HIGH-PRESSURE ROLLER MILL HAVING VIBRATING LATERAL WALLS

Abstract

A high-pressure roller mill for comminuting brittle grinding stock having at least two adjacent rotating grinding rollers which rotate in opposite directions and form a nip therebetween, wherein a first grinding roller is a fixed roller and a second grinding roller is an idle roller, and a lateral wall at each of the two ends of the nip. Each lateral wall has a vibration device which sets the lateral wall into mechanical vibration.

Claims

1.-7. (canceled)

8. A high-pressure roller press for comminuting brittle material for grinding, the high-pressure roller press comprising: at least two grinding rollers arranged next to one another and configured to rotate in opposite directions and form a roller gap between them, wherein a first grinding roller of the at least two grinding rollers is a fixed roller and a second grinding roller of the at least two grinding rollers is a floating roller, and a respective lateral wall at two ends of the roller gap, wherein the respective lateral wall has a vibration device which makes the respective lateral wall mechanically oscillate.

9. The high-pressure roller press as claimed in claim 8, wherein the vibration device operates with a frequency between 10 Hz and 150 Hz, and introduces an input of energy between 0.1 kJ/m.sup.3 and 10 kJ/m.sup.3 into the material for grinding (M).

10. The high-pressure roller press as claimed in claim 8, wherein the vibration device has a regulating device configured to regulate a vibration intensity in accordance with the energy consumed by the vibration device for operation, wherein an increased energy consumption results in a reduction of the vibration intensity and a reduced energy consumption results in an increase in the vibration intensity.

11. The high-pressure roller press as claimed in claim 10, wherein the regulating device is further configured to perform regulation in accordance with an energy consumption of a roller drive, wherein an increased energy consumption of the roller drive results in a reduction in the vibration intensity and a reduced energy consumption results in an increase in the vibration intensity.

12. The high-pressure roller press as claimed in claim 10, wherein the vibration device is further configured to be regulated in accordance with the gap width of the roller gap, wherein a larger gap width results in an increase in the vibration intensity and a smaller gap width results in a reduction in the vibration intensity.

13. The high-pressure roller press as claimed in claim 10, wherein the vibration device is further configured to be regulated in accordance with a tendency of the floating roller to rotate about a vertical axis (A), wherein the vibration intensity is increased as a rotary oscillation frequency of the floating roller increases, and the vibration intensity is decreased as the rotary oscillation frequency of the floating roller decreases.

14. The high-pressure roller press as claimed in claim 8, further comprising: a manual triggering device for the vibration device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The invention will be explained in more detail on the basis of the following figures, in which:

[0024] FIG. 1 shows a sketch of a high-pressure roller press according to the invention in a side view,

[0025] FIG. 2 shows a plan view of a roller gap, covered with material for grinding, of a high-pressure roller press without lateral walls, here in a view of the grinding rollers,

[0026] FIG. 3 shows a plan view of a roller gap, covered with material for grinding, of a high-pressure roller press with lateral walls from the PRIOR ART,

[0027] FIG. 4 shows a plan view of a roller gap, covered with material for grinding, of a high-pressure roller press according to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] FIG. 1 shows a diagram of a high-pressure roller press 100 according to the invention in a side view. The high-pressure roller press 100 according to the invention for comminuting brittle material for grinding M has at least two grinding rollers 110, 120, which are next to one another and rotate in opposite directions. The two grinding rollers 110, 120 form a roller gap W between them, through which the material for grinding M is drawn without, or with only very little, relative slippage of the grinding rollers 110, 120. A first grinding roller (110) is a fixed roller and a second grinding roller 120 is a floating roller. The floating roller 120 has two degrees of freedom of movement. It can be removed from the fixed roller 110 with widening of the roller gap W and also rotated about the vertical axis A by fractions of an angular degree. In order to avoid the material for grinding M flowing to the opening, which is in the plane of the drawing, of the roller gap W and falling out there, a lateral wall 150, 150 is provided at both openings of the roller gap W. According to the concept of the invention, a respective lateral wall has a vibration device, like a hydraulic plunger, which makes the respective lateral wall 150, 150 mechanically oscillate. This mechanical oscillation is transferred to the material for grinding M, which is located close to the respective end of the roller gap W and flows on or in the compaction zone. This oscillation fluidizes the material for grinding M and thereby assists it in passing through the roller gap W, in which a pressure of 50 MPa or higher prevails.

[0029] FIG. 2 shows a plan view of a roller gap W, covered with material for grinding M, of a high-pressure roller press 100 without lateral walls 150, 150, in this instance in a view onto the grinding rollers 110, 120. The material for grinding M settles on the roller gap W as loose fill and covers the roller gap W. Arrows are depicted on the material for grinding M which show the approximate flow movement of the material for grinding M on the roller gap W into the region of the compaction zone. The actual movement of a particle of material for grinding does not necessarily amount to the length of the arrow, but may also be only a fraction thereof along the path of the arrow. A diagram is shown on the right next to the sketch in FIG. 2, the diagram illustrating the possible pressure p in the roller gap W as position x along the roller gap W. In this open high-pressure roller press, the pressure drop in the roller gap W toward the ends is very great, and therefore the pressure in the roller gap W drops considerably in the region of the roller ends by up to 50 MPa. As a result of this, there is no longer efficient comminution by compaction in the region of the roller gap ends.

