88results about "Tipping wagons" patented technology

An automated carrier system is disclosed for moving objects to be processed. The automated carrier system includes a base structure of a carrier on which an object may be supported, and at least two wheels mounted to at least two motors to provide at least two wheel assemblies, the at least two wheel assemblies being pivotally supported on the base structure for pivoting movement from a first position to a second position to effect a change in direction of movement of the carrier.

A hydraulic side dumping type mine car for a mine field comprises a chassis and a compartment body, a bearing frame is fixed to the chassis, a round groove is formed in the top of the bearing frame, a round bottom is connected to the bottom of the compartment body and placed on the round groove, a first rotating shaft is arranged in the middle of the top of the compartment body, two side doors are rotationally arranged on the first rotating shaft, and cantilevers are connected to the side doors. The cantilever is rotationally arranged on the first rotating shaft, the end of the cantilever is rotationally connected with a first connecting rod, and the round bottom end is rotationally connected with the end of the first connecting rod through a second connecting rod; a shaft seat is arranged on the chassis, a locking mechanism is arranged on the shaft seat, and the rotating positions of the first connecting rod and the second connecting rod are positioned on the shaft seat. According to the hydraulic side dumping type mine car, the side door on any side can be opened for unloading; a discharging plate is carried on the mine car, and during discharging, the discharging plate on the discharging side guides mineral aggregate to be away from the track.

A self-tipping railway car with an automatic unloading detection device, belonging to the field of railway transportation, includes a self-tipping railway car with axle suppression mechanism. The left and right ends of the car's bottom are respectively mounted on the vehicle via a first cylinder and a second cylinder. A solenoid valve is mounted on the vehicle to control the intake and exhaust of the first and second cylinders. A battery box and a power supply box are mounted on the side bolster beams of the vehicle and are electrically connected. A signal transceiver is installed inside the power supply box and is electrically connected to a time relay. The time relay is electrically connected to the solenoid valve, controlling the first stage of the solenoid valve's operation. A first synchronous signal transceiver is installed inside the power supply box, and a second synchronous signal transceiver is installed on the end wall of the self-tipping railway car. A limit switch device detects the opening and closing status of the side doors of the self-tipping railway car. This design solves the problem of automatic unloading of the self-tipping railway car with axle suppression mechanism, eliminating the safety hazard of tipping over during the unloading process.

This utility model discloses a mine car that facilitates unloading, relating to the field of mine car technology. It includes: a frame with a bucket rotatably connected to it; a pair of rotating shafts, fixedly mounted on both ends of the bucket, with the shafts located on one side of the bucket's vertical centerline; a pair of end plates, fixedly mounted on both ends of the frame's upper surface, with the rotating shafts rotatably connected to the end plates; and a tipping switch assembly, including a rotating rod rotatably mounted on the upper end of the end plates, a stop bar fixedly mounted on one end of the rotating rod, and a stop block fixedly mounted on the bucket corresponding to the stop bar. This utility model allows the bucket to become unrestrained as the mine car moves forward. By positioning the rotating shafts on one side of the bucket's vertical centerline, a center of gravity shift effect is created, allowing the bucket to tip over under its own weight, emptying the material inside. This eliminates the need for complex mechanical structures, reducing the mine car's manufacturing cost, and the simple structure reduces maintenance costs.

The utility model discloses an anti-rollover discharging device for mine car transportation, and relates to the technical field of mine car transportation. The anti-rollover transport vehicle comprises a main frame mechanism, the main frame mechanism comprises a transport vehicle body, an anti-rollover assembly is arranged in the transport vehicle body, an auxiliary assembly is arranged at the top of the transport vehicle body, the auxiliary assembly comprises a buckle plate, the anti-rollover assembly comprises a motor, and a cavity is formed in the transport vehicle body. The anti-rollover assembly is arranged, specifically, when the gravity center of the transport vehicle hopper body moves leftwards during unloading, the motor is started to drive the two moving blocks to move rightwards through forward rotation of the threaded rod, and the moving blocks can drive the balancing weight to move rightwards when moving, so that mutual force is formed between the balancing weight and the gravity center of the transport vehicle hopper body; by means of the technical scheme, the situation of rollover during discharging is avoided, safety accidents are reduced, meanwhile, the rollover probability is reduced, the working efficiency can be greatly improved, and resource waste is greatly reduced.

