JP2009136809A - Rotating drum type filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance convenience for maintenance by attaching a floating seal without largely changing a structure of a rotating drum type filter. <P>SOLUTION: The rotating drum type filter has a cylindrical drum part 4 having a filter 5 around the outer circumference rotatably supported by a stationary shaft 3 which is vertically fixed to a base plate 2 wherein the floating seal 17 is such that first and second seal plates 15, 16 are respectively held by a first plate 9 screwed to fix from an outside plane and a second plate 10 screwed to fix from a filter side of an opening flange 6 onto the base plate mutually through O rings 13, 14 at the inner diameter side of a ring, and the first and second seal plates mutually contact to slide on surfaces 15a, 16a on the axial direction. A labyrinth 30 is formed by the first plate and the second plate, and a sprocket 28 is fitted to fix to a cylindrical outer circumference part 27. Coolant 53 is streamed in an opening part side from the outer circumferential plane of the filter to filtrate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotary drum type filter, and more particularly to a seal structure thereof.

  Conventionally, in a machine tool or the like, processing is performed while applying a cutting fluid in order to improve the machinability of a workpiece. In order to reuse the cutting fluid, it is necessary to separate the machining waste that is discharged together with the cutting fluid during processing. For example, in the rotating drum type filter of Patent Document 1, the filter is wound around the outer periphery of a rotating drum that rotates around a fixed shaft, and is installed so as to be immersed in the cutting fluid in a clean tank, and one end surface of the rotating drum is opened. Then, the cutting fluid is moved from the inside to the outside of the filter of the rotating drum so as to be guided to the dirty tank. Thereby, the dirty cutting fluid is filtered with a filter and separated into cutting waste and cutting fluid.

  More specifically, this is provided with a fixed shaft fixed to a fixed base plate that can communicate with the dirty tank side through an opening hole, and a cylindrical drum is provided on the fixed shaft so that both ends can be rotated. A filter is wound around the outer periphery of the cylindrical drum, and disc-shaped flanges are provided at both ends. The flange on the base plate side is provided with an opening flange having an opening communicating with the opening of the base plate, and the other end is a closing flange. The cylindrical drum is disposed in a clean tank. The space between the opening hole of the base plate and the opening portion of the opening flange is a closed space and is isolated from the clean tank. The cutting oil from the dirty tank passes through the opening of the base plate, the closed space, the opening of the opening flange, passes through the filter from the inside of the cylindrical drum, and is discharged to the clean tank side outside the cylindrical drum. It is also known that the clean tank and the dirty tank are reversed. In this case, the cutting oil is moved from the outside to the inside of the cylindrical drum filter.

  In order to increase the filtration efficiency of the cylindrical drum, a sprocket is provided on the cylindrical drum, and a chain is wound around the sprocket and the cylindrical drum is rotated by an electric motor with a speed reducer. Rotate relatively. For this reason, in order to ensure a closed space, a seal is provided between the outer periphery of the opening hole of the base plate and the outer periphery of the opening portion of the opening flange. However, this seal is made of rubber, synthetic resin or the like, and has a large wear, so that the sealing performance is deteriorated at an early stage, the filtration efficiency is lowered, and frequent replacement is required.

On the other hand, a floating seal is known as a seal structure. For example, as shown in Patent Document 2, the floating seal is known as a seal structure of a hydraulic travel motor with a speed reducer that rotates a crawler such as a hydraulic excavator of a construction machine. This is a ring-shaped structure in which the opposing surfaces in the axial direction of the inner peripheral surface of the opposite ends of the stationary side (hydraulic motor unit) casing body and the rotating side (reduction gear unit) casing body are in sliding contact. A pair of alloy steel seal rings are held between the inner peripheral surfaces of both casing bodies so as to apply a pressing force in the axial direction via O-rings. Moreover, the labyrinth seal is comprised by the casing end surfaces of the outer side of a floating seal. This prevents leakage of lubricating oil inside the speed reduction unit and intrusion of mud, water, etc. from the outside.
Utility Model Registration No. 2573529 JP 2007-1540 A

