Heating structure utilizing engine tail gas and asphalt transfer trolley

Abstract

The invention discloses a heating structure utilizing engine tail gas in the field of asphalt transfer trucks, which comprises a gas path channel arranged at the bottom of a storage bin and a shunt box connected with an engine exhaust pipe, the shunt box is externally connected with a heating pipe and a tail gas pipe, the heating pipe is communicated with the gas path channel, the other end of the gas path channel is provided with an exhaust port, and the exhaust port is communicated with the tail gas pipe. The tail gas pipe is communicated with outside air; the flow dividing box comprises a box body and a reversing valve used for controlling connection and disconnection between the heating pipe and the box body and between the tail gas pipe and the box body. And when one of the heating pipe and the tail gas pipe is not communicated with the box body, the other one of the heating pipe and the tail gas pipe is communicated with the box body. The reversing valve is arranged to control connection and disconnection of the box body, the tail gas pipe and the heating pipe, in the process that the reversing valve controls connection and disconnection, one of the tail gas pipe and the heating pipe is always connected with the box body, it is ensured that gas entering the flow dividing box can be normally exhausted, and it is avoided that gas flows back into an engine, and safety accidents happen.

Description

Technical Field

[0001] The present invention relates to the field of asphalt transfer vehicles, and particularly to a heating structure using engine exhaust gas and an asphalt transfer vehicle. Background Art

[0002] With the continuous development of the road construction industry, the construction quality requirements for asphalt concrete pavements are increasing day by day. During the transportation and paving of asphalt concrete, temperature control is one of the key factors affecting pavement quality. At present, traditional asphalt transfer vehicles require multi-stage conveyor belts for conveying and waiting during the unloading process. During this process, the asphalt mixture will experience a large temperature drop, which will make it difficult to distribute evenly during paving, thus affecting the smoothness and compaction of the pavement. Most existing solutions are to add a simple heat insulation layer at the bottom of the transfer vehicle conveyor belt.

[0003] In the existing publicly disclosed patents, it is not uncommon to use engine exhaust gas to heat asphalt concrete. Using engine exhaust gas for heating is both environmentally friendly and convenient. For example, in the patent with the title "Exhaust Gas Induction Device for Asphalt Transport Vehicle and Asphalt Heating System" and the application number "202011383170.4", a first brake valve and a second brake valve are used to control the exhaust gas input into the cargo box to heat the asphalt or discharge it into the air.

[0004] During use, when the brake valve is closed and cannot be opened, the engine is still running, and the high-temperature gas generated cannot be discharged, flowing back into the engine, resulting in the risk of engine damage or explosion, and the safety is not high. Summary of the Invention

[0005] The purpose of the present invention is to provide a heating structure using engine exhaust gas. By setting a reversing valve, one of the tail gas pipe and the heating pipe is always connected to the box body, ensuring that the gas entering the shunt box can be discharged normally.

[0006] To solve the above technical problems, the following technical solutions are adopted: In a first aspect, the present invention provides a heating structure using engine exhaust gas, including: an air passage provided on a storage bin and a shunt box connected to the exhaust pipe of the engine. The shunt box is externally connected with a heating pipe and a tail gas pipe. The heating pipe is communicated with the air passage, and the other end of the air passage is provided with an exhaust port. The tail gas pipe is communicated with the outside air; The shunt box includes a box body for installing the heating pipe and the tail gas pipe and a reversing valve for controlling the on-off of the heating pipe and the tail gas pipe with the box body; One end of the exhaust pipe connected to the box body is a reduced-diameter pipe structure for reducing gas backpressure; Wherein, when one of the heating pipe or the tail gas pipe is not connected to the box body, the other is connected to the box body.

[0007] Optionally, the gas path channel includes two U-shaped channels, and the two U-shaped channels form an unclosed rectangular structure. The first ends of the two U-shaped channels are respectively connected to the heating pipes on both sides of the box body, and tail gas pipes are provided on both sides of the box body.

[0008] Optionally, the reversing valve includes a linear driver, a movable bracket, and a valve. The linear driver is used to drive the movable bracket to perform a linear motion. The valve is connected to the movable bracket, and the movable bracket drives the valve to move so as to control the on-off of the heating pipe and the tail gas pipe.

[0009] Optionally, the movable bracket includes a straight rod and support rods located at both ends of the straight rod. The support rods are perpendicular to the straight rod, and guide chutes are provided at the other ends of the support rods. The guide chutes are movably connected to the reversing valve.

