JPS6337896B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an automatic control device for a moisture measuring device that appropriately adjusts the flow time of grains supplied to the moisture measuring device to improve measurement accuracy. Conventional moisture measuring instruments that measure the supplied grain moisture by capacitance use a measurement chamber with a built-in anode that measures grain density based on the quality, shape, and grain surface roughness of the grain. For example, if the feeding speed of grains into the measuring chamber is faster than a certain predetermined time, the moisture value detected in the measuring chamber will be displayed lower than the true moisture value. However, on the other hand, if the supply rate is set longer than the predetermined time, there is a problem in that the moisture value is displayed higher than the true moisture value, resulting in a measurement error. Note that, in general, a drying method is mainly used to measure the true moisture value. Therefore, it is necessary to measure the grain density of the grains supplied into the measuring chamber using a weighing scale, and correct the grain density measurement value to the moisture value measured by capacitance to ensure accurate measurement accuracy. Therefore, for example, Japanese Patent Application Laid-Open No. 1983-
According to Publication No. 23458, even if the capacitance detected by the electrode plate of the moisture content meter fluctuates, the grain density is measured using a weighing scale, and the output of the moisture content meter is corrected based on the measurement output, ensuring measurement accuracy. Techniques that attempt to do this have been proposed. By the way, various devices have been proposed in the past to automate and save labor in the drying operation, in addition to efficiently drying the grain to high-quality grain without damage using a moisture measuring device. However, it has only recently been put into practical use due to improvements in the accuracy of moisture measuring instruments. The technology described in JP-A No. 55-23458 can almost completely automate the grain drying operation, but this method requires the flow rate of grain moisture supplied to the moisture content meter or weighing scale. It is not equipped with a flow rate adjustment mechanism to deal with changes in grain flow rate or changes in the flow rate between paddy and wheat. It was not possible to stabilize the resistance value or the value measured by the weight scale at a constant value, and there was a need for further improvement. Furthermore, Japanese Patent Application Laid-Open No. 53-102097 discloses a moisture measuring device in which a moisture measuring container equipped with a high-frequency moisture detector is mounted so that the grains move up and down at a predetermined weight. In addition, one end of a screw conveyor is attached to the wall of the dryer, and the other end is horizontally suspended above the moisture measuring device, and the deceleration motor provided on the screw conveyor is electrically connected to a timer, etc. When the timer reaches the set time, it activates the deceleration motor to rotate the screw conveyor, removes the grain from the dryer and feeds it to the moisture meter, and when the grain reaches a predetermined weight, its moisture is measured. However, even this device does not have a means to control the rotational speed of the screw conveyor in response to the level of grain moisture, etc., and the moisture measuring container The position of the grains falling from the screw conveyor changes, causing an error in the moisture detection value and weight detection value by the moisture detector, making the moisture measurement value unstable, and when using paddy and wheat together. There were drawbacks such as not being able to do anything. The present invention is an improvement to solve the above-mentioned problems, and includes a weighing device in which a moisture sensor is attached to the inner wall of a weighing container provided with a discharge valve at the bottom, and a weighing device is connected to the weighing container. In the moisture measuring device, the moisture sensor is connected to a control circuit to form a capacitive moisture measuring device, and a grain conveyor is disposed above the measuring container. A switch device is provided with a flow rate adjustment mechanism that controls the flow rate to increase or decrease the flow rate, and the flow rate adjustment mechanism is connected to the control circuit. With this structure, the flow rate adjustment mechanism is operated by a switch device in response to variations in the type of grain, changes in shape, etc. of the grains flowing down from the grain transporter to the weighing container. Automatic control of the moisture measuring device to control the grain flowing down to a specified time period, to ensure that the measured values of the moisture sensor and weighing device are accurate, and to ensure that the moisture measuring device can measure grain moisture with high efficiency and accuracy. The purpose is to provide equipment. The present invention will be explained with reference to embodiment figures. In Fig. 1, a grain feeding port 2 is provided on one side of the upper part, and a grain discharging port 3 is provided on the lower part of the machine frame 1. A grain conveyor 7 consisting of a grain conveying gutter 6 is placed thereon, and a vibration device 5 serving as a flow adjustment mechanism is mounted on the grain conveyor 7.
