JP2003205390A - Cleaning device for screw press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To fully clean the corner part, at the dead angle, between the inner circumferential end of a reinforcing plate and the outer circumferential face of a filter cylinder, in cleaning the filter cylinder of a screw press equipped with the reinforcing plate on the outer circumferential face of the filter cylinder. <P>SOLUTION: The cleaning device is equipped with a cleaning tube 24 surrounding the outer circumference of the filter cylinder 2 and with a transfer unit 25 for moving this cleaning tube 24 in the axial direction 9 of the filter cylinder 2. The cleaning tube 24 is provided with a plurality of injection nozzles 28a, 28b that injects cleaning water W to the outer circumferential face of the filter cylinder 2. Among these injection nozzles 28a, 28b, one group of injection nozzles 28a inclines forward in the moving direction of the cleaning tube 24, while the other 28b inclines backward, and the two groups of injection nozzles 28a, 28b are in a staggered arrangement with each other. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw press cleaning apparatus used for dewatering organic sludge such as sewage sludge and industrial wastewater sludge.

[0002]

2. Description of the Related Art Conventionally, as a cleaning device for a screw press as described above, for example, there is one described in Japanese Utility Model Laid-Open No. 61-127893. That is, an annular nozzle tube and a moving device for moving the nozzle tube in the axial direction (front-back direction) of the filtration tube are provided around the outer periphery of the filtration tube having the screw blades. The nozzle tube is provided with a plurality of cleaning nozzles for spraying cleaning water onto the outer peripheral surface of the filter cylinder. As shown in FIG. 10, each of the cleaning nozzles 50 is oriented in a direction orthogonal to the axis 55 of the filter cylinder 51.

According to this method, while the nozzle tube is moved in the axial direction of the filter cylinder by the moving device, the cleaning water is sprayed from each cleaning nozzle to clean the outer peripheral surface of the filter cylinder from the front end to the rear end. Water is sprayed and the filter cylinder is washed. As a result, the solid matter attached to the outer peripheral surface of the filter cylinder is removed, and the clogging of the filter cylinder is eliminated.

Since the sludge and the like in the filter cylinder are squeezed by the rotation of the screw blades and dehydrated, the internal pressure of the filter cylinder rises. On the other hand, in order to secure the strength of the filter cylinder, as shown in FIG.
There is one in which a plurality of annular reinforcing plates 52 are provided along the circumferential direction.

[0005]

However, in the above-mentioned conventional type, as shown in FIG. 10, when the nozzle tube 53 passes the outside of the reinforcing plate 52, the inner peripheral end portion of the reinforcing plate 52 and the filter tube are not formed. There is a problem that the corner portion with the outer peripheral surface of 51 becomes a blind spot A, the cleaning water 54 is not sufficiently sprayed to the blind spot A portion, and the cleaning effect of the filter cylinder 51 is reduced in the blind spot A portion. there were.

[0006] It is an object of the present invention to provide a screw press cleaning device capable of sufficiently cleaning the blind spot of the corner portion between the inner peripheral end of the reinforcing plate and the outer peripheral surface of the filter cylinder.

[0007]

In order to solve the above-mentioned problems, a cleaning device for a screw press according to the present invention as set forth in claim 1 filters a rotatable screw device for squeezing while feeding and moving an object to be squeezed. Provided in the cylinder, on the outer peripheral surface of the filtration cylinder, a screw press cleaning device provided with a reinforcing plate annularly formed along the circumferential direction, a cleaning pipe surrounding the outer peripheral side of the filtration cylinder, A moving device for moving the cleaning pipe in the axial direction of the filtration cylinder is provided, a supply pipe for supplying the cleaning fluid to the cleaning pipe is connected, and the cleaning pipe is supplied with the cleaning liquid supplied from the supply pipe. A plurality of jet nozzles for jetting the working fluid to the outer peripheral surface of the filtration cylinder are provided, and the plurality of jet nozzles are inclined toward the front in the moving direction of the cleaning pipe and inclined toward the rear. Characterized by consisting of

[0008] According to this, while the cleaning pipe is moved in the axial direction of the filter cylinder by the moving device, the cleaning fluid is sprayed from the respective spray nozzles, so that the front and rear end portions of the outer peripheral surface of the filter cylinder to the other end portion. The cleaning fluid is sprayed over the area to clean the filter cylinder. As a result, the solid matter attached to the outer peripheral surface of the filter cylinder is removed, and the clogging of the filter cylinder is eliminated.