[0010] Optionally, the support rods at both ends of the straight rod are respectively located on the upper and lower surfaces of the box body, and the guide chutes are also located on the surface of the box body. Limit blocks for restricting the up and down movement of the support rods are provided on both the upper and lower surfaces of the box body.

[0011] Optionally, the valve includes a valve plug plate, a steering shaft, and a connecting rod. Two valve plug plates are provided on the steering shaft. The two valve plug plates are respectively used to disconnect the connection between the heating pipe and the tail gas pipe and the box body. Vertical connecting rods are provided at both ends of the steering shaft. Pulleys are provided at the other ends of the connecting rods. The pulleys on the two connecting rods are arranged face to face. The pulleys are arranged on the movable bracket. When the movable bracket performs a linear motion, the steering shaft performs a rotational motion, thereby driving the valve plug plate to control the on-off of the heating pipe and the tail gas pipe.

[0012] Optionally, the included angle between the two valve plug plates is 90°. When the steering shaft rotates until one of the valve plug plates is located at the air inlet of the heating pipe or the tail gas pipe, the other valve plug plate is away from the air inlet of the tail gas pipe or the heating pipe, so that gas can be discharged from one of the tail gas pipe or the heating pipe.

[0013] Optionally, the rotating shaft on the valve is installed on the inner side edge of the shunt box. The two ends of the rotating shaft extend out from the upper and lower surfaces of the box body. The connecting rods at both ends are respectively located on the upper and lower surfaces of the box body. The pulleys on the connecting rods cooperate with the movable bracket.

[0014] Optionally, a muffler is provided on the exhaust pipe.

[0015] In a second aspect, the present invention provides an asphalt transfer vehicle, including the heating structure using engine exhaust gas described in the first aspect.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention: 1. The present invention controls the on - off of the connection between the box body, the tail gas pipe and the heating pipe by setting a reversing valve. During the process of the reversing valve controlling the on - off, there is always one of the tail gas pipe and the heating pipe connected to the box body, ensuring that the gas entering the shunt box can be discharged normally, preventing the gas from flowing back into the engine and causing safety accidents. One end of the exhaust pipe connected to the box body in the present invention adopts a stepped - diameter pipe structure, which can effectively reduce the gas back - pressure input into the box body, avoid damage to the internal structure of the box body due to excessive gas back - pressure, and improve the durability of the equipment.

[0017] 2. The present invention closes the nozzles of the tail gas pipe and the heating pipe through two valve plugs on the valve with an included angle of 90 degrees. The tail gas pipe and the heating pipe are on the same side, and the included angle of the nozzles located inside the box body is 180 degrees. Therefore, when the two valves with an included angle of 90 degrees are in different positions, there is always a channel connected to the box body, enabling the gas to be discharged normally and improving the safety of the equipment. Description of the Drawings

[0018] Figure 1 is the overall structure schematic diagram of the heating structure using engine tail gas in the embodiment of the present invention; Figure 2 is the schematic diagram of the shunt box structure in the embodiment of the present invention; Figure 3 is the schematic diagram of the exhaust pipe structure in the embodiment of the present invention; Figure 4 is one of the schematic diagrams of the internal gas flow direction in the shunt box in the embodiment of the present invention; Figure 5 is the other schematic diagram of the internal gas flow direction in the shunt box in the embodiment of the present invention; Figure 6 is the schematic diagram of the movable support structure in the embodiment of the present invention; Figure 7 is one of the schematic diagrams of the valve structure in the embodiment of the present invention; Figure 8 is the other schematic diagram of the valve structure in the embodiment of the present invention; Figure 9 is the schematic diagram of the asphalt transporter structure in the embodiment of the present invention.

[0019] Description of the Reference Numerals: 1. Engine; 2. Air passage; 21. Exhaust port; 3. Diverting box; 31. Box body; 32. Heating pipe; 33. Tail gas pipe; 34. Exhaust pipe; 35. Movable support; 351. Straight rod; 352. Support rod; 353. Guide chute; 354. Ear plate; 36. Valve; 361. Valve plug; 362. Steering shaft; 363. Connecting rod; 364. Pulley; 37. Linear actuator; 38. Limit block; 4. Muffler; 5. Storage bin; 6. Feeding hopper; 7. First-stage conveyor belt; 8. Second-stage conveyor belt; 9. Third-stage conveyor belt. Detailed implementation manners

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention. The following description of at least one exemplary embodiment is actually illustrative only and in no way limits the present invention and its application or use.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more. In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations. Embodiment 1

[0022] As Figure 1 、 Figure 2As shown in the figure, this embodiment provides a heating structure using engine exhaust gas, which includes an air passage 2 provided on a storage bin 5 and a flow splitting box 3 connected to an exhaust pipe 34 of an engine 1. Heating pipes 32 and tail gas pipes 33 are provided on both sides of the flow splitting box 3. The other end of the heating pipe 32 is connected to one end of the air passage 2. The other end of the air passage 2 is provided with an exhaust port 21, and the tail end of the tail gas pipe 33 is communicated with the outside air.

