Exhaust system of mining dump truck with rigid frame

Abstract

The utility model discloses an exhaust system of a mining dump truck with a rigid frame, which comprises an air inlet pipe component, a transition pipe component and an air outlet pipe component, two ends of the transition pipe component are hermetically connected with the frame, one end of the air inlet pipe component is connected with an engine, and the other end of the air inlet pipe component is communicated with the bottom of one end of the transition pipe component. The air inlet end of the air outlet pipe assembly is communicated with the other end of the transition pipe assembly away from the air inlet pipe assembly. The transition pipe assembly is installed on the frame in a sealed mode, and the air inlet pipe assembly and the air outlet pipe assembly are communicated with the transition pipe assembly, so that the transition pipe assembly serves as a part of an exhaust system and also serves as a part of the frame, the space for arrangement of high-voltage wires can be emptied, and arrangement of high-voltage wire harnesses and other electrical components is facilitated; and meanwhile, heat source invasion caused by the exhaust pipe can be avoided, the preparation process is simple, only the trend of the air inlet pipe assembly in the cabin needs to be considered during arrangement, the structure is simple, the layout is regular, and the heat dissipation performance is good.

Description

Technical Field

[0001] The utility model relates to an exhaust system of a rigid frame mining dump truck, belonging to the technical field of mining dump trucks. Background Art

[0002] Rigid-frame mining dump trucks are a key component of mining machinery and are widely used both domestically and internationally. Within this product category, smaller-displacement engines typically utilize a single exhaust pipe, while larger-displacement engines often employ two or more exhaust pipes. Larger equipment, such as those with a payload capacity of 150 tons or more, typically utilize engines with a capacity of 30L or more, often employing dual superchargers and dual exhaust manifolds. In addition, there is a power route in the form of multiple engines and multiple power units, and most of these types of equipment are electric transmission or extended-range type, and high-voltage wiring harnesses need to be arranged inside and outside the cabin, which has a great impact on the exhaust pipe layout of the entire vehicle exhaust system. If the exhaust pipe and the high-voltage wiring harness are arranged crosswise, the high-temperature exhaust pipe will generate heat source intrusion on the high-voltage wire, causing it to be burned or even fail due to high temperature. Secondly, although a layer of thermal insulation material can be wrapped around the exhaust pipe to isolate most of the high temperature, the thermal insulation material is easy to fall off and age, and the exhaust pipe is complicated in the cabin. Maintenance personnel need to spend a lot of time to check for aging during maintenance, and because the distribution of the exhaust pipe lacks regularity and the layout is relatively messy, the temperature of the exhaust pipe cannot dissipate immediately after the vehicle is turned off. Maintenance personnel need to wait for it to cool down before they can operate, which reduces work efficiency; and the complicated exhaust pipe not only occupies a large space, which is not conducive to the layout of the high-voltage wiring harness, but also affects the aesthetics and maintenance convenience.

[0003] Patent publication number CN210889084U discloses a hollow rectangular beam with two pipe holes in the front sidewall and an outlet hole in the rear sidewall. An internal exhaust duct is installed within the rear beam, with the outlet of the internal exhaust duct passing through the outlet holes and connected to a flue port fixed to the vehicle body. The end of the external exhaust duct passes through the pipe hole and connects to the air inlet of the internal exhaust duct. However, this requires modifying the rear beam structure to accommodate the internal exhaust duct structure, and the assembly and manufacturing process of the two are relatively difficult. Furthermore, the design is not suitable for the layout of multiple exhaust pipes and wiring harnesses, which is limited and cannot be easily assembled on site. Summary of the Invention

[0004] Purpose of the invention: In order to solve the above technical problems, the utility model provides an exhaust system for a rigid frame mining dump truck. By setting a rectangular transition pipe, it is not only a part of the exhaust system, but also a part of the frame, which saves space in the cabin and facilitates wiring harness arrangement.