The utility model relates to the technical field of mining equipment, in particular to a mining dumper. The mining dumper comprises a dumper frame, a top rail of the dumper frame is connected with a guardrail, two sets of rail wheels are installed at the bottom of the dumper frame, multiple sets of limiting grooves are formed in the top of the dumper frame, multiple sets of separating hoppers are arranged at the tops of the multiple sets of limiting grooves, and moving wheels are installed on the two sides of the multiple sets of separating hoppers. The connecting structure comprises a connecting base, a connecting buckle and a connector, the connecting base is fixedly connected to one side of the frame, a through hole is formed in the center of the connecting base, the connecting buckle is movably connected to the interior of the through hole, the connector is fixedly connected to the other side of the frame, a through hole is formed in the center of the connector, and the connecting buckle is movably connected to the interior of the through hole. The mining dumper provided by the utility model has the advantage that minerals can be transported to a mine hole position without a track through the separable separating hopper.

A large plate tilt railroad car including a plate support assembly having a plurality of spaced-apart plate supporters including a plurality of plate holders simultaneously movable from loading positions in which one or more large steel plates can be loaded on the railroad car to transit positions in which one or more large steel plates can be transported using the railroad car.

This utility model discloses a coal mine transportation device, relating to the field of coal mine transportation technology, comprising: a frame; two arc-shaped grooves symmetrically arranged at both ends of the top of the frame; and two limiting grooves symmetrically arranged on the arc-shaped grooves. The vertical cross-section of the limiting grooves is set as an isosceles trapezoid with a larger upper section and a smaller lower section, and the vertical cross-section of the limiting grooves increases uniformly from the center of the arc-shaped grooves to both sides. When the U-shaped bucket is pulled to one side, the inclined block moves upward along the limiting grooves and penetrates into the limiting grooves. During the pulling process, due to the design of the inclined block and the limiting grooves with a larger upper section and a smaller lower section, the U-shaped bucket will not easily slide down when it is pulled to one side and tilted, improving the stability of tilting and dumping. The requirements for the pulling angle are lower, and the operator does not need to precisely control the direction, greatly simplifying the operation process.

The utility model discloses support transfer equipment for gob-side entry retaining of an underground coal seam in the field of transfer, which comprises a chassis and rollers rotatably connected to the bottom of the chassis, a rotating support is connected to the top of the chassis, a rotating shaft is rotatably connected to the rotating support, a car hopper is connected to the rotating shaft, and a dividing part is connected to the top of the car hopper. The rotating shafts are symmetrically distributed on the two sides of the car hopper, the rotating shafts are connected with ratchet wheel components, and the rotating shaft on the other side of the car hopper is connected with a rotating component. Therefore, the storage utilization rate of the inner space of the car hopper to the supports is increased, meanwhile, the situation that the supports shake is reduced, and meanwhile the discharging speed of the supports can be increased by adopting a rotary dumping mode.

The utility model provides a double-arm car puller with a pitching clasp big arm, which comprises walking wheels, a clasp big arm, a car body, a walking driving unit, a hook big arm, a first connecting rod mechanism, a second connecting rod mechanism, a first pitching driving unit and a second pitching driving unit, the clasp big arm is hinged with the tail end of the car body, and the hook big arm is hinged with the front end of the car body. The first pitching driving unit is connected with the clasp large arm through a first connecting rod mechanism, the second pitching driving unit is connected with the hook large arm through a second connecting rod mechanism, and the clasp large arm and the hook large arm are both pitching mechanisms and are installed on the same side of the vehicle body; a U-shaped groove is formed in the end head of the other end of the large clasp arm, a railway coupler is arranged at the end head of the other end of the large hook arm, and the maximum outline turning radius r of the large clasp arm is smaller than the distance R from the railway open wagon accessory to the turning center of the large clasp arm. The utility model has the advantages of simple structure, safety, reliability, light equipment weight and greatly reduced installation and maintenance cost.

