EP1577443A1 - Poutre vibrante pour finisseuse de route - Google Patents

Poutre vibrante pour finisseuse de route Download PDF

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Publication number
EP1577443A1
EP1577443A1 EP04006487A EP04006487A EP1577443A1 EP 1577443 A1 EP1577443 A1 EP 1577443A1 EP 04006487 A EP04006487 A EP 04006487A EP 04006487 A EP04006487 A EP 04006487A EP 1577443 A1 EP1577443 A1 EP 1577443A1
Authority
EP
European Patent Office
Prior art keywords
screed
assembly
controllably
electrical
time period
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Withdrawn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
EP04006487A
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German (de)
English (en)
Inventor
Marco Gerardo
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.)
Caterpillar Prodotti Stradali SRL
Original Assignee
Bitelli SpA
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 Bitelli SpA filed Critical Bitelli SpA
Priority to EP04006487A priority Critical patent/EP1577443A1/fr
Publication of EP1577443A1 publication Critical patent/EP1577443A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/30—Tamping or vibrating apparatus other than rollers ; Devices for ramming individual paving elements
    • E01C19/34—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight
    • E01C19/40—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C2301/00—Machine characteristics, parts or accessories not otherwise provided for
    • E01C2301/10—Heated screeds
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C2301/00—Machine characteristics, parts or accessories not otherwise provided for
    • E01C2301/14—Extendable screeds

