JP2005279731A - Screw press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw press for preventing a mud cake from adhering to a screen. <P>SOLUTION: The screw press is composed of a rotary drum 20, a screw shaft 13a passing through the axial center part of the drum, and a screw blade 13b winding at least part of the outer periphery of the screw shaft 13a. The screw press is provided with: a screw 13, which is rotatable to convey a material to be treated in the rotary drum 20; a pressor 30, which is disposed at an end part 29 of the discharging side of the rotary drum 20 and regulates the amount of a solid component discharged from a solid component discharging port 39; a 1st driving device 14, which applies controllable torque to the screw 13; and a 2nd driving device 22, which applies controllable torque to the rotary drum 20. The rotary drum 20 and the screw 13 are independently rotatably supported on the screw shaft 13a, as a common rotary shaft, through a pair of bearings consisting of a 3rd bearing 3 and a 4th bearing 4. The rotary drum 20 or the screw shaft 13a is pivotally supported on a base stand 5 through another pair of bearings. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a screw press that squeezes or condenses mud with a rotating drum having a screen having a filtration function on its peripheral surface and a screw that passes through the axial center of the rotating drum.

  Conventionally, there has been disclosed a rotary drum type screw press in which an inner cylinder screw is rotated and an outer cylinder screen is rotated at a slow speed of about 0.5 rotations per minute (for example, Patent Document 1). reference).

FIG. 5 shows a conventional screw press that has been invented by the applicant of the present application and has already been applied for a patent. As shown in FIG. 5, a rotating drum 42 provided in a casing 53 and having a concentration filtration hole (hereinafter referred to as “screen”) rotatably supported, and a workpiece to be processed in the rotating drum 42. And a screw shaft 43a as a compressing and conveying means for conveying in the direction. A screw shaft 43a of the screw 43 is supported by a bearing 60 in the vicinity of one end (left side in the figure), and the other end 42a (right side in the figure) ) Is supported by a bearing 61, and a sprocket 47 for rotating the screw 43 is fitted to one end thereof.
The rotary drum 42 is pivotally supported by a bearing 58 at one end (left side in the figure), and the other end (29) (right side in the figure) is pivotally supported by a drum roller 41. A sprocket 46 for rotating the rotary drum 42 is fitted to the part. The presser 45 includes a presser ring 45b provided facing the end 42a of the rotary drum 42, an angular ball bearing 44 that rotatably supports the presser ring 45b around the presser body 45c, and an outer periphery of the presser body 45c. And a spring 45a that applies back pressure to the opening 49 that is an outlet of the solid content of the object to be processed.

The workpiece supply pipe 48 is formed of a hollow portion formed on one end side (left in the drawing) of the screw shaft 43a, and has one opening so that the workpiece can be supplied to the concentration zone a in the rotary drum 42. 52 is disposed on the screw shaft 43a.
In the rotating drum 42, a concentration zone a, a filtration zone b, and a compression zone c are arranged in order from the entrance, and the pitch of the screw blades 43b is gradually clogged, so that the object to be processed is concentrated as it progresses. Is done.
A cleaning device 57 as a cleaning means is disposed on the outer side of the rotating drum 42 and is for cleaning the rotating drum 42 from the outside.

In this apparatus, the workpiece to be injected from the injection port 51 at the shaft end is injected into the rotary drum 42 through the opening 52 and gradually compressed and dehydrated while being conveyed by the screw 43 inside the rotary drum 42. It is separated into a solid and a separated liquid.
Then, the separated liquid is filtered by the screen 42 b of the rotary drum 42 and discharged from the discharge port 59. On the other hand, the drained solid content is discharged from the other opening 49 formed between the end 42a of the rotary drum 42 and the presser ring 45b.

