Two-level locking device, hopper car bottom door and hopper car

1. A two-level locking device, comprising:

a first transmission shaft;

a second transmission shaft;

a clutch;

a pressure mechanism; and

a reset mechanism,

wherein the clutch comprises a locking key limiting seat and a locking key, wherein the locking key limiting seat has a key slot and is fixedly connected to the first transmission shaft, the locking key is fixedly connected to the second transmission shaft, wherein the pressure mechanism can apply a pressure to the locking key to deviate the locking key from the key slot of the locking key limiting seat, so that the first transmission shaft is separated from the second transmission shaft, and wherein the reset mechanism can apply a force to the locking key to insert the locking key into the locking key limiting seat again, so that the first transmission shaft and the second transmission shaft are re-jointed to reset.

2. The device of claim 1 , wherein the pressure mechanism comprises a pressure lever, a first bent lever, a first rotating shaft, a force application arm and a force application unit, wherein the pressure lever comprises an end m and an end n, the first bent lever comprises an end a and an end b, the end m of the pressure lever is hinged with the locking key, the end a of the first bent lever is connected to the end n of the pressure lever, the first bent lever is connected to the force application arm through the first rotating shaft, the force application unit can apply an upward acting force to the end b of the first bent lever, such that the first bent lever rotates clockwise with the first rotating shaft as the shaft to propel the pressure lever to move rightwards, and the pressure lever applies a rightward acting force to the locking key to deviate the locking key from the key slot of the locking key limiting seat, so that the first transmission shaft is separated from the second transmission shaft.

3. The device of claim 2 , wherein the force application unit comprises a first roller, a first locating pin and a first connecting piece, wherein a first through hole and a first slotted hole are formed on the force application arm, a second through hole and a third through hole are formed on the first connecting piece, a fourth through hole is formed on the first roller, the end b of the first bent lever sequentially penetrates through the first through hole and the second through hole, the first locating pin is inserted in the second through hole, the fourth through hole and the first slotted hole, when the first locating pin is located at the lower semicircle of the first slotted hole, the lower edge of the first roller protrudes from the force application arm to apply an upward acting force to the first roller, the first roller drives the first locating pin to move upwards, the first locating pin drives the first connecting piece to move upwards, and the first connecting piece applies an upward acting force to the end b of the first bent lever, until the first locating pin arrives at the upper semicircle of the first slotted hole.

4. The device of claim 1 , wherein the reset mechanism comprises a pull rod, a stop dog, an elastic component, a second bent lever, a second rotating shaft, a third rotating shaft, a plug, a reset arm and a limiting unit, wherein the pull rod comprises an end p and an end q, the second bent lever comprises an end c and an end d, the end p of the pull rod is hinged with the locking key, the end q of the pull rod is connected to the end c of the second bent lever through the third rotating shaft, the second bent lever is connected to the reset arm through the second rotating shaft, a holding space for the movement of the end q of the pull rod, the third rotating shaft and the end c of the second bent lever is arranged in the plug, the stop dog is fixedly connected to the pull rod, one end of the elastic component is fixedly connected to the stop dog, the other end of the elastic component is fixedly connected to the plug, when the locking key is jointed with the locking key limiting seat, the reset arm can prevent the second bent lever from rotating counterclockwise with the second rotating shaft as the shaft, and at this time, the elastic component is at a tensile state.

5. The device of claim 4 , wherein the limiting unit comprises a second roller, a second locating pin and a second connecting piece, wherein a fifth through hole and a second slotted hole are formed on the reset arm, a sixth through hole and a seventh through hole are formed on the second connecting piece, an eighth through hole is formed on the second roller, the end d of the second bent lever sequentially penetrates through the fifth through hole and the sixth through hole, the second locating pin is inserted in the sixth through hole, the eighth through hole and the second slotted hole, when the locking key is jointed with the locking key limiting seat, the second locating pin is located at the upper semicircle of the second slotted hole, and the upper semicircle of the second slotted hole prevents the second locating pin from moving upwards to prevent the second connecting piece from moving upwards, so as to prevent the second bent lever from rotating counterclockwise with the second rotating shaft as the shaft.

6. A hopper car bottom door, comprising the two-level locking device of claim 1 , wherein the pressure mechanism is a first door opening and closing arm of the bottom door, and the reset mechanism is a second door opening and closing arm of the bottom door.

7. A hopper car, comprising the hopper car bottom door of claim 6 .