Tail gas purification device and purification method of diesel locomotive

Abstract

The invention relates to the technical field of diesel locomotive tail gas purification, in particular to a diesel locomotive tail gas purification device which comprises a main purification pipe, an upper tension band is arranged on the outer side of the main purification pipe, an auxiliary purification pipe is arranged on one side of the main purification pipe, and a connecting mechanism convenient to disassemble and assemble quickly is arranged between the main purification pipe and the auxiliary purification pipe. And a fixing mechanism facilitating quick replacement of the replacement core is arranged in the main purification pipe. According to the tail gas purification device of the diesel locomotive, air holes and an air duct are arranged on a shelf fixedly connected to the interior of a main purification pipe, a purification inner core is installed in a purification cover connected to the air duct in a sleeving mode, particulate matter in tail gas can be conveniently captured, and clamping plates fixedly connected to the side wall of the purification cover are clamped with clamping arms; and a rotating rod at the bottom end of the clamping arm is fixedly connected to the shelf through a mounting plate and is controlled by a spring, so that the purification cover is conveniently limited.

Description

Technical Field

[0001] The invention relates to the technical field of diesel locomotive exhaust gas purification, in particular to an exhaust gas purification device for a diesel locomotive. Background Art

[0002] Studies on the effect of altitude on pollutant emissions in diesel engine exhaust have shown that PM increases with altitude. As altitude increases, the oxygen content inhaled into the cylinder decreases, leading to local hypoxia and worsening combustion, and an increase in PM produced by fuel pyrolysis. In order to cope with the use of diesel locomotives in high altitude areas, particulate filters need to be installed on the diesel engine exhaust pipe to purify the exhaust gas.

[0003] The above-mentioned device does not have a structure for quickly disassembling and assembling the particle trap shell and quickly replacing the particle trap inner core when in use. As a result, when existing diesel locomotives are used in high-altitude areas, the oxygen content in the inhaled cylinder of the diesel engine is low when working, and the particulate matter content in the exhaust gas is high. Compared with diesel engine vehicles in low-altitude areas, the service life of the particle trap is greatly reduced and needs to be replaced frequently. Most existing particle traps are integrated structures when in use, and it is difficult to open the shell to replace the particle trap inner core. Although the split clamp structure can quickly separate the trap shell, the shell connection stability is poor, and the replacement of the internal filter core is relatively cumbersome. Based on the deficiencies of the existing technology, the present invention designs an exhaust purification device for diesel locomotives. Summary of the invention

[0004] The invention provides an exhaust gas purification device for a diesel locomotive, which has the advantages of rapid disassembly and assembly of a particle trap shell and rapid replacement of a particle trap inner core.

[0005] The present invention provides the following technical solution: an exhaust gas purification device for a diesel locomotive, comprising a main purification pipe, an upper hoop is arranged on the outer side of the main purification pipe, a secondary purification pipe is arranged on one side of the main purification pipe, a connection mechanism for facilitating rapid disassembly and assembly is arranged between the main purification pipe and the secondary purification pipe, and a fixing mechanism for facilitating rapid replacement of a replacement core is arranged inside the main purification pipe; A fixing mechanism, the fixing mechanism includes a shelf, an air hole, an air cylinder, a second sealing strip, a purification hood, a purification inner core, a mounting plate, a rotating rod, a clamping arm, a paddle plate, a spring and a clamping plate, the shelf is fixedly connected to the inside of the main purification pipe, the air hole is penetrated and opened on the shelf, the air cylinder is fixedly connected to one side of the shelf, the second sealing strip is sleeved on the air cylinder, the purification hood is plugged on the air cylinder, the purification inner core is fixedly connected to the inside of the purification hood, the mounting plate is fixedly connected to one side of the shelf, the rotating rod is rotatably connected to the mounting plate, the clamping arm is fixedly connected to the rotating rod, the paddle plate is fixedly connected to the rotating rod, the spring is fixedly connected to the bottom of the paddle plate, and the clamping plate is fixedly connected to the side wall of the purification hood.

