KR101936061B1 - Screen Device for Wastewater Treatment - Google Patents

Abstract

The present invention relates to a screen device for wastewater treatment, capable of performing a screen filter replacement operation conveniently and quickly and enhancing the removal efficiency of foreign matters attached to the screen filter. The device comprises: an extension pipe (72) provided at the other end of a release shaft (70); a shaft fixing plate (73) installed at the end of the extension pipe (72); a guide shaft (74) installed on the shaft fixing plate (73) so as to be parallel to the release shaft (70); and a slide tube (35) formed inside an end cap (30) and coupled to the guide shaft (74) to prevent rotation of the end cap (30) while moving in the axial direction.

Description

Screen Device for Wastewater Treatment [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen device for treating wastewater, and more particularly, to a screen device for wastewater treatment capable of performing a screen filter replacement operation conveniently and quickly, will be.

In general, a wastewater treatment apparatus is a device for purifying sewage and wastewater by filtering biological substances or impurities such as dissolved pollutants, microorganisms and suspended substances contained in sewage and wastewater by a biological process or a physical process.

Such a wastewater treatment apparatus is provided with a filtration screen for separating and removing foreign matter such as various suspended solids, solid matter, impurities, etc. contained in sewage, wastewater, and wastewater while purifying various domestic wastewater, industrial wastewater, livestock wastewater, and high concentration organic wastewater .

Such a filtration screen includes a sheave screen, a drum screen composed of a wedge wire, a drum screen using a mesh screen network, and the like, and the filtration screen is selectively used depending on the purpose, place, and effect of the use.

To this end, Korean Patent Registration No. 10-1813528 proposes a conventional technique in which a screen net formed in a certain shape is installed on a screen box using a fixing bracket to filter out foreign matter contained in the wastewater.

However, this conventional technique has a disadvantage in that it takes a lot of time to work because a large number of bolts and nuts need to be loosened and tightened when exchanging a screen net, and in particular, there is no mechanism for maintaining the shape of a screen net The screen network is vulnerable to external forces and is easily deformed.

In addition, in the conventional art, there is a problem that foreign matter attached to the screen net is removed by using the air blowing, but there is a dead zone where the air bubbles are insufficient, so that it is difficult to completely remove the foreign matter.

Korean Patent Registration No. 10-1813528 (Publication date: Dec. 29, 2017)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide an apparatus and a method for replacing a screen filter easily and quickly, restoring a screen filter freely and preventing a screen filter from being permanently deformed, And an object of the present invention is to provide a screen device for treating wastewater that can improve the removal efficiency of foreign materials attached to the screen filter.

In order to accomplish the object of the present invention, there is provided a screen device for treating wastewater, comprising: a filter housing having a suction pipe formed at one side of the suction pipe, a first filter fixing part in the form of a trumpet tube at the other end, and a first male screw part formed on the outer circumference; An end cap concentric with the filter housing at a distance therefrom, having an end cap formed with a second filter fixing part in the form of a trunk tube and a second male screw part formed on an outer circumferential surface thereof; A flexible screen filter installed between the filter housing and the end cap; A first ring nut coupled to the first male threaded portion to press one end of the screen filter toward the outer peripheral surface of the first filter fixing portion to fix the screen filter; A second ring nut coupled to the second male threaded portion to press and fix the other end of the screen filter toward the outer peripheral surface of the second filter fixing portion; An annular shaft having one end connected to the center of the filter housing and a screw hole formed in the center of the other end; A sleeve formed in the center of the end cap; A screw which is formed at one end of the third or additional member coupled to the screw hole and pulls the end cap in a direction away from the filter housing by rotation to exert a tensile force on the screen filter; A flange formed on an outer circumferential surface of the screw and hooked to the end of the sleeve; A rotation part formed at the other end of the screw and inserted into the sleeve, and having a fourth male screw part formed with a tool engagement groove; And a lock nut coupled to the fourth male threaded portion, characterized in that: an extension pipe provided at the other end of the release shaft; A shaft fixing plate installed at an end of the extension pipe; A guide shaft installed on the shaft fixing plate so as to be parallel to the mold release shaft; And a slide tube which is formed inside the end cap and is coupled to the guide shaft and which prevents the end cap from rotating while moving in the axial direction.

