JP6288630B1 - Screw press - Google Patents

Abstract

Provided is a screw press that can suppress and prevent the accumulation of solid contents on a filtration surface and can be continuously operated for a long time. The screw press of the present invention includes a rotating drum 11 having a cylindrical filtration surface 11A and a screw 12 having screw blades 12B provided along the axis in the rotating drum 11 and is attached to the filtration surface 11A. A shoe mechanism 30 for removing the solid content to be removed is provided along the outer peripheral edge of the screw blade 12B. And an elastic member 33 that imparts elasticity to the resin shoe 31 in the storage body 32, and a pop-out prevention member (screw member) 34 that prevents the resin shoe 31 from jumping out of the storage body 32.

Description

  The present invention relates to a screw press that squeezes an object to be treated such as sludge and separates it into solid and liquid, and more particularly relates to a screw press provided with a shoe mechanism that prevents accumulation of solid content after pressing on a rotating drum.

  As this type of conventional screw press, for example, the one shown in FIG. 5 is known. FIG. 5 schematically shows the screw press described in Patent Document 1. As shown in FIG. 5, the conventional screw press M includes a rotating drum 1 having a cylindrical filtration surface 1 </ b> A, a screw shaft 2 </ b> A penetrating along the axis of the rotating drum 1, and a spiral shape on the outer peripheral surface of the screw shaft 2 </ b> A. And a screw 2 having a screw blade 2B formed on the surface, and is configured to squeeze the object to be treated (for example, sludge) and separate it into a separated liquid and a solid content.

  The rotary drum 1 includes a left end surface 1B that closes one end (the left end in the figure) of the filtration surface 1A, a diameter-enlarged portion 1C that is continuously connected to the right end of the filtration surface 1A with a diameter larger than the filtration surface 1A, and a diameter-enlarged portion 1C And a right end surface 1D for closing the right end. The screw shaft 2A has a left end passing through the center of the left end face 1B of the rotary drum 1 and a right end passing through the center of the right end face 1D. Further, the screw shaft 2A has a hollow portion 2C formed at the left end portion as shown in FIG. 5 and an opening 2D that opens from the hollow portion 2C in the rotary drum 1, from the left end of the screw shaft 2A. Sludge is supplied into the hollow portion 2C as indicated by an arrow A, and flows into the rotating drum 1 from the opening 2D of the screw shaft 2A in the rotating drum 1.

  The screw shaft 2A is formed to have a taper-shaped portion that gradually increases in diameter from the vicinity of the left end surface 1B of the rotating drum 1 to the right end of the filtration surface 1A, and the same diameter as the maximum diameter of the taper-shaped portion in the expanded-diameter portion 1C. It has a straight body. The screw blade 2B is formed in a tapered portion, and a slit is formed between the outer periphery of the screw blade 2B and the filtration surface. The screw blade 2B gradually decreases in spiral distance from the left side to the right side of the filtration surface 1A, and increases the squeezing force toward the enlarged diameter portion 1C.

  First and second bearings 3A and 3B are respectively provided at both left and right ends of the screw shaft 2A, and the screw shaft 2A is rotatably supported by the first and second bearings 3A and 3B. A third bearing 4A is provided between the center hole of the left end surface 1B of the rotating drum 1 and the screw shaft 2A. A cylindrical body 1E that covers the screw shaft 2A is connected to the central portion of the right end surface 1D of the rotary drum 1, and a fourth bearing 4B is provided between the cylindrical body 1E and the screw shaft 2A. The second bearing 3 </ b> B supports the screw shaft 2 </ b> A via a thin portion that extends from the cylindrical body 1 </ b> E of the rotary drum 1.

  A first sprocket 5A is attached to the left end portion of the screw shaft 2A, and a second sprocket 5B is attached to the right end portion of the thin portion of the cylindrical body 1E of the rotary drum 1, and these sprockets 5A, The screw 2 and the rotating drum 1 rotate through 5B. The rotary drum 1 rotates differentially at a different rotational speed from the screw 2.

Further, between the right end of the filtration surface 1A of the rotary drum 1 and the left end of the enlarged diameter portion 1C, there is a straight body portion 1F having the same diameter as the filtration surface 1A, and the right end of the straight body portion 1F and the straight body of the screw shaft 2A. The ring-shaped gap in the part serves as a solid content outlet after the sludge pressing treatment. Further, since the solid content from the discharge port is discharged to the outside via the enlarged diameter portion 1C, the enlarged diameter portion 1C will be described as the discharge portion 1C below.

