WO2013078908A1

WO2013078908A1 - Asphalt mixing method and device

Info

Publication number: WO2013078908A1
Application number: PCT/CN2012/082098
Authority: WO
Inventors: 尹友中; 江艳平; 朱春灿; 黄楚春
Original assignee: 中联重科股份有限公司; 湖南中联重科专用车有限责任公司
Priority date: 2011-12-01
Filing date: 2012-09-26
Publication date: 2013-06-06
Also published as: CN102367647A

Abstract

An asphalt mixing device and an asphalt mixing method. The asphalt mixing device comprises a mixing tank (1), multiple storage tanks (6) and an asphalt pipeline (9). An asphalt mixture outlet (214) is arranged on the bottom of the mixing tank (1); the storage tanks (6) are connected to the asphalt mixture outlet (214) of the mixing tank (1) via the asphalt pipeline (9); a mixing propeller (23) for mixing the asphalt and admixtures added into the mixing tank (1) is arranged in the mixing tank (1); the asphalt mixture which has been mixed in the mixing tank (1) is transported into the storage tanks (6) via the asphalt mixture outlet (214) and the asphalt pipeline (9). The mixing tank (1) of the asphalt mixing device has smaller volume than the storage tanks (6), so asphalt may be fully and uniformly mixed. Besides, a mixing device (7) is arranged in a storage tank (6) and it can be ensured that the admixtures are uniformly and stably dispersed in the asphalt through rotation of the mixing device (7), thereby reducing the phenomenon such as layering, agglomeration or segregation.

Description

Asphalt mixing method and equipment

Technical field

The invention relates to the technology of building and maintenance road equipment, in particular to an asphalt mixing method and equipment. Background technique

In modern transportation, high flow, heavy load, high speed, environmental differences, etc. put forward higher requirements on asphalt pavement, such as high temperature stability, low temperature crack resistance, anti-aging, anti-fatigue, anti-stripping ability, easy maintenance Wait. In order to meet this requirement, the asphalt must be modified to improve the rheological properties of the asphalt, improve the adhesion of the asphalt to the aggregate, and extend the durability of the asphalt. Therefore, various additives are added to the matrix asphalt to make It meets different usage requirements.

The admixture and the bitumen need to be mixed and compatible at a certain high temperature. At the same time, as the admixture is continuously added, it is necessary to continuously stir, so that the admixture and the bitumen are thoroughly mixed uniformly.

In order to solve the above-mentioned technical problems in the prior art, the Chinese Patent Publication No. CN 201245808 Y discloses a rubber modified asphalt device including a rubber powder hoist, a horizontal mixing tank, and an automatic The circulating shear pump, the transfer pump, the control unit, and the hot oil delivery pump are equipped with a rubber powder agitator in the horizontal mixing tank, and a paddle agitator is provided at the same time, and the number of the rubber powder agitator is two or more. However, in the above rubber modified asphalt plant, the tank volume of the horizontal agitating tank is large, the agitation is difficult to be uniform, and the agitated asphalt mixture stays in the horizontal agitating tank, and segregation and sedimentation may occur. Summary of the invention

SUMMARY OF THE INVENTION The object of the present invention is to provide an asphalt mixing method and apparatus for solving the problem that the asphalt mixture is unevenly distributed and the asphalt mixture after stirring is prone to segregation and precipitation.

The invention provides an asphalt mixing device, which comprises a stirring tank, a storage tank, and an asphalt pipeline. The agitating tank is provided with an asphalt mixture outlet, and the storage tank is connected to the asphalt mixture outlet of the agitating tank through an asphalt pipeline, and the stirring tank is provided with a stirring paddle for stirring the asphalt and the additive added to the stirring tank. The pitch mixture completed in the stirred tank is conveyed to the storage tank through the asphalt mixture outlet and the asphalt pipeline.

As a further improvement of the present invention, the agitating paddle is provided with at least two layers of blades, wherein the blades of one blade are perpendicular to the horizontal plane, and the blades of the other blade are at an acute angle with the horizontal plane, the at least two layers An anchor plate is vertically disposed on the periphery of the blade.

As a further improvement of the present invention, the agitating paddle is provided with a double-layered blade including a lower blade and an upper blade, and the blade of the lower blade is perpendicular to the horizontal plane, and the blade of the upper blade is at an acute angle to the horizontal.

As a further improvement of the present invention, the asphalt stirring apparatus further includes a heating device that heats the stirring tank and the storage tank.