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A filter housing having a suction pipe formed at one side of the center, a first filter fixing part in the form of a trumpet tube at the other end, and a first male screw part on the outer circumference; An end cap concentric with the filter housing at a distance therefrom, having an end cap formed with a second filter fixing part in the form of a trunk tube and a second male screw part formed on an outer circumferential surface thereof; A flexible screen filter installed between the filter housing and the end cap; A first ring nut coupled to the first male threaded portion to press one end of the screen filter toward the outer peripheral surface of the first filter fixing portion to fix the screen filter; A second ring nut coupled to the second male threaded portion to press and fix the other end of the screen filter toward the outer peripheral surface of the second filter fixing portion; An annular shaft having one end connected to the center of the filter housing and a screw hole formed in the center of the other end; A sleeve formed in the center of the end cap; A screw which is formed at one end of the third or additional member coupled to the screw hole and pulls the end cap in a direction away from the filter housing by rotation to exert a tensile force on the screen filter; A flange formed on an outer circumferential surface of the screw and hooked to the end of the sleeve; A rotation part formed at the other end of the screw and inserted into the sleeve, and having a fourth male screw part formed with a tool engagement groove; And a lock nut coupled to the fourth male threaded portion, the radial rib being formed radially from the inner circumferential surface of the filter housing toward the center; A guide bush formed at the center side end of the radial rib and positioned at the center of the filter housing and having an eyelet for guiding the excavating shaft in the axial direction; A cylinder installed in the guide bush; A piston rod which is drawn out of the cylinder and connected to the mold release shaft and oscillates in the axial direction together with the mold release axis; A direction switching valve connected to the cylinder; A valve driving unit for driving the directional control valve; And a controller for outputting a driving signal to the valve driving unit to switch the direction of the flow path from the pressure source to the cylinder so as to shake the foreign substance adhered to the screen filter.

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As described above, the present invention is characterized in that both ends of the screen filter 40 are connected to the filter housing 20 by the first ring nut 50 coupled to the filter housing 20 and the second ring nut 60 coupled to the end cap 30, It is possible to easily and quickly replace the screen filter 40 because it can be separated / joined to the housing 20 and the end cap 30.

Since the end cap 30 is moved in the axial direction along the screw 80 by rotating the screw 80 in the direction in which the screw 80 moves away from the mold release axis 70, There is an effect that can be stretched.

Since the lock nut 86 coupled to the fourth male screw portion 84 formed in the screw 80 is provided, it is possible to prevent the screw 80 from being loosened.

The end cap 30 can be guided along the screw 80 when the screw 80 is rotated because the end cap 30 can be linearly guided by the slide tube 35 and the guide shaft 74 in the axial direction. There is an effect that it can be prevented from returning.

Since the cover 100 covering the inside of the end cap 30 is provided, contamination of various components located inside and inside the end cap 30 can be greatly reduced.

When the oilless washer 75 is provided between the sleeve 34 and the flange 82, there is an effect that the rotation of the screw 80 can be made smooth by reducing the frictional resistance when the screw 80 is rotated.

The annular grooves 27 and 37 and the annular protrusions 52 are formed on the pressing surfaces of the first filter fixing portion 22 and the first ring nut 50 and the second filter fixing portion 32 and the second ring nut 60, The pressing portion of the screen filter 40 is pressed in a V shape to prevent the screen filter 40 from coming off and the screen filter 40 can be tensioned with a stronger force There is an effect.

The piston rod 91 and the differential shaft 70 are vibrated in the axial direction by switching the direction of the pressure fluid supplied to the cylinder 90 by the directional valve 92 so that the vibration of the screen filter 40 The foreign matter 41 attached to the screen filter 40 can be removed quickly and effectively.

Further, since the controller 95 can quickly switch the directional control valve 92 at a constant cycle, it is possible to automate the operation of removing the foreign substances adhered to the screen filter 40.

1 is an exploded perspective view
Fig. 2 is an exploded perspective view of Fig. 1,
Figure 3 is a perspective view of an end cap according to the present invention;
4 is a partial cross-sectional perspective view showing a filter housing and a cylinder according to the present invention.
Figure 5 is a cross-
6 is an enlarged cross-sectional view showing a screw connection portion according to the present invention
FIG. 7 is a cross-sectional view showing the foreign matter adhered to the screen filter according to the present invention,
8 is a perspective view
Figure 9 is a block diagram

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 9, the present invention is characterized in that a suction pipe 21 is formed at one center, a first filter fixing part 22 in the form of a trumpet tube is formed at the other end, And a filter housing 20 on which a filter 23 is formed.

