WO1998011990A1 - Partition for mills - Google Patents

Abstract

A partition for mills, in particular a transfer and discharge wall for tube mills, ball mills and the like, has partition panels (10) arranged to form a slotted wall and/or a rear wall and secured to a wall frame (5). In order to achieve a high wear resistance and simple manufacturing and mounting, the partition panels (10) are secured in a clamping support. The partition panels (10) have recesses (12) on their edges in which fastening elements (20) are guided for fastening strip-shaped or dot-shaped clamping elements (4) which rest on the edge areas of the partition panels (10).

Description

Mill partition

The invention relates to a mill partition according to the preamble of claim 1.

From DE 39 03 255 AI a generic mill partition is known which has a front slit wall in the direction of the material flow and a rear wall with a central air passage opening. The diaphragm wall and rear wall consist of partition wall plates, which are designed like ring segments and are attached to a wall scaffold. The wall structure gives the mill partition the required stability and has essentially radially arranged separating plates, which are also referred to as lifting blades.

The dividing wall panels are attached with tear-off screws, which are positively received in counterbores and secured to mounting flanges of the wall scaffold or the lifting blades. Between the dividing wall plates, radially aligned strips are arranged in the radial direction and preferably along the lifting blades, which protrude at least slightly from the plane of the slot or rear wall. The radial strips have a repelling function, in particular with respect to the grinding media, and are also referred to as wear bars. The strips are relatively narrow and are preferably made of a hard, wear-resistant material. It is attached to the mounting flanges of the wall scaffold or the lifting blades with tear-off screws that are secured with nuts and run from the diaphragm wall to the rear wall.

The arrangement of the radially arranged strips or wear bars requires additional fastening areas on the wall structure. Another cost factor is the fastening and die bores, which have to be drilled into the partition wall panels. These mounting holes and dies have a disadvantageous effect, in particular in the case of hardened, more wear-resistant plates. Since there is an increased risk of breakage with hardening, the corner and edge areas break out when a hole is drilled, which also leads to increased production costs.

The invention is based on the objective of creating a mill partition wall with a fastening arrangement for partition wall plates, which ensure high wear resistance and at the same time particularly low manufacturing and assembly costs.

According to the invention the object is achieved by the features of claim 1. Appropriate and advantageous configurations are described in the description of the figures and contained in subclaims.

The invention is based on the basic idea of fastening partition wall panels of a diaphragm wall and / or a rear wall to a wall or supporting structure of a mill partition wall in such a way that the fastening holes can be dispensed with and the risk of breakage associated therewith is avoided. In order to maintain or increase wear resistance at the same time, clamping elements are provided according to the invention, which have a repelling function and an additional function enable according to the fastening concept according to the invention. The clamping elements according to the invention can be plate-shaped or strip-shaped or punctiform, for example in the form of a "button".

There is advantageously the possibility of flat clamping plates in the radial direction, i.e. as radial strips, or to form a circular ring, i.e. as axial strips, form and arrange for fastening the partition panels. The point-shaped clamping elements, which are referred to briefly below as clamping buttons, can have a different shape and can be, for example, square, polygonal or also round.

For fastening partition wall plates, which are designed in the form of an annular segment and are arranged to form a diaphragm wall and / or a rear wall, radial strips and / or circular strips act as clamping strips and / or clamping buttons with a wall structure of the mill partition according to the invention or with fastening regions of the wall structure. These fastening areas are generally designed parallel to the diaphragm wall and / or rear wall.

The clamping bracket according to the invention is carried out in an extremely advantageous manner in the area of the radial and / or circular edges of adjoining partition wall plates and the inner and outer ring segments of a partition wall.

Recesses are expediently made in these edge regions and are preferably semicircular, in the corner regions also a 90-degree circular cutout, so that round openings are formed when the partition wall panels are placed against one another. To implement the clamp holder according to the invention, the edge regions of a partition wall plate are expediently each provided with at least two edge recesses. In alignment with the edge recesses of two adjoining partition plates, bores or dies are formed in a clamping strip or a clamping button, which rest on the radial edge regions in the fixed state, so that fastening elements can be guided and secured.

Countersunk screws and preferably tear-off screws are used in particular as fastening elements. These fastening elements are guided through the die-drilled holes of the clamping element and through fastening bores of mounting elements of the wall scaffold or the fastening flanges of the wall scaffold and secured on a rear side of the fastening flanges. As a rule, hexagon nuts with washers are used as locking elements.

The clamping strips and clamping buttons are preferably rectangular in cross-section with edge-side contact surfaces for the edge regions of the partition wall panels and have an upper and outwardly directed trapezoidal region. The counterbore is followed by a receiving area in the form of a recess, which is directed toward the partition wall panels and towards the wall scaffold and is designed to be complementary to a head area of the mounting element.

