Abstract: The present disclosure provides a modular excavator, including a plurality of assembly modules that are detachably connected, the plurality of assembly modules including: a frame turntable base module; a track beam assembly module connected to the frame turntable base module; a track module connected to the track beam assembly module; a slewing drive module connected to the frame turntable base module; a power assembly module connected to the frame turntable base module; a counterweight module connected to the power assembly module; a cab module connected to the frame turntable base module; a fuel tank module connected to the frame turntable base module; a boom assembly module connected to the frame turntable base module; a bucket arm assembly module connected to the boom assembly module; and a work tool module connected to the bucket arm assembly module.

Abstract: A grader and slope scraping control method and device include a grader having a front frame; a blade mounted on the front frame, an attitude of the blade is adjustable; an actuator for adjusting the attitude of the blade; a first angle detecting member for detecting a first inclination angle in a front and rear direction of the grader relative to a horizontal plane and a second inclination angle in a left and right direction relative to a horizontal plane; a blade detecting member for detecting attitude information of the blade relative to the front frame; and a controller, for obtaining an actual slope angle based on the first inclination angle, second inclination angle and attitude information, and make the actuator adjust attitude of the blade to a target slope angle when the actual slope angle is inconsistent with the preset target slope angle.

Abstract: The present disclosure relates to a backhoe loader for efficient digging. The backhoe loader includes: a vehicle body, including a first vehicle body and a second vehicle body which are connected sequentially; a loading device, arranged on the first vehicle body; a control platform, arranged on the second vehicle body and configured to rotate by 360° relative to the second vehicle body; a cab, arranged on a first side of the control platform; and an excavating device, arranged on a second side of the control platform opposite to the first side, the excavating device being configured to rotate by 180° relative to the cab. The backhoe loader can realize functions of 360° excavating and bidirectional driving. When the excavating device works, the backhoe loader can be directly moved by folding stabilizers and without changing the position of a seat back and forth, so that the excavating efficiency is improved.

Abstract: The present invention discloses a molten salt ultrasonic cleaning machine. The molten salt ultrasonic cleaning machine includes a tank body, a molten salt heating system, an ultrasonic application system and a stirring system, wherein the tank body is configured to accommodate molten salt and a to-be-cleaned workpiece; the tank body includes a bottom wall, and a side wall arranged circumferentially in a surrounding way; the molten salt heating system is configured to heat the molten salt in the tank body; the ultrasonic application system is configured to apply ultrasonic impact to the to-be-cleaned workpiece in the tank body; and the stirring system includes a stirring rod which is rotatably arranged in the tank body. When the molten salt ultrasonic cleaning machine provided by the present invention cleans a workpiece, the stirring rod rotates to improve the flowability of the molten salt.

Abstract: The present disclosure relates to a leveling control method, device and system, a motor grader. The leveling control method includes: acquiring elevations of a current position of a blade of a motor grader and a target position, and a movement speed of the motor grader, wherein the target position is on the ground with a certain horizontal distance from the current position along a movement direction of the motor grader; determining a movement time of the blade from the current position to the target position from the horizontal distance and the movement speed; determining a lifting speed of a lifting cylinder from an elevation difference between the elevation of the target position and the elevation of the current position and the movement time; and controlling the lifting cylinder to adjust the blade to move from the current position to the target position according to the lifting speed.

Abstract: A hub directly driven by a motor and used for a heavy-duty chassis dynamometer includes a hub body, wherein a mounting surface is arranged on an inner circumference of the hub body and is disposed around a transmission shaft coaxial with the hub body, the transmission shaft is sleeved with a driving assembly, and bearing assemblies are disposed on two sides of the driving assembly in an axial direction respectively; a plurality of axial mounting plates are disposed on an outer circumference of the driving assembly, and tension sensor assemblies are connected to the axial mounting plates located outside the hub body and are mounted on the support frame; and an end, away from the mounting surface, of the transmission shaft, is sleeved with an end flange plate, and a plurality of brake assemblies are disposed on the end flange plate and are mounted on the support frame.

Abstract: A heavy-duty, high-power and large-torque chassis dynamometer for a multi-environmental system, comprising a power testing platform disposed on the ground and a rack located below the power testing platform. A fixed base and a sliding base are sequentially disposed on an inner side of the rack in a length direction of the power testing platform, a pair of first hub assemblies are mounted on the fixed base through a plurality of support frames, a sliding platform is disposed on the sliding base, and a pair of second hub assemblies are mounted on the sliding platform through a plurality of support frames. Tension sensor assemblies are connected to outer circumferences of the first hub assemblies and outer circumferences of the second hub assemblies, and are fixedly disposed on the support frames.

Abstract: A cab frame includes a support framework, where the support framework includes a bottom frame, a top frame, and a four-upright-column structure supported between the bottom frame and the top frame; the four-upright-column structure includes two front upright columns and two rear upright columns, and an inner dimension of the cab frame increases along the bottom-to-top direction.

Abstract: A method and system of casting an integral multi-way valve based on 3D printing belong to the technical field of valve casting. The casting method and system determine, according to structural parameters of an integral multi-way valve to be cast, a plurality of ingates on a plurality of layers, a plurality of runners connecting the ingates on each layer, and a sprue connecting the plurality of runners, and an integral sand mold is printed by using the 3D printing technology to realize a multi-layer composite casting method and a corresponding casting system.