[0005] Technical solution: An exhaust system for a rigid-frame mining dump truck, comprising an intake pipe assembly, a transition pipe assembly, and an outlet pipe assembly. Both ends of the transition pipe assembly are sealed with the frame, one end of the intake pipe assembly is connected to the engine, and the other end is connected to the bottom of one end of the transition pipe assembly, and the air inlet end of the outlet pipe assembly is connected to the upper part of the other end of the transition pipe assembly away from the intake pipe assembly.

[0006] The present invention installs a transition pipe assembly on the vehicle frame and simultaneously connects the intake pipe assembly and the outlet pipe assembly to the transition pipe assembly, so that the transition pipe assembly not only serves as a part of the exhaust system but also becomes a part of the vehicle frame. Without destroying the original structure of the vehicle frame, exhaust can be achieved by simply installing the exhaust pipes at both ends. This not only frees up space for high-voltage wires and facilitates the arrangement of high-voltage wiring harnesses and other electrical components, but also avoids heat source interference caused by exhaust. The preparation process is simple, and when arranging, only the direction of the intake pipe assembly in the cabin needs to be considered. The structure is simple and the layout is regular, with good heat dissipation and lighter weight. The exhaust gas flow path is: engine-intake pipe assembly-transition pipe assembly-outlet pipe assembly-cargo box heating structure or muffler structure.

[0007] Preferably, in order to realize the exhaust layout of a single set of exhaust pipes, the transition pipe assembly includes a straight pipe with both ends sealedly connected to the frame respectively, and the intake pipe assembly and the outlet pipe assembly respectively include a first intake pipe and a first outlet pipe, one end of the first intake pipe is connected to the engine, and the other end is connected to the bottom of one end of the straight pipe, and the air inlet end of the first outlet pipe is connected to the upper part of the other end of the straight pipe.

[0008] Preferably, in order to achieve a dual exhaust pipe exhaust layout, the transition pipe assembly further includes a closed L-shaped pipe with a hollow interior, and the intake pipe assembly and the outlet pipe assembly further include a second intake pipe and a second outlet pipe respectively configured to match the L-shaped pipe. The longitudinal end faces of the L-shaped pipe are respectively sealed to the vehicle frame, and the L-shaped inner sidewall of the L-shaped pipe is sealed and spliced with the adjacent two outer sidewalls of the straight pipe. One longitudinal end of the straight pipe is sealed to the vehicle frame via the L-shaped pipe, and the other end is sealed to the frame. The second intake pipe is connected to the bottom of one end of the L-shaped pipe, and the second outlet pipe is connected to the top of the other end of the L-shaped pipe. The L-shaped pipe sealed to the straight pipe is provided to make it more consistent with the vehicle frame structure, facilitate welding to the frame, and save space.

[0009] Preferably, in order to arrange the positions of the air outlet pipes, the connecting hole between the second air outlet pipe and the L-shaped pipe and the connecting hole between the first air outlet pipe and the straight pipe are both located on the same longitudinal axis of the straight pipe.

[0010] Since the outlet end of the air outlet pipe can be used to connect with the cargo box for heating the cargo box, the connecting holes of the air outlet pipe are all arranged along the longitudinal axis direction of the straight pipe, so that the air outlet pipe can be arranged on the frame away from both the cab side and the cargo box side, avoiding interference with the cargo box due to insufficient space when arranging the air outlet pipe. At the same time, the air outlet pipe arranged away from the cab side can avoid the impact of high temperature and noise on the driver, thereby improving driving comfort.

[0011] Preferably, to facilitate connection of the intake ducts, the connecting holes between the first intake duct and the straight duct, and the connecting holes between the second intake duct and the L-shaped duct, are arranged in a staggered manner along the transverse direction. This staggered arrangement avoids lengthy detours of the intake duct to avoid interference with interior vehicle components, thus reducing space utilization and impacting high-voltage wiring layout.

[0012] Preferably, in order to realize the installation of multiple exhaust pipes, at least one group of the matching L-shaped pipe, the second air inlet pipe and the second air outlet pipe is provided, and the L-shaped inner side walls of adjacent L-shaped pipes are sealed with the L-shaped outer side walls.

