JPH0815562B2 - Rice milling machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rice milling machine for treating brown rice into polished rice.

2. Description of the Related Art Conventional rice milling machines generally have a structure as shown in FIG. 3, for example. In FIG. 3, the feed roll 42 and the whitening roll 43 are arranged inside the whitening pipe 41, and the whitening pipe 41
A restricting plate 45 for restricting the cross-sectional area of the passage is provided at the outlet 44, and is configured to be biased by a spring 46 in a direction of closing the outlet 44 so as to maintain a constant lapping accuracy.

When brown rice is put into the hopper 60 directly connected to the polishing cylinder 41, and the feed roll 42 and the polishing roll 43 are rotationally driven by the motor 47, the brown rice flowing from the hopper 60 into the polishing cylinder 41 is fed to the regulation plate 45 by the feed roll 42. The milled rice is pushed in, and is milled between the net 48 inside the milling cylinder 41 and the milling roll 43 which is rotationally driven, and the milled milled rice is discharged from the outlet 44. Here, when the urging force of the spring 46 is increased, the internal pressure of the whitening cylinder 41 increases and the grinding accuracy increases, and when the urging force is reduced, the internal pressure decreases and the polishing accuracy decreases.

By the way, there is a problem that skill is required to adjust the biasing force of the spring 46 to achieve the desired lapping accuracy and the operability is poor. Therefore, as shown in FIG. And the torque sensor 51 is arranged in the middle of the transmission path to the whitening roll 43, and the output signal of the torque sensor 51 is input to the controller 54 that controls the moving means 53 that adjusts the position of the reaction force receiver 52 of the spring 46. The present applicant has previously proposed a technique for automatically adjusting the urging force of the spring 46 by adjusting the position of the reaction force receiving 52 by the moving means 53 so that the load torque corresponding to the target rolling accuracy acts on the whitening roll 43. is suggesting.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Even if the urging force of 46 is adjusted, it is difficult to maintain a constant level of precision, and it is necessary to reset the optimum urging force of the spring 46 each time according to the temperature and moisture content of the brown rice to be processed. Is.

It is an object of the present invention to provide a rice milling machine that can make the polishing accuracy constant without changing the setting or adjusting operation even if the temperature or moisture value of the brown rice to be treated varies.

Means for Solving the Problems The rice polishing machine of the present invention has a torque sensor interposed in a power transmission path that rotationally drives a whitening roll disposed inside a whitening cylinder, and according to a detected torque value of the torque sensor. In addition to controlling the opening degree of the polished rice outlet of the polishing unit, a constant flow rate supply device is provided on the brown rice supply side of the polishing unit to flow a specified amount of brown rice toward the polishing unit per unit time. Characterize.

Operation According to this configuration, the opening degree of the white rice outlet of the whitening tube portion is controlled according to the detected torque value of the torque sensor, and the constant flow rate feeding device directs a prescribed amount of brown rice toward the whitening tube portion per unit time. Shed. Therefore, the opening degree of the white rice outlet of the whitening tube portion is controlled in a state where a certain amount of brown rice is surely supplied to the inside of the whitening tube regardless of variations in the temperature and moisture value of the brown rice to be processed.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes a main body casing, which is constructed by sequentially fitting and connecting an upper casing 2, a whitening tube portion 3, an intermediate casing 4 and a lower bearing casing 5 from the upper part to the lower part, and mutually fitting and connecting them. Are configured so that their axes coincide with each other. A screw feeder 6 for supplying brown rice is connected to an opening formed on one side of the upper portion of the upper casing 2. 7 is a hopper for charging the brown rice, and 8 is a drive motor. Here, the drive motor 8 used is one that rotates at a constant speed, and the screw feeder 6 driven by this drive motor 8 can reliably measure a fixed amount regardless of variations in the temperature and moisture content of the brown rice to be processed. Cut the brown rice from the hopper 7 and polish the white barrel 3
Send to.

