1665 results about "Mechanism (engineering)" patented technology

The invention discloses an engineering machine and a telescopic arm. The telescopic arm comprises a telescopic cylinder, a multi-section arm, a hydraulic system, at least one mechanical limit mechanism, a controller and a position sensor, wherein the movable end of the telescopic cylinder is telescopic in the extending direction of the telescopic arm; the hydraulic system is connected with the telescopic cylinder through a hydraulic oil circuit; the mechanical limit mechanism is matched with the movable end of the telescopic cylinder; the position sensor corresponds to the mechanical limit mechanism and is used for detecting the position of the movable end of the telescopic cylinder; and the controller outputs a control signal to a proportional control valve according to a predetermined strategy, so that the speed of the movable end of the telescopic cylinder is reduced. Through the technical scheme, the telescopic speed of the telescopic cylinder can be reduced according to the control signal, and the speed of the movable end is reduced to a low value or the movable end just stops at a position corresponding to the mechanical limit mechanism when the movable end arrives at the corresponding mechanical limit mechanism, so that collision impact between the movable end and the mechanical limit mechanism can be reduced or avoided.

The invention discloses a method for analyzing swing high-speed jet characteristics of an underwater engine nozzle, and belongs to the field of fluid mechanical engineering. The implementation methodcomprises the following steps of: through establishing a geometric model of an underwater solid rocket engine nozzle, establishing a fluid calculation domain, carrying out geometric optimization on aninterface of the two fluid calculation domains, setting an interface between the calculation domains for data transmission to achieve simulation of the swing working condition of the nozzle, carryingout grid division on the fluid domains in a partitioned mode, carrying out grid independence verification, and obtaining the optimal grid number; importing the obtained final grid file into a FLUENTsolver, setting boundary conditions, an adopted calculation model and a calculation method, and carrying out solving; carrying out numerical simulation analysis and post-processing on a numerical calculation result. The rocket engine nozzle swing high-speed jet flow characteristic is accurately simulated and analyzed, the nozzle swing high-speed jet flow rule and mechanism can be easily disclosed,a theoretical basis is provided for the engine nozzle structure design of underwater powered missile launching, and the actual engineering application problem of underwater powered missile launchingis solved.

The invention relates to a tunnel engineering machine, in particular to a movable automatic horizontal positioning detection arm for a tunnel. The movable automatic horizontal positioning detection arm consists of a detection instrument, a protection bracket, a damping arm, a rigid retractable arm, an enclosure, a transverse rotating driving mechanism, a height increase control bracket, a horizontal target positioning control bracket and a power drive source. The movable automatic horizontal positioning detection arm is characterized in that the protection bracket consists of four groups of triangular wheels, a protection shell and a connecting bracket, and the damping arm guarantees that the triangular wheels are attached onto a tunnel lining surface to enable the transverse surface and the longitudinal surface of a radar antenna and the tunnel lining surface are always on the same level. The movable automatic horizontal positioning detection arm for the tunnel has the advantages that the detection arm can be installed on an automobile or other walking mechanisms to adapt to different road surfaces, more importantly, the detection arm can detect the tunnel lining surface on the road surface under construction, the stability of detection quality is guaranteed, the detection quality is improved, the labor intensity of people is relieved and the efficiency is improved.

The invention discloses a synchronous control device of revolving speed of a hydraulic walking mechanism engine and discharge of a main pump, belonging to the filed of mine and engineering machinery. The synchronous control device comprises a proportional pressure reducing valve, a main pump servo valve and an accelerator control cylinder, wherein a valve block is arranged between the proportional pressure reducing valve and the main pump servo valve; a shuttle valve and two throttle plugs are embedded into the pressure reducing valve. Two ends of the shuttle valve are respectively connected between an output port A and an output port B of the proportional pressure reducing valve. The proportional pressure reducing valve controls the servo valve of a variable pump through a throttle plug hole; an output pressure signal of the proportional pressure reducing valve at the left side or the right side is output to the accelerator control cylinder through the output port of the shuttle valve to control the stroke of an oil cylinder so as to control an accelerator of the engine. The synchronous control device disclosed by the invention has the advantages that a motor car can be operated to move forwards or backwards or to change speed by operating a discharge handle of the pump only; the revolving speed of the engine is automatically adjusted to match with the power requirement of the pump while the variable of the pump is controlled, and therefore the problem that the engine is suffocated and switched off due to mismatching between the discharge of the pump and the accelerator of the engine during starting the motor car can be prevented.

