JPS6120475Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a circulation type grain drying method that circulates and flows the grains put into the grain tank, and generates hot air from a hot air generator (furnace) and supplies it with a blower to dry the grains. The present invention relates to a safety device for preventing partial overdrying caused by malfunction of grain circulation in a drying device.

More specifically, the circulation type grain dryer targeted by the present invention is, for example,
As stated in Publication No. 77796, the grain loaded in the grain tank is controlled to a predetermined flow rate by the operation of a rotary shutter mounted on the bottom of the grain tank, and is discharged to the outside of the grain tank.
By lifting the grains with a grain lifting machine installed vertically on the outside of the machine and returning them to the upper part of the inner cavity of the grain tank,
The grains are made to flow down the grain flow path at the bottom of the grain tank at a predetermined flow rate, and the hot air generated in the furnace is sent to the grain flow path by the operation of the blower. This is a circulation-type grain drying device that dries the grains flowing in the grain flow passage by blowing hot air at them.

In conventional circulation-type grain drying devices of this type, the control of the drive mechanism of the rotary shutter and the operation of the hot air generator were performed separately, so the operation of the rotary shutter was controlled separately. When malfunction occurs, an abnormally large amount of hot air is supplied to the grains located in the grain flow path.
There is a problem of local over-drying.

The present invention was devised to solve this problem, and when a malfunction occurs in the operation of the rotary shutter, the operation of the hot air generator that generates hot air is stopped, thereby partially resolving the problem. The purpose of the present invention is to provide a new means for reliably preventing excessive drying.

In the present invention, as a means for achieving this purpose, a rotary shaft of a rotary shutter mounted on the bottom of a grain tank into which grains to be dried are placed, or a rotary shaft that rotates in conjunction with the rotary shaft, An actuating piece that rotates in synchronization with the rotation axis is provided, and a switch is provided in the rotation locus of the actuating piece to repeat the "on" and "off" operations as the actuating piece approaches and moves away, and the grain tank is tensioned. An interval switch that turns on and off the electric circuit that controls the operation of the hot air generator that generates the hot air that is sent to the loaded grains when a signal is sent within a desired set time. The interval switch is controlled by an "on" or "off" signal transmitted from the switch, and the time set in the interval switch is controlled by the switch. This invention proposes a safety device in a circulating grain drying device, characterized in that the interval time of the "on" or "off" signals transmitted by the grain drying device is set to be longer than the interval time of the "on" or "off" signals transmitted by the machine.

Next, an example of implementation will be described in detail with reference to the drawings.

In Figure 1, A is a circulating grain dryer;
A grain tank 10 with left and right side walls 10a... and a bottom wall 10b as air permeable partitions such as nets is mounted on the upper side of the inner cavity of the box-shaped body 1, and inside the grain tank 10, Grain is loaded with an elevator 11 (bucket elevator) installed on the outside of the machine body 1 and a conveyor 12 for loading horizontally hung on the ceiling of the machine body 1, and the grain is placed at the bottom of the grain tank 10. From the outlet 13 to the outlet 1
A drum shutter 2, which is a rotary shutter mounted on a shaft, is operated to control and discharge the grains at a constant flow rate, and the discharged grains are transferred to the machine by a discharge conveyor 14 provided at the bottom of the inner cavity of the machine body 1. The grain is carried outside and sent to the bottom of the above-mentioned elevator 11, and returned to the inside of the grain tank 10 by the elevator 11 for circulation.In the center of the inner cavity of the grain tank 10, there is a breathable partition wall 15a such as a mesh. As shown in FIG. 5, an air guide path 15 consisting of
The hot air (dry air) generated by the hot air generating device 3 installed on the outer surface of the grain tank 10 is sent, and the hot air is blown across the inner cavity of the grain tank 10 as shown by the arrow in FIG. This is a conventionally known method in which the circulating and flowing grains are exposed to hot air (drying air) and dried.

