32results about How to "Good low speed stability" patented technology

The invention relates to a multi-load hydraulic sensing system for single-power source and multi-system working, comprising a main liquid-control handle, an assistant liquid-control handle a load-sensitive variable pump, a load-sensing main steerer, a load-sensing assistant steerer, a front wheel steering oil cylinder, a back wheel steering oil cylinder, a front wheel hydraulic motor, a back wheel hydraulic motor and an operation actuating mechanism, wherein the load-sensitive variable pump is connected with a PVG multipath integrated valve, and the PVG multipath integrated valve is respectively connected with the main liquid-control handle and the assistant liquid-control handle, the front wheel steering oil cylinder and the rear wheel steering oil cylinder, and the operation actuating mechanism and also respectively connected with the load-sensing main steerer and the load-sensing assistant steerer through an anti-explosion two-position three-way electromagnetic valve; the load-sensing main steerer is connected with the front wheel steering oil cylinder, the load-sensing assistant steerer is connected with the back wheel steering oil cylinder, and the front wheel steering oil cylinder and the back wheel steering oil cylinder are connected through a three-position four-way electromagnetic valve; and a posture-adjusting valve and an anti-explosion two-position four-way electrohydraulic valve are arranged between the front wheel hydraulic motor and the back wheel hydraulic motor. The multi-load hydraulic sensing system can realize single-pump oil supply of a running system, a steering system and an operation actuating mechanism, and can also realize electric explosion prevention, two-way driving and all-around steering of the hydraulic system.

The invention relates to an azimuth rotation static-pressure support system of a tower solar thermal power generation heliostat. The tower solar thermal power generation heliostat includes a tower frame, a hydraulic motor speed reducer, an azimuth rotating unit and a pitching motion unit. The system designs chute and slide ring structures, and injects oil to the lower bottom end surface of a slide ring and the upper flat end surface of a chute through a pressure reducing valve, a one-way valve and a capillary throttling valve, so that the lubricating performance is greatly improved, the rotating torque of the tower heliostat azimuth is reduced by 70% compared with the torque of a mechanical drive, the azimuth rotation driving torque is largely reduced, the sizes of the driving device and the hydraulic motor are both largely reduced, and the cost of the azimuth driving device is correspondingly reduced.

The great-tonnage low-speed tractor includes chassis with front drive axle, back drive axle, driver cab and engine, the engine is connected via hydraulic torque converter to gear box, the gear box isconnected to front and back drive axles via the transmission shaft, and the chassis includes the front chassis and the back chassis hinged together. The tractor has high low speed stability, good heavy load starting characteristic, smooth gear shift, all-wheel drive, great traction, disc brack suitable for frequency braking, light and flexible steering and small turn radius. It is suitable for iron and steel works and other enterprise to perform low-speed short-distance great-tonnage transportation in narrow space.

The invention discloses a movable plasma sterilizer, and belongs to the technical field of disinfection and sterilization devices. The movable plasma sterilizer comprises a mounting shell, wherein a mounting base is fixedly connected to the bottom end of the mounting shell, universal wheels are fixedly mounted at the front end of the bottom face of the mounting base, driving wheels are fixedly mounted at the rear end of the bottom face of the mounting base, falling sensors are fixedly connected to the side wall and the front wall face of the mounting base, and the front wall surface of the mounting base is also fixedly connected with an ultrasonic sensor; a power interface is embedded in the rear wall surface of the mounting base, and the power interface is electrically connected with the battery pack. The problems that in an existing design, only air sterilization work can be carried out at a fixed point, and effective air purification and germ sterilization effects cannot be carried out on air in places with large people flow, dense people and large space are effectively solved.

