JPS61235099A - Screw press dehydrater provided with plural sets of cake cutters - Google Patents

Abstract

PURPOSE:To obtain the titled dehydrater for executing uniformly and efficiently a dehydrating treatment of an object to be treated, extending over the whole periphery of a screw cylinder, by making a screw for extruding the object to be treated, in the axial direction penetrate holes of many fixed plates and slide plates which is placed alternately, so that the slide plate is slid in the direction vertical to the shaft of the screw. CONSTITUTION:An object to be treated (cake) which is thrown in 5 by rotating a screw 3 is pressed by a blade of the screw 3, and fed into a cake cutter 30. Subsequently, the cake is dehydrated by sliding the slide plates 10a, 10b running along a fixed plate 9 and giving repeatedly bulge and push-back actions, the cake which is dehydrated partially by the cake cutter 30 is fed to the next cutter 40, and in a state that the phase is displaced by 120 deg., the cake is fed continuously to a cake cutter 50 by the same action as the foregoing. By this cutter, the cake is dehydrated in the same way, converted to a solid shape and fed to a discharge port 6, and further compressed and dehydrated by an advance force by a rotation of the screw 3, and a pressing force of a spring 7. Next, the dehydrated cake is pressed by an advance force of the screw 3, a slide boss 8 is moved backward against the spring 7, the discharge port 6 is pushed and opened, and the solid portion is discharged.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a screw screw suitable for use in dewatering sewage sludge, various industrial wastewater sludge, etc., or solid-liquid separation in the manufacturing process of various products. This relates to a press dehydrator.

[Conventional technology] Conventionally, in a dewatering machine using a screw conveyor and a screw tube, a fixed plate and a sliding plate having circular holes of the same diameter are placed near the discharge port of the screw tube, and the screw is passed through the hole. Place a large number of them alternately.

A device in which the sliding plate is tilted back and forth while keeping the centers of the circular holes in the fixed plate and the sliding plate coincident is known (Special Publication No. 5815/1983)6. In order to prevent the gap between the fixed plate for discharging water and the sliding plate from clogging, the sliding plate is simply tilted back and forth, and the dewatering efficiency is low.

On the other hand, a pulsating multi-plate juicer equipped with a cake cutter has a fixed plate with a circular hole near the outlet of the screw cylinder,
A large number of sliding plates each having an oval hole whose both ends are formed by an arc of the same diameter as the circular hole of the fixing plate are arranged alternately with screws passing through the holes, and the ends of the oval hole of the sliding plate are It is known that a sliding plate is slid back and forth in the long direction of the oblong hole between the positions where the circular arc of the part and the circular arc of the fixed plate hole overlap (Japanese Patent Publication No. 55-158).

According to the above-mentioned pulsating multi-plate juicer equipped with a cake cutter,
The idea was to increase the squeezing force during the squeezing process and improve the dewatering efficiency by applying pulsation to the processed material, which is being sequentially subjected to squeezing force in the screw cylinder, but the reciprocating sliding of the sliding plate Since the material to be treated is intermittently expanded and pushed back vertically or horizontally, the cake pulsates violently, resulting in severe leakage of solids from the gap between the fixed plate and the sliding plate. there were. Furthermore, there is a drawback that the impact caused by the rapid pulsation of the object to be treated shortens the useful life of the apparatus. Furthermore, since the object to be processed expands and is pushed back only in one direction, up and down or left and right, the object is deep. Since the moisture in the water is not uniformly transferred to the surface, there is a drawback that the dehydration efficiency is insufficient.

Furthermore, a conventional screw press dehydrator equipped with another cake cutter has a large number of fixed plates and sliding plates with holes arranged alternately near the discharge port of the screw tube, with screws passing through the holes. The hole diameter of the sliding plate is larger than the hole diameter of the fixed plate, and the sliding plate is rotated around the center of the circular hole of the fixed plate so that the outer circumference of the circular hole of the sliding plate is always in contact with the outer circumference of the circular hole of the fixed plate. A circular motion is applied to the sliding plate so that the center of the circular hole draws a circle with a constant diameter, and the direction of expansion and pushback of the processed material within the large diameter circular hole of the sliding plate is set in the direction of the entire circumference of the screw cylinder. (Tokuko Showa 51m-20
438).

According to the above-mentioned screw press dewatering machine equipped with a cake cutter, the material to be processed is expanded and pushed back continuously over the entire circumference, so the pulsation of the material to be processed and the impact on the device are reduced. Since the sliding direction is constant, there are disadvantages such as swelling of the processed material due to orientation in this direction, pulsation of the processed material due to uneven pushing back, and impact on the device, and also uneven dehydration of the processed material. There was a drawback.

