DE202014102026U1 - Arrangement for closing bores - Google Patents

Abstract

Borehole closure device (1, 17, 23) for attachment in, in particular for covering boreholes (2) in machine components (8), comprising a closure plug (11, 18, 27), a Andruckausübungsabschnitt (14, 22, 28) and a radially outside the Andruckausübungsabschnitts (14, 22, 28) arranged clamping ring (10, 19, 25), characterized in that the clamping ring (10, 19, 25) is formed radially continuous and has an elastically deformable material.

Description

The invention relates to a borehole closure device for fastening in boreholes in machine components, preferably for covering boreholes in machine components, wherein the borehole closure device has a closure stopper, a pressure application section and a clamping ring arranged radially outside the pressure application section.

For machines, the presence of boreholes is common practice. Such holes serve different purposes. As an example among many, holes are provided to make room for receiving screws. With the help of the screws, in turn, the components concerned can be easily fixed to other components with high pressure forces and reversibly. Purely by way of example, plate-like or rail-like elements are to be mentioned in this context, which are to be fastened to a wall or to a machine surface.

A disadvantage of such boreholes is that objects, in particular also dirt, chips, in some cases even larger particles, can penetrate into the openings. It is particularly problematic if the chips or particles in question partially project beyond the actual borehole.

A typical example that should serve to illustrate the above problem is a linear guide carriage for use in machine tools. In this environment, the occurrence of metal shavings due to the function is almost inevitable. Now, if metal shavings enter the borehole and partly protrude beyond and a carriage moves along the linear guide, such a metal chip can cause jamming of the carriage, which can lead to a standstill of the machine tool and which accordingly leads to production losses. It is even more problematical that damage to the linear guides and / or the carriages can occur at the not very high machine speeds in machine tools, which leads to corresponding repair costs (paired with the corresponding downtime associated with the then required repair).

To avoid such problems, sealing plugs are used as standard, which can be used in boreholes (for example in the mounting holes of linear guides) and which should create as level and flat a surface as possible with the surrounding surface areas of the workpiece around the borehole.

The underlying task is less trivial, especially in some applications (such as in particular in connection with machines, especially machine tools), as it first appears. Because the surface quality should be on the one hand as long as possible of high quality, which requires that the sealing plug stuck with a high holding force in the holes.

Furthermore, the plugs should be as easy to assemble and beyond also be disassembled (this should be as simple as possible). Of course, the cost aspects also play a certain role in this context. In particular, the required high pressure forces require a certain excess of the sealing plug relative to the wellbore. On the other hand, if the excess is too large, this can lead to warping of the sealing plug, with the effect that it protrudes from the flat surface like a "hill". Accordingly, small tolerances must therefore be observed.

To solve this quite problematic requirement profile different solutions were made in the prior art. In the German publication DE-OS 30 46 590 It was proposed to first bring the sealing plug to a temperature below room temperature, then insert it into the bore and fix the sealing plugs by the subsequent thermal expansion in the borehole. However, the assembly is complicated and time-consuming due to the necessary cooling and warm-up procedures.

In the German utility model DE 93 16 349 U1 It is proposed to provide each sealing plug with a concentric pin, which extends in the assembled state partially into an internal polygonal profile of a screw head. The fixing of the sealing plug takes place in that the remaining cavity of the internal polygonal profile of the screw is filled with a casting resin. Although this method allows an excellent fixation of the sealing plug, but is very complex due to the need for pouring with the casting resin, especially time-consuming. In addition, removal of the plug is relatively problematic.

In the European patent application EP 0803656 has been proposed an arrangement for closing holes in guide rails, wherein the sealing plug have a disc-shaped upper part, projects from which a concentric pin. To attach this plug in the borehole is first an annular clamping disc, the at a circumferential point one having continuous radial slot disposed in the bore. By pressing the pin of the sealing plug into the clamping disk, the radial slot of the clamping disk is widened and thereby the clamping disk and the pin are pressed in the borehole. In this way, a flat surface can be created by means of the disc-shaped upper part. However, the radial slot of the clamping disk proves to be problematic, since liquids and finer dirt particles can reach the screw through them. On the other hand, the sealing plug prevents easy cleaning of the borehole areas. Especially with more aggressive penetrating materials, this can lead to a relatively rapid corrosion, which is naturally undesirable.

