JPS6243265Y2 - - 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. The disadvantage was that it required a stop operation and was inferior in operability.

(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 grain detection sensor installed at a loading port, a door for opening and closing the loading port, a door opening/closing device for opening and closing the door, and a grain detection sensor installed at a loading port, a door opening/closing device for opening and closing the door, and a grain detection sensor installed at a loading port, a door opening/closing device for opening and closing the door, and When the detection sensor detects that the grain has been loaded into the loading port, the door opening/closing device is driven to open the door, and the grain that has passed through the drying room is transported to the circulation device. It is characterized by having a door opening/closing device for stopping the drive of the device and a means for stopping the drive of the carrying out device, and the door is automatically opened when grain is loaded during grain circulation, and the driving of the carrying out device is stopped. It was designed to do so.

(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 path 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. The loading port 16 is an automatic opening/closing type hotspa shutter 17.
It is opened and closed by. Hotupashiyatsuta 17 is the third
As shown in the figure, a flat part that slides along a guide 21 provided inside the tensioning hopper 15;
It has a rack part 18 vertically disposed above the flat part. The rack portion 18 engages with a pinion gear 34 attached to a rotating shaft of a shutter drive portion 20 provided outside the dryer body. Shutter drive section 20
includes a drive motor, and by driving the drive motor, the pinion gear 34 rotates. As the pinion gear 34 rotates, the rack portion 18 engaged with the pinion gear 34 moves up and down, and as the rack portion 18 moves up and down, the hopper shutter 17 opens and closes along the guide 21. Further, an upper limit switch 32 and a lower limit switch 33 are attached to the dryer body along the vertical direction of the rack section 18. Upper limit switch 32
The mounting interval between the lower limit switch 33 and the lower limit switch 33 corresponds to the vertical movement distance of the hopper shutter 17.
On the side surface of the rack portion 18, projections are formed at the upper and lower portions of the rack portion 18 to contact the respective contact points of the upper limit switch 32 and the lower limit switch 33.

The stake-in hopper 15 has an inclined surface that extends from the upper opening to the stake-in port 16, and a capacitive proximity switch 31 is attached to the inclined bottom surface near the stake-in port 16 at the bottom of the stake-in hopper 15. It is being The proximity switch 31 is attached so that its detection surface follows the inclined bottom surface of the hopper 15, and a protection plate such as an acrylic plate is attached to the detection surface to prevent direct contact with the grain. Note that an optical sensor, a pressure switch, or the like may be used as a detection means for detecting the presence or absence of staked grain in the staked hopper 15. Further, a proximity switch 31 is provided inside the stake-out hopper 15.
A wire mesh 19 is installed at a higher position to prevent grain storage bags or the like from being mixed in during circulation and drying and erroneously detecting a tasseled state.

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 22 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 22 to the drive circuit 23 of the electromagnetic pipe 12, the ignition device 24, and the main motor drive device 25 to perform hot air drying based on the hot air drying program, and
In response to the output signal from the proximity switch 31, a drive control signal is sent to the rotary valve drive device 26. The main motor drive device 25 drives the bucket elevator 3, the screw conveyor 6, and the blower. Further, on/off signals of the upper limit switch 32 and the lower limit switch 33 are given to the control section 22, and drive control of the shutter drive section 20 is performed. Upper limit switch 3
2 is turned on when the projection on the upper part of the rack part 18 comes into contact with its contact point, and the lower limit switch 33 is turned on when the projection on the lower part of the rack part 18 comes into contact with its contact point. .

Proximity switch 31 is turned on when grain is detected, and its output signal is sent to control section 22 and timer 27. The timer 27 starts counting upon receiving the off signal from the proximity switch 31, and measures the off time of the proximity switch 31 until it is next turned on. Comparison circuit 28 inputs off time data from timer 27, compares the data with delay time data preset by delay time setting circuit 29, and provides on/off signals to relay circuit 30. The relay circuit 30 is provided between the rotary valve drive device 26 and a drive power source (not shown), and controls the supply of drive power to the drive motor included in the rotary valve drive device 26 .

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 25 to move the bucket elevator 3 up and down.

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

During tensioning before the start of drying, no drive signal is given to the rotary valve drive device 26 and the drive of the rotary valves 4 and 5 is stopped. Furthermore, before the start of drying, the hot spring shutter 17 closes the filling port 16, so the upper limit switch 32 is turned off and the lower limit switch 33 is turned on. When grain is loaded into the loading hopper 15 in this state, the proximity switch 31 detects the grain and outputs an on signal to the control section 22. When the proximity switch 31 is turned on, a drive signal is sent to the shutter drive section 20, and the upper limit switch 32 is activated.
The shutter drive section 20 is driven until the shutter is turned on. That is, as the shutter driving section 20 is driven, the rack section 18 moves upward as shown by the two-dot chain line in FIG. 17 stops. At this stop position, the hopper shutter 17 is held in an open state by the engagement between the rack portion 18 and the pinion gear 34. Further, in response to the ON signal from the proximity switch 31, the control section 22 controls the main motor drive device 25.
A drive signal is sent to the bucket elevator 3 to start raising and lowering the bucket elevator 3. The grain piled into the loading hopper 15 in this way is supplied to the bucket elevator 3 through the loading port 16.
It is conveyed to the storage tank 1 by lifting and lowering. When all the grains have been staked, the proximity switch 31 is turned off, a drive signal is sent to the shutter drive unit 20, and the drive motor of the shutter drive unit 20 rotates in the opposite direction to that when opening the hopper shutter 17. The hopper shutter 17 is lowered. The protrusion at the bottom of the rack part 18 is the lower limit switch 33.
When it comes into contact with the contact point, the lower limit switch 3
3 is turned off and the drive of the shutter drive section 20 is stopped. At this stop position, the hopper shutter 17 closes the loading port 16.

