1425 results about "Hydraulic motor" patented technology

A hydraulic motor output shaft vibration detection device disclosed by the present invention is characterized in that a limiting piece and a driving piece are sequentially installed in a detection box from top to bottom, a memory pointer is installed on the limiting piece, a main pointer is installed on the driving piece, and a contact rod is installed at the lower end of the detection box in an up-down sliding manner; the upper end of the contact rod extends into the detection box and is connected with the driving part, a limiting structure used for limiting the limiting part is installed in the detection box, an unlocking part is installed on the surface of the rear side of the detection box, and the limiting structure is in sliding connection with the unlocking part. The memory pointer is connected with the limiting structure through the limiting piece, the main pointer can detect the corresponding amplitude when the output shaft of the hydraulic motor rotates in real time, the memory pointer can record the maximum amplitude when the output shaft of the hydraulic motor rotates, instant recording of the amplitude is facilitated, and a recorder can clearly see the current vibration value and the maximum peak value at a glance.

The invention discloses a hydraulic motor abrasion monitoring method and system, and belongs to the technical field of abrasion fault prediction.The method specifically comprises the steps that multi-dimensional data signals of a hydraulic motor are collected in real time and preprocessed; the preprocessed multi-dimensional data of the hydraulic motor are processed, the early wear characteristics of the hydraulic motor are extracted, and the processing comprises decomposition of the preprocessed multi-dimensional data of the hydraulic motor, construction of a decomposition tree, reservation of nodes with preset frequency in the decomposition tree, and reconstruction, difference calculation and window moving average suppression of the reserved nodes; fusing the early wear characteristics of the hydraulic motor, and generating a comprehensive health index through a dimension reduction algorithm; judging whether the hydraulic motor has early-stage fine wear or not according to the comparison of the comprehensive health index and a dynamic threshold value, and giving an alarm according to a judgment result; according to the method, early-stage fine wear signs of the hydraulic motor can be found, a maintenance plan is made in advance, and production interruption caused by sudden equipment failures is avoided.

The invention relates to the technical field of industrial water treatment equipment, and discloses an intelligent flushing self-cleaning filter system for industrial water treatment. A dynamic suspended matter monitoring module of the system collects three-dimensional distribution data of deposits on the surface of a filtering medium in real time, and mixed deposition characteristics of suspended solids and oil stains are recognized through a multispectral imaging technology; the differential pressure trigger control module establishes a mapping relation between sediment thickness and fluid resistance according to the three-dimensional distribution data, and generates a cleaning trigger instruction when the real-time differential pressure data reaches a dynamic threshold interval; the spiral trajectory planning module analyzes the cleaning trigger instruction, and generates a composite motion trajectory containing a rotation angular velocity and an axial displacement rate in combination with the current position of a suction nozzle and a filter screen topological structure; the multi-mode flushing execution module synchronously adjusts torque output of a hydraulic motor and linear displacement of a piston cylinder based on the composite motion trail, so that a suction nozzle covers the whole effective filtering area of a filter screen along a spiral path.

The invention relates to the technical field of intelligent manufacturing equipment, in particular to a turning machine tool and a turning method of a hydraulic motor output shaft. The turning machine tool comprises a rack, a drill chuck assembly used for clamping and fixing a workpiece is rotationally installed on the rack, and the drill chuck assembly is driven by a driving device arranged on the rack to rotate; a tailstock is fixed to the machine frame, and an ejector pin which can linearly move, can rotate and is used for abutting against and limiting the end of a workpiece is installed on the tailstock. A tool rest bottom plate capable of linearly moving in the axial direction of a workpiece is arranged on the rack, a rotary cutter head is arranged above the tool rest bottom plate, and a tool turret is arranged above the rotary cutter head; a plurality of turning tools with the machining precision gradually increased are sequentially and fixedly clamped on the tool turret in the circumferential direction at equal angles. The turning method is efficient, precise and high in automation degree. And the bottleneck problems of low efficiency, poor precision stability, dependence on skilled workers and the like of multi-precision shaft parts such as output shafts of hydraulic motors in the traditional turning process are effectively solved.

