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Bottom dump truck

Mining carts are narrow-gauge railway transport vehicles that transport bulk materials such as coal, ore, and vermiculite in mines. Generally, locomotive or winch must be used for towing.

This series of mining trucks are widely used in coal mines, iron mines, phosphate mines and other underground and ground coal, vermiculite and other transportation. They are commonly used transportation equipment in coal mines.

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Bottom dump truck use, characteristics and use environment

A minecart is a narrow-gauge railway transport vehicle that transports loose materials such as coal, ore, and vermiculite in a mine. Generally, it must be pulled by a locomotive or a winch

This series of mining trucks are widely used in coal mines, iron mines, phosphate mines and other underground and ground coal and vermiculite transportation. They are commonly used in coal mines and other transportation equipment.

The minecart runs smoothly regardless of the curve or straight

Mining truck frame adopts riveted welding structure, which reduces the impact of stress on the mining cart and increases the service life of the mining cart

This type of mining cart has the advantages of firm structure, beautiful appearance, reliable performance, flexible and stable operation, etc.

The frame is a metal structure that can withstand traction, automatic forces, collision forces between mine cars and rail impact forces

The bottom unloading type mine car is to realize the automatic dumping and unloading of the carriage and automatic reset by the unloading wheel arm through the unloading curved track during the traveling of the mine car. High efficiency, safety and reliability

Example of bottom dump truck model meaning

Bottom dump truckBottom dump truck

Technical performance table of bottom dump truck

model

Content
product

Hold
Carry
weight
the amount
t

most
Big
Carry
weight
t

gauge
mm

Dimensions

axis
distance
mm

wheel
path
mm

Lead
lead
high
mm

amount
set
Lead
lead
force
KN

Unload
Carry
angle
°

car
body
weight
the amount
kg

box
body
wall
thick
mm

most
small
song
half
path
m

long
mm

width
mm

high
mm

MDC-3.3 / 6

3.3 m³

3

5.3

600

3450

1200

1380

1100

350

320

60

50 °

1687

5

15

Height H and traction height h, calculated from the rail surface (at no load) The loading capacity is calculated according to the bulk density of the material ρ = 900 kg / m3

Working principle of bottom dump mine car

Bottom dump truck

The ore cart is towed by a locomotive or a winch, and walks on the narrow-gauge railway of the coal mine ground and underground roadway, thereby realizing the transportation of materials. During the traveling of the minecart, the unloading wheel arm passes the unloading curved track to realize the automatic dumping and unloading of the car box and automatic reset.

Bottom dump truck

The main structure of the bottom dump truck

Structural drawing of bottom dump truck

The bottom unloading type mine car mainly consists of a car box, a frame, a buffer, an open wheel pair, a connecting device, a turning part and the like.

Carriage: It consists of welding of box plate, end plate, angle steel, and strip steel. The mechanical and physical properties of the material are not lower than Q235-A steel. Its technical conditions comply with the provisions of "JB / T6992-1993".
1 The steel plate and section steel of the carriage shall be straightened before riveting. The flatness of the rear surface of the carriage shall not exceed 3 ‰ (less than 1000mm calculated as 1000mm), but the maximum shall not exceed 6mm.
2 The difference between the two diagonal lines of the trunk opening should not be greater than 6mm.
3 The plane of the bottom door shall be flat, and its flatness shall not exceed 2mm per square meter, and the maximum shall not exceed 3mm.


