JPH0317536B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a circulating rice mill for milling paddy or brown rice.

Conventional technology In conventional circulation-type rice milling machines, there is a manual shutter in the drop passage from the circulation tank to the milling room, and circulation can be started or stopped by opening or closing it artificially. In addition, in the case of paddy milling, the surface friction force is greater than in brown rice milling, and due to the inclusion of straw waste, etc., there is a risk that the paddy will get stuck between the falling passages and not flow down if the shutter plate is opened at an opening suitable for brown rice, etc. Therefore, by adjusting the opening of the shutter plate each time depending on whether the target of polishing is paddy or brown rice,
The grain flow rate is adjusted. However, since this manual adjustment of the shutter opening is performed based on the operator's intuition, it has been difficult to accurately perform minute adjustments, such as adjusting the shutter plate by 2 mm.

Therefore, an automatic shutter opening adjustment method using a solenoid has been adopted. This method is
As shown in No. 62-14950, a tension spring is connected to one end and indexed in the direction of closing the entrance to the milling room, and a solenoid rod is connected to the other end and the solenoid is energized to create a circulation shutter using magnetic force. It indexes in the opposite direction to the tension spring and moves through the hole to open the entrance.

Problems to be Solved by the Invention Since the conventional automatic shutter opening adjustment method uses a solenoid, the shutter is either fully open or fully closed. Therefore, it is not possible to adjust the shutter opening between fully open and fully closed, such as half-open, so it is not possible to finely adjust the shutter opening depending on the type of grain or the like.

In addition, in the conventional example, the square through hole gradually moves into the entrance of the rice milling room and becomes fully open, but when the shutter starts to open, a part of the through hole that opens into the entrance of the rice milling room, that is, a rectangular shape. Grains, etc. suddenly fall into the rice milling room from the grain passage area. Therefore, in the initial stage of startup, the rice milling motor may be overloaded.

In view of the above circumstances, it is an object of the present invention to automatically and accurately obtain an arbitrary shutter opening. Another purpose is to avoid overloading the milling motor during the initial stages of opening the shutter.

[Means for Solving the Problems] The present invention provides a circulating rice mill that adjusts the shutter opening degree by sliding a shutter plate provided on the back surface of an inclined plate. A guide plate and a support member are provided in sequence toward the front, a movable plate with a contact plate having a width narrower than the shutter plate is provided on the guide plate, a limit switch is provided on the guide plate, and a spring is provided between the support member and the contact plate. The contact plate is brought into pressure contact with the operating contact of the limit switch by interposing the movable plate, and the tip of the movable plate is made to protrude from the tip of the shutter plate, and the support member is connected to a shutter motor via a screw moving mechanism. The above object is achieved by connecting the motor to a control device.

[Operation] When the type of grain, etc. is instructed to the control device, the control device drives the motor for a predetermined period of time. The screw movement mechanism is actuated by the drive of this motor, and the shutter plate slides. When the motor is stopped in response to an instruction from the control device, the shutter plate also stops sliding, and the shutter opens to the set opening degree. Next, when closing the shutter, the motor is driven by instructions from the control device, the shutter plate slides via the screw moving mechanism, and first, the movable plate protruding from the tip of the shutter plate is moved by the action of the spring. The tip touches the circulation tank wall. Then, when the shutter plate further slides in the same direction and its tip contacts the wall surface, the contact plate and the operating contact of the limit switch separate, so the motor stops and the shutter is fully closed.

Furthermore, when opening the shutter, the motor rotates in the opposite direction according to instructions from the control device, and the shutter plate is slid in the opposite direction via the screw movement mechanism. At the initial stage when the shutter plate starts sliding, the shutter plate gradually separates from the tank wall surface, but the tip of the movable plate maintains a state in which it is in contact with the wall surface. Therefore, the raw material supply space formed between the tip of the shutter plate and the tank wall is partially blocked by the tip of the movable plate, so the amount of raw material supplied at the initial stage when the shutter is opened is will be a small amount.

When the shutter plate slides in the same direction, the spring returns to its original state and the contact plate and the operating contact of the limit switch come into contact. Furthermore, when the shutter plate slides in the same direction and the shutter is fully opened, the motor is stopped by an instruction from a limit switch fixed to the support member.

