JPH02258073A - Roll gap control apparatus of grinder - Google Patents

Abstract

PURPOSE:To control rolls so as to set a certain roll gap without gaining experience by comparing the output signal of a roll position detection part with a preset roll gap value and outputting the difference between them as a drive signal to operate a roll gap control part. CONSTITUTION:A pair of rolls 62, 63 are provided so as to be freely opposed to each other add one roll is moved far and near with respect to the other roll to control a grinding degree. The position of the roll 63 to that of the roll 62 is detected by a roll position detection part 100 and, in a control part, the output signal of the position detection part 100 is compared with a preset roll gap value and the difference with said roll gap value is outputted as a drive signal. A roll gap control part 101 is operated by the drive signal of the control part. As a result, anyone can control a certain roll gap without relying on experiential perception.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a crusher used for milling wheat or the like, and particularly to a roll gap device for a roll crusher.

[Prior art and its problems]

In the milling process of making flour from wheat, the crushed wheat, etc. (the raw material to be crushed) is fed to a roll crusher and crushed, but instead of being crushed into powder all at once, several roll crushers are used in series. These are then functionally combined using various sorting devices and conveying devices to obtain crushed products such as wheat flour (products crushed to the required degree of fineness). These flour milling factories have installed around 200 crushers with a capacity of 200 tons per 7 days, but as mentioned above, several roll crushers are lined up in series and the gap between the rolls of each crusher is adjusted. . Adjustment of the gap between the rolls needs to be adjusted each time depending on the type of roll, the type of raw material, the quality of the product, etc. Moreover, manual adjustment requires experience. For example, the noise generated by the crusher during crushing, the visual confirmation of the crushed particles, etc. Needless to say, a great deal of time was spent adjusting the gap between the rolls of each roll crusher.

In order to solve the conventional problems, the present invention provides a roll gap adjustment device for a crusher that can maintain a constant roll gap without relying on experience and can be adjusted by anyone without experience. With the goal.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a pulverizer in which a pair of rolls are provided so as to freely face each other and the other roll is moved far and near relative to one roll to adjust the degree of pulverization. a roll position detection unit that detects the position of the other roll relative to the position of the other roll, and a control unit that compares the output signal of the position detection unit with a previously set roll gap value and outputs the difference with the roll gap value as a drive signal. A non-contact displacement sensor is used as the roll position detection section, and a stepping motor is used to drive the roll gap adjustment section. to use,
Alternatively, communicating the load current value of the motor of the roll gap adjustment section to the control section and determining the origin of the roll gap based on the load current is highly effective as a means for solving the above problem.

[For production]

The origin is when the gap between the pair of rolls of the roll crusher is set to zero, and the position of the other roll at this time is set to zero, and a roll position detection section is provided in relation to the other roll to output the roll gap as an electrical signal. In other words, the position of the other roll is defined as the amount of displacement from the origin, and the roll position detection section communicates this amount of displacement to the control section as the roll gap. The control unit that receives the signal from the roll position detection unit compares the displacement amount with a preset roll gap value, and communicates the difference as an electric signal to the roll gap adjustment unit, and the roll plate gap adjustment unit The roll gap is changed by moving one roll closer to the other roll.

Here, if a non-contact displacement sensor is used in the roll position detection section, it is possible to output a voltage of displacement of 1/lHOII1m, which greatly contributes to roll gap adjustment that requires managing displacement in μm units. This is Shiuruchino.

Further, the roll position detection section can also be configured only with the above-mentioned sensor.

Further, the roll gap adjustment section generally adjusts the roll gap by transmitting the amount of eccentricity of the cam by manual rotation of the eccentric cam to the other roll, but when the rotation of the eccentric cam is performed by a stepping motor, Although it differs depending on the structure of the mechanism for transmitting the amount of eccentricity, controlling the stepping motor at 1/b for 10 steps becomes easy. It goes without saying that the effect is great when a non-contact displacement sensor is provided in the roll position detection section and a stepping motor is provided in the roll gap adjustment section at the same time.

Further, when adjusting the roll gap by driving the motor, the motor is driven at the beginning of operation to reduce the roll gap in order to detect the origin of the roll gap, that is, when the roll gap is zero. During this time, the motor load current value is communicated to the control unit. When the roll gap becomes zero, that is, when the rolls touch each other, the motor load current increases rapidly.The control unit detects this increase in load current, determines the zero roll gap origin, and uses this origin as a reference for rolling. This is to adjust the gap.

〔Effect of the invention〕

According to the present invention, if the origin of the roll gap (state where the roll gap is zero) is determined and memorized based on the motor load current of the roll gap adjustment device of the crusher, the crusher can Even an inexperienced person can adjust the roll gap. Furthermore, the present invention makes it possible to adjust the gap to the same size each time, which is difficult even for experienced users.