As a further improvement of the present invention, the heating device comprises a hot oil pipeline and a hot oil furnace, and the inner wall of the stirring tank and the storage tank is provided with a hot oil passage, and the hot oil passage is connected to the hot oil pipeline, the heat The oil furnace heats the stirring tank and the storage tank through the hot oil pipeline and the hot oil passage.

As a further improvement of the present invention, the asphalt mixture outlet is disposed at the bottom of the tank body of the agitating tank, and the agitating tank is further connected with a bypass pipe, one end of the bypass pipe is connected with the asphalt mixture outlet, the bypass The other end of the tube enters the tank from the top of the tank of the stirred tank, and the asphalt mixture in the stirred tank flows out of the asphalt mixture outlet and returns to the stirred tank through the bypass pipe to form a self-circulation.

As a further improvement of the present invention, the number of the storage tanks is plural, and the storage tanks are connected to each other by a pitch pipe.

As a further improvement of the present invention, a stirring device is provided in the storage tank.

As a further improvement of the present invention, the agitating tank is provided with an admixing agent inlet and an admixing agent weighing system, and the admixing agent weighing system comprises an admixing agent weighing and measuring device, and the admixing agent inlet and the admixing agent are weighed and measured. The devices are connected.

The invention also provides an asphalt stirring method, comprising the following steps: The storage tank is connected to the asphalt mixture outlet of the stirred tank through the asphalt pipeline; the asphalt and the additive added to the stirred tank are stirred by the stirring paddle;

The pitch mixture which has been stirred in the stirred tank is conveyed to the storage tank through the asphalt mixture outlet and the asphalt line.

As a further improvement of the present invention, the method further includes connecting a bypass pipe to the agitating tank, and communicating one end of the bypass pipe with an asphalt mixture outlet provided at a bottom of the tank of the agitating tank, so that the bypass pipe The other end enters the tank from the top of the tank of the stirred tank, and the asphalt mixture in the stirred tank flows out from the asphalt mixture outlet and returns to the stirred tank through the bypass pipe to form a self-circulation.

As a further improvement of the present invention, it is further included that a stirring device is installed in the storage tank, and the asphalt mixture in the storage tank is stirred by the stirring device.

The beneficial effects of the invention are as follows: the mixing tank has a smaller volume than the storage tank, and the stirring is sufficient and uniform through the stirring paddle in the stirring tank; in addition, the stirring device can be installed in the storage tank, and the stirring device can be rotated by the stirring device. It can ensure that the admixture is uniformly and stably dispersed in the asphalt without delamination, aggregation or segregation.

The above description is only an overview of the technical solutions of the present invention, and the technical means of the present invention can be more clearly understood, and can be implemented in accordance with the contents of the specification, and the above and other objects, features and advantages of the present invention can be more clearly understood. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a plan view showing the layout of an asphalt mixing plant in accordance with a preferred embodiment of the present invention.

Figure 2 is a schematic view showing the structure of the stirring tank and the additive weighing system of Figure 1.

Figure 3 is a cross-sectional view taken along line ΙΠ-ΙΠ in Figure 2.

4 is a schematic structural view of the storage tank of FIG. 1. detailed description

In order to further illustrate the technical means and efficacy of the present invention for achieving the intended purpose of the invention, the specific embodiments, structures, features and the details of the asphalt mixing method and apparatus according to the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Efficacy, detailed description as follows.

1 is a plan layout view of an asphalt mixing apparatus according to a preferred embodiment of the present invention, the apparatus comprising a stirring tank 1, a plurality of storage tanks 6, a first asphalt pump 3, a second asphalt pump 11, a hot oil furnace 5, and The weighing system 12, the plurality of valves 8, the asphalt pipeline 9 and the hot oil pipeline 4 are composed of the same.

The agitating tank 1 is connected to each storage tank 6 through an asphalt pipeline 9, a first asphalt pump 3, and a valve 8, and each storage tank 6 is connected to each other through an asphalt pipeline 9 and a valve 8; each storage tank 6 is well-processed. The modified asphalt is transported by the second asphalt pump 11 to the use site.

The admixture weighing system 12 is mounted on the agitating tank 1, and the admixture weighing system 12 includes an admixture storage bin 121 and an admixture weighing and metering device 122; the admixture weighing system 12 can be multiple to meet the simultaneous addition An admixture.