Reference numeral 9 is a rotary shaft composed of a hollow shaft disposed at the axial center position over the upper casing 2, the whitening cylindrical portion 3 and the intermediate casing 4, and the feed roll 10 is substantially whitened in the upper casing 2. The whitening roll 11 is fitted and mounted so as to substantially correspond to the tubular portion 3. These feed rolls
10 and the whitening roll 11 are connected to each other by a connecting pin 12, and the position near the lower end of the whitening roll 11 is fixed to the rotary shaft 9 by a key 13.
Are circumferentially engaged with. Further, a cylindrical recess 14 is formed at the lower end of the whitening roll 11, and a fitting cylinder portion 16 extending above the opening degree regulating member 15 is vertically slidably fitted therein. The outer peripheral surface of the opening degree regulation member 15 is formed as a cylindrical surface having an appropriate width in the vertical direction. Further, the fitting cylinder portion 16 has an inner peripheral surface which is tapered downward so that the upper end thereof has a pointed shape, and the bran adhered to the peripheral surface of the cylindrical recess 14 at the lower end portion of the whitening roll 11 is provided. While being scraped off, the bran is not caught between the bottom surface of the cylindrical recess 14 and the upper end of the fitting cylinder portion 16. A net 17 is disposed inside the polishing unit 3 at an appropriate interval with respect to the outer periphery of the polishing roll 11, and an outlet 18 for the bran generated during rice polishing is provided on one side of the lower periphery of the polishing unit 3. It is open. Further, a white rice outlet forming member 19 is arranged between the lower end of the polished white tube portion 3 and the upper end of the intermediate casing 4. The inner periphery of the white rice outlet forming member 19 is formed as a sharp edge, and is fitted to the outer peripheral surface of the opening regulating member 15 having a suitable width in the vertical direction.

A white rice discharge opening 20 is provided on one side of the upper end of the intermediate casing 4.
Is formed and a chute 21 is attached. Further, the rotary shaft 9 is provided with a flange 22 for receiving the white rice dropped from the white rice outlet forming member 19 and guiding it to the chute 21. A support shaft 23 rotatably supported by a pair of upper and lower bearings 24 is provided at an intermediate portion of the intermediate casing 4, and a lower end portion of the rotary shaft 9 is fitted and fixed. A torque sensor 25 is arranged in the lower portion of the intermediate casing 4, and one end shaft 25a of the torque sensor 25 is slidably fitted to the support shaft 23 only in the axial direction.

A drive shaft 27 rotatably supported by a pair of upper and lower bearings 26 is disposed in the lower bearing casing 5, and the other end shaft 25b of the torque sensor 25 is slidable only in the axial direction on the upper end thereof. The drive pulley 28 is fixed to the lower end portion of the drive shaft 27 which is fitted to and which projects downward. The drive pulley 28 is rotatably driven by a motor (not shown) via a drive belt.

An opening degree adjusting shaft 29 is inserted into the hollow rotating shaft 9, and a lower end portion of the opening adjusting shaft 29 and the opening degree regulating member 15 are formed in the elongated hole 31 formed in the rotating shaft 9.
Are connected by a connecting member 30 penetrating through. Opening adjustment axis
The upper end of 29 is engaged with the upper surface of an engaging member 34 supported on the elevating member 32 via a spring 33 so as to be relatively rotatable. The elevating member 32 is configured to be movable up and down by the elevating means 35, and the elevating means 35 is driven and controlled by the control means 36 to which the output signal from the torque sensor 25 is input.

As shown in FIG. 2, the elevating means 35 is composed of a feed screw shaft 38 which is rotationally driven by a drive motor 37, a movable nut body 39 screwed to the feed screw shaft 38, and a guide rod 40 thereof, and is movable. The nut body 39 is connected to the elevating member 32.

According to the above configuration, in a state in which the rotary shaft 9 is rotationally driven by the drive pulley 28 via the drive shaft 27 and the torque sensor 25 by the drive pulley 28, a fixed amount of brown rice is quantified per unit time by the screw feeder 6 from the hopper and the upper casing 2 When it is put into the inside, the brown rice is pushed into the whitening tube portion 3 by the feed roll 10, and whitening processing is performed between the rotating whitening roll 11 and the net 17.