During the above-described cleaning, the cleaning fluid is sufficiently jetted from the oblique front or the oblique rear with respect to the blind spot at the corner between the inner peripheral end of the reinforcing plate and the outer peripheral surface of the filter cylinder. The cleaning effect of the filter cylinder in the blind spot portion is improved.

According to a second aspect of the present invention, there is provided a screw press cleaning device of the present invention, wherein a plurality of injection nozzles inclined toward the front in the moving direction of the cleaning pipe are used as one injection nozzle, and a plurality of injection nozzles inclined toward the rear. The injection nozzle of the other as the other injection nozzle, the position of the other injection nozzle is shifted in the circumferential direction of the cleaning pipe with respect to the position of the one injection nozzle, and the one injection nozzle and the other injection nozzle are staggered. It is characterized by being arranged.

According to this, when the cleaning pipe is moved in the axial direction of the filter cylinder, the movement locus of the other injection nozzle passes between the movement loci of one of the injection nozzles, so that the cleaning between one of the injection nozzles is performed. Sufficiently done by the other injection nozzle. As a result, it is possible to prevent a decrease in the cleaning effect of the filter cylinder between the one injection nozzle or between the other injection nozzles, and it is possible to uniformly and surely clean the filter cylinder.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
~ It demonstrates based on FIG. As shown in FIG. 1, 1 is a screw press that squeezes and dehydrates sludge (an example of an object to be squeezed), and has the following structure.

That is, a rotatable screw device 3 for squeezing the sludge while feeding and moving the sludge is provided inside the horizontally arranged cylindrical filter cylinder 2. The filter cylinder 2 is composed of a thin filter medium 4 made of punching metal or the like, and a protective cylinder 5 having a hole larger than the hole of the filter medium 4 and protecting the outside of the filter medium 4. The front end of the filter tube 2 is supported and closed by the front support member 19, and the rear end thereof is the rear support member 20.
Supported by.

The screw device 3 is composed of a screw shaft 7 rotated by a rotary drive device such as a motor 6 and screw blades 8 spirally wound around the outer periphery of the screw shaft 7. The screw shaft 7 is inserted concentrically in the filter cylinder 2, and the shaft center of the screw shaft 7 coincides with the shaft center 9 of the filter cylinder 2.

The front end of the screw shaft 7 has a bearing 21.
And is passed through the front support member 19. A supply pipe 11 for supplying sludge into the filtration cylinder 2 is connected to the front end of the screw shaft 7 via a joint (not shown). A supply port 12 is formed in the front portion of the screw shaft 7 so as to open to the outer peripheral surface of the screw shaft 7 and communicate with the inside of the supply pipe 11. Further, a discharge port 13 for discharging sludge from the inside of the filtration cylinder 2 is formed at the rear end of the filtration cylinder 2. Further, the screw shaft 7 is formed in a tapered shape in which the supply side (front side) has a small diameter and the discharge side (rear side) has a large diameter.

Behind the outlet 13, the outlet 1
3, there is provided a back pressure plate device 14 which acts as a back pressure a pressure in a direction opposite to the sludge feeding direction.
The back pressure plate device 14 includes an annular back pressure plate 15 having a tapered surface facing the discharge port 13, and a pneumatic cylinder device 16 that presses the back pressure plate 15 toward the discharge port 13. The rear end of the screw shaft 7 penetrates the central opening of the back pressure plate 15.

On the outer peripheral surface of the protective cylinder 5 of the filter cylinder 2, a plurality of reinforcing plates 17a, 1 formed in an annular shape along the circumferential direction.
7b and 17c are externally fitted and integrally attached. Among them, the reinforcing plate 17a is located at the front end (supply side end) of the filtration cylinder 2, the reinforcing plate 17b is located at the rear end (discharging side end) of the filtration cylinder 2, and the reinforcing plate 17c is located above the front. Reinforcing plate 1
It is located between 7a and the rear reinforcing plate 17b.

