Dust-free sand adding device for motor train unit

Abstract

The invention belongs to the technical field of motor train unit sand adding devices, and particularly relates to a motor train unit dust-free sand adding device which comprises a first bearing box, a second bearing box is arranged in the first bearing box, and the second bearing box is used for bearing sand; the first bearing box communicates with a first pipeline, the end, away from the first bearing box, of the first pipeline communicates with a movable crushing assembly, the movable crushing assembly further communicates with a second pipeline, and the end, away from the movable crushing assembly, of the second pipeline communicates with the second bearing box. After caked sand in the second bearing box flows to the movable crushing assembly through the second pipeline, the movable crushing assembly can crush the caked sand and can drive the second bearing box to move, the crushed caked sand flows into the first bearing box through the first pipeline, and a hose is arranged at the bottom of the first bearing box and can be in butt joint with a sand box of the motor train unit; by means of the internal circulation design, movement and crushing of caked sand are achieved, and dust-free sand adding of a sand box of a motor train unit is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of sand adding devices for bullet trains, and particularly to a dust-free sand adding device for bullet trains. Background Art

[0002] Brake sand for rail vehicles is used to prevent the vehicle from slipping during operation. Usually, a sand box is provided beside the wheels, which is mainly used to sprinkle sand on the track when climbing slopes and braking to increase the frictional force of the contact surface. For convenient operation, during maintenance, high-speed trains are higher than the ground. During the maintenance process, sand needs to be added to the sand box. Since the sand box is at a high position, manual sand adding has low work efficiency, and the working environment is poor, which poses a threat to the health of the staff. Using a screw conveyor to transport sand and gravel easily causes jamming, and some sand and gravel are crushed during transportation and cannot meet the particle size requirements. Using a conveyor belt to transport sand and gravel also has the risk of the transmission components being stuck by sand and gravel, and neither can meet the sand adding requirements.

[0003] In recent years, high-pressure air pump type automatic sand loading machines have emerged to replace manual sand loading. High-pressure air flow is used to carry sand and gravel for sand adding, which greatly improves production efficiency and reduces labor costs. However, it is found during use that the high-pressure air flow carrying sand and gravel easily causes serious air pollution. Moreover, if the sand is stored for a long time, there is a risk of caking, and the existing sand adding devices cannot timely process the caked sand, and can only pick out the caked sand from it, further increasing the labor burden of the staff. In view of this, the present invention provides a dust-free sand adding device for bullet trains. Summary of the Invention

[0004] Aiming at the above defects, the present invention aims to provide a dust-free sand adding device for bullet trains. The heat exchanger includes a first bearing box, a second bearing box, a filter screen, a moving crushing assembly, a spring assembly, etc., so as to realize the movement of the present invention, shock absorption during movement, filtration of non-caked sand, and dust-free crushing of caked sand.

[0005] To achieve the above object, the present invention provides a dust-free sand adding device for bullet trains, including a first bearing box. A second bearing box is arranged inside the first bearing box, and the second bearing box is used to carry sand; a first pipeline is connected to the first bearing box, and one end of the first pipeline far from the first bearing box is connected to a moving crushing assembly. The moving crushing assembly is also connected to a second pipeline, and one end of the second pipeline far from the moving crushing assembly is connected to the second bearing box; when the caked sand in the second bearing box flows to the moving crushing assembly through the second pipeline, the moving crushing assembly can not only crush the caked sand, but also drive the second bearing box to move. The crushed caked sand flows into the first bearing box through the first pipeline. A hose is arranged at the bottom of the first bearing box, and the hose can be docked with the sand box of the bullet train.

[0006] Furthermore, a filter screen is provided at the bottom of the second bearing box, and the filter screen can filter the sand in the second bearing box into the first bearing box; both the first pipeline and the second pipeline are made of metal materials, and spring assemblies are provided on both the first pipeline and the second pipeline. The spring assemblies can not only reduce the vibration during the movement of the first bearing box, but also cooperate with the filter screen to improve the filtering efficiency of the unclumped sand in the second bearing box.

[0007] Furthermore, the mobile crushing assembly includes a crushing box, a crushing wheel, a rolling wheel, and a first roller shaft; one side of the crushing box is connected to the first pipeline, and the other side is connected to the second pipeline; the first roller shaft vertically passes through the left and right sides of the crushing box and is rotatably connected to the left and right sides of the crushing box. Rolling wheels are connected to both ends of the first roller shaft, and a plurality of crushing wheels are fixedly connected to the middle part between the two end faces of the first roller shaft. The crushing wheels are located inside the crushing box and are used for crushing the clumped sand in the crushing box.

