CA1044169A - Roller conveyor - Google Patents
Roller conveyorInfo
- Publication number
- CA1044169A CA1044169A CA244,781A CA244781A CA1044169A CA 1044169 A CA1044169 A CA 1044169A CA 244781 A CA244781 A CA 244781A CA 1044169 A CA1044169 A CA 1044169A
- Authority
- CA
- Canada
- Prior art keywords
- rollers
- pairs
- roller
- locations
- pair
- 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
Links
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
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
- F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)
- F27B9/2423—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace) the charge rotating about an axis parallel to the axis of advancement of the charge
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Rollers For Roller Conveyors For Transfer (AREA)
Abstract
ABSTRACT
The invention provides a roller conveyor for transporting larger diameter tubular stock through a furnace in a plant for heating large diameter tubes. the conveyor has a plurality of spaced roller pairs, at least one of which in the region of the end of the conveyor is a twin pair of rollers of which at least one pair is resiliently mounted.
The invention provides a roller conveyor for transporting larger diameter tubular stock through a furnace in a plant for heating large diameter tubes. the conveyor has a plurality of spaced roller pairs, at least one of which in the region of the end of the conveyor is a twin pair of rollers of which at least one pair is resiliently mounted.
Description
This invention relates to a roller conveyor for trans-porting large diameter tubuiar stock through a furnace in a plant for heat treating large diameter tubes, the conveyor being of the kind comprising a plurality of pairs of rollers which are relat-ively spaced apart by a distance correspondlng approximately to one quarter of the normal tube length.
~ For heat treating large diameter tubes, the tubes are generally heated up to a temperature of lOOO~C e.g. in a gas-fired furnace.
It has been found to be disadvantageous that in the .~, . .
course o the heating up phase of such treatment the stock tends -' to be damaged by the last roller in the furnace. ~his damage, which takes the form of groove-like impressions formed in the tube walls, occurs in consequence of the reduced strength of the tube material in the region of the last roller under the influ-. ' . - .:, ence of the maximum temperature level achieved in this region, . ~
` as well as in consequence o~ the load stresses ap~lieA to .ne .. . .
~1 tube walls by the projecting ends of the tube.
.. . .
!:,, . It is not possible to reduce the furnace temperature :1 20 because this depends on the ~ature of the proposed heat treatment 1 and cannot be varied at will.
It is therefore the aim of this invention io provide an im?roved roller conveyor ln which such potential damage to the tube walls is minimized or avoided:
3~
:,~ . . . :
~ 2- .
According to the present invention there is provided a roller track for feeding pipes through a tempering furnace comprising a plurality of pipe supporting locations substant-ially equally spaced along the track, most of said locations comprising a single pair of rollers particularly spaced trans-versely in relation to the track, at least one of said locations adjacent a zone of maximum heating of the pipe in the furnace ,~
comprising two pairs of transversely spaced rollers mounted side by side along the tracks, the latter two pairs being spaced apart by a distance which is less than the spacing of the locations, and one of the pair of rollers of said latter .
two pairs being resiliently mounted. ;~
Preferably the elastic constant is adjustable in ~ ~ -accordance with the weight of the tuhe. In a preferred form of execution two successive pairs of rollers are resiliently mounted on lever arms with adjustable resilient elements whereas f~ fixedly mounted rollers are provided forwardly of, and behind ~ . . .
the said resilient roller pairs.
,1 The adjustable resilience is preferably obtained by hydraulic means. I the bearing pressure is selected in accordance with the prevailing metre-weight of the tubular materlal, the resiliently mounted rollers will take up a portion of the bearing load and distribute lt across a wider area. -~
By virtue of the provisions of this invention it i5 ~: -possible to avoid the hitherto customary impressions in, and damage to the tube walls.
The lnvention will now~be~described, by way of example, with reference to the accompanying diagrammatic drawings wherein:~
Pigure 1 is an elevation of one embodiment of the 30 ~ roller conveyor to the invention, and Figure 2 is a plan view o~ the conveyor of Figure 1.