The utility model relates to the technical field of coal mine transportation, and discloses a coal mine transport vehicle which is characterized in that a mounting box is mounted at the bottom of a vehicle frame in the advancing end direction, one side of the mounting box is connected with a buffer box, two damping cylinders are symmetrically mounted on the two sides in the mounting box, and when a collision arc block is collided, an extrusion inclined block is driven to move, and the buffer box is connected with the buffer box; preliminary buffering is achieved through a buffering spring, when impact stress is large, extrusion inclined blocks on the two sides of the extrusion inclined blocks are extruded through the extrusion inclined blocks, the two extrusion inclined blocks move in the opposite directions, a compression column can move into a damping cylinder, and second-step buffering protection is achieved by compressing a reset spring through the compression column; and meanwhile, damping liquid is contained in the damping cylinder, the damping liquid can be compressed synchronously in the moving process of the compression column, buffering energy absorption in the third step is achieved, buffering protection on the transport vehicle is achieved through the means of multiple sets of buffering protection, collision damage is avoided, and it is guaranteed that the transport vehicle can be stably transported.

The utility model discloses an automatic railway dumping car with an anti-freezing device, and belongs to the technical field of railway dumping cars. The automatic dumping car solves the problems that an existing railway automatic dumping car is low in unloading efficiency and high in labor cost, and dust on an unloading site has certain influence on health and safety of operators. A recognition device is arranged in an unloading area on the outer side of a vehicle body, a signal transceiver arranged in a power box is in wireless connection with the recognition device, a first jacking air cylinder and a second jacking air cylinder are transversely and symmetrically arranged at the bottom of the vehicle body, and execution ends of the first jacking air cylinder and the second jacking air cylinder are respectively connected with the vehicle body. The signal transceiver is connected with the first electromagnetic valve and the second electromagnetic valve through wires, the first electromagnetic valve is connected with the first jacking air cylinder, the second electromagnetic valve is connected with the second jacking air cylinder, and a vortex tube is laid on the vehicle body. According to the automatic railway dumping car with the anti-freezing device, the unloading efficiency is improved, and the labor cost of a production enterprise is reduced.

The invention provides a self-dumping car with a pneumatic control function, and relates to the technical field of self-dumping cars, the self-dumping car with the pneumatic control function comprises a compartment, a bottom beam, a tipping air cylinder, an air control pipeline and a control assembly, the two ends of the tipping air cylinder are hinged to the carriage and the bottom beam correspondingly, and the tipping air cylinder is used for driving the carriage to tip over towards the two sides. The air control pipeline comprises an electric control valve, the electric control valve is correspondingly connected with the tipping air cylinder and is in communication connection with the control assembly, and the control assembly is used for obtaining an operation instruction and tipping state data of the carriage and controlling the electric control valve to act according to the operation instruction and the tipping state data. According to the invention, the unloading efficiency and the applicability are relatively high.

An automated carrier system is disclosed for moving objects to be processed. The automated carrier system includes a discontinuous plurality of track sections on which an automated carrier may be directed to move, and the automated carrier includes a base structure on which an object may be supported, and at least two wheels assemblies being pivotally supported on the base structure for pivoting movement from a first position to a second position to effect a change in direction of movement of the carrier.

The invention provides a double-side-turning container type self-discharging truck for a coal mine. The double-side-turning container type self-unloading truck for the coal mine comprises a truck assembly, a driving assembly and a side-unloading container assembly, wherein the driving assembly and the side-unloading container assembly are arranged on the truck assembly; the driving assembly is used for driving the side-unloading container assembly to turn over towards the two sides of the truck assembly; the side unloading container assembly comprises a container body, unloading openings are symmetrically formed in the two sides of the container body, and the side unloading container assembly is connected with the truck assembly through a hinge assembly. The double-side-turning container type self-discharging truck for the coal mine has the two-way efficient discharging capacity and high derailing resistance reliability, and the technical problem that an existing rail type self-discharging truck cannot adapt to complex roadway layout due to the single discharging direction is solved.

The invention discloses an efficient muck removal construction device for a large-gradient railed inclined shaft of a water delivery tunnel, which comprises a slope trestle road, a bent rail, a head sheave, a steel wire rope, a head sheave frame, an elevator, a console, a side dumping mine car, a first sensing device, a muck transfer bin and a second sensing device, a bent rail is arranged on the slope trestle road; a head sheave is arranged at the upper part of the bent rail and is supported by a head sheave frame; an elevator and a control console are arranged in front of the head sheave frame; the side dumping type mine car is located on the bent rail and connected with the head sheave and the elevator through steel wire ropes. A first induction device is arranged in the middle of the bent rail, a ballast transferring bin is arranged on the lower portion of the induction device, and a second induction device is arranged at the tail of the ballast transferring bin. And signals of the first sensing device and the second sensing device are gathered to the console. According to the invention, the waste slag transportation safety is ensured, the slag discharging efficiency is improved, and the labor cost is reduced.

