1568 results about "Tipper truck" patented technology

The invention discloses an electric wheel dumper energy-saving control method and system based on braking energy recovery, and relates to the field of electric vehicle energy-saving control, and the method comprises the steps: calculating an energy fluctuation value through collecting wheel rotation speed deceleration, building a cross-cycle energy accumulation curve, and generating an energy prediction feature map; establishing a double-loop energy mapping relation according to the energy prediction feature map, dividing the double-loop energy mapping relation into a quick response path and an optimization calculation path, and outputting a time-sharing braking strategy; the torque switching process is compensated, and a smooth braking instruction is output; generating a segmented charging power curve in combination with the maximum allowable charging power; carrying out segmented adjustment on the charging current to generate a charging control signal and calculating real-time charging conversion efficiency; and the charging conversion efficiency value is distributed to the dual paths according to the time weight, and the time-sharing braking strategy is adjusted. By establishing a double-loop control strategy of braking energy prediction and charging efficiency optimization, the energy recovery efficiency is improved, and collaborative optimization of the braking and charging processes is realized.

The invention provides an autonomous unloading control method and system for a carry-scraper, and relates to the technical field of underground carry-scrapers, and the method comprises the steps: collecting roadway environment point cloud data; according to the roadway environment point cloud data, the position and posture of the carry-scraper are calculated; performing path control on the carry-scraper according to the pose of the carry-scraper in combination with the kinematics model of the articulated vehicle and the MPPI algorithm model; according to the target position, environment data of the dump truck are collected, and characteristics of the dump truck are extracted; fusing the characteristics of the dump truck to obtain fused characteristics of the dump truck, performing pose detection on the dump truck, and outputting coordinates of key points; according to the coordinates of the key points, the 3D pose of the dumper container is calculated; according to the 3D poses, key parameters of containers of the carry-scraper and the dumper are calculated; dynamically adjusting the posture of the bucket according to the key parameters; according to the adjusted posture of the bucket, global coordinates of bucket teeth of the bucket are calculated; and according to the global coordinates, the bucket teeth are adjusted so as to control the carry-scraper to carry out autonomous unloading.

The invention discloses an electric brake control system and method for an electrically-driven mining dump truck, and the system comprises a vehicle control unit VCU which is connected with an accelerator pedal, a brake pedal, a tilt angle sensor, a weighing sensor, an intelligent brake switch, a motor controller, a power battery and a retarder. The vehicle control unit VCU, the motor controller and the power battery sequentially form a closed loop, and the motor controller is further sequentially connected with the driving motor, the gearbox and the axle. Whether a vehicle is in a downhill state or not at present is analyzed through the vehicle control unit VCU, the slope angle and the vehicle weight are converted, the vehicle speed, the friction coefficient and the like are combined, appropriate electric braking torque of the vehicle is converted to keep the vehicle speed lower than a certain speed for downhill, and a driving motor is preferentially used for generating electricity and feeding back the electricity to a power battery to achieve braking. When the power generation braking force is insufficient, the retarder intervenes to supplement the braking torque, so that the electrically-driven mine truck automatically goes downhill at a stable speed, energy recovery is realized to the greatest extent, the cruising ability of the electrically-driven mine truck is improved, the electric quantity configuration of a power battery is reduced, and the effects of saving energy, reducing emission and reducing cost are achieved.

The invention relates to the technical field of semitrailers, and discloses a side-turning self-dumping semitrailer which comprises a semitrailer body, a carriage, a driving mechanism and a movable side carriage door, and a side baffle structure and a door locking structure corresponding to the movable side carriage door are arranged on a lower side beam of the carriage. The side baffle structure comprises a baffle, a balance weight beam arranged on the top of the outer side face of the baffle and a plurality of supporting pipes vertically arranged on the baffle, and the bottoms of the supporting pipes are connected with a lower side beam pivot of the carriage. The side baffle structure and the door locking structure of the rollover self-dumping semitrailer can be opened and closed by ingeniously utilizing the rollover acting force of the carriage, the reliability is high, additional power sources (such as an oil cylinder and an air cylinder) do not need to be arranged, the manufacturing cost and the maintenance cost are reduced, and meanwhile the oil leakage risk is avoided. Due to the linkage design of the movable side compartment door and the baffle, the unloading process is smoother, manual intervention is not needed, and the problem that tires are prone to being buried by goods during unloading of an existing side-tipping dumper is fundamentally solved.

