JP2005169197A - Mill of grain/seed/solid resin or the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a float has to be exchanged for one of a different shape according to a stock since the vertical displacement of the float due to static pressure and dynamic pressure is detected in a state where the float arranged at a central part of a stock hopper is buried in the stock and the displacement is influenced by change in bulk specific gravity, a spatula angle or the like due to the change of the stock and further there is a possibility that inhomogeneous feed by a stock feeding roll is difficult to detect and maintenance cannot be easily performed since the float is buried. <P>SOLUTION: A mill is provided with: a stock hopper 1 with an entrance tube; a stock feeding roll 2; a feeder gate opening/closing means 4 for opening/closing a feeder gate 3; and a pair of pulverizing rolls 5. A level sensor 6 for measuring a stock level Aa is attached, a value measured by the level sensor is inputted into a control means 8, which controls the space between the stock feeding roll and the feeder gate and the contact and separation of a pair of pulverizing rolls. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mill for cereals, seeds, solid resins, etc., for pulverizing cereals, seeds, solid resins, etc., and more specifically, the stock level of a stock that is a powder or a granular material that has flowed into a stock hopper The present invention relates to a mill for cereals, seeds, solid resin, etc., for adjusting the amount of the pulverization roll and supplying it evenly across the width of the grinding roll.

  Conventionally, the means for adjusting the general stock level of this kind of grain, seed, solid resin, etc., is related to the lever mechanism with a float sensor that moves up and down by the flow of the stock in contact with the stock in the stock hopper. In the center of the stock hopper, the vertical movement of the lever mechanism is transmitted to the hydraulic or pneumatic control mechanism, the control mechanism is operated to control the stock feed roll ON or OFF, and the crushing roll gap It controlled the opening and closing of the.

Also, for example, it enables structurally simple product detection in the inflow path for feeding adjustment, detects the weight of the product to be supplied to the feeding cylinder of the cylinder mill, and calculates the result. A control signal can be input to the feeding device via a signal converter (see Patent Document 1), a fixed bearing on the opening side of the notch for rolls provided on the opposite side walls, and a moving bearing on the closing side In a milling roll machine in which at least one pair of rolls that are fixed to each other and mounted at high speeds on fixed bearings and at low speeds on mobile bearings and are rotated at opposite speeds are mounted horizontally. The movable bearing is divided into two parts, and one of the movable bearings is detachably attached to the fixed bearing side, and the other end is pivotally attached to the side wall via a roll opening / closing eccentric ring provided with a roll opening / closing eccentric ring driving means. And roll the other end This roll fine adjustment shaft is engaged with an adjustment shaft, and this roll fine adjustment shaft is connected to a roll fine adjustment eccentric wheel having a roll fine adjustment eccentric wheel driving means provided on the anti-fixed shaft side of the moving bearing via a disc spring ( Patent Document 2), a mechanical sensor and a product supply device, and the product supply device adjusts a supply gap or an adjustable drive means for a supply segment and a grinding roller close to each other. And a product automatic feeding device for a four-roller or eight-roller milling mill comprising a first mechanical signal transmitter for digital signals, comprising: A second mechanical signal transmitter for the analog signal, the speed of the supply roller or the position of the supply segment being adjustable via the analog signal, Septum those which are controllable via the digital signal (see Patent Document 3) are disclosed.
Japanese translation of PCT publication No. 2002-504854 (first page, FIG. 1) Japanese Patent No. 2788059 (first page, FIG. 1) Japanese Patent Application No. 8-32309 (1st page, Fig. 1)

  However, in general means for adjusting the stock level, the float is placed vertically by the center of the stock hopper and the float is always buried in the stock. It is a method of indirectly detecting the stock level by vertical displacement, but the movement of the float is greatly affected by changes in the bulk specific gravity, spatula angle, etc. due to the change in stock. In addition to the need for replacement, the center of the stock hopper has the disadvantage that it is difficult to detect the risk of non-uniform supply in the axial direction of the stock feed roll due to the level drop in the axial direction of the stock feed roll of the accumulated stock. There is a maintenance problem because it is buried inside, and the hydraulic control mechanism is simple despite being expensive and large. The efficient operation becomes controlled only were those is limited.

