A paver hopper exhaust heating device

Abstract

The application provides a paver hopper tail gas heating device and relates to the technical field of pavers, which solves the technical problem of the fast natural heat dissipation speed of the mixture at the exposed surface area of the paver hopper included angle region in the prior art. The device is a paver hopper tail gas heating device, which comprises left and right hoppers hinged to a paver, the left and right hoppers form a hopper included angle, a driving mechanism is used for driving the left and right hoppers to turn towards or away from each other around the respective hinged shafts, a heating box is formed with a heating cavity inside, the heating box is provided with an air inlet hole and an air outlet hole, an exhaust pipe is used for connecting the tail gas pipe of the paver engine at one end and is arranged on the paver at the other end, and the two heating boxes are respectively attached and fixed to the outer walls on both sides of the hopper included angle, so that the high temperature loss area is targeted and close-attached heated, and the heat is directly conducted to the mixture to quickly offset the regional temperature loss.

Description

Technical Field

[0001] This invention relates to the field of paver technology, and in particular to a paver hopper exhaust gas heating device. Background Technology

[0002] In road engineering, especially in the construction of high-grade highways, the paving quality of modified asphalt mixtures directly determines the smoothness, compaction, and ultimate service life of the pavement. Because modified asphalt is extremely sensitive to temperature, its paving operation must strictly control the mixture temperature within the standard range of 160-180℃. If the temperature deviates from this range, serious engineering quality problems will arise: too low a temperature will lead to increased mixture viscosity, difficulty in compaction, and consequently segregation and excessive porosity; too high a temperature will easily cause asphalt aging, reducing pavement durability.

[0003] During actual paving construction, the area at the corner of the paver hopper (i.e., where the side flanges of the receiving hopper meet the bottom plate) is a high-risk area for temperature segregation and a weak point in temperature control. Due to its unique geometry, this area has a large exposed surface area and strong air convection, causing the natural heat dissipation rate of the mixture here to be much faster than in the center of the hopper. If not intervened in time, the temperature of the mixture at the corner will rapidly drop below the standard range, causing localized cold material segregation and severely affecting the uniformity of the paved layer.

[0004] Therefore, developing a modified asphalt paver hopper angle temperature control device that can achieve rapid response, precise temperature control, and efficient heat dissipation has become an urgent technical challenge in the field of road construction equipment. Summary of the Invention

[0005] The purpose of this invention is to provide a paver hopper exhaust gas heating device to solve the technical problem in the prior art where the natural heat dissipation rate of the mixture is rapid in the paver hopper angle area due to its special geometry, large exposed surface area, and strong air convection. The various technical effects of the preferred solutions provided by this invention are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A paver hopper exhaust gas heating device includes: The left and right hoppers are hinged to the paver, and the left and right hoppers form an included angle. The drive mechanism is connected to the left and right hoppers and is used to drive the left and right hoppers to rotate towards or away from each other around their respective hinge axes. The heating box consists of two parts, which are respectively attached and fixed to the outer walls of the two sides of the included angle of the hopper. The heating box forms a heating chamber inside and has an air inlet and an air outlet. The exhaust pipe has one end connected to the exhaust pipe of the paver engine and the other end located on the paver. The end of the exhaust pipe away from the engine exhaust pipe has a first state connected to the air inlet of the heating box and a second state disconnected from the air inlet of the heating box. The heating box switches between connected and disconnected states with the end of the exhaust pipe as the hopper rotates.

[0007] Furthermore, a heating tube is installed inside the heating chamber of the heating box. The heating tube is arranged in an S-shaped multi-segment spiral. One end of the heating tube is connected to the air inlet, and the other end of the heating tube is connected to the exhaust port.

[0008] Furthermore, the heating tube has multiple heat dissipation holes on its wall, which connect the interior of the heating tube to the heating chamber of the heating box. The multiple heat dissipation holes are evenly spaced along the length of the heating tube.

[0009] Furthermore, multiple heating fins are fixedly installed on the heating tube, and the multiple heating fins are evenly spaced along the length of the heating tube, and the heating fins are in contact with the tube wall of the heating tube.

[0010] Furthermore, the heating fins are inclinedly arranged on the side wall of the heating tube with the length direction of the heating tube as the axis, and each heating fin is correspondingly arranged with one heat dissipation hole. The opening direction of the heat dissipation hole is parallel to the inclination direction of the corresponding heating fin, so that the flue gas discharged from the heat dissipation hole flows along the surface of the heating fin.