The present invention relates to an orbital transportation device capable of automatically adjusting its attitude for a large-inclination tunnel, which includes a box body, a chassis and a first auxiliary wheel pair. The chassis is installed at the bottom of the box body, and two sets of running wheel pairs are installed on the chassis. The first auxiliary wheel pair is located between the two sets of running wheel pairs, and the axle in the first auxiliary wheel pair is rotatably installed on the chassis. Wherein, when the orbital transportation device moves to the curved part of the large-inclination track, the wheel axle of the first auxiliary wheel pair rotates to make the auxiliary wheel pair touch the track, so as to cooperate with the running wheel pairs to turn. After turning, the wheel axle in the first auxiliary wheel pair rotates to make the auxiliary wheel pair derail, and the orbital transportation device uses the running wheel pairs to travel. The orbital transportation device provided in the present invention can adapt to the turning requirements of curved parts with different inclinations, maintain its own stability and ensure transportation safety.

The present application relates to the technical field of conveying mine car, and particularly discloses a hydraulic side-unloading mine car, which comprises a car body structure, a loading and unloading structure is fixedly arranged on the car body structure, a driving structure is fixedly arranged on the car body structure, and the driving structure is located at the rear side of the loading and unloading structure. The present application has the beneficial effects that the hydraulic drive is combined with the mechanical transmission to realize precise and controllable bidirectional overturning, is more flexible in adapting to scenes, and improves the operation efficiency in narrow spaces; the gravity drive and the spring force storage are combined with the linkage locking mechanism to realize automatic unloading and resetting, ensure that the container will not be automatically opened due to bumping during driving, improve the transportation safety, the wheel track is adjustable to adapt to different tracks, solve the pain point that the traditional mine car with fixed wheel track cannot adapt to different tracks, and reduce the equipment replacement cost.

The utility model belongs to the technical field of dump tramcars, and discloses a single-side curved rail side dump tramcar which comprises a frame body, four tramcar wheels are symmetrically installed on the two sides of the bottom of the frame body, a plurality of second supports are evenly distributed on the frame body, a carriage body is hinged to the second supports, and the carriage body is hinged to the bottom of the frame body. Pulleys are mounted at the bottom of one side, far away from the second support, of the carriage body, two first supports are symmetrically mounted on one side, far away from the second support, of the frame body, and two connecting rod frames are symmetrically mounted at two ends of the carriage body. According to the single-side curved rail side dumping type mine car, the arrangement of side turning is controlled through the connecting rod structures at the two ends, so that the stability of side turning is guaranteed, and the angle of side turning is increased; the linkage opening and closing of the carriage door are controlled through a connecting rod structure, so that the self-locking closing and accurate opening and closing of the carriage door are ensured; and through the arrangement of elastic buffers at the two ends, damage caused by mutual collision in the using process is reduced.

The invention relates to the technical field of conveying mine cars, and particularly discloses a hydraulic side dumping mine car which comprises a car body structure, a loading and unloading structure is fixedly arranged on the car body structure, a driving structure is fixedly arranged on the car body structure, and the driving structure is located on the rear side of the loading and unloading structure. Precise and controllable bidirectional overturning is realized, the adaptive scene is more flexible, and the working efficiency in a narrow space is improved; a linkage clamping and locking mechanism driven by gravity and stored by a spring realizes automatic unloading and resetting, ensures that a container cannot be automatically opened due to bumping in the running process, improves the transportation safety, is adjustable in wheel track and adapts to different rails, solves the problem that the fixed wheel track of a traditional mine car cannot adapt to different rails, and reduces the equipment replacement cost.