The connecting portion of the filter housing 20 connected to the suction pipe 21 may be formed in a trumpet shape having an inner diameter narrower toward the suction pipe 21 and connected to a pump To form thread threads.

The present invention relates to an end cap which is concentric with a filter housing (20) and faces a distance, has a second filter fixing part (32) in the form of a trumpet tube at one end and a second male threaded part (33) (30).

The other side of the end cap 30 is closed in the shape of a disk and the opposite side thereof can be formed in an open form. In particular, the first filter fixing part 22 and the second filter fixing part 32 are symmetrical As shown in FIG.

The present invention relates to a flexible screen filter (40) installed between a filter housing (20) and an end cap (30); A first ring nut (50) coupled to the first male threaded portion (23) and pressing one end of the screen filter (40) toward the outer peripheral surface of the first filter fixing portion (22) and fixing the same; And a second ring nut 60 which is coupled to the second male screw portion 33 and presses and fixes the other end of the screen filter 40 toward the outer peripheral surface of the second filter fixing portion 32.

The screen filter 40 can be formed by, for example, sewing a net of fibers woven in the form of a net using synthetic fibers into a cylindrical shape.

5, the first ring nut 50 and the second ring nut 60 are formed so as to correspond to the first filter fixing portion 22 and the second filter fixing portion 32 formed in the shape of a trunk tube, 1 ring nut 50 and the second ring nut 60 are formed to have inclined surfaces.

A plurality of engaging grooves 54 and 64 are formed along the outer edge of the first ring nut 50 and the second ring nut 60 and are fastened with a fastening tool such as a hook spanner Turn the nut (50) and the second ring nut (60) so that they can be tightened or loosened.

The present invention is characterized in that it comprises an aliphatic shaft (70) having one end connected to the center of the filter housing (20) and a screw hole (71) formed at the center of the other end; And a sleeve 34 formed at the center of the end cap 30.

The mold shaft 70 can be formed of a metal hexagonal rod having a regular hexagonal cross section, for example, and the sleeve 34 can be formed integrally with the end cap 30. [

The present invention is characterized in that a third water portion 81 coupled to the screw hole 71 is formed at one end and the end cap 30 is pulled in a direction away from the filter housing 20 by rotation to be applied to the screen filter 40 And a screw 80 for applying a tensile force.

When the screw 80 is rotated clockwise or counterclockwise, the third water portion 81 formed in the screw 80 enters or exits the screw hole 71 to relax or tension the screen filter 40 do.

A flange (82) formed on the outer circumferential surface of the screw (80) and engaged with an end of the sleeve (34); A rotation part 85 formed at the other end of the screw 80 and inserted into the sleeve 34 and having a fourth male threaded part 84 formed with a tool engagement groove 83; And a lock nut 86 coupled to the fourth male screw portion 84.

Oil friction between the sleeve 34 and the flange 82 may be reduced by providing an oil-free washer 75 formed of Teflon or oil impregnated into the sintered alloy to reduce the frictional resistance that may occur when the screw 80 is rotated have.

The tool engagement groove 83 formed in the fourth male screw portion 84 may be formed by, for example, a hexagonal groove. In this case, a fastening tool such as an Allen wrench or a hexagonal screwdriver is inserted into the tool engagement groove 83, (80) can be rotated.

The rotation part 85 is loosely inserted into the sleeve 34 and rotates within the sleeve 34 when the screw 80 is rotated so as to support the end cap 30 at the same time.

The lock nut 86 is for tightening when the screen filter 40 is tensioned by the screw 80 so as to prevent the screw 80 from being released naturally and it is possible to replace the screen filter 40 or rotate the screw 80 The lock nut 86 is loosened.

The third water portion 81 and the flange 82, the rotating portion 85 and the fourth water receiving portion 84 are integrally formed with the screw 80 and the stainless steel round bar is cut to form the screw 80 .

The present invention comprises an extension pipe (72) installed at the other end of the release shaft (70); A shaft fixing plate 73 installed at an end of the extension pipe 72; A guide shaft 74 installed on the shaft fixing plate 73 so as to be parallel to the mold release shaft 70; And a slide tube 35 formed inside the end cap 30 and coupled to the guide shaft 74 to prevent rotation of the end cap 30 while moving in the axial direction.

A circular engagement portion 76 having a circular outer circumferential surface may be formed at the other end of the release shaft 70 in order to install the extension pipe 72 on the release shaft 70, The end of the extension tube 72 and the circular engagement portion 76 can be welded to each other and joined together.

