CN1003842B - Roll distance adjusting device of roll crusher - Google Patents

Abstract

The rolling distance adjustment device of the roller crusher has two grinding rollers in the machine, an adjustment mechanism and a device for automatically adjusting the rolling distance through a remote control transmission motor, and the latter is coupled with the adjustment mechanism through a high-speed clutch and a transitional transmission device: The adjustment mechanism constitutes a first closed combination of its own with lever-shifted adjustment elements (the latter with longer and shorter lever arms), which are arranged laterally in the area of the grinding roller: the transmission The motor and the clutch form a second type of closed combination part, which is arranged at a distance from the first type of combination part. At this time, the adjustment force drawn by the transmission motor acts on the longer lever arm of the adjustment part: the adjustment mechanism is additionally equipped with Manually adjust the device.

Description

Roll gap adjusting device of roller crusher

The invention relates to a roll gap adjusting device of a roll crusher, which comprises two grinding rolls, one of which is a rotatable roll, in a shell of the device, an adjusting mechanism and a device for automatically adjusting the roll gap by a remote control transmission motor, wherein the adjusting mechanism is coupled with the adjusting mechanism through a transitional appliance by a clutch intermediate connection.

For the roll gap adjustment device of a roller crusher, three special operating states have to be considered:

If larger foreign bodies, such as screws, enter the nip, the pressure impact forces that occur must be immediately reduced (absorbed), usually by mechanically overstressing the grinding roller pair.

Second, without abrasive, the grinding rolls (especially when they are anilox rolls) must automatically enter a position of mutual disengagement, otherwise the two grinding rolls will grind each other, damaged by their different revolutions.

Finally, for normal grinding operations, the roll pitch of the grinding rolls must be adjustable with high precision.

Experience to date has shown that mechanical roll gap adjustment devices are advantageous over other, for example corresponding hydraulic adjustment devices, and that roll gap adjustment of a roll crusher, although the adjustment process itself is simple, is a rather complex process as it is seen in european patent 13023 in general. For example, it has not been possible to calculate exact parameters (for example grinding pressure or motor power consumption) in a satisfactory manner until now, which can be used as appropriate starting parameters for automatically adjusting the grinding rolls, i.e. the roll gap (roll spacing), according to the respective requirements. From an economic point of view, it is also necessary to limit the number of influencing parameters that are necessary for the adjustment and that can be collected. Each automatic adjustment is performed without direct detailed view from the outside, and is not manually operated under normal conditions. All unpredictable interference factors (which may be caused by various reasons) are always an important part of the operation of the apparatus in order to optimize the operation of the grinding device. If both automatic adjustment and manual operation are required, a very expensive complete set of equipment must be purchased.

The object of the present invention is to provide a particularly advantageous solution for automating the adjustment of the roll gap while retaining the possibility of manual operation of the roll crusher stand.

According to the invention, this is achieved for the device named at the outset in that the adjusting mechanism forms a first closed assembly part of its own with lever-variable adjusting parts (the latter with longer and shorter lever arms) arranged on the side of the grinding roller, in that the drive motor and the clutch form a second assembly part arranged at a distance from the first assembly part, in that the adjusting force introduced by the drive motor acts on the longer lever arms of the adjusting parts, and in that the adjusting mechanism is additionally equipped with manual adjusting means.

Heretofore, solutions for automatically operable roller crushers have always been based on the structural and preferred automatic means instead of manually operated devices, whereas most of the prior art solutions have had a motor with a reduction gear directly connected to the tension links of the adjusting grinding roller, respectively (see fig. 6 of the test comparison european patent nr.13023). In contrast, the solution according to the invention is to integrate the conventional adjusting means into one self-contained, closed component, which soon shows that the path followed according to the invention proves particularly satisfactory and surprisingly has many advantages in practice. The solution according to the invention shows that the replacement of the manual adjustment mechanisms used hitherto by automatic means does not necessarily lead to a new comminution, for example the rollers are to be "softened" or "hardened", etc. More importantly, the stability of the grinding roller adjustment is maintained by the invention.

The device according to the invention is thus complementary to a roller crusher, which can be placed at any time afterwards, however, a part of a mill roller crusher should be equipped with automatic means. Since roller crushers have been a very compact machine for the way of operation (processing of powdery material), the second set of components arranged according to the invention does not increase the difficulty of using other elements within the nip of the grinding roller pair. The roll crusher stand may then even be operated not by automatic means, if desired, but by manual adjustment means of the adjustment mechanism.

