Title: Device for sintering a shaped body
Abstract: The invention concerns a device (1) for sintering of a porous mold body (2) in a gas-tight chamber (3), with the mold body (2) hanging loose from a link chain (7) so that it can be fed continuously to a heating zone (5). In the area of the upper boiler (10), the traction direction of the link chain (7) is reversed by a deviation wheel (11). The tensile force is transmitted via a traction rope (13) that can be taken up on a take-up reel (14), such take-up reel (14) being driven by a drive (16) arranged outside the chamber (3). A drive shaft (15) for the take-up reel (14) provides for easy sealing of the duct (18) towards the chamber (3), because only a rotation and not a simultaneous axial displacement is required for the hoisting movement, and moreover, because the duct (18) is arranged at a spatial distance from the heating zone (5). The link chain (7) consists of carbon fiber reinforced mineral carbon materials and is thus resistant to high temperatures, so that no contamination of the mold body (2) by released components of the material of the link chain (7) will occur.
Patent Number: 6,923,025 Issued on 08/02/2005 to Christiansen
| Inventors:
|
Christiansen; Uwe (Gelnhausen, DE)
|
| Assignee:
|
Heraeus Tenevo AG (Hanau, DE)
|
| Appl. No.:
|
019102 |
| Filed:
|
April 11, 2001 |
| PCT Filed:
|
April 11, 2001
|
| PCT NO:
|
PCT/EP01/04139
|
| 371 Date:
|
December 20, 2001
|
| 102(e) Date:
|
December 20, 2001
|
| PCT PUB.NO.:
|
WO01/81257 |
| PCT PUB. Date:
|
November 1, 2001 |
Foreign Application Priority Data
| Apr 22, 2000[DE] | 100 20 033 |
| Current U.S. Class: |
65/484; 65/529; 65/540 |
| Intern'l Class: |
C03B 037/01.8 |
| Field of Search: |
65/377,381,427,484,529,540,486
|
References Cited [Referenced By]
U.S. Patent Documents
| 3121630 | Feb., 1964 | Bussard.
| |
| 4552576 | Nov., 1985 | Hara et al.
| |
| 5032079 | Jul., 1991 | Tsuchiya et al.
| |
| 5259856 | Nov., 1993 | Ohga et al.
| |
| 5423898 | Jun., 1995 | Terashima et al.
| |
| 6555048 | Apr., 2003 | Yoon et al.
| |
| Foreign Patent Documents |
| 37 11 281 | Jun., 1988 | DE.
| |
| 0 416 614 | Mar., 1991 | EP.
| |
| 0 529 694 | Mar., 1993 | EP.
| |
| 0 547 560 | Jun., 1993 | EP.
| |
| WO 93/2334/1 | Nov., 1993 | WO.
| |
Other References
Patent abstracts of Japan, vol. 17, No. 73 Feb. 15, 1993 for JP 04 275935A.
Patent Abstracts of Japan, vol. 17, No, 73 Feb. 15, 1993 for JP 04 275936A.
Patent Abstracts of Japan, vol. 11, No. 141 May 8, 1987 for JP 61 281038.
Patent Abstracts of Japan, vol. 18, No. 456 Aug. 25, 1994 for JP 06 144841A.
Patent Abstracts of Japan, vol. 16, No. 13 Jan. 14, 1992 for JP 03 232733.
|
Primary Examiner: Hoffmann; John
Attorney, Agent or Firm: Tiajoloff & Kelly
Claims
1. A device for sintering of a silicon dioxide soot body, said device comprising:
a gas-tight chamber having an inner space therein and a duct communicating therewith
and a heating zone in the inner space; and
a device for vertical feeding of the mold body into the heating zone, said vertical
feeding device having a hoisting apparatus extending into the inner space of the
chamber through the duct, said hoisting apparatus being movable by means of a drive
arranged outside of the chamber;
the hoisting apparatus having a drive shaft extending through the duct into the
inner space of the chamber, said drive shaft being connected to the drive; and
wherein the hoisting apparatus has a link chain having individual links.
