Mine flat car coupling device

Abstract

The application discloses a mine flat car connecting device, which comprises a first connecting head, a second connecting head and a connecting piece. The first connecting head comprises a first connecting part and a second connecting part used for being rotatably connected with the mine flat car. The second connecting head comprises a third connecting part and a fourth connecting part used for being rotatably connected with the mine flat car. The first connecting part and the third connecting part are rotatably connected with the connecting piece. The mine flat car connecting device is used for connecting two adjacent flat cars. When the track has a large angle and a small arc at a slope change point or has a large angle and a small turning radius at a horizontal turning point, the connecting device can smoothly pass through the track, and the connecting device does not need to bear a large load force, so that the service life of the connecting device can be prolonged.

Description

Technical Field

[0001] This invention relates to the technical field of coal mine transportation equipment, and specifically to a connecting device for mining flatbed trucks. Background Technology

[0002] Mining flatbed cars have the advantages of large load capacity and large carrying volume, making them an important transportation equipment in coal mine rail auxiliary transportation systems. Currently, most mining flatbed cars use rigid connections such as connecting plates or connecting rods. These connections cannot pass through tracks with large angles or small curvatures at slope changes or large angles or small turning radii at horizontal turns. Furthermore, long-term use of rigid connections causes significant damage to the connecting structure, making it prone to breakage and deformation, thus affecting coal mine production efficiency. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose a mining flatbed car connecting device, which is suitable for connecting two adjacent flatbed cars, enabling the flatbed cars to smoothly pass through tracks with large slope angles and small arcs at gradient points or large angles and small turning radii at horizontal turns. At the same time, the connecting device does not need to bear a large load force, which can improve the service life of the connecting device, thereby improving the coal mine production efficiency.

[0005] The mining flatbed car connecting device of this invention is suitable for connecting two adjacent mining flatbed cars. The mining flatbed car connecting device includes a first connector, a second connector, and a connector. The first connector includes a first connecting portion and a second connecting portion for rotatably connecting to the mining flatbed car. The second connector includes a third connecting portion and a fourth connecting portion for rotatably connecting to the mining flatbed car. Both the first connecting portion and the third connecting portion are rotatably connected to the connector. The rotation axis of the first connecting portion relative to the connector is perpendicular to the rotation axis of the second connecting portion relative to the mining flatbed car, and the rotation axis of the third connecting portion relative to the connector is perpendicular to the rotation axis of the fourth connecting portion relative to the mining flatbed car.

[0006] In some embodiments, a shaft assembly is further included, wherein at least one of the first connecting portion and the third connecting portion is rotatably connected to the connector via the shaft assembly.

[0007] In some embodiments, the shaft assembly includes a rotating shaft, a first blocking portion and a second blocking portion, wherein the first blocking portion and the second blocking portion are respectively arranged at both ends of the rotating shaft and are both connected to the rotating shaft.

[0008] In some embodiments, the rotating shaft includes a shaft segment and a connecting segment, a first blocking portion is connected to the shaft segment, a second blocking portion is movably connected to the connecting segment, and a stepped surface is formed between the shaft segment and the connecting segment, which is arranged toward the second blocking portion;

[0009] The shaft assembly also includes a stop member, which is threadedly connected to the connecting section to drive the second blocking portion against the stepped surface.

[0010] In some embodiments, the shaft assembly further includes a locking pin, the stop member having a plurality of locking grooves arranged circumferentially along the shaft, the connecting section having a locking hole, and the locking pin passing through the locking grooves and the locking hole when the locking grooves are aligned with the locking hole.

[0011] In some embodiments, the connector includes a first connecting plate, a second connecting plate, and a sliding rod. The first connecting plate and the second connecting plate are slidably connected to the sliding rod. The first connecting plate is connected to the first connecting portion, and the second connecting plate is connected to the third connecting portion.

[0012] In some embodiments, the slide member includes a slide rod and a slide seat, the slide seat being connected to the slide rod; at least one of the first connecting plate and the second connecting plate has a cavity for containing gas, the slide seat being slidably disposed in the cavity and dividing the cavity into a first gas cavity and a second gas cavity.

[0013] In some embodiments, the slide rod is disposed on the side of the slide block near the second air chamber, and a flow-damping plate is provided in the second air chamber. The flow-damping plate is fixedly connected to the side wall of the second air chamber, and the flow-damping plate divides the second air chamber into a first buffer chamber and a second buffer chamber. The flow-damping plate has a plurality of buffer holes that connect the first buffer chamber and the second buffer chamber.