The invention is of a design with several advantages, the clutch of which forms an adjustable sliding clutch, which makes it possible to automate the grinding roller adjusting mechanism in an excellent manner according to a predefined setpoint value, for example the distance between the grinding rollers. The adjustment can be carried out according to a predefined program, i.e. a setpoint value system diagram. Since interference is unavoidable in practice, the slip clutch should limit erroneous operation. This also prevents the grinding gap or the pressure from being unintentionally set to too high a value and the roller crusher or the roller bearings from being destroyed.

The fact that the grinding roller bearing end has a first combination part on both sides and the bearing end has a second combination part on both sides, and the means for automatically adjusting the rollers in parallel, the first combination part can be controlled by the second combination part through a non-slip transition transmission, proves to be advantageous in operation. In this way, the equipment can be supplemented particularly simply on the already put into operation roller crushers, which can allow to maintain the great economic value that it represents for all the existing roller crusher stands, and the roller crushers can be supplemented with other automation equipment without the need to construct new roller crushers.

In view of the ease of operation, a further advantageous embodiment of the invention is that the drive motor drives the adjusting shaft via a transitional drive, for example a chain, which acts on a longer lever arm of the adjusting part, the longer lever arm being particularly preferred over the shorter one. The adjustment shaft is provided with a manual adjustment wheel which is generally provided with an indicating device in the form of an indicator gauge. The manual adjustment wheel is generally equipped with an indicating device, i.e. a position indicator, which generally forms the shape of an indicator meter, which can be structurally integrated directly into the hand wheel as a measuring meter. In this way, the hand wheel correspondingly receives each automatic correction value at the same time and correspondingly displays it on the hand wheel. It is further advantageous if the second combination part is mounted in the foot section of the roll crusher.

Another advantageous embodiment of the roll gap adjustment device according to the invention is a position signal device, which is controlled by the transition drive or the adjustment mechanism. Preferably, such a position signal device, for example a potentiometer, is provided. In a particularly advantageous manner, the transition drive transmits the actuating force via a slip-free transition drive, in which case the potential signal device is coupled directly via a chain to either the slip-free transition drive or to the drive side of the clutch. The non-slip transition sensor is preferably a gear belt, or a chain or the like, so that the position signal device can be driven simultaneously.

The position signal device, which is generally connected to a suitable position indicator, can display and feed back the exact position of the two grinding rollers at any time, in particular when the position indicator is arranged on the drive side of the clutch, i.e. directly positively connected to the adjustment mechanism. The practical operation proves that the digital display and the manual input keys are arranged on the shell of the roller crusher, and the transmission motor is controlled by an operator of the position signal device, so that the roller crusher is more suitable. This can be achieved by a responsible operator, for example a mill length, suitably controlling the drive motor if the desired roller position value is obtained accordingly.

The roll gap adjusting device of the invention has the same advantageous construction form that a digital display and manual input keys are arranged on the shell of the roller crusher for controlling the transmission motor, and a program-controlled computer is also preferably arranged for controlling the transmission motor, and a common central computer connected with the computers of the roller crushers in series is also preferably arranged for the program-controlled computer. In some cases, however, it is also advantageous not to implement a series connection but to provide only a single computer (with one or more nominal value memories, storing the values of the roller crushers). By means of the above measures, it is possible to control all the roller crushers directly in accordance with a predefined setpoint value system diagram, i.e. an exact control process.

In this case, the roll gap adjusting device may be a part of a precise adjusting device in addition to the control process, and the grinding result, that is, the fineness of the particles according to the width of the roll gap is selected as a factor to be adjusted and controlled according to the roll gap.

The output signal device of the grinding pressure tester and/or the limit switch of the auxiliary grinding roller can be installed at the input end of the computer, and the limit switch and/or the limit switch can be selectively used at the moment, so as to protect the interference condition caused by the wrong control command sent by the rolling distance adjustment from overload. Typically, the output signal device of the power consumption tester and/or the power consumption limit value switch of the auxiliary grinding roller is arranged at the input end of the computer. However, it is likewise generally possible to provide the output signal device of the auxiliary roller distance tester and/or the distance limit value switch at the input of the computer.

It is also advantageous if an adjustable safety element is provided for the selectable limit value of the grinding pressure or of the power consumption or of the roller spacing, so that both the motor and the manually operated adjustment device can be acted upon.

The invention is in principle further illustrated in the following according to the schematic drawings:

FIG. 1 shows a roll gap adjustment device for a roller crusher with a motor adjustment mechanism according to the present invention;

FIG. 2 is a schematic front view of the roller crusher according to FIG. 1, with both motor adjustment and manual adjustment mechanisms;

Fig. 3 shows a further embodiment which differs from that shown in fig. 2 in that the manual adjustment mechanism is provided on both sides, but only one motor drive is provided for parallel adjustment of the grinding roller;

Fig. 4 schematically illustrates a motor adjusting mechanism of the roll gap adjusting apparatus of the present invention and a computer thereof.

