JPS6138793B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a storage tank discharge control device suitable for use in a rice center drying plant, etc.

At the rice center, paddy is harvested and threshed with a combine harvester, collected from various locations, dried in an integrated process, and then hulled to become rice and shipped. That is, the collected paddy with high moisture content is supplied from a receiving hopper to a rough sorter, where it is roughly sorted to remove impurities, and then loaded into a storage tank by a loading elevator. The paddy is pre-dried in this storage tank over a certain period of time under conditions close to natural drying, and the paddy with a high moisture content is
%. The rice pre-dried in this way is conveyed to a down-flow type dryer by a conveyor and an elevator, and then dried with hot air to reduce the moisture content to, for example, about 15%.
After the dried paddy is tempered in a finishing tank, it is supplied to a huller, where it is hulled, sorted, and grained before being shipped as a product.

Among these, the storage tank is made up of multiple bins, and the floor surface is made of a perforated plate called a sweep floor. It is now being sent to Such a storage tank is disclosed in, for example, Japanese Patent Application Laid-Open No. 52-122558.
It is shown in the publication No. However, in conventional storage tanks, when grains are discharged from the bin, when there is a large amount of grains, the wind pressure is insufficient because the grains act as a load against the wind entering the bin from the sweep floor. However, when the remaining amount decreases and the sweep floor becomes exposed, the amount of air escapes from the exposed surface, the air blowing pressure decreases, and the amount of grain discharged decreases rapidly. For this reason, there was a drawback that it took a long time to complete the discharge, which significantly reduced work efficiency.

The present invention was made in order to eliminate these conventional drawbacks, and its purpose is to ensure that the discharge work is carried out smoothly and quickly regardless of the amount of grain remaining, thereby increasing productivity. An object of the present invention is to provide an improved storage tank discharge control device.

In order to achieve such an object, the present invention measures the internal pressure of the wind barrel that commonly communicates with the inflow ports of each bottle, and when this falls below a predetermined value, transmits a pressure reduction signal, and uses this pressure reduction signal to This system is designed to reduce or stop air blowing to bins from which grains are not being discharged.

Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 1 is a front view of the arrangement of a storage tank equipped with an embodiment of the discharge control device according to the present invention, and FIG. 2 is a side view. In the figure, 1 is a storage tank, and a plurality of bottles 1a, 1b, 1c, 1d, 1e, 1 are lined up in two rows.
It consists of f, 1g, and 1h. Note that the bins 1b, 1d, and 1f are not shown in FIGS. 1 and 2. A wind trunk 2 is formed at the lower center of the storage tank 1 over its entire length, and air is sent to this wind trunk 2 from a blower 3, and this air is further supplied to each bottle. There is. An anemometer 4 as a detection means consisting of an electronic differential pressure transmitter or the like is provided on the outer wall of the wind barrel section 2 so that a sensing section is disposed inside. This anemometer 4 detects the static air pressure within the wind barrel 2, that is, the air blowing pressure supplied to each bottle. Reference numerals 5a and 5b are conveyors for placing paddy into each bin from above, 6 is a rotation conveyor for conveying the paddy discharged from the bottom of each bin, and 7 is a transfer conveyor for conveying the paddy discharged from the bottom of each bin. This is a rotation elevator for raising the rice that has arrived and returning it to the loading conveyors 5a, 5b. The paddy in the bin is rotated several times to pre-dry it. The paddy that has been sufficiently predried is branched from the middle of the rotation and sent to the next stage relay tank and dryer (not shown). In addition, 8 inputs the depressurization signal sent from the wind pressure gauge 4 and the empty signal sent when the bin is empty by detecting the presence or absence of paddy using sensors installed near the exit of each bin. A control circuit section 9 performs control processing, a blower 3, and a tension conveyor 5.
a, 5b, a control panel for operating the driving operations of the rotation conveyor 6, the rotation elevator 7, and the measurement operation of the anemometer 4.

FIG. 3 is a front view of the bottle 1d seen from inside the wind barrel, FIG. 4 is a cross-sectional view of FIG. 3, and FIG. 5 is a cross-sectional view of FIG. 3. In FIG. 3, a discharge shutter 11 for controlling the discharge of paddy is provided at the center of the lower part of the wall facing the cavity 2 of the bin 1d, and is movable up and down. An air volume shutter 12 that controls the air volume when the air flows into the underfloor of the bin 1d is provided to be movable up and down. The discharge shutter 11 and the air volume shutter 12 can be moved up and down by an electric cylinder (not shown) via operating rods 13 and 14. 15 is a chute for guiding the paddy discharged from the bin 1d to the rotation conveyor 6.

