Bottom door opening and closing mechanism

Abstract

The application provides a bottom door opening and closing mechanism, which comprises a bottom door, a main shaft, a connecting rod assembly for connecting the bottom door and the main shaft, the main shaft can rotate under external force and drive the connecting rod assembly to open and close the bottom door; a bearing seat is sleeved on the main shaft, the bearing seat can be connected with a vehicle body where the bottom door is located, a shaft shoulder is formed on the main shaft, and a safety lock is arranged between the bearing seat and the shaft shoulder, the safety lock comprises a first elastic member sleeved on the main shaft, and the two ends of the first elastic member abut against and press the bearing seat and the shaft shoulder respectively. The beneficial effects of the application include: the safety lock is arranged on the main shaft, so that the self-locking stability of the railway wagon bottom door is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of railway vehicle parts, in particular to a bottom door opening and closing mechanism suitable for railway wagons. BACKGROUND

[0002] In order to save unloading time and improve unloading efficiency, railway wagons equipped with bottom door opening and closing mechanisms have been widely used. As a key part of the vehicle, the bottom door opening and closing mechanism is mainly arranged at the bottom of the railway wagon. During the running of the vehicle, the bottom door bears part of the weight of the goods and at the same time, the bottom door will bear a large vibration due to the turning and jolting of the vehicle. The bottom door will further transmit this vibration to the main shaft of the bottom door opening and closing mechanism, which will cause the main shaft to move axially and / or vibrate circumferentially. With the long-term use of the vehicle, the self-locking property of the main shaft to the bottom door opening and closing mechanism may be affected, and the bottom door may be accidentally opened, which will affect the safety of the vehicle. Therefore, the self-locking reliability of the bottom door should be ensured to prevent the bottom door from being abnormally opened due to vehicle vibration and other factors.

[0003] Therefore, it is necessary to study a bottom door opening and closing mechanism suitable for railway wagons to solve the above problems or alleviate the impact of the above problems. SUMMARY

[0004] The present application provides a bottom door opening and closing mechanism, which sets a safety lock on the main shaft to improve the self-locking stability of the bottom door of the railway wagon.

[0005] The bottom door opening and closing mechanism of the present application can include a bottom door, a main shaft, a connecting rod assembly for connecting the bottom door and the main shaft, and the main shaft can rotate under the action of external force and drive the connecting rod assembly to open and close the bottom door. A bearing seat is sleeved on the main shaft, the bearing seat can be connected to the vehicle body where the bottom door is located, a shaft shoulder is formed on the main shaft, and a safety lock is arranged between the bearing seat and the shaft shoulder. The safety lock includes a first elastic member sleeved on the main shaft, and the two ends of the first elastic member abut and press the bearing seat and the shaft shoulder, respectively.

[0006] In one embodiment, the safety lock can further include a pressing piece sleeved on the main shaft and fixed circumferentially with the main shaft, one side surface of the pressing piece abuts with one end of the first elastic member, and the other side surface abuts with the side surface of the bearing seat. First grooves and first protrusions that match each other are respectively arranged on the two side surfaces of the pressing piece and the bearing seat that contact each other, and the matching of the first grooves and the first protrusions can limit the main shaft in the circumferential direction of the bearing seat.

[0007] In one embodiment, the first grooves are in V-shaped, the width of the first grooves changes along the radial direction of the main shaft, and the groove wall of the first grooves and the side surface of the pressing piece are smoothly transitioned.

[0008] In one embodiment, the fixed sleeve on the main shaft is provided with a shaft shoulder sleeve for mounting the pressing sheet, the shaft shoulder sleeve and the pressing sheet are both circular rings, the outer circumferential surface of the shaft shoulder sleeve is provided with a second protrusion, and the inner circumferential surface of the pressing sheet is provided with a second groove corresponding to the second protrusion.

[0009] In one embodiment, the safety lock further comprises a fixed stopper and an adjusting stopper which are both sleeved on the main shaft and opposite to each other, and an adjusting member for adjusting the distance between the fixed stopper and the adjusting stopper; the fixed stopper is fixed at the shaft shoulder of the main shaft, and the adjusting stopper abuts against one end of the first elastic member away from the bearing seat.

[0010] In one embodiment, the fixed stopper is provided with a plurality of circumferentially distributed threaded holes, the adjusting stopper is provided with a plurality of counterbores corresponding to the threaded holes, and the adjusting member has external threads matched with the threaded holes, and the adjusting member abuts in the counterbores of the adjusting stopper through the threaded holes.