As shown in FIGS. 1 and 2, the screw press 1 is provided with a cleaning device 23 for cleaning the filter cylinder 2. The cleaning device 23 includes an annular cleaning pipe 24 that surrounds the outer periphery of the filtration cylinder 2, and a moving device 2 that moves the cleaning pipe 24 in the axial direction 9 (front-back direction) of the filtration cylinder 2.
5 and are configured as follows.

That is, the cleaning pipe 24 is formed in an annular shape by joining one half-split pipe 24a and the other half-split pipe 24b, which are formed in a hollow semi-circular shape, through the flange 26. It was done. The half tube 24
Each of a and 24b has cleaning water (an example of cleaning fluid).
The flexible supply pipes 27a and 27b (rubber tubes or the like) for supplying are connected.

The supply pipe 2 is provided on the inner peripheral portion of the cleaning pipe 24.
A plurality of jet nozzles 28a, 28b for jetting the wash water supplied from 7a, 27b to the outer peripheral surface of the filter cylinder 2 are provided. Of these, as shown in FIG. 4A, one injection nozzle 28 a is provided in plural, and the cleaning pipe 24 a
Inclining forward by a predetermined angle α (that is, inclining forward by a predetermined angle α with respect to a plane S orthogonal to the axis 9 of the filter cylinder 2). In addition, FIG.
As shown in FIG. 7, the other injection nozzle 28 b is provided in plural, and is inclined rearward in the moving direction of the cleaning pipe 24 by a predetermined angle α (that is, a surface orthogonal to the axis 9 of the filtration cylinder 2). It is inclined rearward with respect to S by a predetermined angle α).

Further, as shown in FIG. 5, with respect to the position of each one of the jet nozzles 28a, the other jet nozzle 28 is provided.
The position of b is shifted in the circumferential direction B of the cleaning pipe 24, and one jet nozzle 28a and the other jet nozzle 28b are arranged in a staggered pattern. As shown in FIG. 6A, fan-shaped injection holes 29 are formed in the injection nozzles 28 a and 28 b, respectively, the tip of which is enlarged toward the tip in the circumferential direction B of the cleaning pipe 24. Further, as shown in FIG. 6B, each injection hole 29 has a predetermined angle β in the front-rear direction (that is, the moving direction of the cleaning pipe 24) with respect to the central axis 30 in the circumferential direction B of the cleaning pipe 24. It is inclined.

Further, as shown in FIGS. 1 and 2, the moving device 25 has a plurality of traveling wheels 32 (may be rollers or the like).
And a pair of travel rails 34 provided between the front support member 19 and the rear support member 20, and the mobile body 33 in the axial direction 9 (front-back direction) of the filtration cylinder 2. And a driving device 35 for driving. The upper portion of the cleaning pipe 24 is integrally attached to the lower portion of the moving body 33. The drive device 35 includes a ball screw 36 arranged in parallel above the traveling rail 34, a motor 37 for rotationally driving the ball screw 36, and a screw provided on the moving body 33 and screwed on the ball screw 36. Nut body 38 to fit
It consists of and. Both front and rear ends of the ball screw 36 are supported by the front support member 19 and the rear support member 20 via bearings 39. The motor 37 is installed on the rear support member 20 and is connected to the rear end of the ball screw 36.

According to this, since the motor 37 rotates forward and the ball screw 36 rotates forward, the nut body 38 is sent from the rear side (discharging side) to the front side (supplying side). As shown, the moving body 33 travels forward, and the cleaning pipe 24 moves forward along the axis 9 together with the moving body 33. On the contrary, since the motor 37 rotates in the reverse direction and the ball screw 36 rotates in the reverse direction, the nut body 38 is sent from the front side to the rear side, so that the moving body 33 travels in the backward direction and the cleaning pipe 24 together with the moving body 33. Moves rearward along the axis 9.