JP 2003-136290 A (paragraphs [0006] to [0015] FIG. 1)

However, the conventional screw press has a problem in the concentric accuracy between the axis of the screw 43 and the axis of the rotary drum 42 for the following three reasons.
The first reason is that the screw 43 and the rotating drum 42 have long axial lengths, and the length in the longitudinal direction along the rotating shaft extends to several meters, so that the deflection cannot be ignored.
The second reason is that the screw 43 and the rotating drum 42 are supported at their one side ends by supporting means of different types of axial center accuracy, and their axial support positions are considerably in the axial direction. It is a cause of worsening the concentricity of the two due to the separation.
The third reason is because the end 42a on the discharge side of the rotary drum 42 is supported by the drum roller 41 which cannot be improved in the axial center accuracy in relation to the second reason.
The end 42a on the discharge side of the rotating drum 42 has an outer diameter of nearly 1 m, and is not easily rounded. In addition, it is close to an open state, and is in a state where dust protection and the like are incomplete and dust is likely to adhere to it. Since the drum roller 41 supports this outer peripheral surface, it is a factor that the concentric accuracy between the rotating drum 42 and the screw 43 cannot be within tens of μm.

Therefore, the clearance between the inner peripheral surface of the screen 42b that forms the peripheral surface of the rotating drum 42 and the screw outer periphery 43c has conventionally required a margin of about 1 mm as a mechanical accuracy clearance.
In addition, according to the respective deflections of the screen 42b and the screw 43, a gap that is not constant over time and in place is generated between the inner peripheral surface of the screen 42b and the screw outer periphery 43c.

For this reason, in the gap between the inner peripheral surface of the screen 42b and the outer periphery 43c of the screw, the waste of the object to be processed called “solidified residue”, “dehydrated residue”, “deposition” or “mud cake” (hereinafter referred to as “mud”). Cake)) forms a difficult-to-filter layer and sticks to reduce the filtration area, thus causing a problem of poor filtration.
In order to frequently remove this mud cake, when the operation is stopped and the treatment object staying on the rotating drum 42 is taken in and out and washed, if a large amount of washing water is used, then the washing waste water is not treated. Therefore, the amount of processing increases, resulting in a result that is contrary to the purpose of the dehydration processing, and operation efficiency is significantly reduced.

  Therefore, in the present invention, since a gap between the inner peripheral surface of the screen 42b and the outer periphery of the screw blade 13b has conventionally been required to some extent, a mud cake layer is formed, causing poor filtration. By adopting a structure that increases the axial accuracy of the rotating drum and the screw shaft so that the inner peripheral surface of the screen 42b and the screw blade 13b can be slidably matched, the gap is almost eliminated, It aims at providing the screw press which prevented formation of the layer of a mud cake and eliminated the poor filtration.

According to the first aspect of the present invention, there is provided a rotary drum 20 having a screen 20a having a filtration function formed on a peripheral surface thereof, a screw shaft 13a penetrating an axial center portion of the rotary drum 20, and at least a part of the screw shaft 13a. A screw blade 13b wound around the outer periphery of the screw, and is disposed at a rotatable screw 13 for transporting a workpiece in the rotary drum 20 and an end 29 on the discharge side in the rotary drum 20, A presser 30 that regulates a solid content discharge amount from the solid content discharge port 39, a first drive device 14 that applies a controllable rotational force to the screw 13, and a controllable rotational force to the rotary drum 20. A screw press 10 having a second drive device 22, wherein the rotary drum 20 and the screw 13 share the screw shaft 13 a. The rotary drum 20 or the screw shaft 13a is supported by a pair of bearings including a third bearing 3 and a fourth bearing 4 as a rotary shaft. The screw press 10 is supported by a base 5.
The range of the rotary drum 20 includes the limit to which the presser ring 30a can be most retracted.

According to the first aspect of the present invention, both ends of the screw shaft 13a or the rotary drum 20 are pivotally supported on the base 5 by the pair of bearings including the first bearing 1 and the second bearing 2, and the third bearing A screw shaft 13a and a rotary drum 20 are axially attached by a pair of bearings composed of a third bearing 4 and a fourth bearing 4, and the first bearing 1 to the fourth bearing 4 are along the axis of the screw shaft 13a.
Further, since the power of the first driving device 14 and the second driving device 22 is transmitted to the screw shaft 13a and the rotating drum 20, respectively, the screw 13 and the rotating drum 20 use the screw shaft 13a as a common rotating shaft. The screw 13 and the rotary drum 20 can be supported at both ends, respectively, and the axial center accuracy of both can be maintained. Moreover, the screw 13 and the rotary drum 20 can be rotated at different rotational speeds (differential rotation).