[0011] In one embodiment, the connecting rod assembly comprises a double connecting rod and a connecting rod, the middle part of the double connecting rod is fixedly sleeved on the main shaft, and the two ends of the double connecting rod are respectively hinged with the connecting rods, and one end of the connecting rod away from the double connecting rod is hinged with the bottom door.

[0012] In one embodiment, the bottom door opening and closing mechanism further comprises a touch arm provided at the end of the main shaft, and the touch arm can drive the main shaft to rotate when the touch platform on the ground is touched and relatively moved.

[0013] In one embodiment, the main shaft is provided with the touch arm at both ends, the touch arm is provided with a roller, and the touch arm comprises an opening door touch arm and a closing door touch arm. The position of the roller of the opening door touch arm and the position of the roller of the closing door touch arm located on the same end of the main shaft are staggered in the axial direction and the circumferential direction of the main shaft.

[0014] In one embodiment, the bottom door opening and closing mechanism further comprises a second elastic member, the second elastic member is provided at the side edge of the bottom door perpendicular to the axial direction of the main shaft, and the second elastic member is used to connect with the vehicle body.

[0015] The bottom door opening and closing mechanism provided by the application has at least the following beneficial effects compared with the prior art:

[0016] The bottom door opening and closing mechanism of the present application sets a safety lock between the bearing seat and the shaft shoulder of the main shaft, so that the first elastic member of the safety lock can effectively buffer the axial force received by the main shaft, so that the axial displacement of the main shaft changes little, so as to realize the axial positioning of the main shaft, and effectively reduce the axial movement of the main shaft during vehicle operation, so as to improve the driving safety and the stability of the bottom door self-locking. BRIEF DESCRIPTION OF DRAWINGS

[0017] Hereinafter, the present application will be described in more detail based on the embodiments and with reference to the accompanying drawings.

[0018] Figure 1 is a perspective structural schematic view of the bottom door opening and closing mechanism of the embodiment of the present application;

[0019] Figure 2 is a structural connection schematic view of the safety lock of the embodiment of the present application;

[0020] Figure 3 is a perspective structural schematic view of the bearing seat of the embodiment of the present application;

[0021] Figure 4 is a perspective structural schematic view of the bearing seat corresponding to the pressing piece of Figure 3 ;

[0022] Figure 5 is a plan view of the pressing piece of Figure 4 ;

[0023] Figure 6 is a perspective structural schematic view of the shaft shoulder sleeve of the embodiment of the present application;

[0024] Figure 7 is a plan view of the shaft shoulder sleeve of Figure 6 ;

[0025] Figure 8 is a top view of the bottom door opening and closing mechanism in the closed state of the embodiment of the present application;

[0026] Figure 9 is a front view of the bottom door opening and closing mechanism in the closed state of the embodiment of the present application;

[0027] Figure 10 is a front view of the bottom door opening and closing mechanism in the open state of the embodiment of the present application.

[0028] In the drawings, the same parts use the same reference numerals. The drawings are not drawn according to the actual scale.

[0029] Reference numerals:

[0030] 1 - bottom door, 2 - main shaft, 3 - bearing seat, 4 - first elastic member, 5 - pressing piece, 6 - fixed stop piece, 7 - adjusting stop piece, 8 - adjusting member, 9 - first groove, 10 - first protrusion, 11 - shaft shoulder sleeve, 12 - second groove, 13 - second protrusion, 14 - double connecting rod, 15 - connecting rod, 16 - touch arm, 17 - roller, 18 - hanging plate, 19 - support, 20 - second elastic member, 21 - vehicle body. DETAILED DESCRIPTION

[0031] The application will be further described below with reference to the accompanying drawings.

[0032] As shown in Figure 1 , Figure 2 and Figure 8 , the bottom door opening and closing mechanism of the application can include a bottom door 1, a main shaft 2, a connecting rod assembly for connecting the bottom door 1 and the main shaft 2, and the main shaft 2 can rotate under the action of external force and drive the connecting rod assembly to open and close the bottom door 1. The main shaft 2 is sleeved with a bearing seat 3, the bearing seat 3 can connect the vehicle body 21 where the bottom door 1 is located, the main shaft 2 is formed with a shaft shoulder, and a safety lock is arranged between the bearing seat 3 and the shaft shoulder. The safety lock includes a first elastic member 4 sleeved on the main shaft 2, and the two ends of the first elastic member 4 abut and press the bearing seat 3 and the shaft shoulder, respectively.