The invention relates to a valve-pump combined multi-mode hydraulic control system and a control method thereof. The multi-mode hydraulic system comprises a pump control motor main loop, a valve control branch circuit, a mode switching unit and a control unit, wherein the valve control branch circuit is connected with the pump control motor main loop in parallel through the mode switching unit. The control method is characterized in that a controller has two layers of control strategies, wherein the first layer of control strategy is a mode selection strategy, and the system can be in variousworking modes such as the valve control mode, pump control mode and valve-pump combined control mode by controlling the mode switching unit; and the second layer of control strategy is a flow controlstrategy, one circuit is used for controlling the displacement of a proportional variable pump so as to adjust the flow in the pump control mode, the other circuit is used for controlling an opening of a proportional reversing valve so as to adjust the flow in the valve control mode, and finally, the rotating speed of a hydraulic motor is controlled through a closed loop. The valve-pump combined multi-mode hydraulic control system can be used for hydraulic power devices with obvious speed regulation processes, such as a hydraulic elevator and an engineering machinery rotary table, different working modes are adopted in different speed regulation stages, so that the comprehensive speed regulation performance of the system is improved.

The invention discloses a hydraulic walking mechanism for a tunnel lining working jumbo and a control method. Hydraulic motors on the left side and the right side of a hydraulic oil driver of a hydraulic pump station are connected and then connected with drive wheel axles on the left side and the right side through couplers, so the jumbo is driven to walk; in order to make the jumbo advance or retreat, bidirectional quantitative hydraulic motors are adopted as the hydraulic motors, and the hydraulic motors are rotated forward or backward by changing the flowing direction of hydraulic oil in the hydraulic motors; in order to synchronously control a left drive wheel and a right drive wheel of the jumbo, through signals of pressure sensors between a proportional electromagnetic valve and the hydraulic motors and encoders on driven wheels, the proportional electromagnetic valve is controlled so as to control the rotating speed of the hydraulic motors; a drive mechanism adopted by the hydraulic walking mechanism is simple in structure, high in reliability and convenient to control.

The invention discloses an injection head driving device for coiled tubing, and belongs to the field of petroleum. The injection head driving device for the coiled tubing comprises two sets of hydraulic motor driving mechanisms arranged in an injection head box body, and each set of hydraulic motor driving mechanism comprises a hydraulic motor, a hydraulic brake device, a connecting disc, a bearing block, a planetary reducer, a bearing, a sprocket shaft and a central shaft. The hydraulic motors and the planetary reducers are mounted on the two sides of the injection head box body respectively, the sprocket shafts are hollow shafts, the central shafts penetrates through the sprocket shafts, one end of each central shaft is connected with the output end of each hydraulic motor, and the other end of each central shaft is connected with the input end of each planetary reducer. The injection head driving device for the coiled tubing has the advantages of being compact and symmetrical in structure, good in balance performance, easy to lift, operate and mount, high in driving efficiency and good in low speed stability.

The invention provides a walking transmission system for airport equipment, which ensures the speed controllability and comfortableness of the airport equipment, can realize continuous variable transmission and ensures operating comfortableness. The system comprises an input shaft and a variable pump which is connected with the flywheel end of an engine, wherein the oil inlet and the oil outlet of the variable pump are communicated with the oil outlet and the oil inlet of a hydraulic motor through hydraulic pipelines respectively.

The invention discloses a dual-power-source vehicle-mounted tunnel lamp cleaning system. The dual-power-source vehicle-mounted tunnel lamp cleaning system comprises a vehicle-mounted platform, a lifting platform installed on the vehicle-mounted platform and a cleaning device installed on the lifting platform, the lifting platform is connected to the vehicle-mounted platform in ways of lifting and orientationchanging, the vehicle-mounted platform comprises two sets of power sources which are the high-speed power source andthe low-speed power source, and a switching device is arranged between the high-speed power source and the low-speed power source and used for switching the power sources to achieve normal running of the vehicle-mounted platform and low-speed running during lampcleaning. According to the cleaning system, the two sets of power sources are arranged, thus the normal running requirements of the vehicle-mounted platform can be met, and low-speed and stable runningduring lampscleaning can also be met.