  Furthermore, it enables structurally simple product detection in the inflow path for feeding adjustment, detects the force applied to the weight sensor of the product to be supplied to the feeding cylinder of the cylinder mill, and In the case where the control signal can be input to the feeder via the signal converter, that is, the strain gauge is a sensor, the rod is fixed to the strain gauge, and the rod flows down on the center line in the stock hopper. It is mounted so as to be buried in the stock where it is buried, and the stock level is indirectly estimated from the pressure of the stock acting on the rod, and the acceleration and deceleration of the feed roll and the separation of the grinding roll are controlled. In addition, it is greatly affected by changes in bulk specific gravity, spatula angle, etc. due to changes in stock, as well as for detection at the center of the stock hopper as described above. Difficult to detect the risk of non-uniform supply of Lumpur in general, in which there are problems also on maintenance.

  Furthermore, the fixed bearing is fixed to the opening side of the roll entrance notch provided on the opposite side wall, and the moving bearing is fixed to the closing side, and the high speed roll is fixed to the fixed bearing, and the low speed roll is set to the moving bearing. In a milling roll machine in which at least one pair of rolls that are attached to each other and rotate opposite to each other are horizontally mounted, each moving bearing is divided into two parts, and one of them is detachable to the fixed bearing side, and the other Is pivotally attached to the side wall via a roll opening / closing eccentric wheel having a roll opening / closing eccentric wheel driving means, and the other end is engaged with a roll fine adjustment shaft. , Which is connected to a roll fine adjustment eccentric wheel having a roll fine adjustment eccentric ring driving means provided on the side of the movable bearing opposite to the fixed shaft via a disc spring, that is, instead of the float, the inlet cylinder of the stock hopper Reflective photoelectric on the outer wall Alternatively, six electrostatic capacity type sensors are provided on the outside of the inlet cylinder in a straight line along the center line of the cylinder at an appropriate interval, and each time the stock level in the hopper approaches the individual sensor without contact with the stock. The signal is collectively connected to the microcomputer, and the output signal of the microcomputer controls the acceleration / deceleration of the stock feed roll and the separation of the crushing roll, but the stock level changes with the outer wall of the stock hopper. The method of detecting the amount of reflected light or change in electrostatic capacity requires the use of highly sensitive and expensive sensors and amplifiers because the outer wall becomes a barrier, and it also takes time to combine six sensors with a personal computer and process data. In addition, it is an expensive method, and only the arrangement range of the sensor head mounted along the vertical center line of the inlet cylinder can be detected. If to the wall side downward inclination may result in a stock into the inlet tube is less even enough, but not easily detect a risk of uneven supply of similarly rolled in general as described above.

  In addition, it comprises a mechanical sensor and a product supply device, the product supply device for adjusting the supply gap or an adjustable drive means for the supply segment and for bringing the grinding roller close to and away from each other In a product automatic feeding apparatus for a four-roller type or eight-roller type milling mill, comprising: a first mechanical signal transmitter for digital signals; and an analog signal A second mechanical signal transmitter, the rotation speed of the supply roller or the position of the supply segment can be adjusted via an analog signal, and the mutual approach and separation of the rollers can be controlled via a digital signal In other words, the amount of operation of the aforementioned lever mechanism of the float is electrically detected instead of the hydraulic or pneumatic control mechanism, acceleration / deceleration control of the feed roll mechanism, crushing But performs a disengaging control Lumpur, in which the aforementioned problems of the float can not be solved.

  In view of the above-mentioned problems, the present invention is a result of diligent research. As a result, the grain, seed, and solid resin milling machine according to claim 1 has a stock hopper with an inlet cylinder, and a stock feed roll that transports the stock of the stock hopper. Grain / seed / solid resin comprising: a feeder gate opening and closing means for opening and closing a feeder gate for adjusting a flow of stock transferred by a stock feed roll; and a pair of grinding rolls for pulverizing the stock that has passed through the feeder gate In a mill such as a machine, a level sensor that measures the stock level of the stock hopper stock is installed, and the value measured by the level sensor is input to the control means that is equipped with an amplifier, and the rotational speed control program set by the control means The feeder roll by means of the stock feed roll speed and the feeder gate opening / closing means. It is intended to control the bets intervals and a pair of grinding rolls disengaging.

  Further, the grain, seed and solid resin milling machine according to claim 2 is the grain, seed and solid resin milling machine according to claim 1, wherein the level sensor uses a reflective ultrasonic level sensor. It is.

  Furthermore, the grain / seed / solid resin milling machine according to claim 3 is the grain / seed / solid resin milling machine according to claim 1 or 2, wherein the stock level is measured by a level sensor. The measured value is converted into a stepwise rotational speed control output signal by the control means through an amplifier, and the converted output signal is input to the speed controller of the geared motor for stock feed roll, and the stock feed corresponding to the stock level It controls the rotation of the roll.

