JP2002346794A - Outer jacket unit for screw press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer jacket unit for a screw press for preventing the deviation and the deformation of a screen caused by the frictional resistance of a cake. SOLUTION: By fitting reinforcing plates 21 fixed to the outer circumferential surface of the screen 19 into annular grooves 15 which are grooved on the inner circumferential surface of a semicylindrical outer jacket 14, force applied to the screen 19 in the carrying-out direction is balanced. Further, by placing the edges 20 of the screen 19 on the flanges 16 at both ends of the outer jacket 14, screwing and fixing the screen 19 to the flanges 16 of the outer jacket 14 with fixing screws inserted through a plurality of fixing plates, locking the tips of the set screws which are screwed to a plurality of press plates tothe edges 20 of the screen 19 and joining together a pair of the outer jackets 14, force in the circumferential direction added to the screen 19 is stopped and the deformation of the screen 19 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer cylinder unit of a screw press having a screen stretched, and in particular,
The present invention relates to an improvement in an outer cylinder unit of a large screw press suitable for a slurry having good dehydration properties.

[0002]

2. Description of the Related Art Conventionally, the properties of a slurry fluctuate depending on the season, and a slurry having a very good dewatering property is pressed into a screw press to form a cake having an unexpectedly low water content. This low moisture cake increases frictional resistance between the screw blades and the screen. Then, in order to reinforce the screen of the outer cylinder, a metal filter medium laminated in several stages is stretched over a semi-cylindrical support frame having through holes, and a pair of support frames stretched with the metal filter medium are combined. A screw press in which the outer cylinder is attached to form an outer cylinder to provide the strength of the screen has been proposed by the applicant of the present invention, for example, in Japanese Patent Publication No. 7-13917.

[0003]

The low-moisture cake supplied to the screw press described above has a large force in the unloading direction applied to the screen due to frictional resistance and a large force in the rotating direction of the screw. Of the cake, the screen may be deformed and the screen on the exit side of the cake may be damaged. Although an increase in the strength of the screen is required, there is a limitation that the screen thickness cannot be larger than the hole diameter of the screen. When the hole diameter of the screen is increased to increase the thickness of the screen, there is a problem that the turbidity of the filtrate is deteriorated and the recovery rate of the filtrate is deteriorated. Further, in the conventional metal filter media laminated in several stages, although the strength of the filter media is increased and the hole diameter of the screen is reduced, there is a disadvantage that the metal media is easily clogged. SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention reinforces a conventional screen, and displaces the screen in the carry-out direction and the rotation direction due to the frictional resistance of the cake, and prevents the screen from being deformed. The purpose is to provide.

[0004]

The gist of the present invention is that a screen is stretched over a semi-cylindrical outer cylinder having a large number of through holes, and a pair of outer cylinders having the screen stretched are joined together. In the screw press which became the outer cylinder unit
An annular groove is bored in the inner peripheral surface of the semi-cylindrical outer cylinder, and a reinforcing plate is fixed to the outer peripheral surface of the screen, and the reinforcing plate of the screen is fitted in the annular groove of the outer cylinder, and the discharge direction and This is to prevent the screen from shifting in the circumferential direction. Specifically, the edges of the screen stretched over the semi-cylindrical outer cylinder are placed on the flanges at both ends of the outer cylinder, and the screen is screwed onto the flange of the outer cylinder with fixing screws inserted through a plurality of fixing plates. At the same time, the ends of the set screws screwed to the plurality of holding plates are locked to the edges of the screen, and a pair of semi-cylindrical outer cylinders are joined together. The outer surface of the screen is reinforced by the fixed reinforcing plate, and the force applied to the screen in the unloading direction by the frictional resistance of the cake by the reinforcing plate of the screen fitted into the annular groove of the outer tube. And at the same time, against the force in the rotating direction of the screw applied to the screen by the fixing plate and the holding plate at the edge of the screen, to prevent the screen from shifting in the unloading direction and the rotating direction and preventing the screen from deforming. Can be. Also, if the hole diameter of the screen stretched over the outer cylinder is made to be a pore from the supply side to the carry-out side, the solid content is prevented from passing through the screen where the internal pressure increases, and the filtrate turbidity deteriorates. Without this, the filtrate recovery rate is improved.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The outer cylinder unit of the screw press according to the present invention is constructed as described above, and a reinforcing plate fixed to the outer peripheral surface of the screen is formed in an annular groove formed in the inner peripheral surface of the outer cylinder. Since it is inserted, the outer peripheral surface of the screen is reinforced by the fixed reinforcing plate, and the reinforcing plate of the screen inserted into the annular groove of the outer cylinder is used to oppose the frictional resistance of the cake in the unloading direction on the screen. Misalignment is prevented. Then, the edge of the screen is fixed to the flange of the outer cylinder with a fixing plate using fixing screws, and the ends of the set screws screwed to the holding plate are locked to the edges of the screen, and the edges of the screen are removed. Pressing between the flanges of the tube prevents the screw in the rotating direction of the screw shaft from being applied to the screen by the fixed plate and the holding plate. There is no one. In addition, if the hole diameter of the screen stretched to the outer cylinder is made pores from the supply side to the carry-out side, the solid content can be prevented from passing through the screen where the internal pressure increases, and the filtrate turbidity can be reduced. The filtrate recovery rate is improved without deterioration.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Is a screw press, and a screw press 1 is supported on front and rear frames 2 and 3, and the screw press 1 winds a screw blade 6 around an outer cylinder unit 5 having a screen 4 stretched on an inner peripheral portion. And a screw shaft 7. In this embodiment, the screw shaft 7 disposed inside the outer cylinder unit 5 reduces the relative distance from the start end to the end. A sludge supply passage 8 is provided at the start end of the screw shaft 7, and a supply hole 9 of the supply passage 8 is opened at the start end side of the outer cylinder unit 5. A drive shaft 10 is connected to the end of the screw shaft 7, and a drive sprocket 11 is connected to the drive shaft 10.
Is fitted. Then, the screw blade 6 wound around the screw shaft 7 transports the sludge supplied to the start end of the outer cylinder unit 5 toward the terminal end, and separates the filtrate from the screen 4 of the outer cylinder unit 5 while filtering and filtering. Dehydrate,
The dehydrated cake is discharged from the discharge port 13 to which the back pressure is applied by the pressing plate 12.