[0013] A corresponding number of L-shaped pipes are set for exhaust according to the number of exhaust pipes, ensuring that the overall structure of the transition pipe is easy to weld to the frame and reducing the difficulty of installation.

[0014] Preferably, in order to facilitate the processing of the L-shaped tube so that it can be quickly processed on site, the L-shaped tube includes a transverse portion and a longitudinal portion, the transverse portion is a bent structure, and the longitudinal portion is a straight tube structure, the transverse portion is sealed with the longitudinal portion and the straight tube respectively, and a through hole is provided between the transverse portion and the longitudinal portion, the second air outlet pipe is connected to the upper end face of the transverse portion, and the second air inlet pipe is connected to the bottom face of one end of the longitudinal portion away from the transverse portion.

[0015] Simply align one end of two straight pipes of different lengths, or align straight pipes of the same length, and weld their side ends together. Then, weld a bent plate separately at the gap or flush point. A through-hole is created between the bent plate and the longer straight pipe or one of the two equal straight pipes to create an L-shaped pipe for the other exhaust pipe. This eliminates the need to separately fabricate a complete L-shaped pipe; instead, the bent plate can be welded directly on-site. This simplifies fabrication, accommodates straight pipes of varying sizes, and reduces costs. Exhaust gas enters the longitudinal section through the second intake pipe, passes through the through-hole, reaches the transverse section, and finally exits the second exhaust pipe.

[0016] Preferably, the transition tube assembly is a rectangular tube. To facilitate connection with the vehicle frame, the rectangular tube structure only needs to be sealed with different types of vehicle frames to achieve installation and sealing, simplifying installation, improving work efficiency, improving sealing, and simplifying the process.

[0017] Preferably, in order to prevent the exhaust pipe from being damaged due to mutual vibration between the rigidly connected exhaust pipe and other components, the first air inlet pipe, the first air outlet pipe, the second air inlet pipe and the second air outlet pipe are all provided with bellows.

[0018] Preferably, to ensure sealing, the first air inlet pipe, the first air outlet pipe, the second air inlet pipe, the second air outlet pipe, and the transition duct assembly are each connected via flanges, with a deformable metal gasket disposed between the flanges and the transition duct assembly. The deformable metal gasket is made of copper or other softer, plastically deformable metal. When the air inlet and outlet pipes are bolted together and tightened with the transition duct assembly, the gasket deforms to enhance the sealing of the structure.

[0019] Beneficial effects: The utility model seals and installs the transition pipe assembly on the vehicle frame, and connects the air intake pipe assembly and the air outlet pipe assembly to the transition pipe assembly respectively, so that the transition pipe assembly not only serves as a part of the exhaust system, but also becomes a part of the vehicle frame. This not only frees up space for the arrangement of high-voltage wires and facilitates the arrangement of high-voltage wire harnesses and other electrical components, but also avoids the intrusion of heat sources caused by the exhaust pipe. The preparation process is simple, and when arranging, only the direction of the air intake pipe assembly in the cabin needs to be considered. The structure is simple and the layout is regular, with good heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1 This is the overall structural diagram of the exhaust system of the utility model;

[0022] Figure 2 This is the assembly drawing of the transition tube assembly and the vehicle frame of the utility model;

[0023] Figure 3 This is an axonometric view of the transition tube assembly of the present invention;

[0024] Figure 4 This is a structural diagram of the transition tube assembly of the utility model;

[0025] Figure 5 This is a structural diagram of a transition pipe assembly suitable for multiple exhaust pipes of the utility model;

[0026] Figure 6 This is a structural diagram of an embodiment of the utility model;

[0027] Figure 7This is a structural diagram of the connection between the exhaust pipes and the transition pipe assembly of the present invention. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0030] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0031] like Figure 1 and Figure 2 As shown, an exhaust system of a rigid frame mining dump truck includes an intake pipe assembly 1, a transition pipe assembly 2, and an outlet pipe assembly 3. Both ends of the transition pipe assembly 2 are sealed with a frame 4. One end of the intake pipe assembly 1 is connected to the engine, and the other end is connected to the bottom of one end of the transition pipe assembly 2. The air inlet end of the outlet pipe assembly 3 is connected to the upper part of the other end of the transition pipe assembly 2 away from the intake pipe assembly 1.