In FIG. 4, an inlet 18 is formed in a lower floor 17 provided below a sweep floor 16 forming the floor of the bin 1d. The figure shows a state in which the air volume shutter 12 closes the inlet 18. When the operating rod 14 moves upward and the air volume shutter 12 opens, the air flows from the wind trunk 2 through the inlet 18 into the lower floor 17, and from there it is further blown into the bin through the sweep floor 16. Ru. The amount of air blown is adjusted by the degree to which the air volume shutter 12 is opened.
This sweep floor 16 has a large number of holes formed in an oblique direction, and the paddy is sequentially sent to the wind trunk side where the outlet is located by the oblique wind blowing in from below. The wind that passes through the grains escapes from above, which gradually removes moisture from the grains.

In FIG. 5, a discharge port 20 is formed at an outlet portion 19 provided by cutting out a portion of the sweep floor 16. In the figure, discharge shutter 1
1 indicates a state in which the discharge port 20 is closed. When the operating rod 13 moves upward and the discharge shutter 11 is opened, the loaded rice is supplied from the outlet section 19 to the discharge port 20 and then through the chute 15 to the rotation conveyor 6.

FIG. 6 is a plan view of the exit portion 19 of the sweep floor 16. Most of the holes in the sweep floor 16 are formed in the direction toward the wind trunk (to the left in the figure), but at the end on the outlet part 19 side, the holes are formed in the direction perpendicular to this toward the outlet part 19 (in the upper direction in the figure). (downward). Therefore, the wind blown from below the sweep floor 16 heads in the direction of the arrow, and the paddy is sequentially sent to the outlet section 19.

The above description has been about the bin 1d, but all the other bins are configured in the same way.

When the bins are sufficiently filled with paddy, the paddy acts as a resistance to the wind, and the static pressure in the wind barrel, which is commonly connected to the inlet of each bin, is maintained at a predetermined level. However, when a certain bin discharges paddy and the number of paddy on the sweep floor decreases and the holes become exposed, the air blowing pressure into this bin, that is, the static pressure inside the wind barrel, decreases rapidly. come. When the air blowing pressure becomes low in this way, it becomes difficult to send the paddy to the outlet section. When such a state occurs, the measured value of the anemometer becomes less than a predetermined set value and a pressure reduction signal is transmitted.

This signal operates the shutter control circuit,
Close the air volume shutters of all bins other than the bin from which paddy is being discharged, and reduce or stop the air blowing to these bins. As a result, the static pressure within the wind barrel increases, and therefore the air blowing pressure against the bin from which paddy is being discharged also increases, and the remaining paddy is discharged from the outlet in a short period of time.

FIG. 7 is a circuit diagram of the shutter control circuit. In the figure, LS ₁₁ , LS ₂₁ , LS ₃₁ , ... are limit switches that are turned on when the air volume shutters in the first, second, third, ... bins are opened, and LS ₁₂ ,
LS ₂₂ , LS ₃₂ , ... are limit switches that turn on when the same air volume shutter is closed, LS ₁ , LS ₂ , LS ₃ ,
...is also a limit switch that turns on when the ejection shutter opens. A ₁ , A ₂ , A ₃ , ... are wind pressure switches that are turned on at the same time when the pressure reduction signal is sent from the wind pressure gauge, and B ₁ , B ₂ , B ₃ , ... are the wind pressure switches that are turned on when the rotation is set to blow air into the bottle. The setting switches to turn on, PB ₁₁ , PB ₂₁ , PB ₃₁ , ... are push-button manual switches used to manually close the air volume shutters, PB ₁₂ , PB ₂₂ , PB ₃₂ ,
...is also a push-button manual switch used to open the air volume shutter.

When the program to discharge paddy from the first bin is set, the setting switch is set by this program.
B ₁ is automatically turned on. When setting switch _B1 is turned on, relay _M12 is activated and relay contact _m12 is turned off. Along with this operation, the electric cylinder operates and the air volume shutter of the first bin opens. When the electric cylinder moves to the air volume shutter fully open position, limit switch LS ₁₁ is turned on, relay X ₁₁ is activated, and relay contact x ₁₁ is turned on. Turn off. By turning off relay contact _x11 , relay _M12 is restored and relay contact _m12 is turned on again. Further, according to the program, the discharge shutter of the first bin is automatically opened, and when the discharge shutter is fully open, the limit switch _LS1 is turned on, the relay _Z1 is activated, and the relay contact _Z1 is turned off.

