REFRACTORY ANCHOR

Abstract

A refractory anchor including an elongated mounting pin of which one end is weldable to an object and a plate-like anchor fin connected to the elongated mounting pin. The refractory anchor(s) may be included in an assembly in which a number of refractory anchors are welded to an object, and also disclosed is a method for manufacturing the assembly.

Claims

1. A refractory anchor comprising: an elongated mounting pin of which one end is weldable to an object and a plate-like anchor fin connected to the elongated mounting pin, wherein in that the plate-like anchor fin extends outwardly seen from the elongated mounting pin in such a manner that seen from above the refractory anchor, the refractory anchor defines an outer side and an inner side, wherein the outer side and the inner side are divided by means of the plate-like anchor fin and the elongated mounting pin, wherein the outer side is free from any projections extending from the plate-like anchor fin and the elongated mounting pin into the outer side.

2. The refractory anchor according to claim 1, wherein two plate-like anchor fins are connected to the elongated mounting pin, wherein the two plate-like anchor fins extend outwardly in two opposing directions seen from the elongated mounting pin in such a manner that seen from above the refractory anchor, the outer side and the inner side are divided by means of the two plate-like anchor fins and the elongated mounting pin, wherein the outer side is free from any projections extending from the two plate-like anchor fins and the elongated mounting pin into the outer side.

3. The refractory anchor according to claim 2, wherein the two anchor fins defining the inner side and the outer side lie in one virtual plane.

4. The refractory anchor according to claim 1, wherein the refractory anchor is configured as a strip or as a strip section around lining material positioned or to be positioned on at least the inner side of the refractory anchor.

5. The refractory anchor according claim 1, wherein the anchor fin(s) is connected to a connector, wherein the connector is connected to the elongated mounting pin, wherein the connector and the anchor fin(s) are made in one piece, and/or the connector and the anchor fin(s) are made from the same material.

6. The refractory anchor according to claim 5, wherein the connector provides a through hole for receiving the elongated mounting pin for providing a connection between the elongated mounting pin and the connector, wherein the connection between the elongated mounting pin and the connector is provided by friction fit.

7. The refractory anchor according to claim 1, wherein the elongated mounting pin is made from a different material than the at least one anchor fin.

8. The refractory anchor according to claim 7, wherein the elongated mounting pin is made from a first alloy and the anchor fin(s) is made of a second alloy different from the first alloy.

9. The refractory anchor according to claim 1, wherein the elongated mounting pin is made of a material configured for stud welding the elongated mounting pin to an object.

10. The refractory anchor according to claim 2, wherein each of the two anchor fins defining the inner and the outer side of the refractory anchor is provided with a tab extending towards the inner side of the refractory anchor.

11. The refractory anchor according to claim 10, wherein each tab defines an acute angle with the anchor fin, wherein the acute angle lies between 35-85 degrees.

12. The refractory anchor according claim 2, wherein the elongated mounting pin comprises the end weldable to an object and a further end opposite to the end weldable to an object seen in the longitudinal direction of the elongated mounting pin, wherein each anchor fin has an anchor fin portion extending above the further end of the elongated mounting pin seen in the longitudinal direction of the elongated mounting pin.

13. The refractory anchor according to claim 12, wherein the sides of the anchor fin portions facing each other have a cut-out.

14. The refractory anchor according to claim 1, wherein between a connection section of the elongated mounting pin with the anchor fin(s) and the end weldable to an object, the elongated mounting pin comprises a section where there is a distance between a side of the anchor fin facing the elongated mounting pin and the elongated mounting pin.

15. The refractory anchor according to claim 1, wherein the plate-like anchor fin has at least one rounded corner, in particular two corners of the plate-like anchor fin located after installation closer to an object than the other two corners of the plate-like anchor fin are rounded corners.

16. The refractory anchor according claim 1, wherein an anchor fin side facing away from the elongated mounting pin comprises a cut-out between two corners of the plate-like anchor fin.

17. The refractory anchor according claim 1, wherein the refractory anchor comprises only two anchor fins.

18. An assembly comprising an object and a number of refractory anchors welded on the object for providing a strip, wherein each refractory anchor comprising an elongated mounting pin of which one end is weldable to an object and a plate-like anchor fin connected to the elongated mounting pin, wherein in that the plate-like anchor fin extends outwardly seen from the elongated mounting pin in such a manner that seen from above the refractory anchor, the refractory anchor defines an outer side and an inner side, wherein the outer side and the inner side are divided by means of the plate-like anchor fin and the elongated mounting pin, wherein the outer side is free from any projections extending from the plate-like anchor fin and the elongated mounting pin into the outer side.

