EP3722502A1 - Frog with shortened mono-block cast - Google Patents

Frog with shortened mono-block cast Download PDF

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Publication number
EP3722502A1
EP3722502A1 EP20000144.4A EP20000144A EP3722502A1 EP 3722502 A1 EP3722502 A1 EP 3722502A1 EP 20000144 A EP20000144 A EP 20000144A EP 3722502 A1 EP3722502 A1 EP 3722502A1
Authority
EP
European Patent Office
Prior art keywords
mono
rails
frog
tip
shortened
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20000144.4A
Other languages
German (de)
English (en)
French (fr)
Inventor
Zdenek SNAJDR
Marek SMOLKA
Petr Mucha
Jan Vykydal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dt Vyhybkarna A Strojirna AS
Original Assignee
Dt Vyhybkarna A Strojirna AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dt Vyhybkarna A Strojirna AS filed Critical Dt Vyhybkarna A Strojirna AS
Publication of EP3722502A1 publication Critical patent/EP3722502A1/en
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B7/00—Switches; Crossings
    • E01B7/10—Frogs
    • E01B7/12—Fixed frogs made of one part or composite

Definitions

  • the technical solution concerns the construction of a frog with shortened mono-block cast, used at railway switches.
  • An example of all-cast frogs are frogs according to CZ patent file No. 282131 , the disadvantage of which is their complicated production, demanding moulding and difficult cleaning after casting, high steel consumption for their production, high weight, increased costs for a considerable extent of their machining to the desired geometric shape, increased possibility of machining defects. This is also related to the high energy intensity of their manufacture, which is given by the dimensions and weight of the frog casting, the considerable extent of machining and the increased demands on the repair of defects.
  • frogs with shortened mono-block according to the CZ utility model No. 5698 is the construction lay-out of the end part, which does not meet the requirements for providing the necessary stiffness necessary to transmit dynamic forces occurring during the rolling stock movement, which would prevent excessive stress in shaped cross section spots.
  • An exemplary embodiment of Insert frogs are the frogs according to CN patent file No. 102021867 , the disadvantage of which is a complicated construction, an unfavourable transition of the wheel from the rail steel part to the cast part of the frog in the area of the frog neck.
  • the disadvantage of a frog with forged hardened tip and surface hardened wing rails is lower stiffness and shorter service life.
  • the construction design does not offer the necessary compactness of the tip and wing rail connection, which can result in loose joints, loss of stiffness and reduced service life.
  • frogs with a shortened mono-block casting are the frogs according to the CZ utility model No. 30786 , when the tip rails are welded together along the length of the contact surfaces on the head, heel and forehead after the assemblage and subsequently welded to the machined frog casting.
  • Three-point contact inserts are used for the overall frog assemblage, in the place on the web, under the head and at the foot of the wing rails and the connecting tip rails.
  • the disadvantage of frogs with shortened casting of mono-block according to UV 30786 is the constructional arrangement of the connecting tip rails, when the long-term operational loading of the weld of the contact surfaces on the head of the connecting tip rails leads to defects with the possibility of cracks formation and development.
  • the design of the shortened mono-block brings the benefits of complete mono-block frogs in terms of monolithing and mechanical, static and dynamic certainty of the structure, whose carrier at the point where the rail wheels pass through the groove is provided by a monolithic casting while maintaining the shortened mono-block advantage like savings of expensive casting material and simplification of its production, i.e. shortening the length of the casting and thus reducing energy consumption for its production, reducing foundry defects and straightening costs and other related production costs.
  • the tip rails are then permanently joined over the entire length of the contact surface by a front weld for the sake of consistency in the subsequent permanent / non-rewirable joint with the mono-block cast.
  • the double-sided wing rails forming the grooves run-out of the mono-block castings are detachably connected to the monoblock casting part by high-strength bolts and to the part of the tip rails by high-strength bolts through inserts and shims which are at the same time relying only on the lower part of the head and upper part of the foot of the tip rails.
  • wing rail heads are flush-mounted from the side with the outer side walls of the mono-block casting by machining in parallel in the vertical direction.
  • FIG. 1 schematically shows the frog with the shortened cast mono-block in plan view
  • Fig. 2 shows a cross-section A-A of the connection of the tip rails with high-strength screws through the shims
  • Fig. 3 shows a cross-section B-B of the connection of the tip rails and the wing rails with high-strength bolts through shims and inserts
  • Fig. 4 shows the connection of the wing rails to the mono-block casting and the alignment of the lateral sides of the wing rail heads with the outer side walls of the mono-block casting.
  • Fig. 1 consists of a shortened casting of mono-block 1 permanently connected on one side of the frog before the start of the casting of monoblock 1 with two pieces of connecting rails 2 and on the other side it is permanently connected at the widest part of the tip 3 of the casting monoblock 1 with the tip rails 4 .
  • the heads of the wing rails 15 are aligned from the side with the outer side walls 17 of the mono-block cast 1 by machining in parallel in the vertical direction, as shown in Fig. 4 .
  • the technical solution can be used for all they types of switches, especially switches designed for modernization of railways with high demands on stiffness and resistance to dynamic stress and wear.
  • the technical solution is advantageously applicable also to switches for urban tram transport.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Railway Tracks (AREA)
EP20000144.4A 2019-04-11 2020-04-06 Frog with shortened mono-block cast Withdrawn EP3722502A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CZ2019-36118U CZ33029U1 (cs) 2019-04-11 2019-04-11 Srdcovka se zkráceným odlitkem monobloku