[0008] Furthermore, the mobile crushing assembly further includes a driving motor, a second roller shaft, and a transmission component; the arrangement of the second roller shaft is the same as that of the first roller shaft, and the second roller shaft is arranged staggeredly with the first roller shaft. The second roller shaft is connected to the first roller shaft through the transmission component, and the transmission component can realize the synchronous movement of the first roller shaft and the second roller shaft; the second roller shaft is detachably connected to the rolling wheel; the first roller shaft is connected to the output shaft of the driving motor.

[0009] Furthermore, the first pipeline includes a first upper pipeline and a first lower pipeline, and the first upper pipeline is connected to the first lower pipeline through a spring assembly; the second pipeline includes a second upper pipeline and a second lower pipeline, and the second upper pipeline is connected to the second lower pipeline through a spring assembly; the spring assembly includes a damping rod, a damping cylinder, and a damping spring; one end of the damping rod is connected to the inner surface of the first lower pipeline or the second lower pipeline, and the other end is connected to the damping spring. The end of the damping spring away from the damping rod is connected to the inner surface of the first upper pipeline or the second upper pipeline. The damping cylinder is sleeved outside the damping spring and is in sliding contact with the damping rod, and the damping rod is fixed to the inner surface of the first upper pipeline or the second upper pipeline.

[0010] Furthermore, the shape of the first upper pipeline is a right-angled shape. The first upper pipeline includes a horizontal pipe and a vertical pipe. The horizontal pipe is sleeved outside the second pipeline, and the vertical pipe is connected to the second lower pipeline through a spring assembly. The first pipeline, the second pipeline, and the crushing box form a rectangle.

[0011] Furthermore, the bottom of the first bearing box is in the shape of a frustum of a cone. The hose component includes a hose and a dust-proof cover. One end of the hose is connected to the bottom of the first bearing box, and the other end is connected to the dust-proof cover. The dust-proof cover can completely cover the opening of the sand box of the EMU.

[0012] Compared with the prior art, the present invention has at least the following beneficial effects:

[0013] 1. The dust-free sand adding device for this multiple unit train realizes the movement of the present invention and can crush caked sand by setting a first bearing box, a second bearing box, a first pipeline, a second pipeline and a mobile crushing component. At the same time, through this internal circulation design, the sand is transferred from the second bearing box to the first bearing box without contacting the outside world, thus realizing the dust-free treatment of the sand inside the device of the present invention.

[0014] 2. The dust-free sand adding device for this multiple unit train is provided with spring components on the first pipeline and the second pipeline, and in combination with the use of a filter screen, on the one hand, it can reduce the impact on the present invention caused by uneven road conditions during the movement of the crushing and moving component, and on the other hand, it can utilize the shaking of the spring after being impacted to cause the shaking of the filter screen at the bottom of the second bearing box, thereby improving the speed of filtering the sand in the second bearing box into the first bearing box.

[0015] 3. The dust-free sand adding device for this multiple unit train arranges the first pipeline, the second pipeline and the mobile crushing component into a rectangular shape. On the one hand, it reduces the space occupied by relevant components, making the structure of the present invention more compact; on the other hand, this setting has a more stable supporting effect compared to a single pipeline supporting on one side of the mobile crushing component.

[0016] 4. The dust-free sand adding device for this multiple unit train sets the bottom shape of the first bearing box as a frustum of a cone shape in order to enable the sand to gather well at the bottom of the first bearing box, so as to flow into the hose, facilitating the sand adding work of the present invention. Description of the Drawings

[0017] Figure 1 is a perspective view of the dust-free sand adding device for the multiple unit train of the present invention;

[0018] Figure 2 is a structural diagram of the dust-free sand adding device for the multiple unit train of the present invention;

[0019] Figure 3 is a structural diagram of the dust-free sand adding device for the multiple unit train of the present invention;

[0020] Figure 4 is a front view of the dust-free sand adding device for the multiple unit train of the present invention with a driving motor;

[0021] Figure 5 is Figure 4 a partial enlarged cross-sectional view taken along line A - A in