[0033] Specifically, the bottom door opening and closing mechanism is suitable for a railway wagon, and the bottom door 1 is matched with the vehicle body 21 of the railway wagon. The bottom door opening and closing mechanism can adopt a split type structure, that is, it includes two bottom doors 1, and the connecting rod assembly can open both bottom doors 1 at the same time when unloading, which can effectively increase the width size of unloading of a single bottom door opening and closing mechanism and improve the unloading efficiency. The connecting rod assembly can receive the transmission of the main shaft 2 to realize the opening and closing of the bottom door 1. The main shaft 2 can include a first shaft segment with a large outer diameter in the middle part and second shaft segments with a small outer diameter at both ends, a shaft shoulder is formed between the first shaft segment and the second shaft segment, the first shaft segment is used to connect with the connecting rod assembly, and the second shaft segment is used to install the safety lock, the bearing seat 3, etc. The bearing seat 3 facilitates the rotational connection of the main shaft 2 with the vehicle body 21, so that the main shaft 2 can rotate along the axial direction of itself while being fixed in the radial position. The safety lock is arranged between the bearing seat 3 and the shaft shoulder of the main shaft 2, and the safety lock presses the bearing seat 3 and the shaft shoulder by the two ends of the first elastic member 4, respectively. Thus, when the bottom door opening and closing mechanism is subjected to an axial force along the axial direction of the main shaft 2, the axial force can be effectively buffered by the first elastic member 4, so that the axial displacement of the main shaft 2 changes little, the axial positioning of the main shaft 2 is realized, and the axial displacement of the main shaft 2 during vehicle operation is effectively reduced, the driving safety and the stability of the self-locking of the bottom door 1 are improved.

[0034] As shown in Figures 2 to 5As shown, in one example, the safety lock can further include a pressing piece 5 sleeved on the main shaft 2 and fixed in the circumferential direction of the main shaft 2, one side surface of the pressing piece 5 abutting against one end of the first elastic member 4, and the other side surface abutting against the side surface of the bearing seat 3. The pressing piece 5 and the bearing seat 3 are respectively provided with a first groove 9 and a first protrusion 10 matched with each other on the two side surfaces in contact with each other, and the first groove 9 and the first protrusion 10 matched with each other can limit the main shaft 2 in the circumferential direction of the bearing seat 3.

[0035] Specifically, the pressing piece 5 can facilitate the force transmission between the first elastic member 4 and the bearing seat 3, and the first groove 9 and the first protrusion 10 matched with each other on the contact surface of the pressing piece 5 and the bearing seat 3 under the extrusion of the first elastic member 4 can limit the pressing piece 5 and the bearing seat 3 in the circumferential direction, have a certain stability, and can offset the torque generated on the main shaft 2 due to vibration in the process of transporting goods, so as to realize the circumferential positioning of the main shaft 2, effectively reduce the circumferential vibration of the main shaft 2 when the vehicle runs, and improve the driving safety and the stability of the self-locking of the bottom door 1.

[0036] It should be noted that when the first groove 9 is arranged on the pressing piece 5 (as shown in FIG. 2), the first protrusion 10 is arranged on the corresponding bearing seat 3 (as shown in FIG. 3); or when the first protrusion 10 is arranged on the pressing piece 5, the first groove 9 is arranged on the corresponding bearing seat 3. Figure 4 Figure 3 The number of the first grooves 9 is the same as that of the first protrusions 10, the positions are one-to-one corresponding, and the shapes and sizes are matched. The first groove 9 and the first protrusion 10 are matched, that is, the first protrusion 10 is located in the first groove 9, and when the force between them that wants to make them rotate in the circumferential direction is large enough, the first protrusion 10 will break through the limitation of the first groove 9, so that the pressing piece 5 rotates in the circumferential direction relative to the bearing seat 3. That is, the first groove 9 and the first protrusion 10 are arranged only to offset the torque generated on the main shaft 2 due to vibration in the process of transporting goods, and will not affect the normal opening and closing of the bottom door 1. In this way, the first groove 9 and the first protrusion 10 can be made of composite materials, can deform to a certain extent, and can quickly recover, or the first protrusion 10 and the first groove 9 at the contact position of the bearing seat 3 and the pressing piece 5 can be designed to be small in size and smooth, so that the friction between them is small, and the normal opening and closing of the bottom door 1 will not be affected. Furthermore, the side surface of the pressing piece 5 abutting against the first elastic member 4 is smooth and has small friction, and the pressing piece 5 will not drive the first elastic member 4 to rotate synchronously when the pressing piece 5 rotates.

