Synchronous paving vehicle for ultrathin overlay emulsified asphalt bonding layer and high-viscosity asphalt mixture

Abstract

The invention belongs to the technical field of highway construction equipment application, and particularly relates to a synchronous paving vehicle for an ultrathin overlay emulsified asphalt bonding layer and a high-viscosity asphalt mixture. According to the synchronous paving vehicle for the ultra-thin overlay emulsified asphalt bonding layer and the high-viscosity asphalt mixture, air is heated by means of the temperature of the high-viscosity asphalt mixture in a heat exchange mode from the three angles of temperature, stirring and granularity, meanwhile, the ground on which the bonding layer is about to be sprayed is heated by the heated air, and the bonding layer is sprayed on the ground; and meanwhile, heated air is further provided to drive the high-pressure rotating spray head, so that the sprayed emulsified asphalt is further influenced by the heated air while being stirred at a high speed again, rapid demulsification is realized, and the paving speed is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of highway construction equipment application, and in particular relates to a vehicle for synchronously spreading an ultra-thin overlay emulsified asphalt bonding layer and a high-viscosity asphalt mixture. Background Art

[0002] Ultra-thin wearing layer maintenance construction technology is a method of paving ultra-thin, discontinuously graded hot-mixed asphalt mixture on a special modified emulsified asphalt membrane. It is characterized by the use of special equipment for one-time rapid operation, and traffic can be opened after 30 minutes of paving under normal temperature conditions. This technology combines the strength advantages of hot-mixed asphalt mixtures and the flexibility of ultra-thin maintenance treatment, better solves the problems of water sealing and drainage, and can be used for preventive maintenance and corrective maintenance of asphalt pavements.

[0003] In order to better cooperate with the use of ultra-thin wearing layer maintenance construction technology, people have designed a synchronous asphalt spreading paver. The machine has an asphalt spreading system configured on the paver, which can spread the asphalt mixture while spraying emulsified asphalt, avoiding the material truck sticking phenomenon that exists in distributed construction, and effectively improving the construction quality inside.

[0004] Although the existing synchronous asphalt spreading and paving machines can achieve synchronous spreading and paving, they move relatively slowly due to the demulsification speed of the emulsified asphalt. In order to increase the demulsification speed of the emulsified asphalt, people currently mainly improve the demulsification of the emulsified asphalt from two directions. One is to improve the formula of the emulsified asphalt itself, such as the {patent number: CN202310277964.X} published by the State Intellectual Property Office, a high-solid content fast-demulsification modified emulsified asphalt and its preparation method; the other is to improve the paver itself and accelerate the demulsification by mechanical means. Therefore, how to accelerate the rapid demulsification of the synchronous paving vehicle by mechanical means is a problem that needs to be solved at present. Summary of the invention

[0005] In view of the technical problem that synchronous paving cannot affect the demulsification efficiency, the present invention proposes a synchronous paving vehicle for an ultra-thin overlay emulsified asphalt bonding layer and a high-viscosity asphalt mixture, which has a reasonable design, is easy to modify and can effectively accelerate the demulsification of emulsified asphalt.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: the present invention provides a paving vehicle for synchronously spreading an ultra-thin overlay emulsified asphalt bonding layer and a high-viscosity asphalt mixture, comprising a paving vehicle body, the paving vehicle body is provided with a hopper for containing a high-viscosity asphalt mixture and an emulsified asphalt tank for containing emulsified asphalt, the paving vehicle body is also provided with a paving device for spreading the high-viscosity asphalt mixture and a spreading device arranged at the front end of the paving device, the spreading device comprises a nozzle for spraying emulsified asphalt, a heat exchanger is provided at the bottom of the hopper, the heat exchanger is arranged in a rectangular box shape, an air inlet is provided at the front end of the heat exchanger, and an exhaust port is provided at the rear end of the heat exchanger, the paving vehicle body is also provided with an injection pipe, the bottom of the injection pipe is connected with an injection disk, the injection disk is arranged on the injection pipe at intervals, the injection disk is arranged in front of the nozzle, the injection disk is arranged toward the ground, and the injection pipe is connected to the exhaust port of the heat exchanger.