[Problems to be Solved by the Invention] The present invention attempts to solve the above-mentioned drawbacks, and its purpose is to uniformly and repeatedly bulge and push back the object to be treated over the entire circumference of the screw cylinder, and to To provide a screw press dehydrator equipped with a plurality of sets of cake cutters suitable for eliminating pulsation of the processed material, extending the life of the device, and increasing dewatering efficiency.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a system in which screws for extruding the processed material in the axial direction are passed through holes in a fixed plate and a sliding plate that are alternately arranged in large numbers. Then, while the sliding plate is slid in a direction perpendicular to one axis of the screw, the combination body that dehydrates the processed material from the gap between the fixed plate and the sliding plate is moved a little along the axis of the screw cylinder. Two or more sets of each of the combinations were arranged in parallel, and the sliding period of the sliding plate for each combination was shifted in phase. The means for this purpose is a screw press dehydrator equipped with multiple sets of cake cutters.

[Example] An embodiment of the present invention will be described below based on the drawings.

In this embodiment, three sets of combinations of fixed plates and sliding plates (referred to as cake cutters) arranged in large numbers alternately are arranged in parallel in the axial direction of the screw cylinder, and the three sets of cake cutters are arranged on the cylinder at an angle of 120 degrees. They are arranged with a phase shift.

As shown in FIG. 1, a screw 3 is supported within the screw cylinder 1 and is rotationally driven by a drive motor 4a. The shaft of the screw 3 gradually becomes thicker toward the front in the direction of movement of the object to be processed, and a stepped portion 3' is formed on the front end side. An input port 5 for a material to be processed containing solids (referred to as a cake) is opened at one end of the screw cylinder l, and a sliding cylinder 8, which is constantly pressed by a spring 7, is provided at the other end. The screw 3 is inserted and engaged so as to close the stepped portion 3' of the screw 3. The dehydrated material to be processed pushes the sliding tube 8 against the spring 7 and is discharged from the discharge port 6. Note that 1' is an intermediate screw cylinder having a window 2 through which free water in the object to be treated is discharged.

As described above, three sets of cake cutters 30, 40 and 50 are arranged side by side near the discharge port 6 of the screw cylinder l.

Since the cake cutters 30, 40, and 50 are formed in substantially the same shape, the structure thereof will be briefly explained using the cake cutter 30.

As shown in FIGS. 2 and 3, a large number of fixed plates 9 having one circular hole 11 and a large number of sliding plates 10b having one circular hole 12 are arranged alternately, and on both sides there are circular holes 12 and cam holes. A sliding plate 10a having a diameter of 1B is provided.

A bracket 14 fixed to the screw tube l is disposed on the outside of each sliding plate 10a to support a rotating shaft 18. The fixed plate 9 is fixed to the bracket 14 by support shafts 13 passing through its four corners, and the parts of the sliding plates 10a and tob that protrude from the fixed plate 9 are integrally connected by a connecting shaft I5. A cam 17 eccentrically fixed to a rotating shaft 18 is loosely inserted into a cam hole 16 in a portion of the sliding plate 10a that protrudes from the sliding plate 10b, and the rotating shaft 18 is rotated by a drive motor 4b via a gear 19. Ru. As shown in FIG. 4, the circular hole 11 of the fixed plate 9 is connected to the circular hole 12 of the sliding plates 10a and 10b.
The screw 3 is passed through a circular hole 11.12 with a smaller diameter. The fixed plate 9 and the sliding plates 10a and 10b are connected to the outer periphery of the circular hole 11 of the fixed plate 9 and the circular hole 1 of the sliding plates 10a and 10b.
The center of the circular hole 11 and the center of the circular hole 12 are eccentrically provided so that the outer periphery of the circular hole 11 and the circular hole 12 touch each other at one point. Hole 1
2 are formed so that they touch at one point.

