JPH0450899Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a device for adjusting the grinding gap formed between a pair of grinding rolls of a flour mill, and includes a The present invention relates to a device comprising first and second structural groups correspondingly arranged and means for visually observing the setting value of the grinding gap so as to adjust the grinding gap.

The invention relates to a mill roll frame of the type mentioned at the outset. In this case, three special operating conditions have to be taken into account with respect to the grinding gap adjustment device.

- If a relatively large foreign object, for example a screw, enters the grinding gap, the corresponding pressure shock must be relieved by immediately loosening the mechanical overload safety device for the roll pair.

- The grinding rolls must automatically go into offset positions away from each other when there is no grinding material, especially in the case of smooth rolls. This is because the different rotational speeds of the two grinding rolls immediately result in continuous wear of these grinding rolls.

- For normal grinding operation, the spacing of the grinding rolls must be adjustable with very high precision.

Experience has shown that mechanical grinding gap adjustment devices are conceivable, for example corresponding hydraulic adjustment devices.

[Conventional technology and problems to be solved]

European Patent Specification No. 13023 already filed by the applicant
As explained in sufficient detail in the above issue, the adjustment of the roll grinding gap for a mill roll frame is very simple, i.e. the adjustment process itself, but it is similar to operating the steering wheel in the case of a motor vehicle. It is a very complex process compared to until today,
It has not been possible to ascertain a grinding pressure or motor power consumption suitable for automatic adjustment of the grinding rolls or adjustment of the roll spacing with unique parameters of a type that corresponds to and satisfies the respective needs. Due to economic considerations, the influence parameters necessary and captureable for adjustment remain limited. Each automatic adjustment carries out the control and adjustment process without direct external visibility and usually excludes manual intervention. Failures can have completely different causes.
Even when equipment is operated optimally, humans are left with a small portion of equipment operation for all the unpredictable failure rates. Both automatic adjustment and manual intervention, if required, typically result in very expensive equipment.

The purpose of the present invention is to enable the gap between the grinding rolls to be adjusted both automatically and manually, and to provide a relatively inexpensive and simple structure for the gap between the pair of grinding rolls in a flour mill. An object of the present invention is to provide a grinding gap adjustment device.

[Means to solve the problem]

To achieve the above object, according to the invention, each of the first structural groups is pivotable to be rotated angularly to adjust the grinding gap and to move at least one of the two rolls. lever transmission adjustment means using a lever; and manual adjustment means for angularly rotating the lever; and the second structure group includes an electrical adjustment means for angularly rotating the lever. and power transmission means for transmitting the power of the electrical adjustment means to the lever and ensuring a precise positioning relationship between the electrical adjustment means and the lever transmission adjustment means; The electrical adjustment means have a remotely controllable drive motor and a sliding joint for transmitting the rotation of the drive motor to the power transmission means, the sliding joint providing a predetermined and preselectable rotation. The minimum rotational moment which can separate its positive connection by slipping when the torque is applied, and which no longer transmits the adjustment force of the drive motor beyond a certain rotational moment, and in addition that minimum rotational moment. The moment can be overcome by the hand wheel as a manual adjustment means, and the minimum rotational moment can be selected to be such that the grinding gap can be adjusted manually without rotating the drive motor together.

〔Example〕

Next, embodiments of the present invention will be explained with reference to the drawings.

I will refer to FIG. 1 from now on, but in FIG. 1, a lever transmission adjustment means 8 using an adjustment arm 9 and a manual adjustment means 16 are recognized as a first structure group 1, and a second structure group 1 is recognized as a lever transmission adjustment means 8 using an adjustment arm 9 and a manual adjustment means 16. As, electric regulating means 19,2
0 and the power transmission means 18 are recognized.

Two crushing rolls 41 and 42 share a common carrier 3
is supported by A movable roll 42 is swingably attached to a fixed eccentric bolt 4 , the engagement and disengagement being controlled by a corresponding lever 5 and an engagement cylinder 6 . By swinging the lever 5, the eccentric bolt 4 is rotated and the lower part of the swingable bearing housing 7 is moved horizontally, so that the spacing between the two grinding rolls can be roughly adjusted. This device alone is too imprecise to accurately adjust the grinding rolls. This device is then utilized simply to place the grinding rolls in the engaged or disengaged position, or in two fixed positions.

