JPS6142344A - Milling gap controller for roll frame of mill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

The present invention relates to a grinding gap adjustment device for a mill roll frame with adjustment elements and means for automatic adjustment of the grinding rolls, the grinding rolls having a mechanical pressure overload safety device. The present invention refers to a type of flour mill roll frame. In this case, three special operating conditions must be taken into account regarding 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. If they are different, the different rotational speeds of the two grinding rolls will immediately cause them to wear out in succession. - 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. Already in sufficient detail in the applicant's European Patent Specification No. 13023 1. <As mentioned above, when adjusting the grinding gap using a mill roll frame, the adjustment process itself is very simple, but it is a very complex process that can be compared to the steering wheel guidance of a car. It is. To date, it has not been possible to ascertain the grinding pressure or motor power consumption suitable for the automatic adjustment of the grinding rolls or the adjustment of the roll spacing with unambiguous parameters of the type that correspond to and satisfy the respective needs due to economic considerations. Because of this, the influence parameters necessary for adjustment and that can be captured remain limited. Each automatic adjustment carries out the control and adjustment process without direct visibility from the outside.1
2, and usually excludes manual interference. Failures can have completely different causes. If the equipment is operated optimally, however, humans are left with only h portions of equipment operation for all unpredictable failure rates. Both automatic adjustment and manual intervention, if necessary, usually result in very expensive equipment. The main object of the invention is to find a simple, reliable and effective solution for automatic grinding clearance adjustment of individual or groups of mill roll frames. The solution according to the invention is characterized in that the controllable drive motor can be connected to the adjustment member by a transmission means. Although the solution idea is very simple, surprisingly, the method of operation was already reliable in the first experimental roll frame. According to the invention, the motor adjustment means are connected only in the original sense and correspond to the conventional performance. Therefore, it is not compulsorily integrated into all regulators. However, this
A complete series of advantages results, in particular, if the transmission means has an actual joint and a position indicator on the drive side of the joint. In particular, the motor adjustment means can also be added later, for example by mounting via a joint, which is helpful with respect to all existing mill roll frames and also maintains even greater economic value and further automation. Because it can be equipped for automation. Some do not have to compulsorily configure new equipment as is common in other industrial sectors. It has proven to be particularly advantageous if the joint is designed as a particularly advantageously adjustable safety joint. Automatic control of the grinding gap adjuster according to predetermined standard values, for example for the spacing of the grinding rolls, has thus become possible in a very sophisticated manner. The adjustment is carried out according to a predetermined program or reference plan, which requires precise and very robust "guidance" for railway rails. It is thus possible to prevent, for example, the grinding gap or the pressure from being set to abnormally high values and destroying the rolling mill or the roll bearing.A further particularly advantageous development The idea is that the adjusting force is transmitted by a slip-free transmission, for example a toothed belt or a chain, and can be indicated by a position indicator, particularly preferably a potentiometer coupled to the slip-free transmission. According to the position indicator, it is possible to determine the exact position of both grinding rolls at each moment, especially if the position indicator is on the drive side of the safety joint and thus has a direct forced connection with the adjusting element. For actual work, the position indicator can be used to adjust the grinding rolls via the drive motor by the reliable upper mill with digital display and input push. It has been found to be very useful when the button is in the range of the roll frame. By directly driving the adjustment spindle and simultaneously fixing the handle wheel on the M adjustment spindle, the grinding gap is independent. A good solution for operation is obtained by being able to adjust manually or automatically.Adjustment vehicles can also have a display device for the person only position.This can be used as a dial gauge directly on the steering wheel. It can be integrated into the car. In this way, for each automatic correction, the steering wheel is operated together and the respective status is displayed on the steering wheel. Only the digital display or the display It is self-evident that the device alone or but both at the same time can be used. The digital display can be used to adjust the grinding rolls in parallel, in which case the same adjustment path is carried out on both bearing sides. Due to the simultaneous adjustment, only one drive and a corresponding connection to the reference value setting device are required for this purpose.On the other hand, with a steering wheel, the manual Corrections can be made. In an extension of the invention, the position indicator can have a position limit value transmitter for limiting the adjustment path, so that additionally an electrical safety device can be incorporated in the entire device. Excessive grinding pressure can be prevented on both grinding rolls by correspondingly electrically switching the switch element.
