JP2006232438A - Screw conveyer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw conveyor device capable of suppressing damage and deterioration of a screw blade and a casing and performing smooth conveying. <P>SOLUTION: The screw conveyor device 1 is provided with the helical screw blade 5; the casing 2 for storing the screw blade 5; and a drive part 6 for rotating the screw blade 5. Lack parts 31, 32 with no screw blade 5 are provided on a position opposed to a feeding port 15 for feeding an article to be conveyed into the casing 2 and a discharge port for discharging the article to be conveyed from the inside of the casing 2. Thereby, clogging of the article to be conveyed can be prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a screw conveyor device.

  For example, in the disposal of industrial waste, after the waste is incinerated by an incinerator, the husks and fly ash discharged from the incinerator are conveyed using a screw conveyor or the like and accumulated in a tank or the like.

  In general, a screw conveyor device includes screw blades spirally attached along a screw shaft and a cylindrical casing that houses the screw blades. The powder-like object to be conveyed is supplied between screw blades from a supply port opened in the casing. Then, the screw blades rotate with the rotation of the screw shaft, so that the object to be conveyed is pushed and conveyed by the screw blades and discharged from the discharge port of the casing (for example, see Patent Document 1). ).

JP 11-254193 A

  However, the conventional screw conveyor device has a problem that the inner surface of the screw blade or the casing is easily damaged or deteriorated. Especially near the supply port, the screw blades were easily damaged by the impact of the supplied object. In addition, the object to be conveyed is clogged near the supply port, and the screw blades and the inner surface of the casing are rubbed with the object to be conveyed, which tends to deteriorate. Even in the vicinity of the discharge port, the object to be transported is not smoothly discharged and is easily clogged, and the screw blades and the inner surface of the casing are rubbed and easily deteriorated. In addition, when transporting high-temperature items such as, for example, burned husks immediately after being discharged from the incinerator, the screw blades may be deteriorated or deformed near the supply port due to the heat of the conveyed object. Such damage and deterioration of the screw blades and casing caused deterioration of conveyance performance, failure, etc., and time and labor for repairs were required. In addition, there is a problem that conveyance is not performed smoothly because the object to be conveyed is clogged near the supply port and the discharge port.

  The objective of this invention is providing the screw conveyor apparatus which can suppress damage and deterioration of a screw blade and a casing, and can perform smooth conveyance.

  In order to solve the above-described problems, according to the present invention, a spiral screw blade, a casing that houses the screw blade, and a drive unit that rotates the screw blade are provided, and an object to be conveyed is supplied into the casing. And a discharge port for discharging the object to be conveyed from the casing, and a notch portion without the screw blades is provided at a position facing the supply port and / or the discharge port. A screw conveyor device is provided. According to such a screw conveyor device, the transported object can be smoothly supplied and discharged, and the transported object can be prevented from being clogged. Therefore, it is possible to prevent the screw blades and the casing from being worn or deteriorated. In particular, when transporting a high-temperature transported object, heat dissipation of the transported object is promoted at the notch, so that the transported object is efficiently cooled, and damage to the screw blades and casing due to heat is reduced. Deterioration can be prevented.

  A central axis of the screw blade may be directed laterally, and the supply port may be opened obliquely upward with respect to the central axis around the central axis. In this case, it is possible to reduce the impact received by the screw shaft or the like when the conveyed object is supplied. The discharge port may be opened downward with respect to the central axis around the central axis. In this case, the object to be transported falls due to its own weight and is easily discharged.

  Moreover, you may provide a thick part in the peripheral part of the said screw blade | wing. Thereby, the peripheral part of a screw blade can be strengthened and wear can be prevented. The to-be-conveyed object may be an incinerator generated by incineration of waste.