2. A device according to claim 1, wherein the link chain deviates from a direction
of vertical traction by contact with a deviation structure.
3. A device according to claim 2, wherein the links of the link chain are connected
to each other so as to prevent relative rotation thereof around a longitudinal
axis of the link chain.
4. A device according to claim 2, wherein each link of the link chain includes
a fixed link or eyelet, said fixed links or eyelets being movably connected by
a pin.
5. A device according to claim 4, wherein the link chain has individual rollers,
each roller on deviation being supported on the deviation structure.
6. A device according to claim 5, wherein the rollers each have a diameter and
the fixed links or eyelets have external heights that are smaller than the diameter
of the rollers.
7. A device according to claim 5, wherein the deviation structure has a recess
therein which receives therein the fixed links or eyelets spaced from the deviation
structure so as not to engage therewith.
8. A device according to claim 2, wherein the deviation structure comprises a
deviation wheel.
9. A device according to claim 8, wherein the deviation wheel has a chain wheel
positively engaging into the link chain.
10. A device according to claim 9, wherein the deviation wheel is driven by means
of the drive shaft.
11. A device according to claim 1, wherein the links of the link chain are connected
to each other so as to prevent relative rotation thereof around a longitudinal
axis of the link chain.
12. A device according to claim 1, wherein each link of the link chain includes
a fixed link or eyelet, said fixed links or eyelets being movably connected by
a pin.
13. A device according to claim 1, wherein the link chain is connected through
a traction rope to a take-up reel driven by means of the drive shaft.
14. A device according to claim 1, wherein the links of the links chain are of
a tensile and temperature-resistant material.
15. A device according to claim 1, wherein the links are of a mineral carbon
material reinforced by carbon fiber.
16. A device according to claim 1, wherein a force-sensing device determines
a force acting upon the hoisting apparatus.
17. A device according to claim 16, wherein the link chain deviates from a direction
of vertical traction by contact with a deviation structure, and the force-sensing
device has a strain control strip to determine the force acting upon the deviation structure.
18. A device according to claim 1, wherein the device includes a guiding appliance
for the link chain which prevents deviation diagonally to a traction direction
of the link chain.
19. A device according to claim 1, wherein the device includes a catch limiting
vertical movement of the link chain.
Description
FIELD OF THE INVENTION
This invention concerns a device for sintering of a mold body, especially of
silicon dioxide soot, in a gas-tight chamber, the device for vertical feeding of
the mold body into a heating zone being equipped with a hoisting appliance extending
into an inner space of the chamber through a duct, such hoisting appliance being
mobile by means of a drive arranged outside of the chamber
BACKGROUND OF THE INVENTION
In the manufacture of pre-molds for optical fibers or for semiconductor engineering,
intermediate products are frequently used, the silicon dioxide mold body being
present as a so-called soot body. For sintering, the mold body is fed into the
heating zone of a zone melting furnace in which the mold body is heated to its
softening temperature; thus, the transition is initiated. Because of the high quality
demands, above all with applications in communication and semiconductor engineering,
sintering is done in a gas-tight chamber to reliably avoid any contaminations.
Usually, axially traveling columns are used as hoisting appliances to which
the mold body is fixed upright or hanging. Such a hanging arrangement is known
for example from EP-A 0,416,614, EP-A 0,529,694, and EP-A 0,547,560, in which the
porous mold body is fixed hanging to a vertically or rotatingly mobile column and
can thus be fed to the heating zone within the chamber which is filled with a low-reaction
gas. Similarly, in U.S. Pat. No. 5,032,079 the porous mold body is fixed hanging
to a vertically or rotatingly mobile column within the chamber which is filled
with an inert gas, for example, nitrogen or helium.
Comparably, WO 93/23,341 A1 provides for a device for sintering with
a chamber operable at ambient pressure or in a vacuum in which the mold body is
arranged hanging at a vertically mobile column rotatable around its axis.