In FIG. 4, the eccentricity T between the center X' of the circular hole 11 and the center X of the circular hole 12, and the centers Y and Y of the cam 17 and the rotating shaft 18 are shown.
The eccentricity T' between the circular holes 11 and 12 is the same, and when the cam 17 rotates, the center X' of the circular hole 12 is centered around the center X of the circular hole 11. The sliding plates 10a, 10b move in a circular motion with a radius corresponding to the eccentricity T' between the rotating shaft 17 and the rotating shaft 18.
granted to. That is, when the sliding plate 10a (10b) and its circular hole 12 are in the position shown by the solid line, the lower end of the circular hole 12 is in contact with the lower end of the circular hole 11 of the fixed plate 9, and the circular hole 12 is in contact with the lower end of the circular hole 11 of the fixed plate 9.
The upper end of 2 is located further above the upper end of the circular hole 11, thereby creating a space 20 above. Also this space 20
The cake being pressed by the screw 3 bulges out and enters the space.

Next, when the sliding plate 1ea (10b) moves circularly as described above and the sliding plate 10a (10b) and the circular hole 12 move to the position shown by the dotted line in the figure, the space 20 is moved to the right of the circular hole 11. 20'. At this time, space 2
The cake that was stuck in 0 is sliding plate 1ea (10b)
As the space 20' moves, it is pushed back inward, and the space 20'
A new cake enters inside due to the pressing force of the screw 3. Therefore, the cake that is being compressed in the axial direction by the screw 3 is simultaneously repeatedly expanded and pushed back in the circumferential direction, and this vibration action causes moisture in the deep part of the cake to move to the surface. Water separation is promoted and dehydration efficiency is improved.

Dewatering is also facilitated by the constant change in the surface of the cake as it expands and pushes back, exposing new surfaces into the apparatus and allowing moisture to separate.

The cake cutters 30, 40, 50 are each formed of the structure described above and operate as described above, except that the eccentric cam 17
are arranged with a phase shift.

That is, as shown in FIG.
Eccentric cam 1 inserted into cam holes 16°to', te'' (same shape) of
7° 17', 17'' (same shape) are fixed.Eccentric cams 17, 17', 17'' are arranged with a phase shift of 120 degrees on the circumference, respectively.

The cake cutter 30 is in the state shown in FIG.
．． Assuming that the sliding plates 10a, 10b, the circular hole 12, the cam hole 1B, the cam 17, etc. are in the state shown in the figure, the other two cake cutters 40, 50 disposed with a phase shift are in the sixth position.
As shown in the figure and FIG.
a', 10a", 10b', 10b", circular hole 12
', 12', cam hole 1B', 16'', cam 17',
17'', that is, the sliding plate 10a of the cake cutter 30.

The sliding plate 10a' of the cake cutter 40 is in a state where the sliding plate 10b is rotated to the uppermost side in the figure as shown in FIG.

10b' is rotated in a direction with a phase shift of 120 degrees.

Further, the cake cutter 50 has a further 120 mm as shown in FIG.
It is rotating in the direction of degree phase displacement.

The cams 17, 17', 17'' are connected to the common rotating shaft 1 as described above.
8, the sliding plates 10a, 10a',
10a'', 10b, 10b', and 10b'' rotate while maintaining the phase-shifted relationship as described above.

Next, the operation of this embodiment will be explained.

When the screw 3 is rotated to input the cake into the input port 5, the cake is pushed by the blades of the screw 3 and enters the cake cutter 30. A sliding plate 10a along the fixed plate 9,
As described above, the cake is dehydrated by the sliding action of the cap 10b, which is repeatedly subjected to the force and push back action.
The partially dehydrated cake at 0 enters the next cake cutter 40, undergoes the same action as above with a phase shift of 120 degrees, and then enters the cake cutter 50. Here, the cake is similarly dehydrated and advances to the discharge port 6 while becoming solid.
The compressed water is further compressed and dehydrated by the pressing force of the spring 7 that presses the water. The dehydrated cake causes the sliding post 8 to retreat against the spring 7 by the forward force of the screw 3, and the discharge port 6 is pushed open to discharge the solid content.

As shown in 1, the inserted cake is cut into 3 sets of cake cutters 3.
0.40.50 is sufficiently dehydrated, and 120
Since the water is bulged out and pushed back in the direction of phase displacement, the wavy tendency as in the prior art is disrupted and water is dehydrated in an averaged state, resulting in improved dewatering efficiency.

In addition, 12 sliding plates 10a, 10b, etc. are installed for each cake cutter.
Since it is fixed to the rotating shaft 18 with a 0 degree shift, the weight balance of the sliding plate of the entire device is improved, the circular movement of the sliding plate is smoothly driven, and the load applied to the device is uniform during operation. As a result, the service life of the equipment can be extended.