  Therefore, it is expected to use a floating seal instead of a conventional rubber seal to prevent wear and extend the maintenance period. However, there is no known one that uses a floating seal as a seal for a cylindrical drum filter. Furthermore, the casing of a hydraulic traveling motor with a speed reducer to which the floating seal is attached is made of cast iron, cast steel, iron cutting material, or the like, so it is rigid and strong. On the other hand, the rotary drum type filter is manufactured by cutting out a plate-like material from the surface of cost and shape, that is, manufacture by sheet metal, and such high rigidity cannot be secured, and a seal ring is provided via an O-ring. There was a problem that it was not possible to apply an axial pressing force to. Moreover, since the labyrinth seal has a small gap, there is a problem that it cannot be manufactured by sheet metal. Further, when the plate-like material is made thick to increase the rigidity, there is a problem that the cost is increased and the attachment to the counterpart tank and the attachment of the sprocket are complicated.

  In view of such problems, the object of the present invention is to make it possible to attach a floating seal to the seal of a cylindrical drum filter, to improve the seal life, extend the maintenance period, and further facilitate maintenance. is there. Another object is to attach a floating seal without greatly changing the conventional structure.

  In the present invention, a base plate that is fixed to the outer surface of the tank wall and has an opening hole that can communicate with the tank, a fixed shaft that is fixed vertically to the base plate, and both ends of the fixed shaft that are rotatable. A cylindrical drum portion supported by the shaft, the cylindrical drum portion provided on the outer peripheral surface, and an opening flange provided on an end of the base plate and having an outer periphery larger than the outer peripheral surface of the filter. A rotary drum type filter having a closing flange provided at the other end, and is screwed and fixed to the inner peripheral end surface of the base plate with a bolt from the outer surface of the base plate concentrically with the fixed shaft. The ring-shaped first plate and the base plate are fixed by screwing with bolts from the filter outer peripheral surface and the filter side surface of the opening flange concentrically with the fixed shaft at a position facing the first plate of the base plate. A ring-shaped second plate, and the first plate and the second plate are respectively ring-shaped first seal plate and second seal plate via O-rings on the ring inner diameter side. The above-described problems have been solved by providing a rotary drum type filter in which the first and second seal plates are in sliding contact with each other on axially opposed surfaces.

  That is, since the rigid ring-shaped first plate is screwed and fixed to the inner end surface of the outer peripheral portion of the base plate made of a thin plate material similar to the conventional one with bolts from the outer surface of the base plate, the tank wall of the base plate Mounting to the first plate can be performed by using the outer peripheral portion of the base plate or by screwing to the first plate from the side of the base plate. In addition, since a ring-shaped second plate having rigidity on the outer end face of the opening flange made of a thin plate material similar to the conventional one is screwed and fixed with bolts from the filter outer peripheral surface and the filter side surface of the opening flange, the cylindrical drum is conventionally used. It is sufficient to increase the outer diameter of the opening flange. Furthermore, the first plate and the second plate urge the first and second seal plates so that their axially opposed surfaces are in sliding contact with each other via an O-ring on the inner diameter side of the ring, thereby forming a floating seal. it can.

  Furthermore, in the invention according to claim 2, the second plate opposes the inner end face of the axially outer peripheral step provided on the outer periphery of the first plate with a gap, and further covers the outer periphery with a gap. Extending in the axial direction, facing the outer end face with a gap, and having a cylindrical outer peripheral portion that forms a labyrinth with the first plate, and a sprocket is fitted and fixed to the cylindrical outer peripheral portion. The rotating drum type filter.

  That is, a rigid ring-shaped plate is arranged to increase the rigidity of the base plate and the opening flange, and the plates are arranged to face each other to form a labyrinth groove. Further, since the sprocket is fitted and fixed to the cylindrical outer peripheral portion forming the labyrinth groove, it is easy to replace and attach, and the second plate has rigidity, so that it can be securely attached.

