Tunnel asphalt mixture mixing plant

Abstract

This invention belongs to the field of highway application technology, and particularly relates to a tunnel asphalt mixture mixing device. It includes a frame and a mixing drum mounted on the frame. The mixing drum has an opening at the top and a discharge port at the bottom, with a sealing plate at the discharge port. The sealing plate is flipped up and positioned at the bottom of the mixing drum. A rotating shaft is installed inside the mixing drum, extending through one side and beyond the drum. A drive motor is connected to the end of the rotating shaft extending beyond the drum, and a stirring rod is mounted on the rotating shaft. This invention improves upon the structure of existing mixing devices by utilizing a dual-shaft structure to change the rotation state of the asphalt mixture within the mixing drum, combined with the uniform distribution of flame retardant via a flame retardant spreader. This allows the flame retardant to be quickly and evenly incorporated into the asphalt mixture, enabling its application on construction sites, reducing transportation costs, and thus minimizing segregation, thereby facilitating paving.

Description

Technical Field

[0001] The invention belongs to the technical field of highway application, and in particular relates to a tunnel asphalt mixture mixing device. Background Art

[0002] Highway tunnels refer to passages built underground or in mountains for vehicles to travel. The main structure of a highway tunnel is generally composed of a tunnel body, lining and tunnel portal. In areas where the tunnel entrance is prone to collapse, an open tunnel is also built. The tunnel's ancillary structures include waterproofing and drainage facilities, ventilation and lighting facilities, traffic signal facilities, and emergency facilities. Highway tunnel design usually starts with a schematic design, followed by specific designs such as the tunnel's plane and longitudinal section, clearance, and lining.

[0003] When a fire occurs in a tunnel, the temperature can reach over 800°C in a short period of time. Although asphalt is a flame-retardant substance in the air, it will burn at high temperatures, releasing a large amount of smoke and toxic gases. For this reason, the Technical Specifications for Highway Tunnel Construction (JTG / T3660-2020) put forward relevant requirements for tunnel pavement construction, namely, laying flame-retardant asphalt concrete pavement. Flame-retardant asphalt concrete pavement is a new technology suitable for paving flexible pavements in tunnels. That is, inorganic compound flame retardants are added to the asphalt mixture. At high temperatures, the inorganic compounds absorb heat and decompose to produce water, which can delay the high-temperature decomposition of asphalt, thereby achieving the purpose of flame retardancy and suppressing the generation of smoke.

[0004] However, most of the existing inorganic flame retardants are powder flame retardants. The density of powder flame retardants and asphalt is very different, and their compatibility is poor, which makes it easy for flame retardant asphalt to segregate during storage, transportation and use, thus affecting the paving quality. Therefore, it is necessary to build a mixing station as close to the construction site as possible to reduce segregation. However, the investment scale of the mixing station is large and the construction period is long. Therefore, it is not practical to build a mixing station. Therefore, how to build a small mixing device to facilitate the addition of inorganic flame retardants while reducing construction costs is the technical problem solved by this application. Summary of the invention

[0005] In view of the technical problems existing in the above-mentioned flame retardant asphalt mixture, the present invention proposes a tunnel asphalt mixture mixing device which has reasonable design, is convenient to process and is ingeniously designed and can meet the requirements of on-site mixing of flame retardant asphalt mixture.