The actual fine adjustment of the grinding rolls 41 and 42 takes place via an adjusting spindle 8 as lever transmission means, which by rotation directly moves an adjusting arm 9 around a fixed rotary bearing 10. The short upper end of the adjusting arm 9 is connected via a tension rod 11 to the pivotable bearing housing 7 in a frictional connection. The transmission of force takes place via a blade that is part of the overload spring protector 12, which on one side is adapted to allow the spring to deflect in the event of an overload. On the opposite side there is an adjustable counter-holding stud 1 on the tension rod 11.
3, as well as a pressure measuring device 14 with a pressure display device 15. Because the grinding rolls can be adjusted in parallel during service operation, corrections can be carried out on each required side via the adjusting screws 43, 44. The adjusting spindle 8 is held stationary by a bearing 10 and is controlled via a handle wheel 16 which has a display clock 17 (FIG. 2) integrated directly as a means for visually observing the set value of the grinding gap. , or via a transmission chain 18 and a reduction motor or drive motor 19 as power transmission means.
The drive motor 19 is fixed to the roll frame 26 and is in direct connection with the transmission chain 18 or the adjusting spindle 8 via a sliding joint 20 and a chain wheel 21 . The drive motor 19 and the sliding joint 20 constitute electrical adjustment means.

It goes without saying that the adjusting motor 19 and the sliding joint 20 can be fixed in their respective other positions, for example externally on the rolling mill. The free inner space of the strut legs appears to be the best place to place the electrical adjustment means. The sliding joint 20 is, in any case, a joint which transmits a minimum rotational moment and which, at a certain preselectable rotational moment, releases the positive connection by slipping or increases the adjustment force of the drive motor in excess of a certain rotational moment. It is a joint that no longer transmits information. However, the minimum rotational moment must be selected to be so large that it can be overcome by the handle wheel and that the grinding gap adjustment can be carried out manually without rotating the drive motor together.

Furthermore, directly the transmission chain 18 and the position indicator 2
2 are directly connected via the chain 23 and the chain wheel 24, each movement of the transmission chain 18 is recorded on the position indicator 22 and further manipulated into the desired position. As can be deduced from FIGS. 1 and 2, very few elements are required for the electrical adjustment means, and the drive motor 19 with the joint 20 being the largest element is particularly advantageously mounted on a roll frame stand. 26 so that the second structure group 2,
That is, electrical adjustment means for automatic grinding gap adjustment can be incorporated later. Grinding plant roll frames are typically constructed in a double construction, which is indicated by centerline 27 in FIG. Each roll body of the two roll frame halves may or may not be provided with automatic adjustment means.

FIG. 2 shows a first example of design change. One structure group 1 or 2 is arranged on each bearing end side. In that case, one possibility is that each steering wheel 1 has a display clock 17 on both sides as well.
6 is shown. Both bearing sides each have a drive motor 19, a position indicator 22, and a transmission chain 18. At the same time, the roll spacing on both bearing sides can be controlled via electrical adjustment means 18 , 19 or adjusted via the steering wheel 16 . In place of the display clock 17, a digital display 45 and input pushbuttons 46 can also be used. Additionally, the steering wheel 16 and input pushbutton 4 have been used for some years to acclimatize the operator.
It is also possible to provide it at the same time as 5.

Figure 3 shows a very simple design. In that case, only the steering wheel 16 and the display clock 17 are provided on the left and right or in duplicate for individual correction. In addition, in the case of further simplification, instead of the steering wheel 16 and the display clock 17, a corresponding adjustment can be carried out in the direction of service adjustment via the nuts 43, 44 (FIG. 1), so that in that case, for example, the product For very rare changes in mixing, or for relatively large mills with always the same final product, the display clock 1
Only a steering wheel 16 with 7 is required. The grinding gap is adjusted via the drive motor 19,
The adjustment stroke is then transmitted via chains 39 and 40 to the other bearing side. Parallel adjustment of the grinding rolls is thus carried out via corresponding automatic tuning means. As in other areas, separate automation customary steps have to be carried out for the mill roll frame in practice. To this end, the novel invention makes a very valuable contribution. In FIG. 1, only the drive belt 28 for driving the grinding rolls 41 and 42 is shown. A measuring and displaying device 29 for the required electrical output can also be provided in the drive system. It is thus possible, for example, to limit the electrical power consumption to lower and upper values and to shift the grinding rolls away from each other, for example, when a preselected range is exceeded.

A further development concept is that the effective spacing of the bearing housing parts is determined via a roll spacing measurement and display device 30 (FIG. 1). Particularly when using raised rollers, the roll spacing monitoring device makes it possible in a simple manner to prevent erroneous commands leading to mechanical destruction of at least parts of the rolling mill.

