JPH083477B2 - Electrode roll in grain moisture analyzer - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electrode roll in a grain moisture measuring device.

[Problems to be Solved by Prior Art and Invention]

For example, a moisture measuring device for converting the electrical resistance value of the crushed grain into a voltage value by converting the electrical resistance value of the crushed grain into a moisture value while inducing each sample grain between a pair of electrode rolls separated by a minute interval and crushing the sample grain. In order to smoothly bite the test grain by forming irregularities on the peripheral surface of the electrode roll, depending on the size of the test grain, the crushing process is not possible if the interval is fixed. It may be appropriate. That is, when the interval is set for standard-sized paddy, barley having a large particle size is stagnant in the V-shaped space formed by the left and right electrode rolls and the biting property is poor, and in order to deal with this, For example, there are forms such as expanding the electrode roll diameter (Fig. 10 (a)) or widening the electrode roll interval (Fig. 10 (b)). In the former case, the output voltage characteristics are stable, but the size of the device is large. In the latter case, the output voltage characteristics are inferior even though it is difficult to support standard grain size grains. Further, as described in Japanese Utility Model Laid-Open No. 58-136768, projections are provided on the outer peripheral surfaces of a pair of cylindrical electrodes at appropriate intervals in the circumferential direction, and they engage with each other like a gear so that the grains are adjacent to each other. There is a form configured to fit between the protrusions, but in this form the contact area between the grain and the electrode in the crushed state is expanded, so the recess formed between the protrusions fits the grain. It is deeply formed. The left and right electrodes are formed to have the same outer peripheral speed, and the test particles are not crushed at different peripheral speeds, and no consideration is given to the trapping of the test particles that originally stagnates in the V-shaped space.

[Means for solving problems]

Therefore, the present invention is a moisture measuring device for converting the electric resistance to a moisture value by crushing one grain of the test grain while reversing the pair of left and right electrode rolls 21, 21 at different peripheral speed differences from each other. The electrode rolls 21, 21 are formed on the uneven surface of the peripheral surface, and the deep grooves 27, 27 substantially along the roll rotation axis direction are formed on the peripheral surface at a depth equal to or less than the thickness of the test grain. The electrode roll of the grain moisture measuring device is as follows.

[Operation and Effect of the Invention] When a measurement signal is output during drying, the electrode roll of the moisture meter and the unit grain feeding device are activated, and the electrode roll is converted into moisture for each unit test grain guided and guided by this feeding device. An electrical signal for use in processing and processing the signal to calculate a moisture value. This moisture value is used for controlling the drying speed, controlling the completion of drying, and the like.

During this moisture measurement operation, the test particles from the single particle feeding device 20 reach the upper space formed by the pair of electrode rolls 21 and 21. The surface of these electrode rolls 21 and 21 has irregularities so that the biting of the test particles is good, and the electrode rolls 21 and 21 crush the test particles while rotating at different peripheral speeds to obtain electrical resistance. Although it is possible to obtain a value, when long and large diameter test particles are supplied onto the electrode rolls 21,21, they are formed by both rolls 21,21 without being bitten by such irregularities alone. Trying to stagnate in V space. However, deep grooves 27, 27 are formed on this surface, and the test grains in the sideways posture are easily engaged with the sharp portions of the deep grooves 27, 27 on the peripheral surface side of the roll 21, which causes the electrode roll 21 to rotate. Rotate around other electrode roll
Since it will be crushed between 21 and 21, the crushing process of the test grain can be performed accurately.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

1 is a machine frame of a grain dryer, which comprises a storage tank 2 in the upper part, a drying chamber 3 in the middle part, and a grain collecting chamber 4 in the lower part, which are vertically installed. An elevator 5 is installed upright to lift and return the collected grains to the storage tank 2 on one side. In addition, drying room 3
Comprises downflow passages 10, 10 formed between a hot air chamber 7 leading to the furnace 6 and an exhaust air chamber 9 leading to an exhaust fan 8. When passing through the downflow passages 10, 10, hot grains are exposed to the hot air. It is a known structure for drying by drying.