One end of the guide shaft 74 may be inserted into a hole (not shown) formed in the shaft fixing plate 73 and then welded to each other so that the guide shaft 74 and the shaft fixing plate 73 are joined to each other.

When the end cap 30 is moved in the axial direction by the rotation of the screw 80, the slide tube 35 moves away from or approaches the guide shaft 74 and linearly guides the end cap 30 in the axial direction, Thereby preventing the end cap 30 from rotating along the screw 80.

The present invention comprises a radial rib (24) radially formed from an inner circumferential surface of a filter housing (20) toward a center; And a guide bush 25 formed at the center side end of the radial rib 24 and positioned at the center of the filter housing 20 and having an eyelet 26 for axially guiding the differential shaft 70.

The release hole 26 formed in the guide bush 25 is formed as a hexagonal hole when the release shaft 70 has a hexagonal cross section.

The present invention relates to a cylinder (90) installed in a guide bush (25); A piston rod 91 that is drawn out of the cylinder 90 and connected to the differential shaft 70 and oscillates in the axial direction together with the differential shaft 70; A direction switching valve 92 connected to the cylinder 90; And a valve drive unit 93 for driving the directional control valve 92.

Since the cylinder 90 is located inside the filter housing 20, the hose draw-out opening 28 is provided in the filter housing 20 in order to draw the hose 96 connected to the cylinder 90 out of the filter housing 20 .

A coupling hole 77 is formed at the center of the release shaft 70 to connect the piston rod 91 to the release shaft 70 and then the piston rod 91 is inserted into the coupling hole 77, 70 and the piston rod 91 by inserting the spring pin 98 into the pin hole 70h and 91h formed in the direction perpendicular to the shaft.

9, the valve driving unit 93 may include a relay driving circuit (not shown in detail) driven by a low voltage, for example, ≪ / RTI >

A bolt 97 for fixing the cylinder 90 is coupled to the tapped hole 25t formed in the guide bush 25 to connect the cylinder 90 to the guide bush 25.

The present invention is directed to a controller that outputs a driving signal to the valve driving unit 93 to control the direction of the flow path from the pressure source 94 to the cylinder 90 so as to shake the foreign matter 41 attached to the screen filter 40 (95).

The controller 95 is constituted of a program memory as a nonvolatile memory (ROM), a data memory as a volatile memory (RAM), a clock generating circuit, an input / output port, a timer and an arithmetic unit using a microcontroller .

The pressure source 94 may be pneumatic or hydraulic, in which case the cylinder 90 is comprised of a pneumatic cylinder or hydraulic cylinder.

When a driving signal is applied from the controller 95 to the valve driving portion 93 when removing the foreign matter 41 adhered to the screen filter 40, the valve driving portion 93 is positioned at both ends of the direction switching valve 92 The two solenoids are driven alternately at regular intervals.

At this time, the direction of the flow path from the pressure source 94 to the cylinder 90 is periodically switched so that the piston rod 91 repeats the forward and backward movements, and the differential shaft 70, which is connected to the piston rod 91, The vibration is transmitted to the end cap 30 and the screen filter 40 while vibrating in the axial direction to shake off the foreign matter 41.

A cover (100) for covering an inside of an end cap (30); A hollow boss (36) formed from the end cap (30) toward the cover (100); A fixing pin 102 formed on the cover 100 and inserted into the center of the hollow boss 36; And an annular rib 104 formed along the rim of the cover 100 and hung on the inner edge of the end cap 30.

The cover 100 is for minimizing the inflow of the foreign matter 41 into the end cap 30. The cover 100 can press the fixing pin 102 into the hollow boss 36, A cylindrical portion 38 that is fitted to the outer circumferential surface of the circular engagement portion 76 formed on the release shaft 70 can be formed.

The present invention comprises annular grooves (27) (37) formed on the outer peripheral surfaces of the first filter fixing portion (22) and the second filter fixing portion (32); And annular protrusions 52 and 62 formed on the pressing surfaces of the first ring nut 50 and the second ring nut 60 respectively corresponding to the annular grooves 27 and 37.

The annular grooves 27 and 37 and the annular protrusions 52 and 62 are formed by the first filter fixing portion 22 and the first ring nut 50 and the second filter fixing portion 32 and the second ring nut 60 , The pressing portion of the screen filter 40 is pressed again in a V-shape so as to prevent the screen filter 40 from coming off and to tense the screen filter 40 with a stronger force .