Fig. 1 shows a roller crusher with an adjusting mechanism as a first combination 1 and a controllable adjusting gear as a second combination 2. The two grinding rollers 41 and 42 are supported by a common carrier 3. The roller 42 is fixed to a fixed eccentric pin 4 which can be turned around, in which case the activation and deactivation is controlled by means of a lever 5 and a release cylinder 6. The eccentric pin 4 is rotated by the turning motion of the lever 5 and causes the horizontal displacement of the lower portion of the turnable bearing box 7, thereby achieving the purpose of coarse adjustment of the distance between the two grinding rolls. However, such devices are very inaccurate for accurate adjustment. Thus, such a device is only used when the two grinding rollers 41 and 42 are brought into the start-up or disconnection position, i.e. into the two fixed positions. The actual fine adjustment is achieved by means of the adjusting shaft 8, which by rotation directly moves the adjusting arm 9 about a fixed pivot bearing 10. The shorter lever arm on the adjusting arm 9 is connected in a power-driven engagement with the pivotable bearing housing 7 via a connecting rod 11. The energy transfer is achieved by the knife, which on one side is part of the overload spring protection. On the opposite side, the connecting rod 11 is provided with an adjustable bracket button 13 and a pressure testing device with a pressure indicating device 15. To be able to adjust the grinding rolls in parallel during operation, the correction work on the desired side can be done by means of adjusting screws 43 and 44. The adjusting shaft 8 is held stationary by means of a bearing 10', which can be operated only by means of a hand wheel directly fitted with an indicator 17 (fig. 2), or by motor means, i.e. by means of a transitional chain 18 and an electric or transmission motor with a reduction gear. The drive motor 19 is fixed to the roller crusher frame 26 above the sliding clutch 20 and the sprocket 21, the sprocket 21 being directly connected to the transition chain 18 and the adjustment shaft 8.

The adjustment motor 19 and the slip clutch 20 may also be fixed in any other suitable place, for example outside the roll crusher. However, in view of the optimization of the overall ratio, practice has shown that the free interior space of the leg portion is the most suitable place for the installation of the adjusting gear. Each suitable slip clutch can be used as slip clutch 20 as long as it can transmit at least a torque and can release the positive connection by slipping at a certain preselectable torque, i.e. no longer transmit the adjusting force of the motor means exceeding a certain torque. The lowest torque should be selected so that it can be overcome by the hand wheel 16 so that the roll gap can be manually adjusted without rotating the geared motor 19 in one pass.

Furthermore, the position signal device 22 is directly connected to the transition chain 18 via the chain 23 and the sprocket 24, so that every movement of the transition chain 19 is recorded in the position signal device 23 and conducted further to the desired location. As can be seen from fig. 1 and 2, few individual elements are required for the motor adjustment means. The largest elements, the drive motor 19 and the clutch 20, are normally arranged in the area of the gap underneath the roll crusher frame 26, so that the second component, the automatic adjustment of the roll gap, can be arranged at any time in addition to the correspondingly constructed existing roll crusher frame. In this way, the components can also be made in the form of closed modular components in a suitable configuration, so that the supplementary installation work can be facilitated and accelerated. Since the roll crusher stand is generally of a double construction, it is schematically indicated in fig. 1 by a centre line 27 of the imaginary point. Each roller pair of the two half-roller crusher stands may or may not be equipped with such an automatic adjustment mechanism.

In the construction shown in fig. 2, each bearing side is provided with a component 1 and 2. In this case, there is a possibility that a hand wheel 16 with an integrated indicator 17 is provided on both sides. The two bearing sides each have a drive motor 19, a position signal device 22 and a transition chain 18. Thus, on both bearing sides, the roller spacing can be controlled by motor 19 and chain 18, or adjusted by the operator via hand wheel 16. Instead of the dial 17, however, a digital display 45 and manual entry keys 46 may be used. It is also contemplated that the hand wheel 16 and manual input keys 45 may be provided simultaneously for a period of operator habit. It is also possible to arrange the digital display 45 or the indicator 17 separately or to install both at the same time, which may be advantageous in some cases.