The assembly is carried out in such a way that partition wall panels are placed with their edge areas on the wall structure or the fastening flanges. The edge recesses are form-fitting on the outer surfaces of the assembly elements of the day. Since the assembly elements protrude above the partition wall panels when the partition plates are in place, the terminal strips or clamping buttons, which have receiving areas for the head regions of the mounting elements, can be plugged on. Fastening elements, for example a tear-off screw, are then inserted through the aligned bores and screwed tight against nuts as securing elements. With the fastening of the clamping strips or clamping buttons, the adjoining partition wall panels are thus clamped in and a secure and stable mounting on the wall scaffold.

It is particularly advantageous to design the clamping elements with a height such that grinding media and also grinding stock are carried along and the wear of the partition wall plates can be minimized. This increases the service life of the partition panels.

The formation of the edge recesses of the partition panels is relatively simple by burning out. There is no risk of breakage, so that highly wear-resistant partition panels can advantageously be used.

Such a highly wear-resistant partition wall plate can, for example, be constructed in a sandwich-like manner and have a first layer or plate which consists of a tough, elastic material. A wear layer or plate can be provided as a second layer or plate, which consists of a highly wear-resistant material or also of a tough, elastic material with geometrical bodies arranged therein made of a highly wear-resistant active ingredient or a combination of materials. Significant advantages of the mill partition according to the invention with partition plates which are fastened to a wall frame by means of terminal strips or clamping buttons and locking assembly elements are that the manufacture and assembly can be carried out much more easily, quickly and therefore more cost-effectively. By eliminating the need to drill holes in the partition panels, more wear-resistant materials can be used.

In addition, an additional arrangement of wear bars can be dispensed with, since the clamping elements, in particular the terminal strips, not only serve to fasten the partition wall plates, but at the same time serve as a deflecting function due to their relatively large projection over the diaphragm wall and / or rear wall as lifting strips for the grinding media and the like Serve regrind.

The invention is explained below with reference to a drawing; in this show in a highly schematic representation

Fig. 1 is a plan view of an area of a

Diaphragm wall of a mill partition according to the invention;

Fig. 2 is a section along line A-A of FIG. 1;

Fig. 3 is a section along line B-B of FIG. 1;

Fig. 4 is a section along line C-C of FIG. 1;

Fig. 5 is an exploded view of the clamp bracket according to the invention analogous to Fig. 2; Fig. 6 is a plan view of an area of a

Diaphragm wall of a mill partition according to the invention with an alternatively designed clamping bracket;

Fig. 7 is a section along line A-A of FIG. 6;

Fig. 8 is a section along line C-C of FIG. 6;

Fig. 9 is a plan view of an area of a

Diaphragm wall of a mill partition according to the invention with a further alternatively designed clamping bracket and

10 shows a section along line B-B according to FIG. 9.

1 shows a diaphragm wall of a mill partition with an inner ring segment 3, a middle ring segment 13 and an outer ring segment 23. The middle and outer ring segments 13, 23 consist of partition plates 10 in the form of annular segments, which are provided with slot-shaped openings 15 and adjoin one another at arcuate radial and circular edge regions 11, 31.

In this exemplary embodiment, the partition wall panels 10 are fastened in the region of the radial edge regions 11, which are provided with semicircular edge recesses 12 for this purpose.

The introduction of these edge recesses 12 can be carried out particularly simply by burning out. In doing so the edge recesses 12 are dimensioned such that an opening 17 is formed when the partition plates 10 are placed against one another, which opening is only slightly larger than the outer circumference of a mounting element 6 of the wall structure 5 (see FIGS. 2, 4 and 5).

1 that a radial edge region 11 of a partition plate 10 is provided with at least two edge recesses 12, so that the partition plates 10 are clamped with a clamping element 4, each with at least two fastening elements 20. A clamping strip 8 is used as the clamping element 4, which is arranged almost radially and thereby covers, protects and fixes the radial edge regions 11 of the two adjoining partition wall plates 10.

Details of the clamping attachment of the partition wall plates 10 and the clamping strips 8 which are also used as lifting strips can be seen from the following sectional views of FIGS. 2 to 4 and from FIG. 5.

FIG. 2 shows two partition wall panels 10, which lie flat against a wall scaffold 5 or fastening flanges of the wall scaffold 5 and bear with their edge recesses 12 in a form-fitting manner on a mounting element 6. The mounting element 6 is cylindrical and welded into the wall structure 5 and has such a height that it projects with a head region 16 over the surface of the partition wall panels 10. With the head region 16, the mounting element 6 protrudes into an attached terminal strip 8, which has a complementarily designed receiving region 18. The partition plates 10 are fastened and clamped to the wall scaffold 5 with the aid of a fastening element 20 which is passed through a die hole 9 Terminal strip 8, through a fastening opening 7 of the mounting element 6 to the rear of the wall scaffold 5 and is secured and screwed there with a securing element 30, for example a hexagon nut.