Next, manually switch the second bin, third bin, etc.
Press PB ₂₂ , PB ₃₂ ,... to turn on the relay.
M ₂₂ , M ₃₂ ,... operate and relay contacts m ₂₂ , m ₃₂ ,...
is turned off. Along with this operation, the electric cylinders are operated, and the air volume shutters of the second bin, the third bin, and so on are opened. When the air volume shutter is fully open, limit switches LS ₂₁ , LS ₃₁ ,... are turned on, relays X ₂₁ , X ₃₁ ,... are operated, and relay contacts x ₂₁ , x ₃₁ ,...
...is turned off. When relay contacts x ₂₁ , x ₃₁ , ... are turned off, relays M ₂₂ , M ₃₂ , ... are restored and become relay contacts.
m ₂₂ , m ₃₂ , ... are turned on again.

As a result, paddy is discharged only from the first bin, and air is blown to all the operating bins.

Here, as the first bin progresses and the amount of paddy decreases, the holes in the sweep floor are exposed and the static pressure in the wind barrel decreases below the set value, the wind pressure gauge sends a depressurization signal and the wind pressure switches A ₁ and A are activated. ₂ , A ₃ , ... are all turned on. In the first bin, the wind pressure switch A ₁
Even if is on, relay _M11 does not operate because relay contact _z1 is off, but in other bins,
When the wind pressure switches A ₂ , A ₃ ,... are turned on, the relay is activated.
M ₂₁ , M ₃₁ , ... operate, and relay contacts m ₂₁ , m ₃₁ ,
...is turned off. Along with this operation, the electric cylinder operates in the opposite direction to the above, and the air volume shutter of each bin is closed. When the electric cylinder moves to the air volume shutter fully closed position, the limit switches LS ₂₂ , LS ₃₂ ,...
turns on, relays X ₂₂ , X ₃₂ , ... operate, and relay contacts x ₂₂ , x ₃₂ , ... turn off. This relay contact x ₂₂ ,
By turning off x ₃₂ , ..., relays M ₂₁ , M ₃₁ , ... are restored, and relay contacts m ₂₁ , m ₃₁ ... are turned on again. Therefore, each of these parts constitutes a means for stopping the air blowing to the bins other than the first bin which is being discharged based on the pressure reduction signal. In addition,
If the air volume shutter is not fully closed but partially open, the air blowing to the bins other than the first bin will not stop but will be reduced.

In this way, since the air volume shutter is opened only for the first bin, the air is concentrated in the first bin and the paddy is discharged in a short time.

When the first bin is completely discharged, an empty signal is generated and the first bin's discharge shutter is closed. This turns limit switch LS ₁ off and relays
Z ₁ is restored and relay contact z ₁ is turned back on. When the relay contact _z1 is turned on, the relay _M11 is activated, and at the same time, the relay contact _m11 is turned on, and at the same time, the air volume shutter of the first bin is closed. Then, similarly to the above, limit switch LS ₁₂ is turned on, relay X ₁₂ is activated, relay M ₁₁ is restored, and relay contact m ₁₁ is turned off again.
When all the air volume shutters close, the static pressure inside the wind barrel suddenly increases, the pressure reduction signal disappears, and the air pressure switches A ₁ , A ₂ , A ₃ , . . . all turn off. Then, the air volume shutters of the bins other than the first bin are opened again. Then move on to the next program.

In addition, Y ₁₁ , Y ₁₂ , Y ₂₁ , Y ₂₂ , Y ₃₁ , Y ₃₂ , ... are manual switches PB ₁₁ , PB ₁₂ , PB ₂₁ , PB ₂₂ , PB ₃₁ ,
The circuit self-holding relays are activated by turning on PB ₃₂ , . . . y ₁₁ , y ₁₂ , y ₂₁ , y ₂₂ , y ₃₁ , y ₃₂ , . . are relay contacts that are activated by the activation.

In the above example, the air volume shutter of the first bin was opened automatically according to the program setting, and the other bins were opened manually, but it is also possible to configure the air volume shutter of the first bin to be opened manually, and all the shutters can be opened manually according to the program settings. You can also set it to open automatically. Further, the ejection shutter can also be opened manually.

