US3630502A - Apparatus for the thermal treatment of solids - Google Patents

Apparatus for the thermal treatment of solids Download PDF

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Publication number
US3630502A
US3630502A US26989A US3630502DA US3630502A US 3630502 A US3630502 A US 3630502A US 26989 A US26989 A US 26989A US 3630502D A US3630502D A US 3630502DA US 3630502 A US3630502 A US 3630502A
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US
United States
Prior art keywords
grate
work path
speed
units
load track
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
US26989A
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English (en)
Inventor
Werner Schmidt
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.)
Dravo Corp
Original Assignee
Dravo Corp
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Publication date
Application filed by Dravo Corp filed Critical Dravo Corp
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Publication of US3630502A publication Critical patent/US3630502A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06—Endless-strand sintering machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/26—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic on endless conveyor belts

Definitions

  • An acceleration device is positioned at the end of the work path and is shaped to transfer a grate truck to the conveying device while at the same time accelerating the truck to the speed of the conveying device
  • a deceleration device positioned at the end of the conveying device transfers a grate truck to the work path while decelerating it to the work path speed.
  • the invention relates to an apparatus for the thermal treatment of solids in straight-traveling grates, where the grate units entering the no-load track through deflecting wheels are conducted back to the work path by means of conveyor devices.
  • Forms of construction of the straight traveling grates are also known where the grate trucks are emptied by tilting at the end of the upper band and rotated 180 by special devices, so that they enter the lower band with the load surface up. On the lower band the grate trucks are then again charged with the material discharged from the upper band, so that a heat treatment of the material occurs also on the lower band. After completion of this second heat treatment, the grate trucks are emptied, rotated 180, and returned to the upper band.
  • This type can also operate so that the first heat treatment occurs on the lower band and the second heat treatment on the upper band, it being then necessary to convey the material into the charging device for the upper band by adequate transport devices.
  • a method different from the above-cited state of the art for improving traveling grates provides passing the grate units, supplied by the lowering wheel to the lower band, to the lifting wheel by means of a conveying device. The return then occurs at a speed which is much greater than the speed of the grate units on the working track.
  • the transfer of the grate units from the working belt to the no-load track occurs preferably with gear wheels which seize the grate units by rolls mounted on the shaft, transporting them so that in the descent they do not touch the preceding or following grate unit.
  • the grate unit is seized by drive pins of a conveying device, e.g., two endless chains running parallel, and are taken along at a speed about lO-l5 times greater (referred to that of the working track).
  • a conveying device e.g., two endless chains running parallel
  • This invention avoids the above-mentioned disadvantages. It relates to an apparatus for the thermal treatment of solids on straight traveling grates where the grate units entering the no load track through deflecting wheels are guided back from the beginning to the end of the no-load track, with the aid of conveying devices at a much greater speed than that which they have during the thermal treatment, and is characterized by a device which accelerates the grate unit at the end of the work belt for transfer to the conveying device from working speed to return speed, and a device which decelerates the grate unit at the end of the no-load track for transfer to the work track from return speed to work speed.
  • the devices for acceleration and deceleration of the speed of the grate units have preferably the form of levers or else of specially shaped cam plates mounted in pairs on a shaft.
  • the acceleration or deceleration of the grate units can be achieved in that the rotary shaft of the levers itself executes an accelerated or decelerated movement.
  • the lever pairs, as well as the cam plates are mounted on a shaft suspended outside the center of circle defined by the deflection path, so that at constant rotary movement of the shaft the acceleration or deceleration of the grate units is attained due to the varying circumferential speed of the contact points between the rolls of the grate units and the levers or cam plates.
  • the upper band of the traveling grate may be designed as working belt and the lower band as no-load belt, or the upper band may be designed as no-load belt and the lower band as working belt.
  • Synchronism is provided between the conveying device and the device for the transfer of the grate units to the working belt.
  • a simple possibility suitable for this consists in that the conveying device and device for the transfer of the grate units are driven by means of the same assembly and that difierent speeds are brought about by different transmission ratios.
  • FIG. 1 is a side elevation, partly in schematic, of a traveling grate where the work path is arranged in the upper band and the no-load track in the lower band. Also shown are devices in accordance with the present invention for accelerating and decelerating the grate units, such devices being shown as specially designed levers.
  • FIG. 2 is a side elevation view, partly in schematic, of a traveling grate where the work path is arranged in the lower band and the no-load track in the upper band. Also shown are devices in accordance with the present invention for accelerating and decelerating the grate units.