The hot oil furnace 5 heats the pitch in the agitating tank 1 and each storage tank 6 through the hot oil line 4. Referring to Fig. 2, the agitating tank 1 is provided with a stirring paddle 23 which is connected to a stirring motor 21 disposed outside the top of the agitating tank 1. The agitating paddle 23 is provided with a double paddle, including a lower paddle 26 and an upper paddle 25, and an anchor plate 24 is vertically disposed around the periphery of the double paddle. Wherein, the lower blade 26 is uniformly arranged along the circumference by four blades, and the blade is at an angle of 90° perpendicular to the horizontal plane; the upper blade 25 is uniformly arranged along the circumference by four blades, and the blade is at an acute angle with the horizontal plane, for example, 30 An angle of from ° to 60, preferably, the blade is at an angle of 45 to the horizontal. The turbulent, diffusing and shearing action of the asphalt in the agitating tank 1 is effected by the rotary agitation of the double-layered blades, and the anchoring plate 24 reinforces the double-layered blade and further agitates the asphalt. In other embodiments, the paddle 23 can be fitted with more than two blades.

The tank top of the agitating tank 1 is provided with an asphalt inlet 29, an admixture inlet 22, a liquid level gauge 28, and an observation port and an air outlet (not shown). The bottom of the agitating tank 1 is provided with an asphalt mixture outlet 214, an asphalt sewage outlet 217, and a thermometer 27, and each storage tank 6 passes through the asphalt pipeline 9 and the asphalt of the agitating tank 1. Mixture outlet 214 is connected. The admixture inlet 22 of the can top is coupled to the admixture weighing metering device 122 of the admixture weighing system 12, and the admixer inlet 22 may be one or more to accommodate the simultaneous addition of different admixtures.

The inner wall of the tank of the stirring tank 1 is provided with a hot oil passage 211, and the hot oil passage 211 is connected with the hot oil line 4 to heat the asphalt in the tank. The side wall of the stirring tank 1 is provided with a hot oil inlet 212 and a hot oil inlet. A hot oil outlet 210 above 212. The hot oil passage 211 is a spiral coil made of steel pipe, arranged along the inner wall of the tank to form an inner cavity, which can directly heat the inner wall of the stirring tank 1 and the asphalt, and the heating area is increased, the heating is more uniform, and the heating is more favorable. The agent is mixed with asphalt. The shape of the hot oil passage 211 may be U-shaped, semi-circular or other shapes. The outer wall of the mixing tank 1 is also covered with an asbestos insulation layer 215 to keep the tank warm.

The agitating tank 1 can be used as a stirring tank for making modified asphalt, or as a transfer tank for asphalt when no modified asphalt is produced, and is used for receiving and transporting asphalt in the asphalt vehicle, and then transporting it through the first asphalt pump 3. To each storage tank 6.

Referring to FIG. 3 at the same time, the bypass pipe 213 is connected to the agitating tank 1, and one end (first end) of the bypass pipe 213 communicates with the asphalt mixture outlet 214 provided at the bottom of the tank body of the agitating tank 1, and the bypass pipe 213 The other end (second end) enters the tank from the top of the tank of the stirred tank 1. In this embodiment, the first end of the bypass pipe 213 is connected to the asphalt pipe 9 and communicates with the asphalt pipe 9, and the end of the second end of the bypass pipe 213 is bent to form a bent portion, and the bending is performed. The portions are circumferentially arranged along the inner wall of the agitating tank 1. The asphalt mixture in the tank can be discharged from the asphalt mixture outlet 214 to the asphalt pipeline 9 through the first asphalt pump 3, and returned to the agitating tank 1 through the bypass pipe 213 to form a self-circulation, by stirring the inner blade of the tank 1 Stirring and self-circulation of the asphalt in the tank, the asphalt and the admixture in the stirring tank 1 are sufficiently stirred uniformly. After the asphalt mixture is sufficiently stirred in the stirring tank 1, the valve 8 connected to each storage tank 6 is opened to make the asphalt The mixture is conveyed through the asphalt line 9 into each storage tank 6.

Referring to Fig. 4, each storage tank 6 is provided with three sets of stirring devices 7, each of which includes a stirring shaft 75 and vanes 76. The vane 76 is connected to a stirring motor 74 mounted on the outer side of the top of the storage tank 6 via a stirring shaft 75. The blade 76 is 2 layers, each blade is 4 to 6 pieces, using a stirring motor 74 drives the agitating shaft 75 and the vanes 76 to rotate, and the modified asphalt in the storage tank 6 is stirred. The storage tank 6 is installed in a horizontal form, and the storage tank 6 is provided with a hot oil passage 77 which is spirally formed by a steel pipe and arranged along the inner wall of the tank. The hot oil passage 77 is connected to the hot oil pipeline 4 to heat the asphalt in the tank. The outer wall of the storage tank 6 is covered with an asbestos insulation layer to keep the tank warm.