Inside the elevator 5, there is a belt 11 which is wound around upper and lower drive pulleys and driven pulleys, and buckets 12, 12, ... Are arranged on the belt 11 at regular intervals. This bucket 1
2, 12 ... Scoop up the grains transferred to one side by a transfer spiral 13 provided laterally in the lower part of the grain collecting chamber 4 and transfer them upward, and from the transfer end part of the forward stroke to the throwing port part. It is a structure that jumps out to 14. Reference numeral 15 is an upper transfer spiral that horizontally receives and receives the splashed grains, and 16 is a diffuser that is arranged in the center of the upper portion of the storage tank 2 so as to rotate about the vertical axis.

The elevator 5 is provided with a moisture meter 17. The moisture meter 17 includes a funnel-shaped grain intake portion 19, which communicates with a side wall opening 18 of the elevator 5, a single grain feeding device 20 and a pair of electrode rolls 21, 2.
It is composed of a main body 22 having 1 and the like, and a reducing section 23 for reducing the test particles into the elevator 5. Of these, one grain feeding device 20
From the feeding roll 25 having a spiral groove 24 capable of fitting one grain on the peripheral surface and rotating in a fixed direction, and a fixed conveying plate 26 approaching in the tangential direction of the feeding roll 25. In this structure, the spiral groove 24 and the transport plate 26 receive one grain and transfer it in the axial direction of the feeding roll 25. Incidentally, the feeding roll
The transfer start end, which is the same as that of the above grain intake part 18 of 25, is formed to have a large diameter so that the test grains can be deposited, and the excess grain is formed downward from the intermediate part to the transfer end part by forming a small diameter. It is configured to be discharged.

The electrode rolls 21 and 21 are located below the transfer end portion of the single grain feeding device 20, and are rotationally interlocked in the opposite directions with different peripheral speed differences.

On each peripheral surface of the electrode rolls 21, 21, the lower layer is plated with electroless nickel and the upper layer is plated with hard chrome, respectively, of which the upper layer is a module about 0.5, pitch about 1.5 mm twill knurled, the central part Are formed so as to be arranged in a zigzag pattern. Further, on the surface of each roll 21, 21, there is a deep groove 27 having a V groove angle α of about 90 ° and a depth s of about 0.8 mm.
27 is formed along the axial direction.

28, 28, electrode rolls 21, 21 from the end of the single grain feeding device 20
A ridge formed inwardly on the guide walls 29, 29 partitioning the front and rear of the sample grain to be dropped and guided in the upper space a, and the grain trying to enter between the electrode rolls 21, 21 in the standing posture in the space a. (Fig. 9 (a)) is turned over when moving to both end sides of the electrode rolls 21, 21 (Fig. 9 (b)), and the biting property to the electrode rolls 21, 21 is made good.

Reference numeral 30 is a motor for rotationally driving the feeding roll 25 and the electrode rolls 21, 21.

FIG. 8 is a block circuit diagram showing the electrode rolls 21 and 2 described above.
The electrical resistance value of the test particles crushed during 1 is converted into a voltage value by the resistance-voltage converter 31, and this output voltage Er is input to the CPU 33 via the A / D converter 32. The CPU 33 mainly has the following functions. That is, the water content measurement signal is output at predetermined intervals, and the motor 30 is normally rotated. An output voltage for a preset number of grains (for example, 128 grains) is fetched. For each output voltage Er value, the moisture value was calculated based on the following calculation formula M = κEr + M ₀ −A (TG−20 ° C.)% (Κ · A · M ₀ is a constant, TG is the test grain temperature) , An average moisture value M of 128 grains is calculated. A moisture measurement end signal is output, and the motor 30 is output in reverse rotation for a certain period of time. The average moisture value M is displayed and output on the digital display unit 34. On the other hand, the drying loss ratio is calculated from the difference between the average moisture content M and the previous average moisture content M, and compared with a preset drying loss percentage to output an increase / decrease signal of the fuel supply to the furnace. The average moisture value M and the preset finishing moisture value ML
Is compared, and if less than this, a dry end signal is output.
Etc.

 The operation of the above example will be described.

A predetermined amount of grain is loaded into the storage tank 2 by using the elevator 5 from the loading hopper (not shown). Then, the grain type, the finishing moisture MS, etc. are set and the drying operation is started. The grains in the storage tank 2 are exposed to hot air while flowing down the drying chamber 3 and reach the grain collecting chamber 4. It is transferred to one side by the lower transfer spiral 13 and is fried by the buckets 12, 12 ... of the elevator 5 and reaches the storage tank 2 again, where it is subjected to tempering for a while.