A presser 6A having a ring shape is provided in the discharge portion 1C of the rotary drum 1, and the discharge port is closed by the presser 6A to apply a back pressure to the solid content. The presser 6A is formed in a ring shape having a tapered surface that closes the discharge port, and the straight body portion of the screw shaft 2A passes through the central hole. A presser pressing plate 6B having a ring shape is provided outside the discharge portion 1C in parallel with the presser 6A at a predetermined interval. The cylindrical body 1E of the rotary drum 1 passes through the center hole of the presser pressing plate 6B, and the presser pressing plate 6B slides in the left-right direction according to the cylindrical body 1E. The presser pressing plate 6B is connected to the presser 6A through a plurality of rods 6C. The presser pressing plate 6B reciprocates the cylinder 1E in the left-right direction via the drive mechanism 6D. The drive mechanism 6D includes, for example, an air cylinder 6D ₁ that operates with pressurized air, a sliding member 6D ₂ that sandwiches the outer peripheral edge of the presser pressing plate 6B, and a support 6D ₃ that supports the sliding member 6D _2. The air cylinder 6D ₁ is configured to operate the presser pressing plate 6B by expanding and contracting the cylinder rod 6D ₄ with pressurized air.

When closing the discharge port by the presser 6A, the presser pressing plate 6B is moved from the solid line position to the position indicated by the two-dot chain line in the left direction via the drive mechanism 6D, and the discharge port is closed by the presser 6A. The back pressure is applied to the solid content conveyed by the screw 2. This back pressure can be appropriately set by a pneumatic air cylinder 6D ₁ driving mechanism 6D. While the rotary drum 1 is repressor 6A with the rotating reciprocates according tubular body 1E, the sliding member 6D ₂ slides on the outer periphery of the presser push plate 6B during rotation. When the pressure from the solid content conveyed by the screw 2 overcomes the back pressure from the presser 6A, the presser 6A moves to the right from the position indicated by the two-dot chain line, gradually opens the discharge port, and solids from the discharge unit 1C. The minute is discharged to the outside as indicated by arrow B.

In FIG. 5, the guide mechanism. 6E to smoothly straight sliding member 6D _2, 7 housing for accommodating the rotary drum 1, etc., 8 water collecting portion made of the inclined surface formed on the lower rotary drum 1 , 9 is a drainage part formed in the central part of the water collection part 8. Further, a cleaning device (not shown) is provided over the entire length of the filtration surface 1A in the gap above the filtration surface 1A of the rotary drum 1 and the housing 7, and when the rotary drum 1 is rotating, the filtration surface 1A is provided. Wash.

  Thus, the rotating drum 1 and the screw 2 of the screw press M rotate to separate the sludge into solid and liquid, and the solid content is conveyed to the discharge port while squeezing the solid gradually and strongly, and the solid content reaches the presser 6A. When the pressing force overcomes the back pressure, the presser 6A opens the discharge port to discharge the solid content to the discharge unit 1C, and discharges the discharge unit 1C to the outside as indicated by the arrow B. The separated water by pressing is collected from the filtration surface 1A to the water collection unit 8 and discharged from the drainage unit 9 to the outside.

Japanese Patent No. 4373732

  However, when the conventional screw press M is operated and the sludge squeezing process is continued for a long time, the filtration surface 1A is clogged with solids, and eventually a deposited layer is formed on the inner surface of the filtration surface 1A, making it difficult to filter the separated liquid. There was a possibility that the subsequent sludge could not be squeezed. For this reason, the screw press M must be stopped in a relatively short time, and the inside of the rotary drum 1 must be cleaned to remove the deposited layer.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a screw press that can suppress and prevent the accumulation of solid content on the filtration surface and can be continuously operated for a long time. .

According to a first aspect of the present invention, there is provided a screw press comprising: a rotary drum having a cylindrical filtration surface; and a screw having screw blades provided along an axial center in the rotary drum. And a screw press that squeezes the workpiece to be supplied into the rotating drum via both of them during rotation of the screw and solid-liquid separates into a solid content and a separated liquid, and adheres to the filtration surface. A shoe mechanism for removing the minute portion is provided along the outer peripheral edge of the screw blade, and the shoe mechanism includes a shoe that elastically slides on the filtration surface, a storage body that stores the shoe, and a storage body that stores the shoe. possess an elastic member for a shoe resiliently sliding contact with the filtering surface, and the preventing member popping out to prevent jumping out from the housing body of the shoe, and the pop-out preventing member, Is attached to the serial storage body is characterized in that it is configured the shoe as a screw member for swingably supported by the housing body.