[0006] As a preferred technical solution of the present invention, the connecting mechanism includes a connecting ring, a connecting rod, a threaded groove, a first sealing ring, a connecting cover, a positioning hole, an oblique fastening groove and a screw. The connecting ring is fixedly connected to one end of the main purification pipe, the connecting rod is fixedly connected to the outer surface of the connecting ring, the threaded groove is opened on the outer surface of the connecting ring, the first sealing ring is fixedly connected to one side of the connecting ring, the connecting cover is fixedly connected to one end of the auxiliary purification pipe, the positioning hole is fixedly connected to the side wall of the connecting cover, the oblique fastening groove is opened through the side wall of the connecting cover, and the screw is inserted into the positioning hole.

[0007] As a preferred technical solution of the present invention, one end of the main purification pipe is fixedly connected to a waste gas inlet pipe, and one end of the auxiliary purification pipe is fixedly connected to a waste gas outlet pipe.

[0008] As a preferred technical solution of the present invention, a lower hoop is arranged below the upper hoop, and connecting holes are opened through the lower hoop and the upper hoop, and fixing bolts are inserted in the connecting holes, and the bottom of the lower hoop is fixedly connected to the base frame.

[0009] As a preferred technical solution of the present invention, the air hole, the wind tube and the inner cavity of the purification cover are connected, and the purification inner core is arranged at the rear end of the air hole and the wind tube.

[0010] As a preferred technical solution of the present invention, the front end of the clamping arm is slidably clamped in the interior of the clamping plate, and the two ends of the spring are respectively fixedly connected to the shelf and the dial plate.

[0011] As a preferred technical solution of the present invention, the second sealing strip is arranged between the shelf and the purification hood.

[0012] As a preferred technical solution of the present invention, the first sealing ring is arranged between the connecting ring and the connecting cover, the connecting rod is slidably clamped in the inside of the oblique fastening groove, the mounting hole positions of the positioning hole and the threaded groove coincide, and the screw is threadedly connected in the inside of the threaded groove.

[0013] As a preferred technical solution of the present invention, the lower hoop clamp is arranged on the side wall of the main purification pipe, and the fixing bolts are respectively penetrated and connected to the upper hoop and the lower hoop.

[0014] As a preferred technical solution of the present invention, a purification method for an exhaust gas purification device of a diesel locomotive comprises the following steps: S1: First, wrap the upper hoop and the lower hoop around the main purification pipe and fix them with fixing bolts. After connecting the exhaust gas inlet pipe with the exhaust pipe, use the base frame to fix the main purification pipe, auxiliary purification pipe and exhaust gas outlet pipe on the equipment. S2: Then the exhaust gas in the exhaust pipe enters the main purification pipe through the exhaust gas inlet pipe. The exhaust gas entering the main purification pipe will flow into the auxiliary purification pipe through the air hole, the air cylinder, the purification cover and the purification inner core, and the particulate matter contained in the exhaust gas can be intercepted and filtered by the purification inner core; S3: Finally, when the purification core reaches the end of its service life, the main purification tube and the auxiliary purification tube are separated by using the connecting mechanism, and then the paddle is pressed to separate and unlock the clamping arm and the clamping plate, and the purification cover and the purification core are replaced.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The exhaust gas purification device of the diesel locomotive is provided by placing the first sealing ring on one side of the connecting ring, and then aligning the connecting cover with the connecting ring and inserting it, so that the connecting rod on the connecting ring is inserted into the oblique fastening groove, and then the connecting cover is rotated to one side and the oblique fastening groove is driven to rotate accordingly, and the rotating oblique fastening groove drives the connecting cover and the auxiliary purification pipe to move in the direction of the main purification pipe under the limit of the connecting rod and squeezes the first sealing ring, until the connecting rod is inserted to the innermost end of the oblique fastening groove under the rotation of the oblique fastening groove, and then the main purification pipe and the auxiliary purification pipe are sealed and connected under the action of the first sealing ring, and the positioning hole and the thread groove coincide, and finally the screw is inserted into the positioning hole and screwed into the thread groove to lock the connecting ring, the connecting cover, the main purification pipe and the auxiliary purification pipe, and the main purification pipe and the auxiliary purification pipe can be quickly disassembled by removing the screw and twisting the auxiliary purification pipe in the opposite direction according to the above steps, and the device is convenient for quickly disassembling the main purification pipe and the auxiliary purification pipe.