The invention relates to the technical field of hydraulic control, and discloses a hydraulic motor constant torque self-adaptive PID (Proportion Integration Differentiation) control system which comprises a controller and a hydraulic driving unit, the controller performs frequency domain separation on the pressure signal by using a signal preprocessing module, and extracts an average pressure difference representing the driving force and a ripple amplitude representing the fluid rigidity; the state observation module estimates an instantaneous volume elastic modulus based on the ripple amplitude, corrects a compression item in a flow continuity model by using the elastic modulus, and calculates an instantaneous leakage coefficient of the motor in real time; the self-adaptive control module establishes dynamic mapping of PID gain and physical parameters, the proportional gain is adjusted by using a leakage coefficient to match system damping, the integral gain is adjusted by using a volume elastic modulus to adapt to inherent frequency, and a control instruction is synthesized by combining feedforward compensation. According to the method, the problem of model mismatch caused by oil characteristic change and motor abrasion is effectively solved, and the whole-life-cycle control precision of the system is improved.

The invention discloses a hydraulic system and hydraulic equipment for self-adaptive buffering under impact. Comprising a hydraulic motor used for driving an execution element, a closed type pump set used for driving the hydraulic motor, and a first oil way used for connecting an oil outlet of the closed type pump set with an oil inlet of the hydraulic motor. The second oil way is used for connecting an oil outlet of the hydraulic motor with an oil inlet of the closed type pump set; the self-adaptive cushion valve set is used for weakening pressure impact of the oil way on the high-pressure side and avoiding pressure suction of the oil way on the low-pressure side; oil inlets and oil outlets of the two self-adaptive buffer valve groups are oppositely connected with the first oil way and the second oil way in parallel; the hydraulic closed system is ingenious in structure, the self-adaptive buffer valve group can weaken pressure impact of a high-pressure side oil way, meanwhile, the situation that the pressure of a low-pressure side is rapidly reduced or even air is sucked is avoided, normal work of the hydraulic closed system is guaranteed, and the service life of the hydraulic closed system and all elements can be prolonged.

The invention discloses a self-adaptive adjustment strip tillage machine, and belongs to the technical field of agricultural machinery. The strip tillage machine comprises a rack assembly, and a subsoiler assembly, a strip tillage assembly, a pressing assembly and a hydraulic source assembly are arranged on the rack assembly; at least one subsoiler assembly is provided with a soil moisture content detection device, the signal output end of the soil moisture content detection device is connected with a controller, the pressing assembly comprises a pressing roller frame hinged to the rack assembly, a pressing roller is installed on the pressing roller frame, a hydraulic motor is connected to the pressing roller, and a hydraulic position adjusting assembly is connected between the pressing roller frame and the rack assembly. The output end of the controller is electrically connected with the hydraulic source assembly, and the hydraulic source assembly is in hydraulic connection with the hydraulic position adjusting assembly and the hydraulic motor. The soil moisture content detection device can automatically detect the water content of soil, converts the water content of the soil into an electric signal and transmits the electric signal to the controller, and the controller can adjust the pressing force of the pressing assembly and the rotating speed of the pressing roller according to the water content of the soil.

The application relates to the technical field of geological exploration, in particular to a wireless seismograph field burying equipment and a working method, which comprises a module square warehouse, a drum stock bin is arranged in the module square warehouse, a cloth drilling integrated machine and a mechanical hand are arranged on one side of the drum stock bin; the drum stock bin comprises a drum stock bin support, one end of the central shaft of the drum stock bin support is connected with a driven chain wheel, one rotary disc is arranged on the inner side of each of the two drum stock bin supports, the two rotary discs are hinged with the outer side wall of a code frame, and the wireless seismograph is placed in the code frame; the cloth drilling integrated machine comprises a moving platform back plate, a guide rail is arranged on the outer side of the moving platform back plate, a first hydraulic cylinder is arranged on the top of the guide rail, a hydraulic motor is arranged on the top of a fixed connecting plate, an oil cylinder is hinged on the outer side of the fixed connecting plate, the oil cylinder is hinged with a lower pressing semicylinder, a soil pressing outer sleeve and a limiting cylinder are arranged below the lower pressing semicylinder, and the side wall of the limiting cylinder is connected with a slide guide cylinder; the mechanical hand can clamp the wireless seismograph in the code frame and send the wireless seismograph into the cloth drilling integrated machine.