[0022] Figures 1-5Chinese: 100, the first carrier box; 110, the second carrier box; 111, the filter screen; 120, the first pipeline; 121, the first upper pipeline; 122, the first lower pipeline; 130, the second pipeline; 131, the second upper pipeline; 132, the second lower pipeline; 140, the hose component; 141, the hose; 142, the dust-proof cover; 150, the end cover; 200, the mobile crushing component; 210, the crushing box; 220, the crushing wheel; 230, the rolling wheel; 240, the first roller shaft; 250, the driving motor; 260, the second roller shaft; 270, the transmission component; 300, the spring component; 310, the shock-absorbing rod; 320, the shock-absorbing cylinder; 330, the shock-absorbing spring. Detailed implementation manners

[0023] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is habitually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0024] In the description of this embodiment, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense.

[0025] To make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the drawings.

[0026] Refer to Figures 1 to 5 , this embodiment discloses a dust-free sand adding device for a multiple unit train, including a first carrier box 100. A second carrier box 110 is provided inside the first carrier box 100, and the second carrier box 110 is used to carry sand. A hose 141 is provided at the bottom of the first carrier box 100, and the hose 141 can be docked with the sand box of the multiple unit train. A filter screen 111 is provided at the bottom of the second carrier box 110, and the filter screen 111 can filter the sand in the second carrier box 110 into the first carrier box 100. The bottom of the first carrier box 100 is in the shape of a frustum of a cone. The hose component 140 includes a hose 141 and a dust-proof cover 142. One end of the hose 141 communicates with the bottom of the first carrier box 100, and the other end communicates with the dust-proof cover 142. The dust-proof cover 142 can completely cover the opening of the sand box of the multiple unit train.

[0027] Furthermore, a plurality of connecting columns are provided between the first carrier box 100 and the second carrier box 110 to connect the two. End caps 150 are provided on the tops of the first carrier box 100 and the second carrier box 110. Sealing rings are provided at the interfaces between the end caps 150 and the first carrier box 100 and the second carrier box 110, so as to ensure the sealing of the end caps 150 to the first carrier box 100 and the second carrier box 110. Both the first carrier box 100 and the second carrier box 110 are cylindrical in shape, and the end cap 150 is a circular plate. The second carrier box 110 is located in the upper half inside the first carrier box 100. There is a relatively large fixed distance between the bottom filter screen 111 of the first carrier box 100 and the frustum at the bottom of the second carrier box 110, so as to ensure that the sand filtered by the filter screen 111 can be stored in the lower half inside the first carrier box 100. The holes of the filter screen 111 are relatively large, ensuring that the unclumped sand can smoothly pass through the holes of the filter screen 111 and thus enter the lower half inside the first carrier box 100, while the sand with larger lumps cannot pass through the filter screen 111. The dust-proof cover 142 is sleeved on the opening at one end of the hose 141 and can completely cover the sand box opening of the EMU.

[0028] When this embodiment is in use, the operator opens the end caps 150 on the tops of the first carrier box 100 and the second carrier box 110, and then pours the sand used for the EMU into the second carrier box 110. During the sand pouring process, the sand will be filtered through the filter screen 111 into the lower half inside the first carrier box 100, while the clumped sand will be blocked by the filter screen 111 in the second carrier box 110. Subsequently, the hose 141 is connected to the sand box of the EMU, and the dust-proof cover 142 on the hose 141 can completely cover the opening of the sand box. Through this design, it is possible to avoid the clumped sand from flowing into the sand box of the EMU and the resulting adverse consequences. At the same time, during the sand filling process, since the sand flows into the sand box of the EMU through the first carrier box 100 and the dust-proof cover 142 at the front end of the hose 141 will completely cover the sand filling port of the sand box of the EMU, it is possible to avoid the generation of dust outside the sand during the sand filling process, thus achieving a dust-free sand filling effect.

[0029] As a further solution of this embodiment: The first carrier box 100 is connected to a first pipeline 120. One end of the first pipeline 120 away from the first carrier box 100 is connected to a mobile crushing component. The mobile crushing component is also connected to a second pipeline 130. One end of the second pipeline 130 away from the mobile crushing component is connected to the second carrier box 110; The mobile crushing component includes a crushing box 210, a crushing wheel 220, a rolling wheel 230, and a first roller shaft 240; One side of the crushing box 210 is connected to the first pipeline 120, and the other side is connected to the second pipeline 130; The first roller shaft 240 vertically passes through the left and right sides of the crushing box 210 and is rotatably connected to the left and right sides of the crushing box 210. Both ends of the first roller shaft 240 are connected to the rolling wheel 230. The middle part between the two end faces of the first roller shaft 240 is fixedly connected with a plurality of crushing wheels 220. The crushing wheels 220 are located inside the crushing box 210. The crushing wheels 220 are used to crush the caked sand in the crushing box 210; When the caked sand in the second carrier box 110 flows to the mobile crushing component through the second pipeline 130, the mobile crushing component can not only crush the caked sand but also drive the second carrier box 110 to move. The crushed caked sand flows into the first carrier box 100 through the first pipeline 120.