  According to the present invention, the object to be conveyed can be prevented from being clogged in the vicinity of the supply port or in the vicinity of the discharge port by providing the notch portion at a position facing the supply port or the discharge port. That is, the casing, screw blades and screw shaft can be prevented from rubbing against the incinerated material. Therefore, damage and deterioration of the casing, screw blades and screw shaft can be suppressed. Heat dissipation of the incinerated material is promoted in the missing part, and damage and deterioration due to heat of the casing, screw blades and screw shaft can be prevented. Furthermore, it is possible to smoothly and continuously supply, transport, and discharge the object to be transported.

  Hereinafter, a preferred embodiment of the present invention will be described based on a screw conveyor device that conveys incinerated materials discharged from an incinerator. In the present embodiment, the object to be transported is a particulate or powder incinerator generated by incineration of waste, and such incinerator includes burned husks, fly ash, and the like.

  As shown in FIG. 1, a screw conveyor device 1 accommodates a substantially round rod-shaped screw shaft 3 and screw blades 5 spirally attached along the screw shaft 3 in a cylindrical casing 2. It becomes the composition. The casing 2 and the internal screw shaft 3 are directed in the lateral direction (left and right in FIG. 1). In FIG. 1, the casing 2 and the screw shaft 3 are inclined slightly with respect to a substantially horizontal plane, for example, about 15 °. It is supported. Outside the casing 2, there is provided a drive unit 6 including, for example, a motor that rotates the screw shaft 3. The central axis of the screw blade 5 is coaxial with the central axis of the screw shaft 3.

  As shown in FIGS. 2 and 3, the casing 2 has a substantially U-shaped cross section, the curved portion 2 a side curved along the substantially semi-cylindrical shape is directed downward, and is provided so as to extend from both sides of the curved portion 2 a. Both side surfaces thus directed are directed in a substantially vertical direction, and the upper surface and both ends (the left and right ends in FIG. 1) are closed. As shown in FIG. 1, bearings 11 and 12 that rotatably support the screw shaft 3 are attached to both end plates of the casing 2.

  Further, a supply port 15 for supplying the incinerated material into the casing 2 is provided on one end portion side (the left end portion side in FIG. 1) of the casing 2. On the other end side of the casing 2 (on the right end side in FIG. 1), a discharge port 16 for discharging the incinerated material from the casing 2 is provided. The casing 2 is inclined so as to rise from the supply port 15 side toward the discharge port 16 side.

  As shown in FIG. 2, the supply port 15 is opened obliquely above the casing 2 body on the side of the casing 2 body (left side in FIG. 2). That is, it is opened around the central axis of the screw shaft 3 so as to face the central axis of the screw shaft 3 and obliquely upward, and to face the outer peripheral surface of the screw shaft 3 diagonally upward. . An incinerator discharge port 21 for discharging the incinerated material from the incinerator is connected to the supply port 15 via a cylindrical joint portion 22 formed of, for example, rubber. The incinerated product supplied from the supply port 15 is supplied to the screw shaft 3 in the casing 2 so as to fall from the side and obliquely upward. In this way, the impact on the screw shaft 3 is reduced as compared with the case where the incinerator falls from directly above the screw shaft 3. The incinerated product supplied from the supply port 15 may be supplied in a direction inclined about 40 ° upward with respect to a substantially horizontal plane, for example.

  As shown in FIG. 1, the discharge port 16 is opened below the casing 2. That is, it is opened downward with respect to the outer peripheral surface of the screw shaft 3 around the central axis of the screw shaft 3. In this way, the incinerated product falls to the discharge port 16 due to the weight of the incinerated product, which makes it easy to discharge. A hopper 25 is provided below the discharge port 16. The incinerated product discharged from the discharge port 16 is put into the hopper 25 and is transported to the next process by a transport mechanism (not shown) disposed below the hopper 25.

  The screw shaft 3 is disposed along a center line located at an equal distance from the inner surface of the curved portion 2a, and both ends are rotatably supported by bearings 11 and 12, respectively. That is, it is supported in an inclined posture so as to rise from the bearing 11 side toward the bearing 12 side. Further, one end (left end in FIG. 1) of the screw shaft 3 protrudes from the bearing 11 to the outside of the casing 2 and is connected to the drive unit 6.

