Screw press screen cleaning equipment

Abstract

To provide a washing device of a cylindrical screen which can prevent a blockage of a washing nozzle of a washing tube by constituting the washing tube to be able to revolve and in which the washing nozzle can be easily detached.SOLUTION: A screen washing device of a screw press in which a washing tube having a plurality of washing nozzles is attached to a washing guide body provided on the outside of a cylindrical screen comprises: the washing guide body which is movable over the entire length of the screen; a pair of washing tubes which can be engaged with the washing guide body; and a washing tube revolution device which revolves each washing tube such that the washing tubes are located at discharge positions in the time of washing and the washing tubes are located at separation positions in the time of dehydration operation, and can prevent a blockage of the washing nozzle.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a screen cleaning device for a screw press that sprays a cleaning liquid onto a cylindrical screen from the outside. [Background technology]

[0002] Conventionally, a screw press has been used as a solid-liquid separator. The screw press has a cylindrical screen on which a screw shaft with screw blades wound around it is disposed, and the sludge supplied to the start end of the outer cylinder is transported while the screw shaft is rotated, while the filtrate is discharged through the screen and dewatered sludge is taken out from the end end of the outer cylinder.

[0003] Patent Document 1 discloses a screw press in which nozzles of washing pipes are arranged in an annular shape and washing water is sprayed onto the outer periphery of the screen to wash the screen.

[0004] Furthermore, Patent Document 2 discloses a technique for preventing clogging of the nozzle by changing the direction of the lower cleaning pipe using a rotary drive device when cleaning is not in progress. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 63-11198 [Patent Document 2] Patent Publication No. 2021-62323 Summary of the Invention [Problem to be solved by the invention]

[0006] In Patent Document 1, the cleaning nozzle is always located below the screen, so the cleaning nozzle is prone to clogging due to solids mixed in the filtrate that passes through the screen during the dehydration operation of the screw press and sludge that passes through the screen. In order to clean a clogged cleaning nozzle, it is necessary to remove the cleaning pipe from the screw press body, which makes maintenance work time-consuming.

[0007] In Patent Document 2, when not cleaning, the rotary drive device is driven to point the lower cleaning pipe in the opposite direction to the screen, preventing solid matter from accumulating in the cleaning nozzle. However, since this configuration rotates only the lower cleaning pipe, it cannot be applied to cleaning pipes that are formed in a semicircular shape from the top to the bottom of the screen.

[0008] The present invention provides a screen cleaning device for a screw press that can prevent clogging of the cleaning nozzle by rotating the cleaning pipe to a position away from the screen when not cleaning, and can easily perform maintenance work on the cleaning nozzle by configuring the cleaning pipe to be rotatable. [Means for solving the problem]

[0009] The present invention relates to a screen cleaning device for a screw press in which a cleaning pipe equipped with a plurality of cleaning nozzles is attached to a cleaning guide body provided outside a cylindrical screen, the cleaning guide body being movable over the entire length of the screen, and a pair of cleaning pipes being engageable with the cleaning guide body, a connecting cleaning pipe that branches off laterally from the cleaning pipe and bends downward; a washing pipe rotating device that rotates each washing pipe so that the washing pipe is positioned at the discharge position during washing and the washing pipe is positioned at the separated position during dehydration operation; The cleaning pipe rotating device is composed of a rotating drive, a rotating shaft that is supported by the cleaning guide body and connected to the bent portion of the connecting cleaning pipe, and is rotatable around the central axis of the rotary joint, and a rotary joint that connects the connecting cleaning pipe and the cleaning liquid supply pipe. This allows the cleaning pipe to be rotated away from the screen when not cleaning. [Effects of the Invention]

[0012] According to the present invention, by rotating the washing pipe to a position away from the screen when not washing, clogging of the washing nozzle due to SS components in the filtrate discharged during spin-drying operation can be prevented. Furthermore, there is no need to manually rotate the washing pipe, which saves the operator time. By configuring the washing pipe to be rotatable, maintenance work on the washing nozzle can be easily performed without removing the washing pipe from the screw press body. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic cross-sectional view of a screw press according to the present invention. [Figure 2] 1 is a front view of a cleaning device for a screw press according to the present invention. FIG. [Figure 3] 1 is a partially enlarged view of a cleaning device for a screw press according to the present invention. [Figure 4] 1 is a side view of a cleaning device for a screw press according to the present invention. [Figure 5] FIG. 2 is a side view of the cleaning device for a screw press according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] FIG. 1 is a schematic cross-sectional view of a screw press according to the present invention. First, a screw press 101 in which a screen cleaning device 1 according to an embodiment of the present invention is used will be described with reference to FIG. The screw press 101 is equipped with a screw shaft 104 having screw blades 103 wound around a screen 102 having a filtering surface on its periphery. The diameter of the screw shaft 104 increases from the sludge supply side toward the cake discharge side, and a filtering chamber 105 between the screen 102 and the screw shaft 104 decreases from the supply side toward the discharge side.