[0011] Furthermore, an inner tube is fixedly installed at one end of the exhaust pipe near the heating box. When the exhaust pipe is in the first state, the inner tube is inserted into the heating pipe to achieve communication between the exhaust pipe and the heating pipe. An exhaust gap is reserved at the end of the heating pipe connected to the air inlet. The exhaust gap is connected to the heating chamber and is used for exhausting the exhaust gas in the heating chamber after heat dissipation.

[0012] Furthermore, the heating fins are annular and sleeved on the heating tube, and the heating fins have a trumpet-shaped structure and extend along the length of the heating tube.

[0013] Furthermore, a heat insulation layer is laid on the inner wall of the heating box, and the heat insulation layer covers the inner wall surface of the heating box.

[0014] Furthermore, the heating box has a V-shaped plate structure, and the inner sides of the two heating boxes are respectively attached and fixed to the outer walls of the hopper on both sides of the included angle of the hopper.

[0015] Furthermore, it also includes electromagnetic reversing valves, temperature sensors, and PLC controllers; The electromagnetic reversing valve is connected in series on the exhaust pipe of the paver engine. The end of the exhaust pipe away from the heating box is connected to the electromagnetic reversing valve. The electromagnetic reversing valve is used to drive the exhaust pipe to switch to a first state that is connected to the air inlet of the heating box or a second state that is disconnected. The temperature sensor is installed inside the heating chamber of the heating box to detect the temperature inside the heating chamber in real time and output a temperature detection signal. The PLC controller is installed on the paver and is electrically connected to the solenoid valve and the temperature sensor respectively. The PLC controller receives the temperature detection signal and controls the opening and closing of the solenoid valve according to the signal to realize the connection or disconnection between the engine exhaust pipe and the air inlet of the heating box.

[0016] The paver hopper exhaust gas heating device of this invention effectively solves the technical problem of rapid natural heat dissipation of the mixture due to the special geometry, large exposed surface area, and strong air convection in the corner area of ​​the paver hopper. It achieves stable maintenance of the modified asphalt mixture at the standard paving temperature of 160-180℃. The device attaches two heating boxes to the outer walls of both sides of the hopper corner, providing targeted, close-range heating to areas prone to temperature loss. Heat is directly transferred to the mixture, quickly offsetting regional temperature loss and preventing localized segregation of cold material from the source. Utilizing engine exhaust gas as a heat source eliminates the need for additional heating equipment, achieving resource utilization of waste heat. The heating response is rapid and energy-saving. Simultaneously, the heating boxes can adaptively switch on and off with the hopper's rotation and exhaust pipe, adapting to the depth of hopper opening and closing. Heating automatically stops when not in operation, avoiding energy waste and overheating of the equipment. Furthermore, the device is assembled solely through attachment and piping connections, without altering the paver's core structure, making it highly adaptable and easy to retrofit and install. This design significantly improves heat conduction and temperature compensation efficiency, effectively preventing problems such as compaction difficulties and segregation caused by the mixture temperature being lower than the standard range, ensuring the uniformity of the paving layer and construction quality, and meeting the stringent temperature control requirements for modified asphalt paving of high-grade highways. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present invention; Figure 2 These are partial structural schematic diagrams provided in embodiments of the present invention; Figure 3 This is a partial isometric schematic diagram of the structure provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the heating box structure provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of the heating box provided in an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached drawings: 100, hopper; 110, drive mechanism; 200, exhaust pipe; 210, inner tube; 300, heating box; 310, air inlet; 320, exhaust gap; 330, air outlet; 340, heating tube; 350, heating fins; 360, heat dissipation hole; 370, temperature sensor; 400, electromagnetic reversing valve. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0021] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0024] Example 1 Reference Figure 1 and Figure 2As shown in the figure, this embodiment discloses a paver hopper exhaust gas heating device. The device is adapted to the working structure at the front end of the paver and includes a hopper 100, a drive mechanism 110, a heating box 300, an exhaust pipe 200, and a matching intelligent temperature control component. The components work together to achieve targeted heating, adaptive on / off switching, and precise temperature control in the hopper 100 angle area. This effectively solves the technical problem of excessive heat dissipation in the hopper 100 angle area and ensures that the modified asphalt mixture is always within the standard paving temperature range of 160-180℃.