  • FIG. 3 is a side elevation view, partly in schematic, of a traveling grate where the work path is arranged in the upper band and the no-load track in the lower band. Also shown are cam devices in accordance with the present invention for accelerating and decelerating the grate units.
  • FIG. 4 is a side elevation view, partly in schematic, of a traveling grate where the work path is arranged in the lower and the no-load track in the upper band. Also shown are cam devices in accordance with the present invention for accelerating and decelerating the grate units.
  • grate trucks 2 traverse the sintering path arranged in the upper band of the sintering machine I.
  • the drive occurs through a driving wheel or wheel pair 3, which engages in the rolls 4 disposed on the axles of the grate trucks 2.
  • the first grate truck is seized by the device 5 designed as a lever, separated from the grate truck chain, and accelerated on the deflection track 6 from working speed to the speed corresponding to the conveying device 7.
  • the design of lever 5 and of the grate truck axles by rolls 4 is such that an acceleration of the grate truck beyond the intended speed due to gravitation cannot take place.
  • the arm of lever 5 may be designed widened toward the pivot, so that at the point of the deflection track 6 at which the gravitational forces would cause an acceleration beyond the desired speed the distance between front and rear rolls 4 is practically filled by the lever 5 and thus absolute positive conduction of the grate truck exists.
  • the grate truck having arrived on the no-load track 8, is seized by the drive pin 9 at the roll 4 and dragged on the no-load track at practically constant speed, which may be about lO-l5 times the speed of the trucks on the sintering path. At the end thereof, the grate truck is transferred to lever 10, whose circumferential speed at the takeup point of the grate truck is practically identical with the return speed thereof.
  • Wheel 12 has a separating function, i.e., it is to prevent that due to inevitable differences in tensile strength of the sinter, two or even more grate trucks are pulled off by the lever S at the individual abutment points of the grate trucks.
  • the separating wheel 12 may be unnecessary if, for example, pellets are fired or if the device according to the invention is applied to processes where large area intercrescence of the charge is not to be expected. Then, however, provision must be made by suitable measures, e.g., by inclination of the work track, that the cohesion of the individual grate units is preserved.
  • FIG. 2 differs from that of FIG. I by interchange of the position of the work belt and of the no-load track.
  • the various shapes, configurations, and parts of the apparatus correspond to those explained in reference to FIG. 1.
  • the form of a fork 10 is advisable for the device for transferring the grate truck to the conveyor.
  • cam plates 13 and 14 having specially arranged guide strips 15 and 16, take over the function of the levers 5 and 10.
  • the use of the cam plates 13 and 14 as devices for the acceleration or deceleration of the speed of the grate trucks 2 involves the advantage that the drive wheel 3 (as per FIG. 1 or 2) and the separating wheel (as per FIG. 1 or 2) can be dispensed with. Because of the shape of their flanks, the cam plates 13 and 14 also take over the driving and separating function.
  • only one roll or respectively one roll pair 4 is required at the front axle of the grate truck.
  • the working track is in the lower band and the no-load track 8 with conveying device 7 in the upper hand of the traveling grate.
  • the function of the cam plates 13 and 14 corresponds to that described in FIG. 3. In this case the guide strips 15 and 16 (as per FIG. 3) are not necessary.
  • the apparatus according to the invention for the thermal treatment of solids is applicable to the sintering of ores and ore concentrates, to the firing of pellets of any origin, to the calcining of any substances, and to drying and cooling processes.
  • Apparatus for use in the thermal treatment of solids comprising:
  • no-load track means for carrying empty units back to the work path at a speed greater than the work speed
  • first elongated revolvable transfer means arranged at the discharge end of the work path for engaging and transferring the grate units from the work path to the no-load track means and for accelerating the units to the no-load track speed;
  • second elongated revolvable transfer means arranged at the feed end of the work path for engaging and transferring the grate units from the no-load track means to the work path and for decelerating the units to the work path speed.
  • said first transfer means includes a rotatable lever member arranged at the end portion of the work path and shaped to engage a grate unit to guide same onto the no-load track; and said second transfer means includes a rotatable lever member arranged at the beginning portion of the work path and shaped to engage a grate unit to guide same onto the work path.
  • said first transfer means includes a rotatable cam member arranged at the end portion of the work path and shaped to engage a grate unit to guide same onto the no-load track; and said second transfer means includes a cam member arranged at the beginning portion of the work path and shaped to engage a grate unit to guide same onto the work path.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Belt Conveyors (AREA)
US26989A 1969-04-18 1970-04-09 Apparatus for the thermal treatment of solids Expired - Lifetime US3630502A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691919668 DE1919668A1 (de) 1969-04-18 1969-04-18 Vorrichtung zur thermischen Behandlung fester Stoffe

Publications (1)

Publication Number Publication Date
US3630502A true US3630502A (en) 1971-12-28

Family

ID=5731548

Family Applications (1)

Application Number Title Priority Date Filing Date
US26989A Expired - Lifetime US3630502A (en) 1969-04-18 1970-04-09 Apparatus for the thermal treatment of solids

Country Status (8)