A countersunk screw and especially a tear-off screw are used as the fastening element 20. In the present exemplary embodiment, this tear-off screw consists of a tear-off square 22 above a screw head 26, the tear-off square 22 ensuring that the screw connection can be tightened with a defined tightening torque. When the necessary tightening torque is reached, the square 22 breaks off. A conical transition 25 is formed between the screw head 26 and a screw shaft 27 with thread. This avoids a sharp-edged transition that could lead to voltage peaks.

2, 3 and 5 show a preferred embodiment of the terminal strips 8. These are rectangular in cross section with an upper trapezoidal region 14. In the present exemplary embodiment, the height of the clamping strips 8 corresponds approximately to the thickness of the partition wall plates 10. The inclined surfaces 19 on a trapezoidal area 14 of the clamping strips 8 cause the regrind and / or the grinding media in the adjacent grinding chamber to be rejected. It is advisable to produce the clamping strips 8, which due to their height can also take ground material and / or grinding media and act as lifting strips, from a wear-resistant material. The countersunk hole 9 formed in the terminal strips 8 is complementary to the screw head 26 and the conical transition 25 of the tear-off screw 20 and merges into a receiving area 18 for the head areas 16 of the mounting elements 6 on the wall structure 5.

In this exemplary embodiment, the mounting elements 6 are received and fixed, in particular welded, in alignment in appropriately designed openings in the wall structure 5 or the fastening flanges.

3 shows a clamping strip 8 in the region of the adjoining radial edge regions 11 of two partition wall plates 10. The same features are provided with identical reference numerals. 3 shows that the terminal strips 8 with bearing surfaces 28 rest on a relatively wide area of the two adjoining partition plates 10, so that a stable and secure attachment of the partition plates 10 is also given when surface areas of the partition plates 10, which are basically one Subject to wear and tear. However, since the terminal strips 8 counteract wear on the partition plates, a stable and complete hold is ensured over a particularly long period. Since particularly wear-resistant partition wall plates can be used due to the clamping bracket, the service life of a mill partition wall produced according to the invention is particularly long.

4 shows two fastening elements 20 which hold a clamping strip 8 and at the same time two radially adjacent partition wall plates 10 in a clamping bracket on a wall structure 5. As fastening elements 20, Tear screws used, the tear-off square 22 is still connected to the screw head 26. Hexagon nuts are used as securing elements 30. Both the mounting elements 6 and the terminal block 8 consist of a wear-resistant material.

5 shows the arrangement according to FIG. 2 in the exploded state. Identical features are again provided with identical reference symbols. A cylindrical mounting element 6 is welded into the wall scaffold 5 or a fastening flange of the wall scaffold 5, which protrudes in the assembled state with a head region 16 over the partition wall plates 10 and is received in a form-fitting manner in a receiving region 18 of the terminal strip 8.

The mounting elements 6 with their projecting head regions 16 act as locking elements for the clamping or lifting strips 8 to be fastened. The clamping effect of the clamping strips 8 can be determined by the height of the mounting elements 6. The dimensions of the mounting elements 6, the terminal strips 8 and the edge recesses 12 of the partition wall plates 10 are expediently coordinated with one another.

The die bores 9 in the terminal strips 8 are complementary to the fastening elements 20, in particular to the screw head 26 and to the conical transition 25 with screw shaft 27. The fastening element 20 is fixed with the aid of a hexagon nut as a securing element 30, which interacts with a washer 32.

The structure of the mill partition 2 of FIG. 6 basically corresponds to the partition 2 of FIG. 1. Identical features are provided with identical reference symbols. Instead of the radially arranged clamping strips 8, however, the partition panels 10 are fastened in the region of their circularly adjacent edge regions 31. The edge recesses 12 are therefore designed as semicircular recesses in the circular edge regions 31 and cooperate with clamping strips 38, which represent narrow circular ring segments and form a circular ring when the partition 2 is fully assembled. The circular strips 38 are also used in the area of the inner ring segment 3 and an outer ring segment 33 and the adjacent partition wall plates 10.