The above embodiment is a sliding plate 1 of a cake cutter 30, 40, 50.
0a, 10a', 10a'' (10b, 10b'
, 10b'') are the same. Next, an embodiment will be described in which the sliding stroke is changed from the cake input port 5 side toward the cake discharge port 6.

As shown in FIG. 8, cake cutters 30', 40'.

The eccentric cams 17a, 17'a, 17'' are disposed with a phase shift of 120 degrees as in the above embodiment.
a is formed so that the amount of eccentricity decreases gradually toward the discharge port 6. As a result, the sliding plates 10a', 10 near the discharge port 6
The sliding stroke of a'' will gradually decrease.

The cake is easily dehydrated on the side of the input port 5, and gradually dehydrated and becomes solid as it progresses toward the side of the discharge port 6.

Therefore, by reducing the sliding strokes of the sliding plates 10a, 10a', 10a'' toward the outlet 6 side, well-balanced juice extraction and dewatering operations can be performed without applying excessive force to the device. And sufficient dehydration can be obtained.

In the above embodiment, three sets of cake cutters were arranged in parallel, but the invention is of course not limited to this. However, in practice, three sets of cake cutters are desirable because they are well-balanced and can be implemented relatively easily.

The present invention can be applied not only to a device in which the sliding plate moves in a circular motion as described in the embodiments, but also to a device in which the sliding plate moves back and forth from side to side or up and down, or to a device in which the sliding plate moves back and forth. In addition, all of these, including the one described in this embodiment, have a dead center in the movement of the sliding plate. Here, the dead point is the change in the movement of the center of the sliding plate (the center of the hole provided in the sliding plate for passing the screw through) towards the screw axis and the movement away from it. point, and the phase displacement of the sliding plate between each cake cutter is
At least the dead centers should be adjusted so that they do not coincide.

[Effect of the Invention J As is clear from the above explanation, according to the present invention, it is possible to uniformly bulge and push back the cake in the circumferential direction of the screw cylinder, which is being compressed by the screw in the axial direction of the screw cylinder. By changing the expansion and pushing back according to the degree of dehydration of the cake as it moves forward, it is possible to increase the effect of uniform dehydration and improving the durability of the device without putting an unreasonable load on the device. I can do it.

[Brief explanation of the drawing]

FIG. 1(a) is a plan view of one embodiment of the present invention, FIG. 2(b) is a side vertical sectional view thereof, FIG. 2 is a sectional view taken along the line ■-■ of FIG. 1(a), and FIG. 4 is an explanatory diagram of the operation of the embodiment; FIG. 5 is an explanatory diagram showing the phase displacement states of three sets of cake cutters in the embodiment; FIGS. 6 and 7 are Second
FIG. 8, which is a cross-sectional view of another cake cutter similar to the one shown in the figure, is an explanatory diagram showing differences in sliding strokes and one phase displacement state of three sets of cake cutters according to another embodiment of the present invention. l...screw tube, 2...window, 3...screw, 4a, 4b...drive motor, 5...inlet, 6...outlet, 7...spring, 8 ...Sliding tube, 9, 9', 9''...Fixing plate, 10a,
10a', foa', 10b, 10b', 1(
lb''...Sliding plate, 11, 12.12', 12=...
... Circular hole, 13 ... Support shaft, 14 ... Bracket, 1
5...Connection shaft, 18, 18', 1B"...Cam hole, 17, 17', 17", 17'a, 17"a-
eccentric cam. 18... Rotating axis, 18... Gear, 20... Space. 30, 30'...Cake cutter near the input opening. 40, 40'...middle cake cutter, 50, 50'
...Cake cutter near the outlet. Applicant Sanshu Kaken Kogyo Co., Ltd. Agent Yutaka 1) Yoshio Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1) A screw for pushing the object to be processed in the axial direction is passed through holes in a large number of fixed plates and sliding plates arranged alternately, and the sliding plate is inserted in a direction perpendicular to the axis of the screw. While sliding,
In a screw press dehydrator that squeezes water from the object to be treated and dehydrates it through a gap between the fixed plate and the sliding plate, at least two or more sets of combination bodies formed from the fixed plate and the sliding plate are provided. A screw press dewatering machine equipped with a plurality of sets of cake cutters, characterized in that the cake cutters are arranged in parallel along the axial direction of the screw, and the sliding period of the sliding plates of each combination is shifted in phase. 2) The stroke of the sliding plate of the combination formed of the fixed plate and the sliding plate is smaller on the discharge port side than on the input port side of the material to be treated. A screw press dehydrator equipped with a plurality of sets of cake cutters according to Scope 1.