CN115522441A - Milling drum for a road milling machine - Google Patents

Milling drum for a road milling machine Download PDF

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Publication number
CN115522441A
CN115522441A CN202211235273.5A CN202211235273A CN115522441A CN 115522441 A CN115522441 A CN 115522441A CN 202211235273 A CN202211235273 A CN 202211235273A CN 115522441 A CN115522441 A CN 115522441A
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CN
China
Prior art keywords
milling
pick
picks
drum
resistance
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Pending
Application number
CN202211235273.5A
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Chinese (zh)
Inventor
洪海侠
胡亚文
王德志
吴壮志
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Central South University
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Central South University
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Priority to CN202211235273.5A priority Critical patent/CN115522441A/en
Publication of CN115522441A publication Critical patent/CN115522441A/en
Pending legal-status Critical Current

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    • 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
    • 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
    • E01C23/03—Arrangements for curing paving; Devices for applying curing means; Devices for laying prefabricated underlay, e.g. sheets, membranes; Protecting paving under construction or while curing, e.g. use of tents

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Milling Processes (AREA)

Abstract

The invention discloses a milling drum for a pavement milling machine, which comprises a milling drum matrix and N milling picks, wherein the milling drum matrix is provided with a middle section area containing a position of a material throwing plate and two side areas adjacent to the middle section area, each milling pick comprises a high-wear-resistance pick and a high-toughness pick, the high-toughness pick is distributed in the middle section area of the milling drum matrix, and the high-wear-resistance pick is distributed in the two side areas of the milling drum matrix. The milling cutting tooth adjusting device can adjust and arrange milling cutting teeth according to different construction road conditions, is simple to operate and high in practicability, can greatly improve the comprehensive utilization rate of the milling cutting teeth, reduces the replacement frequency of the milling cutting teeth, and saves the pavement milling cost.