19. The assembly according to claim 18, wherein an end of the anchor fin opposite to the elongated mounting pin of a first refractory anchor is located adjacentor against, an end of the anchor fin opposite to the elongated mounting pin of a second refractory anchor.

20. The assembly according to claim 19, wherein the refractory anchors are configured for providing a curved strip around the object by positioning the anchor fin(s) of the second refractory anchor under an angle smaller than 180 degrees with respect to the anchor fin(s) of the first refractory anchor.

21. A method for providing an assembly according to claim 18, wherein the elongated mounting pin of the refractory anchors are joined to the object by stud welding.

22. The method according to claim 21, wherein an end of the anchor fin opposite to the elongated mounting pin of a first refractory anchor is positioned adjacent, or against, an end of the anchor fin opposite to the elongated mounting pin of a second refractory anchor.

23. The method according to claim 22, wherein the anchor fin(s) of the second refractory anchor is positioned under an angle smaller than 180 degrees with respect to the anchor fin(s) of the first refractory anchor.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be explained in more detail below with reference to the appended figures showing exemplary embodiments of a refractory anchor.

[0023] FIGS. 1a, 1 b, 1c, 1d, 1e, and 1f show various respective views of a first embodiment of a refractory anchor;

[0024] FIGS. 2a, 2b, 2c, 2d, 2e, and 2f show various respective views of a second embodiment of a refractory anchor.

DETAILED DESCRIPTION

[0025] Like parts are indicated by the same reference signs in the various figures.

[0026] Each feature disclosed with reference to the figure can also be combined with another feature disclosed in this disclosure including the claims, unless it is evident for a person skilled in the art that these features are incompatible.

[0027] FIGS. 1a-1f and 2a-2f show perspective, front, top and side views from two different embodiments of a refractory anchor 1; 101 disclosed in this document.

[0028] The differences between these refractory anchors 1; 101 will be discussed in detail further below. The two refractory anchors 1; 101 both comprise an elongated mounting pin 3; 103 of which a first end 5; 105 is weldable to an object 10; 110 and two plate-like anchor fins 9, 9; 109, 109 connected to an end section or connection section indicated by arrow 6; 106 adjacent a second end 7; 107 of the elongated mounting pin 3; 103. The two plate-like anchor fins 9, 9; 109, 109 extend outwardly in two opposing directions seen from the elongated mounting pin 3; 103 in such a manner that seen from above the refractory anchor 1; 101, see for example FIGS. 1e and 2e showing a top view of the refractory anchor 1; 101, the refractory anchor 1; 101 defines an outer side indicated by arrow A and an inner side indicated by arrow B. The outer side A and the inner side B are divided by means of the two plate-like anchor fins 9, 9; 109, 109 and the elongated mounting pin 3; 103, in particular in the embodiments shows a connector 15; 115 around the elongated mounting pin 3; 103 for connecting the two plate-like anchor fins 9, 9; 109, 109 to the elongated mounting pin 3; 103. As can be seen in FIGS. 1a, 2a, 1e, 2e the outer side A is free from any projections extending from the two plate-like anchor fins 9, 9; 109, 109 and the elongated mounting pin 3; 103 into the outer side A. The angle (FIGS. 1e, 2e) between each surface of two anchor fins facing towards the outer side is 180 degrees. The angle may be approximately 180 degrees, wherein approximately means plus minus 10 degrees. As described above, the refractory anchor 1; 101 has two functions, i.e. the first function is anchoring a liner, in particular on the inner side of the refractory anchor 1; 101, the second function is providing a support, or a stop/termination for forming a border where lining material should terminate. Further, a relatively fast installation time is provided by means of the elongated mounting pin 3, 103 of the refractory anchor 1; 101, which may be welded by stud welding to an object.

[0029] The two plate-like anchor fins 9, 9; 109, 109 of each refractory anchor 1, 101 are identical. Further, as can be seen best in FIGS. 1e and 2e the two anchor fins 9, 9; 109, 109 of each refractory anchor 1, 101 defining the inner side B and the outer side A lie in one virtual plane. This virtual plane also extends through the center line (not shown) of the elongated mounting pin 3; 103. The two plate-like anchor fins 9, 9; 109, 109 are mirror symmetrical with respect to a plane through the center line of the elongated mounting pin 3; 103 and perpendicular to the virtual plane in which the two anchor fins 9, 9; 109, 109 of the refractory anchor 1, 101 extend. The two plate-like anchor fins 9, 9; 109, 109 of each refractory anchor 1, 101 are configured for forming a strip or a strip section around lining material positioned or to be positioned on at least the inner side B of the refractory anchor 1, 101.