The invention relates to the technical field of vehicle engineering, and provides a Mecanum electric wheel and an omnibearing mobile platform. The Mecanum electric wheel comprises a rotating mechanism and multiple Mecanum components. The rotating mechanism comprises a stator part and a rotor part which can coaxially rotate relative to the stator part. All the Mecanum components are equidistantly and circumferentially arranged outside the side wall of the rotor part in a surrounding way with the rotating shaft of the stator part acting as the center. All the Mecanum components are fixedly connected on the rotor part. According to the Mecanum electric wheel, the whole structure is simple and the conventional wheel hub structure is replaced by the rotating mechanism so that the number of parts of the whole electric wheel can be reduced, and the matching precision required for the stator part and the rotor part is low and thus the Mecanum electric wheel is more suitable for production and processing.

The invention discloses a wet spraying machine with a sliding foldable arm. The wet spraying machine comprises a frame, a driving cab is arranged on the frame in a left offset manner, a power system is arranged below the frame, an electric control system, an external additive system, a hydraulic system, an air pressure system and a pumping system which is connected with the frame are arranged above the frame, an engineering mechanical chassis is arranged on the frame on the right side of the driving cab, a sliding foldable arm support is arranged on the engineering mechanical chassis, the lower portion of the sliding foldable arm support is connected with a sliding base through bolts, a travelling mechanism is arranged below the sliding base and on a guide rail, and the guide rail is fixed on the frame. By the aid of the wet spraying machine with the sliding foldable arm, one slide, two rotations, four folding and one extension are realized, multidirectional control is realized, dead working angles are eliminated, construction quantity is improved, spraying area is enlarged, labor intensity of workers is reduced since the workers control the spraying device by controlling an operation panel, dust concentration is lowered, and risks to health of construction workers are reduced.

The invention aims to provide a cable laying device for electric power engineering construction and a use method thereof. The cable laying device comprises a cable rack and a tractor; the tractor comprises a driving wheel and a driven wheel, a belt is wound between the driving wheel and the driven wheel, a gear is fixed in the axis direction of the driving wheel, an adjusting base is fixed at thebottom of the gear, a mounting base is arranged below the adjusting base, at least four retractable rods are hinged between the adjusting base and the mounting base, an adjusting rod is hinged to oneretractable rod, a horizontally-arranged screw rod is rotationally connected into the mounting base, the end, away from the retracting rods, of the adjusting rod is in threaded connection with the screw rod, a driving mechanism for automatically driving the screw rod to rotate is fixedly mounted at the end part of the screw rod, and the driving wheel is slidably connected to the mounting base. According to the cable laying device for electric power engineering construction and the use method thereof, the problem that when cables are laid in a pipeline, due to improper traction control, the belt is prone to looseness is solved. The device has the effects of automatically adjusting the belt when the belt is loosened, reducing the conditions of belt deviation and failure and improving the construction efficiency.

The invention discloses a device, a method, a system and an engineering machine for controlling rotary vibration of a cantilever crane. The device comprises a receiving device and a controlling device, wherein the receiving device is used for receiving the displacement of the cantilever crane in the rotating direction, and the controlling device is used for calculating the displacement difference between the displacement and a reference displacement after rotating motion of the cantilever crane is finished and generating control signals for a vibration attenuation executing mechanism through a proportional differential algorithm according to the displacement difference. By means of the technical scheme, the control signals can be determined by detecting the displacement in the rotating direction according to the displacement difference, and then the control signals are exerted onto the vibration attenuation executing mechanism to restrain rotary vibration of the cantilever crane. The device, the method, the system and the engineering machine for controlling the rotary vibration of the cantilever crane has significant meanings in improving manipulating efficiency and safety of a pump truck.

