DE9316427U1 - Swivel device for a scraper - Google Patents

Description

Swivel device for a scraper

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

As is well known, stripping or scraping devices on rolling mills are necessary to ensure a consistent and satisfactory rolling result. As a rule, two scrapers are present on a rolling mill (pair of rollers), which are conveniently located in the running direction of the rollers immediately behind the roller gap, whereby the scrapers are often installed below (horizontally arranged) rollers in order to allow stripped material to fall freely onto a material removal belt for further processing, disposal, etc. The positioning of the scrapers against the rollers to be cleaned is usually carried out mechanically or pneumatically.

72554

Bremen:

Hollcrailee 32, Bremen

PO Box 10 71 27, D-28071 Bremen

Telephone (0421) 34090
Fax (04 21) 3 49 17 68
Telex 244 958bopatd

Berlin:

Uhlandstrasse 1 73/174 D-10719 Berlin

Telephone (0 30)8.$! 10.3/l. Fax (0 30)»8 81.39 27 . Telex 183 6il.fio}iod*.

Munich:

Franz-Joscph-Straßc 38
D-KOKOl Munich

Telephone (0 89) 34 70 80
Fax I (0 89)*3*4.7<ff(l* '.
fcVx. :.$24 282.1*^(1«

Leipzig:

Petersstraße 2&eeacgr; D-(Ml(K) Leipzig

Telephone (03 41)29 45 Fax (03 41)28 40

Dusseldorf:

Neßlerstrasse D40593 Düsseldorf

Telephone (0211) 718983 Fax (02 11)7 18 27

BOEHMERT & BCEHMERT? NORDBMANN and PARTNER

Replacing the scrapers that are subject to wear has so far been difficult, time-consuming and dangerous, as access to the space between the rolling mill and the material discharge belt is very limited and requires the worker to adopt an extremely unergonomic posture. Scraper devices are known that circumvent this difficulty by allowing the scrapers to be removed manually from the machine level and then serviced. However, these devices have the disadvantage that they require considerable force to remove the relatively heavy scrapers.

The object of the present invention is to create a scraper device of the type mentioned, while avoiding the above-mentioned and other disadvantages, in which the scrapers to be maintained or replaced can be brought quickly, safely and without any human effort from the machine into an easily accessible maintenance position, from which they can be brought back into the operating position after the maintenance work has been carried out.

This object is achieved according to the invention by claim 1.

Preferably, a control system for two swivel drives is provided, with which two scrapers on a pair of rollers forming a roller gap can be swiveled either independently of one another or simultaneously and in the same way.

It is expedient to use two (two in each case) drive elements that optionally exert a tensile or compressive force and act on a linkage that is operatively connected to the scraper, one of which is a swivel drive element and one is an auxiliary drive element, with the lines of action of the drive elements

BOEHMERT &^# BQEHMER*S, SiORpEM&NN and PARTNERS

run in pairs essentially perpendicular to each other and perpendicular to the pivot axes.

A particularly preferred embodiment has a common auxiliary drive element for two scrapers on a pair of rollers, whereby both a joint and an independent pivoting of the two scrapers of a pair of scrapers is possible in the simplest way.

Further advantages of the invention are described in the subclaims.

The invention is described in more detail below by way of example using a preferred embodiment with reference to a drawing, in which

Fig. 1 is a plan view of the pivoting device according to the invention in the direction of the pivot axes, and

Fig. 2 is a side view of the device of Fig. 1.

As can be seen from Figure 1, the scrapers, designated as a whole by 1, serve to clean or strip the rollers 3 rotating in the direction of the arrows 2. For this purpose, scraper tools or blades 5 are held on the scraper arms 4, which rest on the cylindrical surface of the rollers 3. The scraper tools 5 extend (perpendicular to the plane of the illustration in Figure 1) in the desired length, i.e. generally over the entire length of the rollers 3, with the scraper arms 4 being arranged at the end sections of the scraper tools 5, resulting in a U-shaped structure of the scrapers 1. Scraped material essentially falls between the scrapers 1 onto a material removal belt 6, which rotates below the arrangement between two tension rollers 6a.

BOEHMERT & BOEHiWERTj NORDKMANN and PARTNER

As can be seen from Figure 1, the scrapers 1 can be pivoted about pivot axes 7 running parallel to the rotation axes of the rollers 3, whereby they can be pivoted from the operating position 8 into a maintenance position 9 in which the scraper tools 5 are easily accessible. The axes 7 or the required bearings are stationary in relation to the machine frame 10 of the scraper device.

To clarify the mounting of the scrapers in the machine frame 10, reference is made to Figure 2, which shows the U-shaped structure of a scraper with two scraper arms 4 and the scraper tool 5 in a side view, whereby the scraper can pivot about the fixed axis 7.

The swivel drive of the scrapers consists initially of two hydraulic cylinders 11, each of which acts on the scraper arms 14 between a support point 12 that is fixed in relation to the machine frame 10 and a linkage 13. The drive also comprises an auxiliary cylinder 4, which acts between the two scrapers and is connected at one end to a hydraulic cylinder 11 via the linkage 15, whereby here too there are a total of two auxiliary cylinders 14 - one at each end section of the scraper arrangement or next to two adjacent scraper arms 4 - as can also be seen from Fig. 2. In Fig. 2 it can also be seen that the drive elements 11 and 14 are mounted outside the U-shaped scraper edge arrangement 4, 5 so that the scraper can be swiveled by approximately 180° without hitting anything. For this purpose, the linkage 13 of the hydraulic cylinders 11 on the scraper arms 4 each has a pin 13a.