[0032] By installing the transition pipe assembly 2 on the vehicle frame 4 and connecting the air intake pipe assembly 1 and the air outlet pipe assembly 3 to the transition pipe assembly 2, the transition pipe assembly 2 becomes a part of the vehicle frame 4 while serving as a part of the exhaust system. Without destroying the original structure of the vehicle frame 4, exhaust can be achieved by simply installing the exhaust pipes at both ends. This not only frees up space for high-voltage wires and facilitates the arrangement of high-voltage wiring harnesses and other electrical components, but also avoids heat source interference caused by exhaust. The preparation process is simple, and when arranging, only the direction of the air intake pipe assembly 1 in the cabin needs to be considered. The structure is simple and the layout is regular, with good heat dissipation and lighter weight. The exhaust gas flow path is: engine-intake pipe assembly 1-transition pipe assembly 2-outlet pipe assembly 3-cargo box heating structure or muffler structure. The transition pipe assembly can be wrapped with insulation material.

[0033] In order to realize the exhaust layout of a single set of exhaust pipes, the transition pipe assembly 2 includes a straight pipe 21 with both ends sealedly connected to the frame 4 respectively. The intake pipe assembly 1 and the outlet pipe assembly 3 respectively include a first intake pipe 11 and a first outlet pipe 31. One end of the first intake pipe 11 is connected to the engine, and the other end is connected to the bottom of one end of the straight pipe 21. The air inlet end of the first outlet pipe 31 is connected to the upper part of the other end of the straight pipe 21.

[0034] To achieve a dual exhaust pipe layout, the transition duct assembly 2 further includes a closed, hollow L-shaped duct 22. The intake duct assembly 1 and the outlet duct assembly 3 each further include a second intake duct 12 and a second outlet duct 32 configured to complement the L-shaped duct 22. The longitudinal end faces of the L-shaped duct 22 are respectively sealed to the vehicle frame 4. The L-shaped inner sidewall of the L-shaped duct 22 is sealed and spliced with the adjacent outer sidewalls of the straight duct 21. One longitudinal end of the straight duct 21 is sealed to the vehicle frame 4 via the L-shaped duct 22, while the other end is sealed to the vehicle frame 4. The second intake duct 12 communicates with the bottom of one end of the L-shaped duct 22, and the second outlet duct 32 communicates with the top of the other end of the L-shaped duct 22. The L-shaped duct 22, which is sealed to the straight duct 21, conforms more closely to the vehicle frame 4 structure, facilitates welding to the frame 4, and saves space.

[0035] like Figure 3 and Figure 4 As shown, in order to arrange the positions of the air outlet pipes, the connecting hole 5 between the second air outlet pipe 32 and the L-shaped pipe 22 and the connecting hole 6 between the first air outlet pipe 31 and the straight pipe 21 are both located on the same longitudinal axis of the straight pipe 21 .

[0036] Since the outlet end of the air outlet pipe can be used to connect with the cargo box for heating the cargo box, the connecting holes 9 of the air outlet pipe are all arranged along the longitudinal axis direction of the straight pipe 21, so that the air outlet pipe can be arranged on the frame 4 away from both the cab side and the cargo box side, avoiding interference with the cargo box due to insufficient space when arranging the air outlet pipe. At the same time, the air outlet pipe arranged away from the cab side can avoid the impact of high temperature and noise on the driver, thereby improving driving comfort.

[0037] To facilitate connection of the intake pipes, the connecting holes 7 between the first intake pipe 11 and the straight pipe 21, and the connecting holes 8 between the second intake pipe 12 and the L-shaped pipe 22, are arranged in a staggered arrangement in the transverse direction. This staggered arrangement avoids lengthy, winding arrangements of the intake pipes to avoid interference with interior vehicle components, thus reducing space utilization and impacting the routing of high-voltage wiring.

