KR20160095109A - Sealing arrangement for radially loaded round guides - Google Patents

Abstract

A guide or piston rod (10) is supported in an at least one guide bushing (13) so as to be movable in an axial direction, and a guide or a piston rod 10 is assigned as a sealing means a stripping device 18 which is provided axially adjacent to the end face of the guide bushing 13 and which stripping device is in particular a ring blank press or a radial / And is provided for transferring the mechanical member in the molding machine. In the case of the above-described sealing apparatus, improved sealing should be possible even when the rigidity and rigidity of the stripping apparatus is increased even when the wear of the guide bushings is increased. This is because the stripping device 18 is made of a non-elastic material and has a radius (not shown) inside the groove 15 which is formed in such a manner as to extend along the outer circumference on or in the structural member 7 which houses the guide or piston rod 10 And is arranged with a directional movement clearance.

Description

Technical Field [0001] The present invention relates to a sealing device for a radial load-

The present invention relates to a sealing device for a radial load-bearing circular guide, wherein a guide or a piston rod is movably supported in at least one guide bushing in an axial direction, the guide rod is provided with sealing means A stripping device is provided which is axially adjacently provided on its side and which stripping device is particularly suitable for use in a molding machine such as a ring blank press or a radial-axial rolling machine And is provided for transporting the mechanical member.

A ring mill or a radial / axial mill or ring blank press is a molding machine for shaping a seamless ring with an intended cross-section through rolling or pressing the blanks and radially expanding them.

The ring rolling machine as known for example from DE 29 17 369 A1 usually comprises at least one main rolling roll acting on the ring outer surface while being driven and one mandrel roll acting on the ring inner surface. On the ring end faces there may be two axial rolls, one on the upper axial roll and one on the lower axial roll.

In principle, ring mills which have been known for a long time include mandrel roll carriages and centering tables for ring blanks that can be transported across the guide rods and a stationary frame containing the main rolling rolls to be driven And a transportable axial stand including an upper axial roll and an lower axial roll which are adjustable within a radial stand and an axial carriage that receive the air.

There are provided four guide rods each having two sealing positions spaced apart from each other for transporting a mandrel roll carriage of at least one of the guide rods which can be transported in the hydraulically pressurized manner so as to have a total of eight sealing positions, And is movably supported axially within the guide bushings of the machine frame, the guide bushings being disposed in a stationary structural member of the machine frame.

The bearing positions of the guide bushings and the corresponding guide rods are protected from contamination by the stripping devices as sealing means towards the outside. In this case, the stripping devices that are seated on the surface or guide rods to be sealed are mounted coaxially with respect to the guide bushings in the frame of the ring rolling mill, or in the covers which can be connected to the frame separately.

The guide bushes which carry the support of the guide rods receive a load in the radial direction during the transport of the guide rods. In this case, there is usually a wear which acts on the partial circumference of one side abrasion or guide bushing, which is related to the inner surface of the guide bushings and to the inner surface of the stripping devices concentrically surrounding the guide rods Thereby causing the eccentric position of the guide rods.

Accordingly, for example, even in the case of the polygonal guide rod, the center displacement of the corresponding circular guide is generated through simultaneous lateral force during the axial movement. This lateral force occurs through magnetic weight, additional mass connected and / or forces due to machining or molding processes. This is the case in the case of cylinders on a mobile hydraulic system, such as a wheel loader or a mobile crane, which occurs through virtually any cylinder position where a lateral force may exist due to the function. It also occurs in the case of compact cylinders used to support or engage the heaviest structural members for field mounting. The cylinders usually have a very inadequate guide behavior due to their mounting heights. In addition, the structural members are often only incorrectly fixed and guided during mounting, which causes radial offset of the piston rod.

In the case of a radial / axial mill, the guide rods of the guide carriages for scale removal are likewise insufficiently supported on the machine, in addition to the mandrel roll carriages already mentioned. During vertical stroke for scale removal, the axial stand is lowered to the full ring height (up to 4 m). At the same time, the effluent produces a moment or a lateral force acting on the guide rods above the guide carriages, for example at a pressure of 250 bar and 400 l / min.

Stripping devices made of soft and elastic materials can follow said center displacement of a guide or piston rod within a predetermined limit. However, these types of materials, which additionally wear relatively fast and thus only allow a short useful life, are not suitable for sealing systems of circular guides subjected to high radial loads.

The higher the hardness of the stripping device material and the resulting abrasion resistance, the further the tendency of the material to follow the eccentric displacement of the guide or piston rod and hence the sealing surface. If the elastic limit of the stripping device material is reached and as a result the lateral displacement caused by the wear of the guide bushing further increases, the stripping device is lifted from the guide or piston rod on the load relieved surface or on the partial radius, Contaminant particles can penetrate into the gap between the guide bushing and the rod without interfering.