The invention discloses drill rod multi-mechanism cooperative type self-adaptive feeding and discharging integrated equipment and method, and relates to the technical field of drilling machinery, the drill rod multi-mechanism cooperative type self-adaptive feeding and discharging integrated equipment comprises a frame body, a driving mechanism is mounted on one side of the frame body, the drill rod multi-mechanism cooperative type self-adaptive feeding and discharging integrated equipment further comprises a clamping mechanism, the clamping mechanism comprises a mounting base, a supporting rod is fixed to the mounting base, and two grippers are rotationally connected to the mounting base; a hydraulic rod is rotationally connected between the two grippers, a connecting assembly is arranged on each gripper and comprises a hydraulic motor fixedly installed on one side of the gripper, two driving wheels are rotationally connected to the other side of the gripper, one driving wheel is fixed to a driving shaft of the hydraulic motor, and the other driving wheel is fixed to a driving shaft of the hydraulic motor. According to the device, automatic feeding and connecting and automatic dismounting and discharging of the drill rod are achieved through the driving mechanism and the clamping mechanism, the working efficiency and safety are remarkably improved, in addition, the obliquely-arranged driving wheel combines the rotating function and the axial moving function, and the working efficiency is greatly improved. And the single operation period can be further shortened.

The invention belongs to the technical field of roadway support, and particularly relates to roadway drilling and anchoring equipment which comprises a crawler, a lifting arm is arranged on the crawler, a base is arranged on the lifting arm, a rotating mechanism is arranged on the base, a drilling device and an anchor rod filling device are arranged on the rotating mechanism, and the anchor rod filling device is arranged on the drilling device. The anchor rod filling device comprises an anchor rod switching mechanism and an anchor rod inserting mechanism, the anchor rod switching mechanism is arranged above the anchor rod inserting mechanism, and the anchor rod inserting mechanism is used for sequentially inserting anchor rods provided by the anchor rod switching mechanism into drill holes. The drilling, anchor rod supplying, inserting and supporting functions are integrated, and coherent operation is achieved through a hydraulic motor, threaded rod transmission and an automatic control system. Automatic anchor rod supply is achieved, anchor rod insertion is completed through the ejector rod pushing mechanism, manual intervention and procedure connection time are shortened, and the supporting efficiency is improved; the equipment can be compatible with anchor rods of different specifications, the application range is expanded, and the multi-scene requirement is met.

The invention discloses a flywheel energy storage device which comprises a flywheel with a rotating shaft, a magnetic bearing for supporting the rotating shaft, a vacuum cover, an integrated motor for bidirectionally converting electric energy and kinetic energy between the flywheel and electric equipment, and a control system which comprises a displacement sensor capable of monitoring the eccentricity of the flywheel in real time. The magnetic bearing comprises an electromagnetic bearing and / or a permanent magnet bearing, and the magnetic suspension controller adjusts electromagnetic force in the electromagnetic bearing through an algorithm so as to offset centrifugal force brought by eccentricity of the flywheel. The algorithm is a PID control algorithm. The electromagnetic bearing is a low-temperature superconducting magnetic bearing. The integrated motor is connected with the oil pump, and the oil pump can be started to drive the hydraulic motor to link the transmission and the permanent magnet generator for power generation. The eccentric amount of the flywheel is monitored in real time through the displacement sensor, the electromagnetic force of the electromagnetic bearing is dynamically adjusted, the influence of centrifugal force on the flywheel is counteracted, the phenomenon that vibration is intensified due to high-speed rotation is avoided, and stability and safety are improved.

An electrohydraulic system for a work machine includes a pump, a motor fluidly coupled to the pump, a subassembly driven by the motor, and a rate-control valve fluidly coupled to the pump and the motor. The rate-control valve is movable through a range of positions. A present speed of the motor is proportional to a present position of the rate-control valve. The present position of the rate-control valve is adjustable by varying a current supplied to the rate-control valve. The supply of current to the rate-control valve is adjusted based on the difference between the present speed of the motor and a target speed of the motor.