FIG. 4 once again shows a schematically identical device, with additional control connections added.

Mechanical calculator 3 for all signals of the roll frame
A central computer 32 with a storage 33 can receive the required reference values from the mechanical calculator 31 . The position indicator 22 is the third
In the figure, a position limit value switch 34 is provided which can be adjusted to a preselectable limit value, thus preventing automatic erroneous adjustment. The position limit value switch 34 in the illustrated position has the advantage of preventing erroneous manual adjustment. This is because the steering wheel causes a corresponding stroke movement of the transmission chain 18 and chain 23 in a self-adjusting manner. The position indicator 22 is the digital indicator 4
5 and the input pushbuttons 46, an input information device 35, which receives or transmits corresponding signals of the mechanical calculator 31, can be connected very precisely, such as the drive motor 19. With the same intention, pressure measurement and display devices 14, 15
can be connected to the mechanical calculator 31. Depending on the construction of the rolling mill, one or more safety devices can be provided on the same rolling mill. For example, when incorporating ridged rolls, monitoring the grinding pressure is of little value, but monitoring the spacing of the grinding rolls, whether by the position indicator 22 or by the distance measuring device 36, is useful. Deaf also has the opposite meaning. The opposite is true for smooth rolls where pressure monitoring provides many benefits. The calculator 37 and the directed signal conductor 38 allow the computer 32 or the storage device 33 to control an integral number of roll frames, or possibly all roll frames, in the mill and, if necessary, also provide adjustment functions. Must suggest integration.

[Effect of idea]

The invention comprises a first structural group comprising a lever transmission adjustment means with a pivotable adjustment arm, an adjustment handle, an electric adjustment means consisting of a drive motor and a sliding joint, and a lever transmission adjustment means such as a transmission chain. By separating the drive motor into a second structural group with a power transmission means and a drive motor with a sliding joint as an electrical adjustment means, a very small component can be placed in the empty recess below the roll stand. Therefore, it can be easily integrated later as a second structural group into a conventional flour mill roll frame having only manual adjustment means such as a steering wheel.

Conventionally, in order to be able to switch between automatic and manual mode, a very complicated mechanism was required, and additional operations were required when switching to manual mode, but in this invention, the sliding joint and the steering wheel are connected. The combination makes it possible to adjust the grinding roll gap by manually operating the adjusting spindle whenever necessary, without any need for manual switching operations, and without having to rotate the drive motor together. , this allows the use of inexpensive drive motors.

[Brief explanation of the drawing]

Fig. 1 shows a grinding gap adjustment device for a flour mill rolling mill having an electric adjustment means consisting of a drive motor and a sliding joint; Fig. 2 shows an electric adjustment means and a manual adjustment means on both sides; FIG. 3 shows a variant of FIG. 2, but with manual adjustment means on both sides and a single motor drive for parallel adjustment of the grinding rolls. , FIG. 4 schematically shows motor adjustment means, such as computer means. 9... Adjustment arm, 8... Lever transmission adjustment means, 16... Manual adjustment means, 18... Power transmission means, 19... Drive motor, 20... Slip joint,
41, 42...Crushing roll.

Claims (1)

[Scope of utility model registration request] A device for adjusting a crushing gap formed between a pair of crushing rolls of a flour mill, the device comprising first and second structural groups arranged to correspond to each end portion of the rolls; and means for visually observing a grinding gap setpoint to adjust the gap, wherein each of said first structure groups is angularly rotated to adjust said grinding gap. and lever transmission adjustment means 8 with a pivotable adjustment arm 9 for moving at least one of said two rolls, and manual adjustment means 16 for angularly rotating said adjustment arm; A second structure group includes an electrical adjustment means for angularly rotating the adjustment arm 9, a power transmission of the electrical adjustment means to the adjustment arm 9, and a transmission between the electrical adjustment means and the lever. power transmission means 18 for ensuring a precise positioning relationship between the adjustment means, said electrical adjustment means having a remotely controllable drive motor 19 and a rotation of said drive motor connected to said power transmission means. a sliding joint 20 for transmitting the minimum rotational moment at which the sliding joint can separate its positive connection by sliding at a predetermined, preselectable rotational moment; It is possible to transmit a minimum rotational moment which no longer transmits an adjustment force of the drive motor that exceeds the rotational moment, and which, moreover, is overcome by the handwheel 16 as a manual adjustment means and which also causes the drive motor 19 to A device characterized in that the size is selected such that the grinding gap can be adjusted manually without rotation.