In addition, the bran separated by the whitening treatment passes through the rotation shaft 9 and the through holes (not shown) formed in the whitening roll 11 through the net 17 through the net 17. The bran is discharged to the outside together with the airflow flowing toward the outlet 18. Polished white rice is the net 17 of the whitening barrel 3 and whitening roll
Sequential payment from an annular passage formed between the outer periphery of the opening degree regulating member 15 and the white rice outlet forming member 19 pressed down against the urging force of the spring 33 by the pressure of brown rice pumped into the space between 11 It is discharged from the white rice discharge port 20 through the chute 21 to the outside.

If the accuracy is higher than the set value, the load torque acting on the whitening roll 11 becomes large, and the output signal from the torque sensor 25 becomes excessively larger than the set value.
The elevating member 32 is lowered by the elevating means 35 in response to a command from the control means 36, the upward biasing force of the opening adjusting shaft 29 by the spring 33 is reduced, the opening regulating member 15 is lowered, and the opening is increased. And the precision of adjustment is lowered. On the other hand, if the accuracy of the blade is low, the output signal from the torque sensor 25 will be too small.
The elevating member 32 is raised by the elevating means 35, and the opening regulating member 15
Is increased, the opening is reduced, and the accuracy of the bowling is adjusted to be high. Thus, if the flow rate of the brown rice from the hopper 7 to the whitening tube portion 3 is constant and the operation is performed while controlling the biasing force of the opening degree regulating member 15 based on the torque value detected by the torque sensor 25, it will be processed. Regardless of the temperature, moisture value, grain size, etc. of brown rice to be used, it is possible to adjust the target torque value (setting torque value to be compared with the above-mentioned detected torque value) according to the target accuracy, without adjusting operation. Can be constant.

Although the constant speed motor is used as the drive motor 8 of the screw feeder 6 in the above-described embodiment, the actual rotation of the drive system of the screw feeder 6 is detected and the drive rotation speed is controlled to approach the target set value. It is also possible to use a variable speed motor capable of

In the above embodiment, the drive motor 8 is used as the constant flow rate supply device.
Although the screw feeder 6 driven by this is used, the same applies when a rotary valve is used instead of the screw feeder 6.

EFFECTS OF THE INVENTION As described above, according to the present invention, a torque sensor is provided in a power transmission path that rotationally drives a whitening roll disposed inside a whitening tubular portion, and the torque sensor is provided according to the detected torque value of the torque sensor. In addition to controlling the opening of the white rice outlet of the whitening tube, a constant flow rate supply device is installed on the brown rice supply side of the whitening tube to flow a specified amount of brown rice toward the whitening tube per unit time. Since the whitening process is performed while the flow rate of brown rice to the tube is constant, the target is set without changing or adjusting the target torque value according to the temperature, grain size, moisture, etc. of the brown rice to be whitened. It is possible to obtain polished rice with a high degree of accuracy, and the operability is further improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a rice polishing machine according to an embodiment of the present invention,
FIG. 2 is a side view of the drive mechanism of the opening degree regulating member, and FIG. 3 is a schematic configuration diagram of a conventional example. DESCRIPTION OF SYMBOLS 1 ... Main body casing, 3 ... White cylindrical part, 6 ... Screw feeder, 7 ... Hopper, 8 ... Drive motor, 9 ... Rotating shaft,
10 ... Feed roll, 11 ... Whitening roll, 25 ... Torque sensor,
27 ... Drive shaft.

Claims (1)

[Claims] 1. A torque sensor is provided in a power transmission path for rotationally driving a whitening roll arranged inside a whitening cylinder.
In addition to controlling the opening degree of the white rice outlet of the whitening tube portion according to the detected torque value of the torque sensor, the brown rice supply side of the whitening tube portion is supplied with a specified amount of brown rice toward the whitening tube portion per unit time. A rice polishing machine equipped with a constant flow rate supply device.