SLIDING ELEMENT, IN PARTICULAR FOR A STRETCHING INSTALLATION AND/OR CONVEYOR CHAIN, AND ASSOCIATED STRETCHING INSTALLATION OR CONVEYOR CHAIN

• US 20200132118A1
• Filed: 05/15/2018
• Published: 04/30/2020
• Est. Priority Date: 07/06/2017
• Status: Active Grant

• Current Assignee: Bruckner Maschinenbau GmbH & Co. KG (Brückner Group GmbH /Siegsdorf/)
• Original Assignee: Bruckner Maschinenbau GmbH & Co. KG (Brückner Group GmbH /Siegsdorf/)
• Inventors: SWOBODA, Martin, HAUSL, Tobias, KULINYAK, Emmerich, KRAUS, Sebastian, MURNER, Georg, UNTERREINER, Markus, BAMBERGER, Werner, GIAPOULIS, Anthimos, BAUMEISTER, Michael
• Granted Patent: US 11,085,490 B2
• Time in Patent Office: Days
• CPC Class Codes: B29C 55/08 transverse to the direction of feed
• CPC Class Codes: B29C 55/165 Apparatus therefor
• CPC Class Codes: B29C 55/20 Edge clamps
• CPC Class Codes: B29D 7/01 Films or sheets
• CPC Class Codes: F16C 33/16 Sliding surface consisting mainly of graphite

Abstract

The invention relates to a sliding element, in particular for a stretching installation and/or a conveyor chain, comprising graphite or electrographite, wherein the sliding element has pores which have an open pore size of ≥7.5% by volume, and wherein the particle size of the graphite particles used as a starting material for the sliding elements is between 3 μm and 15 μm.

Claims

1. Sliding element, in particular for a stretching installation and/or conveyor chain, comprising graphite or electrographite, wherein

the sliding element has pores, the open pore size being ≥

7.5% by volume, and

the particle size of the graphite particles used as a starting material for the sliding elements is between 3 μ

m and 15 μ

m.

2. Sliding element according to claim 1, wherein the open pore size is at least ≥

8% by volume or preferably ≥

9% by volume, 10% by volume, 11% by volume, 12% by volume, 13% by volume, 14% by volume or ≥

15% by volume.

3. Sliding element according to claim 1, wherein the open pore size of the sliding element is ≤

20% by volume, in particular ≤

18% by volume, 16% by volume, 15% by volume, 14% by volume, 13% by volume, 12% by volume or in particular ≤

11% by volume.

4. Sliding element according to claim 1, wherein the sliding element is impregnated with inorganic salts and/or inorganic salts are embedded in the sliding element.

5. Sliding elements according to claim 1, wherein the particle size of the graphite particles used as a starting material for the sliding elements is greater than or equal to 4 μ

m, 5 μ

m, 6 μ

m, 7 μ

m, 8 μ

m, 9 μ

m or 10 μ

m, or is less than 14 μ

m, 13 μ

m, 12 μ

m, 11 μ

m, 10 μ

m, 9 μ

m, 8 μ

m, 7 μ

m, 6 μ

m, or is less than 5 μ

m.

6. Sliding elements according to claim 1, wherein the graphite particles used as a starting material for manufacturing the sliding elements are in a particle size distribution in which the median value d(50) for the particle size is between 14 μ

m and 18 μ

m, and the value for d(10) is between 2 μ

m and 4 μ

m and for d(90) is between 42 μ

m and 50 μ

m.

7. Sliding elements according to claim 1, wherein at least 60%, preferably more than 65%, 70%, 75%, 80%, 85%, 90%, and in particular over 95% or preferably at least 96%, 97%, 98% and in particular 99% or 100% of the pores provided in the sliding element are soaked with oil.

8. Sliding element according to claim 4, wherein the inorganic salts are embedded at least in a surface layer of the sliding element and/or the sliding element is impregnated with inorganic salts in this region, the sliding element preferably being fully impregnated with the inorganic salts, preferably in a density distribution which is identical or deviates therefrom by less than 20% or in particular less than 10%.

9. Sliding element according to claim 1, wherein the sliding element is impregnated with inorganic salts or comprises embedded inorganic salts, which consist of or comprise phosphates or tertiary orthophosphates and preferably aluminium phosphate.

10. Sliding element according to claim 5, wherein the inorganic salts make up 1% by weight to 10% by weight, preferably more than 2% by weight, 3% by weight or 4% by weight and preferably less than 10% by weight, in particular less than 8% by weight, 7% by weight, 6% by weight or 5% by weight.

11. Sliding element according to claim 1, wherein the sliding element is formed as an isostatically pressed sliding element.

12. Sliding element according to claim 1, wherein the sliding surface of the sliding element has a maximum roughness at which height deviations are below 5 μ

m, in particular below 4 μ

m, 3 μ

m or preferably below 2 μ

m or 1 μ

m.

13. Sliding element according to claim 12, wherein the sliding surface of the sliding element is polished.

14. Stretching installation or conveyor chain for a stretching installation, comprising sliding elements according to claim 1.

15. Stretching installation or conveyor chain for a stretching installation according to claim 14, wherein, as a counter partner for the conveyor chain, a carrier construction preferably in the form of a guide rail and/or carrier rail and/or control rail is provided, the thermal expansion coefficient of which corresponds to the thermal expansion coefficient of the sliding elements or deviates therefrom by less than 25%, in particular less than 20%, 15%, 10% or less than 5%.

16. Stretching installation or conveyor chain for a stretching installation according to claim 14, wherein the guide rail and/or carrier rail and/or control rail consists of a material having a degree of hardness which corresponds to the degree of hardness of the sliding elements or deviates therefrom by less than 25%, in particular less than 20%, 15%, 10% or less than 5%.

17. Stretching installation or conveyor chain for a stretching installation according to claim 14, wherein the guide and/or carrier and/or control rail is heated above a temperature limit value to reduce the coefficient of friction.