In other words, for roll gaps that need to be changed each time depending on various conditions such as product type and product conditions, the roll gap value can be selected by storing several types of roll gaps to be set in the control section. By simply doing this, you can always maintain the same roll gap regardless of whether you are an experienced user or an inexperienced user.

Furthermore, the values stored in the control section have not been able to be displayed numerically by factory operators until now, and the experience values of experienced personnel can be stored numerically and compiled into a database.

Furthermore, if the control section of the roll gap adjustment device is connected to the central control room, each machine can be adjusted from the central control room.

〔Example〕

First, FIG. 1 shows an example of the process of milling common wheat flour.

Here, there are four crushers (flour mills) 1゜2, 3. 4 and 3 sieve sorters5. 6. 7 is the main constituent machine.

The first pulverizer 1 communicates with a cyclone 8 by pneumatic transportation, and the cyclone 8 is provided with an air lock valve 9 at its lower part and uses a valve with a switching valve '10 to determine the degree of pulverization of some of the pulverized particles. The liquid is communicated to the measuring unit 11 to be appropriately supplied, and further communicated to the supply port of the first sieve sorter 5. In this embodiment, the sieve sorter 5 is capable of sorting and separating into three stages depending on particle size, and has a large particle discharge port 12. Medium particle outlet 13. It has a small particle outlet 14 , a large particle outlet 12 to the supply port of the pulverizer 1 , a medium particle outlet 13 to the supply port of the second pulverizer, and a small particle outlet 14 to the cyclone 15 . Please contact each.

Further, the second crusher 2 is connected to a cyclone 15 by pneumatic transport, and the cyclone 15 is provided with an air lock valve 16 at its lower part, and uses a valve 17 with a switching valve to determine the degree of crushing of some of the crushed particles. The liquid is communicated to the measuring unit 18 to be appropriately supplied, and further communicated to the supply port of the second sieve sorting machine 6. The sieve sorter 6 can sort and separate particles into three stages depending on particle size, and has a large particle discharge port 19. It has a medium particle discharge port 20 and a small particle discharge port 21, the large particle discharge port 19 is connected to the supply port of the second crusher 2, the medium particle discharge port 20 is connected to the supply port of the third crusher 3,
The small particle outlets 21 each communicate with a cyclone 22 .

Next, the third crusher 3 communicates with the cyclone 23 by pneumatic transport, and the cyclone 23 is provided with an air lock valve 24 at its lower part, and uses a valve 25 with a switching valve to adjust the degree of crushing of some of the crushed particles. It communicates to the measuring unit 26 that discriminates so as to supply it appropriately, and further communicates it to the supply port of the third sieve sorter 7. The sieve sorter 7 can sort and separate particles into three stages depending on particle size, and has a large particle discharge port 27. It has a medium particle discharge port 28 and a small particle discharge port 29, the large particle discharge port 27 is connected to the supply port of the fourth crusher 4, the medium particle discharge port 28 is connected to the cyclone 30, and the small particle discharge port 29 is connected to the cyclone 31. Please contact each of them. The fourth crusher communicates with the Sincron 23 by pneumatic transportation.

The exhaust air from cyclone 8.15.24 is connected to cyclone 33 via blower 32, and then to cyclone 22.31.3.
The exhaust air from cyclone 33.
It is then released to the outside. Cyclone 22.30.31,
33.35 both have air lock valve 37 at the bottom.
．． 38, 39, 40, 41 are provided and connected to the supply port of the powder receiving tank 42, 43, 44 for storing crushed material. The above is the general milling process for wheat, etc.

Next, the crushers 1 to 4 of this process example will be briefly explained based on FIG. 2. The pulverizer shown in FIG. 2 has a pair of rolls 62 and 63 installed in a pulverizing chamber so as to be able to freely rotate in opposition to each other. a regulating device and a third
This will be explained in the figure. Reference numeral 71 is a supply hopper provided at the top of the crusher, 72 is a delivery roll provided at the outlet of the hopper 71, and 73 is a control valve. Further, the lower part of the crushing chamber is a discharge gutter 74 for transporting air, and 75 is a main motor that rotationally drives a pair of rolls.

Next, an embodiment of a roll gap adjusting device for a crusher according to the present invention will be described with reference to FIGS. 3 and 4.

A bearing 69 that pivotally supports the rotating shaft 68 of the roll 63 is mounted on a fulcrum shaft 70 fixed to the machine frame, and is rotatable about the supporting shaft 70, so that the roll 63 can be adjusted in distance relative to the roll 62. becomes.