[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 tunnel asphalt mixture mixing device, including a frame and a mixing barrel arranged on the frame, the top of the mixing barrel is opened, the bottom of the mixing barrel is provided with a discharge port, a sealing plate is provided at the discharge port, the sealing plate is flipped and arranged at the bottom of the mixing barrel, a rotating shaft is arranged in the mixing barrel, the rotating shaft passes through one side of the mixing barrel and extends out of the mixing barrel, the end of the rotating shaft extending out of the mixing barrel is connected to a driving motor, a stirring rod is arranged on the rotating shaft, the stirring rod is arranged on the rotating shaft at intervals, two parallel rotating shafts are arranged in the mixing barrel, the stirring rods on the two rotating shafts are staggered, and the two rotating shafts are arranged in opposite directions of rotation, a sealing cover is arranged on the top of the mixing barrel, the sealing cover is movably arranged on the top of the mixing barrel, a rotating motor is arranged in the sealing cover, and the rotating The rotating motor is a through-type hollow shaft motor, the top of the rotating motor hollow shaft is connected with a rotating joint, the rotating joint is fixed on the sealing cover, the other end of the rotating joint is connected with a flame retardant material pipe, the bottom of the rotating motor hollow shaft is connected with a flame retardant spreading seat, the rotating motor hollow shaft is provided with a discharge trough, the flame retardant spreading seat is provided in an inverted bullet-shaped shell, the top of the flame retardant spreading seat is provided with an opening, a connecting pipe is provided in the flame retardant spreading seat, the connecting pipe is connected with the hollow shaft of the rotating motor, a spreading trough is provided on the side wall of the flame retardant spreading seat, the spreading trough is evenly distributed on the side wall of the flame retardant spreading seat, the side wall of the flame retardant spreading seat is also provided with a guide wing, a guide groove is provided on the guide wing, the guide groove is arranged in an arc shape downward and the guide groove is arranged at intervals on the side wall of the guide wing, and the guide wing is arranged on both sides of the spreading trough.

[0007] Preferably, the stirring rod is arranged in an L shape.

[0008] Preferably, a fan is mounted on the hollow shaft of the rotating motor, and the fan is arranged above the flame retardant spreading seat.

[0009] Preferably, an electric heating plate is provided between the fan and the flame retardant spreading seat, and an electric heating wire is provided on the electric heating plate.

[0010] Preferably, a track is provided on the top of the mixing barrel, the track extends to above the driving motor, and the sealing cover is slidably arranged on the track.

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

[0012] 1. The present invention provides a tunnel asphalt mixture mixing device. By improving the structure of the existing mixing device and utilizing a double-shaft structure, the rotation state of the asphalt mixture in the mixing barrel is changed to coordinate with the uniform spreading of the flame retardant spreading seat, so that the flame retardant can be quickly and evenly mixed into the asphalt mixture. In this way, it can be used on the construction site, reducing transportation and further reducing segregation, thereby achieving the purpose of convenient paving. 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 tunnel asphalt mixture mixing device provided in Example 1;

[0015] Figure 2 A front view of the tunnel asphalt mixture mixing device provided in Example 1;

[0016] Figure 3 A schematic diagram of the structure of the rotating motor and the flame retardant dispersing seat provided in Example 1;

[0017] Figure 4 A front view of the rotating electrical machine and the flame retardant dispensing seat provided in Example 1;

[0018] Figure 5 An exploded view of the fan, electric heating plate and flame retardant dispensing seat provided in Example 1;

[0019] Figure 6 A top view of the flame retardant dispersing seat provided in Example 1;

[0020] In the above figures, 1, frame; 2, mixing barrel; 21, rotating shaft; 22, stirring rod; 23, driving motor; 24, reducer; 25, track; 3, sealing cover; 31, flame retardant material pipe; 4, rotating motor; 41, motor frame; 5, rotating joint; 6, fan; 7, electric heating plate; 71, discharge port; 8, flame retardant evenly spreading seat; 81, connecting pipe; 82, spreading trough; 83, guide wing; 84, guide trough; 85, spreading port. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] Embodiment 1, as Figure 1 to Figure 6 As shown, this embodiment aims to provide a mixing device capable of adding flame retardant to asphalt mixture on-site to reduce transportation. It should be noted that the on-site processing mentioned in this embodiment also refers to processing outside the tunnel to avoid reducing the air quality of the tunnel.

[0024] In order to achieve the above purpose, the tunnel asphalt mixture mixing device provided in this embodiment includes a frame 1 and a mixing barrel 2 arranged on the frame 1. The mixing barrel 2 is a commonly used horizontal mixing barrel 2 in a rectangular shape, and its top is open. The horizontal mixing barrel 2 is mainly used to facilitate unloading. The existing applicable asphalt mixture is mostly transported to the destination by trucks, while this embodiment mainly adds flame retardants on site on the basis of the existing ordinary asphalt mixture to reduce segregation. For this reason, the ordinary asphalt mixture used needs to be manufactured from a mixing plant and then transported to the site by truck. A discharge port 71 is provided at the bottom of the mixing barrel 2, and a sealing plate is provided at the discharge port 71. The sealing plate is flipped and arranged at the bottom of the mixing barrel 2 to achieve discharge.