The utility model belongs to the technical field of hydraulic valves, and discloses a two-stage buffer overflow valve and a fluid control assembly. The two-stage buffering overflow valve comprises a valve seat assembly, a valve body, a valve element mechanism, an oil passing channel and a buffering piston, the valve seat assembly is provided with an oil inlet, the valve body is arranged at the end, away from the oil inlet, of the valve seat assembly in a sleeving mode, the valve body is provided with an oil outlet, and the valve element mechanism comprises a sliding valve element arranged in the valve seat assembly in a sliding fit mode; the end, away from the oil inlet, of the sliding valve element is provided with a secondary pressure building cavity, the secondary pressure building cavity communicates with the oil inlet, at least part of the oil passing channel is arranged on the sliding valve element and / or the valve seat assembly and / or the valve body, and the oil passing channel communicates with the secondary pressure building cavity and the oil outlet; the buffer piston is arranged on the valve seat assembly in a sliding and sleeving mode and can block or open the oil outlet. By prolonging the completion time of secondary pressure establishment, the buffering effect is improved, and the impact generated when the hydraulic motor is started and braked is reduced.

A method for controlling a hydraulic motor vehicle braking system, wherein brake pressure is to be built up at wheel brakes on a front axle and a rear axle by means of via an electric pressure supply device based on a brake demand variable. Inlet valves of the wheel brakes on the front axle and rear axle are open and a brake demand variable is implemented by joint pressure build-up on the front axle and rear axle in the case of no fault. In the event of a fault with a degradation of the pressure supply device, the pressure build-up is first applied to the front axle by closing the inlet valves of the wheel brakes of the rear axle before or at the start of volume delivery. When a condition is met, the wheel brakes on the rear axle are activated by opening the inlet valves.

The invention discloses a swing component sensing and autonomous anti-swing system of an automobile crane and a control method of the swing component sensing and autonomous anti-swing system, and relates to the technical field of anti-swing of lifted objects of automobile cranes. And the execution module comprises a metering pump, a proportional multi-way reversing valve, a variable-amplitude oil cylinder, a hydraulic motor, a speed reducer and a PID (Proportion Integration Differentiation) execution controller which are arranged on the automobile crane. Through decomposition and conversion of complex swing, the controller module decomposes and converts the complex swing into two-dimensional swing components on xOz and yOz planes, an anti-swing strategy is suitable for various complex swing, a control system reads swing information on the planes and autonomously executes anti-swing control of the corresponding planes, and the anti-swing control precision is improved. And the variable-amplitude oil cylinder and the hydraulic motor are controlled to execute corresponding anti-swing actions and stage speed reduction anti-swing control, so that the working speed of the variable-amplitude oil cylinder is reduced by 50% stage by stage, the deviation distance of a hoisted object can be identified through action compensation anti-swing control, and a control system performs automatic compensation without depending on experience of a driver.

The utility model discloses a deep cone paste thickener for a mine tailing filling system, and belongs to the technical field of thickeners. Comprising a shell, and the shell comprises a cylindrical bin, a cone bin located at the bottom of the cylindrical bin and a conical opening portion located at the bottom of the cone bin; a bridge is horizontally erected on the top face of the cylinder bin, a hydraulic motor speed reducer is arranged in the middle of the top face of the bridge, the output end of the hydraulic motor speed reducer is detachably and fixedly connected with a rotating rod, the bottom end of the rotating rod is detachably and fixedly connected with a scraping and collecting mechanism, and the scraping and collecting mechanism is located in the cone bin. And the bottom end of the scraping and collecting mechanism is detachably and fixedly connected with an anti-blocking mechanism. By arranging the anti-blocking mechanism, high-concentration tailing slurry is in a flowing state and is not easy to condense in the conical opening part, meanwhile, the flowing high-concentration tailing slurry is also easy to discharge from the discharge pipe on the periphery of the conical opening part, and the phenomenon that the discharge pipe is blocked is not easy to occur.

The utility model discloses a hydraulic pipeline and hydraulic motor protection device, a walking device and an excavator. The hydraulic pipeline and hydraulic motor protection device comprises a protection cover and a sealing plate device. The protective cover is of a semi-closed structure, is fixed on the vertical surface of the outer side of the longitudinal beam, and can wrap the hydraulic motor at the end part of the longitudinal beam and the hydraulic pipeline around the hydraulic motor in a box body formed by the protective cover and the longitudinal beam; a window for checking and maintaining the hydraulic pipeline and the hydraulic motor is arranged at the position, right opposite to the hydraulic motor, of the protective cover; after the sealing plate device completely covers the window, the sealing plate device and the protective cover are fixed together in a detachable mode. According to the hydraulic pipeline and hydraulic motor protection device, on one hand, the hydraulic pipeline and the hydraulic motor can be effectively protected and prevented from being damaged by external factors, and on the other hand, a sealing plate device which is specially used for later maintenance of the hydraulic pipeline and the hydraulic motor and can be opened is further designed.