On the other hand, an adjustment rod 81 that is threaded and screwed onto the bearing unit 80 is loosely fitted into a protrusion 85 located symmetrically to the bearing part mounted on the length rotation shaft 70, and a receiving blade 82 is attached to one side of the rod. The adjusting rod 81 is clamped to the protrusion 85 by the elastic body 83, the nut 84, and the other nut 84. Also arm 88
One end of the shaft 90 is rotatably mounted on the machine frame, and an eccentric cam 89 is fitted to the other end of the shaft 90, which is fitted into the bearing unit 80. Furthermore, arm 8
A shaft 66 into which a rotating shaft 67 of a stepping motor 65 is screwed is fitted to the other end of the stepping motor 6.
5 is rotatably mounted on a shaft 60 fixed to the machine frame.

Axis 60 with diagonal lines added in FIG. Of the 70°90, the shaft 60.70 has one end fixed to the machine frame (not shown), and the shaft 90 has one end fixed to the machine frame (not shown).
0 is fitted at one end and is rotatable.

Next, reference numeral 86 is a non-contact displacement sensor (hereinafter referred to as "sensor") which is held by a support member 87 provided on the machine frame.
The sensor 86 is in contact with a position detection protrusion surface 91 provided on the circumference of the bearing 69. In this embodiment, the sensor 86 is an eddy current displacement sensor. However, it goes without saying that the sensor is not limited to this embodiment and there are various other sensors.

Further, in this embodiment, the roll position detection section 100 is a non-contact displacement sensor 86, and the roll gap adjustment section 101 refers to a series of mechanisms including the stepping motor 65 and up to the fulcrum shaft 70. The stepping motors 65 are each in communication with the control section 102. Note that the roll position detection section 100 and the roll gap adjustment section 101 are provided on both measuring section frames of the roll 63, respectively. The control unit 102 includes a memory circuit 103 for setting and storing the roll gap value and a comparison circuit 10 for comparing the output signal of the sensor 86 and the set value of the memory circuit 103.
4 and a drive circuit 105 that drives the stepping motor 65 based on the difference determined by the comparison circuit 104.

(FIG. 4) The roll gap adjustment device 64 is formed by the above-mentioned control section 102, roll position detection section 100, and roll gap adjustment section 101.
Configure.

Next, the operation of this embodiment will be explained. First, initial settings (zero point)
When the nut 84 is tightened with the rolls 62 and 63 in contact with each other, the elasticity of the elastic body 83 brings the rolls 62 and 63 into pressure contact. At this time, the sensor 86 is
It is supported by a support member 87 in a state where it is in contact with the protrusion surface 91 of No. 9 .

With the above, the initial setting is completed and the zero point of the roll position is generated. Although the sensor 86 is in contact with the protrusion surface 91 here, an arbitrary gap may be provided between the sensor 86 and the protrusion surface 91 in order to prevent damage due to mechanical pressure. Next, when the main motor 75 rotates and the rolls 62 and 63 begin to rotate, the sensor 86 outputs a signal of displacement O to the control unit 102. A difference occurs in the comparison circuit 104 when compared with the set value in the storage circuit 103, and the drive circuit 105 outputs a signal to the stepping motor 65, causing the rotating shaft 67 to rotate. With the rotation of the rotating shaft 67, the shaft 66 begins to move to the right (or left), and the arm 88 swings to the right (or left), and due to the rotation of the shaft 90 to which the arm 88 is fixed, the eccentric cam 89 moves to the right (or left).
or left). As the bearing unit 80 moves rightward (or leftward) by the rotation of the eccentric cam 89, the bearing 69 rotates rightward (or leftward) about the fulcrum shaft 70, and the roll gap between the rolls 62 and 63 is reduced. It will gradually open (close). When the bearing 69 rotates in the right direction from its initial state, the gap between the sensor 86 and the protrusion surface 91 gradually widens, so the sensor 86 uses this displacement as the comparison circuit 1.
94.

By repeating the above steps, the roll gap between the rolls 62 and 63 is controlled so as to approach the set value in the memory circuit 103.

By the way, when using a normal motor or a motor equipped with a speed reduction device to drive the roll gap adjustment device 64, the rated load current value of the motor is set in advance to 106.
is stored in the control unit, and when the crusher is started, the motor is driven to gradually reduce the roll gap while the control unit monitors the motor load current value 107. The gap becomes zero and the rolls touch, causing a sudden increase in the motor load current 107 of the roll gap adjustment device. Since the control unit 102 monitors the current value 107 based on the rated load current value 106 of the motor stored in advance, a difference occurs between the current value 107 and the rated load current value 106 stored in advance. If the time at which this difference occurs is set as the origin position where the roll gap becomes zero, there is no need to manually determine the origin of the roll gap, and there is no need to rely on the operator's experience.

It should be noted that a plurality of setting values are stored in the control unit 102, and a switch corresponding to each setting value or a keyboard with numerical symbols corresponding to the setting value is connected to the main unit or the control unit 1.
02, or provide the control unit 102 with a communication function and communicate with the central control to control all the crushers, and communicate with a crush degree measuring device to adjust the roll gap. can be easily considered.