The invention relates to a high-performance hydraulic system of a small four-wheel laser leveling machine. The high-performance hydraulic system of the small four-wheel laser leveling machine comprises an oil tank, an auger motor, a left leveling oil cylinder, a right leveling oil cylinder, an inclination angle oil cylinder, a walking motor, a vibration motor and a steering oil cylinder. The oil tank is connected with a seven-linkage electromagnetic reversing valve and a three-linkage gear pump; and the seven-linkage electromagnetic reversing valve comprises a confluence electromagnetic valve,a first linkage electromagnetic valve, a second linkage electric proportional valve, a third linkage electric proportional valve, a fourth linkage electric proportional valve, a fifth linkage electromagnetic valve, a sixth linkage electromagnetic valve and a seventh linkage electromagnetic valve which are integrated into a whole valve block or installed separately. The functions of auger scraping, left-right leveling of a leveling head mechanism, inclination angle adjusting, high-low-speed walking, priority, skid resistance, oscillation and vibration, steering, emergency movement, composite action and the like are achieved through the seven-linkage electromagnetic reversing valve, so that the high integration level is achieved, the convenience in installation and maintenance is realized,the climbing force of the equipment is effectively improved, the vehicle speed is controllable during downhill running, the stability in steering is realized, the performance of the laser leveling machine is remarkably improved, and rapid and high-precision leveling operation of a concrete floor is realized.

The invention discloses an aircraft tractor. The aircraft tractor comprises a chassis assembly on which a frame is arranged, a cab installed on the frame, a plurality of tractor wheels assembled on the chassis assembly, a front axle and a rear axle, wherein at least some of the plurality of tractor wheels are steerable tractor wheels, an aircraft wheel support assembly and a power assembly are arranged at the middle part of the tractor, and a hydraulic steering assembly is installed at the steerable tractor wheels; the power assembly comprises an engine, the engine, a transmission and a torque converter are arranged in parallel, and the transmission is connected with the front axle and the rear axle of the tractor by drive shafts, and used for the rotation of the tractor wheels during the taxiing of an aircraft; the hydraulic steering assembly comprises a front-axle steering cylinder and a rear-axle steering cylinder, and used for the steering of the tractor wheels during the taxiing of the aircraft. The aircraft tractor disclosed by the invention is provided with the maximum traction force of 12000 kg, the maximum forward running speed of 25 km / h and the maximum reverse speed of 20 km / h.

The invention relates to an S typed four roller pressing extending line host computer distance adjusting system. A high precision roller distance control system consists of an distance adjusting part and a control part, wherein, the distance adjusting part drives a turbine box by a servo motor through a deceleration box, a worm gear drives a nut through inner and outer gear covers, the screw rod copulated with the nut does not rotate, the rotation of the nut drives the screw rod to move forward or backward in the radial direction, and the screw rod is connected with a bearing body; and the control part is a controller which sends command signals to a servo controller which controls a servo motor, the servo motor feeds back the data information to the servo controller through a coder, the servo controller carries out compare and calculation according to the current roller distance, afterwards the servo controller drives the servo motor to operate or stop, and a closed loop control is accomplished. The accurate fault detection function of the distance adjusting system eliminates mechanical fixed return difference through the procedures so as to ensure the positioning accuracy; the operational synchronization ensures the adjusting stability and synchronization of two ends in the roller canister; the automatic positioning of the roller distance is achieved, and the formula function of the roller distance is achieved.

The invention discloses an electrohydraulic motor which comprises a shell and a crankshaft, wherein the crankshaft penetrates through and is mounted on the shell; a swing disk, an oil feeding cylinder, an oil discharging cylinder, a balance cylinder, reversing valves, an oil feeding channel and an oil return channel are mounted in the shell; the oil feeding cylinder, the oil discharging cylinder and the balance cylinder are respectively communicated with the reversing valves; each reversing valve is correspondingly communicated with the oil feeding channel and the oil return channel; the swing disk sleeves the crankshaft; pistons of the oil feeding cylinder, the oil discharging cylinder and the balance cylinder are respectively connected with the swing disk. The electrohydraulic motor has the advantages that oil distribution, clockwise rotation and anticlockwise rotation are easy to control, the operation is convenient, and the cost is lowered.