A new energy mining dump truck gearbox comprises four motors, an input mechanism, a speed change mechanism and an output shaft connected with the speed change mechanism in a meshed mode, and is characterized in that the input mechanism comprises a front input assembly connected with the two motors respectively, a rear input assembly connected with the other two motors respectively, and a normally-meshed shaft; the constant meshing shaft is connected with the input end of the speed change mechanism, the rotating direction of the front input assembly is opposite to that of the rear input assembly, a front bevel gear meshed with the front input assembly and a rear bevel gear meshed with the rear input assembly are coaxially fixed to the constant meshing shaft, and helical teeth of the front bevel gear and helical teeth of the rear bevel gear are arranged in a mirror symmetry mode. The power of the front input assembly and the power of the rear input assembly are converged to the normally engaged shaft. The transmission reliability is improved, the failure rate is reduced, the connectivity of power during gear shifting is guaranteed, the risk of power interruption during lifting and unloading of the mine car is avoided, and the safety of continuous operation under the extreme working condition is improved.

The invention discloses a cooling fan dust removal system and method and a mining dump truck, and the system comprises a fan rotating speed presumption module which is used for detecting and calculating the rotating speed of an engine cooling fan; the control judgment module is used for judging whether fan dust removal is allowed to be executed or stopped according to the collected signals and data; and the dust removal execution control module is used for controlling the dust removal execution mechanism and the hydraulic cooling fan according to the judgment result of the control judgment module. According to the cooling fan dust removal system, automatic dust removal can be achieved, extra operation of personnel is not needed, the cooling air volume of the fan is guaranteed, meanwhile, the service life of the fan and the bearing can be prolonged, and the efficiency declining trend of a cooling system is slowed down. On the basis of vehicle state parameters including vehicle parking time, vehicle starting time, windscreen wiper water spraying frequency, working states of other gas path system components and the like, the dust removal time and time are reasonably controlled, and fine control is achieved.

The invention discloses an unmanned mining dump truck hydraulic braking system and a control method. The unmanned mining dump truck hydraulic braking system comprises a service brake valve set and a parking brake valve set. The service brake valve group comprises a first hydraulic proportional pressure reducing valve, a second hydraulic proportional pressure reducing valve, a first shuttle valve and a first pressure sensor; the first hydraulic proportional pressure reducing valve and the second hydraulic proportional pressure reducing valve are connected in parallel; oil outlets of the first hydraulic proportional pressure reducing valve and the second hydraulic proportional pressure reducing valve are communicated with an oil inlet of a first shuttle valve; an oil outlet of the first shuttle valve is connected with a first pressure sensor; the parking brake valve group comprises an electromagnetic directional valve, a redundant electromagnetic directional valve and a pressure switch; the electromagnetic directional valve is a normally closed valve, and the redundant electromagnetic directional valve is a normally open valve; the electromagnetic directional valve and the redundant electromagnetic directional valve are connected in series, the electromagnetic directional valve is connected with an oil inlet pipeline, the redundant electromagnetic directional valve is connected with an oil outlet pipeline and a parking brake caliper, and a pressure switch is arranged on the oil outlet pipeline.

The utility model relates to the technical field of automobile front axles, in particular to a mining dump truck front axle steering feedback device which comprises a front axle, steering knuckles are fixedly connected to the two ends of the front axle respectively, and steering arms are hinged to the two ends of the steering knuckles respectively. The steering angle measuring assembly is arranged at one end of the steering arm, the steering angle measuring assembly is used for measuring the steering angle of the steering arm, and the steering angle measuring assembly comprises a hinge shaft fixedly connected to the middle of one end of the steering arm. According to the utility model, the steering arm drives the articulated shaft to move, so that the articulated shaft is matched with the sleeve through the first threaded pipe to release or stretch the traction rope, at the moment, the pull rope displacement sensor detects the released or stretched length of the traction rope, and the rotation angle of the steering arm and the steering knuckle is obtained through measurement, thereby completing the feedback of the steering state of the hub. Accurate feedback of the steering angle of the hub is achieved, and therefore a user can conveniently and accurately control running of the unmanned mining dump truck.