[0030] Furthermore, the shape of the crushing box 210 is a rectangular box; The crushing wheel 220 is a disc, and a plurality of arc holes are provided on the outer circular edge of the disc for crushing the caked sand; A conventional sand suction device is provided in the crushing box 210 to suck the sand in the second carrier box 110 into the crushing box 210 through the second pipeline 130; A sand suction device is also provided in the first carrier box 100 to suck the sand in the crushing box 210 into the first carrier box 100 through the first pipeline 120. The sand suction principle of the sand suction device refers to that of a vacuum cleaner.

[0031] To avoid the situation of caking of the sand added to the first carrier box 100, the sand can be first added to the second carrier box 110. The non-caked sand is filtered through the filter screen 111 at the bottom of the second carrier box into the first carrier box 100, while the caked sand cannot pass through the filter screen 111. After that, the sand is sucked from the second carrier box 110 into the crushing box 210 by the sand suction device of the crushing box 210. When the caked sand enters the crushing box 210, the rotating crushing wheel 220 crushes the caked sand. The rotation of the crushing wheel 220 needs to be realized by the rotation of the rolling wheel 230. Therefore, when the rolling wheel 230 rolls along the ground, the first roller shaft 240 and the crushing wheel 220 connected to the rolling wheel 230 will rotate together, so as to crush the caked sand in the crushing box 210. When the caked sand is completely crushed, the crushed sand is sucked into the interior of the first carrier box 100 by the sand suction device located in the first carrier box 100, thus completing the crushing process of the caked sand. Of course, the non-caked sand sucked into the crushing box 210 will also eventually flow into the first carrier. Through this design, the present invention realizes multiple functions of a device, not only realizes the mobility of the present invention, but also completes the crushing function of the caked sand.

[0032] As a further solution of this embodiment: The mobile crushing assembly further includes a driving motor 250, a second roller shaft 260 and a transmission component 270. The setting of the second roller shaft 260 is the same as that of the first roller shaft 240, and the second roller shaft 260 and the first roller shaft 240 are arranged in a staggered manner. The second roller shaft 260 is connected to the first roller shaft 240 through the transmission component 270, and the transmission component 270 can realize the synchronous movement of the first roller shaft 240 and the second roller shaft 260. The second roller shaft 260 is detachably connected to the rolling wheel 230. The first roller shaft 240 is connected to the output shaft of the driving motor 250.

[0033] Further, the transmission component 270 can set a driving pulley, a driven pulley and a belt on the first roller shaft 240 to realize the synchronous rotation of the first roller shaft 240 and the second roller shaft 260. At the same time, square holes can be provided on the end faces of the first roller shaft 240 and the rolling wheel 230. Then, one end of a U-shaped pin is inserted into the square hole of the rolling wheel 230, and the other end is inserted into the square hole of the first roller shaft 240. The first roller shaft 240 and the rolling wheel 230 are connected through the U-shaped pin. The plug of the U-shaped pin is a square block. Through this design, it can be ensured that the first roller shaft 240 and the rolling wheel 230 connected by the U-shaped pin can rotate synchronously. At the same time, when the first roller shaft 240 and the rolling wheel 230 are disconnected, the operator can directly drive the first roller shaft 240 to rotate to realize the synchronous rotation of the crushing wheel 220. Similarly, the second roller shaft 260 and the rolling wheel 230 are also detachably connected through the U-shaped pin.