The top of the tank is provided with an observation hole 73 and a liquid level meter 712. The end surface of the tank body is provided with a hot oil inlet 72, a hot oil outlet 71, and an asphalt inlet 710, and the other end surface is provided with an asphalt outlet 79 and an asphalt return port 78. .

Preferably, the first asphalt pump 3 and the second asphalt pump 11 are screw asphalt pumps having heating and heat preservation functions, and are mainly used for conveying materials. The admixture weighing system 12 is a solid flow meter, such as a star discharger, which controls the flow of the product by controlling the speed of the motor. The asphalt line 9 is a double-layer temperature-proof casing.

The bitumen in the agitating tank 1 can be from an asphalt carrier, the amount of bitumen is measured by the level gauge 28 of the agitating tank 1, and the bitumen in the agitating tank 1 is heated to a desired temperature by the hot oil line 4, and the admixture weighing system 12 The weighing amount of the dosing agent is weighed and added to the stirring tank 1, and the stirring motor 21 drives the stirring paddle 23 to rotate, and the asphalt and the admixture are uniformly stirred, and the asphalt in the tank can be self-circulated by the bypass pipe 213. After the asphalt and the admixture are uniformly mixed, they are transported to the respective storage tanks 6. After the modified asphalt in the stirred tank 1 is sucked, the matrix asphalt and the admixture are added to the stirred tank 1 for a new round of circulation.

The asphalt stirring method of the preferred embodiment of the present invention comprises the steps of: connecting the storage tank 6 to the asphalt mixture outlet 214 of the agitating tank 1 through the asphalt pipeline 9; and using the stirring paddle 23 to add the asphalt and the admixture in the stirring tank 1 Stirring is performed; and the pitch mixture stirred in the stirred tank 1 is conveyed into the storage tank 6 through the asphalt mixture outlet 214 and the asphalt line 9. In other embodiments, the method further includes connecting a bypass pipe 213 to the agitating tank 1 such that the first end of the bypass pipe 213 communicates with the asphalt mixture outlet 214 provided at the bottom of the tank of the agitating tank 1 to The second end of the through pipe 213 enters the tank from the top of the tank of the agitating tank 1, so that the asphalt mixture in the agitating tank 1 flows out from the asphalt mixture outlet 214 and returns to the inside of the agitating tank 1 through the bypass pipe 213 to form a self-circulation. In addition, the above method may further comprise installing a stirring device 7 in the storage tank 6, using a stirring device 7 The asphalt mixture in the storage tank 6 is stirred.

In other embodiments, the stirring structure and the stirring mode of the stirring tank 1 and the storage tank 6 may be different from the above, and the number of the stirring devices may be different; the adding method of the adding agent may also adopt a device such as pneumatic conveying, spiral pipe conveying, and the like. The metering method of the admixture can also be measured by weighing such as hopper and sensor; the metering method of the asphalt can also be to install a flow meter on the asphalt line 9 to measure the amount of asphalt; the arrangement of the feeding port and the discharging port The method can also be different from the above, as long as a structure that integrates agitation, addition, and metering can be achieved as an alternative.

In the above embodiment, the pitch in the agitating tank 1 and the storage tank 6 is heated by a heating means composed of a hot oil line 4, a hot oil furnace 5, a hot oil passage 211 (77), and the like. In other embodiments, the heating mode of the agitating tank 1 and the storage tank 6 may be different from the above, for example, by electric heating or the like.

In the asphalt stirring method and equipment of the present invention, the mixing tank 1 has a smaller volume than the storage tank 6, and is easily and sufficiently agitated by the stirring paddle 23 in the stirring tank 1; the storage tank 6 is provided with a stirring device 7 through the stirring device The rotation of 7 ensures that the admixture is uniformly and stably dispersed in the asphalt without delamination, agglomeration or segregation.

According to the asphalt stirring method and equipment of the present invention, each admixture is separately and accurately weighed and metered on-line, and then transferred into the agitation tank 1 to strictly control the addition amount of each admixture to ensure stable quality of the modified asphalt.

In the asphalt mixing method and equipment of the present invention, the stirring tank 1 is provided with a stirring blade 23, and the stirring blade 23 is provided with a plurality of blades, and the angle between the multi-layer blades and the horizontal plane is different, and the periphery of the multi-layer blade is vertical. An anchor plate 24 is disposed, and the turbulent, diffusing and shearing action of the asphalt in the agitating tank 1 is performed by the rotary agitation of the blades, so that the asphalt and the admixture in the agitating tank 1 are uniformly stirred. Stirring tank 1 Integrates material addition and mixing, simplifies the structure of the plant, and performs asphalt reforming on site, saving time and energy.