[0015] The configuration of the supply side of the screw press 101 will be described. In the screw press 101, a supply path for the flocculated slurry is provided in the screw shaft 104, a supply hole 106 is opened at the beginning of the filtration chamber 105, and an extension of the screw shaft 104 is connected to a thickened sludge supply pipe (not shown). The thickened sludge is forced into the filtration chamber 105 from the supply hole 106 and is supplied from between the screw blades 103 wound around the screw shaft 104, and is arranged so that thickened sludge such as flocculated soft sludge is not affected by the screw blades 103.

[0016] The following describes the configuration of the discharge side of the screw press 101. In the screw press 101, a rotating plate connected to the discharge side of the screen 102 is supported on a frame 108, and a screw drive shaft 109 is connected to a screw shaft 104 installed inside the screen 102. A back pressure adjusting presser 115, installed opposite a discharge port 117 of the filtration chamber 105, is slidably supported on a moving shaft 116 arranged on the frame 108.

[0017] A screw drive shaft 109 connected to the screw shaft 104 is journaled in a bearing 111 provided on a stand 110 of a frame 108. A sprocket 112 is fitted to the screw drive shaft 109, which is interlockingly connected to a screw driver 113 mounted on the frame 108. The screw driver 113 of the screw shaft 104 is operated to supply thickened sludge from the supply hole 106 of the screw shaft 104 to the filtration chamber 105, and the thickened sludge is transported by the screw blades 103 while the filtrate is separated from the screen 102.

[0018] The opening size of the discharge port 117 of the filtration chamber 105 is adjusted by a presser 115, and solid-liquid separation is promoted while applying back pressure to the filtration chamber 105, thereby discharging the dehydrated cake. A filtrate trough 114 is disposed below the screen 102, and a cake receiving tank for receiving the dehydrated cake is disposed adjacent to the filtrate trough 114 at the end of the screw press 101. In addition, a screen washing device 1 is provided around the screen 102 on the discharge side (P1) as shown in the figure.

[0019] For ease of explanation, the horizontal direction in which the sludge supply side of the screen cleaning device 1 (screw press 101) is the front side and the cake discharge side is the rear side will be referred to as the front-to-rear direction, the horizontal direction perpendicular to the front-to-rear direction will be referred to as the left-to-right direction, and the direction perpendicular to the front-to-rear direction and the left-to-right direction will be referred to as the up-to-down direction.

[0020] 2, the screen cleaning device 1 is formed in a generally annular shape and is provided in a screw press 101 so that a cylindrical screen 102 passes through the annular shape. The screen cleaning device 1 is capable of moving in the front-to-rear direction over the entire length of the screen 102 (between P1 and P2).

[0021] As shown in Fig. 2 etc., the screen cleaning device 1 is configured to include a cleaning guide body 5 and a cleaning pipe 7. The cleaning guide body 5 is provided slightly away from the screen 102 of the screw press 101 and outside the screen 102.

[0022] The cleaning pipe 7 is configured to be able to engage with the cleaning guide body 5. The cleaning pipe 7 is provided with a plurality of cleaning nozzles 11, which are configured to discharge (spray) the cleaning liquid that has flowed inside the cleaning pipe 7 toward the screen 102.

[0023] The screen cleaning device 1 is connected to a cleaning pipe rotating device 15. The cleaning pipe rotating device 15 has a mechanism for rotating the cleaning pipe 7 from a discharge position P3 (see FIGS. 2 and 4) to a separation position P4 (see FIG. 5).

[0024] As shown in Figures 2 and 3, the cleaning pipe rotating device 15 is composed of a rotating drive mechanism 37, a rotating shaft 19, and a rotary joint 29, and can rotate the cleaning pipe 7 around the central axis C1 of the rotary joint 29, which is installed in the vertical direction.

[0025] As shown in Figure 4, at the discharge position P3, in order to clean the screen 102, the cleaning pipe 7 is integrally engaged with the cleaning guide body 5, and cleaning liquid (see Figure 2) is discharged from the cleaning nozzle 11 toward the screen 102.

[0026] 5, at the separated position P4, the cleaning pipe 7 is rotated to separate the cleaning nozzle 11 from the screen 102 to prevent the cleaning nozzle 11 from becoming clogged with suspended matter in the filtrate discharged from the screen 102 during the spin-drying operation. By being able to rotate to the separated position P4, if the cleaning nozzle 11 becomes clogged, the cleaning nozzle 11 can be removed from the cleaning pipe 7 located at the separated position P4, facilitating maintenance work such as cleaning the nozzle.