[0014] In some embodiments, a pressure monitor is provided inside the second buffer chamber.

[0015] In some embodiments, the first buffer cavity is provided with an elastic member, the elastic member having two relatively extendable ends, the two ends of the elastic member respectively abutting against the slide and the flow damper.

[0016] In this embodiment of the mining flatcar connecting device, when connecting two adjacent mining flatcars, the second connecting part and the fourth connecting part are rotatably connected to the two adjacent mining flatcars respectively. Since the first connecting part and the third connecting part can be rotatably connected to the connecting member, the two adjacent flatcars can move relative to each other in both horizontal and vertical directions. When the flatcar passes through a track with a large gradient angle and small arc, or a large horizontal turning angle and small turning radius, the two adjacent flatcars can move relative to each other to adjust their relative positions, allowing the flatcars to pass smoothly through that section of track. At the same time, the connecting device does not need to bear a large load, which can improve the service life of the connecting device and thus improve the coal mine production efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a mining flatbed truck connection device according to an embodiment of the present invention.

[0018] Figure 2 This is an exploded structural diagram of the shaft assembly of a mining flatbed truck connecting device according to an embodiment of the present invention.

[0019] Figure 3 This is a cross-sectional view of the connector of the mining flatbed truck connecting device according to another embodiment of the present invention.

[0020] Figure 4 This is a three-dimensional structural schematic diagram of the connector of the mining flatbed truck connecting device according to another embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the flow-delay plate of a mining flatbed truck connecting device according to another embodiment of the present invention.

[0022] Figure label:

[0023] 100. Connecting device;

[0024] 1. First connector; 11. First connecting part; 12. Second connecting part;

[0025] 2. Second connector; 21. Third connector; 22. Fourth connector;

[0026] 3. Connecting component; 31. First connecting plate; 32. Second connecting plate; 33. Sliding rod component; 331. Sliding rod; 332. Sliding seat; 34. First air chamber; 35. Second air chamber; 351. First buffer chamber; 352. Second buffer chamber; 36. Flow retardant plate; 361. Flow retardant hole; 37. Elastic component;

[0027] 4. Shaft assembly; 41. Rotating shaft; 411. Shaft segment; 412. Connecting segment; 4121. Locking hole; 413. Stepped surface; 42. First blocking part; 43. Second blocking part; 44. Stopping part; 441. Locking groove; 45. Pull ring;

[0028] 5. Pressure monitor. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] like Figure 1 and Figure 2 As shown, the mining flatbed car connecting device 100 of this embodiment is suitable for connecting two adjacent mining flatbed cars. The mining flatbed car connecting device 100 includes a first connector 1, a second connector 2, and a connector 3. The first connector 1 includes a first connecting portion 11 and a second connecting portion 12 for rotatably connecting to the mining flatbed car. The second connector 2 includes a third connecting portion 21 and a fourth connecting portion 22 for rotatably connecting to the mining flatbed car. Both the first connecting portion 11 and the third connecting portion 21 are rotatably connected to the connector 3. The rotation axis of the first connecting portion 11 relative to the connector 3 is perpendicular to the rotation axis of the second connecting portion 12 relative to the mining flatbed car. The rotation axis of the third connecting portion 21 relative to the connector 3 is perpendicular to the rotation axis of the fourth connecting portion 22 relative to the mining flatbed car.

[0031] In this embodiment of the invention, the mining flatbed car connecting device 100 connects two adjacent mining flatbed cars. The second connecting part 12 and the fourth connecting part 22 are rotatably connected to the two adjacent mining flatbed cars respectively. Since the first connecting part 11 and the third connecting part 21 are rotatably connected to the connecting member 3, the two adjacent flatbed cars can move relative to each other in both horizontal and vertical directions. When the flatbed car passes through a track with a large gradient angle and small arc, or a large horizontal turning angle and small turning radius, the two adjacent flatbed cars can move relative to each other to adjust their relative positions, allowing the flatbed car to pass smoothly through that section of track. Simultaneously, the connecting device 100 does not need to bear a large load, which can improve the service life of the connecting device 100, thereby improving coal mine production efficiency.

[0032] As an example, such as Figure 1 As shown, both the first connector 1 and the second connector 2 are cross connectors, and both are forged from 27SiMn material to ensure that the cross connectors have sufficient connection strength.