[0037] As shown in FIG. 4, the first elastic member 4 can be a spring. Figures 3 to 5 ​As shown in the figure, in one example, the first groove 9 is V-shaped, the width of the first groove 9 varies along the radial direction of the main shaft 2, and the groove wall of the first groove 9 is smoothly connected with the side surface of the pressing piece 5, and the structure of the first protrusion 10 is adaptively matched according to the first groove 9. Such arrangement is only one way of matching the first groove 9 and the first protrusion 10 to achieve the above-mentioned function, and the first groove 9 and the first protrusion 10 can also be arranged in other suitable structures according to actual conditions.

[0038] As shown in the figure, Figures 4 to 7 In one example, the shaft shoulder sleeve 11 for mounting the pressing piece 5 is fixedly sleeved on the main shaft 2, the shaft shoulder sleeve 11 and the pressing piece 5 are both circular rings, the outer circumferential surface of the shaft shoulder sleeve 11 is provided with a second protrusion 13, and the inner circumferential surface of the pressing piece 5 is provided with a second groove 12 corresponding to the second protrusion 13. In this way, the second protrusion 13 and the second groove 12 enable the pressing piece 5 to be fixed in the circumferential direction and relatively movable in the axial direction with the shaft shoulder sleeve 11, and further enable the pressing piece 5 to be fixed in the circumferential direction and relatively movable in the axial direction with the main shaft 2. It should be noted that the shaft shoulder sleeve 11 has a certain width to avoid the pressing piece 5 from being separated from the shaft shoulder sleeve 11 when the main shaft 2 and the pressing piece 5 move axially.

[0039] As shown in the figure, Figure 2 In one example, the safety lock can further include a fixed stop piece 6 and an adjusting stop piece 7 which are both sleeved on the main shaft 2 and opposite to each other, and an adjusting member 8 for adjusting the distance between the fixed stop piece 6 and the adjusting stop piece 7; the fixed stop piece 6 is fixed at the shaft shoulder of the main shaft 2, and the adjusting stop piece 7 abuts against the end of the first elastic member 4 away from the bearing seat 3.

[0040] Specifically, the fixed stop piece 6 and the adjusting stop piece 7 are beneficial to the force transmission between the first elastic member 4 and the shaft shoulder of the main shaft 2, and the safety lock adjusts the distance between the adjusting stop piece 7 and the fixed stop piece 6 through the adjusting member 8 to adjust the pressing degree of the first elastic member 4, so as to adjust the deformation degree of the first elastic member 4 under extrusion. The fixed stop piece 6 and the adjusting stop piece 7 can both be circular ring structures, and the inner ring is matched with the size of the main shaft 2. The first elastic member 4 can be a compression spring.

[0041] In one example, the fixed stop piece 6 is provided with a plurality of threaded holes distributed in the circumferential direction, the adjusting stop piece 7 is provided with a plurality of counterbores corresponding to the threaded holes, and the adjusting member 8 has external threads matched with the threaded holes, and the adjusting member 8 abuts in the counterbores of the adjusting stop piece 7 through the threaded holes. Specifically, the fixed stop piece 6 can be a flange plate, and the adjusting member 8 can be an adjusting nut. The adjusting member 8 adjusts the distance between the fixed stop piece 6 and the adjusting stop piece 7 by the length of the threaded hole, and the lengths of the plurality of adjusting members 8 passing through the fixed stop piece 6 should be consistent to prevent the adjusting stop piece 7 from tilting.

[0042] As shown in the figure, Figure 1 ,Figures 8 to 10 As shown in the figure, in one example, the linkage assembly can include a double linkage 14 and a linkage 15, the double linkage 14 is fixed in the middle of the main shaft 2, and the two ends of the double linkage 14 are respectively hinged with the linkage 15, and the end of the linkage 15 away from the double linkage 14 is hinged with the bottom door 1.

