EP1070788A2 - Containment chamber for milling drum of road scarifiers - Google Patents
Containment chamber for milling drum of road scarifiers Download PDFInfo
- Publication number
- EP1070788A2 EP1070788A2 EP00114932A EP00114932A EP1070788A2 EP 1070788 A2 EP1070788 A2 EP 1070788A2 EP 00114932 A EP00114932 A EP 00114932A EP 00114932 A EP00114932 A EP 00114932A EP 1070788 A2 EP1070788 A2 EP 1070788A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- drum
- chamber
- milling drum
- curved wall
- air gap
- 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.)
- Granted
Links
Images
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
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/08—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades
- E01C23/085—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades using power-driven tools, e.g. vibratory tools
- E01C23/088—Rotary tools, e.g. milling drums
Definitions
- the finding relates to a containment chamber of the milling drum of road scarifiers.
- road scarifiers are machines used for removing bitumen road surfaces, concrete road surfaces, or the like, which cover for example road sites.
- They substantially comprise a frame mounted on wheels provided with a propulsion unit, with a driving seat for the operator, and with a milling drum arranged in contact with the road surface to be removed.
- the milling drum presents a plurality of active elements, realised with different shapes according to the use requirements, which - during the rotation of the milling drum - crumble the road surface with which they come into contact.
- the milling drum is contained into a chamber laterally delimited by the frame body sides, and on the upper side, for at least a portion, by a curved wall with the concavity facing the active elements, and spaced from them.
- the material removed by the active elements is directed -by centrifugal force - towards the above curved wall, which conveys it onto a conveyor belt, which unloads it, for example, into the body of a lorry.
- Figure 1 shows a known embodiment of the containment chamber C of the milling drum T of a road scarifier M, wherein it can be seen that the curved wall P is realised with a profile concentric to the milling drum T by an angle ⁇ of about 90°.
- the air gap defined between the curved wall P and the periphery of drum T presents a constant and the most reduced possible radial width R along its entire development, so as to guarantee an even distribution of the milled material into the air gap itself, preventing it from accumulating above all in the front side of the drum.
- the portion of wall which is more affected by this phenomenon is the upper central portion, the farthest from the ground, identified with W in figure 1, wherein the milled material collects by virtue of the transport effect due to the centrally-convergent helicoidal arrangement of the active elements A arranged onto the milling drum T.
- a solution adopted in the attempt to reduce said disadvantage consists in realising the curved wall P with high-resistance materials, adapted to delay its wear.
- the present finding has the object of obviating said disadvantages.
- First object of the finding is that of providing a containment chamber for the milling drum of a road scarifier wherein the curved wall covering the drum should be less subject to wear than known embodiments.
- Another object is that of providing the chamber of the finding as being realised using commercial steel plates.
- Last but not least, another object is that of providing the chamber of the finding as having manufacturing costs not exceeding those of the chambers of the known type that are equivalent to it.
- a containment chamber for the milling drum of road scarifiers of the type comprising a frame mounted on wheels adapted to support said milling drum, and provided with a propulsion unit and with a driving seat for the operator, said chamber being laterally delimited by the body sides of said frame, and on the upper side, for at least a portion, by a curved wall with the concavity facing said drum and spaced from the active elements for the removal of the road surface with which said drum is provided, and it is characterised in that the air gap defined between said curved wall and said active elements presents a variable radial width for at least a portion of its development.
- the radial width of the air gap is minimum at the horizontal radial direction which substantially corresponds to the inlet point of the removed material, and it is maximum at the vertical radial direction rotated by 90° with respect to the former one, which substantially corresponds to the outlet point of the removed material.
- the curved wall presents a profile which is transversal to the axis of the drum, consisting of an arch of ellipse.
- the curved wall presents a profile which is transversal to the axis of the drum, consisting of an arch of circumference.
- the chamber of the finding allows a better conveyance of the milled material than with the prior art.
- the chamber of the finding has a greater width in the portion wherein the milled material concentrates, it presents a lower wear.