  In the second aspect of the present invention, the rotary drum hollow shaft 20b is formed by projecting the discharge-side end portion 29 of the rotary drum 20, and the fourth bearing 4 is fitted into one shaft end of the screw shaft 13a. The screw press (10) according to claim 1, wherein the rotary drum hollow shaft (20b) is fitted to the outer diameter of the fourth bearing (4).

  According to the second aspect of the present invention, the rotary drum hollow shaft 20b in which the end portion 29 on the discharge side of the rotary drum 20 protrudes from the outer diameter of the fourth bearing 4 fitted into one shaft end of the screw shaft 13a. Concentric accuracy can be maintained more reliably because it is mounted with a concentric double shaft structure.

  According to a third aspect of the present invention, the presser 30 includes a presser ring 30a that can rotate coaxially with the rotary drum 20, a presser rod 30b that transmits an operation of moving the presser ring 30a in the axial direction, and the rotary drum. The presser push plate 30c, which is disposed outside the presser rod 30b and interlocks with the presser rod 30b, is slidable in the rotational direction of the presser push plate 30c. A sliding joint 30d that can be transmitted to the outside of the body, and a position restricting means 30e that transmits the forward / backward movement to the presser ring 30a via the sliding joint 30d. Item 3. The screw press 10 according to Item 2.

According to the invention described in claim 3, the position regulating means 30e regulates the position of the presser pressing plate 30c via the sliding joint 30d, and the solid content is reduced by the presser rod 30b and the presser ring 30a connected to the presser pressing plate 30c. The opening amount of the discharge port 39 is regulated.
When the discharge pressure of the solid content of the workpiece increases in the screw press 10, the dehydrated solid content is discharged from the solid content discharge port 39 formed by the discharge-side end portion 29 of the rotary drum 20 and the pressering 30a. Is done. By adjusting the position restricting means 30e to restrict the opening amount of the solid content discharge port 39, it is possible to cope with the difference in the object to be processed.

  In the invention according to claim 4, the outer diameter d of the screw blade 13b and the inner diameter d 'of the rotary drum 20 are set so that the outer periphery of the screw blade 13b and the inner peripheral surface of the rotary drum 20 are in sliding contact with each other. The screw press 10 according to any one of claims 1 to 3, wherein the screw press 10 is provided.

According to the invention of claim 4, since the screw shaft 13a is rotatably attached to the rotary drum 20, the axis of the screw shaft 13a and the axis of the rotary drum 20 can be aligned.
That is, another rotating body is pivotally supported by one screw shaft 13a so as to freely rotate independently, so that the outer periphery of these screw blades 13b and the inner peripheral surface of the rotating drum 20 are The gap is extremely small, and the durability can be maintained even with considerable axle load. Accordingly, the outer periphery of the screw blade 13b of the screw 13 is substantially slidably matched with the inner peripheral surface of the rotary drum 20, and even if it is configured to always contact, there is no concern that the contact portion will be damaged. Since there is no room for the mud cake layer to adhere to the inner peripheral surface of the drum 20, that is, the screen 20a, clogging does not occur, and the cause of lowering the filtration efficiency is also eliminated.

  According to the first aspect of the present invention, both ends of the screw 13 and the rotary drum 20 can be supported, and the axial center accuracy of both can be maintained. In addition, the screw 13 and the rotating drum 20 can be differentially rotated.

  Specifically, since the screw 13 and the rotating drum 20 are coaxially supported at both ends by a bearing such as a ball bearing of the same type, the set clearance (assuming that the rolling surface or sliding surface inside the bearing is close to a mirror surface is assumed. (Radial gap) can be strictly defined and protected against dust, so concentric accuracy of several tens of μm can be easily maintained. Therefore, the outer periphery of the screw blade 13b and the inner diameter of the rotary drum 20 are matched so that there is an extremely small gap. It is possible to prevent the formation of a mud cake layer and eliminate poor filtration.