The invention relates to a piston-cylinder unit. The piston-cylinder unit has a piston motion sensor which is arranged in a transverse hole of a cylinder head having a longitudinal axis. According to the invention, the piston motion sensor is detachably connected to a housing plug through a sensor cable. The housing plug is L-shaped. One leg of the housing plug extends in the transverse hole of the cylinder head, while another leg extends lying externally from the cylinder head. The invention enables the operation of the piston-cylinder unit with housing plugs of different types.The piston-cylinder unit according to the invention finds, for example, use for a work machine, construction machine, agricultural machine, maritime machine, wheel loader, excavator, dumper, crane, forklift or lifting platform.

A pure electric mining dump truck hydraulic system comprises a hydraulic steering system and a hydraulic lifting system, and the hydraulic steering system comprises a steering plunger pump, an energy accumulator, a multi-way valve assembly, a steering valve, a two-way unloading valve, a steering cylinder and an electromagnetic reversing valve; the lifting system comprises a gear pump, an overflow valve, a lifting valve, an oil suction filter, a lifting control handle, a pilot valve block, a bounce valve, a lifting cylinder and a lifting hydraulic oil tank. And the steering plunger pump and the lifting plunger pump are driven by a double-shaft extension motor. A single motor can drive the two hydraulic systems to operate stably, space is saved, meanwhile, jamming and preparation time of the two systems during operation and switching are shortened, energy is saved, and efficiency is improved.

The invention discloses an electro-hydraulic proportional lifting control device for a mining dump truck. The electro-hydraulic proportional lifting control device comprises a hydraulic oil tank, a first oil suction filter screen, a lifting oil pump, a lifting valve group, a left lifting oil cylinder, a right lifting oil cylinder, a second oil suction filter screen and a control oil pump. The invention discloses a using method of an electric-hydraulic proportional lifting control device of a mining dump truck. The operation mode of the main lifting valve is controlled by the pilot proportional valve, the impact force of the lifting action on the lifting oil cylinder and the frame is effectively reduced, meanwhile, the pressure set value of an outlet of the lifting oil pump is changed along with the load pressure, the front-back pressure difference of the main lifting valve is kept at a constant value, the stability of the carriage lifting speed is improved, and the safety of the carriage is guaranteed. The energy loss of the lifting system is effectively reduced, and the operation economy of the vehicle is improved.

The utility model discloses a steering tie rod with limiting blocks, a hinge assembly and a mining dump truck. The steering tie rod comprises a tie rod connector and a pair of limiting blocks. The tie rod connector is a C-shaped connector and comprises an upper plate and a lower plate, and the outer side end of the upper plate and the outer side end of the lower plate are each provided with a reaming hole which is coaxially formed. A pair of limiting blocks are symmetrically fixed to the two parallel side faces, close to the reamed holes, of the upper plate, and the bottom ends of the limiting blocks extend downwards by a preset length from the lower surface of the upper plate and are used for making contact with a steering rocker arm or a steering knuckle arm hinged to the transverse pull rod connector. The two limiting blocks are used for limiting rotation and movement of the steering tie rod, collision between the steering tie rod and a steering rocker arm or a steering knuckle arm is avoided, deformation and noise are reduced, the service life of a steering system is prolonged, and therefore the driving experience of a driver is improved, and the reliability and safety of the mining dump truck are improved.