[0027] The screen cleaning device 1 is also provided with a cleaning guide body moving section 17 (see FIGS. 1 and 2). The cleaning guide body moving section 17 moves the cleaning guide body 5 together with the cleaning pipe 7 in the extension direction of the central axis of the screen 102 (front-rear direction) when the cleaning pipe 7 is at the discharge position P3. That is, when the cleaning pipe 7 is at the discharge position P3, the cleaning guide body moving section 17 moves the screen cleaning device 1 between a position P1 (rear end position) shown by a solid line in FIG. 1 and a position P2 (front end position) shown by a two-dot chain line.

[0028] When the cleaning guide body 5 and the cleaning pipe 7 are moved by the cleaning guide body moving part 17, cleaning liquid is discharged from the cleaning nozzles 11 to clean the screen 102. When the screen 102 is being cleaned, as shown in Fig. 2, each of the cleaning liquid discharge ports of the multiple cleaning nozzles 11 faces the screen 102 at a slight distance from the screen 102. Furthermore, when the screen 102 is being cleaned, the distance between each of the cleaning liquid discharge ports of each cleaning nozzle 11 and the screen 102 (the distance in the radial direction of the screen 102) is constant.

[0029] In the screen cleaning device 1, when the cleaning pipe 7 rotates relative to the cleaning guide body 5 and when the cleaning pipe 7 is in the separated position P4, the cleaning guide body 5 and the cleaning pipe 7 are positioned at a predetermined position in the front-rear direction by the cleaning guide body moving part 17. The predetermined position in the front-rear direction is, for example, the rear end position P1 (see FIG. 1).

[0030] The cleaning pipe 7 is formed in a semicircular arc shape (a circular arc shape that is slightly shorter than a semicircular arc). In addition, in the vertical direction, the upper end of the cleaning pipe 7 is located above the screen 102, and the lower end of the cleaning pipe 7 is located below the screen 102. Furthermore, in the vertical direction, the center of the cleaning pipe 7 and the center of the screen 102 are aligned with each other.

[0031] As shown in FIG. 2, the cleaning guide bodies 5 are formed in a semicircular arc shape and provided in pairs, and by joining the pair of cleaning guide bodies 5 (5A, 5B) to each other, the pair of cleaning guide bodies 5 form a circular ring shape.

[0032] One of the joint portions 21 of the pair of cleaning guide bodies 5, joint portion 21A, is located at the upper end of the cleaning guide body 5. The other of the joint portions 21 of the pair of cleaning guide bodies 5, joint portion 21B, is located at the lower end of the cleaning guide body 5.

[0033] The cleaning pipes 7 are also provided in pairs, and when the pair of cleaning pipes 7 are in the discharge position P3, as shown in Figure 2, when viewed in the front-to-back direction, each of the arcs of the pair of cleaning pipes 7 overlaps with each of the arcs of the pair of cleaning guide bodies 5.

[0034] When viewed in the front-to-rear direction, the centers of the circles of the pair of annular cleaning guide bodies 5 (5A, 5B) and the center of the circle of the screen 102 coincide with each other. Furthermore, when viewed in the front-to-rear direction with the pair of cleaning pipes 7 at the discharge position P3, the centers of the arcs of the pair of cleaning pipes 7 and the center of the circumference of the screen 102 coincide with each other.

[0035] 2, the cleaning guide body moving part 17 is configured to include a rail member 23 and a cleaning guide body support member 25. The rail member 23 extends in the front-rear direction above the cleaning guide body 5 and away from the cleaning guide body 5.

[0036] The lower end of the cleaning guide body support member 25 is provided integrally with the cleaning guide body 5 , and the upper portion of the cleaning guide body support member 25 protrudes upward from the cleaning guide body 5 .

[0037] The upper end of the cleaning guide body support member 25 engages with the rail member 23, so that the cleaning guide body 5 and the cleaning pipe 7 can move in the extension direction (front-to-back direction) of the central axis of the screen 102 while suspended when the cleaning pipe 7 is in the discharge position P3.

[0038] The cleaning pipe swiveling device 15 will now be described. As shown in Figure 3, the connecting cleaning pipe 9, which branches off from the side of the cleaning pipe 7 and bends downward, is connected to the top of the rotary joint 29. A swivel shaft 19 is connected to the bent part of the connecting cleaning pipe 9, and the swivel shaft 19 is able to rotate around the central axis C1 of the rotary joint 29 as a fulcrum. The swivel shaft 19 is appropriately fixed to the cleaning guide body 5 by a support member 28. A bearing is provided inside the support member 28, allowing the swivel shaft 19 to rotate.

[0039] A cleaning liquid supply pipe 32 is connected to the lower part of the rotary joint 29. The cleaning liquid supply pipe 32 is fixed to the cleaning guide body 5 by a fixing member 27, and is configured not to rotate at all even when the swivel shaft 19 is rotating.