Country Link
US (1) US3630502A (enrdf_load_stackoverflow)
JP (1) JPS5020930B1 (enrdf_load_stackoverflow)
BE (1) BE749155A (enrdf_load_stackoverflow)
DE (1) DE1919668A1 (enrdf_load_stackoverflow)
FR (1) FR2038017A5 (enrdf_load_stackoverflow)
GB (1) GB1265607A (enrdf_load_stackoverflow)
LU (1) LU60737A1 (enrdf_load_stackoverflow)
NL (1) NL7005469A (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925907A (en) * 1973-10-10 1975-12-16 Polysius Ag Process and apparatus for cooling of fired or sintered material
US4164997A (en) * 1977-02-02 1979-08-21 Owens-Illinois, Inc. Article transport device and method
US4613034A (en) * 1984-07-10 1986-09-23 Nippondenso Co., Ltd. Apparatus for conveying corrugated members
US4757893A (en) * 1987-04-06 1988-07-19 Shabram Jr Lyle F Apparatus for positively spacing attached devices along a moving timing chain
US5139131A (en) * 1990-09-26 1992-08-18 Tetra Pak Holdings S.A. Conveyor installation for workpiece carriers
US5409103A (en) * 1992-10-16 1995-04-25 Tetra Laval Holdings & Finance S.A. Conveyance device having a line of members
US6086802A (en) * 1998-04-16 2000-07-11 Sapsa Bedding S.P.A. Process and plant for manufacture of latex foam products
US6152288A (en) * 1997-03-20 2000-11-28 Mannesmann Dematic Rapistan Corp. High volume storage system with power and free drive
US6312244B1 (en) 1998-04-16 2001-11-06 Sapsa Bedding Spa Plant for manufacture of foam products
US6766898B2 (en) * 2001-09-07 2004-07-27 Claude Lessard Surface conveyor with variable delivery rate for bagging bakery products
US20050040012A1 (en) * 2003-08-08 2005-02-24 Hsi-Fa Chuang Footwear article conveyer
US20080289931A1 (en) * 2007-05-25 2008-11-27 Josef Veile Apparatus for transporting containers to at least one processing station

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3804593C1 (enrdf_load_stackoverflow) * 1987-03-07 1989-06-08 Schott Glaswerke, 6500 Mainz, De
RU2057406C1 (ru) * 1995-10-13 1996-03-27 Закрытое акционерное общество "Тройлер-корпорация" Способ получения карбида кальция

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3329419A (en) * 1963-11-08 1967-07-04 Corson G & W H Moving pallet sintering apparatus and method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3329419A (en) * 1963-11-08 1967-07-04 Corson G & W H Moving pallet sintering apparatus and method

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925907A (en) * 1973-10-10 1975-12-16 Polysius Ag Process and apparatus for cooling of fired or sintered material
US4164997A (en) * 1977-02-02 1979-08-21 Owens-Illinois, Inc. Article transport device and method
US4613034A (en) * 1984-07-10 1986-09-23 Nippondenso Co., Ltd. Apparatus for conveying corrugated members
US4757893A (en) * 1987-04-06 1988-07-19 Shabram Jr Lyle F Apparatus for positively spacing attached devices along a moving timing chain
US5139131A (en) * 1990-09-26 1992-08-18 Tetra Pak Holdings S.A. Conveyor installation for workpiece carriers
US5409103A (en) * 1992-10-16 1995-04-25 Tetra Laval Holdings & Finance S.A. Conveyance device having a line of members
US6152288A (en) * 1997-03-20 2000-11-28 Mannesmann Dematic Rapistan Corp. High volume storage system with power and free drive
US6086802A (en) * 1998-04-16 2000-07-11 Sapsa Bedding S.P.A. Process and plant for manufacture of latex foam products
US6312244B1 (en) 1998-04-16 2001-11-06 Sapsa Bedding Spa Plant for manufacture of foam products
US6766898B2 (en) * 2001-09-07 2004-07-27 Claude Lessard Surface conveyor with variable delivery rate for bagging bakery products
US20050040012A1 (en) * 2003-08-08 2005-02-24 Hsi-Fa Chuang Footwear article conveyer
US6923310B2 (en) * 2003-08-08 2005-08-02 Hsi-Fa Chuang Footwear article conveyer
US20080289931A1 (en) * 2007-05-25 2008-11-27 Josef Veile Apparatus for transporting containers to at least one processing station
US7677384B2 (en) * 2007-05-25 2010-03-16 Groninger & Co. Gmbh Apparatus for transporting containers to at least one processing station

Also Published As

Publication number Publication date
NL7005469A (enrdf_load_stackoverflow) 1970-10-20
GB1265607A (enrdf_load_stackoverflow) 1972-03-01
FR2038017A5 (enrdf_load_stackoverflow) 1970-12-31
BE749155A (fr) 1970-10-01
DE1919668A1 (de) 1970-11-05
LU60737A1 (enrdf_load_stackoverflow) 1970-06-17
JPS5020930B1 (enrdf_load_stackoverflow) 1975-07-18

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