  According to the second aspect of the present invention, the rotary drum hollow shaft 20b having one end of the rotary drum 20 protruding from the outer diameter of the fourth bearing 4 fitted in the vicinity of one shaft end of the screw shaft 13a is a concentric double shaft. Since the shaft is attached to the structure, the concentric accuracy can be maintained more reliably.

  According to the invention described in claim 3, by adjusting the position regulating means 30e to regulate the opening amount of the solid content discharge port 39, it is possible to cope with the difference in the object to be processed.

  According to the fourth aspect of the present invention, it is possible to eliminate room for the mud cake to adhere to the screen 20a, so that the clogging does not occur and the cause of reducing the filtration efficiency is also eliminated.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Throughout the drawings, parts having the same effect are denoted by the same reference numerals, and redundant description is omitted.
FIG. 1 is a plan sectional view of a screw press 10 of the present invention. As shown in FIG. 1, a rotary drum 20 provided in a casing 31 and pivotally supported so that a screen 20 a having a filtering function is formed on a peripheral surface thereof, and an axial center portion of the rotary drum 20 are penetrated. A rotatable screw 13 composed of a screw shaft 13a and screw blades 13b is provided.

  Further, the screw shaft 13a of the screw 13 has a taper-shaped portion in which an outer peripheral portion is wound with a screw blade 13b that generates a propelling action in the axial direction in accordance with the shaft rotation and expands toward the discharge side, and both ends of the taper-shaped portion. And a rotation support shaft portion projecting from each. For convenience of the following description, the rotation support shaft portion located on the left side of FIG. 1 (that is, the supply side of the object to be processed) is referred to as a hollow shaft 13e, and the right side of FIG. The rotation support shaft portion positioned at is called a solid shaft 13d.

The vicinity of both ends of each of the screw shaft 13a and the rotary drum 20 is supported on the base 5 directly or indirectly by a pair of bearings including the first bearing 1 and the second bearing 2.
Further, the screw shaft 13 a and the rotary drum 20 are mounted by a pair of bearings including the third bearing 3 and the fourth bearing 4 in the vicinity of both ends.
The first drive device 14 that applies a controllable rotational force to the screw 13 and the second drive device 22 that applies a controllable rotational force to the rotary drum 20 are provided. The driving device 22 is configured to transmit driving force via driving force transmitting means disposed in the vicinity of each of the first bearing 1 and the second bearing 2.

In other words, the first bearing 1 and the third bearing 3 are provided side by side on one shaft end (processing object supply side) of the screw shaft 13a, and the other shaft end (solid content discharge side) of the screw shaft 13a. The second bearing 4 and the fourth bearing 4 are provided side by side, and the first bearing 4 to the fourth bearing 4 are provided along the axis of the screw shaft 13a.
Further, one end of the screw 13 and the rotating drum 20 can use the screw shaft 13a as a common rotating shaft, and can support both ends of the screw 13 and the rotating drum 20, respectively, so that the axial accuracy of both can be maintained. In addition, the screw 13 and the rotary drum 20 can be differentially rotated.
Further, the power of the first driving device 14 and the second driving device 22 is transmitted to the screw shaft 13a and the rotary drum 20 in the vicinity of any one of the first bearing 1 to the fourth bearing 4, respectively. It is effective in maintaining the axial accuracy.

  In addition, as described in claim 2, a rotary drum hollow shaft 20b is formed by projecting the discharge-side end portion 29 of the rotary drum 20, and a fourth bearing is provided on one shaft end side of the screw shaft 13a. 4 is fitted, and the rotary drum hollow shaft 20 b is fitted to the outer diameter of the fourth bearing 4. As a result, the screw shaft 13a and the rotary drum hollow shaft 20b are mounted in a concentric double shaft structure, so that the concentric accuracy can be more reliably maintained and the durability can be maintained even for a considerable shaft weight. It becomes possible.