The object of the present invention is therefore to propose a borehole closure device for mounting in boreholes in machine components, which is improved over borehole sealing devices, as known in the prior art.

The present invention solves this problem.

It is proposed to further develop a borehole closure device for fastening in boreholes in machine components which has a closure stopper, a pressure application section and a clamping ring arranged radially outside the pressure application section such that the closure ring is designed to be radially continuous and has an elastically deformable material. The borehole closure device can serve in particular for covering boreholes in machine components. In other words, in the assembled state, the clamping ring is located between the inner wall of the borehole and the Andruckausübungsabschnitt, where it is usually trapped frictionally. Of course, the wellbores may be not only holes made by drilling with a drill, but also recesses produced in some other way. Purely by way of example in this context is to think of milling, molding, mortising, spark erosion or other. Nor does it necessarily have to be machine components. Other elements are also conceivable. In particular, the sealing plug has a preferably flat region which serves for the actual, preferably flush cover of the borehole. Incidentally, the locking ring can not only have an elastically deformable material (for example, by the presence of a certain "layer" with a certain wall thickness), but can preferably consist substantially completely of an elastically deformable material. In particular, in the elastically deformable material to softer plastics or elastomers, rubbery materials and the like to think. Due to the continuous design of the closure ring, it is possible to prevent particularly effectively that fluids and fine dust particles come into the area of the actual borehole. As a result, the service life of a machine can sometimes be significantly increased, in particular by avoiding corrosion. However, even if the well closure device is removed (for example, to replace one type of linear rail with another type or to replace a worn linear rail, as with other components), the proposed downhole closure device may prove to be particularly advantageous because it is generally not required is that first the screw must be cleaned of dirt before it can be unscrewed. This can significantly facilitate any maintenance work. By means of the proposed embodiment of the closure ring using elastic material, the radially continuous formation of the closure ring can be realized in a simple manner. Incidentally, it is pointed out that it is also possible with the proposed training to realize special designs that were previously not possible. This will be discussed in more detail below.

According to a preferred embodiment of the borehole closure device, the borehole closure device, in particular the pressure application section and / or the clamping ring, is provided with a substantially cylindrical or with a substantially annular shape. Such a shape proves particularly suitable in connection with "usual" (round) boreholes.

Furthermore, it is proposed that, in the case of the borehole closure device, parts of the borehole closure device, in particular the pressure application section and / or the clamping ring, are at least partially conical and / or chamfered. With the proposed embodiment, it is possible to be able to realize a comparatively high pressure force (in particular forces in the radial direction) with comparatively low insertion forces (introduction ("pushing in") of the borehole closure device in the axial direction of the borehole). This may prove to be particularly advantageous in terms of handling and / or a particularly tight fit.

Furthermore, it is proposed that in the well closure device the closure stopper has a plate-like closure plate device. This closure plate device can have a comparatively small material thickness usually have only comparatively small forces (in particular in the tangential direction acting forces) must be included in the field of well closure device usually. On the contrary, in the case of borehole closure devices, it is primarily a safe closure function and less the absorption of large forces (in particular in the axial direction). In particular, the plate-like closure plate device can cover a larger area than is the case with the pressure application section, with the sealing plug and / or with the clamping ring (typically also with its sections with the widest surface). Moreover, due to the special configuration of the borehole closure device, it is not absolutely necessary for the plate-like closure plate device to have a particularly high accuracy of fit with respect to the borehole. For a certain "residual gap" can be harmless, since a "sealing effect" is typically realized by the Andruckausübungsabschnitt in cooperation with the clamping ring. This can have a cost-reducing effect in particular. In particular, a chamfered training can help ease the assembly work, as when introducing the sealing plug into the well a certain "guiding effect" can be provided by the chamfer.