The invention discloses an interference compensation control method for a heave compensation winch. The method comprises the following steps: based on a state space model of a heave compensation winch system comprising a heave compensation winch and a pump station, establishing a backstepping controller through a backstepping control method; establishing a parameter online estimation module of the hydraulic motor of the heave compensation winch, and inputting and processing the initial identification parameters of the hydraulic motor and the dynamic regression vector of the hydraulic cylinder to obtain the identification parameters of the hydraulic motor updated in real time; and inputting the identification parameters and the operation parameters of the heave compensation winch into a backstepping controller, outputting a valve core displacement control instruction of a proportional servo valve of a pump station after processing, and further realizing interference compensation control of the heave compensation winch by controlling the pump station. By means of the method, high-precision tracking and robust stability control over the heave compensation winch system can be still kept under the conditions that the model is uncertain and disturbance is strong, and support is provided for the underwater high-precision operation requirement.

An overload protection device of a rotary cultivator is simple in structure, an overflow valve is mounted on an oil supply pipeline of a hydraulic motor, and when a rotary blade or a rotary blade shaft touches an obstacle which cannot be cut off, hydraulic pressure at an oil inlet of the hydraulic motor is increased suddenly, so that the overflow valve is opened to quickly release pressure, and the rotating speed and torque of the hydraulic motor are quickly reduced; therefore, impact is buffered, overload protection is achieved, and the rotary blade and the blade shaft can be protected. Meanwhile, after the rotary blade can rotate at a low speed to bypass an obstacle, the oil supply management hydraulic pressure is lowered, the overflow valve is closed, so that normal oil supply to the hydraulic motor is recovered, the working state of the rotary blade can be automatically recovered, manual operation is not needed, use is very convenient, and efficiency is high. In addition, a buffering assembly can be additionally arranged, the transmission tile is driven to be far away from the cutter shaft through hydraulic force generated when the oil pressure of the oil supply pipeline is increased suddenly, and therefore power between the rotary blade or the cutter shaft and the hydraulic motor is rapidly disconnected, impact force is rapidly buffered, and overload protection performance is further improved.

The utility model discloses a novel hydraulic control system of household garbage dry-wet classification equipment, and belongs to the field of hydraulic control. The hydraulic control system comprises a large variable pump connected and driven by a first motor, a small variable pump connected and driven by a second motor, a duplex vane pump connected and driven by a third motor, a cooling circulating pump connected and driven by a fourth motor, a pressure control valve group, an extrusion roller feeding control valve group, a cooperative control valve group, an extrusion oil cylinder and a low-speed large-torque hydraulic motor; the device comprises a feeding oil cylinder, a door blocking oil cylinder, a door lifting oil cylinder, a push-pull box oil cylinder, a box locking oil cylinder, an oil return filter, a circulating filter, an air cooler and an oil tank. According to the utility model, the multifunctional control variable pump with constant power and remote constant-pressure control is adopted, so that the device is suitable for the extrusion working condition of household garbage dry-wet classification equipment, the working efficiency is higher, and small-load high speed and large-load low speed are easier to realize; and the system is more energy-saving and smaller in heat generation.

The present invention relates to a flexible weeder for sowings of one or more rows with short inter-row spacings of 5 to 7 cm and up to 20 cm for different crops, driven by hydraulic motors and connected to the hydraulic system of the tractor to draw power therefrom. The weeder comprises the following systems: a suspension system, a cutting system with discs, a transmission system, a travel system (first embodiment), which includes a leveling system in a second embodiment, and a main structure. The tip of the cutting discs penetrates enough into the soil to remove and loosen roots within the optimum weeding time. The discs comprise blades that penetrate, cutting the roots of weeds or turning over the soil enough to expose the roots of any unwanted vegetation to the sunlight.