Publications (1)

Publication Number Publication Date
EP3722502A1 true EP3722502A1 (en) 2020-10-14

Family

ID=67477226

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000144.4A Withdrawn EP3722502A1 (en) 2019-04-11 2020-04-06 Frog with shortened mono-block cast

Country Status (2)

Country Link
EP (1) EP3722502A1 (cs)
CZ (1) CZ33029U1 (cs)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5413442A (en) * 1993-09-21 1995-05-09 Barnes Group, Inc. Bolt-nut assembly for railroad crossing frogs
US5456430A (en) * 1993-05-04 1995-10-10 Ortiz-Rivas; Arturo A. Frog with interchangeable insert
CZ282131B6 (cs) 1989-10-19 1997-05-14 Slévárny Třinec, A.S. Celolité těleso srdcovky
CZ6952U1 (cs) 1997-11-12 1997-12-29 Precer Trading Limited Výhybková srdcovka
CZ5698A3 (cs) 1997-01-24 1998-08-12 Krupp Fördertechnik Gmbh Způsob plně automatické nakládky a vykládky transportních jednotek, zvláště na pohybující se transportní prostředky
DE102007054213A1 (de) * 2007-11-12 2009-05-20 Schreck-Mieves Gmbh Herzstück
CN102021867A (zh) 2010-12-20 2011-04-20 中铁宝桥集团有限公司 嵌入式组合高锰钢辙叉
WO2013117325A1 (de) * 2012-02-06 2013-08-15 Voestalpine Bwg Gmbh & Co. Kg Gleisabschnitt für eine schiene sowie verfahren zur erhöhung der elastischen lagerung
CN104060503A (zh) * 2014-07-02 2014-09-24 山东远大模具材料有限公司 一种心轨、翼轨镶块采用锻造高锰钢的组合辙叉
CZ30786U1 (cs) 2016-07-21 2017-06-27 DT - Výhybkárna a strojírna, a.s. Srdcovka se zkráceným monoblokem
EP3312341A1 (de) * 2016-10-24 2018-04-25 voestalpine BWG GmbH Flügelschiene eines herzstücks sowie verfahren zum herstellen eines herzstücks

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ282131B6 (cs) 1989-10-19 1997-05-14 Slévárny Třinec, A.S. Celolité těleso srdcovky
US5456430A (en) * 1993-05-04 1995-10-10 Ortiz-Rivas; Arturo A. Frog with interchangeable insert
US5413442A (en) * 1993-09-21 1995-05-09 Barnes Group, Inc. Bolt-nut assembly for railroad crossing frogs
CZ5698A3 (cs) 1997-01-24 1998-08-12 Krupp Fördertechnik Gmbh Způsob plně automatické nakládky a vykládky transportních jednotek, zvláště na pohybující se transportní prostředky
CZ6952U1 (cs) 1997-11-12 1997-12-29 Precer Trading Limited Výhybková srdcovka
DE102007054213A1 (de) * 2007-11-12 2009-05-20 Schreck-Mieves Gmbh Herzstück
CN102021867A (zh) 2010-12-20 2011-04-20 中铁宝桥集团有限公司 嵌入式组合高锰钢辙叉
WO2013117325A1 (de) * 2012-02-06 2013-08-15 Voestalpine Bwg Gmbh & Co. Kg Gleisabschnitt für eine schiene sowie verfahren zur erhöhung der elastischen lagerung
CN104060503A (zh) * 2014-07-02 2014-09-24 山东远大模具材料有限公司 一种心轨、翼轨镶块采用锻造高锰钢的组合辙叉
CZ30786U1 (cs) 2016-07-21 2017-06-27 DT - Výhybkárna a strojírna, a.s. Srdcovka se zkráceným monoblokem
WO2018014887A1 (en) * 2016-07-21 2018-01-25 DT - Výhybkárna a strojírna, a.s. Frog with trimmed casting of a mono-block
EP3312341A1 (de) * 2016-10-24 2018-04-25 voestalpine BWG GmbH Flügelschiene eines herzstücks sowie verfahren zum herstellen eines herzstücks

Also Published As

Publication number Publication date
CZ33029U1 (cs) 2019-07-30

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