[0016] 2. The exhaust gas purification device of the diesel locomotive is as follows: after the auxiliary purification pipe is removed from the main purification pipe, the paddle is pressed downward by a long rod to drive the clamping arm to rotate through the rotating rod and be pulled out from the clamping plate to release the clamping connection and compress the spring, and then the purification cover and the purification inner core are pulled out from the air duct and removed. At this time, the new purification cover and the purification inner core are aligned with the air duct and inserted, and then the positions of the clamping plates on the left and right sides are rotated and adjusted to be aligned with the clamping arms, and then the new purification cover and the purification inner core are inserted downward under the limit of the air duct to make them contact with the second sealing strip and squeeze and seal. During the downward insertion process, the clamping plate squeezes the clamping arm outward and slides on its surface until the purification cover moves downward to squeeze the second sealing strip and is completely sealed. Then, the spring pushes the paddle to rotate and drives the clamping arm to rotate and clamp into the corresponding groove of the clamping plate to lock the new purification cover and the purification inner core. The device is convenient for rapid replacement of the purification cover and the purification inner core. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the purification tube body of the present invention; Figure 3 This is a schematic diagram of the connection structure between the purification tube and the hoop of the present invention; Figure 4 This is a schematic diagram of the exploded structure of the connecting mechanism of the present invention; Figure 5 It is a schematic diagram of the internal structure of the connecting mechanism of the present invention; Figure 6 It is a structural schematic diagram of the fixing mechanism of the present invention; Figure 7 This is a schematic diagram of the inner structure of the fixing mechanism of the present invention; Figure 8 It is a schematic diagram of the explosion structure of the fixing mechanism of the present invention.

[0018] In the figure: 1. main purification pipe; 101. exhaust gas inlet pipe; 102. auxiliary purification pipe; 103. exhaust gas outlet pipe; 2. upper hoop; 201. lower hoop; 202. connecting hole; 203. fixing bolt; 204. base frame; 3. connecting mechanism; 301. connecting ring; 302. connecting rod; 303. threaded groove; 304. first sealing ring; 305. connecting cover; 306. positioning hole; 307. oblique fastening groove; 308. screw; 4. fixing mechanism; 401. shelf; 402. air hole; 403. air cylinder; 404. second sealing strip; 405. purification cover; 406. purification inner core; 407. mounting plate; 408. rotating rod; 409. clamping arm; 410. dial plate; 411. spring; 412. clamping plate. DETAILED DESCRIPTION

[0019] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-8 The exhaust gas purification device of a diesel locomotive comprises a main purification pipe 1, an upper hoop 2 is arranged on the outer side of the main purification pipe 1, a secondary purification pipe 102 is arranged on one side of the main purification pipe 1, a connecting mechanism 3 for facilitating quick disassembly and assembly is arranged between the main purification pipe 1 and the secondary purification pipe 102, a fixing mechanism 4 for facilitating quick replacement of a core is arranged inside the main purification pipe 1, one end of the main purification pipe 1 is fixedly connected to an exhaust gas inlet pipe 101, and one end of the secondary purification pipe 102 is fixedly connected to an exhaust gas outlet pipe 103.