[0034] By setting the second roller shaft 260 and not connecting the second roller shaft 260 to the rolling wheel 230, the rotation speed of the crushing wheel 220 can be controlled according to the installation of rolling wheels 230 with different diameters. If there is a large amount of caked sand, a rolling wheel 230 with a smaller diameter needs to be installed to increase the rotation speed of the crushing wheel 220. If there is less caked sand, a rolling wheel 230 with a larger diameter needs to be installed, and the rolling wheel 230 with a larger diameter can facilitate the operator to quickly push the present invention to the designated sand-adding work location. By setting the driving motor 250, the manual movement and electric movement of the present invention can be switched. Using motor drive can enable the present invention to load more sand, further improving the practicality of the present invention; when the present invention adopts the electric movement mode, it can be judged whether it is necessary to connect the first roller shaft 230 and the rolling wheel 240 according to the actual working needs. When the present invention does not need to move and only needs to perform the work of crushing caked sand, the U-shaped pin can be taken out from the square holes of the first roller shaft 230 and the rolling wheel 240, so as to disconnect the connection between the first roller shaft 230 and the rolling wheel 240, and then directly drive the first roller shaft 240 to rotate by using the driving motor 250.

[0035] As a further solution of this embodiment: both the first pipeline 120 and the second pipeline 130 are made of metal materials. Both the first pipeline 120 and the second pipeline 130 are provided with spring assemblies 300. The spring assemblies 300 can not only relieve the impact received by the first carrier box 100 during the movement process, but also cooperate with the filter screen 111 to improve the filtering efficiency of the uncaked sand in the second carrier box 110; the first pipeline 120 includes a first upper pipeline 121 and a first lower pipeline 122, and the first upper pipeline 121 is connected to the first lower pipeline 122 through the spring assembly 300; the second pipeline 130 includes a second upper pipeline 131 and a second lower pipeline 132, and the second upper pipeline 131 is connected to the second lower pipeline 132 through the spring assembly 300; the spring assembly 300 includes a damping rod 310, a damping cylinder 320 and a damping spring 330; one end of the damping rod 310 is connected to the inner surface of the first lower pipeline 122 or the second lower pipeline 132, and the other end is connected to the damping spring 330. The end of the damping spring 330 away from the damping rod 310 is connected to the inner surface of the first upper pipeline 121 or the second upper pipeline 131. The damping cylinder 320 is sleeved outside the damping spring 330 and is in sliding contact with the damping rod 310. The damping rod 310 is fixed to the inner surface of the first upper pipeline 121 or the second upper pipeline 131.

[0036] Furthermore, the first pipeline 120 and the second pipeline 130 can adopt metal materials with good damping performance and wear resistance, such as ductile iron.

[0037] As the sand in the second carrying box 110 increases, the weight of the second carrying box 110 increases gradually, the shock absorbing rod gradually extends from the shock absorbing cylinder 320, and the shock absorbing spring 330 is gradually stretched, but does not reach the limit stretching state of the spring; afterwards, when the operator pushes the present invention to move, the spring can shake during the movement, so that the second carrying box 110 shakes during the movement, and the shaking of the second carrying box 110 and the filtering of the filter 111 improve the filtering efficiency of the filter 111 for sand; at the same time, the spring can absorb part of the vibration, thereby reducing the impact on the second carrying box 110 during the movement. Through the above arrangement, the present invention not only uses the shock absorbing spring 330 to absorb the vibration impact during the movement, reducing the damage to the components of the present invention, but also uses the shock absorbing spring 330 to release the absorbed vibration energy, which will aggravate the shaking of the second carrying box 110, thereby facilitating the filtering of the sand by the filter 111.

[0038] As a further solution of this embodiment: the first upper pipeline 121 is in a right-angle shape, and the first upper pipeline 121 includes a horizontal pipe and a vertical pipe. The horizontal pipe is sleeved on the outside of the second pipeline 130, and the vertical pipe is connected to the second lower pipeline 132 through the spring assembly 300. The first pipeline 120, the second pipeline 130 and the crushing box 210 form a rectangle.

[0039] Furthermore, the second upper pipe 131 is also in a right-angle shape.

[0040] Through the above-mentioned arrangement, on the one hand, the space occupied by the first pipeline 120 and the second pipeline 130 can be effectively reduced to avoid them being too redundant; on the other hand, the supporting effect of the first pipeline 120 and the second pipeline 130 on the first carrying box 100 can be reasonably utilized, that is, the first pipeline 120 and the second pipeline 130 can be used for both the flow of sand and the support of the first carrying box 100; and the first pipeline 120, the second pipeline 130 and the crushing box 210 form a rectangle, and the formed rectangle can stably support the first carrying box 100.