[0007] Preferably, a high-pressure rotating nozzle is further provided in the nozzle, and the high-pressure rotating nozzle is connected to the injection pipe.

[0008] Preferably, the high-pressure rotary nozzle includes a connecting part, a dispersing part and an extension part arranged between the connecting part and the dispersing part, wherein the connecting part is arranged in a tubular shape, the dispersing part is arranged in a bullet shape, the dispersing part is provided with dispersing fins, the connecting part and the extension part are provided with spiral fins, and the extension part and the dispersing part are provided with spray holes.

[0009] Preferably, the inclination angle of the spiral wing is greater than that of the dispersion wing.

[0010] Preferably, a heat exchange tube is further provided in the heat exchanger. The heat exchange tube is generally in a rectangular tube shape. The heat exchange tube is high in the middle and low at both ends. The heat exchange tube is distributed in an S shape in the heat exchanger.

[0011] Compared with the prior art, the advantages and positive effects of the present invention are:

[0012] 1. The present invention provides a vehicle for paving an ultra-thin overlay emulsified asphalt bonding layer and a high-viscosity asphalt mixture synchronously. From the three perspectives of temperature, stirring and particle size, the temperature of the high-viscosity asphalt mixture is used to heat the air by heat exchange. At the same time, the heated air is used to heat the ground on which the bonding layer is to be sprayed, thereby improving the demulsification efficiency. At the same time, the heated air is further provided to drive a high-pressure rotary nozzle, so that the sprayed emulsified asphalt is stirred at a high speed again and is further affected by the hot air, thereby achieving rapid demulsification and improving the paving speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 A schematic diagram of the structure of a vehicle for synchronously spreading an ultra-thin overlay emulsified asphalt bonding layer and a high-viscosity asphalt mixture provided in Example 1;

[0015] Figure 2 A schematic diagram of the structure of the heat exchanger provided in Example 1;

[0016] Figure 3 A schematic diagram of the internal structure of the heat exchanger provided in Example 1;

[0017] Figure 4 A schematic diagram of the structure of the high-pressure rotary nozzle provided in Example 1;

[0018] In the above figures, 1. paver body; 11. hopper; 12. emulsified asphalt tank; 13. paving device; 14. spreading device; 141. nozzle; 2. heat exchanger; 21. air inlet; 22. exhaust port; 23. heat exchange tube; 24. support column; 3. jet pipe; 4. jet disc; 5. high-pressure rotary nozzle; 51. connecting part; 52. dispersion part; 53. extension part; 54. dispersion vane; 55. spiral vane; 56. spray hole. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0021] Embodiment 1, as Figure 1 to Figure 4 As shown, this embodiment aims to improve the crushing speed of emulsified asphalt from a physical point of view, so as to achieve the purpose of improving the construction speed of the synchronous asphalt spreading and paving machine. According to existing research, it can be known that emulsified asphalt is a thermodynamically unstable system, and many factors can cause its demulsification. From the formula of the coagulation and sedimentation speed of liquid droplets in the emulsified asphalt solution:

[0022]

[0023] Among them, V is the sedimentation rate of the particles; g is the acceleration of gravity; r is the radius of the particles; d1 and d2 are the densities of the asphalt and water phases respectively; η is the viscosity of the water phase. Then for a given emulsified asphalt, η is relatively constant, and the density difference between the asphalt and the water phase is basically constant. Then the only factor affecting the stability of the emulsion is the size of the emulsion droplets. However, the process of the droplets colliding with each other and aggregating to form larger droplets is irreversible. Therefore, it can be concluded that the main factors affecting the demulsification of emulsified asphalt are temperature, environmental humidity, mechanical vibration, etc., that is, the increase in temperature strengthens the Brownian motion of the droplets, reduces the interfacial viscosity between the droplets and the solution, and makes the droplets more likely to crack, which makes the emulsion more likely to demulsify.