[0025] The hopper 100 is divided into a left hopper 100 and a right hopper 100, both of which are hinged and installed at the front end of the paver. The left hopper 100 and the right hopper 100 are symmetrical C-shaped structures with an included angle. They can rotate towards or away from each other under the drive of the drive mechanism 110. When they rotate away from each other to a preset position, they can form the included angle of the hopper 100 required for the paver's operation. This C-shaped structure is adapted to the working form of the hopper 100 and can accurately enclose the load-bearing area of ​​the mixture. At the same time, it provides a matching geometric basis for the subsequent bonding installation of the heating box 300, ensuring that the heating box 300 can achieve full-coverage bonding heating of the included angle of the hopper 100, a high-risk area for temperature segregation.

[0026] Reference Figure 2 and Figure 3 As shown, the drive mechanism 110 is a hydraulic drive cylinder. This hydraulic drive cylinder is installed at the front end of the paver, corresponding to the number and position of the hoppers 100. One end of the cylinder body is fixedly installed on the front side wall of the paver facing the hoppers 100, and one end of the piston rod is fixedly connected to the outer side wall of the hoppers 100 facing the front end of the paver. Relying on the stable power output of the hydraulic drive, the left hopper 100 and the right hopper 100 can be precisely driven to complete the flipping action around their respective hinge axes, realizing the smooth and controllable switching of the opening and closing state of the hoppers 100. This provides reliable action support for the adaptive linkage between the heating device and the working conditions of the hoppers 100, ensuring the accuracy and stability of the subsequent switching of the heating on and off states.

[0027] There are two heating boxes 300, and their structures match the outer walls of the hopper 100. Both are C-shaped structures with included angles. The two heating boxes 300 are respectively fixed to the outer walls of the included angle of the hopper 100 on both sides. The inner walls of the heating boxes 300 are tightly fitted to the outer walls of the included angle of the hopper 100. This conformal fitting design can maximize the contact area between the heating boxes 300 and the hopper 100, greatly improve the heat conduction efficiency from the heating boxes 300 to the mixture inside the hopper 100, reduce the ineffective heat loss during the transfer process, and allow the heating heat to act directly and quickly on the mixture inside the included angle of the hopper 100 to achieve targeted heat supplementation.

[0028] The heating chamber 300 has an independent sealed heating cavity inside, providing space for exhaust gas heat exchange. The heating chamber 300 is also provided with an air inlet 310 and an air outlet 330. The air inlet 310 is located on the side of the heating chamber 300 facing the bottom during use, and the air outlet 330 is located on the side of the heating chamber 300 facing the top during use. The air inlet 310 and the air outlet 330 are staggered vertically, so that the engine exhaust gas can form a smooth flow path in the vertical direction after entering the heating chamber, prolonging the residence time of the exhaust gas in the heating chamber, improving the heat exchange between the exhaust gas and the wall of the heating chamber 300, and further improving the heating efficiency.

[0029] Two exhaust pipes 200 and two heating boxes 300 are installed symmetrically at the front end of the paver. The exhaust pipe 200 consists of a main air pipe and two branch air pipes. One end of the main air pipe is connected to the exhaust pipe of the paver engine to achieve centralized collection of engine exhaust gas. One end of each of the two branch air pipes is connected to the other end of the main air pipe. The two branch air pipes extend symmetrically to the bottom of the front end of the paver. The other end is fixedly installed at a preset position at the bottom of the front end of the paver. The air outlet at this end corresponds to the air inlet 310 of the heating box 300 at a preset position when the hopper 100 is opened and closed. This split pipeline structure can realize the directional diversion and precise delivery of engine exhaust gas, so that the exhaust gas can be introduced into the two heating boxes 300 synchronously and evenly, realizing synchronous heating on both sides of the angle of the hopper 100. This avoids uneven temperature in the angle area of ​​the hopper 100 caused by unilateral heating and ensures the uniformity of heating from the structure.

[0030] This device relies on the tilting action of the hopper 100 to achieve mechanical adaptive switching of the heating state. When heating is required for paving operations, the drive mechanism 110 drives the left and right hoppers 100 to spread out in opposite directions. The hoppers 100 drive the heating box 300 to move synchronously, so that the air inlet 310 on the heating box 300 is precisely aligned and connected with the end of the branch pipe of the exhaust pipe 200, forming the first state of exhaust gas delivery. At this time, the high-temperature exhaust gas generated by the engine can be smoothly delivered to the heating chamber of the heating box 300 through the main air pipe and the branch pipe. After the high-temperature exhaust gas fully exchanges heat with the wall of the heating box 300, the heat is conducted through the wall of the hopper 100 to the mixture in the angle of the hopper 100, realizing rapid heat replenishment and timely offsetting the natural heat dissipation caused by the large exposed area and strong air convection in the angle area of ​​the hopper 100, preventing the temperature of the mixture from dropping rapidly.