Abstract: A device for detecting the elongation of a hydraulic cylinder includes an electric signal conversion device, a ruler and a positional magnetic ring. The electric signal conversion device is disposed at the bottom of a cylinder barrel. The ruler has an end fixedly connected to the electric signal conversion device, as well as the other end movably extending into a piston rod. The positional magnetic ring is fixedly connected to a piston and the positional magnetic is movably disposed around the periphery of the ruler. When the positional magnetic ring is located at different positions of the ruler, different circuits are turned on to transmit a voltage or current signal corresponding to the positions of the ruler to the electric signal conversion device, so as to obtain a position of the positional magnetic ring on the ruler, such that the elongation of the piston rod is obtained.

Abstract: A wheeled engineering vehicle includes a frame; a first telescopic cylinder disposed on the frame; and a stabilizer assembly connected with the first telescopic cylinder and configured to rotate relative to the frame under drive of the first telescopic cylinder. The stabilizer assembly includes: a first stabilizer leg having a hollow structure; a second telescopic cylinder disposed in the first stabilizer leg; a second stabilizer leg configured to extend or retract relative to the first stabilizer leg under drive of the second telescopic cylinder, and the first stabilizer leg configured to radially limit the second stabilizer leg; and a stabilizer foot connected to the second end of the second stabilizer leg and configured to be in contact with the ground to support the vehicle. The first stabilizer leg, the second stabilizer leg and the stabilizer foot cooperate to support the whole vehicle to improve the stability of the vehicle.

Abstract: A device, optimization method and system for cooperative matching of heat dissipation and noise are disclosed. A hood is mounted on a base, and a power device, a fan and a radiator are mounted in the hood; an output shaft of the power device is fixedly connected to a rotary shaft of the fan through a bearing pedestal to drive the fan to rotate, and the bearing pedestal is fixed on the base; the radiator is fixed on a radiator support, and a lead screw assembly is disposed on the base, and is used for changing the relative distance between the radiator and the fan; and a fan cover is mounted on a side, facing the fan, of the radiator, and a plurality of anemographs are disposed on the other side of the radiator, and a plurality of microphones are symmetrically disposed on two sides of the fan.

Abstract: A rollover alarming system, a rollover risk prediction method, and a rollover alarming method. An axle housing strain measurement unit measures strain values on both sides of an axle housing of a vehicle body. A roll angle measurement unit measures a roll angle of the vehicle body. A collection control unit is configured to collect the strain values on both sides of the axle housing of the vehicle body and the roll angle of the vehicle body, calculate a strain difference between the strain values according to the strain values on both sides of the axle housing of the vehicle body, and output a corresponding alarm control signal according to the strain difference between both sides of the axle housing of the vehicle body and the roll angle of the vehicle body. An alarm unit is configured to output a corresponding alarm signal according to the received alarm control signal.

Abstract: A modular design gearbox and a gear implementation method are provided. The gearbox includes a body, a drive shaft, four intermediate shafts, and an output shaft. The gearbox is of a six-shaft layout. The drive shaft S1, the intermediate shaft S4 and the intermediate shaft S5 are each provided with two clutch packs, and the intermediate shaft S2 is provided with one clutch pack. According to such a structure, a transmission path is short, and stability is better. By means of six shafts and seven clutches, the gearbox achieves a mode of up to eight forward gears and four backward gears, a speed ratio range is wide, and the gearbox can be adjusted flexibly, a less-gear mode can be achieved by reducing some of components, modularization is achieved, universality is improved, and the production cost and use cost of the gearbox are reduced.

Abstract: The present disclosure discloses a rotary frame and a grader, and relates to the field of a grader. The rotary frame includes: a rotary ring, provided with a recessed portion and an opening; a first connecting piece fixed at the periphery of the rotary ring, one end of the first connecting piece being attached to the periphery of the rotary ring and the other end of the first connecting piece being separated from the periphery of the rotary ring; a second connecting piece, the second connecting piece being also fixed at the periphery of the rotary ring, and one end of the second connecting piece being attached to the periphery of the rotary ring and the other end of the second connecting piece being separated from the periphery of the rotary ring; a supporting base fixed on an inner wall of the rotary ring and located in the recessed portion.

Abstract: The present disclosure provides a steering system of an engineering vehicle, and a backhoe loader. The steering system includes: a direction control device, including a steering wheel, a steering cylinder and steerable wheels, the steering cylinder being in transmission connection with the steering wheel and the steerable wheels; a displacement sensor configured to detect a piston displacement of the steering cylinder; a return motor in transmission connection with the steerable wheels to drive the steerable wheels to return to a normal position; and a controller in signal connection with the displacement sensor and the return motor, and configured to output a control signal according to the piston displacement detected by the displacement sensor to manipulate the return motor to drive the steerable wheels to return. The backhoe loader includes the steering system.

Abstract: The present disclosure relates to a method and system for measuring and calibrating steering parameters of a vehicle, a medium and an autonomous vehicle. The method includes: calculating a steering angle of a front wheel of the vehicle corresponding to each sampling moment at a plurality of consecutive sampling moments respectively. The calculation process at each sampling moment includes: calculating a first calculated value based on a yaw velocity of the vehicle, a vehicle velocity and a wheelbase; calculating a second calculated value based on a vehicle velocity, a lateral acceleration of the vehicle and the wheelbase; calculating a third calculated value based on a rotating angle of the steering wheel and a steering gear ratio; and calculating a steering angle of the front wheel at a current sampling moment based on the first, second and third calculated value of the steering angle of the front wheel.