  According to a third aspect of the present invention, the rotary drum filter is configured to filter the coolant when the coolant flows from the outer peripheral surface of the rotary drum filter to the opening side. That is, since the labyrinth groove is disposed on the outside, the direction in which the cutting fluid or the like leaks is suitable to the labyrinth groove or the sliding contact surface of the seal plate.

  As described above, in the present invention, the first and second seal plates are opposed to each other in the axial direction via the O-ring by the first plate provided on the base plate and the second plate provided on the opening flange. By energizing the surfaces so that they come into sliding contact with each other, a floating seal can be constructed, so that the seal life is improved and the maintenance period can be extended. In addition, the first plate is screwed and fixed with bolts from the outer surface of the base plate, and can be easily attached to the tank wall as in the prior art. Further, the second plate is attached from the filter outer peripheral surface and the filter side surface of the opening flange. Since the outer diameter of the opening flange is increased to the extent that it is fixed by screwing with a bolt, it can be easily mounted without greatly changing the conventional structure.

  Furthermore, in the invention described in claim 2, the rigidity of the base plate and the opening flange is increased by the ring-shaped plate, and further, the labyrinth groove is formed, so that the sealing performance is improved. In addition, the sprocket fitted and fixed to the cylindrical outer periphery is easy to replace and install, and it can be securely attached to the second plate, so the sprocket has increased rigidity compared to the conventional case and rotates smoothly. It becomes. Further, in the invention described in claim 3, the coolant is allowed to flow from the outer peripheral surface of the rotary drum filter to the opening side so that the sealing performance is further improved.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a rotary drum type filter and tank showing an embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view of a floating seal and a labyrinth. In this type, the rotating drum side is placed on the dirty tank side, coolant such as cutting fluid is filtered from the outer peripheral surface of the rotating drum filter to the inside, and discharged to the clean tank side through the internal opening and opening hole. is there. As shown in FIG. 1, a clean tank 41 and a dirty tank 51 are provided side by side, and a fixed shaft 3 is fixed vertically to a base plate 2 fixed to a clean tank outer wall (or a dirty tank inner wall on the clean tank side) 42, Further, the other end 3 b of the fixed shaft is fixed to the tank inner wall 52 of the dirty tank, and the fixed shaft is fixed between the clean tank outer wall (dirty tank inner wall) 42 and the dirty tank inner wall 52. A cylindrical drum portion 4 is provided on the fixed shaft so as to be rotatable at both ends. The cylindrical drum portion 4 is disposed so as to be partially or entirely immersed in the coolant 53 in the dirty tank 51.

  The rotary drum type filter 1 of the present invention includes the base plate 2, the fixed shaft 3, and the rotary drum portion 4 described above. The base plate 2 is provided with an opening hole 2 a communicating with a tank hole 42 a opened in the clean tank wall 42. The opening hole 2 a is formed by a rib 2 c extending outward from the rotating shaft fixed edge 2 b of the base plate 2 and an outer peripheral portion 2 d connected to the rib and concentric with the fixed shaft 3.

  A filter 5 is provided on the outer peripheral surface 4a of the cylindrical drum portion 4, and an opening flange 6 and a closing flange 7 having a diameter larger than the outer periphery of the filter are provided at both ends. Roller bearings 8 and 8 with seals are attached to bosses 6 b and 7 b at the center of both flanges, and the cylindrical drum portion 4 is rotatable with respect to the fixed shaft 3. The opening flange 6 is provided on the base plate 2 side, and an opening 6a is formed by a rib 6c extending outward from the boss 6b and an outer peripheral portion 6d connected to the rib and concentric with the fixed shaft 3. Has been.