Therefore, in particular in the case of a ring mill or ring blank press, due to the rough operating conditions, only stripping devices which are very rigid and composed of a material which is rigid and therefore only slightly elastic is used. Soft and resilient stripping devices can wear out extremely quickly and are only exchanged at high cost due to the mounting location.

It is therefore an object of the present invention to provide a circular guide which is subjected to a very high radial load so that the abovementioned disadvantages are avoided and improved sealing is achieved even when the wear of the guide bushings is increased even with the use of very rigid and rigid stripping devices And to provide a sealing apparatus.

This object is achieved according to the invention in that the stripping device is made of a non-elastic material and is arranged in a groove which is formed in such a way as to extend along the periphery on or in a structural member which houses a guide or piston rod, . In the event of unilateral or partial wear on the inner circumferential surface of the guide bushings and concomitant with this, an eccentric guide or position of the guide or piston rods takes place in relation to the inner circumferential surface of the guide bushing, the stripping device is based on radial displacement within the groove Following the center displacement, whereby the stripping device can be centered on the guide or piston rod while always sealing the guide or piston rod in a gastight manner. At the same time, in conjunction therewith, the guide bushings are already protected from abrasion from the beginning immediately.

Stripping devices which effectively prevent the penetration of contaminants between the guide bushings and the rods during axial displacement of the guide rods from the carriages on the ring mill, or during axial displacement of the piston rods from the cylinders, For example, with a sealing lip or sealing edge that is neatly cut towards a guide or piston rod and is widely seated on the guide or piston rod. Due to the radial free space or moving clearance, the stripping device can in any case be constructed of a material that is extremely rigid, rigid and thus inelastic.

The hardness of the elastically deformable stripping device material can be selected substantially freely because for critical seating of the stripping device on the guide rod a critically important thing is to follow the center displacement of the guide or piston rod Because of the radial displacement of the stripping device, not the tendency of the material.

 According to a preferred embodiment of the present invention, there is provided a support ring concentrically surrounding a stripping device formed with a sealing ring embedded in at least one ring end face. Permanent sealing of the guide bushing or bearing position is achieved through the sealing which is embedded in the ring end face, that is to say on the wall portion of the groove which is closely and continuously directed towards itself, irrespective of radial mobility or displacement . In this case, the stripping device itself can be maintained with no change with respect to its application specific construction, so that conventional types can also be used, since the end face sealing is a complementary part, In other words, it is embedded in the support ring. In this case, it suffices that the support ring is fitted only above the stripping device before being mounted into the groove of the machine frame or the cylinder housing. Optionally, the stripping device and the support ring may also be provided or formed as an integral mounting component, for example, via an adhesive bond or the like.

In the case of combining the support ring with the optionally formed stripping device, it suffices that only a sufficient radial free space with moving clearance for the satellite of the stripping device / support ring unit in the interior of the groove is to be ensured for the compensation of the center displacement.

The stripping device / support ring unit is disposed coaxially in the groove with respect to the guide or piston rod and the stripping device is seated on its outer surface with a sealing surface of its own or with the piston rod, Spaced radially spaced from the recessed end of the extending groove.

According to a further embodiment of the invention, the internal width between the wall portions of the groove extending along the periphery is greater than the width of the support ring, and the sealing is seated on one wall portion of the wall portions. In this case, the groove width is preferably larger by a few tenths of a millimeter than the width of the support ring, in order to enable a relatively easier radial translation of the support ring in the groove extending along the periphery . Nevertheless, it is effectively prevented that the dirt or contaminants can penetrate through the sealing, preferably the O-ring, embedded in the recess of the ring end face. This is assisted again by the fact that the O-ring sealing is rested on the opposing grooved wall portion with a slight preload.

Additional features and details of the present invention will become apparent from the appended claims and from the description of the embodiments of the invention shown in the drawings with reference to a mandrel roll carriage used in a radial / axial rolling mill or ring rolling mill, ≪ / RTI >

According to the present invention, there is provided a sealing apparatus for a radial load-bearing circular guide in which disadvantages of the prior art are solved.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an overall view showing a ring rolling mill including a transportable axial stand and a radial stand transportable over guide rods.
Fig. 2 is a partial view showing a circle indicated by a dotted line in a sealing device for a guide rod for conveying a mandrel roll carriage as a detail part of Fig. 1;

In Fig. 1, the ring rolling mill 1 is shown in relation to its basic configuration. The ring rolling mill 1 is used for the production of a seamless ring which is rolled from the ring blank 2.

The ring rolling mill 1 includes a main rolling roll 3, a mandrel roll 4, an upper cone roll 5 and a lower conical roll 6. The main rolling roll 3 acts on the outer surface of the ring, while the mandrel roll 4, which is also referred to as a roll mandrel, acts on the inner surface of the ring. The cone rolls 5, 6 act on the ring end surfaces. An axial roll gap is formed between the conical rolls. The conical rolls 5, 6 are therefore also referred to as axial rolls.

