EP0749555B1 - Stoker conveyor system for heating plants - Google Patents

Stoker conveyor system for heating plants Download PDF

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Publication number
EP0749555B1
EP0749555B1 EP95909661A EP95909661A EP0749555B1 EP 0749555 B1 EP0749555 B1 EP 0749555B1 EP 95909661 A EP95909661 A EP 95909661A EP 95909661 A EP95909661 A EP 95909661A EP 0749555 B1 EP0749555 B1 EP 0749555B1
Authority
EP
European Patent Office
Prior art keywords
stoker
worm
conveyor system
arm
driving arm
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.)
Expired - Lifetime
Application number
EP95909661A
Other languages
German (de)
French (fr)
Other versions
EP0749555A1 (en
Inventor
Overdahl Pedersen Jorgen
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0749555A1 publication Critical patent/EP0749555A1/en
Application granted granted Critical
Publication of EP0749555B1 publication Critical patent/EP0749555B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus

Definitions

  • This invention relates to a stroker conveyor system according to the preamble of claim 1.
  • the present invention is especially well suited for stoker furnaces needing very high gear ratios an rapid change of gears. This may be desirable in the case og various volume/weight ratios.
  • a gear device for stoker worms for stokers is known.
  • the stoker worm is driven through a ratchet mechanism by a linked driving arm with a hinge and a hinge pin which moves in a slot the inclination of which may be varied whereby the gear ratio may be varied.
  • a friction clutch is incorporated in the gear.
  • This known gear device is complicated in its construction and therefore is expensive to manufacture. Further it has many wearing parts and the gear ratio and the change in gear ratio which is obtainable is small. By excess load the friction clutch is heated and therefore is not long-time durable.
  • the known techniques suffer the drawback that the chain is caused to break or that the motor seizes as a consequence of a possible blocking of the worm.
  • a system of simple construction which has a high gear ratio with a minimum of power loss, and which has a spring for adjustment of maximum load, and where the said spring at de same time acts as an overload safety device for the worm conveyor.
  • Claim 2 describes a preferred embodiment of an overload safety device for a stoker conveyor system according to the invention.
  • the novelty according to the invention is the use of a crank movement to pull the idling bearings which pull the worm a distance forward, and on the return stroke the worm comes to a standstill.
  • a safety arrangement in the form of a compression spring is to be used in push rotation.
  • the drive arm is prolonged so that the spring is mounted on the other side og the gear arm, which thus makes the spring function as a compression spring.
  • a rapid change in the gearing can be effected by changing the length of the drive arm, either by moving the push/pull rod into holes or infinitely variably in a slit.
  • the overload safety divice can, in principle, run endlessly without damage to vital parts.
  • the result will be a functional heating plant, which is simple of construction and has a conveyor system consisting of few components.
  • Fig. 1 shows the stoker conveyor system mounted on a fuel hopper, and which consists of an idling bearing on which is mounted a gear arm and a drive arm with an overload safety device.
  • the drive arm with the overload safety device (1) is loosely mounted on the gear change arm (2). This makes it possible to change the gearing, which will cause a change in the speed of rotation of the stoker worm body (4).
  • the gear change arm (2) is built integral with an idling bearing (3), which is mounted on the stoker worm (4) itself.
  • the whole stoker conveyor system is driven by an electric motor (5).
  • the electric motor (5) transmits the drive to the drive arm (1) via an eccentric disk (6).
  • the drive arm (1) is of a cylindrical construction with an overload spring (7), an by means of the tensioner device (8) it is possible to change the maximum load of the overload safety device.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transmission Devices (AREA)
  • Incineration Of Waste (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Solid-Fuel Combustion (AREA)
  • Furnace Details (AREA)
  • Harvesting Machines For Specific Crops (AREA)
  • Drying Of Solid Materials (AREA)
  • Attitude Control For Articles On Conveyors (AREA)
  • Paper (AREA)
  • Advancing Webs (AREA)
  • Coating Apparatus (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Control Of Conveyors (AREA)

Abstract

This invention relates to a gearing and overload safety device for use in connection with worm conveying of solid fuel. The novelty of the invention consists in a drive system for a stoker worm, which system has a high gear ratio and a minimum of power loss, and in a spring for adjustment of the maximum load, which spring simultaneously acts as an overload safety device for the stoker worm. Also, the system is of simple construction with few wearing parts.