Definitions

  • the present invention relates to paving machines having screed assemblies and, more particularly, to paving screed assemblies having associated oscillatory mechanisms.
  • Paving machines are used for depositing, spreading, compacting, and smoothing a paving material on a roadbed in such a manner that a uniform and drivable surface is produced.
  • the paving material is typically an aggregate filled bituminous mixture that is deposited while hot on a roadbed. Once the mixture cools, after being suitably compacted and smoothed, a hardened pavement surface results.
  • the service life of a pavement depends significantly upon the successful reduction of voids in the bituminous mixture.
  • the process of compaction of the asphalt layer or mat controls and minimizes voids in the material.
  • Paving machines use screed assemblies to smooth and compact the paving material.
  • the screed assembly is typically drawn behind the paving machine, and is adjustable to establish the thickness of the deposited layer of paving material.
  • a screed assembly typically includes main and may include auxiliary screed portions.
  • Each screed portion typically has at least one steel screed plate mounted to the screed portion in such a manner that the plates smooth and compress the deposited paving material, leaving behind a mat of the desired thickness.
  • the screed plates are often heated, typically using gas-fired burners, to prevent the bituminous material from clinging to the steel plates and to produce a desired finish on the pavement. It is also known and becoming more common to use electrical resistance heaters instead of gas fired burners to heat the screed plates.
  • a typical vibratory screed may be represented by US patent 5,868,522 issued to Campbell.
  • the Campbell system uses a motor driven shaft attached in a linear manner via a plurality of bearing journals to each of the multiplicity of screed plates in a screed assembly. Eccentric weights mounted on the shaft cause the shaft and, indirectly, each of the screed plates to vibrate when the shaft is rotated by the motor.
  • the tamper bars may be reciprocated vertically in a manner similar to the vibration of the screed plates, using a linear shaft commonly mounted to the plurality of tamper bars.
  • Motor driven linear vibrator and reciprocator shafts are bulky, difficult to optimally position in the tight confines of a screed assembly, and are not readily adapted to apply a controlled motion to the most advantageous location on a screed plate or tamper bar because the shaft can only be positioned in a linear manner on the respective device.
  • Screed and tamper bar heating units using natural gas burners disposed about the screed assembly require a network of tubing both within the screed assembly and between the screed assembly and a source of combustible fuel, typically carried under pressure in a tank on the paving machine. The fuel supply also must be replenished frequently.
  • Screed and tamper bar shafts that are rotationally driven by hydraulic motors as is typical because pressurized hydraulic fluid is commonly available on paving machines, also require the provision of high-pressure hydraulic plumbing within the screed assembly and between the screed assembly and the paving machine proper.
  • a hydraulic pump and control system of suitable capacity must also be carried by the paving machine. Electrical heater assemblies and electric motors may be advantageously employed to avoid the disadvantages of combustible fuel and hydraulic systems, but normally require the availability of a high capacity electric power system.
  • the present invention is directed to overcoming one or more of the problems set forth above.
  • a screed assembly for a paving machine includes at least one screed plate and a respective electrically actuated vibratory unit associated with and positioned relative to the screed plate at a location sufficient to controllably vibrate the screed plate.
  • the vibratory unit is a self-contained vibratory system having an electric motor driving a rotating mass.
  • a paving machine in a second aspect of the present invention, includes an engine coupled to a system for producing electrical power.
  • the machine includes a screed assembly having at least one screed plate.
  • An electrical heater assembly is associated with and positioned at a location sufficient to controllably heat at least a portion of the screed plate, and an electrically actuated vibratory unit is associated with and positioned at a location sufficient to controllably vibrate the screed plate.
  • the electrically actuated vibratory unit is a self-contained vibratory system having an electric motor driving a rotating mass, and the heating element and vibratory units are controllably connectable to the system for producing electrical power.
  • a method for providing an electrical screed assembly for a paving machine.
  • the screed assembly includes a screed plate and the paving machine includes an electrical power source.
  • the method comprises the steps of positioning at least one electrical heater assembly and an electrically actuated vibratory unit in proximity to the screed plate.
  • the heater assembly is controllably connectable to the electric power source during a preheat time period while the electrical vibratory unit is disconnected from the power source, and both the heater assembly and the vibratory unit is connected to the power source during at least a portion of an operational time period.
  • a paving machine 10 having an attached screed assembly 14.
  • the screed assembly 14 may be connected to the paving machine 10 via draw bars 18 or in other conventional manners known in the art.
  • the screed assembly 14 may be a single fixed-width assembly, or may be separated into left and right side units. Such split screed assemblies are advantageously used to form road surfaces having special characteristics such as a crowned center.
  • each screed assembly portion may include one or more auxiliary or extension portions permitting adjustment of the paving width as desired.
  • the screed assembly 14 has at least one screed plate 22.
  • the screed assembly 14 includes first and second main screed portions 46, 50, and first and second auxiliary screed portions 54, 58. Each screed portion includes a respective screed plate 22.
  • An electrically actuated vibratory unit 26 is associated with and positioned relative to each screed plate 22 at a location sufficient to controllably vibrate the screed plate 22.
  • the vibratory unit 26 is a self-contained vibratory system having an electric motor 30 driving a rotating mass 34.
  • both of the motor 30 and mass 34 are contained within a single enclosure 42.