The invention discloses a transport vehicle for coal mine mineral aggregate. The transport vehicle comprises a base, a first connecting device and a box body. Wherein the base is provided with a bearing surface, the first connecting device comprises a first connecting device first end and a first connecting device second end which are in sliding connection, and the first connecting device first end is arranged on the bearing surface; the bottom surface of the box body comprises a first bottom plate, a second bottom plate and a bottom plate connecting part, the first side of the first bottom plate is rotatably connected with the first side of the second bottom plate through the bottom plate connecting part, and the second end of the first connecting device is connected with the base; the first side of the first bottom plate and the first side of the second bottom plate are driven to move in the direction perpendicular to the bearing surface, so that the first bottom plate and the second bottom plate are obliquely arranged relative to the bearing surface; a discharging opening is formed in the side portion of the box body and used for discharging coal mine mineral aggregate. According to the scheme, unloading can be conducted on the two sides of the transport vehicle, and the unloading efficiency is improved.

The present invention provides an underground auxiliary transport robot iCAR and a control method thereof, which relates to the technical field of underground equipment, including a chassis, a steering wheel, an omnidirectional driving control system, a full-section visual navigation system, a master-slave robust multimodal navigation system and a loading and unloading system, wherein the chassis is a rectangular structure; the number of steering wheels is four; the omnidirectional driving control system is arranged on the chassis, and the omnidirectional driving control system is connected to the four steering wheels; the full-section visual navigation system is arranged on the chassis, and the full-section visual navigation system is connected to the omnidirectional driving control system, for obtaining environmental information and sending data frame information to the omnidirectional driving control system; the master-slave robust multimodal navigation system is arranged on the chassis, and the master-slave robust multimodal navigation system is used to obtain the position information and posture information of the underground auxiliary transport robot iCAR and send it to the omnidirectional driving control system; the loading and unloading system includes a lifting mechanism and a loading container used in conjunction with the lifting mechanism, and the lifting mechanism is installed on the chassis. The present invention has high transportation efficiency.

A large plate tilt railroad car including a plate support assembly having a plurality of spaced-apart plate supporters including a plurality of plate holders simultaneously movable from loading positions in which one or more large steel plates can be loaded on the railroad car to transit positions in which one or more large steel plates can be transported using the railroad car.

The invention relates to the field of dump transportation, in particular to a tipping bucket type tramcar with self-dumping and self-returning functions, which comprises a ground, two rails and a rail tractor, the two rails are mounted in the middle of the surface of the ground side by side, the rail tractor rolls on the rails, a tramcar is placed at the tops of the rails, and the tramcar is arranged on the ground. The tramcar is connected with the rail tractor through an inserting rod, the rail tractor drags the tramcar to advance on a rail, a first automatic discharging mechanism or a second automatic discharging mechanism is installed at the left end of the tramcar, a first stand column is vertically installed on the rear side of the ground surface, and a stop rod is installed at the top of the first stand column. The defects that a traditional car dumper is large in size, high in manufacturing cost, time-consuming and labor-consuming in dismounting and transferring and tedious in unloading process are effectively overcome, unloading equipment does not need to be additionally arranged, the operation process is greatly simplified, manpower and equipment maintenance cost is reduced, manual intervention is not needed in the whole unloading and returning process, the coal transportation period is remarkably shortened, and the coal transportation efficiency is improved. And the transportation efficiency of the mine bulk materials is greatly improved.

Unloading device for emptying containers filled with bulk materials and open at the top, in particular containers on container wagons, by means of a height-adjustable fork carriage (7) with a pair of forks (8) which can be inserted into a fork pocket on the underside of the container (20), wherein the fork carriage (7) is arranged on a rotatable part (3) which is rotatably connected to a support (2) in a pivot axis (15) which runs parallel to the longitudinal axis of the container (20) being received, characterized in that the rotatable part (3) is rotatably connected to the support (2) by a joint assembly (14) consisting of two articulated levers (14a, 14b), one end of which is mounted in a common pivot axis (12), wherein one end of the main control cylinder (11a) for controlling the raising and lowering of the rotatable part (3) is rotatably connected to this common axis (12).while the other end of the first joint lever (14a) is rotatably connected to the support and the other end of the second joint lever (14b) is rotatably connected to the rotatable part (3), and that an auxiliary control cylinder (11b) is provided, which is attached at one end to the support (2) and at the other end to the rotatable part (3) at a pivot point located on the rotatable part between the attachment point of the second joint lever (14b) on the rotatable part (3) and the axis of rotation (15).