Also, when considering the temperature rise of the rolls during operation of the crusher, the temperature rise is 20℃, and the diameter of the rolls is 300℃.
mm Assuming the outside temperature is 20℃, simply considering the coefficient of linear expansion, 300X (20+20) X11.8XlO-' → 0
．． 1411, 8 X 1G-6: Linear expansion coefficient of iron,
Since the expansion is 140 μm, the influence on the gap between the rolls of the crusher is significant.

Therefore, as shown in FIG. 3, for example, a temperature sensor 110 for measuring the temperature rise of the rolls is provided at an arbitrary position, and communicated with the control section described above, in response to a drive signal to the stepping motor of the roll gap adjustment device. It is also conceivable to add temperature correction according to the temperature of the temperature sensor.

It is also conceivable to measure the temperature by passing cooling water through or near the temperature rising part and measuring the temperature of this cooling water, thereby using a temperature sensor.

As described above, according to the present invention, when the roll gap value of the crusher determined empirically or experimentally is input into the control device, the control unit, the roll position detection unit, and the roll gap adjustment unit adjust the roll gap to the set value. is automatically set to . As a result, even an inexperienced or inexperienced operator of a roll crusher can maintain a constant roll gap that is consistent with the raw material type and product quality. can be adjusted quickly.

[Brief explanation of drawings]

Fig. 1 is a flow diagram of the flour milling process according to the present invention, Fig. 2 is a partially cutaway front view of the crusher, Fig. 3 is an embodiment of the roll gap adjustment device, and Fig. 4 is the roll gap adjustment device. FIG. 3 is a control circuit diagram of a control section of the controller. 1...Crusher, 2...Crusher, 3...Crusher, 4
... crusher, 5... sieve sorter, 6... sieve sorter,
7... Sieve sorter, 8... Cyclone, 9... Air lock valve, 10... Valve, 11... Measuring section, 12... Large particle discharge port, 13... Medium particle outlet, 14...Small particle outlet, 15...Cyclone, 1
6...Air lock valve, 17...Valve, 1
8... Measuring section, 19... Large particle outlet, 20...
Medium particle discharge port, 21... Small particle discharge port, 22... Cyclone, 23... Cyclone, 24... Air lock valve, 25... Valve, 26... Measuring section,
27...Large particle outlet, 28...Medium particle outlet, 2
9...Small particle outlet, 30...Cyclone, 32.
...Blower, 33...Cyclone, 34...Blower, 35...Cyclone, 36...Bag filter, 37...Air number lock valve, 38...Air...
Lock valve, 38... Air lock valve, 3
9... Air lock valve, 40... Air lock valve 41... Air lock valve, 42...
・Tank, 43...tank, 44...tank, 45
... Solenoid, 46 ... Supply cylinder, 62 ... Roll, 63 ... Roll, 64 ... Roll gap adjustment device, 65 ... Stepping motor, 66 ... Shaft, 6
7... Rotating shaft, 68... Shaft, 69... Bearing, 70
...Spin shaft, 71... Supply hopper, 72... Feeding roll, 73... Control valve, 74... Discharge gutter, 75...
...Main electric motor, 80...Bearing unit, 81...Rod, 82...Blade receiver, 83...Elastic body, 84...
Nut, 85...Protrusion, 86...Non-contact displacement sensor (sensor), 87...Support, 88...Arm, 89...Eccentric cam, 90...Shaft, 91...・・・
Position detection protrusion surface (protrusion surface), 100... Roll position detection section, 101... Roll gap adjustment section, 102...
Control unit, 103... Memory circuit, 104... Comparison circuit, 105... Drive circuit, 106... Rated load current value, 107... Load current value, 110... Temperature sensor

Claims (4)

[Claims] (1) In a pulverizer in which a pair of rolls are freely opposed to each other and the degree of pulverization is adjusted by moving the other roll near or far from one roll, the position of the other roll relative to the other roll is detected. A roll position detection section, a control section that compares an output signal of the position detection section with a preset roll gap value, and outputs the difference with the roll gap value as a drive signal, and the drive signal of the control section. 1. A roll gap adjustment device for a pulverizer, comprising: an actuated roll gap adjustment section. (2) The roll gap adjustment device for a crusher according to claim (1), wherein a non-contact displacement sensor is used in the roll position detection section. (3) The roll gap adjustment device for a crusher according to claim 1 or 2, wherein the roll gap adjustment section is driven by a stepping motor. (4) The crusher according to claim 1 or 2, wherein the load current value of the motor of the roll gap adjustment unit is communicated to the control unit, and the zero origin of the roll gap is determined by the increase in the load current. Roll gap adjustment device.