  The screw press according to claim 2 of the present invention is characterized in that, in the invention according to claim 1, the shoe mechanism is provided over the entire outer peripheral edge of the screw blade. Is.

  According to a third aspect of the present invention, in the screw press according to the first or second aspect, the shoe mechanism has a plurality of the shoes, and each shoe is made of an arc-shaped resin. It is characterized by being formed.

  The screw press according to claim 4 of the present invention is the invention according to any one of claims 1 to 3, wherein the shoe mechanism includes a plurality of elastic members, and the plurality of elastic members. The member includes at least one of an elastic member formed of a spring member or an elastic body.

The screw press according to claim 5 of the present invention is the invention according to any one of claims 1 to 4, wherein the shoe has a hole into which the screw member is loosely fitted. It is what.

According to the present invention, it is possible to suppress and prevent the accumulation of solid content on the filtration surface, to continuously operate for a long time, and to prevent the shoe mechanism from popping out when the shoe of the shoe mechanism is damaged after a long period of use. it is possible to provide a screw press that can be easily replaced the shoe via a screw member used as a member.

It is sectional drawing which shows one Embodiment of the screw press of this invention over the full length. It is sectional drawing which shows the presser drive mechanism of the screw press shown in FIG. (A), (b) is a figure which expands and shows the shoe mechanism shown in FIG. 1, respectively, (a) is a front view which shows the principal part. (B) is an axial sectional view showing an enlarged main part of the screw. (A)-(c) is a figure which expands and shows the shoe mechanism which concerns on other embodiment of this invention, respectively, (a) is a front view which shows the principal part. (B) is sectional drawing of the BB line direction of (a), (c) is sectional drawing of the CC line direction of (a). It is a schematic diagram which shows the conventional screw press.

Hereinafter, the present invention will be described based on the embodiment shown in FIGS.
The screw press 10 of the present embodiment has a first end surface (hereinafter referred to as “left end surface”) 11B formed at the left end of a cylindrical filtration surface 11A, for example, as shown in FIG. The rotating drum 11 having a second end surface (hereinafter referred to as “right end surface”) 11D at the right end of the enlarged diameter portion 11C extending from the right end of the surface 11A and the rotating drum 11 share an axis and rotate. A screw shaft 12A protruding outward from both end faces 11B and 11D of the drum 11 and a screw 12 having screw blades 12B formed in a spiral shape on the peripheral surface of the screw shaft 12A. In cooperation, the object to be treated (for example, sludge) is squeezed into a solid and a separated liquid, and the separated liquid is discharged from the filtration surface 11A while the solid is squeezed by the screw blade 12B. And it is configured to convey to the discharge port of the predicate.

  As shown in FIG. 1, first and second bearings 13A and 13B are respectively provided at both ends of the screw shaft 12A, and the screw shaft 12A, that is, the screw 12 can be rotated freely by these bearings 13A and 13B. I support. The first and second bearings 13A and 13B are both fixed to the supports S1 and S2. The second bearing 13B is connected to an adjacent rotary joint as will be described later. Third and fourth bearings 14A and 14B interposed between the screw shafts 12A are provided in the center holes of both end surfaces 11B and 11D of the rotary drum 11, respectively. The bearings 14A and 14B rotate on the screw shafts 12A. A drum 11 is rotatably supported.

  As shown in FIG. 1, a cylindrical body 11E surrounding the fourth bearing 14B is connected to the outer surface of the right end surface 11D of the rotary drum 11, and a sprocket 15A is provided at the right end of the cylindrical body 11E. A first drive device 16A is connected to the sprocket 15A via an endless chain 17A, and the first drive device 16A rotates the rotary drum 11 via the chain 17A and the sprocket 15A. A sprocket 15B is provided at the right end of the screw shaft 12A, and a second drive device 16B is connected to the sprocket 15B via an endless chain 17B. The second drive device 16B is connected to the chain 17B and the sprocket 15B. The screw 12 is rotated at a rotational speed faster than that of the rotary drum 11.