[0030] In addition, the refractory anchor 1, 101 is configured from a material perspective and/or a design perspective to contribute in anchoring the liner on the inner side. It is possible to provide at least one of the two anchor fins with tabs on the inner side facing the liner. As shown in the figures each of the two anchor fins 9, 9; 109, 109 defining the inner and the outer side of the refractory anchor is provided with a tab 21, 21; 12, 121 extending towards the inner side B of the refractory anchor 1, 101. Each tab 21, 21; 12, 121 defines an acute angle with the anchor fin 9, 9; 109, 109. The acute angle lies between 35-85 degrees, more preferably between 50-70 degrees. To further improve the liner anchoring results it is further optionally possible to provide additional anchor fins (not shown) connected to the elongated mounting pin 3; 103 on the inner side A between the two main anchor fins 9, 9; 109, 109 defining the inner side A and the outer side B.

[0031] The two plate-like anchor fins 9, 9; 109, 109 of each refractory anchor 1, 101 are connected to each other by the connector 15; 115 as mentioned above, wherein the connector is connected to the elongated mounting pin 3; 103. The connector 15; 115 and the two anchor fins 9, 9; 109, 109 are made in one piece, and the connector and the two anchor fins 9, 9; 109, 109 are made from the same material, wherein the composition of this material is configured for providing long lasting results for anchoring a liner. The connector 15; 15 comprises a through hole 19; 119 for receiving the connection section 6; 106 of the elongated mounting pin 3; 103 for providing a connection between the elongated mounting pin 3; 103 and the connector 15; 115, wherein the connection between the elongated mounting pin 3; 103 and the connector 15; 115 is provided by friction fit which has various advantages in that the friction fit is faster, simpler, safer and more operator-friendly over other known connecting techniques such as an inner thread (not shown) of the through hole cooperating with an outer thread (not shown) on the elongated mounting pin or by welding the connector to the elongated mounting pin.

[0032] The elongated mounting pin 3, 103 further comprises a section indicated by arrow 36, 136 below the second section 6, 106 where there is a distance indicated by arrow R (FIGS. 1d, 2d) between sides of the anchor fins 9, 9; 109, 109 facing each other and the elongated mounting pin 3, 103. This distance R reduces a direct or relatively short heat path between the upper sides 45, 45; 145, 145 (FIGS. 1a,b and 2a,b) of the anchor fins 9, 9; 109, 109 and the end 5, 105 of the elongated mounting pin 3, 103 weldable or welded to object 10; 110, such that a refractory anchor can be provided with an improved configuration to withstand high temperatures on the hot side of the refractory anchor 1; 101. After installation, the upper sides 45, 45; 145, 145 of the refractory anchor 1, 101 are facing the hot side.

[0033] Further, each plate-like anchor fin 9, 9; 109, 109 of the refractory anchor 1; 101 has at least one rounded corner 37, 37; 137, 137, i.e. the two corners 37, 37; 137, 137 of each plate-like anchor fin 9, 9; 109, 109 located after installation closer to the object 10; 110 than the other two corners 39, 39; 139, 139 of each plate-like anchor fin 9, 9; 109, 109 are rounded corners. Without being bound by theory, the modification of the corners 37, 37; 137, 137 close to the object into round corners instead of sharp corners has reduced the number of cracks after a predetermined time period of use in the liner drastically. Of course, it is also possible to make all corners of the anchor fin 9, 9; 109, 109 round.

[0034] The refractory anchor 1, 101 only comprises two anchor fins 9, 9; 109, 109. Such a refractory anchor 1, 101 provides excellent liner anchor results on the inner side B and is able to provide a plate-like border function on the outer side A.

[0035] The main difference between the refractory anchor 1 shown in FIGS. 1a-f and the refractory anchor 101 shown in FIGS. 2a-f is that the refractory anchor 1 is normally used as a termination plate, such that after installation of the refractory anchor 1 and applying lining material, there is only lining material on the inner side B of the refractory anchor 1 shown in FIGS. 1a-f, whereas the refractory anchor 101 shown in FIGS. 2a-f is used as a supporting element to be used in a termination zone in which lining material is located on both the inner side B and the outer side A, wherein on the outer side A the lining material ends within a predetermined distance for forming a border together. The predetermined distance is relatively short, for example smaller than the longest dimension of the refractory anchor 1, i.e. defined by the outer ends of the two anchor fins 109, 109 and identified by arrow L in FIG. 2e.