[0043] Specifically, the structure of the two ends of the double linkage 14 is centrosymmetric about its own center, and the double linkage 14 rotates together with the main shaft 2 around the axis of the main shaft 2, and the side edge of the bottom door 1 of the general bottom door opening and closing mechanism is hinged with the vehicle body 21, so that the double linkage 14 between the main shaft 2 and the vehicle body 21 and the linkage 15 and the bottom door 1 form a four-bar linkage 15 mechanism. During the closing process of the bottom door 1, the center point of the main shaft 2 will pass through the self-locking line formed by the connection point of the bottom door 1 and the linkage 15, the connection point of the linkage 15 and the double linkage 14 on a horizontal line, so that the mechanism realizes self-locking, that is, the bottom door opening and closing mechanism can break through the self-locking dead point by itself, realize self-locking, and is safe and reliable. Furthermore, the bottom door opening and closing mechanism all adopts the hinged linkage assembly, which effectively reduces the friction resistance in the opening and closing process of the bottom door 1.

[0044] As shown in the figure, Figure 1 and Figure 2 As shown in the figure, in one example, the bottom door opening and closing mechanism can also include a touch arm 16 arranged at the end of the main shaft 2, which can drive the main shaft 2 to rotate when touching the ground touch table and moving relative to it.

[0045] Specifically, the bottom door opening and closing mechanism relies on the relative movement of the touch arm 16 and the ground touch table to obtain stable motion inertia, the mechanism has good accuracy when passing through the extreme position (self-locking dead point), improves the stability of the opening and closing of the bottom door 1, and the cooperation of the bottom door opening and closing mechanism and the ground touch table can break through the self-locking dead point by itself, realize self-locking, and is safe and reliable. Such a bottom door opening and closing mechanism does not need a wind source, is high in energy saving, simple in structure, and economical.

[0046] In one example, the main shaft 2 is provided with a touch arm 16 at both ends, the touch arm 16 is provided with a roller 17, and the touch arm 16 includes an opening door touch arm and a closing door touch arm. The positions of the rollers 17 of the opening door touch arm and the closing door touch arm located on the same end of the main shaft 2 are staggered in the axial and circumferential directions of the main shaft 2. In this way, the touch arm 16 adopts a bidirectional touch arm, which can realize bidirectional unloading in cooperation with the ground touch table, unloading while walking, and can improve the unloading efficiency.

[0047] Specifically, when the vehicle runs slowly, the roller 17 on the one end of the door opening touch arm hits the door opening touch platform, and under the slope guiding effect of the door opening touch platform, the double connecting rod 14 is rotated clockwise, the bottom door opening and closing mechanism breaks through the self-locking dead point, and the bottom door 1 is opened under the gravity of the goods and starts to unload the goods until the goods are unloaded. The vehicle unloads the goods while walking, and after the goods are unloaded, the roller 17 on the door closing touch arm at the same end hits the door closing touch platform at a different position from the door opening touch platform, and under the slope guiding force of the door closing touch platform, the double connecting rod 14 is rotated counterclockwise, so that the bottom door opening and closing mechanism passes through the self-locking dead point and realizes self-locking. In this way, when the main shaft 2 at both ends is provided with the bidirectional touch arm, bidirectional unloading can be realized.

[0048] As shown in Figure 1 and 9 , in one example, the bottom door opening and closing mechanism can further include a second elastic member 20, the second elastic member 20 is arranged on the side of the bottom door 1 which is perpendicular to the axial direction of the main shaft 2, and the second elastic member 20 is used to be connected with the vehicle body 21. The bottom door opening and closing mechanism increases the second elastic member 20 on the bottom door 1, and the self-locking ability of the bottom door 1 is increased through the pressure of the second elastic member 20, so as to improve the reliability of the self-locking of the bottom door 1. The second elastic member 20 can adopt a compression spring.

[0049] It also needs to be explained that, as shown in Figure 1 , Figures 8 to 10 , the bottom door opening and closing mechanism can further include a hanging plate 18, one end of the hanging plate 18 is connected with the bearing seat 3, and the other end is used to be connected with the vehicle body 21. The hanging plate 18 is used to fix the bearing seat 3 and the vehicle body 21, so that the bottom door opening and closing mechanism is stably installed at the bottom of the vehicle body 21, and provides support for the opening and closing action of the bottom door opening and closing mechanism. The bottom door opening and closing mechanism can further include a support 19, one end of the support 19 is hinged to the side of the bottom door 1 close to the main shaft 2, and the other end is used to be connected with the vehicle body 21. The support 19 is used to form a hinge between the side of the bottom door 1 and the vehicle body 21, which can provide a key hinge point for the bottom door opening and closing mechanism, facilitate the formation of the four connecting rod 15 mechanism, and prevent the bottom door 1 from falling when the bottom door 1 is opened.