The frame is a metal structure that can withstand traction, automatic forces, collision forces between mine cars, and rail impact forces. It is composed of channel steel, contact seat, axle card and other welding. Its technical conditions conform to the provisions of "JB / T6992-1993".
1 The section steel for the frame should be straightened before riveting, and its straightness should not be greater than 1.5 ‰. After the frame is made, the two pairs of sides should be parallel to each other. The parallelism tolerance is 2 ‰ of the side length, and the frame flatness tolerance. It is 2 ‰ of the length of the frame (excluding the buffer), but the maximum cannot be greater than 5mm.
2 After the frame is completed, the support surfaces of the four-axle frames should be on the same plane, and the center surfaces of the two shaft frames on the same axis should be perpendicular to the longitudinal center surface of the frame. The difference between the centerline distance between the two axle brackets on the same side of the frame (axle card or axle guide frame with vertical buffer spring) and the distance between the centerlines of the two axle brackets on the opposite side must not exceed 2mm The difference must not be greater than 3mm).
3 The center plane of the frame traction device should be symmetrical to the longitudinal center plane of the frame, and its symmetry tolerance should be no greater than 6mm.
4 The connection between the dump wheel components and the carriage should be firm and reliable. After assembly, the hinges should rotate flexibly, and the coaxiality of each set of rotary shaft holes of the frame and the bottom door is not greater than 2mm.

a
1 Open wheelset: It consists of wheels, shafts, bearings, etc. Its technical conditions comply with the provisions of "JB / T6992-1993".
2 Before assembling the wheelset, clean the iron filings and blockages, and clean the parts. When the bearing is assembled, it should be pressed in without impact load. After the bearing is installed, the wheel can rotate flexibly.
3 Wheel tread hardness Surface heat treatment hardness is ≥40HRC.
The 4-wheel pair seal is tight and reliable.

The technical conditions of the buffer are in accordance with the provisions of "JB / T6992-1993".
1 The buffer has sufficient strength, where the impact toughness of the buffer head material is not less than 30J / cm2
2 The cast steel bumper must not have cracks. The surface and end of the bolt hole of the cast steel bumper (within 30mm from the edge of the bolt hole) are not allowed to have defects such as shrinkage, shrinkage, air holes and trachoma that affect the strength. Perform welding repair.

The connecting device is composed of a connecting three-ring chain and a connecting pin. The connecting three-ring chain meets the requirements of MT 244.1-2005 "Mine Narrow-gauge Vehicle Connector Connection Chain" standard.
The connecting bolt meets the requirements in the standard "MT 244.2-2005 Coal Mine Narrow Gauge Vehicle Connector Connecting Bolt". Sinking, and shall not be repaired.

Assembly requirements
1 Before assembly, all parts (including purchased parts and standard parts) must be inspected and qualified before they can be used.
2 All parts should be cleaned and carried out in a clean environment.
3 The hauling height of the mining truck is ± 3mm, the total width is ± 5mm, the total height is ± 8mm, and the total length is ± 10mm.
4 The carriage should be installed symmetrically to the longitudinal center plane of the frame, and its symmetry tolerance is 5mm.
5 The assembled minecart shall be placed on a special straight road for inspection, and no gap between a wheel and the rail surface shall be greater than 2mm.
6 The minecart runs smoothly on the curve or straight.
7 Each part is coated with phenolic primer, and the body is top-coated according to the contract requirements. The appearance of the paint is required to be uniform, flat, consistent in color, complete in coverage, and free from defects such as brush marks, peeling, accumulation and blistering. Check the adhesion of the paint film with a grid. The coating does not fall off or partly fall off at the edge of the lattice or at the intersection of the cuts, and the peeling area is not more than 15%. Perform welding repair.

Bottom dump truck

Installation and commissioning of bottom-loading minecart

Preparation before installation

Before installing the minecart, first check the installation position of the minecart, check the track laying, whether the parallelism and flatness of the two rails meet the requirements, and adjust if necessary. The top of the straight track should be at the same level, and the allowable error in the length direction should not exceed 1mm per meter and 3mm per 10m. The allowable error on the corresponding measuring points in the left and right directions does not exceed 2mm.

installation

After carefully checking that there are no problems, according to the installation requirements, ensure that the centerline of the wheelset of the minecart coincides with the centerline of the track.

Trial run

During the trial operation, observe whether the pair of mine wheels and the track are in conflict, and deal with them in time to prevent damage to the mine cart.
During the trial operation, observe the car sliding along the slope and colliding with another car, and observe whether the car body is inclined, out of track or overturned.
During the trial operation, observe whether the mine car is traveling on the track with the smallest radius of curvature, and whether there are collisions, interference, and railing.

Bottom dump truck
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