By the way, as shown in FIG. 2, the drum shutter 2 (or valve shutter) described above is formed into a drum shape with a peripheral wall 20 formed into a hollow cylindrical shape. As shown in Fig. 3, the outlet 13 is closed by the circumferential wall 20 by being disposed so as to be in sliding contact with the mouth edge of the outlet 13, and the circumferential wall 20 has a slit-shaped slit along the axial direction. The opening 21 is connected to the peripheral wall 2.
A rotary shaft 22, which is provided at one location in the circumferential direction of the machine body 1 and protrudes from both ends in the axial direction, is mounted on the machine body 1 and driven to rotate, and is positioned in the grain tank 10 of the slit-shaped opening 21. By rotating the opening 21 and exposing it to the outside from the discharge port 14 and opening it downward, the grains flowing into the inner cavity of the drum shutter 2 from the opening 21 are discharged. The rotating shaft 22 serves as a feeding roll that sequentially feeds out the grains in 10.
By rotating the pump at a constant speed, the outflow amount is regulated to a predetermined amount.

Due to the rotation of this drum shutter 2, S is
This is a switch that is installed to repeat "on" and "off" operations at fixed intervals depending on the rotational speed of the drum shutter 2. As shown in FIG. 4, the circumferential surface of a disc-shaped rotating metal body 41 fitted via a boss portion 40 to the rotating shaft 22 may be any other suitable rotating shaft that rotates in synchronization with the rotating shaft 22. an actuating piece a made of a metal member formed into a protrusion;
The actuating piece a rotates and comes close to the proximity switch b, which is arranged so as to face the rotation locus W when the actuating piece a is rotated by the rotation shaft 22. Then, when the drum shutter 2 rotates, the proximity switch b senses it by magnetic force and turns on, and turns off when the actuating piece a moves away. The operation is repeated from "on" to "off" or from "off" to "on" after a certain period of time.

I turns on the operation of the hot air generating device 3 described above.
This is an interval switch provided to control an electric circuit that is turned off. In this embodiment, the hot air generator 3 is a blower 30 operated by a motor M
and a furnace (burner device) 32 that burns the fuel supplied by the pump P through the fuel pipe 31. Therefore, the above-mentioned electric circuit is installed in the middle of the fuel pipe 31. The interval switch I is connected to this circuit as shown in FIG. 6. The interval switch I operates "on" when an input signal is input, and thereby maintains the "on" state for a preset period of time, but if another input signal is input during this operation, This is a conventionally known timer (or interval timer) that starts measuring a new set time when that signal is received. Then, the switch S is connected to the interval switch I so that the start of the interval switch I is controlled by a signal from "on" to "off" or from "off" to "on" transmitted from the switch S. However, in this case, the time set for the interval switch I is longer than the operation interval in which the switch S repeats "on" and "off" when the drum shutter 2 is rotating at a predetermined speed. , is set for a long time.

33 is a fuel tank, and 34 is a wind cylinder which also serves as an outer casing of the hot air generating device 3.

The thus constructed embodiment device operates as follows.

In the above embodiment device, the drum shutter 2
The time required for one rotation of the switch S is set to 10 seconds, so that when the switch S repeats the operation from "on" to "off" or from "off" to "on",
Assume that the interval of its operation is set to 10 seconds, and that the interval switch I is started by the signal of the change in operation from "on" to "off" transmitted from the switch S, and Assume that the time set in advance as a timer on switch I is set to 30 seconds, which is several times the time of 10 seconds.

Then, when the drum shutter 2 is rotating correctly at a predetermined speed, the interval switch I is turned on every 10 seconds before the set time (30 seconds) has elapsed. Since signals to turn on the valves are input one after another, the electric circuit of the solenoid valves S and V installed in the middle of the fuel supply pipe 31 that supplies fuel to the furnace 32 of the hot air generator 3 is connected to the interval switch described above. I will be controlled to be in the “on” state continuously,
As a result, the furnace 32 continues its predetermined operation.