[0025] A rotating shaft 21 is arranged in the mixing barrel 2, and the rotating shaft 21 passes through one side of the mixing barrel 2 and extends out of the mixing barrel 2. The end of the rotating shaft 21 extending out of the mixing barrel 2 is connected to a driving motor 23. Of course, this type of mixing does not require a large rotation speed. For this reason, a reducer 24 is connected to the power end of the driving motor 23, and the reducer 24 is connected to the rotating shaft 21. A stirring rod 22 is arranged on the rotating shaft 21, and the stirring rod 22 is arranged on the rotating shaft 21 at intervals. The above structure is a common structure, so it is not described in detail in this embodiment. Of course, it should be noted that the mixing barrel 2, like the existing asphalt mixing device, also has a heating function, which is not described because it does not belong to the content of the improvement of this embodiment.

[0026] Considering that the mixing device provided in the present embodiment is used for on-site processing, and the raw material used is the asphalt mixture that has been mixed, and only the flame retardant is added thereto, for this reason, the flame retardant needs to be added evenly, and the flame retardant is poured into the mixing barrel 2 in bags. Although the purpose of uniform mixing can be achieved under long-term stirring, the stirring efficiency is too slow and does not meet the requirements of on-site processing. Therefore, in order to ensure the uniform addition of the flame retardant and the improvement of the stirring effect, in the present embodiment, two parallel rotating shafts 21 are arranged in the mixing barrel 2, and the stirring rods 22 on the two rotating shafts 21 are staggered. The two rotating shafts 21 are arranged in opposite directions of rotation. Such an arrangement can drive the material to turn outward from the bottom or inward from the top, and then drive the material activity to a greater extent, increase the chance of the material being exposed on the surface, and then achieve the purpose of improving the stirring effect. In the present embodiment, considering factors such as the quality of the asphalt mixture, in the present embodiment, each rotating shaft 21 is connected to a driving motor 23, so that relative to the method of one motor driving the gear to realize the meshing rotation of two gears, its stability is better.

[0027] At the same time, in order to further improve the stirring effect, in the present embodiment, the stirring rod 22 is arranged in an L shape. At the same time, since the stirring rod 22 between the two rotating shafts 21 is staggered, the stirring rod 22 can drive more materials, which is more conducive to the exposure of the materials on the surface.

[0028] In the present embodiment, the main purpose of exposing the material on the surface is to make the flame retardant evenly spread downward from the top, so that the already uniform flame retardant can be used in combination with the constantly turning asphalt mixture to achieve rapid mixing. Therefore, in order to achieve the above purpose, a sealing cover 3 is provided on the top of the mixing barrel 2. The setting of the sealing cover 3 is mainly to prevent the flame retardant from leaving the mixing barrel 2 as much as possible during the spreading process, and the setting of the sealing cover 3 is used to limit the flame retardant.

[0029] The sealing cover 3 is movably arranged on the top of the mixing barrel 2. The reason why the sealing cover 3 is movably arranged on the top of the mixing barrel 2 is mainly because the top of the mixing barrel 2 is also a feeding port. If the sealing cover 3 is arranged above it, it will hinder the truck from unloading materials into the mixing barrel 2. For this reason, the sealing cover 3 is movably arranged above the mixing barrel 2. It can be removed from the mixing barrel 2 or slidably arranged on the mixing barrel 2. In this embodiment, a sliding arrangement is adopted. Specifically, a track 25 is arranged on the top of the mixing barrel 2. The track 25 is in the long side direction of the mixing barrel 2. Two tracks 25 are arranged. The track 25 extends to the top of the drive motor 23. The sealing cover 3 is slidably arranged on the track 25. In this way, when adding materials into the mixing barrel 2, the sealing cover 3 can completely clear the top of the mixing barrel 2 and be located above the driving motor 23. When it is needed, the sealing cover 3 enters the top of the mixing barrel 2. In this embodiment, the length of the mixing barrel 2 is greater than the length of the sealing cover 3. In this way, a power mechanism is required to pull the sealing cover 3 back and forth. There are many ways of moving. For example, a motor and a gear are set on the sealing cover 3, and a rack is set on the mixing barrel 2 to achieve reciprocating motion, or a motor is used to drive a pull rope structure to achieve reciprocating motion. This type of structure is relatively common, so it is not described in detail in this embodiment.

