JPH0814460B2 - Grain draft dryer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a grain draft dryer, which can be used in a rice and wheat dry storage plant, a grain dryer, and the like.

2. Description of the Related Art Conventionally, it has been important to prevent grain unevenness by uniformly supplying the grains to the grain storage tank during ventilation drying of the grains, and to provide uniform drying of the storage tank. There is an invention example as disclosed in JP-A-59-183282, for example, in which the bottom plate provided is an inclined surface which substantially matches the angle of repose of the grain.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention When the bottom plate portion of the storage tank is provided in a funnel shape having a shape like a cone or a quadrangular pyramid, when grains are radially supplied from the upper center portion of the storage tank, the vicinity of the tank peripheral edge becomes relatively large. Although the grain deposition surface is along the inclined surface of the bottom plate, there is a problem that the grain layer thickness becomes thick due to grain flow-down from the periphery in the central portion.

Means for Solving the Problem The present invention is to form a funnel-shaped bottom plate 3 surface through which a bottom portion of a storage tank 2 accommodating a grain 1 can be ventilated, and supply the grain 1 from a central portion above the storage tank 2 to provide the bottom plate 3 surface. In the grain ventilation dryer configured to discharge the grains from the central portion, a grain sensor 4 that detects a predetermined amount of stored grains and stops the supply of the grains at a predetermined position on the peripheral wall of the storage tank 2. A grain sensor 5 is provided below the central portion of the storage tank 2 and is activated when the grain layer thickness from the surface of the bottom plate 3 becomes substantially uniform and stops grain discharge. The structure of a grain ventilation dryer characterized by the above.

Effect of the Invention In the above-mentioned configuration, the grain 1 from the upper center of the storage tank 2
, The grains 1 fall onto the funnel-shaped bottom plate 3 surface, flow down on the bottom plate 3 surface, accumulate from the central portion, and sequentially spread in the peripheral direction. When the supply of the grain 1 is continued, the grain sensor 4 provided on the peripheral wall of the storage tank 2 detects that the supplied grain 1 has reached a predetermined amount, and stops the grain supply.

Next, when the grains are discharged from the discharge port provided in the central portion of the bottom plate 3 surface of the storage tank 2, when the grain 1-layer surface in the central portion gradually sinks and the grain sensor 5 is exposed on the surface. Then, the sensor 5 is activated to stop the discharge of the grain 1. In this state, the grain layer thickness a from the bottom plate 3 surface is substantially uniform, and thereafter, the grain is dried by ventilation from the bottom plate 3 surface to the grain 1 layer by the ventilation means.

EFFECTS OF THE INVENTION The present invention has a grain sensor 4 provided on the peripheral wall of the storage tank 2 and a grain sensor 5 provided below the central portion of the storage tank 2 as described above.
The layer thickness of the grain 1 put into the storage tank 2 can be made substantially uniform by means of, and as a result, the ventilation from the surface of the bottom plate 3 becomes uniform, and the ventilation drying is performed in a very good state without unevenness in drying. Can be done.

Example In the drawings, the grain (1) is exemplified by paddy, and a ventilation drying device for the paddy is exemplified and described.

The storage tank (2) has a rectangular tubular portion (7) having four side plates (6) formed in a rectangular planar shape, and a four-sided bottom plate (3) portion forming a pyramidal funnel shape integrally formed on the lower portion. The storage tank (2) is connected to the storage tank (2) and a plurality of tanks (2) (2) ... The air passage is sealed and placed on the air passage base (9) forming the provided air passage.

Each bottom plate (3) is provided with a large number of transverse cuts, and both end edges sandwiching these cuts are bent in a lateral shape by bending one side edge downward and the other side edge upward. A structure in which a large number of air holes (10) are arranged to form a so-called sweep floor, and the static air pressure in the air duct base (9) is ejected into the storage tank (2) from the air blow holes (10). Is. The funnel-shaped bottom plate (3) has a central lower end formed in a flat surface and is provided with a discharge port (12) having an opening / closing valve (11). ) Is guided by a funnel and conveyed by a discharge rotation conveyor (1
3) is provided. Further, a tension conveyor (14) is mounted on the upper part of the storage tank (2) along the series direction of the tank. A leveling supply device (15) that reciprocates along the longitudinal direction of the conveyor (14) to uniformly supply the grains (1) from the left and right of the conveyor (14) to each tank (2). It is provided. This stretch conveyor (14) receives the supply of the grain (1) received by the cargo receiving section from the elevator (16),
The elevator (16) is configured to receive the grain from the discharge rotation conveyor (13) and rotate the grain (1) in the tanks (2) (2).