To seal the column off from the interior of the chamber, a state-of-the-art seal
is provided at the duct which guarantees reliable sealing while being insensitive
to the high temperatures occurring during the sintering process. With the described
state of the-art, it is a disadvantage that in practice the seal is frequently
subject to considerable wear, causing quick deterioration of the sealing effect,
always resulting in reduced quality of the mold body after sintering.
Here, it is especially problematic that small quantities of Cl
2
are released during sintering which after opening the chamber to remove the mold
body react on the ambient humidity to form HCl, which is aggressive to the surface
of the column. When the column is moved, this increased roughness of the surface
damages the seal. Accordingly, the components of the hoisting appliance require
much maintenance and care and must be treated or replaced regularly, resulting
in reduced availability of the appliance. If a damage to the seal is not recognized
promptly, the sealing oil present in the seal can penetrate into the inside of
the chamber where it will evaporate under the high temperatures, causing contaminations
in the chamber which will be detectable in the final product.
Furthermore, deposits, consisting above all of SiO
2, occur
on the surface of the section of the column extending into the interior of the
chamber, which have to be removed regularly to avoid any damages and thus leakages
of the duct.
The above mentioned problems occur more frequently with a hanging arrangement
in which the duct is above the mold body and in which under the influence of gravity,
the sealing oil can easily penetrate into the inside of the chamber; such problems
cannot be avoided even with a standing arrangement of the hoisting column, as because
of the relative axial movement between the hoisting column and the duct, inadmissible
quantities of sealing oil penetrate into the inside of the chamber even through
minor damages to the seal and will subsequently be detectable in the mold body.
SUMMARY OF THE INVENTION
With this background, the present invention is based on the task to provide
for a device of the above described type with a hoisting device in the interior
of the chamber operated by a drive arranged outside of the chamber in such a way
that the availability of the device and the quality of the mold body manufactured
in the sintering process are improved, and that above all contaminations caused
by leakages at the duct are to be excluded as far as possible. At the same time,
the amount of maintenance required is to be reduced.
This task is met by a device according to the characteristics of Claim 1.
The Sub-Claims concern especially useful further developments of the invention.
That is to say that a device is provided in which the hoisting appliance has
a drive shaft extending through the duct into the inner space of the chamber which
is connected to the drive. By means of this exclusively rotating drive shaft, any
damage to the duct can be essentially excluded. The section of the drive shaft
extending into the inner space of the chamber does not reach the area of the duct,
so that any changes of the surface condition of the drive shaft, for example, by
deposits on the drive shaft, cannot come into contact with the seal and thus cannot
negatively influence the operativeness of the seal. The availability of the seal
is above all improved by the reduction of the required maintenance work. Besides,
a section of the drive shaft contaminated with seal oil cannot reach the inner
space of the chamber so that the mold body cannot be contaminated by evaporating
seal oil during sintering. Accordingly, use of the known seals with a filling of
seal oil can be continued, which keeps the amount of work required for the manufacture
of the device comparatively low and makes it possible to retrofit existing plants,
their column being used as drive shaft. In this, the drive shaft, for this purpose
equipped with a thread section, a pinion or a cam, cooperates with a construction
element of the hoisting appliance in the inner space of the chamber.
Here, an embodiment of the device according to the invention is especially
advantageous in which the hoisting appliance has a line chain consisting of individual
links in the area of the heating zone. The links of the link chain can also have
an eyelet form and thus form an eyelet chain. The link or eyelet chain allows for
flexible fixation of the mold body in various positions, as well as for unproblematic
adjustment to various geometric dimensions of the mold body. With mold bodies of
higher weight, links can furthermore be replaced or added to achieve increased
carrying capacity without any work or time-intensive design changes. The mold body
is fixed in a hanging position at the link or eyelet chain, the mold body being
fed to the heating zone for example by linear (take-up) movement of the link chain.
The design of a further development of the device is especially useful by providing
for the link chain being reversable from the vertical traction direction at the
deviation space. In this way, the arrangement of the drive shaft and the duct into
the inner space can take place with the relevant seal in spatial distance from
the heating zone, so that the temperature in the duct area can be significantly
reduced compared to the sintering temperature. Thus, the fault liability of the
seal can be significantly reduced. The deviation space can for example be equipped
with a gliding space so that apart from the link chain, no other movable elements
are required.
