JP2013086890A - Chute - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chute configured to receive falling powder or granular bodies and guide them downward which has a simple constitution, whose production cost is not increased, in which the sticking of powder or granular bodies on the inner peripheral surface thereof can be reduced, and in which the need for power is eliminated.SOLUTION: A plurality of strip plate-like materials 110 which are elastic and flexible are arranged successively in a peripheral direction while being decreased in diameter from an upper part to a lower part as a whole. A shrinkable ring member 120 is attached so as to cover outer peripheral surfaces of the plurality of strip plate-like materials 110. A slip member 111 formed of fluororesin having a small coefficient of friction is stuck on the inner surface of each strip plate-like material 110.

Description

  The present invention relates to a chute for receiving a falling powder or granular material and guiding it to a belt conveyor or the like.

  In order to prevent the material from adhering to the inner wall of the chute in a chute attached to a device that drops highly adherent material, such as mixed bentonite soil, the diameter of the chute is reduced rapidly. It is conceivable to incline or attach a member for preventing adhesion of material to the inner wall surface of the chute.

  However, when the diameter of the chute is too steep, the material falling speed cannot be reduced, and the speed reduction effect, which is one of the roles of the chute, is reduced. Further, there are cases in which the adhesion preventing effect cannot be sufficiently exhibited by simply attaching a member for preventing adhesion of the material to the inner wall surface of the chute.

  Conventionally, there has been proposed a chute for reliably guiding an article falling from above by preventing the article from being in a crosslinked state inside the chute (see Patent Document 1). In the technique described in Patent Document 1, a cylindrical member is constituted by a plurality of divided members, and these divided members are moved close to and away from each other to change the cross-sectional shape of the article dropping path. At this time, by pressing the cylindrical member from the side by the pressing member, the cross-sectional shape of the cylindrical member is changed to prevent the article from staying inside the cylindrical member. In addition, the split member has a structure in which the adjacent articles are moved away from each other while maintaining the state in which the adjacent side portions overlap each other, so that the articles inside do not accidentally spill out.

JP 2007-284145 A

  As described above, when a conventional chute is passed through a highly adherent material such as water-mixed bentonite mixed soil, the material adheres to the inner wall surface of the chute, and the material does not fall smoothly or the worst. In this case, the chute is clogged with material. In this regard, in the chute described in Patent Document 1, the cross-sectional shape of the chute is changed by the pressing member to prevent the falling articles from staying, and the pressing member (shape changing means) is essential. It is a component requirement. That is, the chute described in Patent Document 1 has a problem that the structure is complicated and the manufacturing cost increases. Furthermore, there is also a problem that power for operating the pressing member is required.

  The present invention has been proposed in view of the above-described circumstances, and has a simple configuration in a chute for receiving and guiding a falling powder or granular material downward, and its inner periphery without increasing manufacturing costs. An object of the present invention is to provide a chute that can reduce the adhesion of powder or granular material to a surface and further does not require power.

  The chute of the present invention has the following features in order to achieve the above-described object. That is, the chute of the present invention is a device for receiving and guiding a falling powder or granular material downward, and continuously and continuously a plurality of strip-shaped plate materials having elasticity and flexibility in the circumferential direction. It arrange | positions so that it may reduce in diameter toward the downward direction from upper direction, It is characterized by the above-mentioned. In the chute having such a configuration, when the falling powder or granular material collides with the inner wall surface of the chute, the impact causes the plurality of strip-shaped plate materials to vibrate, thereby preventing adhesion of the powder or granular material.

  Moreover, in addition to the structure mentioned above, it is preferable to attach the ring member which has contractibility so that the outer peripheral surface of a some strip-shaped board | plate material may be enclosed. In the chute having such a configuration, when the falling powder or granular material collides with the inner wall surface of the chute and the strip-shaped plate material is pushed outward, the strip-shaped plate material is spread by the ring member. To prevent.

  Further, in addition to the above-described configuration, it is preferable that the plurality of strip-shaped plate members are attached with a sliding member made of a fluorine resin (for example, polytetrafluoroethylene) having a small friction coefficient on the inner surface. In the chute having such a configuration, the sliding member smoothly flows down without adhering powder or granular material to the inner wall surface of the chute.

  According to the chute of the present invention, when the falling powder or granular material collides with the inner wall surface of the chute, a plurality of strip plate materials vibrate due to the impact, so the powder or granular material that collided with the inner wall surface of the chute vibrates. It is shaken off by the strip-shaped plate material, and the adhesion of the powder or the granular material to the inner wall surface of the chute can be effectively prevented. Furthermore, the power for vibrating the chute becomes unnecessary by converting and using the fall energy of the material to the vibration energy of the constituent member (strip-shaped plate material) of the chute.