Description

Milling drum for a road milling machine
Technical Field
The invention relates to the technical field of pavement milling equipment, in particular to a milling drum for a pavement milling machine.
Background
With the rapid development of the expressway in China, the maintenance requirement on the high-grade asphalt pavement is higher and higher. After the new asphalt pavement is used for 10-15 years, large-area renovation is needed, namely, the old pavement is milled and removed by a milling machine and then renovated and repaired. Therefore, milling construction of asphalt pavement will become the mainstream construction method.
The main equipment for milling and planing road surface is milling and planing machine, the milling and planing drum at the bottom of the milling and planing machine is the key part for directly milling and planing road surface, and the milling and planing picks on the milling and planing drum are the core components for directly crushing road surface materials.
The existing milling drum consists of a milling drum base body and a milling cutting pick, wherein the milling cutting pick is arranged on the milling drum base body, and the following phenomena often occur in the pavement milling process, so that the milling efficiency is low, and the cost is high:
1) When the working condition is milled shallowly on the pure asphalt surface layer, the abrasion resistance and impact resistance of the milling pick are not matched with the working condition, so that the service life of the milling pick is shortened, or the milling resistance is increased, and the efficiency is reduced.
2) When the working condition of milling and planing the asphalt surface layer and the water stable layer composite pavement is adopted, the abrasion resistance and the impact resistance of the milling and planing cutting pick cannot meet the requirements, the abnormal failure of the broken teeth occurs, and the cost is increased.
3) When milling and planning a complex pavement with a stable layer in all water, the wear resistance and the impact resistance of milling and planning cutting teeth can not meet the requirements, and abnormal failures such as falling of main alloy or crushing of the main alloy due to too fast wear of a tooth body can easily occur. The cost increases.
4) When the middle section area of the milling drum is close to the material throwing plate, the milling pick body faces more abrasion and erosion in the material throwing process, so that the abnormal failure condition of the body is caused.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the milling drum which can improve the efficiency and reduce the cost.
The milling drum for the pavement milling machine comprises a milling drum matrix and N milling picks, and is characterized in that the milling drum matrix is provided with a middle section area containing a position where a material throwing plate is located and two side areas adjacent to the middle section area, the milling picks comprise high-wear-resistance picks and high-toughness picks, the high-toughness picks are distributed in the middle section area of the milling drum matrix, and the high-wear-resistance picks are distributed in the two side areas of the milling drum matrix.
When the milling drum is used for a shallow milling working condition of an asphalt surface layer, the N milling picks comprise 70% -90% multiplied by N high-abrasion-resistance picks and 30% -10% multiplied by N high-toughness milling picks;
when the milling drum is used for milling working conditions of a composite pavement of an asphalt surface layer and a water-stable layer, N milling picks comprise 30-70% multiplied by N high-wear-resistance picks and 30-70% multiplied by N high-toughness milling picks;
when the milling drum is used for milling a complete water stable layer complex pavement, the N milling picks comprise 10% -30% multiplied by N high-abrasion-resistance picks and 70% -90% multiplied by N high-toughness milling picks.
The milling pick comprises a main alloy part and a pick body, wherein the main alloy part is welded to the top of the pick body in a brazing mode, the pick body is provided with a handle, a pick seat is arranged on a milling drum base body, and the pick body is connected with the milling drum base body through the pick seat.
The wear-resistant cutting pick body (32) is provided with a groove for reducing the resistance of the milling drum during working and improving the working efficiency.
The main alloy part of the high-wear-resistance cutting pick is made of hard alloy, the cobalt content is 5.5% -6%, and the hardness is 88-89 HRA.
The main alloy part of the high-toughness cutting pick is made of hard alloy, the cobalt content is 6-6.5%, and the hardness is 87-88.5 HRA.
According to the milling drum, the milling drum matrix is divided into the middle section area and the two side areas, the middle section area contains the position of the material throwing plate, the middle section area is provided with the high-toughness milling picks, the two side areas are provided with the high-wear-resistance picks, the middle section area is provided with the material throwing plate, the milling picks at the position are subjected to strong impact in the material throwing process, and the milling picks at the two side areas are subjected to weak impact, so that the milling drum can be used for adjusting and arranging the milling picks according to different construction road conditions, is simple to operate and high in practicability, can greatly improve the comprehensive utilization rate of the milling picks, reduces the replacement frequency of the milling picks, and saves the road surface milling cost.
Other features and advantages of the present invention will become more apparent with reference to the accompanying drawings.
Drawings
Fig. 1 shows a schematic illustration of a milling drum according to the invention;
fig. 2 schematically illustrates one construction of the high wear resistant milling pick of the present invention;
fig. 3 schematically illustrates a structural view of a high toughness milling pick of the present invention;
fig. 4 schematically illustrates a structural view of a milling pick master alloy of the present invention.