Further, the screw shaft 12A has a tapered portion 12A ₁ gradually enlarged from the vicinity of the left end surface 11B to the vicinity of the right side of the enlarged diameter portion 11C in the filtering surface 11A of the rotating drum 11 as shown in FIG. 1, a tapered shaped portion 12A straight body section 12A ₂ which extends into the enlarged diameter portion 11C from the right edge of _the same in the same size, the has. Accordingly, the first, second, third, and fourth bearings 13A, 13B, 14A, and 14B are all provided at both ends of the screw shaft 12, and the rotary drum 11 is rotatably supported by the screw shaft 12. Has been. Screw blade 12B is formed in a spiral shape tapered portion 12A _1, helix spacing increases toward the discharge section 11C is narrower. Further, a narrow gap is formed between the outer peripheral surface of the screw blade 12B and the inner peripheral surface of the filtration surface 11A, and the size control of the gap between the outer periphery of the screw blade 12B and the filtration surface 11A is relatively rough. Easy to manage dimensions.

  Further, the left end portion of the screw shaft 12A passing through the left end surface 11B of the rotary drum 11 is formed as a hollow shaft. The hollow shaft is formed with an opening 12 </ b> C located near the inside of the left end surface 11 </ b> B of the rotary drum 11. The sludge is supplied from the left end opening of the hollow shaft and flows into the rotary drum 11 from the opening 12C.

Between the straight body portion 12A ₂ of the right end of the filtration surface 11A of the rotary drum 11 and the screw shaft 12A has a ring-shaped gap, solids are discharged through the gap. Hereinafter, this ring-shaped gap will be described as a discharge port. Further, the solid content discharged from the discharge port is discharged to the outside as will be described later via the enlarged diameter portion 11C. Therefore, hereinafter, the enlarged diameter portion 11C will be described as the discharge portion 11C.

  A presser 18 that opens and closes a solid content discharge port is provided in the discharge unit 11C, and the presser 18 is configured to apply a back pressure to the solid content at the discharge port. When the extrusion pressure of the solid content overcomes the predetermined back pressure from the presser 18 at the discharge port, the presser 18 moves from the two-dot chain line position to the solid line position on the right end surface 11D side in the discharge part 11C, and gradually exits the outlet. Open and discharge the solid content to the discharge part 11C.

Presser 18, as shown in FIGS. 1 and 2, has a tapered surface that closes the outlet from entering the distal end side in a ring-shaped outlet, the central hole straight body 12A ₂ of the screw shaft 12A is through and it is configured to move the cylindrical body portion 12A ₂ in the lateral direction. The presser 18 is configured to apply a predetermined back pressure to the solid content at the discharge port and to open and close the discharge port by a driving mechanism 19 provided outside the rotary drum 11.

As shown in FIGS. 1 and 2, the drive mechanism 19 includes, for example, two cylinder mechanisms (for example, an air cylinder) 19A provided at positions 180 ° apart from each other on the outer side of the right end surface 11D of the rotary drum 11, and these A rotary joint 19C connected to the air cylinder 19A via the pipes 19B and 19B, and an air source 19D connected to the rotary joint 19C via the pipe 19B. Then, each of the distal end portion of the cylinder rod 19A ₁ of the two air cylinders 19A repressor 18 is connected. 1 and 2, the presser 18 has a plurality of guide rods 19E arranged at equal intervals in the circumferential direction between the right end surface 11D and the opposing surface in the discharge portion 11C of the rotary drum 11. And is configured to smoothly move and guide in the left-right direction via these guide rods 19E. Only one air cylinder 19A is shown in FIGS. In the present embodiment, a double-acting air cylinder is used as the air cylinder 19A. In the present invention, a single-acting air cylinder can also be used.

Therefore, the drive mechanism 19, elongation cylinder rod 19A ₁ is supplied pressurized air to the air cylinder 19A from the air source 19D via the rotary joint 19C, the outlet is moved toward the presser 18 to the outlet of the solids Close. Under the present circumstances, the back pressure given to solid content can be adjusted by setting suitably the magnitude | size of the pressure of pressurized air according to characteristics, such as a kind of sludge. If the pressure of the pressurized air is set high, the back pressure from the presser 18 to the solid content increases and the moisture content of the solid content decreases. Conversely, if the pressure of the pressurized air is set low, the pressure from the presser 18 to the solid content The back pressure is reduced and the moisture content of the solid content is increased.