Crushing and feeding equipment and deep-sea mining and transport system [Solution] The crushing and feeding device of the present invention includes a main body and a hydraulic motor, the main body having at least one roller inside, the roller fitted onto a corresponding roller shaft, the roller shaft rotatably connected to the main body, at least three identical disc blades spaced equally apart in the axial direction of the roller, each disc blade having at least one cutting edge, plugs provided on both the front and rear vertical surfaces of the main body, the plugs fitting into the gap from the roller to the vertical surface of the main body, and the power output shaft of the hydraulic motor connected to the roller shaft. The deep-sea mining and conveying system of the present invention includes a relay station, a mixed-flow pump, a lifting pipe, and a mother ship, the relay station including a supply barrel, a supply pipe, and the crushing and feeding device connected in order from top to bottom, the lower opening of the supply pipe connected to the lifting pipe.

The invention provides a wave energy converter system comprising:—at least two actuators (2) comprising each a buoy (3) and a liquid pump (4) mechanically connected to the buoy (3) to be driven by the buoy movements, and—an electric generator (7) mechanically connected to an hydraulic motor (6) fluidically connected to each liquid pump (4), for converting a motion of the buoys (3) into electrical power, the wave energy converter system being characterized in that it comprises a closed liquid loop system (30) configured to fluidically connect the pumps (4) of different actuators (2) together, by passing through the hydraulic motor (6), wherein the liquid is constrained to flow from the pumps (4) through the hydraulic motor (6), and wherein the liquid is constrained to flow from the hydraulic motor (6) to the pumps (4) In particular, when a first one of the buoys (3) exerts a force on its associated liquid pump (4) that is greater than the force exerted by a second buoy (3), the liquid in the pump chamber of liquid pump (4) linked to the first buoy is directed to the pump chamber of the liquid pump (4) linked to the second buoy (3), through the closed liquid loop system (30) and the hydraulic motor (6). Thus, the liquid moves through the closed liquid loop system (30) and produces electricity via a generator (7) driven by a hydraulic motor (6) as soon as there is a difference of forces between the buoys (3) of different actuators (2). Different forces are produced when different buoys are in a different phase of a wave (9).

The invention relates to the technical field of hydraulic pressure of robots, and discloses a hydraulic system of a flood drainage robot and a hydraulic regulation and control method.The hydraulic system comprises a hydraulic driving module, a hydraulic power module and a control system module, and the hydraulic power module comprises a hydraulic motor, a hydraulic connector and a hydraulic water pump; the hydraulic power module comprises a hydraulic integrated assembly, and the hydraulic integrated assembly is configured to adjust the output flow direction of hydraulic oil; the control system module comprises a sensor assembly, a controller assembly and a pressurizing assembly. The sensor assembly is used for monitoring hydraulic parameters and pressure parameters at a water inlet and a water outlet of the hydraulic water pump. The controller assembly is electrically connected with the sensor assembly and the pressurizing assembly, and the controller assembly is configured to obtain data of the sensor assembly so as to control parameters of hydraulic oil output by the hydraulic power assembly by controlling the pressurizing assembly; the working state of the hydraulic water pump can be rapidly adjusted, and the hydraulic water pump can more rapidly adapt to and meet different water pumping requirements.

The application discloses a kind of pneumatic-hydraulic hybrid wave energy device energy conversion systems, including nozzle, impulse turbine, torque output shaft, shaft coupling, rotational speed sensor, variable displacement pump, energy accumulator, manual reversing valve, first electromagnetic ball valve, second electromagnetic ball valve, hydraulic motor, permanent magnet generator, PID control module, hydraulic oil tank, oil pressure sensor, first hysteresis comparator, second hysteresis comparator, air pressure sensor and overflow valve.The application realizes an innovative pneumatic-hydraulic energy conversion mode by combining air turbine and hydraulic conversion system.