The invention relates to the technical field of coal mine unloading, and discloses an underground transportation system which comprises a side-dumping tramcar and a track matched with the side-dumping tramcar, a walking wheel assembly is fixedly connected to the surface of the side-dumping tramcar in the direction close to the gravity center of the earth surface, and the underground transportation system further comprises an anti-falling mechanism arranged on the walking wheel assembly. The anti-falling mechanism comprises an inclined frame fixedly connected to the surface of the walking wheel assembly, a rotating wheel is rotationally connected to the surface of the inclined frame, the periphery of the rotating wheel is sleeved with a rubber ring, the guide mechanism is arranged on the rail and used for being matched with the side dumping type mine car to achieve guiding when the side dumping type mine car unloads, and the guide mechanism comprises a carrier fixedly installed on the rail. Through the arrangement of the anti-falling mechanism, when the side dumping type mine car tends to be unstable due to factors such as speed, load or unbalance load, the rotating wheel rolls along the arc-shaped guide rail I under the assistance of the rubber ring, the car body is forcibly limited from a dangerous to-be-dumped state to a restrained and guided safe movement state, dumping accidents are restrained, and safety benefits are improved.

An object processing system is disclosed that includes a plurality of track sections, and a plurality of remotely actuatable carriers for controlled movement along at least portions of the plurality of track sections, each of the actuatable carriers being instructed at any time to move a limited number of track section only.

To provide a ground hydraulic station for a car damper which can adapt to the movement of a car damper body, realize functional needs, and improve reliability of a system.SOLUTION: Regarding a ground hydraulic station for a car dumper, a hydraulic member includes a protective case, a hydraulic pump attached inside, and a valve station for use in combination with the hydraulic pump, and the hydraulic pump and the valve station are connected to a hydraulic expansion cylinder of the car damper through a pipeline to control the use of the car damper. The hydraulic system of a car damper body is moved from the body to nearby ground and sealed away, and the temperature is automatically controlled. An oil source on the ground, a valve group, and a balance cylinder are connected to a main hydraulic cylinder and a hydraulic lock using high-pressure hose and a drag chain, and the pipeline is fully automatically wound up between the car damper body and the hydraulic member by a pipeline winding member.SELECTED DRAWING: Figure 1

The utility model relates to the technical field of mining instruments, in particular to a tunnel sectioning vehicle for mine mining, which comprises a vehicle frame, a vehicle hopper, a plurality of supporting beams and an outer box, a wheel pair is mounted at the bottom of the vehicle frame, the supporting beams are erected at the top of the vehicle frame, the vehicle hopper is fixedly connected to the tops of the supporting beams, and the outer box is fixedly connected to the vehicle hopper. The first end of the supporting beam in the length direction is hinged to one side of the vehicle frame in the width direction, a pouring opening is formed in the side wall, close to the first end of the supporting beam, of the vehicle hopper, the vehicle hopper is sleeved with the outer box, a plurality of guide rods are longitudinally fixed to the vehicle frame, the guide rods are sleeved with sliding sleeves in a sliding mode, the sliding sleeves are fixedly connected to the outer box, and the outer box is fixedly connected to the vehicle frame. The two ends, in the advancing direction of the frame, of the outer box are longitudinally and fixedly connected with connecting arms, the bottom ends of the connecting arms are fixedly connected with hook rods, the side wall, corresponding to the dumping opening, of the outer box is provided with an anti-interference notch for the car hopper to move, and the requirement for ore unloading equipment can be effectively lowered.

The invention provides a large-dip-angle blind inclined shaft reverse construction device and method. An ore raking winch is arranged at the top of an inclined shaft, and rock slag is filled into a side dumping type mine car located at a rock slag loading position through the ore raking winch and an electric rock raking machine; downwards transporting the side-dumping mine car filled with rock slag to a slag-dumping draw shaft along the track through a mine elevator arranged at the bottom of the inclined shaft and traction of a steel wire rope; a compartment is automatically tipped over through a side dumping type mine car by means of an unloading bent rail, so that rock slag unloading is achieved; and the traction direction of the steel wire rope is changed through a reverse lifting guide system, the unloaded side unloading type mine car is lifted upwards to a loading position along a rail arranged in the inclined shaft, and the next round of rock slag loading is carried out. The large-dip-angle long-distance blind inclined shaft reverse construction method has the technical effects of high efficiency, high safety and low cost of large-dip-angle long-distance blind inclined shaft reverse construction, and has important practical value for deep well mine construction.