On the other hand, in the discharge mode, a drive signal is given to the rotary valve drive device 26, and the rotary valves 4 and 5 are driven. Therefore, if the grain is loaded into the loading hopper 15 without pressing the operation stop button (not shown) in order to continuously dry the grain with hot air after completion of discharge, the grain is detected by the proximity switch 31. The control unit 22 receives the ON signal from the proximity switch 31 and sends an OFF signal to turn off the rotary valve driving device 26, thereby stopping the driving of the rotary valves 4 and 5. Moreover, timer 2
7 is given an on signal from the proximity switch 31, so the timer 27 does not operate. That is,
While the proximity switch 31 is on, the rotary valves 4 and 5 are not driven. Further, when the proximity switch 31 is turned on, a drive signal is applied to the shutter drive unit 20, and the hopper shutter 17 moves upward to open the loading port 16, as in the case of loading before the start of drying. After the shutter shutter 17 rises to the position where the upper limit switch 32 is turned on, the drive of the shutter drive section 20 is stopped and the opening state of the loading port 16 is maintained.

By the way, when staking is carried out one bag at a time by a worker, the staking hopper 1 is temporarily removed during staking.
There will be no grain in 5. In this case, during the tensioning process, the proximity switch 31 is turned off, so the control section 22 sends an on signal to turn on the rotary valve drive device 26. At the same time, the timer 27 starts counting due to the off signal from the proximity switch 31. When the interrupted stakeout is resumed, the proximity switch 31 is turned on again and the timer 27 finishes counting. At that time, the comparison circuit 28 compares the off time of the proximity switch 31 measured by the timer 27 with a preset delay time, and sends a signal to the relay circuit 30 to turn off the relay circuit 30 when the off time is shorter than the delay time. Output. Therefore, even if there is an interruption during tensioning, if the interruption time is shorter than the set delay time, the relay circuit 3
0 is turned off and the rotary valves 4 and 5 are not driven. As described above, by presetting the interruption time that occurs during tensioning as a delay time, it is possible to prevent the rotary valves 4 and 5 from being erroneously driven during tensioning. When the stakeout work is completed, the proximity switch 31 is turned off, and the off time at that time is longer than the delay time, so the relay circuit 3
0 is turned on and the rotary valves 4 and 5 are restarted.

As mentioned above, when filling is performed while the rotary valves 4 and 5 are being driven, the driving of the rotary valves 4 and 5 is automatically stopped without performing a stop operation. Grain is not returned to the bucket conveyor 3 and the tensioning work can be carried out smoothly. Furthermore, when loading grain, simply loading the grain into the loading hopper 15 automatically opens the loading port 16.
Furthermore, there is no need to perform an operation to stop driving the rotary valves 4 and 5, and the operation of the dryer is greatly simplified.

FIG. 5 is a block diagram of another hotspa shutter opening/closing device used in this invention.

The upper part of the hopper shutter 40 is connected to one end of a lever 41, and the other end of the lever 41 is connected to a movable part 44 of a solenoid 43. Furthermore, a return spring 42 is attached to the solenoid 43 side of the lever 41. In such a hopper shutter opening/closing device, when the solenoid 43 is attracted (turned on), the lever 41 rotates clockwise about the fulcrum 45 and moves from the position indicated by the two-dot chain line to the position indicated by the solid line in FIG. raise. Also,
When the solenoid 43 is turned off, the lever 41 is rotated counterclockwise by the action of the return spring 42, and the hopper shutter 40 is lowered. By using the above-mentioned hopper shutter opening/closing device, when the grain detection sensor provided in the hopper detects grain, the solenoid 43 is turned on, thereby opening the loading port.

(f) Effect of the invention As described above, according to this invention, if the loading is performed while the unloading device is being driven, the loading opening is automatically opened and the driving of the unloading device is stopped. Therefore, the grain carried into the storage tank can be loaded smoothly without being returned to the circulation device, and there is no need to open/close the loading port or 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 control block diagram of the circulating grain dryer, and FIG. 5 is a configuration diagram of another hopper shutter opening/closing device used in this invention. 1...Storage tank, 3...Bucket elevator,
4, 5... rotary valve, 7, 8... drying chamber,
16... Slotting port, 17... Hotupashiyata, 18
...(Hotupashiyatsuta 17) Rack part, 20...
...Shutter drive unit, 31...Proximity switch.

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 grain detection sensor provided at the loading port;
a door that opens and closes the loading port; a door opening/closing device that opens and closes the door; and a door that opens and closes the door when the grain detection sensor detects that grain is loaded into the loading port during grain circulation A circulating grain dryer comprising a door opening/closing device that drives an opening/closing device to open the door and stops driving of the carrying out device, and a carrying out device drive stop control means.