Furthermore, it is proposed that in the case of the borehole closure device the pressure application section and the clamping ring are formed integrally or integrally in a use state, in particular using a positive connection device and / or a material connection device, which are preferably designed and set as a predetermined breaking point. A "state of use" is to be understood in particular as a state immediately before the onset of the well closure device. This can also correspond to a condition "ex works". With such a training, the handling of the borehole closure device can be further facilitated. This is simply inserted into the borehole as a "single piece". By pressurizing the borehole closure device "into the borehole", the connecting device then dissolves (for example breakage of a predetermined breaking point) and the two parts required for the "actual fastening" "pressure application section" and "clamping ring" are then "automatically" present. Under a positive connection means can be understood in particular a kind of groove-web connection, the individual parts get out of engagement with a corresponding application of force. In a cohesive connection means, not only a kind of adhesive or the like may be provided, but additionally or alternatively, a thinly executed web between the respective components or the like.

Furthermore, it is proposed that the borehole closure device, in particular the pressure application section and / or the clamping ring, comprise a plastic material. Such materials are available inexpensively and also particularly advantageous moldable. In particular, if it is a thermoplastic, the relevant components can be easily manufactured by injection molding, which is correspondingly inexpensive. Any required small tolerances can be realized in particular by reprints during the cooling of the corresponding component in the mold.

According to a further development of the borehole closure device, parts of the borehole closure device, in particular the closure stopper and / or the pressure application section and / or the clamping ring have different sections with a different pitch in an axial direction. In this way, in particular a particularly high power development in the radial direction paired with a particularly simple handling / assembly can be realized (in particular by a facilitated, "guided" insertion of the borehole closure device into the borehole and / or by a particularly early "pre-tightening" after a comparatively short axial path whereas the "final tensioning" occurs only afterwards and over a relatively long distance).

Furthermore, it is proposed that, in the case of the borehole closure device, the closure stopper is formed integrally, preferably in one piece, with the pressure application section or the clamping ring. Under such a one-piece or one-piece training is in particular a "permanent" connection to understand. To distinguish this so are connections in the manner of a predetermined breaking point or an easily releasable mechanical positive engagement. In particular, alternative designs can be realized with these designs, namely on the one hand designs with a centrally projecting pin, which is pressed into a "separate" (depending on the construction from the outset or only during the Eindrückvorgangs "resulting") clamping ring in the middle. It is also possible that a kind of cap is realized with an inner cavity, wherein the inner cavity comes into engagement with a pressing element which radially outwardly presses a radially encircling web of the cap-like device. According to the proposal, particularly advantageous construction designs can be realized for the respective application.

Furthermore, it is proposed to provide a movement-inhibiting surface area in the borehole closure device, in particular in the area of the pressure-exerting section and / or the clamping ring. For example, surface roughness, a lamellar "corrugation" or the like can be used for this purpose. On the one hand this holding forces can be increased, a "shaking loose" the Borlochverschlusseinrichtung be made more unlikely and beyond also in the manner of a lamellar seal a higher tightness of the well closure device against liquids and / or fine dirt particles can be realized.

In addition, it is proposed that the borehole closure device is designed as a borehole closure device for preferably flush closure of boreholes in machine parts, in particular of guides, preferably of linear guides. In such an application, the presently proposed downhole closure devices can particularly effectively bring out their inherent advantages.

Further details of the invention and in particular exemplary embodiments of the proposed device and the proposed method are explained below with reference to the accompanying drawings. Show it:

1A a first embodiment of a closure plug assembly, which is intended for insertion into a wellbore, in an exploded perspective view, showing an arrangement of the closure plug assembly prior to insertion into the wellbore;

1B the embodiment according to 1A but in a section in the longitudinal direction of the borehole;

1C the embodiment according to 1A , in a section in the longitudinal direction of the borehole, wherein the closure plug assembly is inserted into the borehole;

2A a second embodiment of a closure plug assembly, which is intended for insertion into a wellbore, in an exploded perspective view showing an arrangement of the closure plug assembly prior to insertion into the wellbore;

