DE102018200176A1 - Connecting element for the articulated connection of a first machine part with a second machine part - Google Patents

Abstract

The invention relates to a connecting element (1) for the articulated connection of a first machine part (2) to a second machine part (3), so that the first machine part (2) is arranged to be movable relative to the second machine part (3) about an axis (a). wherein the connecting element (1) comprises a bolt (4) which passes through the one machine part (3) and which is fastened to the other machine part (2). In order to create a connection between the two machine parts, in particular in metallurgical plants, which is easy to solve even after long use in harsh environmental conditions, the invention provides that the bolt (4) has at least two flats lying opposite one another in its one axial end region , 6), which are connected to each other via a bore (7), wherein the one flat (5) on a planar contact surface (8) of the one machine part (2) is applied and wherein on the other flat (6) of the screw head (9 ) abuts a fastening screw (10) which passes through the bore (7) and a part of the other machine part (2) and is screwed to this.

Description

The invention relates to a connecting element for the articulated connection of a first machine part with a second machine part, so that the first machine part is movable relative to the second machine part about an axis, in particular pivotally, arranged, wherein the connecting element comprises a bolt which passes through a machine part and the is attached to the other machine part.

In the prior art generic fasteners are well known. In this case, a cylindrically formed bolt is usually pushed through a hole in a machine part; In the other machine part, two sections are often formed with respective bores in a fork-shaped designed component, so that the bolt can be pushed in alignment through the total of three bore sections to make the articulated connection between the two machine parts.

In most cases, the bolt is then secured in the arrangement against axial displacement, for example by an axle holder or a split pin, in order to prevent inadvertent release of the connection.

Especially in harsh environmental conditions, as are typical of metallurgical plants and in particular for rolling mills, occur when using the compounds mentioned problems. Here is particularly pointed to rolling mills, where a high scale attack occurs where high temperatures prevail and where lubricants and coolants are used. This has the consequence that the bolt connection can not be solved after some time. Exposed surfaces that are accessible to water and steam (in particular annular gaps), on the one hand subject to corrosion, on the other hand, it may also lead to cinder caking, so that the release of the connection is no longer possible without great effort. This results in particular from the fact that the compounds are often used in inaccessible places and therefore difficult to achieve with a suitable disassembly tool. As a result, the maintenance of the system or the removal of components is very difficult.

Another disadvantage is that in generic prior art bolt connections to ensure favorable installation conditions usually a certain amount of play is needed. If the bolt pushed through a total of three bore sections, it comes to the summation of the individual games, so that overall the installation clearance between the two machine parts is relatively high. Often, however, a seat with little play is advantageous. If the game becomes too large, the function of the connected components may be impaired. This occurs especially when a swelling or oscillating load takes place between the connected components. Here, for example, reference is made to piston-cylinder elements, where this is the case.

The invention has for its object to develop a connecting element of the type mentioned so that it is possible, especially when used in metallurgical plants, to be able to easily solve the fastener after prolonged use in harsh environments. In particular, a connecting element is sought, which creates a stable connection, which is not dependent on the material pairing. The connection should be easy to solve especially for maintenance purposes.

The solution of this problem by the invention is characterized in that the bolt has at least in its one axial end portion two opposing flats which are interconnected via a bore, wherein the one flat abuts a flat contact surface of a machine part and wherein at the another flattening of the screw head of a fastening screw is applied, which passes through the hole and a part of the other machine part and is screwed to this.

The bolt has preferably in its two axial end regions in each case two opposing flats, which are connected to each other via a bore. It preferably has a cylindrical section between its two axial end regions.

The term "articulated connection" in the sense of the present invention means that the interconnected via the articulated connection components can indeed be pivoted relative to each other, but not necessarily to each other must be pivoted. The linear movement of, for example, a cylinder does not necessarily mean a pivoting of the cylinder.

Between a nut, with which the fastening screw is fastened to the machine part, and the machine part, a sleeve is preferably arranged. This is in particular a burning sleeve; This can be easily removed by means of a welding torch.