Alternatively, it is possible to prevent both rolls from coming close to each other. Particularly in the case of ridged rolls, the latter measure also serves to protect the ridges from instant destruction upon roll contact. In the case of smooth rolls, the position limit switch serves both the roll and the roll bearing. In addition to what has been said above, a particularly advantageous use of the calculator means can be easily demonstrated in that the motor adjustment means can be controlled by a computer or by a corresponding reference value scheme, in which case some rolling frames A common computer and standard value storage device are attached. The prerequisite for this solution variant is the direct control of all roll frames according to a predetermined reference value plan, and therefore the original control process. Obviously, in addition to the control process, the grinding gap adjusting device can also be part of the actual adjusting device, in which case the grinding result or the fineness of the resulting particles should be adjusted depending on the width of the grinding gap. The size is selected and controlled accordingly to the grinding gap. It is advantageous to provide an input pushbutton and a position indicator, for example of digital type, in the region of the roll frame in addition to the motor adjustment means. In an extension of the idea of the invention, the grinding roll pair can be equipped with grinding pressure, measuring and display devices as well as pressure limit value switches. It is therefore possible to optionally use a pressure limit switch or, as previously explained, a position limit switch for overload protection caused by inaccurate control commands for adjusting the grinding gap. can. Another protection possibility is to equip the grinding roll pair with a required power measurement and display device of an electrical power reservoir and a power consumption limit value switch, or, however, to equip the roll pair with a roll distance measurement and display device and a distance limit switch. The purpose is to attach a value switch. In each design variant, it is proposed, in an extension of the idea of the invention, that a limit value switch (pressure car power consumption-interval) can be effectively arranged simultaneously on the motor regulator and on the manual regulator, with the protective element obsolete. Conventional ideas for automatically operable flour mill roll frames proceed from the fact that automatic tuning means must have priority over devices for manual operation also due to the constructional arrangement. There is. For this reason, in the previously known solution, a corresponding reduction motor was connected directly to the tension member for the adjustment of the grinding rolls (European Patent Specification No. 1.
No. 8028, Figure 6). The now novel invention has shown that this was the reason why no corresponding solution was reached in practice. The invention proposes to leave the traditional adjustment means together as one structural group. If one puts up with even a superficial degree of complexity, the new path soon proves to be very expedient and to have surprising practical benefits. The adjusting element has a lever-transmitted adjusting element in the region of the grinding roll as a first structural group, and a controllable drive motor as a second structural group, which has a spacing relative to the adjusting element. It is very particularly advantageous if the adjustment element can be connected to the adjustment element via a particularly advantageous fx-transmission element of the slip. The guiding idea of the new solution path is that, in particular, if the traditional manual adjustment is supplemented by automatic tuning means, in addition to new types of comminution, for example, the rolls can be made “more flexible” or “harder”. On the contrary, it is necessary to maintain the existing stability of the adjustment of the grinding rolls, which is solved quite particularly well according to the invention with two construction groups.However, Many further benefits are derived therefrom: automatic tuning means can be added to the rolling mill at any time later, for example if only part of the roll frame of the mill has to contain the automatic tuning means. It is only an addition.Since the mill roll frame for the type of work (processing of powdered materials) is already a very compact machine so far, the second structure group can be spaced apart from the roll pair. The arrangement does not interfere with the accessibility of the remaining elements. The roll frame can always be operated without automatic tuning means, if necessary. It is especially advantageous if the adjustment parts have a ratio greater than 1:2. It is very useful to have levers with a ratio greater than 1:8, in which case the drive motor is engaged via a relatively long lever part and the adjusting handle wheel is connected to the adjusting part or to the lever. Furthermore, it is particularly advantageous if the controllable drive motor with an adjustable or safety joint is constructed as a separate mountable unit, in which case the force transmission is slip-free. Via transmission and adjustment spindle