Further, as shown in FIG. 1, the front support member 1
9 is provided with a front detecting device 40 (a limit switch or the like) for detecting that the moving body 33 has reached the forward moving limit position C, and the rear supporting member 20 has the moving body 33 at the backward moving limit position. Rear detecting device 41 for detecting that D has been reached
(Limit switch etc.) is provided.

The operation of the above structure will be described below.
As shown in FIG. 1, the sludge supplied from the supply port 12 into the filtration cylinder 2 through the supply pipe 11 is squeezed while being sent to the discharge port 13 side by the screw blades 8 rotating integrally with the screw shaft 7. Becomes a dehydrated cake, and presses the back pressure plate 15 and the back pressure plate 15 and the discharge port 13 (the rear end portion of the filtration cylinder 2).
It is discharged from the gap formed between and.

When the dehydration as described above is continued, solid matter adheres to the outer peripheral surface of the filter cylinder 2 and the filter cylinder 2 is clogged to lower the dehydration efficiency. 2. Wash 2.

That is, the cleaning water W is supplied to the supply pipes 27a, 27.
By supplying the cleaning water W from b to the cleaning pipe 24, the cleaning water W is sprayed from the spray nozzles 28a and 28b toward the outer peripheral surface of the filter cylinder 2. In this state, by rotating the motor 37 in the forward direction, the cleaning pipe 24 moves forward along the axis 9 together with the moving body 33, and when the moving body 33 reaches the forward movement limit position C, the front portion The detection device 40 of the moving body 3
3 is detected and switched from off to on, and based on this,
The motor 37 rotates in the reverse direction, and the cleaning pipe 24 moves rearward along the axis 9 together with the moving body 33. When the moving body 33 reaches the rearward movement limit position D, the rear detection device 41 detects the moving body 33 and switches from OFF to ON, and based on this, the motor 37 rotates forward, The cleaning pipe 24 moves forward along the axis 9 together with the moving body 33.

As the moving body 33 reciprocates between the forward movement limit position C and the backward movement limit position D as described above, the washing pipe 24 jets the washing water W from the jet nozzles 28a, 28b. However, it reciprocates in the front-rear direction along the axis 9 between the front end and the rear end of the filter tube 2. As a result, the cleaning water W is sprayed from the front end portion to the rear end portion of the outer peripheral surface of the filtration cylinder 2 to wash the filtration cylinder 2, so that the solid matter attached to the outer peripheral surface of the filtration cylinder 2 is removed, The second clogging is eliminated.

At the time of cleaning as described above, as shown in FIG. 7, each of the injection nozzles 28a and 28b is connected to the cleaning pipe 2 respectively.
Since it is inclined forward and backward in the moving direction of 4 by a predetermined angle α, with respect to the dead angle A of the corner portion between the inner peripheral end of the reinforcing plate 17c at the intermediate portion and the outer peripheral surface of the filter cylinder 2,
As shown by the solid line in FIG. 7, the cleaning water W jetted from one jet nozzle 28a is sufficiently jetted from diagonally behind the intermediate reinforcing plate 17c, and the other jet is shown as shown by the phantom line in FIG. Since the cleaning water W sprayed from the nozzle 28b is sufficiently sprayed from diagonally forward of the reinforcing plate 17c in the middle part, the cleaning effect of the filter cylinder 2 in the blind spot A portion is improved.

Further, as shown in FIG. 8A, when the moving body 33 reaches the forward movement limit position C, the inner peripheral end of the reinforcing plate 17a at the front end and the outer peripheral surface of the filter tube 2 are separated. The cleaning water W sprayed from one of the spray nozzles 28a is sufficiently sprayed from the oblique rear of the reinforcing plate 17a at the front end with respect to the blind spot A at the corner portion, so that the filter cylinder 2 is cleaned at the blind spot A portion. The effect is improved.

Further, as shown in FIG. 8B, when the moving body 33 reaches the rearward movement limit position D, the inner peripheral end portion of the reinforcing plate 17b at the rear end portion and the outer peripheral surface of the filter tube 2 are Since the cleaning water W jetted from the other jet nozzle 28b is sufficiently jetted obliquely in front of the reinforcing plate 17b at the rear end with respect to the blind spot A at the corner portion of the filter cylinder 2 at the blind spot A portion. The cleaning effect of is improved.