[0023] The air passage 2 is arranged between the inner wall and the outer wall of the storage bin 5. When passing through the high-temperature gas generated by the engine 1, it heats or keeps warm the materials inside the storage bin 5.

[0024] The flow splitting box 3 includes a box body 31 and a reversing valve provided on the box body 31. The reversing valve is used to control the on-off of the heating pipe 32 and the box body 31 and the on-off of the tail gas pipe 33 and the box body 31.

[0025] The exhaust pipe 34 of the engine 1 is communicated with the box body 31. The gas discharged from the engine 1 enters the box body 31. Through the control of the reversing valve, the gas enters the air passage 2 from the heating pipe 32 and then is discharged from the exhaust port 21. The gas passes through the air passage 2 to heat or keep warm the materials in the storage bin 5. Or the gas is directly discharged from the tail gas pipe 33. One end of the exhaust pipe 34 connected to the box body 31 is a Venturi variable diameter pipe structure, which can reduce the back pressure of the gas discharged from the engine 1, make the gas entering the box body 31 warmer, and reduce the damage of the gas to the structure inside the box body 31.

[0026] As Figure 2 、 Figure 3 shown, the large diameter of the Venturi variable diameter pipe structure at the end of the exhaust pipe 34 is D, the small diameter is d, and the diameter change is D / d = β (β > 1), which can effectively solve the problem of large back pressure of the exhaust pipe with a long exhaust distance.

[0027] During the process of the reversing valve controlling the on-off of the heating pipe 32 and the tail gas pipe 33 and the box body 31, when the tail gas pipe 33 is not communicated with the box body 31, the heating pipe 32 is communicated with the box body 31. When the heating pipe 32 is not communicated with the box body 31, the tail gas pipe 33 is communicated with the box body 31. To avoid that when the reversing valve is damaged, one of the tail gas pipe 33 and the heating pipe 32 is communicated with the box body 31 to discharge the gas in the box body 31 and prevent the gas in the box body 31 from flowing back into the engine 1 and causing a safety accident.

[0028] The reversing valve includes a valve 36, on which there are two valve plugs 361 with an included angle of 90 degrees. The valve plugs 361 are located inside the box body 31. Since the heating pipe 32 and the tail gas pipe 33 are on the same side of the box body 31, the included angle between the pipe orifices of the heating pipe 32 and the tail gas pipe 33 inside the box body 31 is 180 degrees. When one of the valve plugs 361 seals the pipe orifice of the tail gas pipe 33, the other valve plug 361 with an included angle of 90 degrees does not seal the pipe orifice of the heating pipe 32. Ensure that regardless of the working state of the reversing valve, there is always a pipeline to discharge the gas entering the box body 31 from the exhaust pipe 34 of the engine 1, ensuring the safety of the equipment and avoiding safety accidents. Embodiment 2

[0029] The difference between this embodiment and Embodiment 1 is that: The reversing valve further includes a movable bracket 35 and a linear actuator 37. The movable bracket 35 is connected to the linear actuator 37 and is driven to perform linear motion. The movable bracket 35 is connected to the valve 36 to drive the valve 36 to perform rotational motion, thereby controlling the positions of the two valve plugs 361 on the valve 36.

[0030] As Figure 4 、 Figure 7 、 Figure 8 shown, the valve 36 further includes a steering shaft 362, a connecting rod 363, and a pulley 364. Connecting rods 363 are provided at both ends of the steering shaft 362, and pulleys 364 are provided at the ends of the two connecting rods 363. The pulleys 364 on the two connecting rods 363 are arranged face to face, and the valve plug 361 is provided on the steering shaft 362. The steering shaft 362 is arranged inside the box body 31 and is located between the heating pipe 32 and the tail gas pipe 33. The two ends of the steering shaft 362 extend from the upper and lower surfaces of the box body 31. The connecting rod 363 is arranged on the outer surface of the box body 31, and the pulley 364 on the connecting rod 363 is connected to the movable bracket 35. When the movable bracket 35 performs linear motion, it drives the connecting rod 363 to rotate around the end of the steering shaft 362. The connecting rod 363 is fixedly connected to the steering shaft 362, thereby realizing the rotation of the steering shaft 362 around its central axis and realizing the sealing of the pipe orifices of the tail gas pipe 33 and the heating pipe 32 inside the box body 31 by the two valve plugs 361 thereon.