Embodiment An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. A small drive motor 3 for driving the shutter opening/closing device 2 provided in It consists of a power transmission device 5, and more specifically, a shutter opening/closing device 2.
1 and 2, the shutter plate 1 is slidably provided on the back surface of the inclined plate 6, as shown in FIGS. 1 and 2. a guide plate 8 fixed to the rear surface of the shutter plate 1 with a gap l between it and the shutter plate 1; a movable plate 9 slidably provided within this gap L; An L-shaped contact plate 10 provided at the end of the plate 9 on the supporting member 7 side, a spring 11 interposed between the L-shaped contact plate 10 and the supporting member 7, and each of the supporting member 7 and the guide plate 8. Limit switch 1 fixed to
It consists of 3 and 14.

Further, as shown on the left side of FIG. 1, the control device 4 receives output signals from a microcomputer (hereinafter referred to as microcomputer) 15 having a memory and calculation function and controls the drive of the small drive motor 3. It consists of a controller 16.

The power transmission device 5 also includes a small gear 18 fixed to the shaft of a small drive motor 3 fixed to a mounting base 17 fixed to the back surface of the tilting plate 6.
, a large gear 19 meshing with this, a female thread 24 provided in a hole perpendicularly penetrating the shaft of a round bar 22 provided through both side plates of the support member 7 of the shutter plate 1, and this female thread 24. The rotary shaft 21 has male right-hand threads 23 that engage with each other on the outer periphery of the shaft, and is rotatably attached to the large gear 19 via bearings 20a and 20b. Note that the female screw 24 and the male screw 23 for converting the rotational force of the motor into sliding force are referred to as a screw movement mechanism.

Next, to describe the effects of the example, the third
As shown in the figure, the grains of paddy and brown rice put into the circulation tank 25 pass through the drop opening 26 and enter the milling room 27.
At this point, the chaff and part of the rice bran are peeled off. The peeled chaff, rice bran, and grains circulate through the vertical milling room 28 and the circulation tank 25 in the direction of arrow B.
It falls again from the drop port 26 to the wind sorting section 29, and in the wind sorting section 29, the suction wind 30 sucks up light paddy hulls, rice bran, etc., and after sorting it, it is discharged outside the machine, and heavy paddy is removed. The rice and brown rice fall into the milling chamber 27 again, are polished by the milling rolls 31 and are pumped out, and together with the newly formed paddy hulls and rice bran rise through the vertical milling chamber 28 and move inside the circulation tank 25 as shown by arrow B. It is refined while circulating. This process is repeated and the whitening gradually progresses.

Note that numerals 31, 32, and 33 each represent a polishing roll suction blower rice polishing motor, and part A represents a flow rate regulating device of the present invention (detailed view is shown in FIG. 1).

Next, as shown in FIG. 1, when the small drive motor 3 is switched on and rotated clockwise as viewed from the motor body, the large gear 19 rotates counterclockwise, and the male right-hand screw 23 integral with the rotating shaft 21 rotates counterclockwise.

As a result, the female thread 24 cut into the round bar 22 which is engaged with the male right-hand thread 23 tends to slide in the direction of arrow C.

Therefore, the round bar 22 functions as a nut and similarly slides in the C direction. Since the round bar 22 is inserted into the U-shaped support member 7, the support member 7 is guided by the rails 12a and 12b on the back side of the inclined plate 6 together with the shutter plate 1 to which it is fixed, and is moved in the direction of arrow C. slide.

As the shutter plate 1 slides, the guide plate 8 fixed to the shutter plate 1, the movable plate 9, and the limit switch 13 also slide in the direction of arrow C at the same time.

When the shutter plate 1 comes into contact with the fuselage wall surface and the opening degree becomes zero, the movable plate 9 protrudes by a length S from the tip of the shutter plate 1, so the movable plate 9 closes the gap L while compressing the spring 11. slide between.

At this time, the operating contact 13 of the limit switch 13
a and the L-shaped contact 10 of the movable plate 9 are separated, the current to the small drive motor 3 is cut off, and the shutter plate 1 is fixed while remaining closed.