  That is, the rotating drum 20 passes through the shaft center portion and rotates at a speed different from that of the screw 13 that is coaxially supported and rotated, and the outer diameter d of the screw blade 13 b and the inner diameter d ′ of the rotating drum 20. By making the dimensions substantially coincident with each other so as to be slidable, the gap between the sliding portions is reduced to the maximum, so that the sliding portions can smoothly contact even in a configuration in which they always contact.

  Moreover, since the room where the mud cake layer adheres to the inner peripheral surface of the rotating drum 20, that is, the screen 20a can be eliminated, clogging does not occur and the cause of reducing the filtration efficiency is also eliminated. In addition, the screw blade 13b and the rotating drum 20 are made to substantially coincide with each other so that the gap is set to 0.5 mm or less, preferably 0.1 mm or less.

  The presser 30 adjusts the opening degree of the solid content discharge port 39 formed by the rotary drum 20 and the screw 13. The presser 30 controls the discharge amount of the solid content discharged from the discharge window 36 through the solid content discharge port 39. A presser ring 30a for adjusting, a presser rod 30b for transmitting an operation of moving the presser ring 30a in the axial direction, a presser push plate 30c connected to and interlocked with a presser rod 30b coaxially rotatable with the rotary drum 20, and The sliding joint 30d is slidable with respect to the rotation direction of the presser pressing plate 30c and can transmit a thrust force for advancing and retreating to the outside of the rotary drum 20, and the thrust force is transmitted via the sliding joint 30d. It is comprised from the position control means 30e transmitted to the ring 30a.

  Further, as shown in FIG. 1, the presser ring 30a of the presser 30 is freely rotatable and slidable on the end portion 29 of the tapered portion that is expanded toward the discharge side by winding the screw blade 13b of the screw shaft 13a. It is also possible to adjust the degree of opening of the solid content discharge port 39 formed by the end portion 29 and the side surface of the tapered portion of the screw shaft 13a, as shown in FIG. The presser ring 30a may be configured to adjust the opening degree so as to face the solid content discharge port 39 formed by the discharge-side end portion 29 of the rotary drum 20 and the maximum end portion of the tapered portion of the screw shaft 13a. .

  In the configuration described later with reference to FIG. 4, the slide support member 21 having the same diameter as the maximum end of the tapered portion of the screw shaft 13 a ′, which allows the presser ring 30 a to smoothly slide, is rotated. It is preferable to project from the end portion 29 on the discharge side of the drum 20 ′.

  The presser 30 is energized with a pressing force that opposes the object to be processed that receives the discharge pressure of the screw 13 according to the property of the object to be processed and the purpose of the process, and is formed by the rotating drum 20 and the screw 13. The degree of opening of the minute discharge port 39 is adjusted, and the amount of solid content discharged from the discharge window 36 through the solid content discharge port 39 is adjusted. The solid content discharge port 39 is increased to narrow the solid content, making it difficult to discharge the solid content. On the other hand, when weak compression is sufficient, the solid content discharge port 39 is widened to facilitate the discharge of the solid content, and can be adjusted to a desired dehydration rate by passing through the rotary drum 20 in a short time. Thus, by adjusting the position regulating means 30e and regulating the opening amount of the solid content discharge port 39, it is possible to cope with the adjustment of the solid content dehydration rate and the difference in the object to be processed.

The screw press 10 includes a rotary drum 20 having a screen 20a having a filtration function on a peripheral surface, a screw shaft 13a that passes through an axial center of the rotary drum 20, and a screw shaft 13a wound around the workpiece. The screw 13 composed of the screw blades 13b whose pitch is narrowed toward the side, and the discharge-side end portion 29 in the rotary drum 20 exerts a pressing force on the workpiece that receives the discharge pressure of the screw 13. And an urged presser ring 30a.
The screw shaft 13a is rotatably attached to the rotary drum 20, and the outer diameter d of the screw blade 13b and the inner diameter d 'of the rotary drum 20 are substantially matched to be slidable.
In addition, regarding the symbols d and d 'respectively attached to the outer diameter d of the screw blade 13b and the inner diameter d' of the rotary drum 20, there is only a difference of several μm to several hundred μm in FIGS. Instead, only the symbol d is shown because they have substantially the same dimensions.