Reference numerals: milling the drum base body 1, milling the middle section area 11 and milling the two side areas 12;
a material throwing plate 2;
the milling pick 3, the main alloy 31 and the pick body 32, wherein the main alloy 31 is welded on the top of the pick body 32 by means of brazing, and the shank of the pick body 32 is connected on the surface of the milling drum base body 1 through the tooth holder 4 on the surface of the milling drum.
Detailed Description
Some, but not all embodiments of the inventions are described in detail below with reference to the accompanying drawings. All other embodiments obtained by a person skilled in the art without inventive step are within the scope of protection of the present invention.
The milling drum that the inventor designed has installed two kinds of milling pick on it totally N, one kind is the high wear-resisting milling plane tooth, and another kind is the high tenacity milling plane pick, and these two kinds of milling plane picks distribute according to different duty cycle according to different accounts for the ratio, and wherein the high tenacity milling plane pick is arranged in the interlude region of milling the drum base member, forms the high tenacity milling plane pick region, and the regional high wear-resisting milling plane tooth that arranges in both sides in this region becomes the high wear-resisting milling plane tooth region. The main alloy material of the high-wear-resistance cutting pick is hard alloy, the cobalt content is 5.5% -6%, and the hardness is 88-89 HRA. The main alloy of the high-toughness cutting pick is made of hard alloy, the cobalt content is 6-6.5%, and the hardness is 87-88.5 HRA. Through high wear-resisting milling pick and the high tenacity milling pick combine together, the rational distribution, improve effectively milling pick's comprehensive rate of utilization, reduce milling pick replacement frequency, promote milling efficiency, reduce and mill the plane cost.
The milling drum provided by the invention is described in detail below with reference to the accompanying drawings.
Fig. 1 shows a schematic structural view of a milling drum of the present invention, which is shown in fig. 1, and has a length L and a diameter D, and includes a milling drum base 1 and a thrower plate 2,N, where milling picks 3 are arranged along the surface of the milling drum base 1 according to a set spiral trajectory, and N is a natural number greater than 10;
in particular, the milling drum base body 1 comprises a milling central section area 11, two side areas 12, wherein the central section area 11 contains a thrower plate 2, the thrower plate 2 being primarily intended for the smooth throwing of milled material onto a conveyor belt of the milling machine. Therefore, the milling picks near the thrower plate 2 are inevitably strongly impacted by the material, and the high-toughness milling picks are arranged in the middle section area 11 to bear relatively large impact force in the working process; the two side regions 12 are substantially free from the impact of the material of the throwing plate 2, and the use of high wear resistance milling picks in the two side regions is sufficient for their working requirements. In practical application, the lengths of the middle section area and the two side areas of the milling drum are not fixed and are specifically divided according to specific working conditions.
The milling pick 3 comprises a main alloy 31 and a pick body 32, the main alloy 31 is soldered to the top of the pick body 32, and the shank of the pick body 32 is connected to the surface of the milling drum base body 1 through a tooth holder 4 on the surface of the milling drum, as shown in fig. 1.
Fig. 2 shows one configuration of a milling pick. The tooth body 32 is provided with a groove 321, so that the scouring resistance of the road surface crushing materials to the tooth body in the milling process is reduced, and the milling efficiency is improved. The milling pick structure is suitable for high-wear-resistance milling picks and is mainly used for milling asphalt layers with relatively simple working conditions.
Fig. 3 shows another construction of a milling pick. The tooth body 32 is not provided with a groove, the strength of the head of the tooth body is increased, and the working condition that the tooth body is eroded by a large amount of road surface crushing materials and the abrasion of the tooth body is large is mainly aimed at in the relatively complex milling. The milling pick structure is used for a high-toughness milling pick.
Fig. 4 shows the structure of the master alloy 31 at the tip of the milling pick 3, the maximum height of the master alloy being 16mm-20.5mm, the maximum diameter being 16mm-20.5mm, the material being cemented carbide with a cobalt content of 5.5% -6.5% and a hardness of 87-89 HRA. The size and the material of the main alloy are adjusted in a targeted manner according to different milling working conditions.
Example 1
The length L of the milling drum is 1000mm, the diameter D of the milling drum is 660mm, 84 milling picks are arranged on the milling drum (namely N = 84) and are applied to shallow milling of a large-area asphalt surface layer, and the 84 milling picks comprise 75 high-wear-resistance milling picks and 9 high-toughness picks. The height of the master alloy of the high-wear-resistance milling cutting pick is 16.0mm, the maximum diameter is 16mm, the material of the master alloy is 6 percent of cobalt content and 88.5HRA in hardness, the height of the master alloy of the high-wear-resistance milling cutting pick is 16.0mm, the maximum diameter is 17.5mm, the material of the master alloy is 6 percent of cobalt content and 88HRA in hardness.
Example 2
The length L of the milling drum is 1000mm, the diameter D of the milling drum is 980mm, 102 milling picks are arranged on the milling drum (namely N = 102) and are applied to shallow milling of a large-area pure asphalt surface layer, and 102 milling picks 2 comprise 82 high-wear-resistance milling picks and 20 high-toughness picks. The high-wear-resistance milling cutting pick is characterized in that the height of a main alloy is 16.0mm, the maximum diameter is 17.5mm, the main alloy is made of 6% of cobalt content and 88.5HRA in hardness, the height of the high-wear-resistance milling cutting pick is 17.5mm, the maximum diameter is 17.5mm, the main alloy is made of 6% of cobalt content and 88HRA in hardness.