[It will be done. It is a universal empirical fact that users of devices are usually not aware of why a product is so particularly convenient and practical to operate. Therefore, those directly involved in the production have no idea about the facts that lie on the basis of a convenient solution. This fact became clear when placing the second structure group in the region of the legs of the roll frame. When that solution was realized in the experimental setup, all parties could no longer think of a better variant. According to the claims, the pair of grinding rolls is provided with a first structural group on both bearing end sides, and a second structural group common on both bearing end sides and a common second structural group on both bearing end sides. Means can be provided for automatic parallel adjustment, or the pair of grinding rolls can be provided with a first structure group and a second structure group in each case on both bearing ends. Next, two embodiments of the present invention will be explained with reference to the drawings. Reference will now be made to FIG. 1, in which the adjusting member can be seen as a first structural group 1 and the controllable adjusting drive as a second structural group 2. Two grinding rolls 41 and 42 are supported on a common carrier 8. 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 equipment 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. Grinding roll 41
The actual fine adjustment of and 42 takes place via an adjusting spindle 8, which by rotation directly moves the adjusting arm 9 around a fixed rotary bearing 10. The short upper end of the adjusting arm 9 is connected in a force-locking manner to the pivotable bearing housing 7 via a tension rod 11. The force transmission is carried out on one side by an overload-spring protection device 12
This is done through the blade, which is part of the blade. On the opposite side, an adjustable counter-holding stud 13 on the tension rod 11 and a pressure measuring device 14 with a pressure indicator 5 are arranged. In order to be able to adjust the grinding rolls in parallel during service operation, the correction can be made on each required side via the adjusting screws 43, 44 1. It can be implemented by The adjusting spindle 8 is held stationary by a bearing 10 and is connected via a steering wheel 16 with a directly integrated display clock 17 (FIG. 2) or via motor means, a transmission chain 18 and a reduction motor or drive motor. 19. The drive motor 19 is fixed to the roll frame 26 and is directly connected via a safety joint 20 and a chain wheel 21 to the transmission chain 18 or to the adjusting spindle 8 . It goes without saying that the adjusting motor 19 and the safety coupling 21 can be fixed in their respective other positions, for example externally on the rolling mill. The free inner space of the column leg appears to be the optimum location for locating the adjustment drive. Safety joint 2
0 is anyway a coupling which transmits a minimum torque and, at a certain preselectable torque, releases the forced connection by slipping or no longer transmits the adjusting force of the motor means beyond a certain torque. It can be a joint that does not. However, from 7k,
The minimum rotational moment must be chosen so large that it can be overcome with the hand wheel and the grinding gap adjustment can be carried out by hand without co-rotating the reduction motor. Further, since the transmission chain 18 and the position indicator 22 are directly connected via the chain 28 and the chain wheel 24, each movement of the transmission chain 18 is recorded on the position indicator 22, and the movement of the transmission chain 18 is recorded in the position indicator 22, and the position indicator 22 is directly connected to the position indicator 22. further manipulated. Figures 1 and 2
As can be deduced from the representation in the figure, very few elements are required for the motor adjustment means, and the drive motor 19 with the joint 20 being the largest element is particularly advantageously free below the roll frame stand 26. Since it can be arranged in the area of a suitable recess, it is also possible at any time to retrofit the second structural group 2 or automatic grinding gap adjustment into an appropriately constructed conventional mill roll frame. The crushing plant roll frame is usually constructed in a double structure.