As shown in FIG. 2, the rotary joint 19C is interposed between the second bearing 13B and the fourth bearing 14B. The rotary joint 19C, as shown in the drawing, a cylindrical fixing portion 19C ₁ which is connected to the second bearing 13B, the tubular member 11E of the rotary drum 11 together with the inner surface of the fixing portion 19C ₁ is in sliding contact The cylindrical rotating part 19C _{2 connected,} and the bearing 19C ₃ interposed between both ends of the fixed part 19C ₁ and the rotating part 19C ₂ are provided, and the rotating part 19C ₂ is fixed together with the rotating drum 11 to the fixed part 19C _1. and it is configured to rotate while sliding to the fixed portion 19C ₁ mainly. Between the cylindrical fixing portion 19C ₁ and the screw shaft 12A has a slit, the screw shaft 12A is adapted to smoothly rotate through a slit between the fixed portion 19C _1.

Further, as shown in FIG. 2, the axially compressed air passage is formed two in a cylindrical fixing portion 19C _1, the outer peripheral surface of the fixing portion 19C ₁ 2 passageways respectively Two communicating annular grooves are formed. That is, the passage and the annular groove communicate with each other through the communication passage. Further, two first ports respectively communicating with two annular grooves with is formed in the radial direction to the rotating portion 19C _2, the fixing portion on the right end portion of the fixing portion 19C ₁ protruding from the rotation portion 19C ₂ Two second ports communicating with each of the two passages 19C ₁ are formed in the radial direction. Fittings 19C ₄ connected to a pipe 19B of the air source 19D shown in FIG. 1 in each of the two second ports of the right end portion of the fixing portion 19C ₁ (see FIG. 2) is mounted, the second rotating portion 19C ₂ one of the ports has two push-in joint 19C ₅ connected respectively attached to the two pipe 19B of the air cylinder 19A. At both ends of the air cylinder 19A Fittings 19A ₂ is attached to connect the two pipes 19B of the rotating portion 19C ₂ (see FIG. 1), pressurized air rotary joint from the air source 19D (see FIG. 1) The air is supplied to the opening / closing port of the air cylinder 19A via the second port 19C, the passage and the first port. The air cylinder 19A moves the presser 18 to close the discharge port, and applies back pressure to the solid content at the discharge port.

  By the way, the rotating drum 11 is housed in the housing 20 as shown in FIG. 1, and a cleaning device 21 is provided over the entire length of the filtration surface 11 </ b> A above the rotating drum 11 in the housing 20. The filtration surface 11A is washed by spraying washing water intermittently. A water collecting portion 22 having an inclined surface is formed below the rotating drum 11, and a drain pipe 23 is provided at the lower end of the water collecting portion 22. Therefore, the separated water and the wash water from the rotary drum 11 are collected in the water collection unit 22 and discharged from the drain pipe 23 to the outside.

  Thus, in the screw blade 12B of the screw 12 used in the present embodiment, for example, as shown in FIGS. 1 and 3 (a) and 3 (b), the solid content attached to the filtration surface 11A of the rotary drum 11 is removed. A shoe mechanism 30 is provided. As shown in FIGS. 3A and 3B, the shoe mechanism 30 includes a resin shoe 31 that elastically contacts the filtration surface 11A and an outer peripheral edge portion of the screw blade 12B so as to store the resin shoe 31. Storage body 32 fixed to the left side surface (the side surface facing the left end surface 11B, that is, the side surface on the sludge supply side of the screw 12), and the elasticity that imparts elasticity in the filtration surface 11A direction to the resin shoe 31 within the storage body 32. A member 33 (for example, a leaf spring 33A and / or elastic rubber 33B) and a pop-out preventing member (for example, a screw member) 34 for preventing the resin shoe 31 from popping out from the storage body 32 are provided. The elastic member 33 is urged to elastically contact the filtration surface 11A. Since the shoe mechanism 30 is provided on the surface of the screw blade 12B opposite to the sludge conveyance, the shoe mechanism 30 has little contact with the sludge and suppresses damage due to sludge. The elastic member 33 is composed of a leaf spring 33A and / or an elastic rubber 33B. In FIG. 3B, the elastic member 33 is shown as a spring for convenience.

  As assumed from FIG. 3A, the shoe mechanism 30 is preferably provided over the entire length of the left side surface of the outer peripheral edge of the screw blade 12B. Therefore, it is preferable that a plurality of resin shoes 31 are arranged over the entire length of the screw blade 12B with a gap therebetween. Each resin shoe 31 is given elasticity by an elastic member 33 interposed between the lower surface and the storage body 32.