The one machine part may have a particular L-shaped portion, wherein on the Section, in particular on the one leg of the section, the planar contact surface is arranged.

The machine parts are preferably part of a metallurgical plant. This is especially thought that the one machine part is part of a piston-cylinder element. This is in particular a piston rod and / or a cylinder housing. Preferably, a piston-cylinder element is fastened on both sides, ie both in the region of the piston rod and in the region of the cylinder housing, with the proposed connection to corresponding surrounding components.

The bolt of the proposed connection is therefore not completely executed round, but at least one side, preferably on both sides, flattened. This makes it possible to mount the bolt with a screw preferably including a burn-off. This compound can then be easily solved by burning by means of a welding torch. For re-assembly, only the screws and burn-off sleeves need to be replaced. New bolts are not required.

The proposed concept thus provides a robust bolt connection which can be advantageously used in a harsh environment, in particular in a rolling mill.

It is advantageous that the described connection can be solved relatively easily and with little effort for maintenance purposes.

The proposed concept is particularly preferred for use where the bolt is loaded in one direction only and thereby the screw can be designed so that it has to absorb only a small load.

The bolt has one degree of freedom less than usual; As a result, the relative movement in the bolt connection can be defined, similar to an axle holder. In conventional construction, an axle holder or a similar securing element is additionally required. In the case of the axle holder, however, this requires a mounting with play, which therefore allows a slight movement about the axis of the bolt. The proposed solution does not require this advantageous.

Overall, advantageously results in a lower overall game than in the previously known solutions.

Preferred fields of application of the proposed connecting element are rolling mills and here in particular hot rolling mills, where typically a high scale accumulation occurs where high temperatures prevail and where lubricants and coolants are used, ie a generally corrosive, steam-laden environment prevails.

• 1 die Seitenansicht eines Teils einer hüttentechnischen Anlage mit einem Verbindungselement, mittels dem ein Gehäuse eines Kolben-Zylinder-Elements an einem Teil der Anlage befestigt ist,
• 2 in perspektivischer Darstellung die Anordnung nach 1 und
• 3 in perspektivischer Darstellung einen Bolzen des Verbindungselements.

In the drawing, an embodiment of the invention is shown. Show it:

• 1 the side view of a part of a metallurgical plant with a connecting element, by means of which a housing of a piston-cylinder element is attached to a part of the system,
• 2 in a perspective view of the arrangement 1 and
• 3 in perspective view a bolt of the connecting element.

In the 1 and 2 is a connecting element 1 to see, which connects a first machine part (support member) with a second machine part in the form of the cylinder housing of a piston-cylinder element. The connection is articulated, ie the two machine parts 2 and 3 can be relative to each other around the axis a (in the 1 perpendicular to the drawing plane) Pivoting. This is a bolt 4 used that - as it is best 2 it can be seen - the second machine part 3 interspersed and the with its two axial end portions on the first machine part 2 is attached.

The design of the bolt is best 3 , After that, the bolt points 4 in its two axial end portions flats 5 and 6 on, which are opposite each other, ie form parallel surfaces. The area of flattening 5 . 6 is over a hole 7 connected with each other. Between the two axial end portions, the bolt 4 a cylindrical section 11 on.

At the first machine part 2 is a contact surface 8th formed like the flattenings 5 and 6 of the bolt 4 is just. Accordingly, the bolt 4 with its two flattenings 5 in its two axial end portions of corresponding contact surfaces 8th of the first machine part 2 be created.

The attachment of the bolt 4 and thus also the second machine part 3 on the first machine part 2 done with two fixing screws 10 , The screw head 9 the fixing screw 10 lies in the flattening 6 of the bolt 4 on; the fixing screw 10 then passes through the hole 9 and another (not shown) bore in the first machine part 2 to then with its threaded portion from the first machine part 2 Leave where the fixing screw 10 with a mother 12 is fixed. How to recognize, however, is between the first machine part 2 and the mother 12 still a burning sleeve 13 mounted, which can be easily removed later by means of a cutting torch to release the connection again.