  A ring-shaped first plate 9 is provided on the inner peripheral surface 2e of the outer peripheral portion 2d of the base plate 2 so as to be concentric with the fixed shaft 3, and is screwed and fixed with bolts 11 from the outer surface 2f of the base plate 2. Yes. A ring-shaped second plate 10 is provided on the base plate side inner end surface 6e of the opening flange 6 so as to be concentric with the fixed shaft 3, and is screwed with bolts 12 from the filter outer peripheral surface and the filter 5 side surface of the opening flange. It is fixed. Thereby, the 1st plate 9 and the 2nd plate 10 are arrange | positioned facing. As shown in FIG. 2, the first plate 9 and the second plate 10 further have a ring-shaped first seal plate 15 and a second seal, respectively, through O-rings 13 and 14 on the ring inner diameter sides 9a and 10a. The plate 16 is held, and the first and second seal plates are in sliding contact with each other in the axial facing surfaces 15a and 16a. Thereby, the floating seal 17 is formed, the opening hole 2a and the opening 6a are closed and communicated, and the opening hole and the opening, that is, the base plate 2 and the cylindrical drum part are sealed while sealing the inside and outside of the cylindrical drum part 4. 4 can be rotated relative to 4.

  The base plate 2 and the first plate 9 are attached to the clean tank wall 42 through the clean tank wall and through holes 43 and 44 penetrating the base plate to the screw 9b formed in the first plate 9 on the clean tank wall 42 side. The bolt 18 is screwed and attached. It is also possible to make a mounting by making a bolt hole on the outer periphery 2d of the base plate, providing a screw hole or nut on the clean tank wall 42 side, and screwing the bolt from the base plate side.

  The second plate 10 includes a second plate-side inner end surface 22 that is opposed to the inner end surface 21 of the axially outer peripheral stepped portion provided on the outer periphery of the first plate 9 with a gap, and a gap between the second plate 10 and the outer peripheral portion 23 of the first plate. And an inner diameter portion 24 that extends in the axial direction so as to cover the first plate, and a second plate end surface 26 that faces the outer end surface 25 of the first plate with a gap. Thereby, the labyrinth 30 is formed by the first plate 9 and the second plate 10.

  A sprocket 28 is fitted to a cylindrical outer peripheral portion 27 that forms the second plate end surface 26, and is fixed by a bolt 29. The cylindrical drum portion 4 is rotated by applying rotational power to the sprocket 28 by an unillustrated electric motor with a reduction gear and a chain. As shown in FIG. 1, the fixed shaft 3 is made of a pipe material, has a through hole 3a, has an opening 3b on the clean tank 41 side, is connected to a cleaning liquid supply device or an air supply device (not shown), and the other end is It is blocked by the plug 3d. A plurality of communication holes 3c are formed at right angles to the through-holes 3a, and nozzles 31 are respectively provided to remove dust, cutting waste, and the like attached to the outside of the filter 5 from the filter.

  Reference numerals 32 and 33 are a positioning rod and a positioning plate for maintaining the shape of the cylindrical drum. Reference numeral 34 denotes a positioning pin, reference numeral 35 denotes an oil seal, and reference numeral 36 denotes a retaining ring for the oil seal. The oil seal 35 seals a gap 37 for relative rotation between the inner surface 7c of the closing flange 7 on the closing flange 7 side of the cylindrical drum portion 4 and the fixed shaft 3. Since the gap 37 has a small diameter and is adjacent to the bearing 8, there is little substantial leakage, so that a conventional seal is sufficient. Further, the coolant tank 41 can be disposed on both sides of the dirty tank 51 via the base plate 2 in the same manner as the closing flange 7 side.

  Next, the operation of the embodiment of the present invention will be described. The dirty tank 51 and the clean tank 41 communicate with the filter 5, the opening 6a, the opening hole 2a, and the tank hole 42a of the cylindrical drum portion 4 of the rotary drum filter 1, so that the dirty tank supplied to the dirty tank is contaminated. The coolant 53 returns to the clean tank 41 side through the filter 5, the opening 6 a, the opening hole 2 a, and the tank hole 42 a due to a drop caused by the decrease in the coolant 54 on the clean tank side (see the arrow in FIG. 1). At this time, dust such as cutting waste on the dirty tank 51 side is filtered by the filter 5, and clean coolant is returned to the clean tank side.