  In addition, since the strip-shaped plate material is vibrated by the impact of the dropped material and the effect of preventing the material from adhering to the inner wall surface is enhanced, the applicable range of the reduced diameter angle of the chute is expanded (expanded to the gently inclined side) The chute height can be suppressed, and the chute can be installed in a small space.

  In addition, the ring member prevents the strip-shaped plate material from spreading outward, so that the gap between adjacent strip-shaped plate materials does not widen and prevents the powder or granular material from scattering outside the chute. Can do.

  Moreover, when the sliding member which consists of a fluororesin with a small friction coefficient is affixed on the inner wall surface of a strip-shaped board | plate material, adhesion of the powder or a granular material with respect to a chute | shoot inner wall surface can be prevented more effectively.

The perspective view of the chute concerning the embodiment of the present invention. Perspective view of ring member constituting chute Sectional drawing of the strip-shaped board | plate material which comprises a chute | shoot. The schematic diagram which shows the structure of the water addition apparatus to which the chute | shoot which concerns on embodiment of this invention is applied.

  Embodiments of a chute according to the present invention will be described below with reference to the drawings. 1 to 3 show a chute according to an embodiment of the present invention. FIG. 1 is a perspective view of the chute, FIG. 2 is a perspective view of a ring member, and FIG. 3 is a cross-sectional view of a strip-shaped plate material. FIG. 4 is a schematic diagram showing a configuration of a water adding device to which a chute according to an embodiment of the present invention is applied.

<Outline of the shoot>
The chute according to the embodiment of the present invention is an apparatus for receiving and guiding a falling powder or granular material downward, for example, as shown in FIG. It can be used to receive and discharge falling bentonite mixed soil. In the following description, bentonite will be described as a representative example of powder, but the powder to which the present invention is applied is not limited to this, and may be applied to other powders such as cement. it can. The powder targeted by the present invention is solid particles having a particle size of less than about 1 mm. Moreover, the granular material which this invention makes object is a solid particle with a particle size of about 1 mm-about 20 mm.

  As shown in FIG. 1, the chute 100 according to the embodiment of the present invention has a plurality of strip-like plate members 110 having elasticity and flexibility continuously in the circumferential direction, and the diameter of the chute 100 is reduced from the upper side to the lower side as a whole. Are arranged as follows. The strip-shaped plate material 110 is formed of, for example, a rubber plate. Moreover, as shown in FIG. 1, the ring member 120 which has a contractibility is attached so that the outer peripheral surface of the some strip-shaped board | plate material 110 may be enclosed. As shown in FIGS. 1 and 2, the ring member 120 has a ring shape as a whole by connecting two divided metal plates 121 by springs 122. Moreover, as shown in FIG. 3, a sliding member 111 made of a fluororesin (eg, polytetrafluoroethylene) having a small friction coefficient is attached to the inner surface side of each strip-shaped plate member 110.

  In the chute 100 of this embodiment, when the bentonite mixed soil collides with the inner wall surface of the chute 100, a plurality of strip-shaped plate members 110 vibrate due to the impact, and the bentonite mixed soil is shaken down to prevent adhesion. In addition, when the falling bentonite mixed soil collides with the inner wall surface of the chute 100 and the strip-shaped plate member 110 is pushed outward, the ring member 120 presses the strip-shaped plate member 110 from the outer peripheral surface. The plate material 110 does not spread. Furthermore, since the sliding member 111 is affixed to the inner surface side of the strip-shaped plate material 110, the bentonite mixed soil flows down smoothly without adhering to the inner wall surface of the chute 100.

<Hydration apparatus>
As shown in FIG. 4, the hydration apparatus 200 sprays (sprays) fine particle water onto the mixture supply unit 210 that quantitatively supplies the mixture, the dropping unit 220 that freely drops the mixture, and the free-falling mixture. ) Is a device for adding water to the mixture.

  As shown in FIG. 4, the water adding apparatus 200 includes a substantially cylindrical drop unit 220, and a mixture supply unit 210 is disposed above the drop unit 220. The mixture supply unit 210 according to the present embodiment includes a hopper 211, a fixed amount supply device 214 having a screw conveyor 212, a stirring blade 213, and the like, and is bentonite mixed soil 300 that is air-kneaded by a mixing device (not shown). Is stored in the hopper 211, and the bentonite mixed soil 300 is quantitatively dropped into the dropping unit 220 by the quantitative supply device 214. The dropping unit 220 is provided with a diffusing device 221 so as to be positioned directly below the hopper 211. By the diffusing device 221, the bentonite mixed soil 300 spreads concentrically and falls vertically in the dropping unit 220. .