[0033] The cross connector includes an integrally formed single lug plate and double lug plate. The double lug plate of the first connector 1 forms a first connecting part 11, the single lug plate of the second connector 2 forms a second connecting part 12, the double lug plate of the second connector 2 forms a third connecting part 21, and the single lug plate of the second connector 2 forms a fourth connecting part 22.

[0034] The flatbed car has double lugs (not shown in the figure). The second connecting part 12 and the fourth connecting part 22 are rotatably connected to the double lugs of the two flatbed cars respectively. The rotation axis of the second connecting part 12 relative to the flatbed car and the rotation axis of the fourth connecting part 22 relative to the flatbed car are parallel to each other and both extend horizontally, so that the two adjacent flatbed cars can move relative to each other vertically, so that the mining flatbed car can pass through the track with a large slope angle and small arc at the change point.

[0035] The connector 3 is a long strip plate forged from 27SiMn material to ensure sufficient connection strength. Both ends of the connector 3 are rotatably connected to the first connecting part 11 and the third connecting part 21, respectively. The rotation axis of the first connecting part 11 relative to the connector 3 and the rotation axis of the third connecting part 21 relative to the connector 3 are parallel to each other and both extend vertically, allowing adjacent flatcars to move relative to each other in the horizontal direction. This enables the mining flatcar to pass through tracks with large horizontal turning angles and small turning radii.

[0036] Optionally, such as Figure 1 and Figure 2 As shown, the second connecting part 12 and the fourth connecting part 22 are both rounded near the sides of the two flatbeds.

[0037] Therefore, the second connecting part 12 and the fourth connecting part 22 can rotate ±90° relative to the two flatbeds respectively, allowing the two adjacent flatbeds to move freely in the vertical direction.

[0038] Optionally, such as Figure 1 and Figure 2 As shown, both ends of connector 3 are rounded.

[0039] Therefore, the connector 3 can rotate ±90° relative to both the first connecting part 11 and the third connecting part 21 in the horizontal direction, allowing the two adjacent flatbed cars to move freely in the horizontal direction, thereby ensuring the degree of freedom of movement of the connecting device 100.

[0040] In some embodiments, such as Figure 1 and Figure 2 As shown, the mining flatbed truck connecting device 100 also includes a shaft assembly 4, and at least one of the first connecting part 11 and the third connecting part 21 is rotatably connected to the connecting member 3 through the shaft assembly 4.

[0041] The first connecting part 11 and the third connecting part 21 are rotatably connected to the connecting piece 3 through the shaft assembly 4. The structure is simple and the installation process is relatively easy.

[0042] Optionally, both the first connecting part 11 and the third connecting part 21 are rotatably connected to the connecting member 3 via the shaft assembly 4.

[0043] Optionally, the second connecting part 12 and the fourth connecting part 22 are rotatably connected to two adjacent flatbed cars via shaft assemblies 4.

[0044] As an example, such as Figure 1 and Figure 2 As shown, both the first connecting part 11 and the third connecting part 21 have a first ear hole, and both ends of the connector 3 have a second ear hole. The two ends of the connector 3 are respectively inserted between the double ear plates of the first connecting part 11 and the third connecting part 21. The second ear holes at both ends of the connector 3 are aligned with the first ear holes of the first connecting part 11 and the third connecting part 21, and then the shaft assembly 4 is passed through, so that the connector 3 can be rotatably connected to the first connecting part 11 and the third connecting part 21.

[0045] In some embodiments, the shaft assembly 4 includes a rotating shaft 41, a first blocking portion 42 and a second blocking portion 43, wherein the first blocking portion 42 and the second blocking portion 43 are respectively arranged at both ends of the rotating shaft 41 and are both connected to the rotating shaft 41.

[0046] By setting the first blocking part 42 and the second blocking part 43, when the rotating shaft 41 is subjected to axial force, the first blocking part 42 and the second blocking part 43 can provide a reverse force to block it, preventing the rotating shaft 41 from disengaging, thereby ensuring the stability of the connection between the first connecting part 11 and the third connecting part 21 and the connecting member 3, and realizing the safe and efficient operation of the mining flatbed truck.

[0047] Optionally, the shaft 41 is made of 30CrMnTi material after quenching and tempering and then machined, which not only has sufficient strength but also ensures a certain degree of toughness.

[0048] In some embodiments, the shaft 41 includes a shaft segment 411 and a connecting segment 412, a first blocking portion 42 is connected to the shaft segment 411, and a second blocking portion 43 is movably connected to the connecting segment 412. A stepped surface 413 is formed between the shaft segment 411 and the connecting segment 412 and is arranged toward the second blocking portion 43. The shaft assembly 4 also includes a stop member 44, which is threadedly connected to the connecting segment 412 so as to drive the second blocking portion 43 to abut against the stepped surface 413.