  Further, the peripheral surface of the rotary drum 20 constitutes a screen 20a. For example, a wedge wire having a triangular cross-sectional shape is formed in a ring shape, and a slight gap which is a filtration hole is provided between the rings. As such, it is a connected structure. In addition, the screen 20a is set with the mesh width sequentially from the entrance to the exit.

The screw 13 is applied by transmitting the rotational force from the sprocket 15 to the sprocket 17 via the chain 16 by the first drive device 14 including a controllable electric motor and the like and transmission means.
The rotary drum 20 is applied by transmitting the rotational force from the sprocket 23 to the sprocket 25 via the chain 24 by the second drive device 22 including a controllable electric motor and the like and transmission means.

  The pair of the first bearing 1 and the second bearing 2 and the pair of the third bearing 3 and the fourth bearing 4 have the shaft of the screw 13 as a base shaft, and each pair can be independently rotated. In particular, the relationship between the second bearing 2 and the fourth bearing 4 constitutes a concentric double bearing. That is, the rotary drum hollow shaft 20b is supported so as to cover a solid shaft 13d having a central axis in the vicinity of one end of the screw shaft 13a so as to cover the double shaft structure via the fourth bearing 4. .

  Thus, since the concentric double bearing which can be rotated independently is configured, shaft eccentricity and backlash can be reduced. Therefore, an appropriate sliding contact can be smoothly maintained between the outer diameter of the relatively moving screw 13 and the inner diameter of the rotary drum 20. Then, if the outer diameter of the screw 13 and the inner diameter of the rotary drum 20 are substantially matched, there is no room for the mud cake to be fixed, so the cause of lowering the filtration efficiency is also eliminated.

  In addition, an inverter motor control system is employed as a differential speed rotation control means for making a prescribed difference between the rotation of the rotary drum 20 and the rotation of the screw 13, and the rotation of the rotary drum 20 and the rotation of the screw 13 are adopted. If the frequency of the electric power supplied to each electric motor is controlled so as to give a specified difference, it can be easily realized, so detailed description will be omitted.

Here, the path of the workpiece will be described.
FIG. 2 is a longitudinal sectional view of the screw press 10 of the present invention. As shown in FIG. 2, a bracket 8 and a bracket 9 each provided with a bearing on the base 5 stand upright at a predetermined interval. The bracket 8 has a first bearing 1 and a bracket 9 has A second bearing 2 is provided, and a screw 13 and a rotary drum 20 are coaxially supported on the first bearing 1 and the second bearing 2.

  The conical portion of the screw shaft 13a does not necessarily have to be hollow, but the hollow shaft 13e is hollow, and the shaft end serves as an inlet 18 for injecting sludge / slurry, kneaded food, or the like that is the object to be processed, The object to be processed injected from the inlet 18 is supplied to the hollow shaft 13e via the rotary joint 11, and passes through the opening 19 opened near the inlet inside the rotary drum 20 via the hollow shaft 13e. And press-fitted into the rotary drum 20. A pipe (not shown) is connected to the rotary joint 11 and supplies non-processed material into the screw press 10.

An object to be processed inside the rotary drum 20 is solid-liquid separated by the screen 20a of the rotary drum 20 while being conveyed from the left to the right in the figure by the screw 13, and the separated separated liquid J is separated from the base 5 The liquid is discharged from the separation liquid discharge pipe 28 through a discharge port 24 provided from the center.
In addition, in the filtration chamber 100 formed between the rotating drum 20 and the screw shaft 13a, in addition to the gap between the screw shaft 13a and the rotating drum 20 becoming thicker due to the taper shape, the pitch of the screw blades 13b is reduced. Since it is configured so as to be gradually clogged, the volume of the filtration chamber 100 decreases as the object to be processed is transported and is dehydrated by pressing.