- the increase of volume of the air gap at the unload decreases the pressure of the material against the curved wall, and makes the expulsion from the chamber faster.
- the containment chamber of the finding houses the milling drum 2 of a road scanfier, referred to in its whole with M, which comprises a frame 3 mounted on wheels 4 , provided with a propulsion unit 5 and a driving seat 6 for the operator.
- the milling machine 2 is supported by frame 3 , and it presents active elements 2a that, during the rotation of the milling drum, come into contact with the surface to be removed which, for example, can be the bitumen road surface 7 which covers a road site.
- chamber 1 is delimited, on its sides, by the side walls of frame 3 of the road scarifier, and in the upper side, by a curved wall 8 with concavity 8a facing drum 2 and spaced from its active elements 2a .
- air gap 9 defined between the curved wall 8 and the active elements 2a of the milling drum 2 presents a variable radial width l for at least a portion of its development.
- the radial width l changes from the minimum value a at the horizontal radial direction determined by an axis x, to the maximum value b at the vertical radial direction determined by an axis y, where axes x and y represent a Cartesian reference system having the origin coinciding with the centre O of the milling drum 2 .
- the curved wall of the finding realised according to the described elliptical or circular profiles, attains the set purposes.
- the chamber can be of any shape and size, and the development of the curved wall delimiting the chamber can be geometrically defined also according to another curve with respect to a circle or an ellipse.
Abstract
The finding accomplishes a containment chamber (1; 10) of the milling drum
(2) of road scarifiers (M) of the type comprising a frame (3) mounted on wheels
(4) adapted to support said milling drum (2) and provided with a propulsion unit
(5) and with a driving seat (6) for the operator. The chamber (1; 10) is laterally
delimited by the body sides of said frame (3) and in the upper side, for at least
a portion, by a curved wall (8; 11) with the concavity facing said drum (2) and
spaced from the active elements (2a) for the removal of the road surface, of
which said drum (2) is provided. The air gap (9; 12) defined between said
curved wall (8; 11) and the active elements (2a) presents a variable radial
width (l) for at least a portion of its development.
Description
The finding relates to a containment chamber of the milling drum of road
scarifiers.
As known, road scarifiers are machines used for removing bitumen road
surfaces, concrete road surfaces, or the like, which cover for example road
sites.
They substantially comprise a frame mounted on wheels provided with a
propulsion unit, with a driving seat for the operator, and with a milling drum
arranged in contact with the road surface to be removed.
The milling drum presents a plurality of active elements, realised with different
shapes according to the use requirements, which - during the rotation of the
milling drum - crumble the road surface with which they come into contact.
The milling drum is contained into a chamber laterally delimited by the frame
body sides, and on the upper side, for at least a portion, by a curved wall with
the concavity facing the active elements, and spaced from them.
The material removed by the active elements is directed -by centrifugal force -
towards the above curved wall, which conveys it onto a conveyor belt, which
unloads it, for example, into the body of a lorry.
Figure 1 shows a known embodiment of the containment chamber C of the
milling drum T of a road scarifier M, wherein it can be seen that the curved wall
P is realised with a profile concentric to the milling drum T by an angle α of
about 90°.
The air gap defined between the curved wall P and the periphery of drum T
presents a constant and the most reduced possible radial width R along its
entire development, so as to guarantee an even distribution of the milled
material into the air gap itself, preventing it from accumulating above all in the
front side of the drum.
Nevertheless, it has been noted that an excessive reduction of the radial width
R causes a marked and fast wear of the curved wall due to the contact with the
milled material and due to the significant pressure that the latter exerts on it,
being it constrained into a narrow space.
In particular, the portion of wall which is more affected by this phenomenon is
the upper central portion, the farthest from the ground, identified with W in
figure 1, wherein the milled material collects by virtue of the transport effect
due to the centrally-convergent helicoidal arrangement of the active elements
A arranged onto the milling drum T.