[0030] The sealing cover 3 is mainly provided to prevent the flame retardant from being scattered outside, so it is necessary to sprinkle the flame retardant inside the sealing cover 3. For this reason, in order to complete the sprinkling action, a rotating motor 4 is provided inside the sealing cover 3. In the present embodiment, the rotating motor 4 is a through-type hollow shaft motor. The main purpose of using the through-type hollow shaft motor is to use its hollow shaft to transfer the flame retardant. For this reason, a rotating joint 5 is connected to the top of the hollow shaft of the rotating motor 4. Of course, it is connected to the power end of the rotating joint 5. The fixed end of the rotating joint 5 is fixed on the sealing cover 3. The other end of the rotating joint 5 is connected to a flame retardant material pipe 31. The flame retardant material pipe 31 is connected to a negative pressure conveying mechanism to realize the conveying of the flame retardant. In the present embodiment, the rotating motor 4 is fixed on the sealing cover 3 by a motor seat.

[0031] In order to achieve uniform spreading of the flame retardant, a flame retardant uniform spreading seat 8 is connected to the bottom of the hollow shaft of the rotating motor 4. The flame retardant uniform spreading seat 8 is set in an inverted bullet-shaped shell. A connecting pipe 81 is set in the flame retardant uniform spreading seat 8. The connecting pipe 81 is coaxially arranged with the central axis of the flame retardant uniform spreading seat 8. The connecting pipe 81 is connected to the hollow shaft of the rotating motor. In this embodiment, the connecting pipe 81 and the hollow shaft of the rotating motor 4 are fixed by bolts. Specifically, a bolt is welded at the end of the hollow shaft of the rotating motor 4. The bolt passes through the connecting pipe 81 and the nut to achieve locking. At the same time, a discharge trough is set on the side wall of the hollow shaft of the rotating motor 4. In this way, the flame retardant enters the flame retardant uniform spreading seat 8.

[0032] In order to spread the flame retardant evenly, in the present embodiment, a spreading trough 82 is provided on the side wall of the flame retardant spreading seat 8. The spreading trough 82 is arranged in a long strip shape and is evenly distributed on the side wall of the flame retardant spreading seat 8. At the same time, a guide wing 83 is also provided on the side wall of the flame retardant spreading seat 8. The guide wing 83 adopts a structure that is wide at the top and narrow at the bottom. In this way, the spreading can be more even. At the same time, a guide groove 84 is provided on the guide wing 83. The guide groove 84 is arranged downward in an arc shape and the guide groove 84 is arranged at intervals on the side wall of the guide wing 83. The guide groove 84 has two purposes. One is to cooperate with the guide wing 83 to spread the material evenly, and the other purpose is to make the flame retardant move downward instead of moving sideways, so as to ensure the uniformity of the spreading while avoiding most of the flame retardant from being thrown onto the sealing cover 3. Of course, the guide wing 83 is arranged on both sides of the spreading trough 82.

[0033] Through the above-mentioned arrangement, the double-axis stirring method is used to achieve effective material turning, so that each part of the asphalt mixture can be exposed faster, and the reciprocating motion of the sealing cover 3 that evenly and quickly spreads the material can accelerate the addition and mixing of the flame retardant, thereby improving its efficiency.