  As shown in FIGS. 3A and 3B, the resin shoe 31 is formed in an arc shape matching the outer peripheral edge of the screw blade 12B, and is formed of a synthetic resin such as ultra high molecular weight polyethylene. The resin shoe 31 is preferably made of a material that does not easily wear. The resin shoe 31 is formed with radial holes 31A at two positions on the left and right sides, and these long holes 31A are formed in a size that allows the screw member 34 to be loosely fitted. Further, a notch 31B is formed at the lower part of both ends of the resin shoe 31, and a part of a plate spring 33A described later enters the notch 31B. Since the leaf spring 33A is integrated with the resin shoe 31 as described above, when the shoe mechanism 30 is attached to the screw blade 12B, the resin shoe 31 and the leaf spring 33A can be easily attached in an integrated state.

  As shown in FIG. 3B, the storage body 32 has a U-shaped cross section and is formed in accordance with the length of the outer peripheral edge of the screw blade 12B. A hole through which the screw member 34 that prevents the resin shoe 31 from jumping out from the inside of the housing body 32 is formed on the projecting surface of the housing body 32 from the screw blade 12B, and a screw hole corresponding to the hole is formed on the back side surface. Is formed. The storage body 32 may be formed continuously from the start end to the end of the screw blade 12B or may be divided into a plurality of pieces. In the present embodiment, the storage body 32 is formed of a metal such as stainless steel, and is fixed to the outer peripheral edge of the screw blade 12B by welding or the like. As shown in FIG. 3A, the plurality of resin shoes 31 are arranged in the storage body 32 with a gap therebetween, and the resin shoes 31 restrained in the storage body 32 via the screw members 34 are respectively arranged. It elastically contacts the filtration surface 11A via the elastic member 33, and smoothly slides up, down, left and right along the filtration surface 11A.

  The elastic member 33 is formed by the leaf spring 33A and / or the elastic rubber 33B as described above. As the elastic member 33, the leaf spring 33A alone may be used, but as shown in FIG. 3A, an elastic rubber 33B may be provided between the leaf springs 33A at a predetermined interval. The leaf spring 33A may be a coil spring as long as it is an elastic member.

  The leaf spring 33 </ b> A has a side surface waved into a mountain shape, and both ends thereof are bent upward from a mountain valley and formed in a substantially U shape, and one is used for one resin shoe 31. Yes. As shown in FIG. 3A, the leaf spring 33A has two peaks in contact with the lower surface of the resin shoe 31 and a central valley in contact with the bottom of the storage body 32 to elastically support the resin shoe 31. Yes. The U-shaped portions at both ends of the leaf spring 33A are inserted into the notches 31B at both ends of the resin shoe 31. The side shape of the leaf spring 33A changes according to the shape of the notch 31B of the resin shoe 31.

  As shown in FIG. 3A, the elastic rubber 33B is curved in an arc shape along the bottom surface of the resin shoe 31 in a state in which the elastic rubber 33B is mounted in the storage body 32, and a protrusion is formed at the center of the top surface. For example, one elastic rubber is used for two resin shoes 31. The elastic rubber 33 </ b> B has a protruding portion that is recessed into a recess formed by the notch portions 31 </ b> B of the left and right resin shoes 31, and an upper surface that is in contact with the bottom surfaces of the left and right resin shoes 31. That is, the resin shoe 31 supported by the elastic rubber 33B and the resin shoe 31 supported by the leaf spring 33A can use the same resin shoe.

  Since the resin shoe 31 is stored in the storage body 32 so as to be elastically slidably contacted with the filtering surface 11A via the elastic member 33 (plate spring 33A and / or elastic rubber 33B), the resin shoe 31 is slidably contacted with the filtering surface 11A. The top surface wears over time. The sliding contact surface with the filtration surface 11A of the resin shoe 31 becomes more familiar with the filtration surface 11A as the surface is worn, and the subsequent wear can be suppressed. If the resin shoe 31 is worn, the elastic member 33 gradually lifts it upward. If the bottom surface of the long hole of the resin shoe 31 comes into contact with the screw member 34, the elastic member 33 (the leaf spring 33A and / or the elastic rubber 33B) does not function thereafter. The resin shoe 31 is replaced.

Next, the operation of the screw press 10 of this embodiment will be described.
When the screw press 10 is started, the first and second drive devices 16A and 16B rotate the rotary drum 11 and the screw 12 differentially, and the presser 18 approaches the discharge port via the air cylinder 19A of the drive mechanism 19. Close the outlet with a predetermined pressure. During this time, as shown by an arrow A in FIG. 1, sludge is supplied from the hollow shaft of the screw shaft 12A and flows into the rotary drum 11 from the opening 12C of the hollow shaft. While the sludge is conveyed toward the discharge port through the screw blade 12B of the screw 12 in the rotary drum 11, the sludge is gradually squeezed strongly by the action of the screw blade 12B that gradually narrows and is solid-liquid into solid content and separated water. To be separated. The solid content after the solid-liquid separation is conveyed to the discharge port by the screw blade 12B, and the separated water is discharged from the filtration surface 11A to the water collecting unit 22.