  The screw blade 5 has a shape in which a thin strip is spirally wound a plurality of times, for example, about 15.5 times, and the inner edge is fixed along the outer peripheral surface of the screw shaft 3. Is provided so as to extend toward the periphery of the screw shaft 3. The outer peripheral edge of the screw blade 5 is spirally disposed along a substantially cylindrical shape with the screw shaft 3 as a central axis. Further, in the casing 2, the screw blade 5 is provided in a state where the outer peripheral edge of the screw blade 5 is brought close to the inner surface of the curved portion 2 a and is provided to a position close to both end plates of the casing 2. ing. In the illustrated example, the screw blade 5 is right-handed. That is, when the screw shaft 3 rotates rightward as viewed from the end on the supply port 15 side, the screw blade 5 advances from the end on the supply port 15 side toward the end on the discharge port 16 side while rotating right. The right-handed winding direction is visible. In the illustrated example, the pitch between the outer peripheral edge of the screw blade 5 and the outer peripheral edge at a position advanced by one rotation, that is, the pitch between the outer peripheral edge portions adjacent in the axial direction of the screw shaft 3 is: Each is equally spaced. It should be noted that the outer diameter of the screw blades 5 and the pitch of the screw blades 5 when viewed from the end side of the screw shaft 3 are the particle size of the incinerated product and the unit time supplied from the supply port 15. What is necessary is just to set suitably based on supply amount etc., For example, the outer diameter of the screw blade | wing 5 should just be about 500 mm and a pitch should be about 400 mm.

  Further, a notch 31 without the screw blade 5 is provided at a position facing the supply port 15. In the notch 31, the entire outer periphery to the inner periphery of the screw blade 5 are removed. The length at which the screw blade 5 is removed in the notch 31 may be set as appropriate based on the size of the supply port 15, for example, about 0.5 to 1.5 rotations of the screw blade 5. May be. For example, when the inner diameter of the supply port 15 is about 560 mm, the length of the notch 31 in the axial direction of the screw shaft 3 viewed from the outer peripheral side of the screw shaft 3 is, for example, about 200 mm to 500 mm. You may do it.

  At a position facing the discharge port 16, a notch portion 32 without the screw blades 5 is provided. In the notch part 32, the outer periphery to the inner periphery of the screw blade 5 are all removed. The length at which the screw blade 5 is removed in the notch portion 32 may be set as appropriate based on the size of the discharge port 16 and the like. For example, the length of the screw blade 5 is about 0.5 to 1.5 rotations. May be.

  Next, a method for conveying an object to be conveyed by the screw conveyor device 1 configured as described above will be described. First, in the casing 2, the screw shaft 3 is rotated rightward as viewed from the end on the supply port 15 side by driving the drive unit 6, and the screw blade 5 is integrated with the screw shaft 3 on the supply port 15 side. It can be rotated to the right when viewed from the edge. The outer peripheral edge of the screw blade 5 rotates along the inner surface of the curved portion 2 a of the casing 2.

  The incinerated product falls from the hearth of the incinerator to the incinerator discharge port 21 due to its own weight and is discharged into the casing 2 through the joint portion 22 and the supply port 15. At this time, the incinerated material is thrown toward the notch 31 provided at a position facing the supply port 15. Since the screw blade 5 is removed in the notch 31 and a sufficient space is formed between the screw shaft 3 and the inner surface of the casing 2, the incinerated material is not obstructed by the screw blade 5. , It is thrown in with a margin. In addition, since the incinerated product does not collide with the screw blades 5 during supply, the screw blades 5 can be prevented from being damaged by the impact of the incinerated product. In particular, although the incinerated product immediately after being discharged from the incinerator is hot, it can prevent the incinerated product from directly colliding with the screw blades 5 at the time of supply. Can be prevented. Furthermore, in the lacking part 31, the heat of the incinerated product is easily dissipated, and the temperature of the incinerated product can be lowered appropriately. Therefore, it is possible to prevent the casing 2, the screw shaft 3, and the screw blade 5 from being damaged or deteriorated due to the heat of the incinerated material on the discharge port 16 side from the notch 31. Further, the incinerated product is supplied so as to fall obliquely from above with respect to the outer peripheral surface of the screw shaft 3. In this case, the impact received by the screw shaft 3 can be reduced as compared with the case where the incinerated material falls from directly above the screw shaft 3. Therefore, damage and deterioration of the screw shaft 3 can be suppressed.