Further, as shown in FIG. 5, since one jet nozzle 28a and the other jet nozzle 28b are arranged in a zigzag pattern, when the cleaning pipe 24 is moved in the direction of the axis 9, Since the movement locus of each of the other ejection nozzles 28b passes between the movement loci of the respective ejection nozzles 28a, the cleaning between the one ejection nozzles 28a is sufficiently performed by the other ejection nozzle 28b. As a result, one of the injection nozzles 28a
It is possible to prevent a decrease in the cleaning effect of the filter cylinder 2 between the two or the other injection nozzles 28b, and it is possible to clean the filter cylinder 2 uniformly and reliably.

Further, as shown in FIG. 6, since the jet holes 29 of the jet nozzles 28a, 28b are formed in a fan shape, as shown in FIG. From 28b, it is injected into the fan-shaped injection range 43 which spreads in the circumferential direction B of the cleaning pipe 24. At this time, the circumferential direction B of the cleaning water W jetted from one jet nozzle 28a
And the end portion of the cleaning water W sprayed from the adjacent one of the spray nozzles 28a in the circumferential direction B overlap each other (overlap).

That is, as shown in FIGS. 5 and 9, the end of the injection range 43 corresponding to the one injection nozzle 28a and the end of the injection range 43 corresponding to the one adjacent injection nozzle 28a. Are overlapped at the overlapping portion E. Here, since each injection hole 29 is inclined by a predetermined angle β in the front-rear direction with respect to the central axis 30 of the cleaning pipe 24 in the circumferential direction B (see FIG. 6B), the cleaning pipe 24 has The injection ranges 43 that are adjacent to each other in the circumferential direction B are shifted in the front-rear direction (the direction of the axis 9) and separated without intersecting each other. As a result, the end portion of the cleaning water W sprayed from one of the spray nozzles 28a in the circumferential direction B and the circumferential direction B of the cleaning water W sprayed from one of the adjacent spray nozzles 28a.
The ends of the do not collide with each other. Therefore, it is possible to prevent a problem in which the ends of the cleaning water W sprayed from one of the spray nozzles 28 a adjacent to each other in the circumferential direction B collide with each other and the momentum of the spray declines. Similarly, an end portion of the cleaning water W jetted from the other jet nozzle 28b in the circumferential direction B and an end portion of the wash water W jetted from the other jet nozzle 28b adjacent thereto in the circumferential direction B are formed. They don't hit each other. Therefore,
It is also possible to prevent a problem that the ends of the cleaning water W jetted from the other jet nozzles 28b adjacent to each other in the circumferential direction B collide with each other and the jetting force is weakened. Thereby, the cleaning effect of the filter cylinder 2 is further improved.

In the above embodiment, the motor 37 is used.
Is set in advance by a timer (not shown) or the like, and the motor 37 is operated at regular intervals for the operation time set by the timer so that the cleaning pipe 24 moves to perform cleaning. Is configured. Alternatively, a changeover switch (not shown) for operating and stopping the motor 37 is provided, and the operator turns on the changeover switch to operate the motor 37 at a proper time to sufficiently wash the filter cylinder 2, and then the operator Alternatively, the motor 37 may be stopped by turning off the changeover switch. Further, the filter cylinder 2 may be washed by operating the motor 37 during the operation of the screw press 1.

In the above embodiment, as shown in FIG.
The cleaning pipe 24 has a two-divided structure including the half pipes 24a and 24b, but may be divided into three or more, or
It does not have to be a divided structure.

In the above-mentioned embodiment, the cleaning pipe 24 is formed in an annular shape, but it may be formed in a polygonal annular shape.
In the above embodiment, as shown in FIG.
Although the moving body 33 is moved using the motor 6, the motor 37 and the nut body 38, the moving body 33 may be moved using a cylinder device as another form of the drive device 35. Alternatively, the moving body 33 may be moved by winding a chain between a pair of front and rear sprockets, connecting the chain to the moving body 33, and rotationally driving the sprocket with a motor or the like.