The grain sensor (4) is a pressure switch that receives pressure from the weight of the grain (1) and detects the level of the grain (1) housed in the tank from the leveling and feeding device (15). , Input the detection information to the control unit, elevator (16),
The configuration is such that the driving of the stake-in conveyor (14) and the like is stopped. The position of the grain sensor (4) is configured to be able to detect that a predetermined grain layer pressure (a) near the upper end of the inclined bottom plate (3) is obtained.

The grain sensor (5) is at the center of the storage tank (2) and at a predetermined height (H) position above the discharge port (12), and passes through the grain sensor (4) position to the bottom plate ( It is located on a line along the inclination direction of 3) and is provided in the same pressure switch form as the sensor (4), and the grain sensor (4) detects the grain (1) and turns on the switch to control. Equipment is grain (1)
When the supply of the is stopped, the grain sensor (5) is buried in the grain (1) and is in the switch ON state.

The elevator (16) raises the received grain (1) or the rotated grain (1), and the leveling and feeding device (15) is moved to a predetermined position.
In the storage tank (2), the leveling and feeding device (15) distributes it to the left and right of the conveyor (14), and the slanted chute part slides down to make a semicircular dispersion by the circular diffuser at the tip part. Supply to fall. The falling grain (1) flows down from the inner peripheral wall of the storage tank (2) along the inclined surface of the bottom plate (3) and is gradually collected, and the surface of the grain layer is kept in the tank (2) to maintain its angle of repose. ) The grain layer thickness (a) in the central part becomes thicker than that in the outer peripheral part by flowing down from the four sides to the central part. When the grain sensor (4) receives pressure from the weight of the grain (1) and turns on, the elevator (16), the stake conveyor (14), and the discharge rotation conveyor (13) are controlled by the control device. After stopping and then opening the on-off valve (11) and discharging the grain (1) from the discharge port (12) onto the discharge rotation conveyor (13), the collected grain (1) tank (2) center The surface of the part sinks, the grain sensor (5) is exposed, and the switch is turned off (or turned on), whereby the on-off valve (11) is controlled and closed. At this time, the ventilation grain layer thickness (a) becomes a uniform layer thickness (a) substantially along the inclination of the bottom plate (3). In this way, the pressure fan (8) is rotated, and the pressure air in the air duct base (9) is ventilated from the blowhole (10) to the grain (1) layer to uniformly dry the grain (1) in the tank. You can get the status.

As described above, the conventional problem can be easily solved by the unprecedented means of discharging a part of the grains (1) to obtain a uniform ventilated grain layer thickness (a).

The storage tank (2) may be provided in a cylindrical shape, and the bottom plate (3) may be provided in a conical shape.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention. FIG. 1 is a side view, FIG. 2 is a plan view thereof, and FIGS. 3 and 4 are operational views. In the figure, reference numeral (1) indicates a grain, (2) indicates a storage tank, (3) indicates a bottom plate, (4) indicates a grain sensor, and (5) indicates a grain sensor.

Claims (1)

[Claims] Claim: What is claimed is: 1. A funnel-shaped bottom plate (3) which can ventilate a bottom of a storage tank (2) for accommodating grains (1). In the grain ventilation drying device configured to discharge, a grain sensor 4 for detecting a predetermined amount of stored grains and stopping the supply of the grains is provided at a predetermined position on the peripheral wall of the storage tank 2, and the storage is also performed. Below the central portion of the tank 2, a grain sensor 5 that is activated when the grain layer thickness from the surface of the bottom plate 3 becomes substantially uniform and stops the discharge of grains.
A grain ventilation drying device characterized by being provided with.