the above-mentioned effect. Therefore, it is more preferable to set the relative movement speed in the direction in which the interval D becomes larger to 2/3 or less of the relative movement speed in the direction in which the interval D becomes smaller. Furthermore, in the first embodiment, the present invention is applied to a two-stage basket provided with an outer basket 1 and an inner basket 2, and a centrifugal separation device and a centrifugal separation method are provided with a single basket 21 in the second embodiment. The situation is explained. However, it is of course possible to apply the present invention to a centrifugal separation device and a centrifugal separation method having baskets of more than three stages.

Industrial availability

According to the centrifugal separation device and the centrifugal separation method of the present invention, even if the basket is not increased in size and the size of the basket is increased, or the time of one stroke of advance and retreat is lengthened, it is possible to achieve efficient filtration of the processed material and increase the processing volume, and A uniform filter cake is formed. Therefore, it is possible to reduce the cost of the centrifugal separator device itself, or reduce the installation space of the device, and reduce the weight of the device. Simplification of the set-up basis achieved, and the post-processing of the filter cake can also be carried out stably and easily.

1‧‧‧Outer basket

1a‧‧‧Outer filter

1b‧‧‧Open end of outer basket 1

1c‧‧‧Retaining plate of outer basket

1d‧‧‧Support shaft

2‧‧‧Inner basket

2a‧‧‧Inner filter

2b‧‧‧Open end of inner basket 2

2c‧‧‧Holding plate

3‧‧‧Shell

3a‧‧‧Containing ring

3b‧‧‧Exhaust outlet

4‧‧‧Bearing

5‧‧‧Spindle

6‧‧‧Pushing shaft

7‧‧‧Pushing plate

8‧‧‧Dispersing plate

9‧‧‧Supply pipe for processed material

10‧‧‧Bearing Box

11‧‧‧Advance and retreat drive unit

11a‧‧‧Electric motor

11b‧‧‧Cylinder box

O‧‧‧Axis

Claims (6)

A centrifugal separation device is provided with: a basket in a cylindrical shape, a filter screen is arranged on the main body part and can be rotated around an axis; and a pressing plate is housed in the basket to be integrally rotatable, and is arranged so as to be relative to the basket Moving relatively in the axial direction, the centrifugal separation device is to filter the cake filtered from the processed material supplied into the basket by the filter, and press the cake toward the open end of the basket by the pressing plate And discharge, the relative moving speed of the pressing plate and the basket in the axial direction is set to be: the relative moving speed in the direction in which the distance between the pressing plate and the open end of the basket in the axial direction becomes larger than that of the previous The relative moving speed of the pressing plate and the open end of the basket in the direction in which the distance in the axial direction becomes smaller is also small. The centrifugal separation device of claim 1, wherein the relative moving speed in the direction in which the distance between the pressing plate and the open end of the basket in the axial direction becomes larger is set to be: to the open end of the pressing plate and the basket The relative movement speed in the direction in which the interval in the axis direction becomes smaller is 1/4 or more. For the centrifugal separation device of claim 1 or 2, wherein the relative moving speed in the direction in which the distance between the push plate and the open end of the basket in the axial direction becomes larger is set to be between the push plate and the basket The relative movement speed of the opening end in the direction in which the interval in the aforementioned axial direction becomes smaller is 2/3 or less. A centrifugal separation method is to feed the processed material into a cylindrical basket that is provided with a filter screen on the main body and rotates around the axis, and the filter cake filtered from the processed material through the aforementioned filter screen is compressed by pressing a plate. It is pressed and discharged to the open end side of the basket, and the pressing plate is housed in the basket to be integrally rotatable, and a pair of the baskets are relatively movable in the axial direction. The centrifugal separation method is The relative moving speed of the pressing plate and the basket in the axial direction is set to be: the relative moving speed in the direction in which the distance between the pressing plate and the open end of the basket in the axial direction becomes larger than that of the pressing plate The relative moving speed in the direction in which the distance from the open end of the basket in the axial direction becomes smaller is also small. For the centrifugal separation method of claim 4, the relative movement speed in the direction in which the distance between the pressing plate and the open end of the basket in the axial direction becomes larger is set to: to the open end of the pressing plate and the basket At least 1/4 of the relative movement speed in the direction in which the interval in the aforementioned axis direction becomes smaller. For the centrifugal separation method of claim 4 or claim 5, the relative movement speed in the direction in which the distance between the push plate and the open end of the basket in the axial direction becomes larger is set to: The opening end is less than 2/3 of the relative moving speed in the direction in which the interval in the aforementioned axial direction becomes smaller.

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