The invention discloses a drive-by-wire steering system of a mining dump truck. The drive-by-wire steering system comprises a touch feedback device, a steering control valve, a steering mechanism, a steering angle sensor, a vehicle speed sensor and a controller. The touch feedback device is arranged on the lower portion of the steering wheel, connected with the controller through a CAN bus and used for detecting the rotation angle of the steering wheel and sending a generated rotation angle signal to the controller; the steering control valve is connected with the signal input end of the steering mechanism through a signal line and connected with the controller through a CAN bus, and an output port of the steering control valve is connected with the steering mechanism through a pipeline, receives control signals of the controller and outputs hydraulic flow to the steering mechanism. And the controller forms a control signal according to the deflection angle signal and the driving speed signal. The invention further discloses a mining dump truck and a steer-by-wire method. A hydraulic physical pipeline between the steering wheel and the steering valve is omitted, and steering is achieved in a drive-by-wire mode.

According to the pure electric underground dumper power assembly suspension structure, a dumper power assembly comprises a traction motor and a gearbox, the gearbox is connected with a dumper frame through a first suspension mechanism, and the traction motor is connected with the dumper frame through a second suspension mechanism; the first suspension mechanism comprises first frame end mounting seats fixed to the inner sides of frame edge beams on the two sides of the gearbox and a first equipment end mounting seat arranged between the first frame end mounting seats on the two sides. The second suspension mechanism comprises second equipment end mounting seats fixed to the two sides of the traction motor respectively and second frame end mounting seats fixed to the inner sides of the two frame edge beams respectively, the second equipment end mounting seats correspond to the second frame end mounting seats, and second vibration reduction assemblies are arranged between the second equipment end mounting seats and the second frame end mounting seats. The mounting seat is simple and reliable in structure, convenient to mount and high in space utilization rate; each supporting point of the power assembly is provided with an anti-vibration pad, vibration can be effectively isolated, and the torsional vibration influence of the power assembly is reduced.

The utility model provides a mining dump truck steering mechanism which comprises a front axle steering assembly and a hydraulic system and further comprises a rear wheel steering assembly arranged on a rear axle, the rear wheel steering assembly comprises a rear steering knuckle and a rear steering driving mechanism, and the rear steering driving mechanism is hinged to the rear steering knuckle. The two ends of the rear axle are connected with the rear knuckle through a steering fork, and a transmission universal shaft in power connection with the rear axle driving shaft and the rear brake drum is arranged in the middle of the steering fork. The rear steering driving mechanism serves as a power source for steering of the rear wheels, the transmission universal shaft penetrating through one end of the steering fork and connected with the rear axle driving shaft through the spline is arranged in the middle of the steering fork, connected with the rear brake drum, of the rear axle, and the steering function is added while transmission is achieved. The rear steering driving mechanism is hinged to the rear steering knuckle, so that steering of the rear wheels is achieved instead of rotation of the rear axle, abrasion of the rear wheels during steering can be greatly reduced, and the service life of tires is prolonged.

The invention provides a four-axle mining dump truck frame which comprises a front axle longitudinal beam, a rear axle longitudinal beam and a cross beam assembly, the front axle longitudinal beam and the rear axle longitudinal beam are arranged in a bilateral symmetry mode, the cross beam assembly is used for connecting the front axle longitudinal beam and the rear axle longitudinal beam, and the cross beam assembly comprises a U-shaped cast beam, a two-axle cross beam assembly, a three-axle cross beam assembly and a four-axle cross beam assembly; the rear axle longitudinal beam comprises a second axle longitudinal beam, a third axle longitudinal beam and a fourth axle longitudinal beam; the second-bridge longitudinal beam and the third-bridge longitudinal beam are fixedly connected through a second-bridge cross beam assembly; the third-bridge longitudinal beam and the fourth-bridge longitudinal beam are fixedly connected through a third-bridge cross beam assembly; the four-bridge cross beam assembly is fixedly connected with the end, away from the three-bridge cross beam assembly, of the four-bridge longitudinal beam. By arranging the four-axle longitudinal beams and the four-axle cross beam assemblies, an installation foundation is provided for achieving the four-axle mining dump truck, all the axle longitudinal beams are fixedly connected into a whole through the cross beam assemblies, operation is easier during production and manufacturing, the truck frame assembling time is saved, the production cycle of all the components is shorter, and the production efficiency of the four-axle truck frame is greatly improved.