[0031] When heating is not required or when the hopper 100 is used for feeding, the drive mechanism 110 drives the left and right hoppers 100 to flip in opposite directions. The hoppers 100 drive the heating box 300 to move synchronously, causing the air inlet 310 of the heating box 300 to disconnect from the branch pipe, forming a second state where the exhaust gas delivery is disconnected. At this time, the air inlet 310 and the air outlet 330 of the heating box 300 form a transparent connection. The residual heat in the heating chamber can be quickly exchanged with the outside air through the air inlet 310 and the air outlet 330, realizing rapid heat dissipation of the heating box 300. This avoids the accumulation of residual heat in the heating box 300, which would cause the temperature in the angled area of ​​the hopper 100 to exceed the standard. At the same time, it adapts to the heat dissipation needs of non-heating conditions such as feeding the hopper 100. The heating state can be switched without manual intervention, which avoids energy waste and prevents the equipment from overheating due to dry burning.

[0032] This device is also equipped with an intelligent temperature control component to achieve precise electronic control and regulation of the heating process. The intelligent temperature control component includes a PLC controller, an electromagnetic reversing valve 400, and a temperature sensor 370. The PLC controller is fixedly installed in the control area of ​​the paver, and the PLC controller has a preset temperature range of 160-180℃ that matches the paving standard of modified asphalt mixture, providing a basis for temperature control.

[0033] The electromagnetic reversing valve 400 is a three-way structure device installed at the connection position between the main air pipe and the engine exhaust pipe. The three ports of the electromagnetic reversing valve 400 are respectively connected to the engine exhaust pipe, the main air pipe, and the conventional exhaust pipe of the paver, which can realize the switching between two connection states, namely connecting the engine exhaust pipe and the main air pipe, or connecting the engine exhaust pipe and the conventional exhaust pipe of the paver; the temperature sensor 370 is a contact temperature measuring element, which is fixedly installed inside the heating chamber of the heating box 300. It can detect the heat exchange temperature in the heating chamber in real time and accurately feed back the actual heating temperature in the angle area of ​​the hopper 100.

[0034] Temperature sensor 370 and electromagnetic reversing valve 400 are both electrically connected to PLC controller via wiring, forming a complete temperature closed-loop control system. The working principle is as follows: Temperature sensor 370 converts the real-time detected temperature of the heating chamber into an electrical signal and transmits it to PLC controller in real time. PLC controller analyzes and judges the received temperature detection signal in real time. When the detected temperature is lower than the preset lower limit of 160℃, PLC controller issues a control command to control electromagnetic reversing valve 400 to switch to the state of connecting engine exhaust pipe and main exhaust pipe. Engine exhaust gas smoothly enters exhaust pipe 200 and is delivered to heating box 300 for heating.

[0035] When the detected temperature reaches the preset upper limit of 180℃, the PLC controller issues a control command to switch the electromagnetic reversing valve 400 to a state where the engine exhaust pipe is connected to the paver's conventional exhaust pipe, cutting off the exhaust gas passage to the heating device and stopping the heating operation. Through the precise regulation of this intelligent temperature control component, the automatic opening and closing of the engine exhaust pipe and the air inlet 310 of the heating box 300 is achieved, ensuring that the temperature in the hopper 100 angle area remains stable within the standard paving range of 160-180℃. This effectively avoids problems such as compaction difficulties and segregation of the mixture due to excessively low temperature, or asphalt aging due to excessively high temperature, ensuring temperature control accuracy and paving construction quality from both hardware and electrical control perspectives.

[0036] Example 2 Further structural limitations of the heating chamber 300 in Example 1.

[0037] The heating chamber 300 has a V-shaped plate structure. During use, the openings of the two V-shaped heating chambers 300 are positioned opposite each other, and their inner V-shaped sidewalls are tightly fitted and fixed to the outer walls of the hopper 100 on both sides of the included angle. This fitted structure maximizes the contact area with the hopper 100, allowing heat to be directly conducted to the inside of the included angle of the hopper 100, thus improving heat transfer efficiency. The inner wall surface of the heating chamber 300 is entirely covered with a heat insulation layer, which completely covers the inner wall surface of the heating chamber 300. This effectively reduces heat loss from the heating chamber 300 to the outside, improves the overall heat insulation effect of the heating chamber 300, and ensures that the heat in the heating chamber is concentrated on the wall of the hopper 100, further improving heating utilization.