Example 3
The length L of the milling drum is 1200mm, the diameter D of the milling drum is 720mm, 114 milling picks are arranged on the milling drum (namely N = 114) and are applied to shallow milling of a large-area pure asphalt surface layer, and 114 milling picks 2 comprise 80 high-wear-resistance milling picks and 34 high-toughness picks. The high-wear-resistance milling cutting pick is characterized in that the height of a main alloy is 16.0mm, the maximum diameter is 17.5mm, the main alloy is made of 6% of cobalt content and 88.5HRA in hardness, the height of the high-wear-resistance milling cutting pick is 17.5mm, the maximum diameter is 17.5mm, the main alloy is made of 6% of cobalt content and 88HRA in hardness.
Example 4
Milling drum length L is 1200mm, and diameter D is 720mm, and the installation milling pick 114 on milling drum (be N = 114), be applied to large tracts of land, long distance asphalt surface course and the compound road surface of water stable layer are milled, 114 milling pick 2 include 76 high wear resistance milling picks and 38 high tenacity picks. The high-wear-resistance milling cutting pick is characterized in that the height of a main alloy is 16.0mm, the maximum diameter is 17.5mm, the main alloy is made of 6% of cobalt content and 88.5HRA in hardness, the height of the high-wear-resistance milling cutting pick is 17.5mm, the maximum diameter is 17.5mm, the main alloy is made of 6% of cobalt content and 88HRA in hardness.
Example 5
Milling drum length L is 2000mm, and diameter D is 980mm, and the installation mills milling pick 168 on milling drum (be N = 168), is applied to large tracts of land, and long distance asphalt surface course and stable layer composite pavement are milled, 168 mills milling pick 2 and include 92 high wear resistance mills milling pick and 76 high tenacity picks. The high-wear-resistance milling cutting pick is characterized in that the height of a main alloy is 17.5mm, the maximum diameter is 19.0mm, the main alloy is 6% of cobalt content and 88.5HRA in hardness, the height of the high-wear-resistance milling cutting pick main alloy is 19.0mm, the maximum diameter is 19.5mm, the main alloy is 6% of cobalt content and 88HRA in hardness.
Example 6
The length L of the milling drum is 2000mm, the diameter D of the milling drum is 980mm, 168 milling picks are arranged on the milling drum (namely N = 168) and applied to large-area milling of a long-distance asphalt surface layer and water stable layer composite pavement, and 168 milling picks 2 comprise 52 high-wear-resistance milling picks and 116 high-toughness picks. The high-wear-resistance milling cutting pick is characterized in that the height of a master alloy is 17.5mm, the maximum diameter is 19.0mm, the master alloy is 6% of cobalt content and 88HRA in hardness, the height of the high-wear-resistance milling cutting pick is 19.0mm, the maximum diameter is 19.5mm, the master alloy is 6.5% of cobalt content and 87.5HRA in hardness.
Example 7
The length L of the milling drum is 2000mm, the diameter D of the milling drum is 980mm, 168 milling picks (namely N = 168) are arranged on the milling drum, and when a long-distance all-water stable-layer complex road surface is used for milling, the 168 milling picks 2 comprise 42 high-wear-resistance milling picks and 126 high-toughness picks. The high-wear-resistance milling cutting pick is characterized in that the height of a master alloy is 19.0mm, the maximum diameter is 19.5mm, the master alloy is made of materials with 6 percent of cobalt content and 88HRA hardness, the height of the high-wear-resistance milling cutting pick is 21.0mm, the maximum diameter is 20.5mm, the master alloy is made of materials with 6.5 percent of cobalt content and 87.5HRA hardness.
Example 8
The length L of the milling drum is 2200mm, the diameter D of the milling drum is 1070mm, 184 milling picks (namely N = 184) are arranged on the milling drum, and when the long-distance all-water-stable-layer complex pavement is used for milling, the 184 milling picks 2 comprise 38 high-wear-resistance milling picks and 146 high-toughness picks. The high-wear-resistance milling cutting pick is characterized in that the height of the master alloy is 20.5mm, the maximum diameter of the master alloy is 20.5mm, the master alloy is made of a material with the cobalt content of 6% and the hardness of 88HRA, the height of the master alloy is 21.0mm, the maximum diameter of the master alloy is 22mm, the cobalt content of the master alloy is 6.5%, and the hardness of the master alloy is 87HRA.
Example 9
The length L of the milling drum is 2200mm, the diameter D of the milling drum is 1070mm, 184 milling picks (namely N = 184) are arranged on the milling drum, and when the long-distance all-water-stable-layer complex pavement is used for milling, the 184 milling picks 2 comprise 20 high-wear-resistance milling picks and 164 high-toughness picks. The high-wear-resistance milling cutting pick is characterized in that the height of a main alloy is 20.5mm, the maximum diameter is 20.5mm, the main alloy is made of a material with the cobalt content of 6% and the hardness of 87.5HRA, the height of the main alloy is 21.0mm, the maximum diameter is 22mm, the main alloy is made of a material with the cobalt content of 6.5% and the hardness of 87HRA.
The results obtained by the above examples are: compared with the traditional milling drum with a single type of milling pick, the milling drum can reduce the replacement rate of the milling pick by 30-50% under the condition of the same working condition and the same milling amount, thereby reducing the cost and improving the milling efficiency. Particularly under the milling working condition of a long-distance all-water stable-layer complex pavement, the milling depth is more than 50cm, and when the milling distance is 2000m, 40-50 milling picks are required to be replaced by the traditional milling drum, but by adopting the technical scheme of the invention, only 20-25 milling picks are required to be replaced, so that the cost is greatly saved, the replacement time of the milling picks is reduced, and the construction efficiency is improved.