The utility model discloses an integrated power assembly suspension system of an off-highway dumper, which is horizontally arranged and comprises an engine suspension structure, a pair of first connecting pieces, a pair of second connecting pieces, a pair of third connecting pieces, a pair of fourth connecting pieces and a pair of fourth connecting pieces, and the first connecting pieces are symmetrically arranged on two sides of a central surface of an engine flywheel casing in the width direction of a power assembly; the left side and the right side of the front end of the engine are connected with the left frame and the right frame respectively; the gearbox suspension structure comprises a pair of second connecting pieces which are symmetrically arranged on the two sides of the center face of the engine flywheel shell in the width direction of the power assembly, and the left side and the right side of the rear end of the engine and the left side and the right side of the rear end of the gearbox are connected and then connected with the left frame and the right frame. The four-point type suspension system has excellent vibration damping performance, simultaneously avoids stress damage of a flywheel casing caused by insufficient support of a traditional four-point type suspension system on the premise of a large-torque power assembly, thoroughly solves the problem of difficulty in assembly and maintenance, and realizes that a power assembly system can still keep away from an upper wing surface of a frame in a limited frame space. And integrated hoisting and dismounting are completed.

The utility model discloses a safe and quick unloading container of an off-highway dump truck, which relates to the technical field of off-highway dump trucks and comprises a container body, the bottom of the container body is fixed on a frame, a container door is mounted at the tail of the container body, and the container door is opened and closed through a driving device. Wherein the bottom of the container body is arranged in an up-down through mode, and a conveying device used for conveying materials in the container body is installed at the through position of the container body. The container door is driven to be opened and closed through the hydraulic oil cylinder, when discharging is needed, the motor is started to drive the conveying belt on the driving wheel to convey and discharge materials in the container to the tail of the container body, and the problems that in the prior art, when the materials are dumped, the container body needs to be lifted, and the materials cannot be dumped are solved. Therefore, potential safety hazards caused by backward movement and overturning of the gravity center are avoided, and stability is improved.

A wheel edge driving system of an electric mining dump truck comprises a gearbox and a planet row which is arranged on the periphery of the gearbox and fixed to a driving wheel. The multi-motor input assembly is used for dynamically coupling the three motors, the first gear shifting assembly has a two-gear speed changing function and is connected with the first multi-motor input assembly, the output shaft is used for transmitting power to the planet row, the second gear shifting assembly is assembled on the output shaft, and the output shaft is connected with the input end of the planet row. The output shaft is in transmission connection with the first multi-motor input assembly along with gear shifting of the second gear shifting assembly or is in transmission connection with the first gear shifting assembly along with gear shifting of the first gear shifting assembly. The complex terrain adaptability is improved, the power requirements of various working conditions are met, switching between a low-speed large torque mode and a high-speed energy-saving mode is achieved, and the optimal matching of the dynamic property and economical efficiency of the whole vehicle is achieved. The invention further provides a gear shifting driving method of the wheel edge driving system of the electric mining dump truck and the electric mining dump truck.

The invention provides a mining electric locomotive group. The mining electric locomotive group comprises a control electric locomotive, a dumper, an electric transmission system and a power reconnection device, the control electric locomotive is provided with a control system, a first traction motor and a first bogie; the control system can control the first traction motor; the first bogie is a power bogie and is driven by a first traction motor; the dumper is provided with a second traction motor and a second bogie, and the second bogie is a bogie with power and is driven by the second traction motor; the electric transmission system is arranged on the control electric locomotive and is connected to the second traction motor; the electric locomotive is controlled to receive pantograph net power supply and supply power to the second traction motor through the electric transmission system; the power reconnection device is connected to the control electric locomotive and the dumper and comprises a reconnection connector, and the reconnection connector is connected with the control system, the electric transmission system and the second traction motor; the control system and the electric transmission system can respectively transmit electric energy and control signals to the second traction motor through the reconnection connector.