[0050] In summary, the present application can effectively reduce the vibration of the main shaft of the bottom door opening and closing mechanism when the vehicle runs, improve the driving safety and the stability of the bottom door self-locking. The present application does not need a wind source, is high in energy saving, simple in structure and economy, simple in production and manufacturing, easy in installation and debugging, fast in unloading efficiency, convenient in operation, safe and reliable, and can well adapt to the existing railway freight cars.

[0051] While the present application has been described with reference to the preferred embodiments, it is to be understood that various modifications can change the scope of the present application to which they are not intended to deviate. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided that there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A bottom door opening and closing mechanism characterized by comprising: The bottom door opening and closing mechanism comprises a bottom door, a main shaft, a connecting rod assembly for connecting the bottom door and the main shaft, and the main shaft can rotate under external force and drive the connecting rod assembly to open and close the bottom door. A bearing seat is sleeved on the main shaft, the bearing seat can be connected with the vehicle body where the bottom door is located, a shaft shoulder is formed on the main shaft, a safety lock is arranged between the bearing seat and the shaft shoulder, the safety lock comprises a first elastic member sleeved on the main shaft, and two ends of the first elastic member abut against and press the bearing seat and the shaft shoulder respectively. The safety lock further comprises a pressing piece sleeved on the main shaft and fixed in the circumferential direction of the main shaft, one side surface of the pressing piece abuts against one end of the first elastic member, and the other side surface of the pressing piece abuts against the side surface of the bearing seat, first grooves and first protrusions matched with each other are respectively arranged on the two side surfaces of the pressing piece and the bearing seat which contact with each other, and the first grooves and the first protrusions are matched to limit the main shaft in the circumferential direction of the bearing seat. The first grooves are V-shaped, the width of the first grooves changes along the radial direction of the main shaft, the groove wall of the first grooves and the side surface of the pressing piece are smoothly connected, and the structure of the first protrusions is adaptively matched with the first grooves.

2. The bottom door opening and closing mechanism according to claim 1, characterized by A shaft shoulder sleeve for mounting the pressing piece is fixedly sleeved on the main shaft, the shaft shoulder sleeve and the pressing piece are both annular, a second protrusion is arranged on the outer circumferential surface of the shaft shoulder sleeve, and a second groove corresponding to the second protrusion is arranged on the inner circumferential surface of the pressing piece.

3. The bottom door opening and closing mechanism according to claim 1, characterized by The safety lock further comprises a fixed stop piece and an adjusting stop piece which are both sleeved on the main shaft and opposite to each other, and an adjusting member for adjusting the distance between the fixed stop piece and the adjusting stop piece; the fixed stop piece is fixed at the shaft shoulder of the main shaft, and the adjusting stop piece abuts against one end of the first elastic member away from the bearing seat.

4. The bottom door opening and closing mechanism according to claim 3, characterized in that, A plurality of thread holes distributed in the circumferential direction are arranged on the fixed stop piece, a plurality of counterbores corresponding to the thread holes are arranged on the adjusting stop piece, the adjusting member has external threads matched with the thread holes, and the adjusting member is abutted in the counterbores of the adjusting stop piece through the thread holes.

5. The bottom door opening and closing mechanism according to claim 1, characterized in that, The connecting rod assembly comprises a double connecting rod and a connecting rod, the middle part of the double connecting rod is fixedly sleeved on the main shaft, two ends of the double connecting rod are respectively hinged with the connecting rods, and one end of the connecting rod away from the double connecting rod is hinged with the bottom door.

6. The bottom door opening and closing mechanism according to claim 1, characterized by The bottom door opening and closing mechanism further comprises a touch arm arranged at the end of the main shaft, and the touch arm can drive the main shaft to rotate when the touch arm touches the touch table of the ground and moves relatively.

7. The bottom door opening and closing mechanism according to claim 6, characterized in that, The touch arms are arranged at both ends of the main shaft, the touch arms have rollers, and the touch arms comprise an opening door touch arm and a closing door touch arm. The positions of the rollers of the opening door touch arm and the closing door touch arm located on the same end of the main shaft are staggered in the axial direction and the circumferential direction of the main shaft.

8. The bottom door opening and closing mechanism according to any one of claims 1 to 7, characterized in that, The bottom door opening and closing mechanism further comprises a second elastic member, the second elastic member is arranged on the side edge of the bottom door perpendicular to the axial direction of the main shaft, and the second elastic member is used for connecting with the vehicle body.

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