Description

Fields of application of the invention.
This invention relates to a stroker conveyor system according to the preamble of claim 1.
The present invention is especially well suited for stoker furnaces needing very high gear ratios an rapid change of gears. This may be desirable in the case og various volume/weight ratios.
Known technique.
Existing stokers of various makes most often use af gear ratio of 600:1. The first step in the change is a worm gear with a ratio of 100:1, and then a chain gear with a ratio of 6:1. This method gives a great loss of power and a great moment.
If the worm is blocked by a foreign body the motor must stop, or possibly the safety pin is cut, or at worst the chain breaks if it is worn.
From DK, A, 48762 a gear device for stoker worms for stokers is known. The stoker worm is driven through a ratchet mechanism by a linked driving arm with a hinge and a hinge pin which moves in a slot the inclination of which may be varied whereby the gear ratio may be varied. Further a friction clutch is incorporated in the gear. This known gear device is complicated in its construction and therefore is expensive to manufacture. Further it has many wearing parts and the gear ratio and the change in gear ratio which is obtainable is small. By excess load the friction clutch is heated and therefore is not long-time durable.
From NO, A, 58078 a stoker conveyor system is known in which one type of safety pins are used.
From SE, A, 117967 a stoker conveyor system is known in which another type of safety pins are used.
The known techniques suffer the drawback that the chain is caused to break or that the motor seizes as a consequence of a possible blocking of the worm.
It is a purpose of the present invention to provide an improved stoker system. A system of simple construction, which has a high gear ratio with a minimum of power loss, and which has a spring for adjustment of maximum load, and where the said spring at de same time acts as an overload safety device for the worm conveyor.
This purpose is met thereby that a stoker conveyor system is characteristic by the subject matter of the characterizing clause of claim 1.
Claim 2 describes a preferred embodiment of an overload safety device for a stoker conveyor system according to the invention.
The new technique.
The novelty according to the invention is the use of a crank movement to pull the idling bearings which pull the worm a distance forward, and on the return stroke the worm comes to a standstill. Whether the rotation of the worm is caused by push or pull a safety arrangement in the form of a compression spring is to be used in push rotation. In the case of pull rotation the drive arm is prolonged so that the spring is mounted on the other side og the gear arm, which thus makes the spring function as a compression spring. Furthermore, a rapid change in the gearing can be effected by changing the length of the drive arm, either by moving the push/pull rod into holes or infinitely variably in a slit.
The overload safety divice can, in principle, run endlessly without damage to vital parts.
The technical effect.
By applying the above-mentioned technique the result will be a functional heating plant, which is simple of construction and has a conveyor system consisting of few components.
The invention itself and the forms of embodiment are explained below with reference to the drawing.
Figures.
  • Fig. 1 shows a fuel hopper with a stoker conveyor system.
    • Examples of embodiment.
    Fig. 1 shows the stoker conveyor system mounted on a fuel hopper, and which consists of an idling bearing on which is mounted a gear arm and a drive arm with an overload safety device.
    It will be seen that the drive arm with the overload safety device (1) is loosely mounted on the gear change arm (2). This makes it possible to change the gearing, which will cause a change in the speed of rotation of the stoker worm body (4). The gear change arm (2) is built integral with an idling bearing (3), which is mounted on the stoker worm (4) itself. The whole stoker conveyor system is driven by an electric motor (5). The electric motor (5) transmits the drive to the drive arm (1) via an eccentric disk (6).
    The drive arm (1) is of a cylindrical construction with an overload spring (7), an by means of the tensioner device (8) it is possible to change the maximum load of the overload safety device.