2 B the embodiment according to 2A but in a section in the longitudinal direction of the borehole;

2C the embodiment according to 2A , in a section in the longitudinal direction of the borehole, wherein the closure plug assembly is inserted into the borehole;

2D a plan view of a part of the plug assembly according to 2 B with a line of sight parallel to arrows IID in 2 B ;

3A A third embodiment of a closure plug assembly, which for insertion into a (in 3A not shown) hole is determined in a perspective view;

3B a perspective sectional view of the sealing plug arrangement according to 3A in a situation at the beginning of mounting the plug assembly in a well, in a longitudinal cut of the well or in a longitudinal direction of the plug;

3C a perspective sectional view of the sealing plug arrangement according to 3A , as in 3B but in a situation at the end of assembly of the plug assembly in the wellbore;

3D a plan view of the plug assembly according to 3A along the direction of the arrow IIID in 3A ,

In 1A - 1C is a first embodiment of a closure plug assembly 1 shown for insertion into a borehole 2 is determined. At the borehole 2 it is a stepped borehole 2 with a near-surface head receiving area 3 and a threaded portion 4 , The borehole 2 serves to receive a screw 5 , wherein the head receiving area 3 of the borehole 2 for receiving the screw head 6 and the threaded portion 4 of the borehole 2 for receiving or for carrying out a threaded pin 7 the screw 5 serves. In the present embodiment shown is the screw 5 around a screw 5 with hexagon socket. However, other screw shapes are conceivable, such as slotted screws, Phillips screws, Torx screws and the like. Using the screw 5 For example, the component 8th in which the borehole 2 is trained to be screwed to another device (not shown here). Purely by way of example, it may be the component 8th to act a rail, in particular a linear guide rail, for a machine tool.

The surface 9 of the component 8th should now be closed as flush as possible by means of a sealing plug arrangement, so that a flush as possible overall surface of the component 8th , also in the area of the borehole 2 results. Furthermore, the sealing plug arrangement 1 preferably act sealing, so in particular no liquids and / or dirt particles in the head receiving area 3 of the borehole 2 can penetrate (especially in an area immediately adjacent to the screw head 5 lies). For this purpose, first in a first step, a clamping ring 10 in the borehole 2 used. In particular, it is possible that the clamping ring 10 "Up to the stop" on the upper end of the screw head 5 is put on. The clamping ring 10 consists of an elastic material. However, the elasticity is chosen to be relatively low, resulting in high clamping forces as soon as the actual sealing plug 11 was set up.

As in particular from 1A can be seen, is the clamping ring 10 beyond trained radially. That is, there is no radial slot through the clamping ring 10 goes through, so that clamping ring 10 forms a closed ring. This also prevents "in the region of the clamping ring 10" a liquid and / or dirt particles from the well area above the clamping ring 10 in the area below the clamping ring 10 could penetrate and vice versa.

After the clamping ring 10 in the borehole 2 has been positioned, the stopper becomes 11 set up ( 1C ). The sealing plug 11 has a pin part 12 and a plate part 13 on. The pen part 12 is on its outer wall with a conical area 14 Mistake. This conical area 14 is in the assembled state ( 1C ) in intimate contact with the clamping ring 10 , The clamping ring 10 thus becomes firm against the inner wall of the borehole 2 (Head receiving area 3 ) pressed. Through this non-positive clamping seat holds the stopper 11 together with the clamping ring 10 stuck in the borehole 2 ,

How one 1B can still be seen, is in a lower, the screw 5 facing area of the pin part 12 a chamfer 15 intended. The chamfer 15 serves to facilitate insertion of the pin part 12 of the sealing plug 11 in the clamping ring 10 into it. It should be noted in this regard that when mounting the immediate entry of the pen part 12 of the sealing plug 11 in the clamping ring 10 optically can not be checked by the fitter. Accordingly, a "mechanical guide" is correspondingly advantageous.