Claims (6)

1. The utility model provides a mill and dig drum for road surface milling machine, includes and mills and dig drum base member and N and mill and dig the pick, its characterized in that it has the middle section region that contains the position of throwing board and regional adjacent both sides with this interlude, it includes high wear resistance pick and high tenacity pick to mill and dig the regional distribution of interlude of drum base member high tenacity pick is milling and digging the regional distribution of both sides of drum base member high wear resistance pick.
2. Milling drum for road milling machines according to claim 1,
when the milling drum is used for a shallow milling working condition of an asphalt surface layer, the N milling picks comprise 70% -90% multiplied by N high-abrasion-resistance picks and 30% -10% multiplied by N high-toughness milling picks;
when the milling drum is used for milling working conditions of a composite pavement of an asphalt surface layer and a water-stable layer, N milling picks comprise 30-70% multiplied by N high-wear-resistance picks and 30-70% multiplied by N high-toughness milling picks;
when the milling drum is used for milling a complete water stable layer complex pavement, the N milling picks comprise 10% -30% multiplied by N high-abrasion-resistance picks and 70% -90% multiplied by N high-toughness milling picks.
3. The milling drum of claim 1, wherein the milling pick includes a main alloy portion brazed to a top of the pick body, and a pick body having a shank and a block on the milling drum base, the block being connected to the milling drum base by the block.
4. The milling drum of claim 3, wherein the wear resistant pick body includes a recess to reduce drag and improve efficiency of the milling drum during operation.
5. The milling drum of claim 3, wherein the main alloy portion of the high wear pick is cemented carbide, cobalt content is 5.5-6%, and hardness is 88-89 HRA.
6. The milling drum of claim 3, wherein the main alloy part of the high-toughness cutting pick is made of hard alloy, the cobalt content is 6-6.5%, and the hardness is 87-88.5 HRA.
CN202211235273.5A 2022-10-10 2022-10-10 Milling drum for a road milling machine Pending CN115522441A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211235273.5A CN115522441A (en) 2022-10-10 2022-10-10 Milling drum for a road milling machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211235273.5A CN115522441A (en) 2022-10-10 2022-10-10 Milling drum for a road milling machine

Publications (1)

Publication Number Publication Date
CN115522441A true CN115522441A (en) 2022-12-27

Family

ID=84702554

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211235273.5A Pending CN115522441A (en) 2022-10-10 2022-10-10 Milling drum for a road milling machine

Country Status (1)

Country Link
CN (1) CN115522441A (en)

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