This implies the need of frequently overhauling or entirely or partly replacing
the curved wall P.
A solution adopted in the attempt to reduce said disadvantage consists in
realising the curved wall P with high-resistance materials, adapted to delay its
wear.
However, it is evident that the use of said materials implies an increase in the
manufacturing costs, and an increase of the price of spare parts.
Nevertheless, it has been noted that the use of said materials does not solve
the problem at the root, since its reasons are not eliminated.
The present finding has the object of obviating said disadvantages.
First object of the finding is that of providing a containment chamber for the
milling drum of a road scarifier wherein the curved wall covering the drum
should be less subject to wear than known embodiments.
Another object is that of providing the chamber of the finding as being realised
using commercial steel plates.
Last but not least, another object is that of providing the chamber of the finding
as having manufacturing costs not exceeding those of the chambers of the
known type that are equivalent to it.
Said objects are attained by providing a containment chamber for the milling
drum of road scarifiers of the type comprising a frame mounted on wheels
adapted to support said milling drum, and provided with a propulsion unit and
with a driving seat for the operator, said chamber being laterally delimited by
the body sides of said frame, and on the upper side, for at least a portion, by a
curved wall with the concavity facing said drum and spaced from the active
elements for the removal of the road surface with which said drum is provided,
and it is characterised in that the air gap defined between said curved wall and
said active elements presents a variable radial width for at least a portion of its
development.
According to a preferred embodiment, the radial width of the air gap is
minimum at the horizontal radial direction which substantially corresponds to
the inlet point of the removed material, and it is maximum at the vertical radial
direction rotated by 90° with respect to the former one, which substantially
corresponds to the outlet point of the removed material.
According to an embodiment, the curved wall presents a profile which is
transversal to the axis of the drum, consisting of an arch of ellipse.
According to another embodiment, the curved wall presents a profile which is
transversal to the axis of the drum, consisting of an arch of circumference.
Advantageously, the chamber of the finding allows a better conveyance of the
milled material than with the prior art.
Still advantageously, as the chamber of the finding has a greater width in the
portion wherein the milled material concentrates, it presents a lower wear.
Advantageously, the increase of volume of the air gap at the unload,
decreases the pressure of the material against the curved wall, and makes the
expulsion from the chamber faster.
Said purposes and advantages shall be illustrated more dearly in the
description of a preferred embodiment of the finding, which is illustrated as a
non-limitative indication with reference to the attached drawings, wherein:
- Figure 1 shows the cross section of a road scanfier and of the relevant milling drum and containment chamber, according to the prior art;
- Figure 2 shows the containment chamber of the finding, applied to a road scarifier;
- Figure 3 shows an embodiment of the chamber of the finding in cross section;
- Figure 4 shows another embodiment of the chamber of the finding in cross section.
As it can be seen in fig. 2 and more in detail in fig. 3, the containment chamber
of the finding, referred to in its whole with reference numeral 1, houses the
milling drum 2 of a road scanfier, referred to in its whole with M, which
comprises a frame 3 mounted on wheels 4, provided with a propulsion unit 5
and a driving seat 6 for the operator.
Also, the milling machine 2 is supported by frame 3, and it presents active
elements 2a that, during the rotation of the milling drum, come into contact with
the surface to be removed which, for example, can be the bitumen road
surface 7 which covers a road site.
In particular in fig. 3 it can be noted that chamber 1 is delimited, on its sides, by
the side walls of frame 3 of the road scarifier, and in the upper side, by a
curved wall 8 with concavity 8a facing drum 2 and spaced from its active
elements 2a.
According to the finding, air gap 9 defined between the curved wall 8 and the
active elements 2a of the milling drum 2 presents a variable radial width l for at
least a portion of its development.
Thus, in fig. 3 it can be seen that the radial width l changes from the minimum
value a at the horizontal radial direction determined by an axis x, to the
maximum value b at the vertical radial direction determined by an axis y, where
axes x and y represent a Cartesian reference system having the origin
coinciding with the centre O of the milling drum 2.