In the above-mentioned embodiment, sludge was mentioned as an example of the object to be squeezed, but it is not limited to sludge. Further, although the cleaning water W is used as an example of the cleaning fluid, a liquid other than water or a gas such as air may be used.

[0039]

As described above, according to the present invention, while the cleaning pipe is moved in the axial direction of the filter cylinder by the moving device, the cleaning fluid is ejected from each of the injection nozzles, so that the outer periphery of the filter cylinder is ejected. The cleaning fluid is sprayed from one front end to the other end of the surface to clean the filter cylinder. At the time of such cleaning, since the cleaning fluid is sufficiently jetted from diagonally forward or diagonally rearward with respect to the blind spot of the corner portion between the inner peripheral end of the reinforcing plate and the outer peripheral surface of the filter cylinder, The cleaning effect of the filter cylinder in the part is improved, and sufficient cleaning can be performed.

[Brief description of drawings]

FIG. 1 is a side view of a screw press provided with a cleaning device according to an embodiment of the present invention.

FIG. 2 is a view on arrow XX in FIG.

FIG. 3 is a partially enlarged perspective view of a cleaning pipe of the screw press cleaning device.

FIG. 4 (a) is a view on arrow XX in FIG.
(B) is a YY arrow line view in FIG.

FIG. 5 is a schematic diagram showing a positional relationship of injection nozzles of the screw press cleaning device.

FIG. 6 (a) is a partially enlarged cross-sectional view taken along a circumferential axis of a cleaning pipe of a screw press cleaning device,
(B) is a XX arrow line view in the above (a).

FIG. 7 is a view of cleaning the periphery of the reinforcing plate in the middle part of the filter cylinder using the cleaning device of the screw press.

FIG. 8A is a diagram in which the periphery of the reinforcing plate at the front end of the filter cylinder is cleaned using a screw press cleaning device, and FIG. 8B is the periphery of the reinforcing plate at the rear end of the filter cylinder. FIG.

FIG. 9 is a partially enlarged front view of the washing pipe of the screw press washing device, showing a state in which washing water is being jetted from the jet nozzle to the filter cylinder.

FIG. 10 is a diagram in which the periphery of the reinforcing plate of the filter cylinder is cleaned using a conventional screw press cleaning device.

[Explanation of symbols]

1 screw press 2 Filter cylinder 3 screw device 9 axes 17a to 17c Reinforcing plate 23 Cleaning device 24 Cleaning Tube 25 moving devices 27a, 27b Supply pipe 28a, 28b injection nozzle B circumferential direction W Cleaning water (cleaning fluid)

Claims (2)

[Claims] 1. A rotatable screw device for squeezing while pressing and moving an object to be squeezed is provided inside a filtration cylinder, and a reinforcing plate formed in an annular shape along a circumferential direction is provided on an outer peripheral surface of the filtration cylinder. A cleaning device for a screw press, wherein a cleaning pipe surrounding the outer periphery of the filter cylinder and a moving device for moving the cleaning pipe in the axial direction of the filter cylinder are provided, and the cleaning fluid is supplied to the cleaning pipe. A supply pipe for supplying the cleaning fluid is connected to the cleaning pipe, and the cleaning pipe is provided with a plurality of injection nozzles for injecting the cleaning fluid supplied from the supply pipe to the outer peripheral surface of the filter cylinder. A cleaning device for a screw press, characterized in that it comprises one inclined toward the front in the moving direction of the pipe and one inclined toward the rear. 2. A plurality of jet nozzles inclined toward the front in the moving direction of the cleaning pipe are one jet nozzle, and a plurality of jet nozzles inclined toward the rear are the other jet nozzles, and the above one jet is performed. 2. The screw press according to claim 1, wherein the position of the other injection nozzle is displaced with respect to the position of the nozzle in the circumferential direction of the cleaning pipe, and the one injection nozzle and the other injection nozzle are arranged in a staggered manner. Cleaning equipment.