[0049] When connecting the connector 3 and the first connecting part 11 (or the third connecting part 21) through the shaft assembly 4, the rotating shaft 41 is passed through the first ear hole and the second ear hole of the connector 3 in sequence. The first blocking part 42 is located on one side. Then, the second blocking part 43 and the stop member 44 are connected to the connecting part in sequence. By screwing the stop member 44, the stop member 44 stops against the second blocking part 43, and the second blocking part 43 stops against the step surface 413. A space can be left between the first blocking part 42 and the second blocking part 43 to accommodate the connector 3 and the first connecting part 11 (or the third connecting part 21), preventing the first blocking part 42 and the second blocking part 43 from being tightly attached to the connector 3 or the first connecting part 11, which would affect the free rotation between the two, thereby ensuring the free rotation of the connector 3 with the first connecting part 11 and the third connecting part 21.

[0050] In addition, the stop member 44 can lock the second blocking part 43 to prevent the second blocking part 43 from disengaging from the rotating shaft 41, thereby preventing the rotating shaft 41 from falling off, thereby improving the stability of the connection between the first connecting part 11 and the third connecting part 21 and the connecting member 3, ensuring the safety of the universal connection device, and realizing the safe and efficient operation of the mining flatbed truck.

[0051] Optionally, such as Figure 2 As shown, the stop part 44 is a nut.

[0052] Therefore, when the shaft 41 is subjected to axial force, the nut can provide a reverse force to block it, so that the second stop part always stops against the stepped surface 413.

[0053] Optionally, such as Figure 1 As shown, the shaft assembly also includes a pull ring 45, which is welded to the first blocking part.

[0054] This makes it easier for operators to handle the rotating shaft 41, which in turn facilitates the installation of the connecting device 100.

[0055] In some embodiments, such as Figure 2 As shown, the shaft assembly 4 also includes a locking pin (not shown in the figure), the stop member 44 has a plurality of locking grooves 441 arranged circumferentially along the shaft 41, the connecting section 412 has a locking hole 4121, and when the locking groove 441 is aligned with the locking hole 4121, the locking pin passes through the locking groove 441 and the locking hole 4121.

[0056] The locking pin can lock the stop member 44 to prevent it from disengaging after rotating relative to the rotating shaft 41, and further prevent the rotating shaft 41 from falling off, thus playing a double anti-disengagement role and further improving the safety of the connecting device 100.

[0057] As an example, such as Figure 2As shown, the diameter of the connecting section 412 is smaller than the diameter of the shaft section 411, and the end face of the shaft section 411 facing the connecting section 412 forms the aforementioned stepped surface 413; the connecting section 412 has external threads, the second blocking part 43 is a washer, the stop member 44 is a slotted nut, the multiple slots of the slotted nut form the aforementioned locking groove 441, and the locking pin is a cotter pin (not shown in the figure).

[0058] When the connector 3 is connected to the first connecting part 11, the rotating shaft 41 is passed through the first connecting part 11 and the connector 3, the washer is fitted onto the connecting section 412, the slotted nut is threaded into the connecting section 412, and the slotted nut is abutted against the washer. Then, the slotted nut is screwed so that the locking groove 441 at any position is aligned with the locking hole 4121, and the cotter pin is passed through the locking groove 441 and the locking hole 4121 in sequence, thereby achieving a stable connection between the connector 3 and the first connecting part 11.

[0059] Similarly, the connector 3 and the third connecting part 21 can also be securely connected by the shaft assembly 4.

[0060] In some embodiments, such as Figure 3 As shown, the connector 3 includes a first connecting plate 31, a second connecting plate 32, and a sliding rod 33. Both the first connecting plate 31 and the second connecting plate 32 are slidably connected to the sliding rod 33. The first connecting plate 31 is connected to the first connecting part 11, and the second connecting plate 32 is connected to the third connecting part 21.

[0061] It is known that, due to the complex transportation environment in coal mines, when obstacles such as coal blocks or stones fall onto the track, the front flatbed car (referring to the flatbed car located in front of the obstacle) continues to move, while the rear flatbed car (referring to the flatbed car located behind the obstacle) is blocked by the obstacle. Under the traction of the front flatbed car, the rear flatbed car passes over the obstacle at a relatively fast speed, resulting in a large forward impact force on the rear flatbed car. This, in turn, causes the connecting device 100 to be subjected to a large impact force, making the connecting device 100 prone to damage.