Fig. 3 is an alternative to the structure of fig. 2. In this case, for the purpose of single correction, only the hand wheel 16 and the indicator 17 are arranged on the left and right, i.e., in a duplex arrangement. There is a simpler solution, in which instead of arranging the hand wheels on the left and right, only the hand wheel 16 is arranged. The correction necessary on one side can be done by means of nuts 43 and 44 (fig. 1), so that only one hand wheel 16 with an indicator 17 is needed, which is suitable for larger mills, with little change in the product mix, i.e. always the same end product. The adjustment of the roll gap in fig. 3 can also be accomplished by means of the drive motor 19, in which case the adjustment travel is transmitted to the other bearing side via the chains 39 and 40. In this way the grinding rolls are adjusted in parallel by corresponding automation.

Fig. 1 shows the drive mechanism 28 of the grinding rollers 41 and 42 (only in dashed lines). An electrical power consumption test and indicator 29 may also be provided in the transmission system. In this way, the electrical power consumption can be limited to a lower limit and an upper limit, and when it exceeds a preselected range, the grinding rolls are separated from each other.

Another possibility is to determine the effective spacing of the bearing housing components by means of a roller spacing test and indicator 30 (compare fig. 1). In particular when using anilox rolls, erroneous commands, which would lead to mechanical damage of at least a part of the roll crusher, can be reliably prevented in a simple manner by means of the roll gap monitoring device.

Fig. 4 again illustrates such other control connection supplementing devices. According to fig. 4, all signals of the roll crusher stand are coordinated and controlled by means of a computer 31, which can then call the necessary nominal values from a central computer 32 with a memory 33. According to fig. 4, the position indicator 22 is also provided with a position limit value switch 34, which can adjust the desired limit value in order to prevent erroneous adjustment by automatic means. The advantage of the position limit switch 34 in the position shown in the figures is that it also prevents incorrect manual adjustment, since the hand wheel and the automatic adjustment mechanism can cause a corresponding displacement of the travel of the transition chain 18 and the chain 23. The position signal device 22, as well as the adjustment motor 19, can be connected to an input-output device 35 which receives corresponding signals from the computer 31 and sends them out, which corresponds to the digital display 45 and the manual input keys 46 in fig. 2. Also, the pressure test and display devices 14 and 15 may be connected to the computer 31. Depending on the degree of disassembly of a roller crusher, one or several safeties may be fitted thereon. If a web roll is installed, the grinding pressure monitor does not function much, but rather it is significant to monitor the grinding roll spacing via the position display 22 or rangefinder 36. The situation is the opposite for a smooth roll, for which the pressure monitoring benefits are great. The computer 37 and the signal line 38 in fig. 4 should be such that the computer 32 with the memory 33 controls most, in some cases even all, of the mill stands and coordinates the adjustment functions if desired.

It is particularly advantageous if the digital display 45 emits a display value in the same way that the hand wheel display displays a value, such as a value displayed as a clock (for example, the hand wheel is in the 15.30 position, the digital display shows 15: 30).

The great advantage is also represented by the fact that the empirical values of the non-automated or non-remote control roller crusher stands are compared, and the composition or improvement of the corresponding control program is evaluated.

Claims (5)

1. The roller mill gap adjustment device has a rotatable grinding roller, an adjustment mechanism and a device for automatically adjusting the grinding gap through a remote control drive motor. The adjustment mechanism (7-9, 11) constitutes a first type of assembly (1) thereof, which has a lever-shift adjustment element (9) between the grinding rollers (41, 42), characterized in that: - the drive motor is connected to a transition gear coupled to an adjustment mechanism via a clutch, - the drive motor (19) and the clutch (20) constitute a second assembly (2), which is mounted at a distance from the adjustment mechanism (7-9, 11), - the adjusting force derived from the drive motor (19) is coupled to the longer lever arm (9), the adjustment mechanism (7-9, 11) is additionally equipped with a manual adjustment device (8, 16), The intermediate transmission acts without slip, the position signaling device (22) is coupled directly via the chain (23) to the non-slip overload transmission (39) or to the drive side of the clutch (20). 2. The rolling distance adjustment device according to claim 1, characterized in that the clutch (20) is designed as an adjustable slip clutch. 3. A rolling distance adjustment device according to claim 1 or 2, characterized in that the transmission motor (19) drives the shaft (8) via a transition transmission device, the shaft (8) acting on the longer lever arm (9') of the adjustment member (9), and a manual adjustment wheel (16) is mounted on the shaft (8), and the manual adjustment wheel is generally equipped with a display device (17) in the form of an indicator. 4. The rolling distance adjustment device according to claim 1, characterized in that the second component (2) is arranged in the region of the foot of the roller crusher. 5. A rolling distance adjustment device according to claim 1, characterized in that a first assembly unit (1) and a second assembly unit (2) are mounted on each side of the grinding roller (41, 42) bearing.

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