This is indicated by centerline 27 in FIG. It is. Each pair of rolls 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 this case, one possibility is shown in each case of a steering wheel 16 with a display clock 17 on both sides. Both bearing sides each have one drive motor 19 and a position indicator 2
2 and a transmission chain 18. The roll spacing on both bearing sides can then be controlled via motor means 18 , 19 or adjusted via the hand wheel 16 . In place of the display clock 17, a digital display 45 and input pushbuttons 46 can also be used. On top of that,
It is also conceivable to provide the steering wheel 16 and the input push button 45 at the same time for a certain period of time to accommodate the operator. =22- A simpler design is shown in Figure 3. 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. For further simplification, instead of the steering wheel 16 and the display clock 17,
Corresponding adjustments in the direction of service adjustments NUT 43.44
(FIG. 1), in which case, for example, for very rare changes in the product mix, or for relatively large mills with always the same final product, the steering wheel 16 with display clock 17 or do not need. The adjustment of the grinding gap takes place via the drive motor 19, the adjustment path being transmitted via the chains 39 and 40 to the other bearing sides. 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 as well. for that,
Novel The present invention makes a very valuable contribution. FIG. 1 shows a drive belt 28 for driving the grinding rolls 1 and 2.
It's too much to show. Also in the drive system, the required electrical power-measuring and display device 29 can be provided. 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 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 80 (FIG. 1). Particularly when using raised rollers, the roll spacing monitoring device makes it possible in a simple manner to prevent erroneous commands that could lead 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. It is particularly advantageous to control all the signals of the roll frame in an integrated manner via a mechanical calculator 81, which receives the necessary reference values from a central computer 32 with a storage 33. can do. The position indicator 22 is shown in FIG. 3 with a position limit switch 34 which is adjustable to a preselectable limit value, thus preventing automatic misadjustments. The position limit value switch 34 in the illustrated position has the advantage that it also prevents manual misadjustments. This is because the steering wheel is automatically adjusted, and the transmission check 7
18 and the chain 23 will be moved by a corresponding distance. The position indicator 22 has an input-information device 85 which, corresponding to the digital display 45 and the input pushbutton 46, receives or transmits the corresponding signals of the mechanical calculator 31, as well as the regulating motor 19. Can be connected very accurately. With the same intention, pressure measurement and display devices 14, 15 can be connected to the mechanical calculator 81. 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 the opposite. has meaning. The opposite is true for smooth rolls where pressure monitoring provides many benefits. The calculator 37 and the designated signal conductor 38 allow the computer 32 or the storage device 88 to control an integral number of roll frames, possibly all roll frames, of the mill and, if necessary, also integrate adjustment functions. must be suggested.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a grinding gap adjustment device for a flour mill rolling mill having motor adjustment means; Fig. 2 is a front view of a roll frame corresponding to Fig. 1 with motor adjustment and manual adjustment on both sides; The figure shows a variant of figure 2, but a front view of the roll frame with manual adjustment on both sides and only one motor drive for parallel adjustment of the grinding rolls, figure 4 shows a motor adjustment like computer means. FIG. 3 schematically shows the means. 7, 8.9.11...Adjustment member 12...Pressure overload safety device 19-・Shell drive motor 41.42...
・Crushing roll Showa S year/February mulberry day

Claims (23)

[Claims] (1) a mill roll frame having adjustment members and means for automatically adjusting the grinding rolls (41, 42), the grinding rolls (41, 42) having a mechanical pressure overload safety device (12); In a grinding gap adjustment device for grinding, a controllable drive motor (19) connects the adjustment members (7,
8, 9, and 11). (2) The crushing gap adjusting device according to claim 1, wherein the transmission means has a joint (20). (3) The position indicator (22') is connected to the spindle (22') via a transmission means or a non-slip transmission member (23').