In order to move the scrapers 1 from the working position 8 shown in solid lines in Figure 1 to the maintenance position 9 shown in dashed lines, the piston rods of the

BOEHMERT &*BQEHMERT3;rSORDSM&NN and PARTNERS &bull; · · · « · · ■·· ·

Hydraulic cylinders 11 are retracted. Since, as explained, the swivel axes 7 and the support points 12 are stationary, the scrapers 1 thereby perform a circular swivel movement around the swivel axes 7. When the lower dead center is reached, i.e. when the linkages 13 in the plan view according to Figure 1 are in line with the support points 12 and the swivel axes 7, the auxiliary cylinders 14 are actuated in such a way that a pressure force is exerted and thus move the scrapers past the dead center further in the direction of the maintenance position 9. As soon as the dead center is exceeded, the hydraulic cylinders 11 are also pressurized, with the cylinders 11 and 14 now working together to push the scrapers completely into the maintenance position 9. In this position or even beforehand, the auxiliary cylinder 14 can be depressurized.

After the necessary maintenance work has been carried out, the piston rods of the hydraulic cylinders 11 are first retracted until the scrapers are again in the dead center position. In this position, the auxiliary cylinders 14 are actuated in such a way that a pulling force is exerted and the dead center is overcome, after which the hydraulic cylinders 11 are again pressurized in order to bring the scrapers back to their working position 8. The auxiliary cylinders 14 can also be depressurized in this position. It should be noted that the weight of the scrapers is usually sufficient to carry out the respective downward movements, so that the hydraulic cylinders, unlike the auxiliary cylinder 14, do not have to be double-acting.

With appropriate control of the individual hydraulic cylinders, it is of course also possible to swing out or service an individual scraper, for example in Figure 1, by keeping the hydraulic cylinders 11 on the left side under pressure and thus in the working position,

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BOEHMERT ^BQEiiMER ¹ ?, NOflDjpM^NtN and PARTNERS

while only the hydraulic cylinders 11 on the right side are operated together with the auxiliary cylinder 14 in the manner described above in order to be able to service the scraper on the right side.

Claims (10)

1. Device for moving a scraper relative to a roller of a rolling mill with at least two rollers, which is to be scraped by the scraper, in particular on rolling mills for the ceramic processing of clays or similar masses, between an operating position and a maintenance position, characterized in that the scraper (1) is moved by a drive arrangement with a pivot drive (11, 14) from the operating position (8) by a distance relative to the axis of rotation of the roller (3) parallel, stationary swivel axis (7) is swiveled into an easily accessible maintenance position (9) away from the roller gap. 2. Device according to claim 1, characterized by a control for two swivel drives for swiveling 72554 Bremen: Holleralice 32, Bremen PO Box 10 71 27, D-28071 Bremen Telephone (0421) 34090
Fax (04 21)3 49 17 68
Telex 244 958 bopat d Berlin: Uhlandstrasse 173/174
D-!0719 Berlin Munich: Franz-Joseph-Str. 3X D-80801 Munich Telephone (0 .^S^iIiGTSJ J <ft!cj*on (0 SM UiVm Telefax (O X) B«l 39&euro;7 . iT*lcfJx , (tf 89) }4 7<)J<! Telex !83 66! Wo dj JJ &Tgr;&phgr;&iacgr;····524 *2 fo*od Leipzig: Pctcrsssraße 26 D-04109 Leipzig Telephone (03 41)29 45 Fax (U3 4!) 28 40 Dusseldorf: Neßlerstrasse D-40593 Düsseldorf Telephone Fax (0211) 718983 (0211)71827 BOEHMERT &&Bgr;&thgr;&Kgr;&xgr;&Igr;&Mgr;^&Kgr;&Tgr;, HOflf*EM^N*yto PARTNER two scrapers (1) on a pair of rollers forming a roller gap (3, 3) either independently of one another or simultaneously and in the same way. 3. Device according to claim 1 or 2, characterized by two (two in each case) drive elements (11, 14) which optionally exert a tensile or compressive force and act on a linkage (13) operatively connected to the scraper (1), one of which is a pivot drive element (11) and one is an auxiliary drive element (14), the lines of action of the drive elements (11, 14) running in pairs essentially perpendicular to one another and perpendicular to the pivot axes (7). 4. Device according to claim 3, characterized in that the drive elements (11, 14) are hydraulic or pneumatic cylinders. 5. Device according to one of the preceding claims, characterized in that the articulation (13) is located axially outside the longitudinal extension of the scraper (1). 6. Device according to one of the preceding claims, characterized in that the scraper(s) (1) (each) has a scraper tool (5) running parallel to the axis of rotation of the rollers (3), which is held at its opposite ends by a scraper arm (4) mounted on the pivot axis (7). 7. Device according to one of claims 3 to 6, characterized in that drive elements (11, 14) are present in the axial direction on both sides of the scraper(s) (1). BOEHMERT & BOE^M^T, ^ORDjEM^fiN*y?iD PARTNER 8. Device according to one of claims 3 to 7, characterized in that the auxiliary drive element (14) is articulated at a point of the swivel drive element (11) which lies between the articulation (13) and a stationary support point (12) of the swivel drive element (11). 9. Device according to one of claims 3 to 8, characterized in that the pivot drive elements (11) are arranged symmetrically to the plane of symmetry of the roller pair (3, 3). 10. Device according to one of claims 3 to 9, characterized by a common auxiliary drive element (14) for two scrapers (1) on a pair of rollers (3, 3)