[0031] As Figure 1 、 Figure 2 、 Figure 4 、 Figure 6 shown, the movable bracket 35 includes a straight rod 351, two support rods 352, and two guide chutes 353. As Figure 6The red arrow indicates that the movable bracket 35 moves in this direction through the linear actuator 37. Vertical support rods 352 are respectively arranged at both ends of the straight rod 351. Guide chutes 353 are respectively arranged at the other ends of the two support rods 352. An ear plate 354 is arranged in the middle of the straight rod 351, and the ear plate 354 is connected to the output shaft of the linear actuator 37. The straight rod 351 is located on the side of the box body 31 opposite to the connection of the exhaust pipe 34. The two support rods 352 on the straight rod 351 are respectively located on the upper and lower surfaces of the box body 31, and the guide chutes 353 on the support rods 352 are also located on the upper and lower surfaces of the box body 31. The guide chutes 353 are perpendicular to the side surface provided with the heating pipe 32 and the tail gas pipe 33. The pulley 364 on the connecting rod 363 cooperates with the guide chute 353.

[0032] The linear actuator 37 drives the movable bracket 35 to slide on the surface of the box body 31. Since the pulley 364 is in the guide chute 353, when the guide chute 353 moves on the upper and lower surfaces of the box body 31, it drives the connecting rods 363 on both sides to rotate around the end of the steering shaft 362. Since the steering shaft 362 is fixedly connected to the connecting rod 363, it drives the steering shaft 362 to rotate around the central axis, thereby driving the two valve plugs 361 on the steering shaft 362 to change positions to seal the pipe orifices of the tail gas pipe 33 and the heating pipe 32 located in the box body 31.

[0033] As Figure 8 shown, the connecting rod 363 is located between the two valve plugs 361, and the included angle with one of the valve plugs 361 is α. When the connecting rod 363 is pulled and rotated by the movable bracket 35, the connecting rod 363 is always located on the surface of the box body 31 to ensure stable use of the structure.

[0034] There are two valves 36, which are respectively located on both sides of the box body 31 provided with the heating pipe 32 and the tail gas pipe 33. Limit blocks 38 are also arranged on the upper and lower surfaces of the box body 31. Through holes are arranged on the limit blocks 38, and the support rods 352 on the movable bracket 35 are arranged through the through holes to limit the up and down movement of the support rods 352 and ensure the stability of the structure.

[0035] A silencer 4 is arranged on the exhaust pipe 34. The silencer 4 can reduce the sound of the exhaust gas discharged from the engine 1, thereby reducing the exhaust noise.

[0036] The storage bin 5 is funnel-shaped. The gas path channels 2 are located on both side surfaces at the bottom of the storage bin 5. The gas path channels 2 are two U-shaped channels. The two U-shaped channels form an open rectangular structure. One end of the two U-shaped channels is connected to one heating pipe 32, and the other end is provided with an exhaust port 21. The exhaust port 21 is located in the middle of the side plate of the storage bin 5. The gas entering the gas path channels 2 from the heating pipe 32 exchanges heat with the materials in the storage bin 5, thereby heating the materials. The exhaust port 21 is located in the middle of the storage bin 5, and the discharged gas has residual heat, which can act on the middle position at the bottom of the storage bin 5. The overall heat preservation or heating of the materials in the storage bin 5 is realized.

[0037] As Figure 2 , Figure 4 shown, the red arrow indicates the gas flow direction. The high-temperature gas generated by the engine 1 enters the shunt box 3 from the exhaust pipe 34. The valve 36 closes the nozzle of the tail gas pipe 33 located in the shunt box 3. The heating pipe 32 is communicated with the box body 31. After the high-temperature gas flows through the heating pipe 32, it enters the two U-shaped channels at the bottom of the storage bin 5. After passing through the U-shaped channels, the high-temperature gas is discharged from the exhaust port 21 at the other end, realizing the heating or heat preservation of the materials in the storage bin 5.

[0038] As Figure 5 shown, the red arrow indicates the gas flow direction. The valve plug 361 in the box body 31 seals the opening of the heating pipe 32, and the high-temperature gas generated by the engine 1 is directly discharged from the tail gas pipe 33.