[0062] With the above settings, the distance between two adjacent flatbed sections can be adjusted when the first connecting plate 31 or the second connecting plate 32 slides relative to the slide bar 331. When a flatbed encounters an obstacle, the connecting device 100 extends under the traction force of the front flatbed, which reduces the traction force on the rear flatbed, thereby reducing the speed at which the rear flatbed crosses the obstacle and providing a buffer for the rear flatbed. This reduces the impact force on the connecting device 100 and improves its service life.

[0063] In some embodiments, such as Figure 3 and Figure 4As shown, the slide member 33 includes a slide rod 331 and a slide seat 332, with the slide seat 332 connected to the slide rod 331; at least one of the first connecting plate 31 and the second connecting plate 32 has a cavity for containing gas, and the slide seat 332 is slidably disposed in the cavity, dividing the cavity into a first gas cavity 34 and a second gas cavity 35.

[0064] With the above configuration, the first air chamber 34 and the second air chamber 35 are filled with gas. When the flatbed truck encounters an obstacle, the rear flatbed truck is blocked. Under the traction of the front flatbed truck, the slide bar 331 drives the slide seat 332 to move, thereby changing the volume of the first air chamber 34 and the second air chamber 35, so that the gas is compressed. The compressed gas generates a reaction force on the slide seat 332, which can buffer the sliding of the slide seat 332, thereby reducing the impact force of the rear flatbed truck crossing the obstacle.

[0065] Optionally, both the first connecting plate 31 and the second connecting plate 32 have the aforementioned cavity, and there are two slide blocks 332. The two slide blocks 332 are slidably fitted in the two cavities respectively, and the slide rod 331 passes through the cavity walls of the two cavities. The two ends of the slide rod 331 are connected to the two slide blocks 332 respectively. When the flatbed is moving normally, the first connecting plate 31 and the second connecting plate 32 are in contact with each other.

[0066] Therefore, regardless of whether multiple flatbed cars are transported in the forward or reverse direction along the track, the gas inside the cavity can act as a buffer.

[0067] In some embodiments, such as Figure 3 and Figure 4 As shown, the slide bar 331 is located on the side of the slide block 332 near the second air chamber 35. The second air chamber 35 is provided with a flow buffer plate 36, which is fixedly connected to the side wall of the second air chamber 35. The flow buffer plate 36 divides the second air chamber 35 into a first buffer chamber 351 and a second buffer chamber 352. The flow buffer plate 36 has multiple buffer holes that connect the first buffer chamber 351 and the second buffer chamber 352.

[0068] With the above settings, when the flatbed truck encounters an obstacle, the rear flatbed truck is blocked, and the front flatbed truck pulls the slide bar 331 forward, which can drive the slide block 332 to compress the second air chamber 35. The gas in the first buffer chamber 351 enters the second buffer chamber 352 through the buffer hole. The buffer hole can further buffer the sliding of the slide block 332, thereby reducing the impact force of the rear flatbed truck crossing the obstacle.

[0069] Optionally, such as Figure 5 As shown, the cross-section of the buffer hole is circular and extends through the flow buffer 36, and the center line of the buffer hole is a spiral.

[0070] As a result, the gas flows along the spiral path of the buffer hole, and the gas flow path increases. At the same time, the airflow is guided by the wall of the buffer hole, forming a rotating or spiral airflow, which can reduce the impact force of the airflow and thus buffer the airflow, reduce the sliding speed of the slide block 332, and thus reduce the impact force generated when the rear flatbed car crosses the obstacle.

[0071] In some embodiments, a pressure monitor 5 is provided in the second buffer chamber 352.

[0072] The pressure monitor 5 can monitor the gas pressure in the second buffer chamber 352. When the obstacle on the track is too large to pass, the rear flatbed is blocked by the obstacle, the distance between the first connecting plate 31 and the second connecting plate 32 gradually increases, and the slide 332 continues to move towards the second air chamber 35, which increases the air pressure in the first buffer chamber 351 and the second buffer chamber 352. When the air pressure in the second buffer chamber 352 reaches a certain value, it can remind the staff that the flatbed has malfunctioned, so that the obstacle on the track can be checked in time.

[0073] Optionally, the pressure monitor 5 mentioned above is equipped with an alarm.

[0074] Therefore, when the air pressure in the second buffer chamber 352 reaches a certain value, the alarm can be activated to promptly remind staff to check for obstacles.