[0030] FIG. 3 shows a plan view of a roller gap W, covered with material for grinding M, of a high-pressure roller press 100 with static lateral walls 150, 150, in this instance in a view onto the grinding rollers 110, 120. The pressure drop in the roller gap W to the roller shoulder, that is to say in the region of an end of the roller gap, is considerably reduced in relation to the arrangement in FIG. 1, but is still present. This effect is referred to as peripheral zone effect. This effect is partially caused by the friction at the lateral wall. The lateral wall forms a flow barrier and the resulting friction rises as the pressing pressure increases, since the counterpressure at the lateral wall surface rises. The more strongly the material is pressed out of the gap against the lateral wall, the greater the coefficient of friction becomes and thus less material flows into the peripheral zone of the gap. Consequently, the compression of the material bed and thus the resulting pressure in the peripheral zone are correspondingly reduced. The result of this is rather a somewhat bell-shaped pressure distribution along the roller gap.

[0031] FIG. 4 shows a plan view of a roller gap W, covered with material for grinding M, of a high-pressure roller press 100 according to the invention with vibrating lateral walls 150, 150, in this instance in a view onto the grinding rollers 110, 120. In this case, the vibration is generated by a vibration device 160, the intensity of which is optionally regulated by a regulating device 170, like a damper. The respective vibrating lateral wall (150, 150) maintains the pressure at the ends of the roller gap W, since the material for grinding M can flow into the roller gap W unobstructed. The vibration assists the material for grinding M in passing through the roller gap. The unobstructed material flow along the entire roller width ensures a uniform pressure profile and uniform wear of the grinding rollers 110 and 120, with the result that no considerable tapering forms.

[0032] The systems and devices described herein may include a controller or a computing device comprising a processing and a memory which has stored therein computer-executable instructions for implementing the processes described herein. The processing unit may comprise any suitable devices configured to cause a series of steps to be performed so as to implement the method such that instructions, when executed by the computing device or other programmable apparatus, may cause the functions/acts/steps specified in the methods described herein to be executed. The processing unit may comprise, for example, any type of general-purpose microprocessor or microcontroller, a digital signal processing (DSP) processor, a central processing unit (CPU), an integrated circuit, a field programmable gate array (FPGA), a reconfigurable processor, other suitably programmed or programmable logic circuits, or any combination thereof.

[0033] The memory may be any suitable known or other machine-readable storage medium. The memory may comprise non-transitory computer readable storage medium such as, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. The memory may include a suitable combination of any type of computer memory that is located either internally or externally to the device such as, for example, random-access memory (RAM), read-only memory (ROM), compact disc read-only memory (CDROM), electro-optical memory, magneto-optical memory, erasable programmable read-only memory (EPROM), and electrically-erasable programmable read-only memory (EEPROM), Ferroelectric RAM (FRAM) or the like. The memory may comprise any storage means (e.g., devices) suitable for retrievably storing the computer-executable instructions executable by processing unit.

[0034] The methods and systems described herein may be implemented in a high-level procedural or object-oriented programming or scripting language, or a combination thereof, to communicate with or assist in the operation of the controller or computing device. Alternatively, the methods and systems described herein may be implemented in assembly or machine language. The language may be a compiled or interpreted language. Program code for implementing the methods and systems described herein may be stored on the storage media or the device, for example a ROM, a magnetic disk, an optical disc, a flash drive, or any other suitable storage media or device. The program code may be readable by a general or special-purpose programmable computer for configuring and operating the computer when the storage media or device is read by the computer to perform the procedures described herein.

[0035] Computer-executable instructions may be in many forms, including modules, executed by one or more computers or other devices. Generally, modules include routines, programs, objects, components, data structures, etc., that perform particular tasks or implement particular abstract data types. Typically, the functionality of the modules may be combined or distributed as desired in various embodiments.

[0036] It will be appreciated that the systems and devices and components thereof may utilize communication through any of various network protocols such as TCP/IP, Ethernet, FTP, HTTP and the like, and/or through various wireless communication technologies such as GSM, CDMA, Wi-Fi, and WiMAX, is and the various computing devices described herein may be configured to communicate using any of these network protocols or technologies.

[0037] While at least one exemplary embodiment of the present invention(s) is disclosed herein, it should be understood that modifications, substitutions and alternatives may be apparent to one of ordinary skill in the art and can be made without departing from the scope of this disclosure. This disclosure is intended to cover any adaptations or variations of the exemplary embodiment(s). In addition, in this disclosure, the terms comprise or comprising do not exclude other elements or steps, the terms a or one do not exclude a plural number, and the term or means either or both. Furthermore, characteristics or steps which have been described may also be used in combination with other characteristics or steps and in any order unless the disclosure or context suggests otherwise. This disclosure hereby incorporates by reference the complete disclosure of any patent or application from which it claims benefit or priority.

LIST OF REFERENCE SIGNS

[0038] 100 High-pressure roller press [0039] 110 Grinding roller [0040] 120 Grinding roller [0041] 150 Lateral wall [0042] 150 Lateral wall [0043] 160 Vibration device [0044] 160 Vibration device [0045] 170 Regulating device [0046] A Axis [0047] M Material for grinding [0048] W Roller gap