  The incinerated product supplied to the notch 31 is pushed toward the discharge port 16 by the rotating screw blades 5 and moves between the adjacent screw blades 5. Since the incinerated product is charged in the notch 31 with a margin, it moves smoothly between the screw blades 5 without clogging in the vicinity of the supply port 15. And it is smoothly conveyed along the axial direction of the screw shaft 3 by moving sequentially between the screw blades 5 while being pushed by the rotating screw blades 5. In this case, even if the incinerated material is continuously supplied from the supply port 15, the incinerated material is not clogged and smooth conveyance can be performed.

  While being conveyed by the rotation of the screw blades 5, the incinerated materials are deprived of heat by being brought into contact with the casing 2, the screw shaft 3, and the screw blades 5 and are cooled. Such cooling may be performed, for example, so that the temperature of the incinerated product when discharged to the discharge port 16 is equal to or lower than the heat resistance temperature of the hopper 25 or a transport mechanism (not shown) that transports from the hopper 25. If the transport mechanism is made of steel members, it is sufficient that the temperature of the incinerated product is about 300 ° C. or less, for example.

  The incinerated product conveyed to the discharge port 16 side reaches the removal portion 32, and falls to the discharge port 16 from the removal portion 32 due to the weight of the incineration material and the extrusion pressure by the screw blades 5, and enters the hopper 25. Collected. Since the screw blade 5 is removed in the notch 32 and a sufficient space is formed between the screw shaft 3 and the inner surface of the casing 2, the incinerated material is not obstructed by the screw blade 5. , It is discharged with a margin. Therefore, the incinerated product can be prevented from being clogged near the discharge port 16, and the incinerated product can be discharged smoothly and continuously. Furthermore, the heat of the incinerated material is easily dissipated in the lacking portion 32, and cooling of the incinerated material can be promoted. The incinerated material collected in the hopper 25 is transported from the hopper 25 by a transport mechanism (not shown) and is collected, for example, in a tank or the like.

  According to the screw conveyor device 1, by providing the cut-out portions 31 and 32, it is possible to prevent the incinerated product from being clogged near the supply port 15 and the discharge port 16. Accordingly, the inner surface of the casing 2, the screw shaft 3 and the screw blade 5 can be prevented from rubbing against the incinerated material, and damage and deterioration of the inner surface of the casing 2, the screw shaft 3 and the screw blade 5 can be effectively suppressed. it can. Even when supplying a high-temperature incinerated product, it is possible to prevent the screw blade 5 from being damaged or deteriorated due to thermal shock in the vicinity of the supply port 15. In addition, the heat removal of the incineration material is promoted in the lacking portions 31 and 32, and the cooling is efficiently performed. That is, by providing the lacking portions 31 and 32, a buffering action against the heat of the incinerated product can be obtained, and damage and deterioration of the casing 2, the screw shaft 3 and the screw blade 5 due to thermal shock can be prevented. As described above, since the damage and deterioration of the casing 2, the screw shaft 3 and the screw blade 5 are suppressed, labor for inspection, repair, replacement and the like can be reduced.