[0038] Heating tubes 340 are fixedly installed inside the heating chamber 300. The heating tubes 340 are arranged in an S-shaped, multi-segment spiral pattern within the heating cavity. This arrangement significantly increases the length of the heating tubes 340 within the heating cavity, extending the flow path and residence time of the exhaust gas within the heating tubes 340, and improving the heat exchange efficiency between the exhaust gas and the heating tubes 340. One end of the heating tube 340 is connected to the exhaust port of the heating chamber 300, serving as the main exhaust channel. The other end of the heating tube 340 extends to the air inlet 310 of the heating chamber 300, forming an end structure. An exhaust gap 320 is reserved between this end and the side wall of the air inlet 310, and the exhaust gap 320 is connected to the heating cavity of the heating chamber 300, providing an auxiliary exhaust path for the exhaust gas within the heating cavity.

[0039] The branch pipe of the exhaust pipe 200 is connected to one end of the heating box 300 and is fixedly installed with an inner pipe 210. When it is necessary to connect the branch pipe and the heating pipe 340 for heating, the inner pipe 210 can be precisely inserted into the end of the heating pipe 340 located at the air inlet 310 to achieve a sealed connection between the two. At the same time, the end of the branch pipe will be inserted into the air inlet 310 to block the heating chamber and prevent the heat in the heating chamber from being lost from the air inlet 310, thus ensuring the sealed heat exchange effect of the heating chamber.

[0040] Multiple heating fins 350 are fixedly installed on the wall of the heating tube 340. These fins are evenly spaced along the length of the heating tube 340 and are tightly fitted to the tube wall, enabling rapid heat transfer from the heating tube 340 to the fin surface. The heating fins 350 are generally annular and fitted onto the heating tube 340. The fins have a funnel-shaped structure and extend obliquely along the length of the heating tube 340. This structure significantly increases the effective heat exchange area of ​​the heating chamber, allowing the air inside the heating chamber to fully contact the fins and improving overall heat exchange efficiency.

[0041] Multiple heat dissipation holes 360 are also provided on the wall of the heating tube 340. The heat dissipation holes 360 penetrate the wall of the heating tube 340, enabling communication between the interior of the heating tube 340 and the heating chamber of the heating box 300. During use, the high-temperature exhaust gas inside the heating tube 340 can be discharged into the heating chamber through the heat dissipation holes 360, allowing the high-temperature exhaust gas to fill the entire heating chamber. This ensures that both the inner wall of the heating box 300 and the heating chamber are fully heated, further increasing the overall heating area of ​​the heating box 300. The diameter of the heat dissipation holes 360 is strictly controlled, being less than one-tenth the diameter of the heating tube 340. This ensures that the high-temperature exhaust gas can be discharged smoothly from the heat dissipation holes 360, while preventing the exhaust gas from flowing too fast and the pressure from dropping suddenly due to an excessively large hole diameter, thus ensuring the normal flow of the hot exhaust gas within the heating tube 340.

[0042] Each heat dissipation hole 360 ​​is correspondingly set to one heating fin 350, and the opening direction of the heat dissipation hole 360 ​​is parallel to the tilt direction of the corresponding heating fin 350. This allows the high-temperature flue gas discharged from the heat dissipation hole 360 ​​to flow smoothly along the tilted surface of the heating fin 350, enabling the flue gas to achieve sufficient contact and heat exchange with the heating fin 350. During the exhaust gas heat dissipation process, the exhaust gas in the heating tube 340 forms a dual-path exhaust structure: part of the exhaust gas is discharged directly from the exhaust hole along the inside of the heating tube 340; the other part of the exhaust gas is discharged to the heating chamber through the heat dissipation hole 360 ​​and flows to the surface of the heating fin 350. After completing the heat exchange with the fin, it is discharged from the exhaust gap 320 between the end of the heating tube 340 and the air inlet 310. During the discharge process, the heat on the heating fin 350 can be carried away simultaneously, which not only ensures sufficient heat exchange, but also enables the rapid discharge of residual heat in the heating chamber, avoiding the accumulation of heat in the heating chamber.