[0038] like Figure 5 As shown, in order to realize the installation of multiple exhaust pipes, at least one group of the matched L-shaped pipe 22, the second air inlet pipe 12 and the second air outlet pipe 32 is provided, and the L-shaped inner side walls of adjacent L-shaped pipes 22 are sealed with the L-shaped outer side walls.

[0039] A corresponding number of L-shaped tubes 22 are provided for exhaust according to the number of exhaust pipes, so as to ensure that the overall structure of the transition tube is easy to weld to the vehicle frame 4 and reduce the difficulty of installation.

[0040] In order to facilitate the processing of the L-shaped tube 22 and enable it to be quickly processed on site, the L-shaped tube 22 includes a transverse portion 221 and a longitudinal portion 222. The transverse portion 221 is a bent structure, and the longitudinal portion 222 is a straight tube structure. The transverse portion 221 is sealed with the longitudinal portion 222 and the straight tube 21 respectively, and a through hole 9 is provided between the transverse portion 221 and the longitudinal portion 222. The second air outlet pipe 32 is connected to the upper end face of the transverse portion 221, and the second air inlet pipe 12 is connected to the bottom face of one end of the longitudinal portion 222 away from the transverse portion 221.

[0041] Simply align one end of two straight pipes of different lengths, or align straight pipes of the same length, weld their side ends together, and then weld a bent plate separately at the gap or flush position. A through hole 9 is provided between the bent plate and the longer straight pipe or one of the two equal straight pipes to form an L-shaped pipe 22 for the other exhaust pipe. This eliminates the need to separately prepare a complete L-shaped pipe 22; instead, the bent plate can be welded directly on-site. This simplifies preparation, allows for adaptability to straight pipes of varying sizes, and reduces costs. Exhaust gas enters the longitudinal portion 222 through the second intake pipe 12, passes through the through hole 9, reaches the transverse portion 221, and finally passes through the second outlet pipe 32.

[0042] In order to facilitate the connection with the vehicle frame 4, the transition tube assembly 2 is a rectangular tube. The rectangular tube structure only needs to be sealed with different types of vehicle frames 4 to achieve installation and sealing, simplifying installation, improving work efficiency, better sealing, and simple process. Figure 6 As shown, this embodiment adopts a rectangular tube structure to be welded on a cast-welded and plate-welded structure frame 4. Compared with other frames 4, it has better sealing and simple process. The different positions of the cab will only affect the influence of the exhaust temperature on the cab. The outlet of the exhaust pipe in this embodiment is designed on the vehicle model away from one end of the cab, so that the exhaust temperature will not have a high temperature effect on the cab.

[0043] In order to prevent the exhaust pipe from being damaged due to mutual vibration between the rigidly connected exhaust pipe and other components, a bellows 10 is provided on the first air inlet pipe 11 , the first air outlet pipe 31 , the second air inlet pipe 12 and the second air outlet pipe 32 .

[0044] like Figure 7 As shown, to ensure sealing, the first air inlet pipe 11, the first air outlet pipe 31, the second air inlet pipe 12, the second air outlet pipe 32 are respectively connected to the transition duct assembly 2 via flanges 13. A deformable metal gasket 14 is disposed between the flanges 13 and the transition duct assembly 2. The deformable metal gasket 14 is made of copper or other soft, plastically deformable metal. When the air inlet and outlet pipes are fastened to the transition duct assembly 2 with bolts, the gasket deforms to enhance the sealing of the structure.

[0045] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0046] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An exhaust system for a rigid frame mining dump truck, characterized in that: The invention comprises an air intake pipe assembly (1), a transition pipe assembly (2), and an air outlet pipe assembly (3), wherein both ends of the transition pipe assembly (2) are sealedly connected to the vehicle frame (4), one end of the air intake pipe assembly (1) is connected to the engine, and the other end is connected to the bottom of one end of the transition pipe assembly (2), and the air inlet end of the air outlet pipe assembly (3) is connected to the upper part of the other end of the transition pipe assembly (2) away from the air intake pipe assembly (1).