According to the embodiment shown in fig. 3, the curved surface 8, with
reference to the drawn system of axes x, y, presents an ellipse arch profile
whose equation, having indicated with a and b the thickness of air gap 9 along
the above axes x and y, and with r the radius of the milling drum 2, results as
follows:
x2 (r+a)2 + y2 (r+b)2 = 1
By mathematically defining the ellipse using the thickness increment i =b -a of
air gap 9 during its circumferential development corresponding to angle α, the
former equation takes on the following form:
x2 (r+a)2 + y2 (r+a+i)2 = 1
An embodiment variant of the chamber of the finding, referred to in its whole
with reference numeral 10, is represented in figure 4, where it can be seen that
it differs from the previous one in that the curved wall 11 which delimits it in its
upper side presents a profile shaped as arch of circumference, having radius:
R=r+s+i
where:
- r is the radius of the circle of the milling drum 2;
- s is the value of the width of air gap 12 at the horizontal radial direction determined by axis x;
- i represents the value of the translation according to axis x of centre O' of
the circumference with radius R which defines the profile of the curved wall
11, with respect to centre O of the milling drum 2. In this case, the profile of
the curved wall 11 with respect to the same reference system of axes x, y is
expressed by the equation of the circumference which takes on the
following form:
The curved wall of the finding, realised according to the described elliptical or
circular profiles, attains the set purposes.
It is evident that the chamber can be of any shape and size, and the
development of the curved wall delimiting the chamber can be geometrically
defined also according to another curve with respect to a circle or an ellipse.
Moreover, it can have variable length according to the requirements of use.
All the mentioned variants and all other optional variants not illustrated and not
described which should be made to the chamber of the finding, inasmuch they
are based on the same claimed resolutive idea, are to be intended as being
protected by the present finding.
Claims (6)
- Containment chamber (1; 10) of the milling drum (2) of road scarifiers (M) of the type comprising a frame (3) mounted on wheels (4) adapted to support said milling drum (2) and provided with a propulsion unit (5) and with a driving seat (6) for the operator, said chamber (1; 10) being laterally delimited by the body sides of said frame (3) and in the upper side, for at least a portion, by a curved wall (8; 11) with the concavity facing said drum (2) and spaced from the active elements (2a) for the removal of the road surface, of which said drum (2) is provided, characterised in that the air gap (9; 12) defined between said curved wall (8; 11) and said active elements (2a) presents a variable radial width l for at least a portion of its development.
- Chamber (1; 10) according to claim 1) characterised in that said air gap (9; 12) presents an increasing radial width (l) starting from a minimum value (a) at the radial direction determined by the radius (r) of said milling drum (2).
- Chamber (1) according to claim 1) characterised in that said curved wall (8) presents a transverse profile shaped as arch of ellipse.
- Chamber (1) according to claim 3) characterised in that said ellipse is defined with respect to a Cartesian reference system (x, y) having the origin (O) coinciding with the centre of said milling drum (2) and it is represented by the equationa represents the radial width of said air gap (9) measured in radial direction with respect to the drum (2) according to axis x;b represents the radial width of said air gap (9) measured in radial direction with respect to the drum (2) according to axis Y;r represents the radius of said drum (2).
- Chamber (10) according to claim 1) characterised in that said curved wall (11) presents a transverse profile shaped as arch of circumference.