In an especially useful embodiment of the invention, the links of the link chain
are connected to each other in such a way that any rotation around the axis of
the main extension of the link chain is essentially excluded. In this way, any
unintentional and uncontrolled rotation of the mold body hanging from the link
chain is prevented. Thus, undesirable uneven heating of the mold body in the heating
zone, and the resulting reduction of quality, above all in rotation-unsymmetrical
mold bodies, is avoided.
In another especially useful embodiment of the device according to the invention,
the links of the link chain each have a fixed link or oval eyelets, such fixed
links or oval eyelets being slewably connected by an axis. Thus, a high mechanic
load carrying capacity of the individual links is achieved, while at the same time,
rotation around the pull axis is excluded. The dimensions of the fixed links or
oval eyelets are determined by the drive type and, if applicable, by the deviation
of the link chain.
An embodiment of the invention has proved to be of advantage in which the link
chain has individual rollers, each roller during deviation resting on the deviation
space. On deviation, the rollers are rolled off on the deviation space, thus reducing
the resistance of the link or eyelet chain on reversal of direction. Simultaneously,
there are less detrimental influences by wear or abrasion, and the required driving
power is reduced. Besides, any lateral powers affecting the links of the link chain
can be excluded, so that the design of the links of the link chain is essentially
determined by the tensile load to be expected. For this purpose, the links of the
link chain can be equipped with two parallel outside fixed links or oval eyelets
enclosing the rollers, or they can have the rollers also at their outside.
To this effect, it is especially favorable, if the height h of the fixed links
or oval eyelets in their outside dimensions is set back from the roller diameter.
In this way, any contact between the deviation space and the fixed link can be
effectively prevented, the necessary difference between the dimensions of the fixed
link or oval eyelet and the roller being determined above all by the radius of
the deviation space and the distance of the rollers arranged in sequence.
In another especially favorable embodiment of the invention, the deviation space
has a recess intended for the fixed links or oval eyelets. By means of these recesses,
sufficient free space is created into which the fixed links or oval eyelets can
engage, thus avoiding any contact between the deviation space and the fixed link.
Consequently, the dimensions of the link or eyelet chain can be determined independent
of the deviation, so that a potential subsequent alteration of the guiding appliance
for the link chain is unproblematic. Furthermore, the recess by engagement of the
fixed links prevents any lateral slipping off as well as any deviation from a given
course of the link chain.
Here, it is especially recommendable to arrange the deviation space at a deviation
wheel so that the frictional resistance is reduced further, and that very small
deviation radii can be achieved. Such deviation wheel can be designed similar to
a V-belt pulley with lateral conical sides or boards, or with convexities arranged
at its circumference and adapted to the form of the links.
In another, likewise very recommendable embodiment of the device according to
the invention, the deviation wheel has a chain wheel positively engaging into the
rollers of the link chain. This not only prevents lateral slipping but also a potential
slip of the link chain at the circumference of the deviation wheel. By grasping
the changed rotation angle of the chain wheel, also the vertical position of the
link chain and accordingly of the mold body can be identified. Furthermore, this
prevents a transmission of lateral powers to the parallel fixed links of the chain
link connected by rollers and running along both sides of the chin wheel.
Here, a simple design is realized if the deviation wheel can be driven by means
of the drive shaft. For this purpose, the deviation wheel can be fastened directly
at the drive shaft, thus allowing for unproblematic vertical movement of the mold
body. The end of the link chain opposite the mold body can hang loose, or it can
rest to a guiding appliance. Moreover, to prevent any total slip of the link chain,
an end link with a different shape than that of the other links can be provided.
In another, especially reliable embodiment of the invention, the link chain by
means of a traction rope is connected to a take-up reel driven by the drive shaft,
the traction rope being dimensioned in such a way that it cannot get into the freely
hanging section above the mold body. Accordingly, the traction rope is situated
outside of the sphere of influence of the heat radiation of the heating zone; besides,
any uncontrolled rotation of the mold body is prevented.