[0021] See also Figure 1-8A lower hoop 201 is arranged below the upper hoop 2, and a connecting hole 202 is penetrated through the lower hoop 201 and the upper hoop 2, and a fixing bolt 203 is inserted in the connecting hole 202. A base frame 204 is fixedly connected to the bottom of the lower hoop 201, and the lower hoop 201 is arranged on the side wall of the main purification pipe 1, and the fixing bolts 203 are respectively penetrated and connected to the upper hoop 2 and the lower hoop 201.

[0022] See also Figure 6-8 , the fixing mechanism 4 includes a shelf 401, an air hole 402, a wind tube 403, a second sealing strip 404, a purification cover 405, a purification core 406, a mounting plate 407, a rotating rod 408, a clamping arm 409, a paddle plate 410, a spring 411 and a clamping plate 412. The shelf 401 is fixedly connected to the inside of the main purification pipe 1, the air hole 402 is opened on the shelf 401, the wind tube 403 is fixedly connected to one side of the shelf 401, the second sealing strip 404 is sleeved on the wind tube 403, the purification cover 405 is plugged on the wind tube 403, the purification core 406 is fixedly connected to the inside of the purification cover 405, and the mounting plate 407 is fixedly connected to the shelf 4 01, the rotating rod 408 is rotatably connected to the mounting plate 407, the clamping arm 409 is fixedly connected to the rotating rod 408, the dial plate 410 is fixedly connected to the rotating rod 408, the spring 411 is fixedly connected to the bottom of the dial plate 410, the clamping plate 412 is fixedly connected to the side wall of the purification hood 405, the air hole 402, the air cylinder 403 and the inner cavity of the purification hood 405 are communicated, and the purification inner core 406 is arranged at the rear end of the air hole 402 and the air cylinder 403, the front end of the clamping arm 409 is slidably clamped in the inside of the clamping plate 412, the two ends of the spring 411 are respectively fixedly connected to the shelf 401 and the dial plate 410, and the second sealing strip 404 is arranged between the shelf 401 and the purification hood 405.

[0023] By providing a shelf 401, an air hole 402, a wind tube 403, a purification hood 405 and a purification core 406, the exhaust gas entering the main purification pipe 1 can be filtered and purified. By providing a second sealing strip 404, the sealing performance of the connection between the purification hood 405, the shelf 401 and the wind tube 403 can be improved. By providing a mounting plate 407, a rotating rod 408, a clamping arm 409 and a clamping plate 412, the installed purification hood 405 and the purification core 406 can be locked. By providing a dial plate 410 and a spring 411, support can be provided for the clamping arm 409 so that it is always clamped in the clamping plate 412 without being affected by other external forces.

[0024] See also Figure 4-5The connecting mechanism 3 includes a connecting ring 301, a connecting rod 302, a threaded groove 303, a first sealing ring 304, a connecting cover 305, a positioning hole 306, an oblique fastening groove 307 and a screw 308. The connecting ring 301 is fixedly connected to one end of the main purification pipe 1, the connecting rod 302 is fixedly connected to the outer surface of the connecting ring 301, the threaded groove 303 is opened on the outer surface of the connecting ring 301, the first sealing ring 304 is fixedly connected to one side of the connecting ring 301, and the connecting cover 305 is fixedly connected to At one end of the auxiliary purification pipe 102, the positioning hole 306 is fixedly connected to the side wall of the connecting cover 305, the oblique fastening groove 307 is penetrated and opened in the side wall of the connecting cover 305, the screw 308 is penetrated and inserted in the positioning hole 306, the first sealing ring 304 is arranged between the connecting ring 301 and the connecting cover 305, the connecting rod 302 is slidably engaged in the inside of the oblique fastening groove 307, the mounting hole positions of the positioning hole 306 and the threaded groove 303 coincide, and the screw 308 is threadedly connected to the inside of the threaded groove 303.