  Furthermore, the grain / seed / solid resin milling machine according to claim 4 is the grain / seed / solid resin milling machine according to claim 1 or 2, wherein the control means is a level sensor. When the measured value of the stock level reaches the lower limit level, the rotation of the stock feed roll is stopped, the feeder gate opening / closing means is operated to close the interval between the feeder gates, and the pair of pulverizing rolls are simultaneously separated.

  Furthermore, the grain / seed / solid resin milling machine according to claim 5 is the grain / seed / solid resin milling machine according to claim 1 or 2, wherein the control means is a level sensor. When the measured value of the stock level rises from the set lower limit level, the stock feeder gate opening / closing means is actuated to separate the feeder gate interval, the stock feed roll is rotated, and at the same time the interval between the pair of crushing rolls is crushed It is something to return to.

  Further, the grain / seed / solid resin milling machine according to claim 6 is the grain / seed / solid resin milling machine according to claim 1 or 2, wherein the control means is a level sensor. When the measured value of the stock level fluctuates up and down between an upper limit value and a lower limit value set in advance, the rotation speed of the stock feed roll that is set stepwise according to the stock level is increased or decreased.

  Furthermore, the grain / seed / solid resin milling machine according to claim 7 is the grain / seed / solid resin milling machine according to claim 1 or 2, wherein the control means is a stock feed roll. When the stock level measured by the level sensor reaches the set upper limit level even though the stock is flowing down at the maximum number of revolutions, the feeder gate opening / closing means is activated to maximize the feeder gate interval. It is spaced apart to discharge the stock and prevent stock overflow.

  Further, the grain / seed / solid resin milling machine according to claim 8 is the grain / seed / solid resin milling machine according to claim 1 or 2, wherein the level sensor is adapted to a temperature change. In addition to providing a guarantee function, an air gun is attached to remove minute amounts of dust adhering to the level sensor.

  The mill for cereals, seeds, solid resin, etc. of the present invention allows the stock level of the inclined portion of the stock in the stock hopper flowing into the pulverizing roll to be accurately and directly detected by a non-contact level sensor. By controlling the rotation speed of the rolls, the distance between the feeder gates, and the separation of the grinding rolls, it is possible to accurately supply the stock to the grinding rolls to the fullest extent, leading to an improvement in the yield of high-quality milling. It is a high invention.

  The present invention relates to a mill for cereals, seeds, solid resins, etc., for pulverizing cereals, seeds, solid resins, etc., and more specifically, the stock level of a stock that is a powder or a granular material that has flowed into a stock hopper The pulverizer for grain, seeds, solid resin, etc. for adjusting the amount of the pulverizing roll to be supplied evenly across the width of the pulverizing roll. A stock hopper 1 with an inlet cylinder 1a for storing stock A, which is a powder or a granule, disposed on the stock hopper, a stock feed roll 2 for transporting the stock A of the stock hopper 1 downward, and transported by the stock feed roll 2 A feeder gate opening / closing means 4 for opening and closing the feeder gate 3 for adjusting the flow of the stock A to be fed, and a pair of crushing the stock that has passed through the feeder gate 3 In a mill for cereals, seeds, solid resin, etc. equipped with a crushing roll 5, a level sensor 6 for measuring the stock level Aa of the stock A in a non-contact manner is mounted on the top of the inlet cylinder 1a of the stock hopper 1, The measured value of the level sensor 6 is input to the control means 8 having an amplifier 7 interposed therebetween, and the rotational speed of the stock feed roll 2 and the feeder gate opening / closing are controlled by a rotational speed control program set stepwise by the control means 8 in advance. The means 4 controls the interval between the feeder gates 3 through which the stock A passes and the separation of the pair of grinding rolls 5.

  Furthermore, the grain / seed / solid resin milling machine according to claim 2 is the grain / seed / solid resin milling machine according to claim 1, wherein the level sensor 6 is a reflection type ultrasonic level sensor. The stock A is attached to a mounting hole provided at a position shifted in the axial direction of the stock feed roll 2 from the center of the ceiling plate of the inlet cylinder 1a of the stock hopper 1, and the accumulated stock A flows out. Thus, the stock level Aa at one point of the portion of the stock feed roll 2 inclined downward in the axial direction is measured.