  In addition, incineration can be supplied, transported and discharged smoothly. Even if incinerated materials are continuously supplied, they can be smoothly supplied, transported and discharged without clogging, so continuous transport is possible and transport efficiency can be improved. Further, even if the rotational speeds of the screw shaft 3 and the screw blades 5 are increased, damage and deterioration can be suppressed. Therefore, it is possible to increase the conveying speed and improve the conveying efficiency.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various changes and modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  The shape of the casing 2, the screw shaft 3, and the screw blade 5 is not limited to that shown in the embodiment. For example, the casing 2 is substantially U-shaped in cross section, but may be cylindrical. Further, although the screw shaft 3 has a round bar shape, for example, auxiliary blades that rotate integrally with the screw shaft 3 may be attached to the outer peripheral surface of the screw shaft 3. In this case, the surface area in contact with the incinerated product can be increased, and the cooling efficiency can be improved. That is, the incinerated product is agitated by the rotation of the auxiliary blades during the conveyance, and the heat of the incinerated product is transferred to the auxiliary blades and taken away, so that the cooling of the incinerated product is promoted. Therefore, it is possible to improve the cooling speed and further the transport speed. Further, for example, a coolant feeding path for allowing the coolant to pass therethrough may be provided inside the screw shaft 3. If it does so, the screw shaft 3 and the screw blade | wing 5 can be cooled by flowing a refrigerant | coolant through a refrigerant | coolant liquid supply path during conveyance of an incinerated thing, and the cooling of an incinerated thing can be accelerated | stimulated. Moreover, the damage and deterioration by the heat | fever of the screw shaft 3 or the screw blade | wing 5 can be suppressed. Therefore, it is possible to improve the cooling rate and the conveyance speed.

  As shown in FIG. 4, a thick portion 40 may be provided on the outer peripheral edge of the screw blade 5. In this case, the durability of the outer peripheral edge of the screw blade 5 is improved, and wear, damage, and deterioration of the outer peripheral edge can be effectively suppressed.

  In the present embodiment, the lacking portions 31 and 32 are all missing from the outer peripheral edge to the inner peripheral edge of the screw blade 5, but only a part of the outer peripheral edge side of the screw blade 5 is omitted. The inner peripheral edge may be left. Also in this case, since sufficient space is formed between the screw blade 5 and the inner surface of the casing 2 in the lacking portions 31 and 32, clogging of the incinerated materials can be prevented, and supply and discharge can be facilitated. it can.

  In the present embodiment, the incinerated material is exemplified as the material to be conveyed, but the material to be conveyed is not limited to this. The present invention can be applied to, for example, various types of screw conveyor devices that convey, for example, earth and sand, sludge, shredder dust of discarded automobiles and discarded household electrical appliances, and other various particles and powders as objects to be conveyed.

  The present invention can be applied to a screw conveyor device that conveys an object to be conveyed such as particles or powders.

It is a schematic longitudinal cross-sectional view of a screw conveyor apparatus. It is a schematic sectional drawing by the AA in FIG. It is a schematic sectional drawing by the BB line in FIG. It is a longitudinal cross-sectional view of the screw blade concerning embodiment which provided the thick part in the outer periphery of the screw blade.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screw conveyor 2 Casing 3 Screw shaft 5 Screw blade 6 Drive part 15 Supply port 16 Discharge port 31,32 Deletion part

Claims (5)

A spiral screw blade, a casing that houses the screw blade, and a drive unit that rotates the screw blade;
A supply port for supplying an object to be conveyed into the casing and an outlet for discharging the object to be conveyed from the casing;
A screw conveyor device, characterized in that a notch portion without the screw blades is provided at a position facing the supply port and / or the discharge port. The central axis of the screw blade is oriented laterally;
The screw conveyor apparatus according to claim 1, wherein the supply port is opened obliquely upward with respect to the central axis around the central axis. The central axis of the screw blade is oriented laterally;
The screw conveyor device according to claim 1 or 2, wherein the discharge port is opened downward with respect to the central axis around the central axis. The screw conveyor apparatus according to claim 1, 2 or 3, wherein a thick part is provided at a peripheral part of the screw blade. 5. The screw conveyor device according to claim 1, wherein the object to be transported is an incinerator generated by incineration of waste.

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