JPS6143782Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a grain discharge device in a grain drying device.

[Prior art]

In order to repeatedly dry the grains, a rising conveyor tube is installed on one side of the dryer box, and the structure is such that it communicates with the top of the dryer box to dry the grain while circulating it.When the drying is finished, this rising conveyor tube The circulation to the upper part of the machine box is cut off by switching the valve midway, and the grain rising passage is switched to the side of the discharge pipe which is connected as appropriate (for example, Japanese Patent Publication No. 53-13547).

[Problem that the invention attempts to solve]

However, in the above embodiment, when the discharge tube is filled with grains, the filled grains enter the ascending conveyance tube and clog the conveyance tube, which in turn causes the lower conveyance spiral body to stop, which is dangerous.

[Means to solve the problem]

This invention solves the above-mentioned drawbacks by installing a suction blower 21 on the top of the dryer box 1, which is equipped with a rising conveyor cylinder 2 on the side, and blowing hot air to the circulating grains by the suction negative pressure of the blower 21. In a grain drying device that dries grain by passing through it, a discharge joint 3 that communicates with the outside of the machine is connected to the upper part of the conveying cylinder 2, and the joint 2 and the upper space 7' of the machine box 1 are tightly closed under negative pressure. The flexible communication tube 5 connects the transfer tube 2.
The grain discharge device in the grain drying device is provided with a switching valve 20 for switching communication to the upper space 7' side of the machine box 1 or the discharge joint 3 side.

[Effect of invention]

The switching valve 20 of the ascending conveyance cylinder 2 is switched in advance so that the ascending passage communicates with the upper space 7' of the box 1.
The grains put into dryer box 1 are
It is exposed to hot air that flows down through the interior and rises due to the negative suction pressure of the suction blower 21, and is dried. The grains reach the ascending transport tube 2 from the lower part of the machine box 1, rise and return to the machine box 1, where they are again subjected to drying action. At this time, the flexible communication cylinder 5 receives the negative pressure from the suction blower 21, so it is automatically tightly closed, and there is no fear of outside air being introduced and the hot air suction efficiency of the suction blower 21 is not reduced.

When a predetermined moisture level is achieved by repeating such a drying operation, the switching valve 20 is switched to connect the grain rising passage to the discharge joint 3 side. The grains transported upward are collected outside the machine through a discharge joint 3 and a downstream discharge tube 4 connected thereto. When a container such as a collection tank appropriately arranged at the bottom of the downstream discharge tube 4 is filled with grains, the downstream discharge tube 4 and the discharge joint 3 tend to become clogged, but the discharge joint 3 and the upper space 7 of the machine box 1 are clogged. ′ is connected with the flexible communication tube 5,
Moreover, during the grain discharge operation, the suction blower 21 is stopped and the inside of the machine box 1 is not in a negative pressure state, so the flexible communication cylinder 5 is maintained in a conductive state and the above-mentioned filled grains are returned and flowed down into the machine box 1. .

[Effect of idea]

In this way, when the upper part of the machine box 1 is maintained at a negative pressure by the suction blower 21 operated during drying work, the flexible communication tube 5 is automatically closed tightly to prevent a decrease in the suction power of the blower. If the discharge part is clogged by switching the switching valve 20 and proceeding to the discharge operation, the system returns to the cylinder communication state and allows the filled grains to flow back down, and no special switching operation is required. This eliminates erroneous operations and saves labor.

〔Example〕

An embodiment of this invention will be described based on the drawings.

Reference numeral 1 designates a dryer box, the upper part of which is formed into a grain storage chamber 7, and the loaded grains in this grain storage chamber 7 are handled by perforated grain flow guide plates 8, 8 on the left and right and an inverted V-shaped non-perforated grain flow guide in the center. It is configured so that it is guided down by the inclined plate 9 and reaches the drying chambers 12, 12 on the left and right sides of the lower part. The drying chambers 12, 12 are formed into narrow passages by the downward extensions of the perforated guide plates 8, 8 and the perforated plates 10, 10 facing thereto. 11 is a perforated plate 10,1
This is a warm air or dry air supply chamber that is formed between 0 and 3 and communicates with a warm air blower box 23 provided on the side wall of the machine box 1.

Reference numerals 14 and 14 designate rotary valves disposed in the grain collection chamber 13 at the bottom of each of the drying chambers 12 and 12, which are configured to rotate at low speed in a fixed direction to feed out grains in predetermined amounts. Reference numeral 15 is a screw conveyor installed horizontally at the bottom of the outlet 13, which can collect grains reaching the grain collection room 13 and transfer them to one side.

On one side of the dryer box 1, an ascending conveyance tube 2 is provided upright. The lower part of the ascending conveyance cylinder 2 is connected to a connecting passage 18.
The rotary vane 16 is connected to one side of the lower part of the grain collection chamber 13 through the upper part of the upper part of the grain collection chamber 13, and a rotary vane 16 fixed to one end of the shaft 17 of the screw conveyor 15 is located in the lower part of the ascending conveyance cylinder 2. Note that this conveyor shaft 17 is configured to be rotationally interlocked so that the speed can be changed to high or low.