  • the vibratory units 26 may be mounted to the screed plates 22 with mounting flanges 38. To reduce the bearing load on the motor 30, the mass 34 may be divided on opposite ends of the motor shaft and may be rotationally adjustable on the shaft.
  • Self contained vibratory units of such a construction are commercially available, for example from Italvibras SpA, Sassuolo, Italy.
  • the screed assembly 14 includes first and second main screed portions 46, 50, each having a respective screed plate 22 and electrically actuated vibratory unit 26 associated with and positioned relative to the respective screed plate 22 at a location sufficient to controllably vibrate the screed plate 22.
  • the screed assembly 14 may also include first and second auxiliary screed portions 54, 58, extendable from respective ones of the first and second main screed portions 46, 50.
  • Each of the auxiliary screed portions 54, 58 also has a respective screed plate 22 and electrically actuated vibratory unit 26 associated with and positioned relative to the respective screed plate 22 at a location sufficient to controllably vibrate the respective screed plate 22.
  • the screed assembly 14 may also include a respective tamper bar 62 associated with each included screed portion 46, 50, 54, 58.
  • Each tamper bar 62 has an electrically actuated eccentric drive unit 28 operatively associated with and positioned relative to the respective tamper bar 62 at a location sufficient to controllably reciprocate the tamper bar 62.
  • the eccentric drive units 28 are preferably discrete electric motor drive eccentric shaft devices, and may be connected to the tamper bars 62 with connecting links 40. Consequently, each included screed plate 22 and tamper bar 62 in a given screed assembly 14 may have an associated respective vibratory or eccentric drive unit 26, 28 mounted thereon.
  • the screed plates 22 and tamper bars 62 may also include respective electrically powered heater assemblies 66 positioned at locations sufficient to controllably heat at least a portion of the associated screed plate 22 or tamper bar 62.
  • the paving machine 10 and screed assembly 14 includes an electrical power source 70.
  • Each of the electrically actuated vibratory and eccentric drive units 26, 28 and the electrically powered heater assemblies 66 are connectable to and controllably and commonly powered by the electrical power source 70.
  • At least one of the frequency and amplitude of vibration produced by the electrically actuated vibratory units 22 and the frequency of tamper bar motion produced by the electrically actuated eccentric drive units 28 may be controllably variable in response to the power supplied by the electrical power source 70.
  • the electrical power source 70 includes an electrical generator 74 configured with appropriate control and power conditioning circuitry sufficient to produce the magnitude and type of electrical power required by the selected electrical heater assemblies 66 and electrically actuated vibratory and eccentric drive units 26, 28.
  • the generator 74 is typically driven by a combustion engine 82 associated with the paving machine 10.
  • the electrical power source 70 controllably delivers power to the heater assemblies 66 during both a preheat time period and an operational time period, and controllably delivers power to the electrically actuated vibratory and eccentric drive units 26, 28 only during the operational period and not during the preheat period.
  • a screed assembly 14 for a paving machine 10 may be relatively simple having only a single portion containing a single screed plate 22, or may be more complex.
  • the screed assembly 14 may have both first and second main screed portions 46, 50 and first and second auxiliary screed portions 54, 58.
  • each screed portion will include a respective screed plate 22 and may or may not include a respective tamper bar 62. It is desirable to heat the screed plates 22 and, under some conditions, the tamper bars 62 to prevent paving material from clinging to them, and it is desirable to vibrate the screed plates 22 and, if present, to reciprocate the tamper bars 62, to compact the paving material to produce a firm road surface.
  • each screed plate 22 includes a discrete associated electrically actuated vibratory unit 26 that is positioned relative to the respective screed plate 22 at a location sufficient to controllably vibrate the associated screed plate 22.
  • Each vibratory unit 26 is self-contained and can be positioned for optimal vibration of the respective screed plate 22.
  • each tamper bar 62 may have an electrically actuated eccentric drive unit 28 associated with and positioned relative to the tamper bar 62 at a location sufficient to controllably reciprocate the respective tamper bar 62.
  • the drive units 28 associated with the tamper bars 62 are of a similar self-contained construction to those associated with the screed plates 22, although they might differ in certain design characteristics such as size and shape.
  • the overall required electrical generating capacity of the electric power source 70 can be minimized by controlling the times during which power is supplied to the electrical heater assemblies 66 and the electrically actuated vibratory and eccentric drive units 26, 28.
  • This opportunity is available because the screed plates 22 and tamper bars 62 are generally preheated before using the screed assembly 14 with hot paving material. After such preheating and once the screed assembly 14 is being operated with hot material, very little, if any, additional heat need be applied to the screed plates 22 and tamper bars 62. Therefore, most of the electrical power required by the electrical heater assemblies 66 is during a preheat stage of operation.
  • the electrical heater assemblies 66 are connected to the electric power source 70 during a preheat time period, and the electrical vibratory and drive units 26, 28 are not supplied with power during this time.
  • the heater assemblies 66 are either disconnected or are connected only for brief periods of time, while the units 26, 28 are in operation. Therefore, by avoiding or minimizing the need to apply full electrical power to both the electrical heater assemblies 66 and the vibratory and drive units 26, 28 simultaneously, the overall required power capacity of the electrical power source 70 is advantageously minimized.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
EP04006487A 2004-03-18 2004-03-18 Poutre vibrante pour finisseuse de route Withdrawn EP1577443A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04006487A EP1577443A1 (fr) 2004-03-18 2004-03-18 Poutre vibrante pour finisseuse de route

