JPS60167830A - Granular powder unloading and feeding apparatus - Google Patents

Abstract

PURPOSE:To reduce power consumption and to attain large unloading and feeding capacity by disposing a rotor with baldes in such a manner as to face a take-in port on casing side below a conveyer casing in an apparatus for unloading and feeding granular powder from a hold. CONSTITUTION:A conveyer 22 and a rotor 32 are rotated to lower the lower end of the conveyer onto granular powder 14 in a hold. Thus, the granular powder 14 is forced to flow in a take-in port 40 by its gravity and accelerated by blades 34 of the rotor 32 to be fed into the case of the conveyer 22 by centrifugal force. At this time, the taken-in granular powder 14 is accelerated to be substantially equal to the peripheral speed of the forward end of the blade 34. Therefore, the rotational frequency of the blade 34 is suitably set to accomplish proper transport. This arrangement can reduce an apparatus to a compact size, reduce power consumption and enlarge unloading and feeding capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a granular material lifting device used mainly for lifting grains deposited in a ship's hold or the like.

[Background technology]

Grains such as wheat are often transported in piles in ship holds, and for this reason, a device for lifting these powders and granules is essential during unloading.

Conventionally, this type of apparatus is known as a pneumatic conveyance type or a mechanical type using a packet conveyor or a case conveyor. The former method sucks the granular material through a nozzle provided at the tip of a vertical transport pipe, but it has the disadvantage of extremely high power consumption.

Packet conveyors have a structure in which multiple packets are lined up on the conveyor and pulled up in sequence, and are advantageous in that they consume less power and have less power loss due to friction than pneumatic transport types. Since the interval between packets is large and the speed at which the packets are separated cannot be increased very much, the device must be enlarged to ensure sufficient transport capacity.

The case conveyor lifts powder by running a chain equipped with a scraping device inside a vertical case, and has the advantage that the lifting device can be made into a continuous structure because the filling rate in each case can be increased. but.

It has the disadvantage that it cannot be applied to powders with high fluidity.

In addition, there is a disadvantage that the case and chain wear out rapidly and power loss due to friction increases.

In order to solve this problem, the present applicant installed a finned conveyor that rotates in the vertical direction, and sent the powder and granules to the conveyor by the rotating centrifugal force of a rotor directly below this conveyor for scraping up the powder and granules. An application has been filed for a lifting device (Japanese Patent Application No. 57-209972).

Although the power loss of the lifting device has been slightly improved by this prior invention, the friction loss from taking in the powder to scraping it up is large, so the power required for rotation of the O-ring is large. There is a drawback. In addition, with the conventional device and the device of the prior application, when there are few particles left in the hold, it is difficult to lift up every last particle.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to provide a powder and granule material lifting device that can exhibit a large lifting capacity with a compact device with low power consumption. It's about doing.

[Structure of the invention]

In order to achieve the above object, the present invention installs a rotor with blades below a casing that covers the conveyor, and forms an intake port for powder and granules on the side of the casing, so that the powder and granules are transferred to the rotating blades. The structure is such that powder particles can be accelerated by flowing in from the inside.

[Embodiments of the invention]

FIG. 1 shows a lifting device 10 according to the present invention, in which powder and granular material 14 is deposited in a hold 12 of the ship.

This lifting device 10 includes upper and lower rotating drums 16.degree. 18, and the upper rotating drum 16 is rotated counterclockwise by a drive member 20. Further, a conveyor 22 is installed between the rotating drums 16 and 18.

As the rotating drum 16 rotates, it rotates counterclockwise.

As shown in FIG. 2, the conveyor 22 consists of a belt 24, a pair of side plates 26 and 26'f, which are provided upright on both edges of the belt 24.
! : A large number of cases 30 are formed along the conveyor 22 and are configured by a plurality of transverse fins 28 and receive the powder 14 . This is because the side plate 26 has flexibility and is installed in a wave shape.

The conveyor 22 can be turned over without any problem even at the upper and lower ends. The fins 28 do not necessarily have to be fixed at right angles to the belt 24, but may be inclined upwardly or
As shown in the figure, it may be bent upward from the middle. With this configuration, the powder filling rate of the case 30 can be improved.

A rotor 32 is arranged directly below the conveyor 22, as shown in FIGS. 4 and 5. A plurality of blades 34 extending in the radial direction are fixed to the outer side of the rotor 32, and as shown in FIG. 6, the width dimension W□ of each blade 34 is larger than the axial dimension W2 of the blade 34.

On the other hand, the conveyor 22 and rotor 32 are covered with a casing 36 that extends in the vertical direction, as seen in FIG. The casing 36 has a discharge port 38 for the powder and granular material 14 at its upper end.
An intake port 4o is provided at the lower end. As shown in FIG. 4, a pair of intake ports 4o for the granular material 14 are formed on both sides of the casing 36 in the rotor axial direction, and the diameter thereof is approximately the same as the inner dimension of the blade 34.

With this configuration, the powder 14 flowing from the intake port 40 through the inside of the blade 34 is accelerated by the blade 34 and discharged upward by centrifugal force. Since the vane 340 is covered in the radial direction by the casing 36, the powder 14 will not be scattered.

Incidentally, according to an experiment using wheat as the powder 14,
The intake port has a diameter of 400mm, the diameter of the rotor 32 is 165mm, the width is 200mm, the width is 20mm, and the height is 25mm, and the capacity is approximately 25 tons.
/h of wheat could be transported, and the power consumption of the rotor 32 at this time was 0.2 KW.

It is desirable to determine the size of the intake port 40 based on the inflow amount of the powder 14 experimentally, and the balance between the lifting capacity of the lifting device 10 and the inflow amount of the powder 14 is determined by the height of the blade 34. Dimensions (
(radial length).