The invention discloses a mining dump truck weighing system, method and equipment and a storage medium, and relates to the field of mining vehicles. Comprising a main controller used for obtaining driving information of a mining dump truck and pressure data of a container, converting the pressure data into weight information when the driving information meets a preset condition, determining an overload condition of the weight information, generating a torque limiting control message according to the weight information when the overload condition is overload, and sending the torque limiting control message to a server; the torque limiting control message is sent to an engine controller; and the engine controller is used for receiving the torque limiting control message and limiting the torque according to the torque limiting control message. The main controller can determine the weight information and limit the torque of the engine through the torque limiting control message during overload, so that the running risk of the vehicle is reduced, and the safety in the mine transportation process is guaranteed. When the driving information meets the conditions, weight conversion and overload judgment are carried out immediately, real-time monitoring is achieved, the overload condition can be found in time, and measures can be taken quickly.

The invention belongs to the technical field of vehicle steering systems, and discloses a servo steering system and a dumper. The servo steering system comprises a steering device, a transmission mechanism, an execution unit and a feedback mechanism, wherein the transmission mechanism is connected with the steering device; the execution unit comprises a pilot valve, a steering valve and a steering oil cylinder, the pilot valve is connected with the transmission mechanism, the transmission mechanism can drive a valve element of the pilot valve to move so as to convey pilot oil to the steering valve, the steering valve is used for controlling the steering oil cylinder, and the steering oil cylinder is connected with a bogie of the vehicle; the execution unit has a steering state and a balance state, when the execution unit is in the steering state, the pilot valve conveys pilot oil to the steering valve so that the steering valve can control the steering oil cylinder to act to drive the bogie to rotate, and when the execution unit is in the balance state, the pilot valve stops conveying the pilot oil to the steering valve, and the steering oil cylinder stops acting. The servo steering system is simple in structure, flexible in arrangement, low in manufacturing cost and capable of improving the driving experience of a driver.

The invention discloses a mine road intelligent maintenance system for multi-source sensing of a mining dump truck. The mine road intelligent maintenance system comprises a mine car sensor array, an edge computing unit and an equipment collaboration network, the mine car sensor array, the edge computing unit and the equipment collaborative network are in signal connection in sequence; the mine car sensor array is used for collecting whole car and road data and comprises a load sensor, a six-axis IMU, a laser radar, a binocular vision sensor and a vibration sensor. According to the invention, real-time monitoring and dynamic maintenance of the mine road state are realized, and a manual inspection blind area is effectively eliminated. The accuracy of road degradation identification is improved through multi-dimensional data fusion, and resource waste caused by misjudgment is avoided. And an equipment cooperation mechanism solves the conflict problem of maintenance operation and transportation tasks, and the road use efficiency is remarkably improved. The edge computing architecture reduces the data transmission load, and ensures the stable operation of the system under a complex working condition.

The utility model discloses a brake hydraulic element fault detection system and a mining dump truck. The brake hydraulic element fault detection system comprises an oil tank, a variable pump, a pedal valve, a relay valve, an angle sensor, a controller, a brake and a pressure sensor. The oil tank is used for storing hydraulic oil; the variable pump is connected with the oil tank, serves as a hydraulic system oil source and outputs hydraulic oil outwards; the pedal valve and the relay valve are respectively connected with the variable pump; the pedal valve outputs pressure oil which is proportional to a pedal angle to a pilot port of the relay valve; the angle sensor mounted on the pedal is used for sending the detected angle of the treaded pedal to the controller; the brake is connected with the relay valve, and the relay valve outputs pressure oil proportional to the pressure of the pilot port to the brake; the pressure sensor is electrically connected with the controller and sends the detected pressure of the brake to the controller, and the controller judges whether the pedal valve and the relay valve break down or not by analyzing the angle of the pedal valve and the pressure of the brake.