When a reverse current is applied to the small drive motor 3 via the control device using a dial (not shown) provided on the control device 4, the rotation of the small drive motor 3 becomes counterclockwise, contrary to the above, and the shutter plate 1 moves in the direction of arrow b. The operating contact 14a of the limit switch 14, which slides in the direction and is fixed to the head of the support member 7, and the L-shaped holder 3
When the operating contact receiver 14b of the limit switch 14, which is fixedly provided at the shutter plate 4, is connected, the reverse rotation current is cut off and the shutter plate 1 stops at the fully open position.

In addition, in order to stop the shutter plate 1 at an arbitrary position midway, the time required for the opening degree to go from zero to fully open is multiplied by the ratio of the fully opened distance to the arbitrary opening distance.
The small drive motor 3 may be rotated by the control device.

As a result of the above, if operations such as brown rice polishing, paddy rice polishing, finishing, discharge, and stoppage are input to the microcomputer 15 of the control device 4, the computer 15 will:
This is identified and output to the controller 16, and the controller 1
6 controls the rotation direction, rotation time, etc. of the small drive motor 3, and the opening/closing and opening degree of the shutter plate 1 can be freely and automatically adjusted.

Effects of the Invention Since the present invention is constructed as described above, it has the following remarkable effects.

Since the shutter motor is connected to the control device, if you set the motor rotation time etc. according to the type of grain etc. in the control device, the motor will drive according to the instructions, operate the screw moving mechanism, and set. Move the shutter board into position. Therefore, the shutter can be accurately adjusted to the set opening degree.

Since the shutter plate is slid using a screw movement mechanism, it is easy to make precise fine adjustments. Therefore, even a small amount of sliding of the shutter plate, for example, a movement distance of 2 mm, can be performed accurately, so that the shutter opening can be accurately performed as set.

A spring is interposed between the support member and the contact plate to press the contact plate into contact with the operating contact of the limit switch, and the tip of the movable plate is made to protrude from the tip of the shutter plate, so that when the shutter is closed, the movable plate is pressed against the operating contact of the limit switch. After the tip of the shutter plate comes into contact with the tank wall, the tip of the shutter plate comes into contact with the wall, and the contact point of the limit switch is mechanically separated. Therefore, when the shutter is fully opened, the switch is immediately turned off and the motor stops. Therefore, since the shutter plate stops sliding immediately, the tank wall surface is not damaged or an excessive load is not placed on the motor etc. due to the shutter plate protruding too much.

The movable plate is narrower than the shutter plate, and its tip protrudes beyond the tip of the shutter plate, so when the shutter is opened, the shutter plate recedes and gradually moves away from the tank wall, but at the initial stage, it is not movable. Since the tip of the plate is in contact with the wall surface, a part of the raw material supply space formed between the tip of the shutter plate and the tank wall is closed off by the tip of the movable plate. For that reason,
At the initial stage of opening the shutter, a large amount of grain is not suddenly supplied to the dropping port, so no excessive load is applied to the rice milling motor.

[Brief explanation of the drawing]

Figure 1 is a front view of an embodiment of the present invention installed on the inclined plate of a circulating rice mill, Figure 2 is a sectional view taken along the - line in Figure 1, and Figure 3 is a diagram of the circulating rice mill equipped with the present invention. FIG. 1... Shutter plate, 2... Shutter opening/closing device,
3...Small drive motor, 4...Control device, 5...
Power transmission device, 13, 14...limit switch.

Claims (1)

[Claims] 1. In a circulating rice mill that adjusts the shutter opening degree by sliding a shutter plate provided on the back surface of an inclined plate, a guide plate and a support member are sequentially provided on the back surface of the shutter plate toward its tip side, and A movable plate with a contact plate having a width narrower than the shutter plate is provided on the guide plate, a limit switch is provided on the guide plate, and a spring is interposed between the support member and the contact plate to make the contact plate an operating contact of the limit switch. The movable plate is brought into pressure contact with the movable plate, and the tip of the movable plate is made to protrude from the tip of the shutter plate, and the support member is connected to a shutter motor via a screw movement mechanism, and the motor is connected to a control device. A flow rate adjustment device for a circulating rice mill.