- Chamber (10) according to claim 5) characterised in that said arch of circumference belongs to a circumference which is defined, with respect to an x, y Cartesian reference system having the origin (O) coinciding with the centre of said milling drum (2), by the equation:r represents the radius of said milling drum (2);s represents the radial width of said air gap (12) measured in radial direction with respect to the drum (2) according to axis x;i represents the value of the translation along the axis (x) of the centre (O') of the circumference with radius (r) which defines the profile of the curved wall (11), with respect to the origin (O) of the reference system (x, y).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITVI990061 IT248863Y1 (en) | 1999-07-23 | 1999-07-23 | CONTAINMENT CHAMBER FOR MILLING DRUM OF SCARIFYING MACHINES |
| ITVI990061U | 1999-07-23 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1070788A2 true EP1070788A2 (en) | 2001-01-24 |
| EP1070788A3 EP1070788A3 (en) | 2002-08-14 |
| EP1070788B1 EP1070788B1 (en) | 2007-05-23 |
Family
ID=11426994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00114932A Expired - Lifetime EP1070788B1 (en) | 1999-07-23 | 2000-07-18 | Road scarifier with containment chamber housing the milling drum |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1070788B1 (en) |
| DE (1) | DE60034907T2 (en) |
| IT (1) | IT248863Y1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2378000A2 (en) | 2010-04-17 | 2011-10-19 | BOMAG GmbH | Rotor box for a floor milling machine and floor milling machine with such a rotor box |
| CN102493325A (en) * | 2011-12-17 | 2012-06-13 | 于健 | Road surface milling machine |
| EP2479344A1 (en) | 2011-01-21 | 2012-07-25 | BOMAG GmbH | Rotor box for a floor milling machine with guide device for milled material and floor milling machine with such a rotor box |
| US20150130257A1 (en) * | 2012-06-25 | 2015-05-14 | Wirtgen Gmbh | Road Milling Machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3802742A (en) * | 1972-06-13 | 1974-04-09 | E Zuzelo | Multiple grooving of pavement |
| EP0735193A2 (en) * | 1995-03-30 | 1996-10-02 | BITELLI S.p.A. | A perfected road scarifying machine for the removal of road surfacings |
-
1999
- 1999-07-23 IT ITVI990061 patent/IT248863Y1/en active
-
2000
- 2000-07-18 EP EP00114932A patent/EP1070788B1/en not_active Expired - Lifetime
- 2000-07-18 DE DE2000634907 patent/DE60034907T2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3802742A (en) * | 1972-06-13 | 1974-04-09 | E Zuzelo | Multiple grooving of pavement |
| EP0735193A2 (en) * | 1995-03-30 | 1996-10-02 | BITELLI S.p.A. | A perfected road scarifying machine for the removal of road surfacings |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2378000A2 (en) | 2010-04-17 | 2011-10-19 | BOMAG GmbH | Rotor box for a floor milling machine and floor milling machine with such a rotor box |
| DE102011009093A1 (en) | 2010-04-17 | 2011-10-20 | Bomag Gmbh | Rotor box for a ground machine and ground machine with such a rotor box |
| US8297877B2 (en) | 2010-04-17 | 2012-10-30 | Bomag Gmbh | Rotor box for a ground milling machine and ground milling machine having such a rotor box |
| EP2479344A1 (en) | 2011-01-21 | 2012-07-25 | BOMAG GmbH | Rotor box for a floor milling machine with guide device for milled material and floor milling machine with such a rotor box |
| DE102011009092A1 (en) | 2011-01-21 | 2012-07-26 | Bomag Gmbh | Rotor box for a ground milling machine with guide device for milled material and ground milling machine with such a rotor box |
| CN102493325A (en) * | 2011-12-17 | 2012-06-13 | 于健 | Road surface milling machine |
| CN102493325B (en) * | 2011-12-17 | 2013-10-23 | 于健 | Road surface milling machine |
| US20150130257A1 (en) * | 2012-06-25 | 2015-05-14 | Wirtgen Gmbh | Road Milling Machine |
| US9714488B2 (en) * | 2012-06-25 | 2017-07-25 | Wirtgen Gmbh | Road milling machine |
Also Published As
| Publication number | Publication date |
|---|---|
| IT248863Y1 (en) | 2003-02-20 |
| ITVI990061U1 (en) | 2001-01-23 |
| EP1070788A3 (en) | 2002-08-14 |
| DE60034907D1 (en) | 2007-07-05 |
| EP1070788B1 (en) | 2007-05-23 |
| DE60034907T2 (en) | 2008-01-17 |
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