Here, an embodiment is especially recommendable in which the links of the link
chain are manufactured from a tensile and temperature-resistant material. Any exhalation
of material components of the link chain which might result in disadvantageous
changes to the mold body is kept to a minimum.
The link chain could consist essentially of ceramic material components. In an
especially favorable embodiment, however, the links are manufactured from a carbon
fiber reinforced mineral carbon (a so-called CFC material). This material combines
high solidity and temperature resistance with an essential level of chemical inertance
to silicon dioxide soot and quartz glass. Due to the high tensile strength of carbon
fiber reinforced mineral carbon, the cross section of the links can be small. The
low weight of this link chain requires comparatively little driving power.
In another especially useful embodiment of the device, a force-sensing device
is provided for determination of a force acting upon the hoisting appliance. Thus,
any load on the link chain exceeding the permissible limit can be detected which
can occur for example when the mold body gets jammed inside the chamber, so that
the drive can be disconnected before any damage to the device and/or the mold body
occurs. Furthermore, this embodiment provides for recognition of the point when
an upper end position of the link chain is reached.
To this effect, the force-sensing device can be arranged at the drive or the
drive
shaft. Another embodiment has proven to be especially effective, however, in which
the force-sensing device is equipped with a wire strain gauge to determine the
force acting upon the deviation space. For this purpose, the wire strain gauge
is arranged especially in the area of a holder element of the deviation wheel equipped
with the deviation space which is for example subject to bending under load. Here,
the wire strain gauge is only exposed to moderate temperatures and thus allows
for reliable determination of the forces arising.
In another advantageous embodiment, the device is equipped with a guiding appliance
for the link chain which precludes any slipping diagonally to the traction direction
of the link chain. This prevents any oscillation of the link chain due to the fact
that only the rollers of the link chain rest on the deviation surface and that
accordingly a horizontal shifting can occur between the support points of the rollers.
In this way, the distance between the mold body hanging from the link chain and
the heating zone is kept constant, so that any uneven heating is precluded.
Furthermore, it is of advantage when the device has a catch to limit
the vertical hoisting movement. In this way, any damage of the mold body by contact
with the chamber or with components of the hoisting appliance is reliably excluded.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention allows for numerous embodiments. To explain its basic principle
in more detail, two embodiments are illustrated in the Figures and described in
the following.
It is shown in
FIG. 1 a lateral sectional view of a device for sintering of a mold body, such
mold body hanging from a link chain;
FIG. 2 an enlarged perspective view of a section of the link chain represented
in FIG. 1;
FIG. 3 an enlarged representation of the link chain shown in FIG. 1, in a sectional
view diagonally to the traction direction;
FIG. 4 an enlarged sectional view of a deviation wheel of the device shown in
FIG. 1;
FIG. 5 a perspective view of a link chain in an embodiment different from the
type shown in FIG. 2;
FIG. 6 a sectional view of the link chain shown in FIG. 5.
DETAILED DESCRIPTION
FIG. 1 shows in lateral sectional view a device
1 according to the invention
for sintering of a porous mold body
2. As an elementary component, device
1 contains a gas-tight chamber
3, in the inner space
4 of
which chamber
3 the mold body
2 can be continually fed vertically
to a heating zone
5. This is effected by means of a hoisting appliance
6
with a link chain
7, the bottom end
8 of the latter having a rest
9 for the mold body
2. In the area of the upper boiler
10
of the chamber
3, the direction of the link chain
7 is reversed by
means of a deviation wheel
11, the free end
12 of the link chain
7 opposite the mold body
2 being equipped with a traction rope
13.
This traction rope
13 can easily be taken up on a winding appliance in the
form of a take-up reel
14, thus allowing for the desired lifting movement
of the mold body
2. The take-up reel
14 is flanged to a drive shaft
15 which is directly connected to a drive
116 arranged outside of
the chamber
3. To seal the drive shaft
15 off from the inner space
4 of the chamber
3, a duct
18 with a seal
17 is provided.