    Claims (2)

    1. Stoker conveyor system for heating plants which comprise a stoker worm (4) which is driven by a motor through a driving arm, characterized by the fact, that the driving arm (1) drives a gear change arm (2) which extends radially from and is integral with an idling bearing (3), which is mounted on the shaft of the stoker worm (4), and is shaped with either a longitudinal slot or with a row of holes (2') through an arbitrary of which one end of a driving arm (1) the other end of which is hinged to and driven by an eccentric disk (6) can come into a one way engagement - either push or pull - with the gear change arm (2) at a distance from the idling bearing (3) which distances can be varied and thus the gear ratio can be varied and that an overload safety device is incorporated in the driving arm (1).
    2. Stoker conveyor system according to claim 1, characterized by the fact, that the overload safety device comprise an overload spring (7) which is mounted so it can either push or pull the end of the driving arm (1) in position against the gear change arm (2) in an elected hole (2') and that the initial tension of the spring (7) can be varied by means of a tensioner device (8) which is led through a hole (2') adjoining the hole (2') with which the end of the driving arm (1) is in engagement.
    EP95909661A 1994-02-22 1995-02-22 Stoker conveyor system for heating plants Expired - Lifetime EP0749555B1 (en)

    Applications Claiming Priority (4)

    Application Number Priority Date Filing Date Title
    DK90/94 1994-02-22
    DK9400090U DK9400090U3 (en) 1994-02-22 1994-02-22 Stoker feed system for combustion plants
    DK9094 1994-02-22
    PCT/DK1995/000072 WO1995022721A1 (en) 1994-02-22 1995-02-22 Stoker conveyor system heating plants

    Publications (2)

    Publication Number Publication Date
    EP0749555A1 EP0749555A1 (en) 1996-12-27
    EP0749555B1 true EP0749555B1 (en) 2000-08-02

    Family

    ID=8154674

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP95909661A Expired - Lifetime EP0749555B1 (en) 1994-02-22 1995-02-22 Stoker conveyor system for heating plants

    Country Status (12)

    Country Link
    EP (1) EP0749555B1 (en)
    CN (1) CN2262173Y (en)
    AT (1) ATE195173T1 (en)
    AU (1) AU1806295A (en)
    DE (1) DE69518232T2 (en)
    DK (1) DK9400090U3 (en)
    EE (1) EE9600110A (en)
    FI (1) FI963295A (en)
    LV (2) LV11709A (en)
    NO (1) NO963466D0 (en)
    PL (1) PL57657Y1 (en)
    WO (1) WO1995022721A1 (en)

    Families Citing this family (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    KR100704871B1 (en) * 2005-10-31 2007-04-09 한국전력공사 Minute differential the fixed quantity feed mechanism which burns
    CN106402920A (en) * 2016-11-03 2017-02-15 新疆农业科学院农业机械化研究所 Automatic coal lifting and adding machine

    Family Cites Families (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    SE117697C1 (en) *

    Also Published As

    Publication number Publication date
    ATE195173T1 (en) 2000-08-15
    LV11709B (en) 1997-06-20
    PL105431U1 (en) 1997-01-06
    PL57657Y1 (en) 2000-02-29
    AU1806295A (en) 1995-09-04
    DE69518232T2 (en) 2001-03-15
    WO1995022721A1 (en) 1995-08-24
    FI963295A (en) 1996-10-18
    LV11709A (en) 1997-02-20
    EE9600110A (en) 1997-04-15
    FI963295A0 (en) 1996-08-23
    NO963466D0 (en) 1996-08-20
    EP0749555A1 (en) 1996-12-27
    DK9400090U3 (en) 1994-04-08
    DE69518232D1 (en) 2000-09-07
    CN2262173Y (en) 1997-09-10

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