8), the grinding gap adjusting device according to claim 1 or 2, which is connected to 8). (4) Grinding gap adjustment device according to claim 2 or 3, characterized in that the joint (20) is designed as a particularly advantageous adjustable safety joint (20). (5) the transmission means has a slip-free transmission member, for example a toothed rim or chain (18), and the position indicator (2);
3. The grinding gap adjusting device according to claim 1, wherein the grinding gap adjustment device 2) is directly connected to a slip-free transmission member via a chain (23) or to the drive side of a joint (20). (6) The position indicator (22) has a digital display (45)
and an input pushbutton (46) is associated in the area of the roll frame for adjusting the grinding rolls (41, 42) via the drive motor (19).
The grinding gap adjustment device according to any one of items 1 to 5. (7) The adjusting spindle (8) is directly driven by a slip-free transmission member, and the adjusting wheel (16) is fixed to this adjusting spindle. The grinding gap adjustment device according to any one of the above. (8) Grinding gap adjusting device according to claim 7, wherein the adjusting wheel (16) has a position display device (17) formed as a display clock. (9) The grinding gap adjusting device according to claim 3, wherein the position indicator (22) is provided with a position limit value transmitter (34) for limiting the adjustment path. (10) The adjustment element is controlled by the computer (31) via the drive motor (19) or by the corresponding reference value planning (3).
3) The grinding gap adjustment device according to claim 1, which can be remotely controlled by. (11) for a number of roll frames - a common computer (32) and one or more reference value storage devices (33);
The crushing gap adjustment device according to claim 10, to which - is attached. (12) The grinding gap adjusting device according to claim 1, wherein the grinding roll pair is provided with grinding pressure measurement and display devices (14, 15) and a pressure limit value switch. (13) The grinding according to claim 1, wherein the grinding roll pair is equipped with an electrical required output-measuring and display device (29) and a power consumption limit value switch (FIG. 1). Gap adjustment device. (14) The grinding according to claim 1, wherein the grinding roll pair is provided with a roll distance measurement and display device (30, 36) and a distance limit value switch (FIGS. 1 and 4). Gap adjustment device. (15) Grinding gap adjustment device according to claim 1, in which a limit value switch (pressure-power consumption-distance) is arranged as a safety element in an effective manner simultaneously on the motor adjustment device and on the manual adjustment device. . (16) Grinding gap adjustment device according to claim 1, wherein the adjustment member has an engagement or disengagement device (4, 5, 6) for the movable roll (42). (17) The adjustment element has a lever-transmitted adjustment element in the region of the grinding rolls (41, 42) as a first structural group (1), and a controllable drive motor (19) in the second Grinding gap according to claim 1, which is a structural group (2) and can be arranged at a distance from the adjustment element and can be connected to it via a transmission element (18). Adjustment device. (18) The adjusting part has a lever (9) with a ratio of greater than 1:2, particularly advantageously greater than 1:3, and the drive motor (19) has a relatively long lever part, particularly advantageously a spindle ( 8), the grinding gap adjusting device according to claim 17. (19) Grinding gap adjustment device according to claim 18, in which the adjustment part or lever (9) is associated with a spindle (8) having an adjustment handle wheel (16). (20) A controllable drive motor (19) is formed as a separate attachable unit with an adjustable or safety coupling (20) and engages the transmission member (18) via a spindle (8). The grinding gap adjusting device according to claim 19. (21) Grinding gap adjustment according to any one of claims 17 to 20, wherein the second structural group (2) is arranged in the range of the legs of the roll frame. Device. (22) The pair of grinding rolls is provided with one first structure group and one second structure group (2) on each of the two supporting ends (FIG. 2), Claim 17 The grinding gap adjustment device according to any one of Items 1 to 21. (23) In the pair of crushing rolls, one first structure group (1) is attached to each of both supporting ends, and a common second structure group (2) is attached to both supporting ends, and a common second structure group (2) is attached to both supporting ends. Means (39, 40) for automatic parallel adjustment of the bearing end side are provided (FIG. 3), in which case the first structural group (1) is moved via a slip-free transmission member (39) The grinding gap adjusting device according to any one of claims 17 to 22, which is adjusted by two structural groups (2).