  Further, the grain / seed / solid resin milling machine according to claim 3 is the grain / seed / solid resin milling machine according to claim 1 or 2, wherein the level sensor 6 is used to store the stock level. Aa is measured, and the measured value is converted into a stepwise rotational speed control output signal by the control means 8 via the amplifier 7, and the converted output signal is sent to the speed controller 2b of the stock feed roll geared motor 2a. This is input to control the rotation of the stock feed roll 2 in accordance with the stock level Aa.

  Further, the grain / seed / solid resin milling machine according to claim 4 is the grain / seed / solid resin milling machine according to claim 1 or 2, wherein the control means 8 is a level sensor. When the measured value of the stock level Aa at 6 reaches the set lower limit level, the rotation of the stock feed roll 2 is stopped, and the feeder gate opening / closing means 4 is operated to close the interval between the feeder gates 3 at the same time. The pulverizing roll 5 is separated.

  Further, the grain / seed / solid resin milling machine according to claim 5 is the grain / seed / solid resin milling machine according to claim 1 or 2, wherein the control means 8 is a level sensor. When the measured value of the stock level Aa at 6 rises from the set lower limit level, the stock feeder gate opening / closing means 4 is actuated to separate the feeder gate 3 and the stock feed roll 2 is rotated simultaneously. The interval between the grinding rolls 5 is returned to the grinding position.

  Further, the grain / seed / solid resin milling machine according to claim 6 is the grain / seed / solid resin milling machine according to claim 1 or 2, wherein the control means 8 is a level sensor. When the measured value of the stock level Aa at 6 fluctuates up and down between an upper limit value and a lower limit value set in advance, the rotation speed of the stock feed roll 2 set stepwise according to the stock level Aa is increased or decreased It is.

  Furthermore, the grain / seed / solid resin milling machine according to claim 7 is the grain / seed / solid resin milling machine according to claim 1 or 2, wherein the control means 8 is a stock feed. When the measured value of the stock level Aa by the level sensor 6 reaches the set upper limit level even though the roll 2 is flowing down the stock A at the maximum rotation speed, the feeder gate opening / closing means 4 is operated to feed the feeder The gate 3 is spaced apart to the maximum width to discharge the stock A and prevent the stock A from overflowing.

  Furthermore, the grain / seed / solid resin milling machine according to claim 8 is the grain / seed / solid resin milling machine according to claim 1 or 2, wherein the level sensor 6 has a temperature change. The air gun 6a is provided with a guarantee function and periodically removes a small amount of dust adhering to the level sensor 6.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings of an embodiment of a grain, seed, solid resin, etc. mill of the present invention. FIG. FIG. 2 is a schematic side view for explaining, and FIG. 2 is a cross-sectional view of an essential part for explaining an outline of an embodiment of a mill for grain, seeds, solid resin and the like according to the present invention.

  That is, the grain / seed / solid resin milling machine according to the present invention is symmetrically separated by a partition wall between two sets of grain / seed / solid resin milling machines as shown in FIG. Each body casing includes a stock hopper 1 provided with an inlet cylinder 1a on the upper side, a product discharge hopper on the lower side, and a stock feed roll 2, a feeder gate opening / closing means 4, which will be described later, The pulverizing roll 5 and the like are provided, and the following detailed description will be made only with a mill for a grain, seed, solid resin, etc. on one side.

  As shown in FIG. 2, the stock hopper 1 is disposed above a mill for cereals, seeds, solid resin, etc., and an inlet cylinder 1a is provided at the top, and stock A is stored in the inlet cylinder 1a. A supply system 1b such as piping supplied from a supply source in the upstream process is connected to receive and store the stock A, and a stock feed roll 2 and a feeder gate opening / closing means 4 which will be described later are provided in the upper part below. And an inclined plate 1c that is in contact with the stock feed roll 2 and the feeder gate opening / closing means 4 and is narrowed downward from above, so that all the stored powder or granules pass through the feeder gate 3. A transparent window through which the stock level Aa can be seen from the outside is provided on the side of the inlet tube 1a.

  Next, in the embodiment, the stock feed roll 2 has two rolls arranged in an obliquely downward direction at a lower opening of the stock hopper 1 and rotated in the same direction. The stock A is transported downward through a gap of a feeder gate 3 to be described later. Each stock feed roll 2 is mechanically connected to a variable speed stock feed roll geared motor 2a, and the stock feed roll geared motor 2a. Is provided with a speed controller 2b, which is driven by a signal sent from the control means 8 described later to the speed controller 2b.