[0036] In the refractory anchor 101, each anchor fin has an anchor fin portion 109a, 109a (indicated by a dotted line X in the anchor fins in FIG. 2d) extending above the second end 107 of the elongated mounting pin 103 seen in the longitudinal direction of the elongated mounting pin 103. The sides 131, 131 of the anchor fin portions 109a, 109a facing each other define a space 140 between these sides 131, 131. This space 140 provides a submerged section and this submerged section can be filled with lining material providing a liner temperature buffer in the submerged section such that there is no direct heat path between the hottest side of the refractory anchor and the end 105 welded to the object 110. For the sake of brevity reference is made to the above description for the advantages of the submerged section. As can be seen in the front view of FIG. 2d both sides 131, 131 of the anchor fin portions 109a, 109a facing each other have a cut-out 133, 133. Further, each anchor fin side 135, 135 facing away from the elongated mounting pin 103 comprises a cut-out 138, 138 between two corners 137, 139; 137, 139 of the plate-like anchor fins 109, 109.

[0037] In FIGS. 1c and 2c a portion of an assembly as claimed is shown, i.e. the assembly comprises an object 10; 110 and a number of refractory anchors 1, 101 for forming a strip, wherein in FIGS. 1c and 2c only one refractory anchor 1, 101 is shown.

[0038] Further, it is noted that the anchor fins 9, 9; 109, 109 also have a minimal horizontal spacing/height H2 as shown in FIG. 2c between the a virtual horizontal plane (for example the object 10; 110 in FIGS. 1c and 2c) around the first end 5; 105 of the elongated mounting pin 3; 103 and the underside of the anchor fins 9, 9; 109, 109. In the refractory anchor 1, 101 the mounting pin 3; 103 is arranged with respect to the anchor fins 9, 9; 109, 109 to provide this minimal vertical height H2. This minimal vertical height H2 of the refractory anchor 1, 101 is important during installation to guarantee that lining material in liquid form is free to flow under the anchor fins 9, 9; 109, 109 to obtain excellent lining results.

[0039] For providing an assembly an end/side 35, 35; 135, 135 of the anchor fin 9, 9; 109, 109 opposite to the elongated mounting pin 3; 103 of a first refractory anchor 3; 103 is located adjacent or against, an end/side 35, 35; 135, 135 of the anchor fin 9, 9; 109, 109 opposite to the elongated mounting pin 3; 103 of a second refractory anchor (not shown in FIGS. 1c and 2c). In the method for manufacturing the assembly, the refractory anchors are joined to the object by stud welding, preferably drawn arc stud welding. The object 10, 110 shown in FIGS. 1c and 2 is flat, but the refractory anchors are configured for providing a curved strip around an object having a radius of curvature such as for example a cylindrical wall. The curved strip can be easily obtained by positioning the anchor fins of the second refractory anchor (not shown) under an angle (FIGS. 1c, 2c) smaller than 180 degrees with respect to the anchor fins of the first refractory anchor 1, 101. Such a strip can be obtained if the longest dimension L of the refractory anchors 1, 101 is relatively small, i.e. smaller than 20 cm for example approximately 8 cm. Each anchor fin 9, 9; 109, 109 may have a thickness indicated by arrows T smaller than 1 cm for example approximately 3 mm. The height indicated by arrow H of the refractory anchor 1, 101 measured from the object 10, 110 is smaller than 7.5 cm, for example 2.5 cm. As shown in the drawings the elongated mounting pin 3; 103 has a cylindrical shape. However, different shaped pins having corners for forming a pin having a polygonal cross-section can also be used, for example a plate shaped pin. The diameter indicated by arrow D of the elongated mounting 3; 103 is smaller than 2.5 cm, for example 1 cm.

[0040] It is further possible to provide a refractory anchor having a plate-like anchor fin (not shown in the figures), wherein the refractory anchor defines an outer side and an inner side, wherein the outer side and the inner side are divided by means of the plate-like anchor fin and the elongated mounting pin, wherein the outer side is free from any projections extending from the plate-like anchor fin and the elongated mounting pin into the outer side.