The invention provides a distribution valve of a pumping system, which comprises a valve body. A valve cavity is positioned on the valve body, the valve body is provided with a valve a, a valve b and a valve c which are communicated with the valve cavity, a valve plug is positioned in the valve cavity, and under the action of a driving mechanism, the valve plug can seal the valve a and the valve b in alternative mode. The invention further provides a pumping system comprising the two distribution valves. By means of two valve plugs, the purpose that two delivery cylinders alternatively suck materials and pumping is achieved. The pumping system is simple in structure, reliable in distribution performance and capable of saving cost and installation space. Two sets of driving mechanisms are utilized to respectively drive the two valve plugs, thereby greatly simplifying a control system and lightening the weight of the whole machine. The invention further provides engineering machinery including the pumping system.

The invention relates to a dual-cavity semi-ring surface type power distribution continuously variable transmission which comprises a dual-cavity semi-ring surface type continuously variable unit driven by traction, an ordinary gear train, a two-degree-of-freedom differential gear train and a reversing mechanism, wherein input power is transmitted by two paths, one path of input power is transmitted to a center shaft of the differential gear train from a main shaft, the other path of input power is transmitted to a second gear of the differential gear train through the dual-cavity semi-ring surface type continuously variable unit and the ordinary gear train, and the two parts of power are output through a planet carrier after being converged at the differential gear train. The invention ensures that one part of input torque is born by a second main shaft to reduce the torque born by the dual-cavity semi-ring surface type continuously variable unit, thereby having a capacity of transmitting a large torque. In the design, odd gears in the ordinary gear train are externally meshed, thus, power distribution is realized inside a closed system, and large torque output of the differential gear train is ensured. In order to meet the requirement for advancing and recessing during the operation of engineering machinery, the reversing mechanism is arranged in the dual-cavity semi-ring surface type power distribution continuously variable transmission during the output.

The invention relates to the technical field of engineering machine measuring and control, in particular to a rotation angle measuring method, device and system and an engineering machine to improve the measuring accuracy of a rotation angle. The rotation angle measuring system comprises a rotation speed sensor used for detecting the rotation speed of a hydraulic pump, at least one proximity switch and a controller, wherein each proximity switch sends out a sensing pulse when inducing teeth of an induction gear of a rotation mechanism, and the controller is in signal connection with the hydraulic pump, the rotation speed sensor and each proximity switch and used for determining the current induction pulse count according to the rotation direction of the rotation mechanism. A rough measurement value of the rotation angle is obtained according to the current induction pulse count. The rotation speed of the induction gear is obtained according to the rotation speed of the hydraulic pump and the control currents of the hydraulic pump, the variation of the rotation angle is obtained according to the rotation speed of the induction gear and the time difference between sampling time and current induction pulse generation time, and the accurate measurement value of the rotation angle is obtained according to the rough measurement value of the rotation angle and the variation of the rotation angle.

The invention relates to an axial-flow compressor stator blade system with adjustable first and second half segments and a working method thereof and belongs to the field of mechanical technology of impellers. A single-stage stator blade is divided into a first half segment adjustable blade (1) and a second half segment adjustable blade (4). Sleeve ring structures (3) of the first and second half segment adjustable blades are connected via a connection cylinder (2). The connection cylinder (2) is arranged at the biggest thickness part of the last-stage stator blade and installed between an external casing and a stator inner ring. A stepping motor rotates so as to drive a worm, a worm wheel, a rotation ring, a cylindrical pulling block, and the first half or second half segment blade to rotate and move successively, thereby achieving adjustment of angles. Compared with the prior art, the stator blade system is advantageous in that 1) for a middle-stage stator blade, by rotating the first half segment blade, the blade is arranged at a favorable attack angle, and by rotating the second half segment blade, a rotator at the backward position of the stator is arranged at a favorable attack angle; and 2) an adjusting mechanism is simple and easy to realize in engineering.