The lifting device 10 of this embodiment configured as described above operates as follows. First, the lifting device 1o is lifted up by a crane or the like (not shown), and the conveyor 22 and rotor 32 are
is rotated, and its lower end is dropped onto the granular material 14 in the hold 12. Since the intake port 40 below the Kelsong is open, the powder 14 flows into the intake port 40 under the force of gravity.

The granular material 14 is accelerated by the blades 34 of the rotating rotor 32 and is moved to each case 3 of the conveyor 22 by centrifugal force.
sent to 0. The powder 14 in the case 30 is conveyed upward by the conveyor 221C.

It is discharged outside from the outlet after 3 days.

At this time, the powder 14 flowing in from the intake port 40 is transferred to the blade 3
Since it is accelerated until it becomes almost equal to the tip circumferential speed of the powder 14-2, if the number of revolutions of each blade 34 is appropriately set, a sufficient conveyance speed can be given to the powder and granular material 14-2. Powder 14 is the blade 3
The rotation angle of the vane 34 from when it flows into the tube 4 until it is discharged is about 90 degrees, as seen from FIG. 7 (6). on the other hand,
When the intake port is installed on the outer periphery of the blade 34 as in the device of the prior application, this angle becomes extremely large as shown in FIG. 7(4).

Therefore, in the lifting device 10 of this embodiment, the friction loss is reduced by the above-mentioned angular difference, and power consumption is also saved by that amount.

FIG. 8 shows a comparison of the power consumption of the device of the prior application and the device of the present invention, where the horizontal axis is the circumferential speed of the rotor 32 (m/3), and the vertical axis is the power consumption (Wh/l). It will be understood from this figure that the power consumption of the device of the present invention is less than half that of the device of the prior application.

If reinforcing rings 37 are provided at both ends of each blade 8134 as shown in FIGS. 9 and 10, the strength of the nine blades 340 can be improved without impairing the above-mentioned functions.

FIG. 11 shows another embodiment of the present invention.

Two rotors 32 are installed in the axial direction, and intake ports 40 for the granular material 14 are formed below the casing 36 on both sides of the rotor in the axial direction.

This allows the individual rotors 32 and blades 34 to be more compact, as well as increasing the number of intake ports 40.

Further, the intake port 40 may be formed as shown in FIGS. 12 and 13 as long as it is within the side surface area of the rotor 32. 12th
13, the intake port 40 is biased toward the discharge start point shown in FIG. 7, so the distance from the inflow point to the discharge start point is shortened on average, making it possible to reduce friction loss. .

Furthermore, as shown in FIGS. 14 and 15.

Even if the intake port 40 is circular, a rectifying plate 39 is installed to bring the average inflow point closer to the discharge start point.

Similar effects can be expected.

FIG. 16 shows an embodiment in which a chute 42 is connected to one side of the intake port 40. In the device of the prior application, the intake port has 34 blades.
Because it is formed on the outer periphery of

Chute 42 cannot be used. but.

In this embodiment, since the intake ports 40 are formed on both sides of the casing 36, the chute 42 can be connected, and the powder and granules 14 remaining on the floor 46 of the hold can be removed with a shovel 44''!
By means of a bamboo vacuum or the like, the bottom of the powder and granular material 14 in the hold can be easily dredged down to the last grain.

〔Effect of the invention〕

As mentioned above, in the present invention, a rotor with blades is installed below a casing that covers a conveyor, and intake ports for powder and granular material are formed on both sides of the casing in the rotor axis direction to rotate the powder and granular material. Since it is configured to flow from the inside of the blade, it is possible to downsize the lifting device and reduce power consumption.

[Brief explanation of the drawing]

FIG. 1 is a simplified sectional view showing the entire lifting device according to the present invention, FIG. 2 is a perspective view of the conveyor, FIG. 3 is a sectional view of the conveyor, and FIG. 4 is a side view of the vicinity of the rotor. Fig. 5 is a cross-sectional view taken along the v-■ arrow in Fig. 4, Fig. 6 is an explanatory diagram showing the rotor and blades, Fig. 7 (4), and ■ are powder grains in the rotor comparing the present invention and the prior application device. A hypothetical diagram of centrifugal acceleration distribution of the body, Figure 8 is a graph comparing the power consumption of the present invention and the device of the prior application, Figures 9 and 10 are side views showing an example in which reinforcement is provided at both ends of the blade. , Fig. 11 is a longitudinal sectional view showing an embodiment using multiple rotors, Figs. 12 and 13 are side views showing other embodiments of the intake port shape, and Fig. 14 is a case where a rectifying plate is installed. 15 is a side view of FIG. 14, and FIG. 16 is a simplified sectional view showing an embodiment in which a chute is connected to the intake port. 10... Lifting device 12... Ship Hold 14... Powder 22... Conveyor 28... Fin 30... Case 32... Rotor 34... Vane 36... Casing 38...Discharge port 4o...Intake port. Figure 9 Figure 10 Figure 11 Figure 2

Claims (1)

[Claims] (1) A pair of rotating drums arranged above and below, and a finned conveyor installed between the two rotating drums. A powder intake port covers the conveyor and is located below. a casing having a discharge port formed in the upper part; a rotor disposed directly below the conveyor for supplying the granular material to the conveyor by rotating centrifugal force; and a plurality of blades formed on the outer surface of the rotor to accelerate the granular material. A powder and granular material lifting device comprising the above-mentioned blade rotor is housed in a casing, and an intake port for the powder and granular material is formed to open toward the axial direction of the rotor of the casing. Powder and granule material lifting equipment.