KM70 Railway Coal Hopper Wagon 70T Air Control Bottom Doors

KM70 Railway Coal Hopper Wagon 70T Air Control Bottom Doors

1. Application

KM70 is suitable for operating on standard gauge rail lines and is used for transporting bulk goods such as coal and ore. It can meet the requirements of fixed grouping, circular use, fixed-point loading and unloading, and large-scale transportation by railway. It is widely applied in power plants, ports, Coal Company, steel and other enterprises. This hopper wagon is adapt to transmission device of material receiving pit like coal unloading trenches or high stack platforms with sufficient capacity for simultaneous unloading of coal on both sides of the railway. It can be unloaded automatically and quickly, and can also be manually unloaded in the absence of air sources.

2. Main structures

KM70 hopper wagon is mainly composed of wagon body, bottom doors opening and closing device, Air pipe line device, coupler draft gear, brake device and bogies.

• Wagon body

The wagon body is a fully welded steel structure, consisting of a chassis, side walls, end walls, funnels, eaves and escalators, bottom doors, and tie rods. The main steel sections and plates are made of Q450NQR1 high-strength weathering steel according to Chinese railway standards.

• Bottom door opening and closing mechanism:

It adopts two-stage transmission and two-stage locking top lock bottom door opening and closing device. It mainly consists of an upper transmission device and a lower transmission device.
The upper transmission device mainly consists of: upper transmission shaft, toothed clutch, rolling bearings, gears, limiters, upper crankshaft, clutch transmission shaft, reducer, 356mm × 280mm spinning type bidirectional action air cylinder, rack, roller, pressure pin seat, handwheel, gear cover, etc.

The lower transmission device mainly consists of: a lower transmission shaft, lower bearings, double levers, long top rods, short top rods, couplings, connecting rods, left and right locking bodies, and lower cranks.

• Air control unloading pipe line:

The air pipeline device consists of a supply air adjustment valve, a control valve, a cut-off plug valve, an air storage reservoir, a control panel, an air gauge, etc. The air source comes from the train main pipe and is filled into the air reservoir through the cut-off valve and the air supply adjustment valve, serving as the power source for the pneumatic opening of the bottom door. The opening and closing of the four bottom doors on both sides are controlled by a spinning type bi-directional air cylinder with a diameter of 356 mm × 280 mm during air control unloading process.

• Air brake device

• Hand brake machine

• Coupler & buffer

• Bogie

The bogie adopts K6 type cast steel three piece wagon bogie with a 23.5t axle load. The bolster and side frame are made of B-grade steel with a wide guide frame structure for the side. There is a cross support device between the two side frames. The bolster spring is of two-level rigidity.

3. Main technical parameters:

Pay load	70t
Tare weight	≤23.8 t
Capacity	75 m3
Axle load	23t
Gauge	1435mm
Coupler type	#17 coupler and MT-2 buffer
Coupler center height(empty)	880 mm
Length	14400 mm
Bogie type	K6 three big piece casting steel bogie
Fixed axle distance	1830mm
Wheel diameter	840mm
Load method	Upper load, bottom and sides unload
Number of unload hatches	4
Bottom door length	2800mm
Bottom door opening width	460mm
Brake method	Air brake
Brake distance	≤1400 m
Brake ratio	7.8
Transmission type	Two stage transmission and top lock mechanism
Max. running speed	120 km/h
Min radius	145m
Lifespan	25 years
Limit gauge	Comply with GB146 1-83 ‘standard gauge railway rolling stock gauge’

4. Drawing

5. Detail Photo