[0040] The rotary joint 29 is, for example, a coupling, and the fluid flowing inside it does not leak to the outside. When washing the screen 102, the washing liquid supplied into the dehydrator is conveyed through the lower washing liquid supply pipe 32, the rotary joint 29, and the connecting washing pipe 9 in this order, and is introduced into the washing pipe 7.

[0041] The upper end of the swivel shaft 19 changes the direction of the rotation axis by connecting a universal joint member 33, such as a universal joint, to a swivel drive shaft 35, and is connected to a swivel drive machine 37 mounted on the top of the cleaning guide body moving section 17. Power is received from the swivel drive machine 37, causing the swivel shaft 19 to rotate about the rotation center axis C1, and the connecting cleaning pipe 9 connected to the swivel shaft 19 rotates together with the cleaning pipe 7. This allows the cleaning pipe 7 to rotate. Note that the swivel shaft 19 may also be rotated by connecting swivel drives 37, 37 to the pair of swivel shafts 19, 19, respectively.

[0042] In the embodiment of the present invention, the washing pipe 7 is rotated using the above-described configuration, but other mechanisms may also be used to rotate the washing pipe 7. Furthermore, in this embodiment, the washing pipe 7 is supported and rotated only by the connecting washing pipe 9, but a separate member may also be used, and the present invention is not limited to this configuration. [Example]

[0043] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. <Dehydration process> After the cleaning guide body 5 is stopped at a specific position by the cleaning guide body moving unit 17, the cleaning pipe 7 is rotated to the separated position P4. By performing the spin-drying operation in this state, it is possible to prevent the filtrate separated and discharged from the screen 102 from adhering to the cleaning nozzle 11 of the cleaning pipe 7.

[0044] <Cleaning process> With the cleaning pipe 7 rotated to the discharge position P3, the cleaning guide body 5, with which the cleaning pipe 7 is integrally engaged, is moved over the entire length of the screen 102 by the cleaning guide body moving unit 17. At this time, cleaning liquid is sprayed from the cleaning pipe 7 onto the screen 102 to remove dirt adhering to the screen 102 and eliminate clogging of the screen 102. After cleaning is completed, the cleaning pipe 7 is rotated again to the separation position P4.

[0045] <Inspection process> The cleaning guide body moving part 17 is stopped, and the cleaning pipe 7 is rotated to the separated position P4. At this time, by setting the stopping position of the cleaning guide body moving part 17 to a position where the cover (not shown) on the side of the spin dryer frame can be removed, the cleaning pipe 7 and cleaning nozzle 11 can be easily inspected and replaced.

[0046] In the present invention, the washing pipe is rotated automatically at the beginning of each step, but it may be rotated manually depending on the situation.

[0047] Furthermore, by rotating the cleaning pipe 7 at any angle and moving the cleaning guide body moving part 17, the cleaning surface of the cleaning nozzle 11 spreads in multiple directions, allowing the cleaning liquid to be sprayed in all directions. [Industrial Applicability]

[0048] Although the present embodiment has been described above, the present embodiment is not limited to this. Various modifications are possible within the scope of the gist of the embodiments. The cleaning device of the present invention can be used to clean not only screw presses but also solid-liquid separation devices equipped with cylindrical screens, such as drum-type concentrators. [Explanation of symbols]

[0049] 1 Screen cleaning device 5 Cleaning guide body 7 Cleaning pipe 9 Connecting cleaning pipe 11 Cleaning nozzle 15 Cleaning pipe swivel device 19 Swivel axis 29 Rotary Joint 32 Cleaning liquid supply pipe 37 Swing drive 101 Screw Press 102 screens P3 Discharge position P4 Departure position

Claims

[Claim 1] In a screen cleaning device (1) for a screw press (101), a cleaning pipe (7) equipped with a plurality of cleaning nozzles (11) is attached to a cleaning guide body (5) provided outside a cylindrical screen (102), a cleaning guide body (5) that is movable over the entire length of the screen (102); A pair of cleaning pipes (7) engageable with the cleaning guide body (5), a connecting cleaning pipe (9) that branches off laterally from the cleaning pipe (7) and bends downward; and a washing pipe rotating device (15) for rotating each washing pipe (7) so that the washing pipe (7) is positioned at a discharge position (P3) during washing and the washing pipe (7) is positioned at a separated position (P4) during a spin-drying operation. The cleaning pipe rotating device (15) is A slewing drive (37); a rotating shaft (19) that is pivotally supported by the cleaning guide body (5) and connected to the bent portion of the connecting cleaning pipe (9) and that can rotate around the central axis (C1) of the rotary joint (29) as a fulcrum; and a rotary joint (29) that connects the connecting cleaning pipe (9) and the cleaning liquid supply pipe (32). A screw press screen cleaning device characterized by the above.

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