Claims

1. A dust-free sand adding device for multiple unit trains, comprising a first carrying box (100), characterized in that: A second carrier box (110) is provided inside the first carrier box (100), and the second carrier box (110) is used to carry sand; a first pipeline (120) is connected to the first carrier box (100), and one end of the first pipeline (120) away from the first carrier box (100) is connected to a mobile crushing assembly, and the mobile crushing assembly is further connected to a second pipeline (130), and one end of the second pipeline (130) away from the mobile crushing assembly is connected to the second carrier box (110).

2. The dust-free sand adding device for multiple unit trains according to claim 1, wherein: A filter screen (111) is provided at the bottom of the second carrier box (110), and the filter screen (111) can filter the sand in the second carrier box (110) into the first carrier box (100); both the first pipeline (120) and the second pipeline (130) are made of metal materials, and spring assemblies (300) are provided on both the first pipeline (120) and the second pipeline (130). The spring assemblies (300) can not only relieve the impact on the first carrier box (100) during movement, but also cooperate with the filter screen (111) to improve the filtering efficiency of the unclumped sand in the second carrier box (110).

3. The dust-free sand adding device for multiple unit trains according to claim 2, characterized in that: The mobile crushing assembly includes a crushing box (210), a crushing wheel (220), a rolling wheel (230), and a first roller shaft (240); one side of the crushing box (210) is connected to the first pipeline (120), and the other side is connected to the second pipeline (130); the first roller shaft (240) vertically passes through the left and right sides of the crushing box (210) and is rotatably connected to the left and right sides of the crushing box (210). Both ends of the first roller shaft (240) are connected to the rolling wheels (230), and an intermediate part between the two end faces of the first roller shaft (240) is fixedly connected to a plurality of the crushing wheels (220). The crushing wheels (220) are located inside the crushing box (210), and the crushing wheels (220) are used to crush the clumped sand in the crushing box (210).

4. The dust-free sand adding device for multiple unit trains according to claim 3, characterized in that: The mobile crushing assembly further includes a driving motor (250), a second roller shaft (260), and a transmission component (270); the arrangement of the second roller shaft (260) is the same as that of the first roller shaft (240), and the second roller shaft (260) is arranged in an intersecting manner with the first roller shaft (240). The second roller shaft (260) is connected to the first roller shaft (240) through the transmission component (270), and the transmission component (270) can realize the synchronous movement of the first roller shaft (240) and the second roller shaft (260); the second roller shaft (260) is detachably connected to the rolling wheel (230); the first roller shaft (240) is connected to the output shaft of the driving motor (250).

5. The dust-free sand adding device for multiple unit trains according to claim 3, characterized in that: The first pipeline (120) includes a first upper pipeline (121) and the first lower pipeline (122), and the first upper pipeline (121) is connected to the first lower pipeline (122) through the spring assembly (300); the second pipeline (130) includes a second upper pipeline (131) and the second lower pipeline (132), and the second upper pipeline (131) is connected to the second lower pipeline (132) through the spring assembly (300); the spring assembly (300) includes a shock-absorbing rod (310), a shock-absorbing cylinder (320) and a shock-absorbing spring (330); one end of the shock-absorbing rod (310) is connected to the inner surface of the first lower pipeline (122) or the second lower pipeline (132), the other end is connected to the shock-absorbing spring (330), the end of the shock-absorbing spring (330) away from the shock-absorbing rod (310) is connected to the inner surface of the first upper pipeline (121) or the second upper pipeline (131), the shock-absorbing cylinder (320) is sleeved outside the shock-absorbing spring (330) and is in sliding contact with the shock-absorbing rod (310), and the shock-absorbing rod (310) is fixed to the inner surface of the first upper pipeline (121) or the second upper pipeline (131).

6. The dust-free sand adding device for EMU according to claim 5, wherein: The first upper pipeline (121) is in a right-angled shape. The first upper pipeline (121) includes a horizontal pipe and a vertical pipe. The horizontal pipe is sleeved outside the second pipeline (130), and the vertical pipe is connected to the second lower pipeline (132) through the spring assembly (300). The first pipeline (120), the second pipeline (130) and the crushing box (210) form a rectangle.

7. The dust-free sand adding device for multiple unit trains according to claim 1, wherein: The bottom of the first carrier box (100) is in a frustum shape. The hose (141) component (140) includes a hose (141) and a dust cover (142). One end of the hose (141) communicates with the bottom of the first carrier box (100), and the other end communicates with the dust cover (142). The dust cover (142) can completely cover the opening of the sand box of the EMU.

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