When mounting the two mounting screws accordingly 10 with the nuts 12 attached, leaving the flattening 5 firmly on the contact surface 8th is applied.

Later during disassembly can then the burning sleeve 13 be easily removed by means of a cutting torch to separate the individual parts of the compound from each other.

Thus, a lightweight, rolling mill-appropriate release of the connecting element by burning the combustion sleeve by means of a welding torch is possible, resulting in better determinable maintenance periods or downtime.

A further advantage is a play-free seat of the bolt, at least on one of the two machine parts to be joined.

The structure of the proposed connection is very simple and therefore inexpensive.

Although corrosion effects remain, they no longer have such a negative effect as with previously known solutions. In particular, there is no crevice corrosion, as a flat surface of the bolt is pressed onto a flat counter surface of the other component.

The proposed connecting element is specially tailored to the environmental conditions prevailing in a rolling mill, in particular in a hot rolling mill. They are not prone to harsh conditions and especially to aggressive water, heat, rust, caking and scale.

Furthermore, the connection is well suited for transmitting large forces (if they only act in one direction).

Thus, the proposed fastener optimizes the rolling process, as it helps to reduce downtime during maintenance or repair. In previously known solutions this is much more complicated than in the proposed concept. This applies in particular to the aspect that the compounds in question are often located in very inaccessible places. There is then not the space to use larger disassembly tools.

The release of the compound using the proposed connecting element can be done in a simple manner by burning the Abbrennhülse, which is easily possible with the aid of a cutting torch. Even hard to reach places can thus be easily reached and the connection can be solved in a simple manner.

LIST OF REFERENCE NUMBERS

1

connecting element

2

first machine part (carrier element)

3

second machine part (piston rod / cylinder housing)

4

bolt

5

flattening

6

flattening

7

drilling

8th

contact surface

9

screw head

10

fixing screw

11

cylindrical section of the bolt

12

mother

13

Sleeve (burning sleeve)

a

axis

Claims (10)

Connecting element (1) for the articulated connection of a first machine part (2) with a second machine part (3), so that the first machine part (2) relative to the second machine part (3) about an axis (a) is movable, in particular pivotable, arranged wherein the connecting element (1) comprises a bolt (4) which passes through the one machine part (3) and which is fastened to the other machine part (2), characterized in that the bolt (4) at least in its one axial end region two opposite one another Flats (5, 6), which are connected to each other via a bore (7), wherein the one flat (5) on a flat contact surface (8) of the one machine part (2) is applied and wherein on the other flat (6) of the Screw head (9) of a fastening screw (10) is applied, which passes through the bore (7) and a part of the other machine part (2) and is screwed to this. Connecting element after Claim 1 , characterized in that the bolt (4) in its two axial end regions in each case two opposing flats (5, 6), which are connected to each other via a bore (7). Connecting element after Claim 2 , characterized in that the bolt (4) between has a cylindrical portion (11) at its two axial end portions. Connecting element according to one of Claims 1 to 3 , characterized in that between a nut (12) with which the fastening screw (10) on the machine part (2) is fixed, and the machine part (2) has a sleeve (13) is arranged. Connecting element after Claim 4 , characterized in that the sleeve (13) is a burn-off sleeve. Connecting element according to one of Claims 1 to 5 , characterized in that the one machine part (2) has a particular L-shaped portion, wherein on the portion, in particular on the one leg of the portion, the planar contact surface (8) is arranged. Connecting element according to one of Claims 1 to 6 , characterized in that the machine parts (2, 3) are part of a metallurgical plant. Connecting element after Claim 7 , characterized in that the one machine part (3) is part of a piston-cylinder element. Connecting element after Claim 8 , characterized in that the one machine part (3) is a piston rod. Connecting element after Claim 8 , characterized in that the one machine part (3) is a cylinder housing.

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