  Further, the cylindrical drum portion 4 is rotated in order to increase the efficiency of the filter 5, and cutting scraps and the like attached to the outer peripheral surface of the filter are dropped to the tank bottom by a scraper (not shown) that scrapes the filter surface of the rotating drum portion by its own weight. . Furthermore, it is removed by a cleaning liquid or air blow by the nozzle 31 and is precipitated at the bottom of the dirty tank. The deposited cutting waste on the dirty tank side is expelled to the outside by a scraping conveyor (not shown) installed at the bottom of the dirty tank.

  In particular, in the embodiment of the present invention, the labyrinth 30 seal and the floating seal 17 are used as the seal between the opening flange 6 of the cylindrical drum portion and the base plate 2 by the rotation of the cylindrical drum portion 4. Even if it is a coolant, there is little wear and it can be used for a long time. In addition, the ring-shaped plates 9 and 10 that hold the floating seal 17 can be easily attached to a conventional rotary drum filter, so that design changes are small, design and manufacture are easy, and assembly and disassembly are easy. Yes, maintainability is improved. The filter may be a general filter such as a wire mesh or a wedge wire, but a wedge wire is preferable because the seal side has a long life.

It is a longitudinal cross-sectional view of the rotating drum type filter and tank which show embodiment of this invention. It is a partial expanded sectional view of the floating seal | sticker and labyrinth which show embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating drum type filter 2 Base plate 2a Opening hole 3 Fixed shaft 4 Cylindrical drum part 4a Outer peripheral surface 5 Filter 6 Opening flange 6a Opening part 7 Blocking flange 9 First plate 10 Second plate 11 Bolt 12 Bolt 13, 14 O-ring 15 First seal plate 15a First seal plate sliding contact surface 16 Second seal plate 16a Second seal plate sliding contact surface 17 Floating seal 21 Inner end surface of first plate 23 Outer peripheral portion of first plate 25 Outer end surface of first plate 27 Cylindrical outer periphery 28 Sprocket 30 Labyrinth (seal)
42 Tank wall outer surface 53 Coolant

Claims (3)

A base plate fixed to the outer surface of the tank wall and having an opening hole capable of communicating with the tank;
A fixed shaft fixed perpendicularly to the base plate;
A cylindrical drum portion rotatably supported on both ends of the fixed shaft,
The cylindrical drum portion includes a filter provided on an outer peripheral surface, an opening flange provided at an end on the base plate side and having an outer periphery larger than the filter outer peripheral surface, and a closing flange provided at the other end. A rotary drum filter,
A ring-shaped first plate screwed and fixed to the inner peripheral surface of the outer peripheral portion of the base plate by a bolt from the outer surface of the base plate concentrically with the fixed shaft;
A ring-shaped second plate that is screwed and fixed with bolts from the filter outer peripheral surface and the filter side surface of the opening flange concentrically with the fixed shaft at a position facing the first plate of the base plate; ,
The first plate and the second plate respectively hold a ring-shaped first seal plate and a second seal plate via an O-ring on the inner diameter side of the ring, and the first and second seal plates are mutually connected. A rotary drum type filter characterized by being in sliding contact with an axially opposed surface.   The second plate is opposed to the inner end surface of the axially outer peripheral stepped portion provided on the outer periphery of the first plate with a gap, and further extends in the axial direction so as to cover the outer peripheral portion with a gap. 2. A cylindrical outer peripheral portion that forms a labyrinth with the first plate, and a sprocket is fitted and fixed to the cylindrical outer peripheral portion. Rotating drum type filter.   The rotary drum filter according to claim 2, wherein the coolant is filtered by the coolant flowing from the outer peripheral surface of the rotary drum filter to the opening side.

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