FIG. 8 is a flowchart for explaining the operation of the emission control device. Turn on the power switch to start the device, first operate the keys on the control panel,
Perform program settings for rotation conditions such as setting the order of bottles to be discharged and setting to exclude unused bottles. When the setting is appropriate, rotational conveyance and preliminary drying by blowing air are started. The program opens the discharge shutter of a certain bin to start discharging the paddy, and when the wind pressure falls below the set value, the air volume shutters of other bins are closed. When the bin being discharged is empty, the discharge shutter of this bin is closed and the air volume shutter is also closed at the same time, and the air volume shutters of the other bins are opened. Then, the process moves to the next set set by the program and repeats the same operation. If there is no next set, stop the operation of each transport line and shutter.

FIG. 9 is a partially cutaway front view of a rotation conveyor according to another embodiment. In the figure, 21
22 is a belt, 22 is paddy discharged from a bin and conveyed on the belt 21 in the direction of the arrow, 23 is a spindle rotatably provided across the case 24 of the rotation conveyor 6, and 25 is a spindle 23 a sensing plate fixed to and disposed across the entire width within the case 24;
26 is a rotating arm which is also fixed to the support shaft 23 and placed outside the case 24, and 27 is a rotating arm 26.
drive pins 29 and 30 are switches provided at predetermined positions on the outer surface of the case 24;
31 and 32 are actuators of switches 29 and 30 arranged within the rotation range of the drive pin 27. The switches 29 and 30 operate when the drive pin 27 pushes the actuators 31 and 32 from top to bottom, respectively, but do not operate when the drive pin 27 pushes the actuators 31 and 32 from bottom to top.

When the paddy 22 reaches the height level shown in A, for example, the drive pin 27 is above the actuator 31, but when the height decreases to the level shown in B, the sensing plate 25 rotates downward and the rotating arm Since the actuator 26 also rotates together, the actuator 31 is pushed by the drive pin 27 and the switch 29 is operated. When the paddy 22 further decreases to the level shown in C, the actuator 32 is activated by the drive pin 27.
is pressed, and the switch 30 operates.

By operating the switch 29, a first reduction signal is transmitted to bring the air volume shutters of the other bins into the intermediate closed state;
Further, by operating the switch 30, a second reduction signal is transmitted to completely close the air volume shutter.

A control circuit similar to that shown in FIG. 7 is used for this control. However, a limit switch that is turned on when the electric cylinder moves to the middle closed position and a relay circuit that is operated thereby are required. If only one of the switches 29 and 30 is used to fully close the switch by this operation, it can be used for the A switch in FIG. 7 and controlled by the same circuit.

As described above, according to the storage tank discharge control device according to the present invention, the operation of discharging grains from the bin is always done quickly and smoothly regardless of the remaining amount of grains, and productivity is improved.

[Brief explanation of the drawing]

FIG. 1 is a front view of the arrangement of a storage tank equipped with an embodiment of the discharge control device according to the present invention, and FIG. 2 is a side view.
Figure 3 is a front view of the bottle seen from inside the wind barrel, Figure 4 is a sectional view of Figure 3, and Figure 5 is a cross-sectional view of Figure 3.
6 is a plan view of the outlet section of the sweep floor, FIG. 7 is a circuit diagram of the shutter control circuit, FIG. 8 is a flowchart, and FIG. 9 is a diagram of a rotary conveyor of another embodiment. FIG. 1...Storage tank, 1a to 1h...Bin, 2...Wind barrel, 3...Blower, 4...Anemometer, 5a, 5c
... Staking conveyor, 6 ... Rotation conveyor, 7 ... Rotation elevator, 11 ...
Discharge shutter, 12...Air volume shutter, 13,1
4...Operation rod, 16...Sweep floor, 1
7... Lower part of the floor, 18... Inlet, 19... Outlet, 20... Outlet.

Claims (1)

[Claims] 1 A storage tank is made up of multiple bins with a swept floor, and at the bottom of each bin there is an inlet that takes in air from under the floor to blow into the bin, and an inlet that discharges the grains packed inside the bin. At the same time, an air volume shutter for opening and closing the inlet and a discharge shutter for opening and closing the outlet are provided, and air is sent by a blower to the wind barrel that commonly communicates with the inlet of each bin, and this air is In a storage tank discharge control device that introduces grains into the bin from under the floor through an inlet and sends the grains stuck inside the bin in the direction of the discharge port while drying, the internal pressure of the wind barrel is a detection means for measuring the pressure and transmitting a pressure reduction signal when the pressure falls below a predetermined value; and a detection means for driving the air volume shutter of the bin from which grains are not being discharged based on the pressure reduction signal, and control means for reducing or stopping air blowing.