To achieve an additional sealing effect, the sealing plug is 11 in the area of the plate part 13 on its outside with sealing blades 16 Mistake. As a result, the tightness of the sealing plug 11 increased again.

How one 1C can take, forms the surface 9 of the component 8th together with the surface of the plate part 13 of the sealing plug 11 in the mounted state, a substantially flush surface.

In 2A - 2D is an alternative plug stopper assembly 17 shown. Also, this stopper assembly 17 should be a borehole 2 in which a screw 5 is screwed in (borehole 2 analogous to the borehole 2 in 1A - 1C ), close tightly. In order to avoid unnecessary repetition, identical or functionally similar components in the different embodiments (including the following embodiments) will not be described again in detail. In addition, identical reference numerals are used for identical or functionally similar components for the sake of simplicity. It should be noted that an identical reference sign does not necessarily mean that the respective components are completely identical.

In the case of the present invention shown plug stopper assembly 17 is the stopper 18 formed like a cup. That is, the stopper 18 has no centrally disposed pin part, but on the contrary a projecting in the axial direction, radially completely circumferential peripheral edge 19 , which forms a closed ring in the present example ( 2D ). The outside of the peripheral edge 19 comes with the inner wall of the borehole 2 (Head receiving area 3 ) in intimate contact ( 2C ). Due to the comparatively large contact surface of peripheral edge 19 and borehole wall ensures a good sealing effect against the ingress of liquids and small particles.

Furthermore, in 2A - 2C a plate-like pressure element 20 to recognize. During assembly, the pressure element 20 on the top of the screw head 6 set up ( 2C ). The pressure element has a preferably substantially radially circumferential projection region 21 on. The outer wall of the projection area 21 (viewed in the radial direction) is called a conical wall 22 educated. Will now the stopper 18 firmly in the borehole 2 pushed in, so pushes the conical wall 22 the peripheral edge 19 radially outward against the inner wall of the borehole 2 , As a result, a high clamping force is achieved, which causes the closure plug 18 not from the borehole 2 can fall out.

To assist the clamping action, at least the peripheral edge 19 of the sealing plug 18 made of an elastic material with comparatively low elasticity.

In 3A - 3D Finally, there is another stopper assembly 23 in different mounting situations within a borehole 2 shown.

The stopper assembly 23 has in a delivery state essentially two main parts, namely a sealing plug area 24 and a clamping ring area 25 , Locking plug area 24 and clamping ring area 25 are over a thin jetty 26 integrally connected.

The jetty 26 serves as a predetermined breaking point and ruptures during assembly of the sealing plug arrangement 23 in the borehole 2 automatically from (transition from 3B on 3C ).

The plug area 24 has a plate part 27 on, of which a projecting pin part 28 projects. The projecting pin part 28 is with an interior recess 29 educated. The outer walls 30 of the pen part 28 are slightly conical in order to be fully assembled ( 3C ) to realize a sufficient clamping force.

The clamping ring area 25 has in the presently illustrated embodiment, a triangular cross-section, wherein the hypotenuse of the triangle is concave inwardly formed.

The clamping ring area 25 comes with an assembly of the plug assembly 23 with its lower section with a screw head 6 a screw 5 in contact. As a further downward movement through the screw head 6 is prevented, pressing on the stopper part leads 24 (the plate part 27 of the plug area 24 ) in the direction of a longitudinal axis 23 ' the plug stopper assembly 23 to a corresponding mechanical stress of the web 26 until it breaks off (as a predetermined breaking point). This moves the plug area 24 in the longitudinal direction of the borehole 2 or in the direction of the longitudinal axis 23 ' further down. The conically shaped outer wall 30 of the plug area 24 occurs in intimate, non-positive contact with the clamping ring area 25 , which means that in the mounted state ( 3C ) the stopper assembly 23 (Locking plug area 24 , Clamping ring area 25 ) firmly in the borehole 2 sitting.

As in particular from 3D can be seen, is the clamping ring area 25 beyond trained radially. That is, there is no radial slot through the clamping ring area 25 goes through so that the clamping ring area 25 a closed, around the longitudinal axis 23 ' forms extending ring.