Figures 7 and 8 illustrate that the principle of the clamping bracket when using circular strips 38 as clamping elements 4 basically corresponds to that of the radially arranged clamping strips 8. A clamping strip 38 in the region of the adjoining circular edge regions 31 rests with contact surfaces 28 on the edge regions 31 of a middle ring segment 13 and an adjacent outer ring segment 23. The attachment takes place in the area of a wall scaffold 5 or in the area of attachment flanges of the wall scaffold 5 with the aid of a mounting element 6 which, in contrast to the first embodiment according to FIGS. 2 to 5, is attached to the wall scaffold. The bore 9 formed in the circular bar 38 as well as the fastening opening 7 in the mounting element 6 and a fastening opening 35 in the wall structure 5 are aligned and designed to receive a fastening element 20, preferably a tear-off screw.

Fig. 8 shows a longitudinal section through a circularly arranged terminal strip 38 and illustrates the arrangement of the Components of the clamping bracket in the area of the wall scaffold 5 with radially aligned fastening flanges for receiving and securing the fastening elements 20.

The clamping bracket shown schematically in FIGS. 9 and 9 uses point-acting clamping elements 4, which are referred to as clamping buttons 36. In the present exemplary embodiment, clamping buttons 36 are used, which have a square outline and, analogously to the clamping strips 8, 38, a receiving area 18 for a mounting element 6. The top view of a partition 2 according to FIG. 9 shows that the clamping buttons 36 are arranged in corner areas of the partition plates 10 of the outer ring segment 23. In these areas, the wall structure 5 has fastening flanges which are provided with an opening 35 for receiving a fastening element 20 (FIG. 10).

The clamping buttons 36 are demineralized in such a way that the adjacent three or even four partition wall plates 10 or inner ring segments 3 or outer ring segments 23 are covered and thus securely fastened. At the same time, protection of the partition wall panels 10 in the region of the edge recesses 12 is achieved.

Claims

PATENT CLAIMS 1. Mill partition, in particular transfer and discharge wall for tube mills, ball mills and the like, with partition plates (10), which are formed like a segment of a circle and attached to a diaphragm wall and / or a rear wall on a wall frame (5), characterized in that clamping elements (4) are arranged in the region of the adjoining partition wall panels (10) and the partition wall panels are fastened to the wall frame (5) in a clamping bracket. 2. Mill partition according to claim 1, characterized in that as clamping elements (4) terminal strips (8, 38) in a clamping arrangement on radial edge regions (11) and / or circular edge regions (31) of the adjoining partition plates (10) rest and with the help of a Fastening element (20) are attached to the wall structure (5). 3. mill partition according to claim 1, characterized in that the clamping elements (4) punctiform and as Clamping knobs (36) are formed which cover adjoining partition wall panels (10) in corner or edge areas (11, 31) and are fastened to the wall structure (5) with the aid of a fastening element (20). 4. Mill partition according to one of claims 1 to 3, characterized in that in or on the wall frame (5) mounting elements (6) are provided which have fastening openings (7), and that the adjoining partition plates (10) and ring segments (3, 23) have edge recesses (12) which fit in a clamped manner on the mounting element (6). 5. Mill partition according to claim 4, characterized in that the mounting elements (6), which are simultaneously provided for locking the partition plates (10), with a head region (16) over the adjacent partition plates (10) and that the clamping elements (4) have a receiving area (18) for the positive receiving of the head area (16) of the mounting element (6). 6. Mill partition according to one of the preceding claims, characterized in that the clamping elements (4) are provided with dies (9) which are complementary to the fastening elements (20), and that as fastening elements (20) tear-off screws are used, which with a securing element (30) are secured. 7. Mill partition according to one of claims 4 to 6, characterized in that the wall frame (5) is provided in the region of mounting flanges with the mounting elements (6), and that the mounting elements (6) are used in openings of the mounting flanges of the wall frame (5) or are placed and welded in the area of openings (35). 8. Mill partition according to one of claims 2, 4 to 7, characterized in that the clamping strips (8, 38) for flat support on the radial edge regions (11) or circular edge regions (31) of the partition plates (10) are formed and such Have height that they are suitable as lifting strips for grinding media and / or regrind. 9. mill partition according to one of claims 2, 4 to 8, characterized g e k e n n z e i c h n e t that the terminal strips (8, 38) are rectangular in cross section and are provided with an upper trapezoidal region (14). 10. Mill partition according to one of claims 3 to 7, characterized in that the clamping knobs (36) have a square, rectangular, round or polygonal plan and are rectangular in cross section. 11. Mill partition according to one of the preceding claims, characterized in that the clamping elements (4) consist of a wear-resistant one Material are made. 12. Mill partition according to one of the preceding claims, characterized in that the partition plates (10) consist of a material combination of a highly wear-resistant material and an unbreakable material. 13. Mill partition according to one of the preceding claims, characterized g e k e n n z e i c h n e t that the edge recesses (12) of the partition plates (10) are formed by burning out.