Hereinafter, the operation according to the present invention will be described in detail with reference to the accompanying drawings.

The process of installing the screen filter 40 on the filter housing 20 and the end cap 30 as shown in FIGS. 1 to 9 includes the first filter fixing portion 22 formed on the filter housing 20, And the first ring nut 50 is coupled to the first male threaded portion 23 formed on the filter housing 20 so that one end of the screen filter 40 is connected to the filter And is fixed to the housing 20.

The second filter fixing portion 32 formed on the end cap 30 is wrapped around the other side of the screen filter 40 and then the second ring nut 60 is inserted into the second male screw portion 33, the other end of the screen filter 40 is fixed to the end cap 30.

At this time, the annular grooves 27 and 37 formed in the first filter fixing portion 22 and the second filter fixing portion 32 and the annular protrusions 52 formed in the first ring nut 50 and the second ring nut 60 (62) presses the pressing portion of the screen filter (40) in a V shape, so that the screen filter (40) has stronger binding force.

The screen filter 40 is stretched in a state in which both ends of the screen filter 40 are fixed to the filter housing 20 and the end cap 30 by the first ring nut 50 and the second ring nut 60, The lock nut 86 coupled to the fourth male screw portion 84 is removed and the tool engagement groove 83 formed in the fourth male screw portion 84 is fastened with a fastening tool such as an Allen wrench or a hexagonal screwdriver The third water nip portion 81 formed on the screw 80 is pulled out from the screw hole 71 formed in the dispensing shaft 70. When the screw 80 is rotated in the direction in which the screw 80 is separated from the dispensing shaft 70, (80) moves away from the mold release axis (70).

At this time, the end cap 30 coupled to the rotation part 85 formed on the screw 80 is moved in the axial direction together with the screw 80, so that the screen filter 40 is tensioned.

The slide tube 35 formed on the end cap 30 is moved in the direction away from the guide shaft 74 fixed to the release shaft 70 by the extension pipe 72 and the shaft fixing plate 73, 30 are prevented from rotating along the screw 80.

If the screen filter 40 is tightly tensioned and then the lock nut 86 is fastened tightly to the fourth male threaded portion 84, the rotation of the screw 80 can be prevented and the screen filter 40 can be loosened .

When a negative pressure is generated in the filter housing 20 by a pump (not shown) connected to the suction pipe 21 formed in the filter housing 20, the wastewater located outside the screen filter 40 is discharged to the screen filter 40, and is discharged through the suction pipe 21. At this time, foreign matter 41 remaining in the wastewater is separated from the screen filter 40 by being filtered.

When the screen filter 40 is used for a long period of time, the foreign matter 41 is applied to the screen filter 40 to gradually clog the mesh of the screen filter 40. The foreign matter 41 attached to the screen filter 40 is removed 9, when a drive signal is applied from the controller 95 to the valve driving unit 93, the valve driving unit 93 drives the two solenoids positioned at both ends of the direction switching valve 92 at a predetermined cycle And is driven alternately.

At this time, the direction of the flow path from the pressure source 94 to the cylinder 90 is periodically switched so that the piston rod 91 repeats the forward and backward movements rapidly, and the differential shaft 70 Vibrates in the axial direction and transmits the vibration to the screen filter 40 through the end cap 30 to blow off the foreign matter 41. [

In this process, the release shaft 70 moves in the axial direction while being guided by the release hole 26 formed in the guide bush 25.

20: filter housing 21: suction pipe
22: first filter fixing part 23: first water screw
24: Radial rib 25: Guide bush
25t: tap hole 26: release hole
27, 37: annular groove 28: hose withdrawal hole
30: end cap 32: second filter fixing section
33: second male threaded portion 34: sleeve
35: slide tube 36: hollow boss
38: Cylinder part 40: Screen filter
41: foreign substance 50: first ring nut
60: second ring nut 52, 62: annular projection
54, 64: Retaining groove 70:
70h, 91h: pin hole 71: screw hole
72: extension pipe 73: shaft fixing plate
74: guide shaft 75: oilless washer
76: circular coupling portion 77: coupling hole
80: screw 81: third number Nauv
82: flange 83: tool engaging groove
84: fourth male threaded portion 85:
86: Lock nut 90: Cylinder
91: Piston rod 92: Directional switching valve
93: valve drive part 94: pressure source
95: Controller 96: Hose
97: bolt 98: spring pin
100: Cover 102: Fixing pin
104: annular rib