During such a drying operation, the motor 30 of the moisture meter 17 is operated at preset measurement intervals to measure moisture, and the hot air temperature is controlled while monitoring the drying loss rate. Then, when the finish moisture value is reached, the drying operation is finished.

When the measurement signal is input to the moisture meter 17, the motor 30 is activated and the feeding roll 25 and the electrode rolls 21 and 21 are normally rotated. Grains that are continuously taken into the moisture meter 17 through the opening 18 of the elevator 5 are guided between the feeding roll 25 and the transport plate 26, and a plurality of grains are deposited on the transfer start side of the feeding roll 25 while spiraling. One grain fitted into the groove 24 is transferred toward the terminal end side while being received by the transport plate 26 as a grain to be tested. While crushing the test particles sequentially delivered at intervals of 3 to 4 seconds with the electrode rolls 21 and 21, the output voltage Er is converted into a moisture value, and a predetermined particle, for example, 128
The average water content of the grains is calculated.

During the water content measuring operation, the test particles from the single particle feeding device 20 fall apart from the end portion of the feeding roll 25 and fall in the space formed by the guide walls 29, 29 between the pair of electrode rolls 21, 21. Reach The surface of each of these electrode rolls 21 and 21 has been subjected to a twill knurling treatment, so that the test particles are well caught. The electrode rolls 21 and 21 can rotate at different peripheral velocities while crushing the sample grains to obtain an electric resistance value. By the way, when the test particles having a long diameter and a large diameter are supplied onto the electrode rolls 21 and 21, they are not caught only by the unevenness due to the twill knurls and try to stay in the V space formed by the rolls 21 and 21. To do. However, this surface has deep grooves 27, 27
Is formed, the test grain in the sideways posture is the deep groove 27,2
7 easily engages with the sharp portion on the peripheral surface side of the roll 21, and the electrode roll 21 is rotated and crushed with other electrode rolls 21.

It should be noted that if the test particles stagnate in the V space in the standing posture, it is difficult to directly engage the deep grooves 27, 27 with each other, but in the standing posture, the recesses and protrusions on the surface of the electrode rolls 21, 21 act in the roll axial direction. Is easily moved, so that the upper side is brought into contact with the ridges 28, 28 and falls down, so that the above-mentioned deep grooves 27, 27 are easily affected.

In the present embodiment, the deep grooves 27, 27 are formed in the V-shaped cross section, but the present invention is not limited to this and various modifications can be carried out within the range having the above-mentioned action.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is an overall front view, FIG. 2 is a sectional view thereof, FIG. 3 is a front view of essential parts, and FIG. 4 is a perspective view of an electrode roll. Figure 5 is its side view, 6th
FIG. 7 is a front view thereof, FIG. 7 is a partially enlarged view thereof, FIG. 8 is a block circuit diagram, and FIGS. 9 (a) and 9 (b) are side views of main parts.
10 (a) and (b) are diagrams showing a conventional example. In the figure, 17 is a moisture meter, 18 is an opening, 20 is a unit grain (single grain) feeding device, 21 and 21 are electrode rolls, 24 is a spiral groove, 25 is a feeding roll, 26 is a conveying plate, 27 and 27. Indicates a deep groove, and 33 indicates a CPU.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Taiichi Mori 1 Hachikura, Tobe-cho, Iyo-gun, Ehime Pref. Iseki Agricultural Machinery Co., Ltd. Technical Section Examiner Toshimitsu Suzuki (56) Bibliography 58-136768 (JP, U)

Claims (1)

[Claims] 1. A moisture measuring device for crushing one grain of a test grain while reversing a pair of left and right electrode rolls 21, 21 with different peripheral speed differences and measuring the electric resistance of the grain for conversion into a moisture value. The electrode rolls 21 and 21 are formed with a concave and convex peripheral surface, and the peripheral surface has deep grooves 27 and 2 substantially along the roll rotation axis direction.
7 is an electrode roll in a grain moisture measuring device formed to a depth equal to or less than the thickness of the test grain.