FIG. 2 is a perspective view of the outer cylinder. The outer cylinder 14 has a semi-cylindrical outer cylinder 14 provided with a large number of through-holes on its peripheral surface. Grooves 15 are provided. In the embodiment of the present invention, the outer cylinder 14 uses a punching metal. Both ends of the semi-cylindrical outer cylinder 14 are bent to form flanges 16, 16, and a step 16 a is formed inside the flange 16 in the front-rear direction.
A plurality of annular ribs 17 are fixed to the peripheral portion of the outer cylinder 14, and the front and rear ribs 17, 17 are fixed by a connecting rod 18 to reinforce the peripheral portion of the outer cylinder 14. FIG. 3 is a perspective view of a screen stretched over the outer cylinder, in which a short semi-cylindrical screen 19 having a large number of pores is provided with an edge 2 at both ends.
The screens 19 are reinforced by fixing reinforcing plates 21 and 21 to outer peripheral surfaces of front and rear ends of the screen 19, respectively. FIGS. 4 and 5 are a plan view and a side view, respectively, in which the screen is fitted in the outer cylinder. The semi-cylindrical screen 19 is fitted in the semi-cylindrical outer cylinder 14, and the flange 16 of the outer cylinder 14 shown in FIG. The edge 20 of the screen 19 shown in FIG. 3 is placed on the step 16a. Further, reinforcing plates 21 and 21 fixed to the outer peripheral surface of the screen 19 shown in FIG. 3 are adapted to fit into the annular groove 15 formed in the inner peripheral surface of the outer cylinder 14 shown in FIG.
4, reinforcing plate 21 of screen 19 fitted in annular groove 15
Thus, the screen 19 is prevented from being displaced inside the outer cylinder 14 against the force in the carry-out direction on the screen 19 due to the frictional resistance of the cake.

FIGS. 6 and 7 are longitudinal side views showing a state in which the screen is mounted on the outer cylinder. As shown in FIG. 6, the screen 19 mounted on the step 16a of the flange 16 of the outer cylinder 14 is shown in FIG. A plurality of fixing plates 22 contact the edge 20, and fixing screws 23 inserted into the fixing plates 22 are screwed into the flanges 16 of the outer cylinder 14 through the screen 19. As shown in FIG. 7, a holding plate 24 is in contact with the edge 20 of the screen 19 between the plurality of fixing plates 22. As shown in FIG. The sharp-angled tip portion 25 a of the screw 25 is cut into the pore of the screen 19. Then, the fixing plate 2 is attached to the screen 19.
4 and a pair of outer cylinders 14, 14 in contact with the holding plate 24, are attached to each other to form a mounting hole 26 in the flange 16 of the outer cylinder 14 shown in FIG.
Are fastened with fixing bolts (not shown).
Is formed in a cylindrical shape. The fixing plate 22 sandwiching the edge 20 of the screen 19, the flat surface of the holding plate 24, and the fixing screw 23 and the set screw 25 cut into the screen 19 prevent the force in the rotation direction of the screw shaft 7 applied to the screen 19. Thus, the displacement of the screw shaft 7 in the rotation direction is suppressed, and the deformation of the screen is prevented. The two ends of the pair of outer cylinders 14 formed in a circular shape are attached to mounting holes 29 of the outer cylinder ribs 17, 17 shown in FIG.
Are fixed to each other with fixing bolts (not shown) so as to form the long outer cylinder unit 5.