The invention relates to a valve-pump combined multi-mode hydraulic control system and a control method thereof. The multi-mode hydraulic system comprises a pump control motor main loop, a valve control branch circuit, a mode switching unit and a control unit, wherein the valve control branch circuit is connected with the pump control motor main loop in parallel through the mode switching unit. The control method is characterized in that a controller has two layers of control strategies, wherein the first layer of control strategy is a mode selection strategy, and the system can be in variousworking modes such as the valve control mode, pump control mode and valve-pump combined control mode by controlling the mode switching unit; and the second layer of control strategy is a flow controlstrategy, one circuit is used for controlling the displacement of a proportional variable pump so as to adjust the flow in the pump control mode, the other circuit is used for controlling an opening of a proportional reversing valve so as to adjust the flow in the valve control mode, and finally, the rotating speed of a hydraulic motor is controlled through a closed loop. The valve-pump combined multi-mode hydraulic control system can be used for hydraulic power devices with obvious speed regulation processes, such as a hydraulic elevator and an engineering machinery rotary table, different working modes are adopted in different speed regulation stages, so that the comprehensive speed regulation performance of the system is improved.

The invention relates to a hydrodynamic drive system for a mine car, which comprises an engine, a gear-shifting clutch and a mechanical speed changing box as well as an elastic plate, a hydrodynamic torque converter, a shell and a turbine shaft, wherein the output end of the engine is fixedly connected with the flexible plate, the output end of the turbine shaft is connected with the mechanical speed changing box, and the hydrodynamic torque converter is arranged in a working cavity formed by the elastic plate, the shell and the turbine shaft; and a torsional damper and a lockup clutch are arranged in a cover vortex working cavity formed by a cover wheel, a turbine body and a turbine hub, one end of the torsional damper is fixed on the turbine hub, the other end of the torsional damper is connected with the lockup clutch by a spine, and the other end of the lockup clutch is connected with the cover wheel by a spine. The hydrodynamic drive system solves the technical problem of higher car price caused by a conventional expensive automatic speed changing box with the hydrodynamic torque converter. The hydrodynamic drive system is additionally provided with the hydrodynamic torque converter so that the connection of the engine and the mechanical speed changing box is changed to be flexible connection, the clutch is protected, and then a torque is increased.

The invention relates to a traveling control system, in particular to a traveling control system which is particularly applicable to a small-sized pavement milling machine, and belongs to the field of an electric-hydraulic control system of a traveling machine. The small-sized pavement milling machine traveling control system comprises a traveling pump, a diverting valve, a control valve blank, a high-speed motor and two low-speed motors, wherein the traveling pump conveys the hydraulic oil respectively to the low-speed motors and the high-speed motor in parallel connection through the diverting valve, and then the hydraulic oil is returned to the traveling pump to form a closed loop. The small-sized pavement milling machine traveling control system is characterized in that by adopting the parallel connection way of the high-speed motor and the two low-speed motors, a rear wheel does not need to be connected with a reducer, so that the axial size of the rear wheel is reduced, the entire design is optimized, the swinging of the rear wheel is not influenced, and the rear wheel is more applicable to the small-sized pavement milling machine; meanwhile, the sufficient driving force also can be guaranteed, and the milling requirement of the milling machine can be met.

The invention belongs to the technical field of a servo driver, in particular to a high torque starting method for the servo driver. The aim of the invention is to solve the problem of serious influence on the control accuracy of a servo system due to executive mechanism vibration caused by disturbed torque in the starting process of an alternating current (AC) permanent-magnet servo motor. The technical scheme provided by the invention comprises the following steps of: firstly, establishing a simulation model of the servo driver in MATLAB according to the hardware circuit of the servo driver; secondly, acquiring a proportion integration differentiation (PID) value according to a multi-model control method based on pattern recognition; and finally, acquiring a control signal by a space vector pulse width modulation (SVPWM) method according to the acquired PID value to drive the servo motor and realize the startup of the servo driver. Based on a correction and control technology for current and position deviation in the starting process of the servo driver, the method is effective and rapid and can weaken the ripple wave torque generated by countering electromotive force of the motor and stator current harmonic, improve the low speed stability and control the accuracy.