  While the screw press 10 is being driven, solid content tends to adhere to the inner peripheral surface of the filtration surface 11A of the rotary drum 11, but the resin shoe 31 of the shoe mechanism 30 is elastically slidably in contact with the filtration surface 11A. Therefore, it is suppressed and prevented that the solid content is wiped off by the resin shoe 31 and the solid content adheres to and accumulates on the inner peripheral surface of the filtration surface 11A. Since the solid surface is removed and the filtration surface 11A is cleaned on the filtration surface 11A, the clogging of the filtration surface 11A is suppressed, the filtration area does not decrease over a long period of time, and the separation liquid smoothes the filtration surface 11A. Permeated and discharged to the water collecting unit 22. Therefore, the load on the cleaning device 21 that cleans the filtration surface 11A is reduced.

  When the screw press 10 performs solid-liquid separation while removing the solid content on the filtration surface 11A by the shoe mechanism 30, the solid content is gradually accumulated and conveyed in the rotary drum 11 to reach the presser 18 and press the presser 18. When the pressing force of the solid content gradually increases and overcomes the back pressure from the presser 18, the presser 18 moves backward by the pressing force of the solid content to open the discharge port. As a result, the solid content is discharged from the discharge port into the discharge portion 11C, and further discharged from the discharge portion to the outside as indicated by an arrow B in FIG. When the discharge of the solid content is completed, the drive mechanism 19 is driven, the presser 18 advances to the discharge port, and the discharge port is closed. And squeezing of sludge is continued.

  When the solid-liquid separation continues for a long time, the resin shoe 31 of the shoe mechanism 30 is gradually worn. However, since the resin shoe 31 is elastically lifted toward the filtration surface 11A by the elastic member 33, the resin shoe 31 still elastically slidably contacts the filtration surface 11A, and the contact surface thereof is worn by the abrasion of the resin shoe 31. However, the solid content can be removed more reliably from the filtration surface 11A, and the life of the resin shoe 31 itself can be extended. When the wear of the resin shoe 31 progresses, the resin shoe 31 is replaced as appropriate.

  As described above, according to the present embodiment, the shoe mechanism 30 is provided on the outer peripheral edge portion of the screw blade 12B, and the shoe mechanism 30 is configured by the resin shoe 31, the storage body 32, the elastic member 33, and the screw member 34. Therefore, even if the solid content generated by the solid-liquid separation of sludge adheres to and accumulates on the filtration surface 11A of the rotary drum 11, the solid content is removed from the filtration surface 11A by the shoe mechanism 30, and the solid content on the filtration surface 11A. Is suppressed and prevented, the stable permeability of the filtration surface 11A can be maintained for a long time, and the screw press 10 can be stably operated for a long time.

  Even if the resin shoe 31 is elastically slidably contacted with the filtration surface 11A and the upper end surface of the resin shoe 31 is worn, the resin shoe 31 is caused by the elastic member 33 (plate spring 33A and / or elastic rubber 33B). Since the resin shoe 31 is elastically lifted toward the filtration surface 11A at all times, the resin shoe 31 elastically slides on the filtration surface 11A to stably remove the solid content, and the solid content is surely deposited on the filtration surface 11A. Suppressed and prevented. If the wear of the resin shoe 31 progresses, the resin shoe 31 can be easily replaced by removing the screw member 34 in a timely manner. In addition, the shoe mechanism 30 is divided into a plurality of parts, so that even if the rotating drum 11 or the screw 12 is bent, the shoe mechanism 30 becomes familiar with the shape and can continue the sludge treatment as it is.

  Since the screw member 34 is loosely fitted in the long hole 31A of the resin shoe 31 and the resin shoe 31 freely swings back and forth around the screw member 34, a stable elasticity is maintained over the entire length of the resin shoe 31. Thus, the solid content is uniformly removed over a long time by slidingly contacting the filtration surface 11A.