[0075] In some embodiments, such as Figure 3 and Figure 4 As shown, an elastic member 37 is provided between the slide block 332 and the flow buffer 36. The elastic member 37 has two ends that can extend and retract relative to each other. The two ends of the elastic member 37 abut against the slide block 332 and the flow buffer 36 respectively.

[0076] By setting the elastic element 37, multi-level buffering of the slide 332 can be achieved, resulting in a better buffering effect.

[0077] As an example, such as Figure 4 As shown, there are multiple elastic elements 37 between the slide 332 and the flow deflector 36, and the multiple elastic elements 37 are arranged at intervals; the elastic element 37 is a spring, and the two ends of the spring are connected to the slide 332 and the flow deflector 36 respectively. When the flatbed is moving normally, the spring is in a compressed state.

[0078] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A connecting device (100) for mining flatbed trucks, characterized in that, Suitable for connecting two adjacent mining flatcars, the mining flatcar connecting device (100) includes: The first connector (1) includes a first connecting part (11) and a second connecting part (12) for rotatably connecting to a mining flatbed car. The second connector (2) includes a third connector (21) and a fourth connector (22) for rotatably connecting to a mining flatbed car. The connector (3) is rotatably connected to both the first connecting part (11) and the third connecting part (21); Wherein, the rotation axis of the first connecting part (11) relative to the connecting member (3) is perpendicular to the rotation axis of the second connecting part (12) relative to the mining flatcar, and the rotation axis of the third connecting part (21) relative to the connecting member (3) is perpendicular to the rotation axis of the fourth connecting part (22) relative to the mining flatcar. The connector (3) includes a first connecting plate (31), a second connecting plate (32), and a sliding rod (33). The first connecting plate (31) and the second connecting plate (32) are slidably connected to the sliding rod (33). The first connecting plate (31) is connected to the first connecting part (11), and the second connecting plate (32) is connected to the third connecting part (21). The slide member (33) includes a slide rod (331) and a slide seat (332), the slide seat (332) being connected to the slide rod (331); at least one of the first connecting plate (31) and the second connecting plate (32) has a cavity for containing gas, the slide seat (332) being slidably disposed in the cavity and dividing the cavity into a first gas cavity (34) and a second gas cavity (35); The slide bar (331) is located on the side of the slide block (332) near the second air chamber (35). The second air chamber (35) is provided with a flow buffer plate (36). The flow buffer plate (36) is fixedly connected to the side wall of the second air chamber (35). The flow buffer plate (36) divides the second air chamber (35) into a first buffer chamber (351) and a second buffer chamber (352). The flow buffer plate (36) has a plurality of buffer holes that connect the first buffer chamber (351) and the second buffer chamber (352). The first buffer cavity (351) is provided with an elastic element (37), which has two ends that can be extended and retracted. The two ends of the elastic element (37) abut against the slide (332) and the buffer plate (36) respectively.

2. The mining flatbed car connecting device (100) according to claim 1, characterized in that, It also includes a shaft assembly (4), at least one of the first connecting part (11) and the third connecting part (21) being rotatably connected to the connector (3) via the shaft assembly (4).

3. The mining flatbed car connecting device (100) according to claim 2, characterized in that, The shaft assembly (4) includes a rotating shaft (41), a first blocking part (42) and a second blocking part (43), the first blocking part (42) and the second blocking part (43) are respectively arranged at both ends of the rotating shaft (41) and are both connected to the rotating shaft (41).

4. The mining flatbed car connecting device (100) according to claim 3, characterized in that, The rotating shaft (41) includes a shaft segment (411) and a connecting segment (412). The first blocking part (42) is connected to the shaft segment (411), and the second blocking part (43) is movably connected to the connecting segment (412). A stepped surface (413) is formed between the shaft segment (411) and the connecting segment (412) and is arranged toward the second blocking part (43). The shaft assembly (4) further includes a stop member (44) which is threadedly connected to the connecting section (412) to drive the second blocking part (43) to abut against the stepped surface (413).

5. The mining flatbed car connecting device (100) according to claim 4, characterized in that, The shaft assembly (4) further includes a locking pin, the stop member (44) has a plurality of locking grooves (441) arranged circumferentially along the shaft (41), the connecting section (412) has a locking hole (4121), and when the locking groove (441) is aligned with the locking hole (4121), the locking pin passes through the locking groove (441) and the locking hole (4121).

6. The mining flatbed car connecting device (100) according to claim 1, characterized in that, A pressure monitor (5) is provided inside the second buffer chamber (352).

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