The invention discloses a four-wheel steering mining dump truck. The four-wheel steering mining dump truck comprises a steering mechanism, a steering hydraulic system, a driving wheel assembly and a frame, the frame is provided with a front axle and a rear axle, the front axle and the rear axle are respectively provided with two driving wheel assemblies, the two driving wheel assemblies of the front axle are connected and mounted on a steering mechanism of the front axle, the two driving wheel assemblies of the rear axle are connected and mounted on a steering mechanism of the rear axle, and a steering wheel of each driving wheel assembly participates in steering; the front axle and the rear axle are respectively provided with an axle support, the frame is provided with a frame support, and the steering mechanism comprises a steering crank, a steering pull rod, a steering arm, a steering cylinder and a steering support; the steering hydraulic system is used for providing pressure oil for the steering cylinder and pushing the telescopic rod to stretch out or retract back. The invention further discloses a steering method of the four-wheel steering mining dump truck. The four-wheel steering electric vehicle has a four-wheel steering function, so that the turning radius of the whole vehicle is smaller, and the vehicle can adapt to a narrower road environment.

The utility model discloses a foldable auxiliary seat, a cab and a mining dump truck. The foldable auxiliary seat comprises a supporting seat, a connecting seat and a fixing seat, the supporting base is provided with a connecting point V located at the bottom and a sliding rail located in the middle. Two ends of the connecting seat are respectively provided with a connecting point I and a connecting point II; the connecting point I and the connecting point V are connected to form a first hinge point; the fixing base is provided with a connecting point III located in the middle and a connecting point IV located at the tail, the connecting point III and the connecting point II are connected to form a second hinge point, and the connecting point IV and the sliding rail are used in cooperation to form a sliding point; when the connecting point IV moves to the lower end point of the sliding rail, the connecting seat is locked to be in a horizontal state; when the connecting point IV moves upwards, the connecting base turns downwards to be gradually close to the supporting base, and when the connecting point IV moves to the starting point of the upper portion of the sliding rail, the connecting base, the fixing base and the supporting base are folded together. The utility model has the characteristics of simple structure, space saving and convenience in use.

We provide an electric dump vehicle that can utilize the space above the battery. [Solution] The electric dump vehicle comprises a vehicle body having a vehicle frame and wheels, a cargo bed positioned on the vehicle frame, a dumping device that moves the cargo bed relative to the vehicle body between a reference position on the vehicle body and a dumping position inclined relative to the vehicle body, a motor that rotates the wheels, and a battery fixed to the vehicle frame that supplies power to the motor. The dumping device comprises an extendable and retractable hydraulic cylinder and a hydraulic drive device that extends and retracts the hydraulic cylinder in order to move the cargo bed relative to the vehicle frame. At least a portion of the battery is positioned below the vehicle frame, and at least a portion of the hydraulic drive device overlaps with the battery in an up-down view and with the vehicle frame in a side view.

A control system controls lift axles of an articulated dump truck to lower a designated lift axle when it senses the designated lift axle is in a raised position and the dump truck bed is at least partially raised. The designated lift axle is the lift axle closest to where a hydraulic piston that raises the bed connects to the dump truck frame. In one aspect, the control system additionally senses the weight of the dump truck bed (or a proxy, such as hydraulic pressure in the piston raising the bed), and only lowers the designated lift axle if the weight exceeds a predetermined threshold. Lowering the designated steer lift axle provides the full axle length (e.g., up to 8 feet) of lateral stability at the point of application of the much of the load weight to the frame. This reduces torque on the frame, and may prevent torque damage.

A computerized control system controls a hydraulic subsystem of an articulated dump truck. Among other possible equipment, the hydraulic subsystem controls the raising and lowering of the dump truck bed. The control system detects the speed of the dump truck. Upon the dump truck traveling at or above a predetermined speed, the control system controls the hydraulic subsystem to automatically lower the dump truck bed. In various aspects, the predetermined speed may be preprogrammed, may be programmable by the truck operator, or may be programmable only by certain personnel (e.g., changing the speed may require entry of a password). In one aspect, a manual override switch prevents automatic lowering of the dump truck bed when the dump truck travels at or above the predetermined speed. In one aspect, the switch is a “dead man” switch, requiring continuous activation to prevent the automatic lowering.