Contrary to the commonly used state-of-the-art axially traveling column, the exclusively
rotating drive shaft
15 allows for the inner space
4 of the chamber
3 to be sealed off from the environment without any problems. Accordingly,
any deposits on the surface of the section
19 of the drive shaft
15
extending into the inner space
4 do not cause leakages as section
19
cannot get into the seal
17. Furthermore, the spatial separation of the
heating zone
5, that can be controlled by means of an optical temperature-sensing
device
20, on the one hand, and the take-up reel
14 on the other
hand, provide for a comparatively simple reduction of the occurring temperatures,
resulting in higher process reliability.
Furthermore, the device
1 is equipped with a force-sensing device
21, which records any overload of the link chain
7, so that any damage
to the device
1 or the mold body
2 can be avoided. For this purpose,
the deviation wheel
11 by means of a bedding
22 is fastened to a
support
23 designed as a bending bar, such support
23 being equipped
with a strain control strip
24. In this way, the device registers, for example,
any reaching of a maximum lifting height, in which the rest
9 of the mold
body
2 hits a catch
25, and the drive
16 is disconnected in
due time. At the same time, the catch
25 is equipped with a guiding appliance
26 for the link chain
7 which prevents any deviation of the otherwise
freely hanging link chain
7 diagonally to the vertical traction direction,
so that the desired lateral position of mold body
2, above all in the area
of the heating zone
5, is maintained. To reduce the frictional resistance
of the link chain
7 in the lifting process, the individual chain links
27
are equipped with rollers
28 which can roll on a deviation space
29
of the deviation wheel
11. Here, the diameter of the rollers
28 in
relation to the height of the fixed links
30 of the links
27 projects
in such a way that any contact between the fixed links
30 and the deviation
space
29 of deviation wheel
11 is precluded, and that accordingly
any damaging lateral powers acting upon the fixed links
30 are avoided.
In the operative position as represented, the mold body
2 already hangs
freely from the rest
9 of the link chain
7 on the level of a lower
boiler
31. Prior to starting the sintering process, the upper boiler
10
must first be lifted by means of a hydraulic hoisting equipment
32 (arrow
I) and to swivel it to the side (arrow II) to place the mold body
2 by means
of another, not represented hoisting appliance into a centering ring
33
of the floor flange
34 Then, the upper boiler
10 is swiveled over
the mold body
2 (but not lowered), and the link chain
7 is let down
in such a way that the mold body
2 can be manually connected to the rest
9. After that, the mold body
2 is lifted so far that it will not
sit again on the centering ring
33 even during the subsequent lowering of
the upper boiler
10 onto the lower boiler
31. By means of a vacuum
pump (not represented), the inner space
4 of the chamber
3 is then
evacuated so that the sintering process can be started.
The design structure of the link chain
7 is explained in detail by means
of a perspective view in FIG.
2. It shows a section of the link chain
7
with the rollers
28 arranged in pairs on a common axis
35, such rollers
28 including several parallel fixed links
30 in misaligned (interlocked)
arrangement. Because of the high temperatures required in the sintering process,
the modules of the link chain
7 are manufactured from a tensile and temperature-resistant
material, especially favorably from carbon fiber reinforced mineral carbons. To
counteract any damage to the fixed links
30 by inadmissible lateral forces,
the diameter D of the rollers
28 in relation to the height h of the fixed
links
30 is determined in such a way that any contact of the fixed links
30 and the deviation space
29 of the deviation wheel shown in FIG.
1 is precluded.
This difference d between the diameter D of the rollers
28 and the height
h of the fixed links
30 is also made evident in FIG.
3. The geometry
of the rollers
28, projecting in relation to the fixed links
30,
is visible, each of such rollers
28 being fastened on the common axis
35
by means of a pin
36. At their ends, the fixed links
30 have an opening
37, through which the axis
35 is led allowing for rotation movement.