[0025] By providing a connecting ring 301, a connecting rod 302, a connecting cover 305 and an oblique fastening groove 307, and a first sealing ring 304 is provided between the connecting ring 301 and the connecting cover 305, so as to facilitate the connection of the main purification pipe 1 and the auxiliary purification pipe 102, and the first sealing ring 304 is used to seal the connection between the main purification pipe 1 and the auxiliary purification pipe 102, and by providing a threaded groove 303, a positioning hole 306 and a screw 308, the connecting ring 301 and the connecting cover 305 that have been connected are locked to prevent reverse rotation and loosening due to vibration during subsequent use.

[0026] See also Figure 1-8 , a purification method for an exhaust gas purification device of a diesel locomotive comprises the following steps: S1: First, the upper hoop 2 and the lower hoop 201 are clamped around the main purification pipe 1 and fixed with the fixing bolts 203, and the exhaust gas inlet pipe 101 is connected to the exhaust pipe, and the main purification pipe 1, the auxiliary purification pipe 102 and the exhaust gas outlet pipe 103 are fixed on the equipment with the base frame 204; S2: The exhaust gas in the exhaust pipe then enters the interior of the main purification pipe 1 through the exhaust gas inlet pipe 101. The exhaust gas entering the main purification pipe 1 flows into the auxiliary purification pipe 102 through the air hole 402, the air cylinder 403, the purification cover 405 and the purification inner core 406, and the particulate matter contained in the exhaust gas can be intercepted and filtered by the purification inner core 406. S3: Finally, after the purification core 406 reaches the end of its service life, the main purification tube 1 and the auxiliary purification tube 102 are separated by using the connecting mechanism 3, and then the dial plate 410 is pressed to separate and unlock the clamping arm 409 and the clamping plate 412, and the purification cover 405 and the purification core 406 can be replaced.

[0027] Working principle: when the exhaust gas purification device of a diesel locomotive is used, in the initial state, the auxiliary purification pipe 102 is arranged at one end of the main purification pipe 1, and the outer ends of the main purification pipe 1 and the auxiliary purification pipe 102 are respectively connected with the exhaust gas inlet pipe 101 and the exhaust gas outlet pipe 103, so as to guide and discharge the exhaust gas of the diesel locomotive, and the upper hoop 2 and the lower hoop 201 arranged on the main purification pipe 1 are connected by the connection hole 202 and the fixing bolt 203, and the bottom of the lower hoop 201 is installed with a base frame 204, so as to install the main purification pipe 1 at the exhaust pipe of the diesel locomotive and connect and fix it, and the main purification pipe 1 and the auxiliary purification pipe 102 are respectively provided with a connecting ring 301 and a connecting cover 305, and the connecting rod 302 and the threaded groove 303 arranged on the connecting ring 301 are connected to each other. 03 are respectively connected with the positioning hole 306 and the oblique fastening groove 307, and the screw 308 passes through the positioning hole 306 and is threadedly connected to the inside of the thread groove 303, so as to quickly connect the main purification pipe 1 and the auxiliary purification pipe 102. At the same time, the shelf 401 fixedly connected to the inside of the main purification pipe 1 is provided with an air hole 402 and a wind tube 403, and the purification cover 405 sleeved on the wind tube 403 is installed with a purification core 406, so as to capture particulate matter in the exhaust gas, and the clamping plate 412 fixedly connected to the side wall of the purification cover 405 is clamped with the clamping arm 409, and the rotating rod 408 at the bottom end of the clamping arm 409 is fixedly connected to the shelf 401 through the mounting plate 407 and is controlled by the spring 411, so as to limit the purification cover 405; When it is necessary to quickly disassemble the main purification pipe 1 and the auxiliary purification pipe 102, first place the first sealing ring 304 on one side of the connecting ring 301, and then align the connecting cover 305 with the connecting ring 301 and insert it, so that the connecting rod 302 on the connecting ring 301 is inserted into the oblique fastening groove 307, and then the connecting cover 305 is rotated to one side to drive the oblique fastening groove 307 to rotate accordingly. The rotating oblique fastening groove 307 drives the connecting cover 305 and the auxiliary purification pipe 102 to move in the direction of the main purification pipe 1 under the limit of the connecting rod 302 and squeezes the first sealing ring 304 until the connecting rod 302 is in the oblique fastening groove 307. Rotate and insert it to the innermost end of the oblique fastening groove 307. At this time, the main purification tube 1 and the auxiliary purification tube 102 are sealed and connected under the action of the first sealing ring 304, and the positioning hole 306 coincides with the thread groove 303. Finally, insert the screw 308 into the positioning hole 306 and screw it into the thread groove 303 to lock the connecting ring 301, the connecting cover 305, the main purification tube 1 and the auxiliary purification tube 102. To quickly disassemble the main purification tube 1 and the auxiliary purification tube 102, you only need to remove the screw 308 and reversely twist the auxiliary purification tube 102 according to the above steps. The device is convenient for quickly disassembling the main purification tube 1 and the auxiliary purification tube 102.