  The dropping unit 220 has a plurality of injection nozzles 231 so as to be positioned inside and outside the bentonite mixed soil 300 that freely spreads concentrically and along the height direction of the dropping unit 220. 230 is provided, and the bentonite mixed soil 300 and water are brought into contact with each other by spraying (spraying) fine particulate water onto the free fall bentonite mixed soil 300. At this time, the spray nozzle 231 is placed at a position where the bentonite mixed soil 300 is sandwiched from inside and outside of the concentric circle so that the bentonite mixed soil 300 during free fall is not scattered by the spray pressure of water. Thereby, the bentonite mixed soil 300 that freely falls in the falling portion 220 is added with water until a desired state is obtained.

<Mixture supply unit>
As shown in FIG. 4, the mixture supply unit 210 includes a hopper 211 provided in the upper part of the dropping unit 220 and a quantitative supply device 214 provided in the lower part of the hopper 211. The hopper 211 may have any shape as long as the bentonite mixed soil 300 can be stored. In the present embodiment, the hopper 211 has a conical shape with a diameter reduced downward, and a discharge port is provided at the lower end. In addition, the shape and capacity | capacitance of the hopper 211 can be suitably changed according to the condition of a processing field, such as the processing amount of the bentonite mixed soil 300 which performs a water treatment.

<Quantitative supply device>
As shown in FIG. 4, the quantitative supply device 214 includes a screw conveyor 212 provided at the lower portion of the hopper 211, and a motor (not shown) for rotationally driving the rotating shaft of the screw conveyor 212. Furthermore, it is preferable to provide a stirring blade 213 for stirring the bentonite mixed soil 300 stored in the hopper 211. The stirring blade 213 is made of reiki attached to the stirring rotating shaft, and is a member for stirring the bentonite mixed soil 300 near the discharge port of the hopper 211 and stably supplying the bentonite mixed soil 300 to the screw conveyor 212. is there.

  In the fixed amount supply device 214, the bentonite mixed soil 300 stored in the hopper 211 is quantitatively discharged from the discharge port by rotating the screw conveyor 212 at a constant speed. The fixed amount supply device 214 is not limited to the screw conveyor 212 and its accessory devices, and any device such as a piston type, a diaphragm type, a plunger type, or a snake type can be used as long as the bentonite mixed soil 300 can be supplied in a fixed amount. Such a structure may be used.

<Falling part>
As shown in FIG. 4, the dropping unit 220 is a cylindrical member placed on a gantry and has a height that allows a predetermined amount of water to be added while the bentonite mixed soil 300 is freely dropped. doing. The shape, diameter, and height of the dropping portion 220 can be appropriately changed according to the situation at the processing site, such as the processing amount of the bentonite mixed soil 300 that performs the hydrotreatment.

<Diffusion device>
As shown in FIG. 4, the diffusing device 221 is a cone-shaped member whose diameter is expanded downward, and is accommodated in a cylindrical diffusing portion 223 provided immediately below the mixture supply portion 210. The bentonite mixed soil 300 supplied from the mixture supply unit 210 spreads concentrically by the diffusion device 221 and freely falls in the dropping unit 220. In addition, a cylindrical skirt portion 222 is provided below the diffusion device 221 in order to spread the bentonite mixed soil 300 concentrically together with the diffusion device 221. That is, the bentonite mixed soil 300 falling from the discharge port of the hopper 211 is concentrically expanded by the cone-shaped diffusion device 221. At this time, the bentonite mixed soil 300 collides with the inner wall of the diffusion portion and bounces back. In order to prevent the 221 from spreading inward from the diameter of the 221, a skirt portion 222 that functions as a buffer portion is provided.

  Note that the diffusion device 221 is not limited to the shape described above, and may have any shape as long as it can diffuse the falling bentonite mixed soil 300, and may have an appropriate shape according to the shape of the dropping portion 220 and the like. can do. The skirt portion 222 is preferably detachable from the diffusion device 221 in order to facilitate maintenance and the like.

<Injection nozzle>
As shown in FIG. 4, the spray nozzles 231 are arranged along the circumferential direction and the height direction of the dropping part 220 so as to be positioned inside and outside the bentonite mixed soil 300 that spreads concentrically and freely falls. Has been. One end of a water supply pipe 240 is connected to each injection nozzle 231, and the other end of the water supply pipe 240 is connected to a compression pump 270. Then, the water stored in the water tank is compressed to a predetermined pressure by the compression pump 270 and supplied to the injection nozzle 231 via the water supply pipe 240, whereby fine particle (mist) water is ejected from the injection nozzle 231. In addition, the diameter of the water particle injected from the injection nozzle 231 of this embodiment is about 10 to 400 μm. Moreover, the pressure of the water to be injected is about 0.05 to 1.0 MPa.