FIG. 9 is a conceptual diagram showing a state in which the screen is arranged in parallel with the outer cylinder.
A plurality of semi-cylindrical screens 19 are fitted in parallel. In the embodiment of the present invention, the screens 19 that are stretched over the outer cylinder 14 are screens 19a and 19b whose hole diameters are sequentially reduced from the supply side to the discharge side.
19c and 19d are stretched, and the relative spacing is reduced from the start end to the end, so that solids do not pass through the screens 19a, 19b, 19c and 19d, which increase the internal pressure of the filtration chamber. As described above, the pores are sequentially formed, the filtrate turbidity does not deteriorate, and the filtrate recovery rate is improved.

[0010]

The outer cylinder unit of the screw press according to the present invention is constructed as described above, and an annular groove is formed in the inner peripheral surface of the semi-cylindrical outer cylinder. A reinforcing plate fixed to the outer peripheral surface is fitted, and the outer cylinder is attached by attaching the edge of the screen to the flange of the outer cylinder,
The screen can be prevented from shifting in the carry-out direction and the circumferential direction. In other words, the thickness of the screen has a limitation that it cannot be manufactured beyond the hole diameter of the screen, and the low-moisture cake has an increased frictional resistance between the screw blade and the screen, and the force in the unloading direction applied to the screen and the screw The force in the rotation direction of the shaft increases, and the screen may be deformed and the screen may be damaged. Further, the metal filter medium laminated in several stages has a difficulty in regenerating the filter medium by washing. The screen was pressed against the flange with a fixing screw placed on the flange and inserted into the fixing plate, and a set screw screwed to the holding plate, and the plurality of outer cylinders were joined to form an outer cylinder unit. Therefore, the outer peripheral surface of the screen is reinforced by the fixed reinforcing plate, and the reinforcing plate of the screen fitted in the annular groove of the outer cylinder is used to oppose the force in the unloading direction on the screen due to the frictional resistance of the cake, and at the same time, the end of the screen. The fixing plate and the holding plate are pressed against the screen by the edge fixing plate and the fixing screw and the set screw are cut into the screen, so the force in the rotation direction of the screw shaft applied to the screen can be prevented, and the unloading direction and the rotation direction To school In which shift the screen of deformation over emissions is prevented. And since the hole diameter of the screen stretched over the outer cylinder is made pores from the supply side to the discharge side, the solid content is prevented from passing through the screen where the internal pressure gradually increases, and the filtrate turbidity deteriorates. And the filtrate recovery rate is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a screw press according to the present invention.

FIG. 2 is a perspective view of an outer cylinder of the outer cylinder unit according to the present invention.

FIG. 3 is a perspective view of a screen of the outer cylinder unit.

FIG. 4 is a plan view of an outer cylinder in which a screen is fitted.

FIG. 5 is a side view of the outer cylinder in which a screen is fitted.

FIG. 6 is a vertical sectional side view showing a state where the screen is attached to the flange of the outer cylinder by the fixing plate.

FIG. 7 is a vertical sectional side view showing a state where the screen is attached to the flange of the outer cylinder by the press plate.

FIG. 8 is an enlarged view of a set screw screwed into the holding plate shown in FIG. 7;

FIG. 9 is a conceptual diagram showing a state in which a screen is arranged in parallel with an outer cylinder.

[Explanation of symbols]

 Reference Signs List 5 outer cylinder unit 14 outer cylinder 15 annular groove 16 flange 19, 19a, 19b, 19c, 19d screen 20 edge 21 reinforcing plate 22 fixing plate 23 fixing screw 24 holding plate 25 set screw

Claims (3)

[Claims] A semi-cylindrical outer cylinder (1) having a large number of through holes.
4) A screen (19) is stretched, and a pair of outer cylinders (14, 14) having the screen (19) stretched is joined to form an outer cylinder unit (5). An annular groove (1) is formed on the inner peripheral surface of the outer cylinder (14).
5), a reinforcing plate (21) is fixed to the outer peripheral surface of the screen (19), and the reinforcing plate (21) of the screen (19) is fitted into the annular groove (15) of the outer cylinder (14). An outer cylinder unit for a screw press. 2. An edge (20) of a screen (19) stretched over the semi-cylindrical outer cylinder (14) is mounted on flanges (16) at both ends of the outer cylinder (14). Fixing plate (22
…)) And the screen (1) with fixing screws (23…).
9) is screwed to the flange (16) of the outer cylinder (14), and is screwed to a plurality of holding plates (24).
Is fixed to the edge (20) of the screen (19), and a pair of semi-cylindrical outer cylinders (14, 14) are joined together.
2. An outer cylinder unit for a screw press according to claim 1, wherein the fixing plate (22...) And the presser plate (24) are clamped and fixed by a flange (16) of the outer cylinder (14). 3. The screen (19) stretched over the outer cylinder (14) has a hole diameter (19a, 19b, 19c, 19d) from the supply side to the discharge side. The outer cylinder unit of the screw press according to claim 1 or 2.