[0024] In this embodiment, based on the implementation of the above three directions, the purpose of rapid demulsification of emulsified asphalt is achieved, thereby improving the construction speed. To this end, the ultra-thin overlay emulsified asphalt bonding layer provided in this embodiment is synchronized with the high-viscosity asphalt mixture paving vehicle. Like the existing synchronized paving vehicles, it includes a paving vehicle body, on which a hopper for holding high-viscosity asphalt mixture and an emulsified asphalt tank for holding emulsified asphalt are arranged. The hopper and the emulsified asphalt tank are generally arranged at the front end of the entire paving vehicle body. A paving device for paving high-viscosity asphalt mixture and a spreading device arranged at the front end of the paving device are also arranged at the rear end of the paving vehicle body. The spreading device includes a nozzle for spraying emulsified asphalt. The above structure is an existing common structure, and for this reason, it is not described in detail in this embodiment.

[0025] Taking into account that the temperature of high-viscosity asphalt mixture is generally between 140°C and 165°C, it is placed in a hopper, and then the transmission mechanism transmits it to the paving device for paving. Then, the temperature in the hopper can be fully utilized to increase the temperature of the emulsified asphalt during spraying and to increase the demulsification speed. Therefore, in order to achieve the above-mentioned purpose, in this embodiment, a heat exchanger is provided at the bottom of the hopper, and the heat exchanger is provided above the bottom plate of the hopper. In this way, the high-viscosity asphalt mixture is placed above the heat exchanger. In order not to affect the use of the high-viscosity asphalt mixture, in this embodiment, the heat exchanger is provided in a rectangular box shape, and an air inlet is provided at the front end of the heat exchanger. In this embodiment, in order to avoid the high-viscosity asphalt mixture blocking the air inlet, the air inlet is exposed outside the hopper. Due to the volatilization of the heat of the high-viscosity asphalt mixture itself, the air around it also has a certain temperature. In this way, the absorbed air itself has a certain temperature.

[0026] An exhaust port is provided at the rear end of the heat exchanger. At the same time, an air jet pipe is also provided on the paving vehicle body. The bottom of the air jet pipe is connected to an air jet disc. The air jet disc is provided in a disc shape, which is similar to the structure of an existing shower head. The air jet disc is provided on the air jet pipe at intervals. The air jet disc is provided in front of the nozzle and is provided toward the ground. The air jet pipe is connected to the exhaust port of the heat exchanger. Specifically, an air pump is provided between the air jet pipe and the heat exchanger. The air pump is used to continuously draw air into the heat exchanger. The heat exchanger is in direct contact with the high-viscosity asphalt mixture, which continuously heats the air. The heated air is sprayed onto the ground where the emulsified asphalt is to be sprayed, causing the ground temperature to rise, thereby increasing the temperature of the emulsified asphalt sprayed thereon, thereby improving the demulsification effect.

[0027] Considering that the purpose of rapid demulsification cannot be achieved by heating the ground alone, a high-pressure rotating nozzle is also provided in the nozzle, and the high-pressure rotating nozzle is connected to the jet pipe. Specifically, the connecting pipe of the high-pressure rotating nozzle is a metal pipe, which passes through the nozzle, so as to achieve the purpose of fixing the high-pressure rotating nozzle, and the high-pressure rotating nozzle rotates and sprays high-temperature air under the action of high-pressure air. Its rotation causes a certain amount of emulsified asphalt to be stirred, collided and fused, and the high-temperature gas also heats the emulsified asphalt, so that the purpose of temperature, mechanical vibration and partial fusion is achieved.

[0028] In order to improve the effect of mechanical vibration, in this embodiment, the high-pressure rotary nozzle includes a connecting portion, a dispersing portion, and an extension portion arranged between the connecting portion and the dispersing portion, wherein the connecting portion is arranged in a tubular shape, the dispersing portion is arranged in a bullet-shaped shape, the direction of the bullet head of the dispersing portion is arranged away from the connecting portion, and at the same time, the end of the dispersing portion is larger than the connecting portion, so that they are connected to form an extension portion. It should be noted that this embodiment only improves the appearance of the high-pressure rotary nozzle, and does not improve its internal bearing structure and the structure of the spiral channel. At the same time, in order to achieve a stirring effect, dispersing fins are arranged on the dispersing portion, spiral fins are arranged on the connecting portion and the extension portion, and spray holes are arranged on the extension portion and the dispersing portion. The setting of the spray hole is mainly to ensure rotation, and at the same time, better contact with the emulsified asphalt.