  As described above, the screw press 10 is provided in the casing 37 as a rotary drum 20 having a screen 20a rotatably supported, and compression transport means for transporting an object to be processed in the rotary drum 20 in the axial direction. The screw 13 and two openings formed respectively in the vicinity of the injection-side end portion and the discharge-side end portion 29 of the rotary drum 20, and the object to be processed injected from one injection port 18 has an opening portion. While being injected into the rotary drum 20 through 19 and being conveyed by the screw 13 inside the rotary drum 20, the solid content and the separated liquid are separated as the volume of the filtration chamber 100 decreases.

A presser 30 is connected to the end 29 of the rotary drum 20, and the presser 30 is pushed by the screw 13 and is urged by a pressing force that opposes the object to be processed that receives the discharge pressure. The opening degree of the solid content discharge port 39 formed by the screw 13 is adjusted.
As shown in FIG. 2, the object to be processed is conveyed from the inlet 18 in the order indicated by the arrow X, the arrow Y1, the arrow Y2 to the arrow Y12, and the arrow Z. In particular, when injected into the rotary drum 20 through the opening 19 (see FIG. 1), the solid content pushed out in the direction of the arrow Y12 counteracts the effect due to the volume reduction of the filtration chamber 100 and the workpiece to be subjected to the discharge pressure. The separation liquid J, which is discharged and restricted by the presser ring 30a biased by the pressing force and filtered from the screen 20a, passes through the separation liquid discharge port 24 in the funnel portion 27 to the single separation liquid discharge pipe 28. Liquid is collected and discharged out of the system. The pressering 30a is configured to be able to appropriately control the degree of opening of the solid content outlet 39 from fully closed to fully open by adjusting the expansion and contraction of the position restricting means 30e shown in detail in FIG.

  FIG. 3 is a cross-sectional view of a main part of the screw press 10 of the present invention, and FIG. 4 is a cross-sectional view of a main part of a screw press 10 ′ according to another embodiment of the present invention. The position of the presser ring 30a is urged by the position restricting means 30e shown in FIG. 1 to apply a pressing force against the object to be processed that receives the discharge pressure of the screw 13 according to the nature of the object to be processed and the purpose of the process. By adjusting the opening degree of the solid content discharge port 39 formed by the rotary drum 20 and the screw 13 (for example, moving from the position 7 to the position 6), the objects to be processed at the positions A to E conveyed by the screw 13 are processed. The material is compressed by the back pressure of the pressering 30a, separated into solid and liquid at positions A to D, the separated separated liquid J is discharged from the discharge port 24 through the funnel portion 27, and the solid content is pressed at the position E. It is squeezed to the maximum pressure by the pressing of 30a, and is discharged from the discharge pipe 12 as a dehydrated solid content through the solid content discharge port 39 and the discharge window 36 of the end portion 29.

  FIG. 4 is a cross-sectional view of a main part of a screw press according to another embodiment of the present invention. Only the differences from FIG. 3 are clarified, and the parts already described are denoted by the same reference numerals. Description is omitted.

  As shown in FIG. 4, the shape near the end 29 of the rotary drum 20 ′ and the shape of the screw shaft 13a ′ are different from those shown in FIG. First, in the screw shaft 13a ', parts other than the screw blades 13b are thinned to save material. Moreover, since the position of the 4th bearing 40 is arrange | positioned from the shaft center of screw shaft 13a 'in connection with that, a shaft mounting distance is shortened and the shaft center precision is improved.

Further, in the vicinity of the end 29 of the rotary drum 20 ′, the sliding support member 21 is disposed on the outer diameter including a concentric circle with the fourth bearing 40, and the presser ring 30a moves forward and backward (for example, from position 7 ′ to position 6). (Moving to ') is slidably supported, and the size of the discharge gap S is managed to cope with the difference in non-processed objects.
Note that the discharge pipe 12 'is relatively wide. And, in order to prevent splashing, a U-shaped discharge cover 38 is fixed to the base 5 'when viewed from the axial direction, but the embodiment shown in FIGS. The state is only illustrated and the internal structure is described, and actually, the same thing as the discharge cover 38 is provided.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be implemented with appropriate modifications. For example, a configuration in which all of the rotating shafts are set up vertically, or a configuration in which a large number of screw presses 10 each unit distinguished by the degree of concentration and squeezing according to the processing purpose may be connected.
In addition, the bearing structure is unified to either the structure of the combination of the first bearing 1 and the third bearing 3, or the structure of the combination of the second bearing 2 and the fourth bearings 4 and 40, and both shafts The ends may be configured symmetrically.
Further, the first bearing and the second bearing may have a structure for supporting the screw shafts 13a and 13a 'or a structure for supporting the rotary drums 20 and 20'.