  The spray unit 230 having the injection nozzle 231 is divided into two systems, ie, a substantially central part of the dropping part 220 and an outer peripheral part, and is arranged in multiple stages in the height direction (vertical direction) of the dropping part 220. The injecting unit 230 of the inner system has a plurality of stages (for example, 4 to 8 stages) in the height direction, and the injecting units 230 of each stage are concentric and equidistant from the center of the dropping unit 220 to the outside. A plurality of (for example, 4 to 8) injection nozzles 231 are attached.

  On the other hand, each injection unit 230 in the outer system is arranged at a position facing each injection unit 230 in the inner system. That is, the injection unit 230 having the injection nozzles 231 of the outer system is attached to the water supply pipes 240 having a plurality of stages (for example, 4 to 8 stages) in the height direction. A plurality of (for example, 4 to 8) injection nozzles 231 are attached to each stage of the water supply piping 240 concentrically from the outside of the drop part 220 toward the center. The direction of the injection nozzle 231 is preferably substantially horizontal so that the free fall bentonite mixed soil 300 is not diffused. However, in order to uniformly add water to the bentonite mixed soil 300, it is installed downward or upward. There is also a case.

  In the present embodiment, although not shown in detail, a plurality of dummy injection units 250 that perform injection equivalent to each injection unit 230, a plurality of injection units 230, and a dummy injection unit, corresponding to the plurality of injection units 230, respectively. And a three-way valve 260 for switching between the two. The dummy injection unit 250 has substantially the same configuration as the injection unit 230.

  Then, the amount of water added can be adjusted by adjusting whether or not water is injected from the injection unit 230 for each injection unit 230 of each stage. Specifically, the number of stages of the injection unit 230 to be used may be adjusted by switching the three-way valve 260 provided in the water supply pipe 240 of each injection unit 230 and each dummy injection unit 250. By switching the three-way valve 260, water is injected from either one of the injection units 230 at each stage and the corresponding dummy injection unit 250 at each stage. Thus, since the head balance does not change by switching the flow of water in the injection unit 230 to the dummy injection unit 250, pressure fluctuation and flow rate fluctuation in each injection unit 230 can be suppressed.

  The injection unit 230 of the present embodiment stores a water between the water supply pipe 240 and the injection nozzle 231, and in order to make the water pressure and the amount of water injected from the injection nozzle 231 uniform, a cylindrical water storage unit ( (Not shown). In order to inject (spray) the water stored in this water storage part directly from each injection nozzle 231, the fluid pressure and the flow volume concerning each injection nozzle 231 become equal, and by using a water storage part with a large capacity In addition, water flow turbulence (turbulent flow state) due to bending of the water supply pipe 240, head loss, and the like are unlikely to occur.

  Note that the chute 100 according to the present invention is not limited to the above-described bentonite mixed soil 300 hydrating apparatus 200, but any apparatus as long as it is a device for receiving and guiding a falling powder or granular material downward. Can also be applied. That is, the hydration apparatus 200 of the present embodiment is an apparatus for adding water to the falling powder or granule, but to an apparatus for adding a fluid other than water to the falling powder or granule. Also, the chute 100 of the present invention can be applied. For example, the chute 100 according to the present invention may contain a concrete admixture (a solution such as an air entraining agent, a water reducing agent, a setting / setting modifier, a thickener, a foaming agent / foaming agent) or the like for cement or a cement mixture. It can be applied to a mixed apparatus.

DESCRIPTION OF SYMBOLS 100 Chute | shoot 110 Strip-shaped board | plate material 111 Sliding member 120 Ring member 121 Board | plate material 122 Spring 200 Water supply apparatus 210 Mixture supply part 211 Hopper 212 Screw conveyor 213 Stirring blade 214 Fixed quantity supply apparatus 220 Drop part 221 Diffusion apparatus 222 Skirt part 223 Diffusion part 230 Injection part 231 injection nozzle 240 water supply pipe 250 dummy injection part 260 three-way valve 270 compression pump 300 bentonite mixed soil

Claims (3)

A chute for receiving and guiding the falling powder or granular material downward,
A chute characterized in that a plurality of strip-shaped plate materials having elasticity and flexibility are arranged in a circumferential direction and are arranged so as to reduce in diameter from the upper side to the lower side as a whole.   The chute according to claim 1, wherein a ring member having contractibility is attached so as to surround an outer peripheral surface of the plurality of strip-shaped plate members.   The chute according to claim 1 or 2, wherein the plurality of strip-shaped plate members have a sliding member made of a fluororesin having a small friction coefficient attached to an inner surface thereof.

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