  Next, the feeder gate opening / closing means 4 adjusts the flow of the stock A transferred by the stock feed roll 2, and the feeder gate opening / closing lever 4b pivotally attached by the pivot pin 4a is used as the feeder gate opening / closing actuator 4c. The feeder gate opening / closing lever 4b is pivoted by moving the feeder gate opening / closing actuator 4c forward and backward, and the distance between the feeder gate 3 and the feeder gate opening / closing lever 4b and the stock feed roll 2 is mechanically connected. Is to open, close and adjust.

  Further, the pair of pulverizing rolls 5 are horizontally arranged so as to be separable in the horizontal direction, that is, at least one of the pulverizing rolls 5 is mechanically connected to the pulverizing roll separating actuator 5a and moved in the horizontal direction so as to be separated. The crushing roll gap adjusting means 5b for adjusting the gap between the pair of crushing rolls 5 is provided, and the pair of crushing rolls 5 pass through the feeder gate 3 by rotating relatively in the middle direction. The stock A flowing down is pulverized.

  Furthermore, the level sensor 6 measures the stock level Aa of the stock A of the stock hopper 1 provided with the inlet cylinder 1a in a non-contact manner, and the stock feed roll 2 from the center of the top surface of the inlet cylinder 1a of the stock hopper 1. A mounting hole is drilled at a position apart in the axial direction, and a sensor head is mounted in the mounting hole to detect the distance to the inclined portion of the stock level Aa formed by the flow of the stock A Thus, it is connected to the control means 8 via an amplifier 7 which will be described later.

  Next, the control means 8 uses a sequencer and is connected to the level sensor 6 through an amplifier 7, and the signal of the measured value of the stock level Aa of the stock A at the level sensor 6 is sent to the amplifier 7. The signal is amplified and input.

  The control means 8 is electrically connected to the speed controller 2b of the mechanically connected stock feed roll geared motor 2a for rotating the stock feed roll 2, and is set stepwise in advance according to the detected stock level Aa. The rotational speed of the stock feed roll 2 is controlled by the rotational speed control program.

  Further, the control means 8 is electrically connected to a feeder gate opening / closing actuator 4c for pivoting a feeder gate opening / closing lever 4b of the feeder gate opening / closing means 4 provided for adjusting the interval of the feeder gate 3. The gate opening / closing actuator 4c is moved forward and backward to pivot the feeder gate opening / closing lever 4b, thereby opening / closing and adjusting the distance between the feeder gates 3 and adjusting the flow of the stock A flowing into the feeder gate 3.

  Further, the control means 8 controls separation of the pair of grinding rolls 5, and one of the pair of grinding rolls 5 is mechanically connected to the grinding roll separation actuator 5 a, and the grinding roll separation actuator 5 a is provided. Is electrically connected to the control means 8 and is moved by a signal transmitted from the level sensor 6.

  The level sensor 6 uses a reflection type ultrasonic level sensor. As is well known, the reflection type ultrasonic level sensor 6 emits an ultrasonic wave from the level sensor head and is reflected by the surface of the stock A. The ultrasonic wave is received, and the stock level Aa is accurately detected by the time difference.

  Next, the measured value of the stock level Aa in the level sensor 6 is amplified by the amplifier 7 and converted into a stepwise rotational speed control output signal by the control means 8 using a sequencer, and the converted output signal is stored in the stock feed roll. This is input to the speed controller 2b of the geared motor 2a for controlling the rotation of the stock feed roll 2 in accordance with the stock level Aa of the stock A.

  Next, when the measured value of the stock level Aa of the stock A by the level sensor 6 reaches the set lower limit level, that is, when it becomes impossible to supply the powder or granules A to the full width of the pair of grinding rolls 5. The control means 8 stops the rotation of the stock feed roll 2, operates the feeder gate opening / closing means 4 to close the interval between the feeder gates 3, and simultaneously separates the pair of grinding rolls 5.

  Further, when the measured value of the stock level Aa of the stock A by the level sensor 6 rises from the set lower limit level, that is, the powder or granules A can be supplied to the full width of the pair of grinding rolls 5. When the control means 8 operates the stock feeder gate opening / closing means 4 to separate the distance between the feeder gates 3, and the stock feed roll 2 is rotated, and at the same time the distance between the pair of grinding rolls 5 is returned to the grinding position. It is.

  Further, the control means 8 is set stepwise in advance when the measured value of the stock level Aa of the stock A at the level sensor 6 fluctuates up and down between the preset upper and lower limits of the stock level Aa. The rotational speed of the stock feed roll 2 is increased or decreased.