It is a plane sectional view of the screw press of one embodiment of the present invention. It is a longitudinal cross-sectional view of the screw press of one embodiment of this invention. It is principal part sectional drawing of the screw press of one embodiment of this invention. It is principal part sectional drawing of the screw press of other embodiment of this invention. It is a longitudinal cross-sectional view of the conventional screw press.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st bearing 2 2nd bearing 3 3rd bearing 4,40 4th bearing 5 Base 6,6 ', 7,7' Position of pressering 8,9 Bracket 10 Screw press 11 Rotary joint 12,12 'Discharge pipe 13 screw 13a, 13a 'screw shaft 13b screw blade 13c screw outer periphery 13d solid shaft 13e hollow shaft 14 first drive device 15, 17, 23, 25 sprocket 16, 24 chain 18 inlet 19 opening 20, 20' rotating drum 20a Screen 20b Rotating drum hollow shaft 21 Sliding support member 22 Second drive device 24 Separating liquid outlet 27 Funnel part 28 Separating liquid outlet pipe 29 End part on the discharge side 30 Presser 30a Pressering 30b Presser rod 30c Presser pressing plate 30d Sliding Dynamic coupling 30e Position restriction means 31 Sing 36 discharging window 37 casing 38 outlet cover 39 solids outlet 41 drum roller 42 rotating drum 100 filtration chamber A~F treatment object J separated liquid S discharge gap

Claims (4)

A rotating drum (20) having a screen (20a) having a filtration function formed on the peripheral surface;
The rotary drum (20) includes a screw shaft (13a) that penetrates the shaft center portion and a screw blade (13b) that winds at least a part of the outer periphery of the screw shaft (13a), and the rotary drum (20 ) A rotatable screw (13) for conveying an object to be processed in
A presser (30) that is disposed at an end (29) on the discharge side in the rotary drum (20) and regulates a solid content discharge amount from a solid content discharge port (39);
A first drive device (14) for applying a controllable rotational force to the screw (13);
A screw press (10) comprising: a second drive device (22) for applying a controllable rotational force to the rotary drum (20);
The rotating drum (20) and the screw (13) are rotatable with each other via a pair of bearings including a third bearing (3) and a fourth bearing (4) with the screw shaft (13a) as a common rotating shaft. Is supported by the shaft,
The screw press (10), wherein the rotary drum (20) or the screw shaft (13a) is pivotally supported on a base (5) via another pair of bearings. A rotary drum hollow shaft (20b) is formed by projecting the discharge side end (29) of the rotary drum (20),
A fourth bearing (4) is fitted to one shaft end of the screw shaft (13a), and the rotary drum hollow shaft (20b) is fitted to the outer diameter of the fourth bearing (4). The screw press (10) according to claim 1. The presser (30)
A presser ring (30a) coaxially rotatable with the rotating drum (20);
A presser rod (30b) for transmitting an operation of moving the presser ring (30a) in the axial direction;
A presser pressing plate (30c) disposed outside the rotating drum (20) and connected to and interlocked with one end of the presser rod (30b);
A sliding joint (30d) that is slidable with respect to the rotation direction of the presser pressing plate (30c) and capable of transmitting the forward / backward movement to the outside of the rotating drum (20);
The screw according to claim 1 or 2, further comprising position restriction means (30e) for transmitting the advance / retreat operation to the presser ring (30a) via the sliding joint (30d). Press (10).   The outer diameter (d) of the screw blade (13b) and the inner diameter (d ′) of the rotating drum (20) so that the outer periphery of the screw blade (13b) and the inner peripheral surface of the rotating drum (20) are in sliding contact. The screw press (10) according to any one of claims 1 to 3, wherein:

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