2. The exhaust system of the rigid frame mining dump truck according to claim 1, characterized in that: The transition pipe assembly (2) includes a straight pipe (21) whose two ends are sealedly connected to the vehicle frame (4), and the intake pipe assembly (1) and the outlet pipe assembly (3) respectively include a first intake pipe (11) and a first outlet pipe (31), one end of the first intake pipe (11) is connected to the engine, and the other end is connected to the bottom of one end of the straight pipe (21), and the air inlet end of the first outlet pipe (31) is connected to the upper part of the other end of the straight pipe (21).

3. The exhaust system of the rigid frame mining dump truck according to claim 2, characterized in that: The transition pipe assembly (2) further includes a closed L-shaped pipe (22) with a hollow interior, and the air intake pipe assembly (1) and the air outlet pipe assembly (3) further include a second air intake pipe (12) and a second air outlet pipe (32) respectively arranged in conjunction with the L-shaped pipe (22). The longitudinal end surfaces of the L-shaped pipe (22) are respectively sealedly connected to the vehicle frame (4). The L-shaped inner side wall of the L-shaped pipe (22) is sealed and spliced with the adjacent two outer side walls of the straight pipe (21). One longitudinal end of the straight pipe (21) is sealedly connected to the vehicle frame (4) through the L-shaped pipe (22), and the other end is sealedly connected to the vehicle frame (4). The second air intake pipe (12) is connected to the bottom of one end of the L-shaped pipe (22), and the second air outlet pipe (32) is connected to the upper part of the other end of the L-shaped pipe (22).

4. The exhaust system of the rigid frame mining dump truck according to claim 3, characterized in that: The connecting hole (5) between the second air outlet pipe (32) and the L-shaped pipe (22) and the connecting hole (6) between the first air outlet pipe (31) and the straight pipe (21) are both located on the same longitudinal axis of the straight pipe (21).

5. The exhaust system of the rigid frame mining dump truck according to claim 4, characterized in that: The connecting holes (7) between the first air inlet pipe (11) and the straight pipe (21) and the connecting holes (8) between the second air inlet pipe (12) and the L-shaped pipe (22) are arranged in a staggered manner in the transverse direction.

6. The exhaust system of the rigid frame mining dump truck according to claim 5, characterized in that: At least one group of the matched L-shaped tubes (22), the second air inlet tubes (12), and the second air outlet tubes (32) is provided, and the L-shaped inner side walls and the L-shaped outer side walls of adjacent L-shaped tubes (22) are sealed and connected.

7. The exhaust system of the rigid frame mining dump truck according to claim 3 or 6, characterized in that: The L-shaped tube (22) comprises a transverse portion (221) and a longitudinal portion (222), wherein the transverse portion (221) is a bent structure, and the longitudinal portion (222) is a straight tube structure. The transverse portion (221) is sealedly connected to the longitudinal portion (222) and the straight tube (21), respectively, and a through hole (9) is provided between the transverse portion (221) and the longitudinal portion (222). The second air outlet pipe (32) is connected to the upper end surface of the transverse portion (221), and the second air inlet pipe (12) is connected to the bottom surface of one end of the longitudinal portion (222) away from the transverse portion (221).

8. The exhaust system of the rigid frame mining dump truck according to claim 7, characterized in that: The transition pipe assembly (2) is a rectangular pipe.

9. The exhaust system of the rigid frame mining dump truck according to claim 3, characterized in that: The first air inlet pipe (11), the first air outlet pipe (31), the second air inlet pipe (12), and the second air outlet pipe (32) are all provided with a bellows (10).

10. The exhaust system of the rigid frame mining dump truck according to claim 3, characterized in that: The first air inlet pipe (11), the first air outlet pipe (31), the second air inlet pipe (12), the second air outlet pipe (32) and the transition pipe assembly (2) are respectively connected via flanges (13), and a deformable metal gasket (14) is provided between the flanges (13) and the transition pipe assembly (2).

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