[0028] When it is necessary to quickly replace the purification cover 405 and the purification inner core 406, first wait for the auxiliary purification tube 102 to be removed from the main purification tube 1, use the long rod to press the dial plate 410 downward so that it drives the clamping arm 409 to rotate through the rotating rod 408 and is pulled out from the clamping plate 412 to release its clamping connection and compress the spring 411, then the purification cover 405 and the purification inner core 406 are pulled out from the air cylinder 403, and the new purification cover 405 and the purification inner core 406 are aligned and inserted into the air cylinder 403, and then the positions of the clamping plates 412 on the left and right sides are rotated to adjust them to align with the clamping arms 409, and then The new purification hood 405 and purification inner core 406 are inserted downward under the limit of the wind tube 403 so that they come into contact with the second sealing strip 404 and squeeze and seal. During the downward insertion process, the card plate 412 squeezes the card arm 409 to expand outward and slide on its surface until the purification hood 405 moves downward to squeeze the second sealing strip 404 and completely seals. The spring 411 pushes the dial plate 410 to rotate and drives the card arm 409 to rotate and snap into the corresponding groove of the card plate 412 to lock the new purification hood 405 and purification inner core 406. The device facilitates the rapid replacement of the purification hood 405 and the purification inner core 406.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An exhaust gas purification device for a diesel locomotive, comprising a main purification pipe (1), characterized in that: An upper hoop (2) is arranged on the outside of the main purification tube (1), a secondary purification tube (102) is arranged on one side of the main purification tube (1), a connection mechanism (3) for facilitating quick disassembly and assembly is arranged between the main purification tube (1) and the secondary purification tube (102), and a fixing mechanism (4) for facilitating quick replacement of a refill is arranged inside the main purification tube (1); The fixing mechanism (4) comprises a shelf (401), an air hole (402), an air cylinder (403), a second sealing strip (404), a purification cover (405), a purification inner core (406), a mounting plate (407), a rotating rod (408), a clamping arm (409), a paddle plate (410), a spring (411) and a clamping plate (412), wherein the shelf (401) is fixedly connected to the inside of the main purification pipe (1), the air hole (402) is opened through the shelf (401), the air cylinder (403) is fixedly connected to one side of the shelf (401), and the second sealing strip (404) is sleeved. The purification cover (405) is placed on the air duct (403), the purification core (406) is fixedly connected to the inside of the purification cover (405), the mounting plate (407) is fixedly connected to one side of the shelf (401), the rotating rod (408) is rotatably connected to the mounting plate (407), the clamping arm (409) is fixedly connected to the rotating rod (408), the dial plate (410) is fixedly connected to the rotating rod (408), the spring (411) is fixedly connected to the bottom of the dial plate (410), and the clamping plate (412) is fixedly connected to the side wall of the purification cover (405).