The main rolling roll 3 and the mandrel roll 4 form a first roll pair while the conical roll 5 and the conical roll 6 form a second roll pair and at least one each of the roll pairs Is driven.

The main rolling roll 3 is positioned and disposed within the frame or machine frame 7 of the radial stand 8 of the ring rolling mill 1 while the centering rolls 4 for the mandrel roll 4 and ring blank 2 The table 9 is received by a mandrel roll carriage 11 which can be transported across the guide rods 10.

At a position horizontally opposite the radial stand 8, the ring rolling mill 1 includes a transportable axial stand 12 having an upper conical roll 5 and a lower conical roll 6.

A total of four guide rods 10 are provided in the position-fixing structural members of the radial stand 8 or the machine frame 7, and the upper and lower guide rods 10, The lower guide rods 10 are positioned opposite to each other by a pair.

In Fig. 2, a sealing device for one of the guide rods 10 is shown in an enlarged view.

The guide rod 10 is movably supported in the axial direction (the arrow direction 14) in the two guide bushings 13 that are disposed apart from each other in the machine frame 7 of the ring rolling mill 1, The guide bushing 13 of the lower guide rod 10, which is indicated by a circle of one-dot chain line in Fig. 1, is shown.

On the machine frame 7 there are also grooves 15 extending along the circumference concentrically around the guide rod 10 in a manner axially adjacent to the outer end faces for each guide bushing 13. [ Is formed. The groove 15 receives a support ring 16 which includes a stripping device 18 concentrically surrounded by its inner ring surface 17. [ The mounting height of the support ring 16 including the stripping device 18 which is hermetically seated on the guide rod 10 is lower than the height of the groove 15 extending along the outer periphery, Between the ring outer surface 19 and the recessed end 20 of the groove 15 is formed a radial free space 21 in which the support ring 16, including the stripping device 18, To have a moving clearance for displacement.

The axial movement of the guide rods 10 required during machine operation causes one or both of the wear of the guide bushings 13 and hence the eccentric guide or position of the guide rods 10 relative to the inner circumferential surface of the guide bushings 13. [ do. However, since the support ring 16, including the stripping device 18, follows the center displacement of the guide rod 10 on the basis of the radial variable within the groove 15, the stripping device 18 spontaneously guides Can be centered on the rod (10) and can always be airtightly extended in a manner extending along the outer periphery of the guide rod.

The inner width between the wall portions 22 and 23 of the groove 15 is greater than the inner width between the wall portions 22 and 23 of the groove 15 in order to promote the relatively easier radial positioning of the support ring 16 within the groove 15 extending along the periphery. (16) by a few tens of millimeters.

For ease of access when mounting the stripping device 18 and the support ring 16 in the machine frame 7 and especially in the machine frame 7 the wall portion 23 located outside the groove 15 is screwed Member.

Finally, the support ring 16 is preferably formed as an O-ring and has a seal 24 that is embedded in the inner ring end face, which seal is attached to the wall 22 located inside the groove 15 So that the dirt or contaminants can not reach the guide bushings 13 despite the radial displacements.

1: ring rolling mill
2: Ring Blank
3: main rolling roll
4: mandrel roll
5: upper conical roll
6: Lower cone roll
7: Machine frame or structural member for receiving guide or piston rod
8: Radial stand
9: Centering Table
10: Guide rod
11: mandrel roll carriage
12: Axial stand
13: Guide bushing
14: Arrow
15: Groove
16: Support ring
17: inside the ring
18: Stripping device
19: Outside the ring
20: recess end
21: Radial free space part
22: wall portion
23: wall portion
24: Sealing

Claims (3)

Wherein the guide or piston rod (10) is movably supported in the at least one guide bushing (13) in the axial direction and the guide or piston rod (10) is provided with a seal As a means, a stripping device 18 is provided which is provided axially adjacent to the end face of the guide bushing 13, which strips the machine member in a molding machine, in particular a ring blank press or a radial / The sealing device as claimed in claim 1,
The stripping device 18 is constructed of a non-elastic material and has a radius 15 formed inside the groove 15 formed in such a manner as to extend along the outer circumference on or in the structural member 7 which houses the guide or piston rod 10 And the radial load-carrying type circular guide sealing device is disposed with a directional movement clearance. 2. A radial load carrying circular guide (1) according to claim 1, characterized by a support ring (16) formed with a sealing ring (24) embedded in at least one ring end face concentrically surrounding the stripping device . 3. A method according to claim 2 wherein the inner width between the wall portions (22, 23) of the groove (15) extending along the outer periphery is significantly greater than the width of the support ring (16) Is mounted on a wall of one of the wall portions (22, 23).

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