  Then, the control means 8 operates the feeder gate opening / closing means 4 when the measured value of the stock level Aa of the stock A by the level sensor 6 reaches the set upper limit level in spite of the maximum rotation operation of the stock feed roll 2. Thus, the gap between the feeder gates 3 is separated to the maximum width, the stock A is discharged, and the overflow of the stock A is prevented.

  Further, the level sensor 6 has a guarantee function against temperature change, and is provided with an air gun 6a that removes a minute amount of dust adhering to the level sensor 6 by periodically blowing air.

  The mill for cereals, seeds, solid resin, etc. according to the present invention is suitable for providing granular or coarse-grained cereals at a low price to a powder of a desired particle size corresponding to the stock level.

FIG. 1 is a schematic side view for explaining an outline of an embodiment of a mill for grain, seed, solid resin and the like according to the present invention. FIG. 2 is a cross-sectional view of an essential part for explaining the outline of the embodiment of the mill for grain, seed, solid resin and the like of the present invention.

Explanation of symbols

A stock Aa stock level 1 stock hopper 1a inlet cylinder 1b supply system 1c inclined plate 2 stock feed roll 2a geared motor for stock feed roll 2b speed controller 3 feeder gate 4 feeder gate opening / closing means 4a pivot pin 4b feeder gate opening / closing lever 4c Feeder gate opening and closing actuator 5 Crushing roll 5a Crushing roll separation actuator 6 Level sensor 6a Air gun 7 Amplifier 8 Control means

Claims (8)

  A stock hopper with an inlet cylinder for storing stock, which is powder or granules disposed above, a stock feed roll for transporting the stock of the stock hopper downward, and a flow of stock transported by the stock feed roll In a mill for cereals, seeds, solid resin, etc., comprising a feeder gate opening and closing means for opening and closing a feeder gate to be adjusted and a pair of grinding rolls for grinding the stock that has passed through the feeder gate. A level sensor that measures the stock level of the stock in a non-contact manner is attached to the top of the head, and the value measured by the level sensor is input to a control means provided with an amplifier, and rotation set in advance by the control means. According to the number control program, the rotation speed of the stock feed roll and the feeder gate opening / closing means Mill such as grains, seeds, solid resin, characterized in that the stock is to control the Rigo distance feeder gate and of the pair of grinding rolls to pass.   The level sensor uses a reflection type ultrasonic level sensor, and is mounted facing the stock in a mounting hole provided at a position shifted in the axial direction of the stock feed roll from the center of the ceiling plate of the inlet cylinder of the stock hopper, The mill for grain, seed, solid resin, etc. according to claim 1, wherein the stock level at one point of the portion where the accumulated stock flows out and tilts downward in the axial direction of the stock feed roll is measured.   The stock level is measured by the level sensor, the measured value is converted into a stepwise rotational speed control output signal by a control means via an amplifier, and the converted output signal is converted into a speed controller of a geared motor for stock feed rolls. The grain mill according to claim 1 or 2, wherein rotation of a stock feed roll is controlled according to the stock level.   The control means stops rotation of the stock feed roll when the measured value of the stock level at the level sensor reaches a set lower limit level, and simultaneously closes the feeder gate interval by operating the feeder gate opening / closing means. A pair of pulverizing rolls are separated from each other, and the mill for cereals, seeds, solid resin and the like according to claim 1 or 2.   When the measured value of the stock level at the level sensor rises from the set lower limit level, the control means operates the stock feeder gate opening / closing means to separate the feeder gate interval, and simultaneously rotates the stock feed roll, The mill for a grain, seed, solid resin or the like according to claim 1 or 2, wherein the interval between the pulverizing rolls is returned to the pulverizing position.   The control means increases or decreases the rotational speed of the stock feed roll set in advance according to the stock level when the measured value of the stock level by the level sensor fluctuates up and down between a preset upper limit value and lower limit value. A mill for grain, seed, solid resin, etc. according to claim 1 or claim 2, wherein   The control means operates the feeder gate opening / closing means when the stock level measured by the level sensor reaches the set upper limit level even though the stock feed roll is flowing down the stock at the maximum rotation speed. The mill for a grain, seed, solid resin, etc. according to claim 1 or 2, wherein the feeder gate is spaced apart to the maximum width to discharge the stock and prevent overflow of the stock.   The grain / seed according to claim 1 or 2, wherein the level sensor has a function of guaranteeing a change in temperature and an air gun for periodically removing a small amount of dust adhering to the level sensor.・ A mill for solid resin.

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