[0029] In order to disperse the high-temperature gas more, in this embodiment, the inclination angle of the spiral fins is greater than that of the dispersion fins. That is, the spiral fins are arranged horizontally, while the dispersion fins are arranged vertically. This is conducive to disrupting the direction of the high-temperature gas and making it contact with the emulsified asphalt better. At the same time, since the nozzle sprays towards the high-pressure rotating nozzle, it is also conducive to making more emulsified asphalt droplets collide and improving the emulsification effect.

[0030] In order to further improve the heat exchange effect, a heat exchange tube is also arranged in the heat exchanger. The heat exchange tube is arranged in a rectangular tube shape as a whole. The heat exchange tube is arranged in a high middle part and low at both ends. It should be noted that the top of the heat exchange tube is horizontal, so that it can better contact with the top plate and obtain more heat. At the same time, heat transfer oil is provided in the heat exchange tube. At the same time, the heat exchange tube is distributed in an S shape in the heat exchanger. In this way, the heat exchange area can be increased and the heat exchange effect can be improved. In this embodiment, considering that the middle part of the heat exchange tube alone may not be able to provide effective support, support columns are arranged at both ends of the heat exchange tube to make it contact with the bottom plate of the heat exchanger, thereby improving the stability of the entire heat exchanger structure.

[0031] Through the above-mentioned settings, the demulsification effect of emulsified asphalt is processed in three directions, thereby improving the crushing effect of emulsified asphalt and accelerating the construction speed of synchronous paving.

[0032] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A paving vehicle for synchronously spreading an ultra-thin overlay emulsified asphalt bonding layer and a high-viscosity asphalt mixture, comprising a paving vehicle body, the paving vehicle body being provided with a hopper for containing a high-viscosity asphalt mixture and an emulsified asphalt tank for containing emulsified asphalt, the paving vehicle body being further provided with a paving device for spreading the high-viscosity asphalt mixture and a spreading device arranged at the front end of the paving device, the spreading device comprising a nozzle for spraying emulsified asphalt, characterized in that: A heat exchanger is provided at the bottom of the hopper, and the heat exchanger is provided in a rectangular box shape. An air inlet is provided at the front end of the heat exchanger, and an exhaust port is provided at the rear end of the heat exchanger. An air jet pipe is also provided on the paving vehicle body, and a jet disk is connected to the bottom of the jet pipe. The jet disk is arranged on the jet pipe at intervals, and the jet disk is arranged in front of the nozzle, and the jet disk is arranged toward the ground, and the jet pipe is connected to the exhaust port of the heat exchanger.

2. The ultra-thin overlay emulsified asphalt bonding layer and high-viscosity asphalt mixture synchronous paving vehicle according to claim 1 is characterized in that: A high-pressure rotating nozzle is also arranged in the nozzle, and the high-pressure rotating nozzle is connected with the nozzle pipe.

3. The ultra-thin overlay emulsified asphalt bonding layer and high-viscosity asphalt mixture synchronous paving vehicle according to claim 2 is characterized in that: The high-pressure rotary nozzle includes a connecting part, a dispersing part and an extension part arranged between the connecting part and the dispersing part, wherein the connecting part is arranged in a tubular shape, the dispersing part is arranged in a bullet shape, the dispersing part is provided with dispersing fins, the connecting part and the extension part are provided with spiral fins, and the extension part and the dispersing part are provided with spray holes.

4. The ultra-thin overlay emulsified asphalt bonding layer and high-viscosity asphalt mixture synchronous paving vehicle according to claim 3 is characterized in that: The inclination angle of the spiral wing is greater than that of the dispersion wing.

5. The ultra-thin overlay emulsified asphalt bonding layer and high-viscosity asphalt mixture synchronous paving vehicle according to any one of claims 1 to 4, characterized in that: The heat exchanger is further provided with a heat exchange tube, which is in a rectangular tube shape as a whole, with a high middle portion and low ends, and is distributed in an S shape in the heat exchanger.

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