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04006487A EP1577443A1 (fr) 2004-03-18 2004-03-18 Poutre vibrante pour finisseuse de route

Publications (1)

Publication Number Publication Date
EP1577443A1 true EP1577443A1 (fr) 2005-09-21

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EP04006487A Withdrawn EP1577443A1 (fr) 2004-03-18 2004-03-18 Poutre vibrante pour finisseuse de route

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015179078A1 (fr) * 2014-05-20 2015-11-26 Caterpillar Inc. Système de vibration de poutre égaliseuse
US9267246B2 (en) 2014-05-20 2016-02-23 Caterpillar Paving Products Inc. Paving machine having vibration-isolated screed assembly
CN107905067A (zh) * 2017-11-02 2018-04-13 郑州航空工业管理学院 一种市政柏油路面热压平装置
US10889944B2 (en) 2018-08-28 2021-01-12 Caterpillar Paving Products Inc. Control system for controlling operation of compaction systems of a paving machine
DE102022133090A1 (de) 2022-12-13 2024-06-13 Dynapac Gmbh Straßenfertiger, Einbaubohle für einen Straßenfertiger und Verfahren zum Betreiben eines Straßenfertigers

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2346379A (en) * 1941-07-23 1944-04-11 Jackson Corwill Method of and apparatus for placing pavement slabs and the like
EP0489969A1 (fr) * 1990-12-14 1992-06-17 Joseph Vögele AG Finisseuse
EP0560360A2 (fr) * 1992-03-13 1993-09-15 Caterpillar Paving Products Inc. Règle pour finisseuse
JPH08105012A (ja) * 1994-10-06 1996-04-23 Sumitomo Constr Mach Co Ltd スクリードの振動装置
EP1258564A2 (fr) * 2001-05-14 2002-11-20 Caterpillar Inc. Poutre dameuse avec mécanisme de commande automatique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2346379A (en) * 1941-07-23 1944-04-11 Jackson Corwill Method of and apparatus for placing pavement slabs and the like
EP0489969A1 (fr) * 1990-12-14 1992-06-17 Joseph Vögele AG Finisseuse
EP0560360A2 (fr) * 1992-03-13 1993-09-15 Caterpillar Paving Products Inc. Règle pour finisseuse
JPH08105012A (ja) * 1994-10-06 1996-04-23 Sumitomo Constr Mach Co Ltd スクリードの振動装置
EP1258564A2 (fr) * 2001-05-14 2002-11-20 Caterpillar Inc. Poutre dameuse avec mécanisme de commande automatique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 08 30 August 1996 (1996-08-30) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015179078A1 (fr) * 2014-05-20 2015-11-26 Caterpillar Inc. Système de vibration de poutre égaliseuse
US9267246B2 (en) 2014-05-20 2016-02-23 Caterpillar Paving Products Inc. Paving machine having vibration-isolated screed assembly
CN107905067A (zh) * 2017-11-02 2018-04-13 郑州航空工业管理学院 一种市政柏油路面热压平装置
CN107905067B (zh) * 2017-11-02 2019-11-22 中商建投建设有限公司 一种市政柏油路面热压平装置
US10889944B2 (en) 2018-08-28 2021-01-12 Caterpillar Paving Products Inc. Control system for controlling operation of compaction systems of a paving machine
DE102022133090A1 (de) 2022-12-13 2024-06-13 Dynapac Gmbh Straßenfertiger, Einbaubohle für einen Straßenfertiger und Verfahren zum Betreiben eines Straßenfertigers

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