2. The exhaust gas purification device for a diesel locomotive according to claim 1, characterized in that: The connecting mechanism (3) comprises a connecting ring (301), a connecting rod (302), a threaded groove (303), a first sealing ring (304), a connecting cover (305), a positioning hole (306), an oblique fastening groove (307) and a screw (308); the connecting ring (301) is fixedly connected to one end of the main purification pipe (1); the connecting rod (302) is fixedly connected to the outer surface of the connecting ring (301); the threaded groove (303) is provided on the outer surface of the connecting ring (301); the first sealing ring (304) is fixedly connected to one side of the connecting ring (301); the connecting cover (305) is fixedly connected to one end of the auxiliary purification pipe (102); the positioning hole (306) is fixedly connected to the side wall of the connecting cover (305); the oblique fastening groove (307) penetrates through the side wall of the connecting cover (305); and the screw (308) penetrates and is inserted into the positioning hole (306).

3. The exhaust gas purification device for a diesel locomotive according to claim 1, characterized in that: One end of the main purification pipe (1) is fixedly connected to an exhaust gas inlet pipe (101), and one end of the auxiliary purification pipe (102) is fixedly connected to an exhaust gas outlet pipe (103).

4. The exhaust gas purification device for a diesel locomotive according to claim 1, characterized in that: A lower hoop (201) is provided below the upper hoop (2), a connecting hole (202) is provided through the lower hoop (201) and the upper hoop (2), a fixing bolt (203) is inserted into the connecting hole (202), and a bottom frame (204) is fixedly connected to the bottom of the lower hoop (201).

5. The exhaust gas purification device for a diesel locomotive according to claim 1, characterized in that: The air hole (402), the air cylinder (403) and the inner cavity of the purification cover (405) are in communication with each other, and the purification inner core (406) is arranged at the rear ends of the air hole (402) and the air cylinder (403).

6. The exhaust gas purification device for a diesel locomotive according to claim 1, characterized in that: The front end of the clamping arm (409) is slidably clamped inside the clamping plate (412), and the two ends of the spring (411) are respectively fixedly connected to the shelf (401) and the dial plate (410).

7. The exhaust gas purification device for a diesel locomotive according to claim 1, characterized in that: The second sealing strip (404) is arranged between the shelf (401) and the purification cover (405).

8. The exhaust gas purification device for a diesel locomotive according to claim 2, characterized in that: The first sealing ring (304) is arranged between the connecting ring (301) and the connecting cover (305), the connecting rod (302) is slidably engaged inside the oblique fastening groove (307), the mounting hole positions of the positioning hole (306) and the threaded groove (303) coincide with each other, and the screw (308) is threadedly engaged inside the threaded groove (303).

9. The exhaust gas purification device for a diesel locomotive according to claim 4, characterized in that: The lower hoop (201) is arranged on the side wall of the main purification pipe (1), and the fixing bolts (203) are respectively connected to the upper hoop (2) and the lower hoop (201).

10. A purification method for an exhaust gas purification device of a diesel locomotive, characterized in that: The following steps are involved: S1: First, the upper hoop (2) and the lower hoop (201) are clamped around the main purification pipe (1) and fixed using fixing bolts (203), and after the exhaust gas inlet pipe (101) is connected to the exhaust pipe, the main purification pipe (1), the auxiliary purification pipe (102) and the exhaust gas outlet pipe (103) are fixed to the equipment using a base frame (204); S2: The exhaust gas in the exhaust pipe then enters the interior of the main purification pipe (1) through the exhaust gas inlet pipe (101). The exhaust gas entering the main purification pipe (1) flows into the auxiliary purification pipe (102) through the air hole (402), the air cylinder (403), the purification cover (405) and the purification inner core (406), and the particulate matter contained in the exhaust gas can be intercepted and filtered by the purification inner core (406); S3: Finally, after the purification inner core (406) reaches the end of its service life, the main purification tube (1) and the auxiliary purification tube (102) are separated by using the connecting mechanism (3), and then the dial plate (410) is pressed to separate and unlock the clamping arm (409) and the clamping plate (412), and the purification cover (405) and the purification inner core (406) are replaced.

Images