- ,~ : . ... .
, ,, ~ :: , A -~ ~
. u~ . ~ , ..
~4416~3 :~
! The furnace is represented in diagra~atic fashion in the drawings and designated 6. The roller conveyor e~tends through the furnace and only the portion preceding the furnace lS
~ shown in Figure 2.
As viewed in the direction of conveying, this roller :
con~eyor~ as.:is customary, comprises a plurality of successively . arranged and fixed pairs of rollers 4. As provided by this .~ inyention r one pair of rollers in the region of the end of the conveyor is replaced by a twin pair of rollers 1. The term . :
: "t~in pair of rollers" as used herein refers to an arrangement : wherein the distance between successive rollers 1,1 (viewed in ~ the direction of conveying) does not correspond to approximately ~ one quarter of the normal tube length, as is the case with the ! ~ . .
rollers 4, but is substantially shorter.~ :
At least one of these roller palrs 1 is resiliently mounted... In the illustrated example both pairs of rollers 1 are ' mounted resiliently, namely on lever arms 2 which are in thelr ; ~ turn supported by the resilient elements 3. Tne resllient~ ~
~: elements 3 are adjustable to suit the metre-weight::of the tubes.
'~ ~? ~ As may be cleariy observed from:Figure 2,1the roller : ' '' '.
. pairs 4 which are situated~forwardly of,~and'behlnd~the twLn~
roller pair l,l, viewed in the~directlon of conveying, are~
.1 , mounted in:non-resilient manner:in the conveyor.
The roller conveyor of the invention effectively I ~
revents the aforesaid damage to the tube wallsl, and~more part- .' '' :
icularly,~it~does thls:'~without any~significant constructional ou~lay.~
. ., , . ... ., . ,. . . . . . -
~ For heat treating large diameter tubes, the tubes are generally heated up to a temperature of lOOO~C e.g. in a gas-fired furnace.
It has been found to be disadvantageous that in the .~, . .
course o the heating up phase of such treatment the stock tends -' to be damaged by the last roller in the furnace. ~his damage, which takes the form of groove-like impressions formed in the tube walls, occurs in consequence of the reduced strength of the tube material in the region of the last roller under the influ-. ' . - .:, ence of the maximum temperature level achieved in this region, . ~
` as well as in consequence o~ the load stresses ap~lieA to .ne .. . .
~1 tube walls by the projecting ends of the tube.
.. . .
!:,, . It is not possible to reduce the furnace temperature :1 20 because this depends on the ~ature of the proposed heat treatment 1 and cannot be varied at will.
It is therefore the aim of this invention io provide an im?roved roller conveyor ln which such potential damage to the tube walls is minimized or avoided:
3~
:,~ . . . :
~ 2- .
According to the present invention there is provided a roller track for feeding pipes through a tempering furnace comprising a plurality of pipe supporting locations substant-ially equally spaced along the track, most of said locations comprising a single pair of rollers particularly spaced trans-versely in relation to the track, at least one of said locations adjacent a zone of maximum heating of the pipe in the furnace ,~
comprising two pairs of transversely spaced rollers mounted side by side along the tracks, the latter two pairs being spaced apart by a distance which is less than the spacing of the locations, and one of the pair of rollers of said latter .
two pairs being resiliently mounted. ;~
Preferably the elastic constant is adjustable in ~ ~ -accordance with the weight of the tuhe. In a preferred form of execution two successive pairs of rollers are resiliently mounted on lever arms with adjustable resilient elements whereas f~ fixedly mounted rollers are provided forwardly of, and behind ~ . . .
the said resilient roller pairs.
,1 The adjustable resilience is preferably obtained by hydraulic means. I the bearing pressure is selected in accordance with the prevailing metre-weight of the tubular materlal, the resiliently mounted rollers will take up a portion of the bearing load and distribute lt across a wider area. -~
By virtue of the provisions of this invention it i5 ~: -possible to avoid the hitherto customary impressions in, and damage to the tube walls.