Again, the clamping ring area 25 made of an elastic material with comparatively low elasticity. The entire stopper assembly 23 For example, it can be easily manufactured by a multi-component injection molding process.

For the sake of completeness, it is pointed out that all illustrated component arrangements are each rotationally symmetrical. However, the basic idea of the present invention can also be applied analogously to other geometries.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 3046590 A [0008]
• DE 9316349 U1 [0009]
• EP 0803656 [0010]

Claims (10)

Borehole closure device ( 1 . 17 . 23 ) for fastening in, in particular for covering boreholes ( 2 ) in machine components ( 8th ), comprising a sealing plug ( 11 . 18 . 27 ), a Andruckausübungsabschnitt ( 14 . 22 . 28 ) and a radially outside the Andruckausübungsabschnitts ( 14 . 22 . 28 ) arranged clamping ring ( 10 . 19 . 25 ), characterized in that the clamping ring ( 10 . 19 . 25 ) is formed radially continuous and has an elastically deformable material. Borehole closure device ( 1 . 17 . 23 ) according to claim 1, characterized in that the borehole closure device ( 1 . 17 . 23 ), in particular the pressure application section ( 14 . 22 . 28 ) and / or the clamping ring ( 10 . 19 . 25 ) have a substantially cylindrical or a substantially ring-like shape. Borehole closure device ( 1 . 17 . 23 ) according to claim 1 or 2, in particular according to claim 2, characterized in that parts of the well closure device ( 1 . 17 . 23 ), in particular the pressure application section ( 14 . 22 . 28 ) and / or the clamping ring ( 10 . 19 . 25 ), at least partially cone-like ( 14 . 22 . 28 ) and / or chilled ( 15 ) are formed. Borehole closure device ( 1 . 17 . 23 ) according to one of the preceding claims, characterized in that the sealing plug ( 11 . 18 . 27 ) a plate-like closure plate device ( 13 . 27 ) having. Borehole closure device ( 1 . 17 . 23 ) according to one of the preceding claims, characterized in that the pressure application section ( 14 . 22 . 28 ) and the clamping ring ( 10 . 19 . 25 ) are formed in one use state in one piece or in one piece ( 3a ), in particular using a positive connection device and / or a cohesive connection device ( 26 ), which preferably as a predetermined breaking point ( 26 ) are designed and furnished. Borehole closure device ( 1 . 17 . 23 ) according to one of the preceding claims, characterized in that the borehole closure device ( 1 . 17 . 23 ), in particular the pressure application section ( 14 . 22 . 28 ) and / or the clamping ring ( 10 . 19 . 25 ), a plastic material. Borehole closure device ( 1 . 17 . 23 ) according to one of the preceding claims, in particular according to one of claims 3 to 7, characterized in that parts of the well closure device ( 1 . 17 . 23 ), in particular the sealing plug ( 11 . 18 . 27 ) and / or the pressure application section ( 14 . 22 . 28 ) and / or the clamping ring ( 10 . 19 . 25 ), seen in an axial direction different sections with a different pitch ( 14 . 15 ) having. Borehole closure device ( 1 . 17 . 23 ) according to one of the preceding claims, characterized in that the sealing plug ( 11 . 18 . 27 ) in one piece, preferably in one piece, with the pressure application section ( 14 . 22 . 28 ) or the clamping ring ( 10 . 19 . 25 ) is trained. Borehole closure device ( 1 . 17 . 23 ) according to one of the preceding claims, characterized by a movement-inhibiting surface area, in particular in the area of the pressure application section ( 14 . 22 . 28 ) and / or the clamping ring ( 10 . 19 . 25 ). Borehole closure device ( 1 . 17 . 23 ) according to one of the preceding claims, characterized in that it can be used as a borehole closure device ( 1 . 17 . 23 ) for preferably flush closure of boreholes ( 2 ) in machine parts ( 8th ), in particular of guides, preferably of linear guides, is formed.

Images