JPS6243267Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Technical field This invention relates to a circulating grain dryer that dries grain while circulating it between a storage tank and a drying chamber using a circulation device.

(b) Prior art In conventional circulating grain dryers, the grain stacked in the stacking hopper is conveyed to the drying room through a bucket conveyor, which is a circulation device. Grain is being loaded into the loading hopper while the rotary valve for carrying out grain at the bottom of the drying chamber is stopped by operation or lever operation. However, if you forget to stop the rotary valve and load the grain with the rotary valve activated, the rotation of the rotary valve will return the grain from the drying chamber to the bucket conveyor, which is connected to the bucket conveyor connected to the loading hopper. This caused the inconvenience of grain clogging around the bottom of the conveyor. Therefore, in conventional circulation type grain dryers, if a mistake is made in stopping the rotary valve, the grain loading operation cannot be carried out smoothly, so the rotary valve must be stopped when loading the grain, which improves operability. It had some disadvantages.

(c) Purpose of the invention In view of the above-mentioned points, the purpose of this invention is to provide a circulating grain dryer that can smoothly load grain and has excellent operability.

(d) Structure of the invention In summary, this invention includes a door that opens and closes the loading port, an opening/closing detection sensor that detects the opening/closing state of the door, and an opening/closing detection sensor that detects the opening/closing state of the door during grain circulation. and an unloading device drive stop control means for stopping the driving of the unloading device that sends out the grain loaded in the storage tank to the circulation device when the storage tank is detected. In conjunction with this, the drive of the unloading device is automatically stopped.

(e) Example Figure 1 is a schematic structural diagram of the main structure of the drying section of a circulating grain dryer that is an embodiment of this invention, and Figure 2 is the structure around the grain loading part of the circulating grain dryer. It is a diagram.

The grains 2 loaded in the storage tank 1 are stored in a drying room 7,
8, through the rotary valves 4, 5 provided below and the screw conveyor 6, and the bucket elevator 3 provided outside the storage tank 1. It is transported to the storage tank 1. The circulation passage 9 is connected to the storage tank 1 from the outlet of the drying chambers 7 and 8 via the bucket elevator 3.
It is located across the top of the. The bucket elevator 3 and the screw conveyor 6 constitute a circulation device that returns the grains carried out from the drying chambers 7 and 8 to the drying chambers 7 and 8 via the circulation passage 9. The rotary valves 4 and 5 described above constitute a carry-out device that carries out the grains from the drying chambers 7 and 8 to the screw conveyor 6. The screw conveyor 6 sends out the grains carried out by the rotary valves 4 and 5 to the circulation passage 9. The bucket elevator 3 scoops up the grain sent out by the screw conveyor 6 in a bucket and conveys it to the upper part of the storage tank 1.

A filling port 16 is formed in the outer lower part of the dryer body, facing the lower part of the bucket elevator 3. Inside the tensioning hopper 15, as shown in FIG. 3, a hopper shutter 18 is provided along the outer wall of the dryer main body. Hotupashiyatsuta 18
is a door that has a flat plate shape as a whole and opens and closes the insertion port 16 by sliding along the guide 21. The hopper shutter 18 can be lifted upward by manual operation and locked in any position by friction. By locking upward, the hopper shutter 18 is held in the open state shown by the two-dot chain line in FIG. This open state may be fixed using a locking metal fitting. An opening/closing detection sensor 20 is attached to the upper part of the tensioning hopper 15, which is close to the upper part of the flat surface of the hopper shutter 18 held in the open state. As the opening/closing detection sensor 20, a reed switch having a U-shaped switch portion is used. In the open state, the upper part of the flat part of the hopper shutter 18 is inserted into the gap of the U-shaped switch part, and the opening/closing detection sensor 20 is turned on. When the locked state is released and the shutter shutter 18 is returned to the closed state shown by the solid line, the upper part of the flat part passes through the U-shaped switch part and the opening/closing detection sensor 20 is turned off. Note that a micro switch or the like may be used as the opening/closing detection sensor 20.

Hot air a, b is supplied to the drying chambers 7, 8 from a hot air generator 10. The hot air generator 10 has a combustion burner and a blower inside, and supplies hot air to the drying chambers 7 and 8 by combustion of the combustion burner. Fuel is supplied to this combustion burner from a fuel tank 13 through a pipe 14. A solenoid valve 11 that opens and closes the fuel supply path and an electromagnetic pipe 12 that supplies fuel by pulse drive are provided in the middle of the pipe 14.

FIG. 4 is a control block diagram of this circulating grain dryer.