The invention discloses a large-torque hydraulic motor crankshaft. By means of the large-torque hydraulic motor crankshaft, the starting torque and the transmission torque of a motor can be improved.According to the technical scheme, by means of the eccentric bent neck end of the motor crankshaft and an eccentric wheel shaft connected with a coaxial connecting rod, the degree of freedom of horizontal, vertical and front-back reciprocating motion of the crankshaft is limited, pressing rings for bearing hydraulic pressure and roller pins assembled in the pressing rings are assembled at the position, between the eccentric bent neck end and the eccentric wheel shaft end, of the crankshaft, the pressing rings are arranged at intervals through spacer rings and distributed between positioning spacer rings and baffle rings in a linear array manner, it is guaranteed that the roller pins make contact with the pressing rings all the time in the working process of the crankshaft, an axial positioning effect is achieved on the roller pins, and a static pressure balance structure is formed between the roller pins and a crankshaft motion pair; and hydraulic force applied to the pressing rings generates the torque enabling the crankshaft to rotate through the eccentric distance e of the crankshaft, and the roller pins convert a sliding friction motion pair between the inner surfaces of the pressing rings and the outer surface of the crankshaft into a rolling friction motion pair. Reliability of stable transmission efficiency and precision is ensured.

The invention discloses a coiled tubing injection head driving device, which belongs to the petroleum field. The device includes two sets of hydraulic motor drive mechanisms arranged on the injection head box, each hydraulic motor drive mechanism includes a hydraulic motor, a hydraulic brake device, a connecting plate, a bearing seat, a planetary gear reducer, a bearing, a sprocket shaft and The central shaft, the hydraulic motor and the planetary gear reducer are respectively installed on both sides of the injection head box, the sprocket shaft is a hollow shaft, the central shaft passes through the sprocket shaft, and the center One end of the shaft is connected with the output end of the hydraulic motor, and the other end of the central shaft is connected with the input end of the planetary gear reducer. The embodiment of the present invention has the advantages of compact structure, symmetry, good balance, easy hoisting and operation installation, and also has the advantages of high driving efficiency and good low-speed stability.

A linear power driving controller based on large-power operational amplifier for a three-phase alternating current motor consists of a linear power driving module, a signal detecting module, a digital control module and a digital-analogue (D / A) converting module. The signal detecting module detects a motor three-phase winding current signal and a motor rotor position signal, converts the signals into signals which can be directly received by the signal detecting module and transmits the signals to the signal detecting module. The signal detecting module finishes calculation of a control algorithm according to received motor state information and gives a digital quantity control signal. The D / A converting module converts the digital quantity control signal into an analog quantity control signal and transmits the analog quantity control signal to the linear power driving module. The linear power driving module isolates the analog quantity control signal and a power level signal, further performs power amplification, provides high voltage and large current for a motor winding and accordingly achieves high-precision control of the three-phase alternating current motor. The linear power driving controller has good application prospect in the technical field of electric motor automatic control.

The invention relates to an azimuth rotation static-pressure support system of a tower solar thermal power generation heliostat. The tower solar thermal power generation heliostat includes a tower frame, a hydraulic motor speed reducer, an azimuth rotating unit and a pitching motion unit. The system designs chute and slide ring structures, and injects oil to the lower bottom end surface of a slide ring and the upper flat end surface of a chute through a pressure reducing valve, a one-way valve and a capillary throttling valve, so that the lubricating performance is greatly improved, the rotating torque of the tower heliostat azimuth is reduced by 70% compared with the torque of a mechanical drive, the azimuth rotation driving torque is largely reduced, the sizes of the driving device and the hydraulic motor are both largely reduced, and the cost of the azimuth driving device is correspondingly reduced.