In this state, if the rotation of the drum shutter 2 becomes malfunctioning or stops rotating, the interval of the signal sent from the switch S to the interval switch I becomes longer or is interrupted, and the interval switch I During the set time of 30 seconds, the signal for starting is no longer input to the interval switch I, and the interval switch I turns "off", thereby closing the solenoid valves S and V. , the operation of the furnace 32 is stopped.

In this embodiment, when the operation of the drum shutter 2, which is a rotary shutter, malfunctions or stops, only the operation of the furnace 32 is stopped, and the other operating parts continue to operate. However, the operating parts such as the blower 30, elevator 11, loading conveyor 12, and unloading conveyor 14 are automatically controlled to stop operating after a certain period of time after the furnace 32 stops operating. In some cases, the operation of the furnace 32 is stopped based on a signal when the above-mentioned interval switch I is turned "off", and the operation of each operating section is also stopped after a certain period of time.

As explained above, the safety device in the circulating grain dryer according to the present invention is the rotating shaft of the rotating shutter mounted on the bottom of the grain tank into which the grains to be dried are placed, or the rotating shaft rotating in conjunction with the rotating shaft. On the rotation axis,
An actuating piece that rotates in synchronization with the rotation axis is provided, and a switch is provided in the rotation locus of the actuating piece to repeat the "on" and "off" operations as the actuating piece approaches and moves away, and the grain tank is tensioned. An interval switch that turns on and off the electric circuit that controls the operation of the hot air generator that generates the hot air that is sent to the loaded grains when a signal is sent within a desired set time. The interval switch is controlled to be operated by an "on" or "off" signal transmitted from the switch, and the time set in the interval switch is controlled by the switch according to the rotation of the rotation shaft. “On” or “Off” to make a call
Since the configuration is set to be longer than the interval time of the signal, if the rotary shutter malfunctions, the operation of the hot air generator will definitely stop, causing malfunction of the rotary shutter. In addition, the problem of partial overdrying of grains that occurs when the grain is stopped can be reliably prevented.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of a circulating grain drying device in which the present invention can be implemented, Fig. 2 is a perspective view of the drum shutter of the same device, and Fig. 3 is a longitudinal sectional front view of the drum shutter portion of the same device. FIG. 4 is a perspective view of the main parts of the device, FIG. 5 is an explanatory diagram of the device of the present invention, and FIG. 6 is an explanatory diagram of the circuit. Explanation of drawing symbols, A... Grain dryer, 1... Body, 10... Grain tank, 11... Lifting machine, 12... Conveyor for tensioning, 113... Discharge port, 14... Conveyor for carrying out, 15... Air guide path, 2... Drum shutter, 22... Rotating shaft, 3... Hot air generator,
30...Blower, 31...Fuel supply pipe, 32
...Furnace, 33...Fuel tank, S/V...Solenoid valve, S...Switch, a...Actuation piece, b...Proximity switch, I...Interval switch.

Claims (1)

[Scope of utility model registration request] A rotary shaft of a rotary shutter mounted on the bottom of a grain tank in which grains to be dried are placed, or a rotary shaft that rotates in conjunction with the rotary shaft, is provided with an actuating piece that rotates in synchronization with the rotary shaft, and “ON” due to the approach and departure of the actuating piece to the rotation locus of the actuating piece.
A switch is provided that repeats the "off" operation, and the electric circuit that controls on/off the operation of the hot air generation device that generates the hot air to be sent to the grains loaded in the grain vat is set for a desired period of time. The interval switch is controlled by an interval switch that is turned on by a signal sent from the switch, and the interval switch is controlled to be turned on by an "on" or "off" signal transmitted from the switch, and the interval switch is turned on by a signal sent from the switch. A safety device for a circulating grain drying device, characterized in that the time set on the switch is set longer than the interval time of an "on" or "off" signal transmitted by the switch by rotation of the rotating shaft.