Reference numeral 19 denotes a connecting passage that communicates the above-mentioned ascending conveyance cylinder 2 with the grain storage chamber 7 at the upper part of the machine box 1, and a switching valve 20 is provided in the ascending conveyance cylinder 2 to communicate or cut off the connection passage 19.

Reference numeral 3 denotes a joint that is connected to the upper part of the ascending conveyance tube 2 to form a discharge passage, and is curved in an inverted U shape, and the end thereof is connected to a grain-flowing discharge tube 4 to communicate with the outside of the machine. A hopper 6 is formed in the middle of the joint 3, and the hopper 6 and the upper space 7' of the grain storage chamber 7 are communicated by a flexible communication cylinder 5 made of soft polyvinyl chloride or the like.

In the upper part of the grain storage chamber 7, on one side of the upper space there is a suction blower 2 for sucking and discharging internal air.
1 is provided. Due to the draft of the suction blower 21, the dry air in the dry air supply chamber 11 is transferred to the perforated plate 1.
0 and 10 into the grain storage chamber 7, a part of which passes through the grain flow guide perforated plates 8 and 8, and enters the rotary valve 1.
4 and 14, and reaches the grain collection chamber 13, allowing the ascending conveyance cylinder 2 to rise.

22 is a hopper for feeding grains.

The effect of the above example will be explained.

The switching valve 20 is set as shown in the imaginary line in FIG.
A connecting passage 19 is opened. The grains from the grain supply hopper 22 are pushed up into the grain storage chamber 7 by the lifting action of the rotary blades 16 rotating at high speed.

When a certain amount of screws are applied, the drying operation starts. During the drying operation, the suction blower 21 and other rotating parts are driven, but the shaft 17 of the screw conveyor 15 is rotated at a low speed. The grains in the grain storage chamber 7 are dried as they gradually flow down as dry air rises between the grains (arrow b) due to the draft of the suction blower 21. The grains fed out by the rotary valves 14, 14 are transferred to the grain collection chamber 13.
When it reaches this point, it flows down and is transferred to the ascending conveyance tube 2 side by the screw conveyor 15. Rising conveyor tube 2
Inside, the negative pressure action of the suction blower 21 or the auxiliary conveyance action of the rotary blades 16 work to return the grains to the upper storage chamber 7 where they are gradually cooled.

Such a drying action is repeated until a predetermined moisture content is reached and the drying is completed. When taking out dried grains outside the machine, the switching valve 20 is set to switch the grain storage chamber 7.
The connecting passage 19 to the joint 3 is closed, and the discharge passage leading to the joint 3 is opened. When the shaft 17 of the screw conveyor 15 is rotated at a high speed, the grains that have been guided downward in the machine box 1 and reached the ascending conveyance tube 2 are gradually raised by the forceful conveying action of the rotary vanes 16, and the grains are discharged to the joint 3. It is taken out of the machine through tube 4.

During the above-mentioned discharge operation, the take-out tank outside the machine or the downstream discharge pipe 4 is filled with grains, and the joint 3
When the grains are about to be filled, they flow down the flexible communication tube 5 from the hopper 6 and are returned to the storage chamber 7, thereby preventing the grains from falling back into the ascending conveyance tube 2.

During the drying process, the intermediate portion of the flexible communication tube 5 is always tightly closed due to the negative pressure action of the suction blower 21, so that a decrease in efficiency due to external air suction can be automatically prevented.

[Brief explanation of the drawing]

The figures show one embodiment of this invention; Fig. 1 is an overall perspective view, Fig. 2 is a vertical sectional view of Fig. 1, and Fig. 3 is a longitudinal sectional view of Fig. 1.
The figures are sectional views taken along line A-A in Figure 2, Figures 4 and 5.
The figure is an explanatory diagram of the action. In the figure, 1 is a dryer box, 2 is a rising conveyance tube, 3 is a discharge joint, 5 is a flexible communication tube, 7' is an upper space, 2
0 indicates a switching valve, and 21 indicates a suction blower.

Claims (1)

[Scope of utility model registration request] In the grain drying apparatus, a suction blower 21 is provided at the top of the dryer box 1 equipped with an ascending conveyance tube 2 on the side, and the grains being circulated are dried by passing warm air through the suction negative pressure of the blower 21. A discharge joint 3 that communicates with the outside of the machine is connected to the upper part of the cylinder 2, and the joint 2 and the upper space 7' of the machine box 1 are connected by a flexible communication cylinder 5 that can be tightly closed in response to negative pressure.
A grain discharge device in a grain drying device, in which a transfer cylinder 2 is provided with a switching valve 20 for switching communication to the upper space 7' side of the machine box 1 or to the discharge joint 3 side.