A weighing device 9 arranged at the lower part of the fixed plate 4 is mounted on the inner side wall surface of the machine frame 1, and a measuring container 10 is arranged at the lower part of the gutter end of the grain transport gutter 6 formed in the grain transporter 7. The measuring container 10 is integrally connected to the weighing device 9, and the grain flow path in the middle between the lower end of the grain conveying gutter 6 and the measuring container 10 is connected to the sorting air path 19.
A grain flow board 20 is arranged in the sorting air passage 19. The weighing device 9 has a fixed frame 11 with a hanging rod part protruding upward and a movable frame 12 with a horizontal rod part protruding laterally, which are arranged side by side, and the fixed frame 11 and the movable frame 12 are connected to the connecting rods 13,13.
The movable frame 12 is formed to be vertically movable, and the spring scale 1 is connected between the fixed frame 11 and the movable frame 12.
4 is provided to measure the weight of the measurement container 10. The measuring container 10 has a cylindrical body 1 with an open top.
A moisture sensor 16 for measuring the capacitance of grains is attached to the inner wall of the cylinder 5, and a discharge valve 17 provided at the bottom of the cylinder 15 is connected to an opening/closing actuator 18. The control box frame 21 has a built-in control circuit 21, and the front frame of the control box frame 21 is provided with a display 23 connected to the control circuit 21 to display the moisture value.
The weighing device 9, the moisture sensor 16, and the opening/closing device 18 are each electrically connected to a control circuit 22 to form a capacitive moisture measuring device. FIG. 4 is a block diagram of the control circuit 22, in which a pulse oscillator 35 is connected to a counting circuit 37 via a frequency divider 36.
The counting circuit 37 is connected to the decoder 38, and the terminals of each pit on the output side are branched into an arbitrary number of three sets, and each terminal of 0 to 3 is connected to the decoder 38.
It is connected to the relay R ₁ through a logic circuit 39 consisting of NAND ₁ and a buffer, the terminal of the vibration device 5 of the flow rate adjustment mechanism is connected to a one-shot circuit 40 to issue a hold signal to the display 23, and the spring 8 , each terminal of the weighing device 9 is NAND ₂
It is connected to relay R ₂ via a logic circuit 41 consisting of a buffer and a buffer. Next, the electric circuit of FIG.
The switch device 41 is connected electrically to the decoder 38 output side.
The terminal of is connected to the input side of NAND ₃ provided in the logic circuit 42, and its output side is connected to the input side of NAND ₄ , and the input side of NAND ₄ is connected to the input side of NAND 3 of the decoder 38.
, and the circuit of the switch device 41 that switches the grain feeding action to any required flow rate time, and also connect the output sides of NAND ₃ and ₄ to the input side of the OR gate, and connect the output side to the grain feeding operation. It is connected to the relay R ₁ which communicates with the vibration device 5 which constitutes the flow rate adjustment mechanism of the grain conveyor 7 . The effects of the above configuration will be explained below. The sample grains flowing from the grain tank to the grain conveying gutter 6 through the grain feeding port 2 are excited by the relay R ₁ by a signal from the grain feeding side circuit of the control circuit 22 and actuating the vibrating device 5. Due to the vibration action, the grains flow down from the gutter end of the grain conveying gutter 6, are air-selected in the sorting air passage, and only the sized grains slide onto the grain flow plate 19 and flow down into the measuring container 10 to be supplied. The feeding action is stopped by demagnetizing relay _R1 . Next, the grain moisture in the measurement container 10 is measured by the moisture sensor 16 based on the hold signal from the one-shot circuit 40, and the moisture value measured by the moisture sensor 16 and the moisture value detected by the weighing device 9 are measured. The change in grain weight is communicated to the control circuit 22, and the measured moisture value is corrected and displayed on the display 23. Next, relay _R2 is activated by the grain removal side circuit signal.
is excited, and the opening/closing actuator 18 is operated to open the discharge valve 17 to discharge the grain, and then close it to improve the moisture measurement function for the next time. It is continued repeatedly and repeatedly. In the grain feeding action of the grain conveyor 7 mentioned above, the coefficient of friction of the sample grains changes due to changes in shape depending on the variety of rice, wheat, etc. or differences in dryness, and therefore the grain feeding action is affected. It is necessary to change the required flow time in a timely manner. Tables 1 to 3 shown below will be explained. The required amount of sample grains to be supplied from the grain conveyor 7 to the measurement container 10 in a predetermined amount is determined by changes in the shape of the sample grains depending on their varieties such as paddy or wheat, or by changes in the coefficient of friction due to differences in dryness. In response to fluctuations in flow time, the true moisture value of the sample grain measured using the bone-dry method and the required flow time of the sample grain are determined using a switch device that controls the flow rate adjustment mechanism provided in the grain conveyor 7. The figure shows the moisture value measured by the moisture sensor 16 when the value is changed.