The control unit 23 is composed of a microcomputer, and controls hot air drying according to a hot air drying program stored in a built-in ROM (not shown). That is, a control signal is output from the control unit 23 to the drive circuit 24 of the electromagnetic pump 12 and the ignition device 25 to perform hot air drying based on the hot air drying program described above, and a A drive control signal is sent to the main motor drive device 26 and rotary valve drive device 27. The main motor drive device 26 drives the bucket elevator 3, the screw conveyor 6, and the blower. The opening/closing detection sensor 20 is a hot shutter 1.
When the upper part of the sensor 8 is pulled up to the position of the opening/closing detection sensor 20, it is turned on, and its output signal is given to the control section 23.

In the circulating grain dryer configured as described above, hot air drying is performed in one cycle of loading, circulation, drying, and discharge. The circulation, drying, and discharge modes are set by mode setting buttons provided on a control panel (not shown). The above-mentioned discharge mode is a mode in which the grains after drying are discharged from the main body of the dryer, and the grains are discharged by the screw conveyor 6 through a discharge passage provided separately from the circulation passage 9.
In addition, when discharging, the shutter of the above-mentioned discharge passage is opened. Further, while the grain dryer is in operation, a drive signal is given to the main motor drive device 26 to move the bucket elevator 3 up and down.

Next, the tensioning operation in this circulating grain dryer will be explained.

At the time of tensioning before the start of drying, no drive signal is given to the rotary valve drive device 27 and the drive of the rotary valves 4 and 5 is stopped. In this state, the hopper shutter 18 is pulled up, the loading port 16 is opened, and grain is loaded. When the hopper shutter 18 is pulled up and held in the open state, the loading port 1
6 is opened, and the grain stacked in the stacking hopper 15 is supplied to the bucket elevator 3. At this time, the open/closed detection sensor 2
Since the opening/closing detection sensor 20 is held at the zero attachment position, the opening/closing detection sensor 20 is turned on. As a result, an ON signal is given from the opening/closing detection sensor 20 to the control section 23, but no drive signal is sent to the rotary valve drive device 27. Hotupashitatuta 1 after finishing stakeout
8 is lowered to close the loading port 16, the opening/closing detection sensor 20 is turned off. When the circulation mode setting button is pressed with the loading port 16 closed, a drive signal is sent to the rotary valve drive device 27, and grain circulation is performed.

On the other hand, in the discharge mode, a drive signal is given to the rotary valve drive device 27, and the rotary valves 4 and 5 are driven.

Since the hopper shutter 18 is closed during the discharge mode, when drying grains with hot air continuously after discharge is completed, the hopper shutter 18 can be opened without pressing the operation stop button (not shown) and the grain can be loaded. I do. As in the case of tensioning before the start of drying, when the hopper shutter 18 is pulled up and held in the open state, the opening/closing detection sensor 20 detects the open state of the hopper shutter 18. At this time, the control section 23 receives the ON signal from the opening/closing detection sensor 20 and sends a drive stop signal to the rotary valve drive device 27. As a result, the opening/closing detection sensor 20
The rotary valves 4 and 5 are not driven while this is on. In this way, the rotary valves 4, 5
When loading while the bucket elevator 3 is in operation, opening the bucket shutter 18 automatically stops the driving of the rotary valves 4 and 5. This ensures that the grain loaded into the storage tank 1 is not returned to the bucket elevator 3 and is loaded securely. The dryer operation is greatly simplified.

(f) Effects of the invention As described above, according to this invention, when staking is performed while the unloading device is being driven, the driving of the unloading device is automatically stopped when the loading opening is opened. The grain carried into the storage tank can be reliably and smoothly loaded without being returned to the circulation device, and there is no need to stop the unloading device, which has the advantage of improving operability.

[Brief explanation of the drawing]

Figure 1 is a schematic structural diagram of the main structure of the drying section of a circulating grain dryer that is an embodiment of this invention, Figure 2 is a structural diagram of the vicinity of the grain loading part of the circulating grain dryer, and Figure 3 4 is a partially cutaway external perspective view of the vicinity of the grain loading port of the circulating grain dryer, and FIG. 4 is a control block diagram of the circulating grain dryer. 1...Storage tank, 3...Bucket elevator,
4, 5... rotary valve, 7, 8... drying chamber,
16... Slotting port, 18... Hotupashiyata, 20
...Open/close detection sensor.

Claims (1)

[Scope of utility model registration request] The grains loaded into the loading port are transported into a storage tank by a circulation device, and the grains in the storage tank are transported to the circulation device through a drying room by a transport device, and the grains are dried while being circulated. In the circulating grain dryer, a door that opens and closes the loading port, an open/close detection sensor that detects the open/close state of the door, and when the open/close detection sensor detects the open state of the door during grain circulation, A circulating grain dryer comprising: a carry-out device drive stop control means for stopping the drive of the carry-out device.