Other than in the illustrated embodiment, the fixed links
30 can also have
a different material thickness to balance the alternatingly different number of
fixed links
30 of one link
27, and thus the different maximum traction
strength. In the illustrated design, the individual links
27 connected to
each other by the axis
35 have only freedom enough to swivel around the
axis
35 so that any undesirable rotation or oscillation around its longitudinal
axis of the mold body
2 hanging freely as shown in FIG. 1 is essentially excluded.
FIG. 4 shows the deviation wheel
11 shown in FIG. 1 in a sectional view
along the axis level. A recess
38 arranged centrally at the circumference
and designed as a groove around all the circumference is visible which is followed
at both sides by the deviation space
29, designed as a support space, with
its boards
39. The rollers
28 of the link chain
27 rest on
the deviation spaces
29, so that a low-friction lifting movement of the
link chain
27 is realized. Here, the boards
39 prevent any lateral
slipping of the link chain
27 from the deviation wheel
11. Any contact
between the fixed links
30 and the deviation wheel and a resulting inadmissible
bending load is avoided by the recess
38.
It is also possible without any problems to provide for the diameter of the rollers
to be corresponding to the height of the fixed links, contrary to the embodiment
as illustrated, by designing the recess accordingly.
In FIG. 5, a modified design of a section of a link chain is shown which is formed
as an eyelet chain
40, which is shown in more detail referring to FIG.
6.
Here, The eyelet chain
40 comprises oval eyelets
41 which consist
of tube sections, which allow not only for simple manufacture but also for an optimum
adaptation to the required tensile strength of the eyelet chain
40. Furthermore,
the oval eyelets
41 manufactured from a carbon fiber reinforced mineral
carbon material are connected to each other so that they run easily, the rollers
28 of mineral carbon being pressed on to the axes
35 and fastened
by means of the pins
36 For the geometric dimensions of the oval eyelets
41 in relation to the rollers
28, the principles explained by example
of the FIGS. 2 to
4 apply accordingly. As can be seen especially well in
FIG. 6, the diameter D of the rollers
28 projects in relation to the oval
eyelets
41, while the height h of the oval eyelet
41 is reduced.
The staggered arrangement of the oval eyelets
41 allows for a design of
the link chain in the form of the eyelet chain
40 which in itself is dimensionally
stable, while the width of such link chain is essentially optional.
This invention is not limited to the embodiments represented in the drawing.
Thus, a single roller can be enclosed by one fixed link each at the outer side
so that a deviation wheel, designed as a chain wheel for this purpose, engages
with its teeth into the free spaces between the consecutive rollers. Thus, any
lateral sliding off and any potential slip between the deviation wheel and the
link chain are avoided.
| |
| List of reference numbers |
| |
| |
| 1 |
device |
| 2 |
mold body |
| 3 |
chamber |
| 4 |
inner space |
| 5 |
heating zone |
| 6 |
hoisting appliance |
| 7 |
link chain |
| 8 |
bottom end |
| 9 |
rest |
| 10 |
upper boiler |
| 11 |
deviation wheel |
| 12 |
free end |
| 13 |
traction rope |
| 14 |
take-up reel |
| 15 |
drive shaft |
| 16 |
drive |
| 17 |
seal |
| 18 |
duct |
| 19 |
section |
| 20 |
temperature-sensing device |
| 21 |
force-sensing device |
| 22 |
bedding |
| 23 |
support |
| 24 |
strain control strip |
| 25 |
catch |
| 26 |
guiding appliance |
| 27 |
link |
| 28 |
roller |
| 29 |
deviation space |
| 30 |
fixed link |
| 31 |
lower boiler |
| 32 |
hoisting equipment |
| 33 |
centering ring |
| 34 |
floor flange |
| 35 |
axis |
| 36 |
pin |
| 37 |
opening |
| 38 |
recess |
| 39 |
board |
| 40 |
eyelet chain |
| 41 |
oval eyelets |
| D |
diameter |
| h |
height |
| d |
difference (D-h)/2 |
| I |
hoisting direction |
| II |
swiveling direction |
| |
*