【table】

【table】

[Table] As can be seen from the above tables, in Table 1,
When the sample grain is paddy, the required flow time for the grain to flow down from the grain conveyor 7 to the measurement container 10 set in switching range 1 is the true moisture measured by the bone-dry method. Similarly, when the sample grain is barley, the switch device 41 is set to the switching range 2 shown in Table 2, and when the sample grain is wheat, the switch device 41 is set to the switching range 3 shown in Table 3. It can be seen that by switching, measurement accuracy close to the true moisture value obtained by the bone-dry method can be obtained. Therefore, in the grain feeding operation of the vibrating device 5 of the grain conveyor 7, while the L signal flows from the terminals 0 to 2 of the decoder 38 to the NAND ₃ provided in the logic circuit 42, the H signal is output to the output side. The contact of the switch device 41 opens and NAND ₄ inputs an L signal, and an H signal is generated on its output side, which is input to the OR circuit. Therefore, the OR circuit outputs an H signal. Then, the grain conveyor ₇ vibrates the vibration device 5 of the grain conveyor 7 to continue the grain feeding operation at a flow rate of a predetermined flow time. Further, when the grain feeding action is to be extended to an arbitrary grain flow time, by closing the contact of the switch device 41, the switch device 41 side emits an L signal, and this signal and the 4 of the decoder 38 The L signal from the terminal is input to each NAND ₄ , and the H signal is input from the output side to the OR circuit, so that the excitation time of the relay _R1 is extended and its grain feeding action is extended to an arbitrary flow time. Next, another embodiment of the flow rate adjustment mechanism provided in the grain conveyor 7 will be described with reference to FIG. A screw conveyor 24 is arranged horizontally on the upper part of the machine frame 1, and a supply port 25 is provided at one end of the cylindrical body of the conveyor 24 to be inserted into the grain tank, and a discharge port 26 is provided at the other end.
is installed in the measurement container 10 at the bottom. Reference numeral 27 designates an electric motor formed into a flow rate adjustment mechanism that rotates the screw conveyor 24, reference numeral 28 designates an air intake window provided on the side wall of the machine frame, and reference numeral 29 designates a grain board provided in the sorting air passage above the container 10, which rotates the screw conveyor 24. An electric motor 27 provided in the control circuit 22 is connected to the control circuit 22 . The other configurations and operations are the same as those of the previous embodiment, so the details will be omitted. What is shown in FIG. 3 is yet another embodiment of the grain conveyor 7, in which the grain conveyor 7 connects the fenestration 30 in the grain tank wall and the upper part of the machine frame 1 with an inclined flow down trough 31. ,
A flow rate adjustment mechanism consisting of a drive device 32 and a flow rate control valve 33 is provided at the upper end of the gutter body of the downflow gutter 31, and a regulation plate 34 is provided at the lower end of the gutter body. The grains flowing down the flow gutter 31 come into contact with the regulation plate 34 and flow downward to be air sorted, and the regulated grains slide on the flow grain plate 29 surface and are supplied to the measurement container 10 at the bottom, and the structure is simple. This has the effect of reducing production costs. As described above, the present invention allows the sample grains flowing down from the grain conveyor to the measuring container to accommodate changes in shape or dryness depending on the variety of rice, wheat, etc. The switch device was connected to the flow rate adjustment mechanism provided in the grain transporter via the control circuit so that the flow rate of grains flowing down from the grain transporter could be changed to any required flow time by changing the switch device. The grain feeding action is controlled by the flow rate adjustment mechanism, and the grains flowing down into the measuring container can be controlled at any predetermined flow time, making the moisture measurement accuracy of the moisture sensor that measures in the measuring container accurate. In conjunction with this, moisture measurement can be carried out with high efficiency.

[Brief explanation of the drawing]

The drawings are illustrations of embodiments of the present invention. Fig. 1 is a side sectional view of the present device, Fig. 2 is a side sectional view of the embodiment (part 2), Fig. 3 is a side sectional view of the embodiment (part 3), and Fig. 4 is its control circuit diagram. FIG. 5 is an electrical circuit diagram of the main part. 1... Machine frame, 2... Grain feeding port, 3... Grain discharging port, 4
... Fixed plate, 5 ... Vibration device, 6 ... Grain transport gutter, 7 ... Grain transporter, 8 ... Spring, 9 ... Weighing device, 10 ... Measuring container, 11 ... Fixed frame ,1
2...Moving frame, 13...Running rod, 14...Spring scale,
15... Cylindrical body, 16... Sensor, 17... Discharge valve, 18... Opening/closing actuator, 19... Grain plate, 2
0... Sorting air path, 21... Box frame, 22... Control circuit, 23... Display, 24... Screw conveyor, 25... Supply port, 26... Discharge port, 27...
Rotating device, 28...Air intake window, 29... Grain board, 3
0... Window opening, 31... Downflow gutter, 32... Drive device, 33... Flow control valve, 34... Regulation plate, 35
... Pulse oscillator, 36 ... Frequency divider, 37 ... Counting circuit, 38 ... Decoder, 39 ... Logic circuit,
40... One shot circuit, 41... Switch device, 42... Logic circuit.

Claims (1)

[Claims] 1. A moisture sensor is attached to the inner wall of a measuring container provided with a discharge valve at the bottom, and a weighing device connected to the measuring container and the moisture sensor are connected to a control circuit to generate static electricity. In the moisture measuring device formed as a capacitive moisture measuring device and having a grain conveyor disposed above the measuring container, the grain conveyor is provided with a flow rate adjustment mechanism for controlling the grain flow rate to increase or decrease, and the A moisture measuring device characterized in that a switch device capable of changing the flow rate of grains flowing down from the grain conveyor to the measuring container at an arbitrary required flow time and the flow rate adjustment mechanism are connected via the control circuit. Automatic control device. 2. The automatic control device for a moisture measuring instrument according to claim 1, wherein the grain conveyor is formed as a grain conveying gutter equipped with a vibration device. 3. The automatic control device for a moisture measuring device according to claim 1, wherein the grain conveyor is formed as a conveyor device equipped with a rotating device. 4. The automatic control device for a moisture measuring instrument according to any one of claims 1 to 3, wherein the switch device is provided with a switch for switching the grain to be supplied to the measuring container between paddy and wheat.