[0043] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A paver hopper exhaust gas heating device, characterized in that, include: The left hopper (100) and right hopper (100) are hinged to the paver, and the left hopper (100) and right hopper (100) form an angle between the hoppers (100); The drive mechanism (110) is connected to the left hopper (100) and the right hopper (100) for driving the left hopper (100) and the right hopper (100) to rotate towards or away from each other around their respective hinge axes; The heating box (300) consists of two parts, which are respectively attached and fixed to the outer walls of the two sides of the included angle of the hopper (100). The heating box (300) forms a heating chamber inside. The heating box (300) is provided with an air inlet (310) and an exhaust port. The exhaust pipe (200) has one end connected to the exhaust pipe of the paver engine and the other end located on the paver. The end of the exhaust pipe (200) away from the engine exhaust pipe has a first state connected to the air inlet (310) of the heating box (300) and a second state disconnected from the air inlet (310) of the heating box (300). The heating box (300) switches between connected and disconnected states with the end of the exhaust pipe (200) as the hopper (100) flips.

2. The paver hopper exhaust gas heating device according to claim 1, characterized in that, The heating chamber of the heating box (300) is equipped with a heating tube (340), which is arranged in an S-shaped multi-segment spiral. One end of the heating tube (340) is connected to the air inlet (310), and the other end of the heating tube (340) is connected to the exhaust port.

3. The paver hopper exhaust gas heating device according to claim 2, characterized in that, The heating tube (340) has multiple heat dissipation holes (360) on its tube wall. The heat dissipation holes (360) connect the interior of the heating tube (340) with the heating chamber of the heating box (300). The multiple heat dissipation holes (360) are evenly spaced along the length of the heating tube (340).

4. The paver hopper exhaust gas heating device according to claim 3, characterized in that, Multiple heating fins (350) are fixedly installed on the heating tube (340). The multiple heating fins (350) are evenly spaced along the length of the heating tube (340), and the heating fins (350) are in contact with the tube wall of the heating tube (340).

5. The paver hopper exhaust gas heating device according to claim 4, characterized in that, The heating fins (350) are inclined on the side wall of the heating tube (340) with the length direction of the heating tube (340) as the axis. Each heating fin (350) is correspondingly provided with a heat dissipation hole (360). The opening direction of the heat dissipation hole (360) is parallel to the inclination direction of the corresponding heating fin (350), so that the flue gas discharged from the heat dissipation hole (360) flows along the surface of the heating fin (350).

6. The paver hopper exhaust gas heating device according to claim 4, characterized in that, An inner tube (210) is fixedly installed at one end of the exhaust pipe (200) near the heating box (300). When the exhaust pipe (200) is in the first state, the inner tube (210) is inserted into the heating tube (340) and the exhaust pipe (200) and the heating tube (340) are connected. An exhaust gap (320) is reserved at the end of the heating tube (340) connected to the air inlet (310). The exhaust gap (320) is connected to the heating chamber and is used for exhausting the exhaust gas in the heating chamber after heat dissipation.

7. The paver hopper exhaust gas heating device according to claim 5, characterized in that, The heating fins (350) are annular and sleeved on the heating tube (340). The heating fins (350) have a funnel-shaped structure and extend along the length of the heating tube (340).

8. The paver hopper exhaust gas heating device according to claim 1, characterized in that, The inner wall of the heating box (300) is covered with a heat insulation layer, which covers the inner side wall of the heating box (300).

9. The paver hopper exhaust gas heating device according to claim 1, characterized in that, The heating box (300) has a V-shaped plate structure, and the inner sides of the two heating boxes (300) are respectively attached and fixed to the outer walls of the hopper (100) on both sides of the included angle.

10. The paver hopper exhaust gas heating device according to claim 1, characterized in that, It also includes a solenoid directional valve (400), a temperature sensor (370), and a PLC controller; The electromagnetic reversing valve (400) is connected in series on the exhaust pipe of the paver engine. The end of the exhaust pipe (200) away from the heating box (300) is connected to the electromagnetic reversing valve (400). The electromagnetic reversing valve (400) is used to drive the exhaust pipe (200) to switch to a first state connected to the air inlet (310) of the heating box (300) or a second state disconnected. The temperature sensor (370) is installed in the heating chamber of the heating box (300) to detect the temperature in the heating chamber in real time and output a temperature detection signal; the PLC controller is installed on the paver and is electrically connected to the electromagnetic reversing valve (400) and the temperature sensor (370) respectively. The PLC controller receives the temperature detection signal and controls the opening and closing of the electromagnetic reversing valve (400) according to the signal to realize the connection or disconnection between the engine exhaust pipe and the air inlet (310) of the heating box (300).

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