The lnvention will now~be~described, by way of example, with reference to the accompanying diagrammatic drawings wherein:~
Pigure 1 is an elevation of one embodiment of the 30 ~ roller conveyor to the invention, and Figure 2 is a plan view o~ the conveyor of Figure 1.
- ,~ : . ... .
, ,, ~ :: , A -~ ~
. u~ . ~ , ..
~4416~3 :~
! The furnace is represented in diagra~atic fashion in the drawings and designated 6. The roller conveyor e~tends through the furnace and only the portion preceding the furnace lS
~ shown in Figure 2.
As viewed in the direction of conveying, this roller :
con~eyor~ as.:is customary, comprises a plurality of successively . arranged and fixed pairs of rollers 4. As provided by this .~ inyention r one pair of rollers in the region of the end of the conveyor is replaced by a twin pair of rollers 1. The term . :
: "t~in pair of rollers" as used herein refers to an arrangement : wherein the distance between successive rollers 1,1 (viewed in ~ the direction of conveying) does not correspond to approximately ~ one quarter of the normal tube length, as is the case with the ! ~ . .
rollers 4, but is substantially shorter.~ :
At least one of these roller palrs 1 is resiliently mounted... In the illustrated example both pairs of rollers 1 are ' mounted resiliently, namely on lever arms 2 which are in thelr ; ~ turn supported by the resilient elements 3. Tne resllient~ ~
~: elements 3 are adjustable to suit the metre-weight::of the tubes.
'~ ~? ~ As may be cleariy observed from:Figure 2,1the roller : ' '' '.
. pairs 4 which are situated~forwardly of,~and'behlnd~the twLn~
roller pair l,l, viewed in the~directlon of conveying, are~
.1 , mounted in:non-resilient manner:in the conveyor.
The roller conveyor of the invention effectively I ~
revents the aforesaid damage to the tube wallsl, and~more part- .' '' :
icularly,~it~does thls:'~without any~significant constructional ou~lay.~
. ., , . ... ., . ,. . . . . . -
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A roller track for feeding pipes through a temper-ing furnace comprising a plurality of pipe supporting locations substantially equally spaced along the track, most of said locations comprising a single pair of rollers particularly spaced transversely in relation to the track, at least one of said locations adjacent a zone of maximum heating of the pipe in the furnace comprising two pairs of transversely spaced rollers mounted side by side along the tracks, the latter two pairs being spaced apart by a distance which is less than the spacing of the locations, and one of the pair of rollers of said latter two pairs being resiliently mounted.
2. A roller track according to Claim 1 wherein said latter two roller pairs are both mounted resiliently on lever arms between a fixed roller pair on either side thereof.
3. A roller track according to Claim 2 wherein adjustable spring elements are provided on said lever arms.
4. A roller track according to Claim 1, the means for resiliently supporting the rollers are hydraulic means.
5. A roller track according to Claim 1 wherein the rollers of the location upstream of said location comprising two pairs of rollers are fixedly mounted.
6. A roller track according to Claim 1, wherein the rollers of the location downstream of said location comprising two pairs of rollers are fixedly mounted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE7504668 | 1975-02-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1044169A true CA1044169A (en) | 1978-12-12 |
Family
ID=6650264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA244,781A Expired CA1044169A (en) | 1975-02-07 | 1976-02-02 | Roller conveyor |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA1044169A (en) |
| FR (1) | FR2300307A1 (en) |
| GB (1) | GB1545853A (en) |
-
1976
- 1976-01-28 GB GB321376A patent/GB1545853A/en not_active Expired
- 1976-02-02 CA CA244,781A patent/CA1044169A/en not_active Expired
- 1976-02-06 FR FR7603300A patent/FR2300307A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2300307A1 (en) | 1976-09-03 |
| FR2300307B3 (en) | 1979-10-12 |
| GB1545853A (en) | 1979-05-16 |
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