JPH0440630B2 - - Google Patents

Description

[Detailed description of the invention] An automatic moisture meter measures the moisture content of grains during drying at regular time intervals, and based on the measurement data, the calculated moisture content value each time is displayed on a digital display. There is a grain dryer that automatically stops drying operation if the value falls below a target finished moisture content a predetermined number of times in succession.

In this way, the automatic moisture meter does not immediately stop drying when the calculated moisture content falls below the target finished moisture content even once, but continues drying until it falls below the target finished moisture content a predetermined number of times in a row. This is to prevent the drying operation from being stopped by mistake in the event that the measurement is made of contaminants such as dry shinobi or straw pieces.
Conventionally, even values lower than the final moisture content are displayed on the display, so when a value lower than the final moisture content is displayed, an operator may mistake it for a malfunction in the automatic stop mechanism, and it will continue to display for a predetermined number of times. There were cases where drying was stopped manually without waiting for the drying to stop automatically.

The purpose of the present invention is to prevent such erroneous operations caused by operator misunderstandings, and even if the calculated value of moisture content is lower than the target finished moisture content, the number of times that the calculated value is lower than the target finished moisture content will continue to exceed the specified number of times. Until the number of times the dryer is reached, that is, before the dryer is automatically stopped, a certain value is added to the calculated value and a value higher than the target finished moisture content is displayed.

Next, the present invention will be explained based on embodiments shown in the drawings.

Reference numeral 1 denotes a grain storage chamber, to the bottom of which a drying chamber 2 made of a perforated plate is connected, and a rotary valve 3 is installed at the lower end outlet of the drying chamber 2. 4 is a grain collection room at the bottom of the machine, and a grain collection helix 5 is horizontally suspended in the center of the room. The delivery end of the grain collecting helix 5 is connected to the lower intake port of the grain hoist 6, and the upper exit thereof is connected to one end of the grain feeding helix 7 horizontally suspended on the ceiling of the storage chamber 1.

The other end of the grain feeding helix 7 opens above a diffusion plate 8 that hangs down from the center of the ceiling of the storage chamber 1. 9 is grain raising machine 6
This is a grain hopper that communicates with the lower intake of the grain.

Then, the burner 10 installed on the front of the machine looks into the hot air chamber 11 between the left and right drying chambers 2, 2, and the suction exhaust installed on the back of the dryer is placed in the exhaust chamber 12 outside of the drying chambers 2, 2. Peek at Juan 13.

The hot air from the burner 10 blown into the hot air chamber 11 is passed through the left and right drying chambers 2, 2, and the exhaust air is discharged from the exhaust chamber 12 through the suction and exhaust fan 13 to the outside of the machine.

As a result, the grains in the drying chamber 2 that have flowed down from the storage chamber 1 are dried, and the dried grains pass through the rotary valve 3 and fall into the grain collecting room 4, and are then sent to the grain collecting helix 5, the grain elevator 6, and the feeder. It returns to the storage chamber 1 via the grain helix 7 and the diffusion plate 8.

In this way, the grains are dried while circulating inside the machine.In the present invention, an automatic moisture meter 14 is attached to the machine wall of the storage chamber 1, and the moisture content of the grains inside the machine is measured at regular intervals. do.

Reference numeral 15 denotes an average moisture content calculation means, to which the automatic moisture meter 14 is connected to the input side, and calculates the moving average sn of the n-th measured output value Msn of the automatic moisture meter 14 according to the following equation.

sn=asn-1+(1-a)Msn [where a is a constant less than 1, and when n=1, s1
=Ms1] Then, a judgment circuit 17 compares the average moisture content calculating means 15 with the finishing moisture content measuring means 16 which sets a target finishing moisture content and outputs a finishing moisture content signal Me corresponding to the set moisture content. Connect to.

The comparison/judgment circuit 17 compares the average moisture content sn and the finished moisture content Me, and generates an output signal according to the comparison result.

A display determining means 18 is connected to the output side of the comparison/judgment circuit 17. This display determining means 18 is
Using the output signal of the comparison judgment circuit 17 as an input signal, if the average moisture content sn exceeds the finished moisture content, a display signal that should display a value equal to the average moisture content is output, and the average moisture content sn is the finished moisture content. If it is less than Me and the number of consecutive times does not reach the predetermined number N, a display signal that should display a value larger than the finished moisture content is output.

A digital display 19 is connected to the output side of the display determining means 18, and digitally displays the water content according to the display signal of the display value determining means 18.

First, the number N of times the dryer is automatically stopped when the average moisture content is lower than the finished moisture content is determined. For example, set N=3. When the dryer is started, the automatic moisture meter goes through a routine that measures the outside temperature and checks whether the sensor is abnormal according to the flowchart in Figure 4.
= 30, it is driven periodically to measure the moisture content of the grains during drying.

Then, the average moisture content sn is calculated from the measurement data of the automatic moisture meter 14 according to the above-mentioned calculation formula, and compared with the finished moisture content Me in the comparative judgment circuit 17.

As a result, if the average moisture content sn is greater than the finished moisture content Me, drying is continued as is.

Next, if the average moisture content sn is equal to or smaller than the finished moisture content Me, count the number of times,
If the number of times does not reach the set N times as described above, a certain value is added to the average moisture content, which results in a value slightly larger than the finished moisture content Me, e.g.
Display the value of Me+0.1.

In addition, if the average moisture content sn falls below the finished moisture content Me for N times in a row, the finished moisture content
Me is displayed on the display 19 and the drying operation of the dryer is immediately stopped.

In this way, in the present invention, the moisture content of the grains being dried is measured at fixed time intervals using an automatic moisture meter, and the moisture content value calculated each time based on the measurement data is displayed on the digital display. In a grain dryer that stops drying when the value falls below the target finished moisture content a predetermined number of times in a row, even if the average moisture content falls below the target finished moisture content, the number of times it falls below the target finish moisture content is Until the predetermined number of times N has been reached, a higher value than the target finished moisture content is displayed, so there is no need for the operator to manually stop the dryer from the display, and the drying will automatically stop. The effect is that drying can be continued reliably until drying reaches a predetermined final moisture content.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of a grain dryer according to an embodiment of the present invention, Fig. 2 is a cross-sectional plan view taken along the - line, Fig. 3 is a functional block diagram thereof, and Fig. 4 is a flowchart showing a control procedure. It is.

Claims (1)

[Scope of Claims] 1. An automatic moisture meter that measures the moisture content of grains at fixed time intervals; and an average that uses the measurement output of the automatic moisture meter as an input signal and calculates the average moisture content by moving the signal values. a moisture content calculation means; a finishing moisture content setting means for setting a target finishing moisture content and outputting a finishing moisture content signal according to the set moisture content; and an average moisture content signal output by the average moisture content calculation means. a comparison means for comparing the values of and the finished moisture content signal and generating an output signal according to the comparison result; and using the output signal of the comparison means as an input signal, when the average moisture content exceeds the finished moisture content, , outputting a display signal that should display a value equal to the average moisture content;
Further, a display value determining means for outputting a display signal that should display a value larger than the finish moisture content when the average moisture content is lower than the finish moisture content and the number of consecutive times does not reach a predetermined number of times; A moisture content display device for a grain dryer, comprising a display that digitally displays the moisture content in accordance with the display signal of the determining means.