Claims (5)

delete A filter housing 20 having a suction pipe 21 at one center, a first filter fixing part 22 in the form of a trumpet tube at the other end, and a first male screw part 23 on the outer circumference;
An end cap 30 (see FIG. 1), which is concentric with the filter housing 20 at a distance and has a second filter fixing part 32 in the form of a trunk tube at one end and a second male screw part 33 on the outer circumferential surface, );
A flexible screen filter (40) installed between the filter housing (20) and the end cap (30);
A first ring nut (50) coupled to the first male threaded portion (23) and pressing one end of the screen filter (40) toward the outer peripheral surface of the first filter fixing portion (22)
A second ring nut (60) coupled to the second male threaded portion (33) for pressing and fixing the other end of the screen filter (40) toward the outer peripheral surface of the second filter fixing portion (32);
An annular shaft 70 having one end connected to the center of the filter housing 20 and a screw hole 71 formed at the center of the other end;
A sleeve 34 formed at the center of the end cap 30;
The end portion of the end cap 30 is pulled in a direction away from the filter housing 20 by the rotation so that the screen filter 40 is rotated by the rotation of the end portion of the end cap 30, A screw 80 for applying a tensile force to the screw 80;
A flange 82 formed on an outer circumferential surface of the screw 80 and hooked to an end of the sleeve 34;
A rotation part 85 formed at the other end of the screw 80 and inserted into the sleeve 34 and having a fourth male threaded part 84 formed with a tool engagement groove 83;
A lock nut 86 coupled to the fourth male threaded portion 84;
The screen device comprising:

An extension pipe (72) provided at the other end of the release shaft (70);
A shaft fixing plate 73 provided at an end of the extension pipe 72;
A guide shaft 74 installed on the shaft fixing plate 73 so as to be parallel to the mold release shaft 70;
A slide tube 35 formed inside the end cap 30 and coupled to the guide shaft 74 to prevent rotation of the end cap 30 while moving in the axial direction;
Wherein the screen device for treating wastewater comprises: A filter housing 20 having a suction pipe 21 at one center, a first filter fixing part 22 in the form of a trumpet tube at the other end, and a first male screw part 23 on the outer circumference;
An end cap 30 (see FIG. 1), which is concentric with the filter housing 20 at a distance and has a second filter fixing part 32 in the form of a trunk tube at one end and a second male screw part 33 on the outer circumferential surface, );
A flexible screen filter (40) installed between the filter housing (20) and the end cap (30);
A first ring nut (50) coupled to the first male threaded portion (23) and pressing one end of the screen filter (40) toward the outer peripheral surface of the first filter fixing portion (22)
A second ring nut (60) coupled to the second male threaded portion (33) for pressing and fixing the other end of the screen filter (40) toward the outer peripheral surface of the second filter fixing portion (32);
An annular shaft 70 having one end connected to the center of the filter housing 20 and a screw hole 71 formed at the center of the other end;
A sleeve 34 formed at the center of the end cap 30;
The end portion of the end cap 30 is pulled in a direction away from the filter housing 20 by the rotation so that the screen filter 40 is rotated by the rotation of the end portion of the end cap 30, A screw 80 for applying a tensile force to the screw 80;
A flange 82 formed on an outer circumferential surface of the screw 80 and hooked to an end of the sleeve 34;
A rotation part 85 formed at the other end of the screw 80 and inserted into the sleeve 34 and having a fourth male threaded part 84 formed with a tool engagement groove 83;
A lock nut 86 coupled to the fourth male threaded portion 84;
The screen device comprising:

A radiation rib (24) formed radially from the inner circumferential surface of the filter housing (20) toward the center;
A guide bush 25 formed at the center side end of the radial rib 24 and positioned at the center of the filter housing 20 and having an eyelet 26 for axially guiding the deforming shaft 70;
A cylinder 90 installed in the guide bush 25;
A piston rod 91 which is drawn out from the cylinder 90 and connected to the deforming shaft 70 and oscillates in an axial direction together with the deforming shaft 70;
A direction switching valve 92 connected to the cylinder 90;
A valve driving unit 93 for driving the direction switching valve 92;
A controller for outputting a driving signal to the valve driving unit 93 to switch the direction of the flow path from the pressure source 94 to the cylinder 90 so as to shake the foreign substances 41 attached to the screen filter 40 (95);
And a control unit for controlling the operation of the screen device. delete delete

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