  Moreover, (a)-(c) of FIG. 4 is a figure which shows the shoe mechanism which concerns on other embodiment of this invention, respectively. As shown in FIGS. 4A to 4C, the shoe mechanism 40 according to this embodiment includes a resin shoe 41 that elastically contacts the filtration surface 11A and a screw blade 12B that houses the resin shoe 41. A storage body 42 fixed to the left side surface of the outer peripheral edge portion, an elastic member (for example, a leaf spring) 43 formed in a mountain shape so as to give elasticity to the resin shoe 41 in the storage body 42, and the resin shoe 41 A screw member 44 that prevents the resin shoe 41 from jumping out from the storage body 42, and the resin shoe 41 is urged by the leaf spring 43 to elastically contact the filtration surface 11A.

  The resin shoe 41 is formed in an arc shape along the outer peripheral edge of the screw blade 12B, and two long holes 41A are formed at left and right spaced positions. These long holes 41 </ b> A are elongated in the radial direction of the screw blade 12 </ b> B in the same manner as shown in FIG. 3. As shown in FIG. 4A, a semicircular cutout 41B is formed in the center of the lower end of the resin shoe 41, and a crest of a mountain-shaped leaf spring 43 invades into the cutout 41B. Is in elastic contact with the innermost part of the notch 41B. Valleys are formed on the left and right of the top, and these valleys are in elastic contact with the bottom surface of the storage body 42. Therefore, the resin shoe 41 is always urged upward through the leaf spring 43 in the storage body 42, and is in elastic contact with the filtration surface 11A as shown in FIGS. 4 (b) and 4 (c).

  As shown in FIGS. 4A to 4C, the resin shoe 41 is loosely fitted to the screw member 44 through the long hole 41A in the storage body 42 in the same manner as the resin shoe 31 shown in FIG. The body 42 is restrained so as to be swingable. Since the resin shoe 41 is always urged upward by the leaf spring 43 in the storage body 42 in the same manner as the resin shoe 31 shown in FIGS. 3A and 3B, it always elastically contacts the filtration surface 11A. The same performance as the resin shoe 31 is exhibited. Further, since the notch 41B is provided on the bottom surface of the resin shoe 41 and the peak portion of the leaf spring 43 enters into the notch 41B, the width of the resin shoe 41 is reduced and the small screw blade 12B is used. Even if it exists, the shoe mechanism 40 can be adapted.

  The shoe mechanism 40 shown in FIGS. 4A to 4C has been described as having a single type of resin shoe 41 and a leaf spring 43, but elastic rubber 33B is used like the shoe mechanism 30 shown in FIG. The resin shoe 31 may be mixed. Also in this embodiment, the same effect as the said embodiment can be expected.

  INDUSTRIAL APPLICABILITY The present invention can be used as a solid-liquid separation device that squeezes an object to be treated such as sludge and slurry to separate the liquid and solid.

10 Screw press 11 Rotating drum 11A Filtration surface
12 screw 12B screw blade 30, 40 shoe mechanism 31, 41 resin shoe 31A, 41A long hole (hole)
32, 42 Storage body 33 Elastic member 33A, 43 Leaf spring (elastic member)
33B Elastic rubber (elastic member)
34, 44 Screw member (protruding prevention member)

Claims (5)

A rotary drum having a cylindrical filtration surface; and a screw having screw blades provided along an axis in the rotary drum, and the rotary drum and the screw are rotated through both of the above. A screw press that squeezes an object to be processed supplied into a rotating drum to separate the solid content and the separated liquid into a solid liquid, and a shoe mechanism that removes the solid content adhering to the filtration surface is an outer peripheral edge of the screw blade. The shoe mechanism includes a shoe that elastically slides on the filtration surface, a storage body that stores the shoe, and an elastic that elastically slides the shoe on the filtration surface in the storage body. and member, have a, a pop-out preventing member for preventing the popping out from the housing body of the shoe, the pop-out preventing member, the shoe is attached to the housing body above yield Screw press, characterized in that it is constructed as a screw member for swingably supported by the body.   The screw press according to claim 1, wherein the shoe mechanism is provided over the entire outer peripheral edge of the screw blade.   The screw press according to claim 1 or 2, wherein the shoe mechanism includes a plurality of the shoes, and each of the plurality of shoes is formed of an arc-shaped resin.   4. The shoe mechanism according to claim 1, wherein the shoe mechanism includes a plurality of elastic members, and the plurality of elastic members include at least one of a spring member or an elastic member formed of an elastic body. The screw press of any one of Claims. The screw press according to any one of claims 1 to 4, wherein the shoe has a hole in which the screw member is loosely fitted.

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