[0039] The heating structure using the engine exhaust gas provided in this embodiment, through the control of the valve 36, one of the heating pipe 32 and the tail gas pipe 33 connected to the box body 31 is opened in any case to discharge the high-temperature gas of the engine 1. During the whole process of the movable bracket 35 driving the valve 36 to rotate, there is a channel to discharge the high-temperature gas. Ensure the safety of the equipment and avoid safety accidents. Embodiment 3

[0040] As Figure 9 shown, this embodiment provides an asphalt transfer vehicle based on Embodiment 2, including a receiving hopper 6, a storage bin 5, a primary conveyor belt 7, a secondary conveyor belt 8, and a tertiary conveyor belt 9. The receiving hopper 6 is used to receive the asphalt concrete materials from the transport vehicle and convey the materials into the storage bin 5 through the primary conveyor belt 7. The storage bin 5 has a buffering function and can accommodate a certain volume of asphalt concrete materials. And a heating structure using engine exhaust gas is provided at its bottom. During use, the heating structure using engine exhaust gas heats or keeps the materials in the storage bin 5 warm. The secondary conveyor belt 8 conveys the mixture to the tertiary conveyor belt 9 and finally conveys it to the paver.

[0041] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can still be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A heating structure using engine exhaust gas, characterized in that: include: An air passage arranged on the storage bin and a shunt box connected to the exhaust pipe of the engine, the shunt box is externally connected to a heating pipe and an exhaust pipe, the heating pipe is connected to the air passage, an exhaust port is arranged at the other end of the air passage, and the exhaust pipe is connected to the outside air; The diverter box includes a box body for installing the heating pipe and the tail gas pipe and a reversing valve for controlling the connection and disconnection between the heating pipe and the tail gas pipe and the box body; One end of the exhaust pipe connected to the box body is a reducer structure for reducing gas back pressure; When one of the heating pipe and the exhaust pipe is disconnected from the box, the other is connected to the box.

2. The heating structure using engine exhaust gas according to claim 1, characterized in that: The gas path channel includes two U-shaped channels, the two U-shaped channels form a disconnected rectangular structure, the head ends of the two U-shaped channels are respectively connected to the heating pipes on both sides of the box body, and exhaust pipes are provided on both sides of the box body.

3. The heating structure using engine exhaust gas according to claim 1, characterized in that: The reversing valve includes a linear driver, a movable bracket and a valve. The linear driver is used to drive the movable bracket to perform linear motion. The valve is connected to the movable bracket. The movable bracket drives the valve to move so as to control the on and off of the heating pipe and the exhaust pipe.

4. The heating structure using engine exhaust gas according to claim 3, characterized in that: The movable bracket comprises a straight rod and support rods located at both ends of the straight rod, the support rod is perpendicular to the straight rod, and the other end of the support rod is provided with a guide slide groove, and the guide slide groove is movably connected to the reversing valve.

5. The heating structure using engine exhaust gas according to claim 4, characterized in that: The support rods at both ends of the straight rod are respectively located on the upper and lower surfaces of the box body, the guide slide groove is also located on the surface of the box body, and limit blocks for limiting the up and down movement of the support rods are provided on the upper and lower surfaces of the box body.

6. The heating structure using engine exhaust gas according to claim 3, characterized in that: The valve includes the valve plug, a steering shaft and a connecting rod. Two valve plugs are provided on the steering shaft. The two valve plugs are respectively used to disconnect the connection between the heating pipe and the exhaust pipe and the box body. Both ends of the steering shaft are provided with vertically arranged connecting rods. The other end of the connecting rod is provided with a pulley. The pulleys on the two connecting rods are arranged face to face. The pulleys are arranged on the movable bracket. When the movable bracket makes a linear motion, the steering shaft makes a rotational motion, thereby driving the valve plug to open and close the heating pipe and the exhaust pipe.

7. The heating structure using engine exhaust gas according to claim 6, characterized in that: The angle between the two valve plugs is 90°. When the steering shaft rotates to where one of the valve plugs is located at the air inlet of the heating pipe or the exhaust pipe, the other valve plug is away from the air inlet of the exhaust pipe or the heating pipe, so that the gas can be discharged from one of the exhaust pipe or the heating pipe.

8. The heating structure using engine exhaust gas according to claim 6, characterized in that: The rotating shaft on the valve is installed on the inner side of the diverter box, and both ends of the rotating shaft extend from the upper and lower surfaces of the box body. The connecting rods at both ends are respectively located on the upper and lower surfaces of the box body, and the pulley on the connecting rod cooperates with the movable bracket.

9. The heating structure using engine exhaust gas according to claim 1, characterized in that: A muffler is arranged on the exhaust pipe.

10. An asphalt transport vehicle, characterized in that: It comprises a heating structure utilizing engine exhaust gas as described in any one of claims 1-9.

Images