The asphalt stirring method and equipment of the present invention, the hot oil passage 211 in the stirring tank 1 and the hot oil passage 77 in the storage tank 6 are arranged along the inner wall, the heating area is large, the heating is rapid, and the inner wall is hovered. The arrangement is equivalent to adding an inner layer to the tank, so that no part of the admixture remains, and the modified asphalt will not be aged, thereby ensuring the quality of the modified asphalt.

In the asphalt mixing method and equipment of the present invention, the bypass pipe 213 enters the tank from the bottom end portion of the agitating tank 1, and is arranged tangentially along the inner wall of the tank, and the asphalt in the tank can be self-circulated through the first asphalt pump 3, and the stirring tank is The asphalt and admixture in 1 are stirred evenly.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, any A person skilled in the art can make some modifications or modifications to equivalent embodiments by using the above-disclosed technical contents without departing from the technical scope of the present invention. It is still within the scope of the technical solution of the present invention to make any simple modifications, equivalent changes and modifications to the above embodiments.

Claims

Rights request

An asphalt mixing device comprising an agitating tank, a storage tank, and an asphalt pipeline, wherein the agitating tank is provided with an asphalt mixture outlet, wherein: the storage tank passes through an asphalt mixture outlet of the asphalt pipeline and the agitating tank Connected, the stirring tank is provided with a stirring paddle for stirring the asphalt and the additive added to the stirring tank, and the pitch mixture stirred in the stirring tank is transported into the storage tank through the asphalt mixture outlet and the asphalt pipeline.

2. The asphalt mixing apparatus according to claim 1, wherein: the agitating paddle is provided with at least two layers of blades, wherein blades of one blade are perpendicular to a horizontal plane, and blades and a horizontal plane of the other blade are At an acute angle, the periphery of the at least two layers of blades is vertically arranged with an anchor plate.

3. The asphalt mixing apparatus according to claim 2, wherein: the agitating paddle is provided with a double-layer blade, including a lower blade and an upper blade, and the blade of the lower blade is perpendicular to a horizontal plane, and the upper blade is The blade is at an acute angle to the horizontal.

4. The asphalt mixing apparatus according to claim 1, wherein: the asphalt stirring apparatus further comprises heating means for heating the stirring tank and the storage tank.

The asphalt mixing device according to claim 4, wherein: the heating device comprises a hot oil pipe and a hot oil furnace, and the inner wall of the agitating tank and the storage tank is provided with a hot oil passage, the hot oil The passage is connected to the hot oil line, and the hot oil furnace heats the stirring tank and the storage tank through the hot oil pipeline and the hot oil passage.

The asphalt mixing device according to claim 1, wherein: the asphalt mixture outlet is disposed at a bottom of the tank body of the agitating tank, and the stirring tank is further connected with a bypass pipe, and one end of the bypass pipe Connected to the outlet of the asphalt mixture, the other end of the bypass tube is fed from the top of the tank of the stirred tank Into the tank, the asphalt mixture in the stirred tank flows out from the asphalt mixture outlet and returns to the stirred tank through the bypass pipe to form a self-circulation.

7. The asphalt mixing plant according to claim 1, wherein: the number of the storage tanks is plural, and the storage tanks are connected to each other by an asphalt pipeline.

8. The asphalt mixing plant according to claim 1, wherein: the storage tank is provided with a stirring device.

9. The asphalt mixing apparatus according to claim 1, wherein: the agitating tank is provided with an admixture inlet and an admixture weighing system, and the admixture weighing system comprises an admixing agent weighing and measuring device. The admixture inlet is connected to the admixture weighing device.

10. An asphalt mixing method comprising the steps of:

Connecting the storage tank to the asphalt mixture outlet of the stirred tank through the asphalt pipeline;

Stirring the asphalt and admixture added to the stirred tank with a stirring paddle; and

11. The asphalt mixing method according to claim 10, further comprising: connecting a bypass pipe to the agitating tank to make one end of the bypass pipe and the asphalt provided at the bottom of the tank of the agitating tank The mixture outlet is connected, the other end of the bypass pipe is introduced into the tank from the top of the tank of the stirred tank, and the asphalt mixture in the stirred tank is discharged from the asphalt mixture outlet and returned to the stirred tank through the bypass pipe to form cycle.

12. The asphalt mixing method according to claim 10, further comprising: storing