[0034] In order to further prevent the flame retardant from being thrown out horizontally, in this embodiment, a fan 6 is also mounted on the hollow shaft of the rotating motor 4, and the fan 6 is arranged above the flame retardant spreading seat 8. In this way, the wind force is used to further blow the flame retardant downward to prevent it from being thrown onto the sealing cover 3 horizontally. At this time, the sealing cover 3 also has the function of collecting heat, collecting the heat of the asphalt mixture, and preventing the fanning of cold wind to reduce the fluidity of the asphalt mixture.

[0035] In order to further avoid the reduction of fluidity generated by the fan, an electric heating plate 7 is further arranged between the fan 6 and the flame retardant spreading seat 8, and an electric heating wire is arranged on the electric heating plate 7. In this embodiment, the electric heating plate 7 is composed of an intermediate tube, an outer tube and a connecting rod, and an electric heating wire is arranged on the connecting rod, which is similar to the structure of the existing electric heating hair dryer. A discharge port 71 is arranged on the intermediate tube, and the discharge port 71 is connected to the discharge trough on the rotating motor 4, so that the flame retardant enters the flame retardant spreading seat 8 from the discharge port 71. The main purpose of the design here is that when the discharge port 71 is arranged on the connecting tube 81, most of the flame retardant comes out from the spreading trough 82 at its outlet, and the uniformity is poor.

[0036] Through the above-mentioned settings, the on-site rapid mixing of the flame-retardant asphalt mixture is effectively achieved, which provides convenience for the construction of tunnel roads and solves the occurrence of segregation during long-distance transportation.

[0037] 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 tunnel asphalt mixture mixing device, comprising a frame and a mixing barrel arranged on the frame, the top of the mixing barrel is opened, the bottom of the mixing barrel is provided with a discharge port, a sealing plate is provided at the discharge port, the sealing plate is flipped and arranged at the bottom of the mixing barrel, a rotating shaft is arranged in the mixing barrel, the rotating shaft passes through one side of the mixing barrel and extends out of the mixing barrel, a driving motor is connected to one end of the rotating shaft extending out of the mixing barrel, a stirring rod is arranged on the rotating shaft, and the stirring rod is arranged on the rotating shaft at intervals, characterized in that: The mixing barrel is provided with two parallel rotating shafts, the stirring rods on the two rotating shafts are staggered, and the two rotating shafts are arranged in opposite directions. A sealing cover is provided on the top of the mixing barrel, and the sealing cover is movably arranged on the top of the mixing barrel. A rotating motor is provided in the sealing cover, and the rotating motor is a through-type hollow shaft motor. A rotating joint is connected to the top of the hollow shaft of the rotating motor, and the rotating joint is fixed on the sealing cover. The other end of the rotating joint is connected to a flame retardant material pipe, and the bottom of the hollow shaft of the rotating motor is connected to a flame retardant spreading seat. A discharge trough is arranged on the hollow shaft of the rotating motor, the flame retardant evenly spreading seat is arranged in the form of an inverted bullet-shaped shell, a connecting pipe is arranged inside the flame retardant evenly spreading seat, the connecting pipe is connected to the hollow shaft of the rotating motor, a spreading trough is arranged on the side wall of the flame retardant evenly spreading seat, the spreading troughs are evenly distributed on the side wall of the flame retardant evenly spreading seat, a guide wing is also arranged on the side wall of the flame retardant evenly spreading seat, a guide groove is arranged on the guide wing, the guide groove is arranged in an arc shape downward and the guide grooves are arranged at intervals on the side wall of the guide wing, and the guide wing is arranged on both sides of the spreading trough.

2. The tunnel asphalt mixture mixing device according to claim 1, characterized in that: The stirring rod is arranged in an L shape.

3. The tunnel asphalt mixture mixing device according to claim 1 or 2, characterized in that: A fan is also mounted on the hollow shaft of the rotating motor, and the fan is arranged above the flame retardant spreading seat.

4. The tunnel asphalt mixture mixing device according to claim 3, characterized in that: An electric heating plate is also arranged between the fan and the flame retardant spreading seat, and an electric heating wire is arranged on the electric heating plate.

5. The tunnel asphalt mixture mixing device according to claim 4, characterized in that: A track is arranged on the top of the mixing barrel, the track extends to the top of the driving motor, and the sealing cover is slidably arranged on the track.

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