The present invention relates to a method for operating a hydrostatic drive system of a mobile working machine, wherein the hydrostatic drive system comprises a hydraulic pump (12) with adjustable delivery volume and at least one hydraulic motor (3) connected to each other in a hydraulic circuit, wherein the hydraulic pump (12) is driven by a drive motor and the at least one hydraulic motor (3) is configured to drive a wheel of the mobile working machine, characterized in that the method comprises the following steps: a) Determining a speed that corresponds to the actual speed of the mobile working machine or to a quantity dependent on it; b) Determining a target speed value that represents a target value for the speed recorded in step a); c) Control of the speed recorded in step a) taking into account the speed setpoint determined in step b) by changing a control variable for the hydraulic pump (12) while a defined speed of the drive motor is requested; d) Increasing the load exerted on the drive motor by the drive system, while in step c) the speed is regulated; e) Storing the current value of the control variable for the hydraulic pump (12) when, during the increase of the load in step d), it is determined that an operating variable of the drive motor or an operating variable of the hydrostatic drive has reached a first target value.

The plunger assembly comprises a plunger, a spring pin and the needle roller bearing, the needle roller bearing comprises an outer ring and a needle roller, a shaft core is arranged in the center of the needle roller bearing, the needle roller is arranged between the shaft core and the outer ring, fixing grooves are formed in the two sides of the plunger, and the spring pin is arranged in the fixing grooves. The two sides of the shaft core are inserted into the fixing grooves, a spring pin is further arranged at one end of the shaft core, a needle bearing cavity for the needle bearing to be installed is formed in the plunger, when the needle bearing rotates at a high speed, a liquid dynamic pressure oil film is formed between the needle bearing and the needle bearing cavity, and the liquid dynamic pressure oil film provides supporting force for the needle bearing. The shaft core and the liquid dynamic pressure oil film jointly support the downward pressure of the needle bearing, and the needle bearing is characterized in that the liquid dynamic pressure oil film can provide supporting force, the liquid dynamic pressure oil film and the shaft core jointly bear the downward pressure of the needle bearing, frictional resistance is reduced, mechanical efficiency is improved, part abrasion is reduced, and meanwhile the supporting stability of the needle bearing is enhanced.

The utility model relates to the technical field of building construction equipment, and discloses a side clamp for a construction method pile, which comprises a main body, two clamping pieces and an adjusting piece, the two clamping pieces are symmetrically arranged on the two sides of the main body, each clamping piece comprises a driving shaft used for being connected with driving equipment and a rotating shaft used for realizing rotation, and the adjusting piece is arranged on the main body. The adjusting piece is arranged on the two clamping pieces, connected with the two clamping pieces and used for controlling the two clamping pieces to rotate synchronously so as to complete opening or clamping operation of the construction method pile, the driving device is used for providing power for the driving shaft and controlling the clamping pieces to rotate, and the driving device can be a hydraulic motor and the like when used. According to the side clamping equipment, the two clamping pieces are controlled to rotate synchronously through the adjusting piece, and the clamping range and force can be flexibly adjusted according to the sizes of construction method piles of different specifications, so that the side clamping equipment is suitable for the construction method piles of various specifications, the equipment does not need to be frequently replaced, the construction efficiency is greatly improved, and the construction cost is reduced.

An excavator 100 according to an embodiment of the present disclosure comprises a lower undercarriage 1 comprising a pair of left and right tracks 1C, an upper swing body 3, a cab 10, travel hydraulic motors 1ML and 1MR, each driving the left and right pair of tracks 1C respectively, an operator's seat 70 provided in the cab 10, on which an operator can sit, and a pedal assembly 26C comprising pedals 26C1 and 26C2. The excavator 100 is configured to selectively switch between an operating mode of the lower undercarriage 1, the operating mode comprising a normal mode and a single-pedal mode. In the normal mode, the travel hydraulic motor 1ML is driven according to actuation of pedal 26C1, and the travel hydraulic motor 1MR is driven according to actuation of pedal 26C1. In single-pedal mode, both drive hydraulic motors 1ML and 1MR are driven according to the actuation of only pedal 26C2.

The utility model discloses an electro-hydraulic motor pump integrated with a rotating speed sensor, which comprises an oil pump, a magnetic steel seat, sensor magnetic steel and an encoder, the oil pump comprises a pump body and a pump shaft, and the pump shaft is arranged in the pump body and is rotatably connected with the pump body; the magnetic steel seat is fixedly arranged at the tail end of the pump shaft and rotates along with the pump shaft; the sensor magnetic steel is fixedly arranged on the magnetic steel seat; the encoder is arranged at the tail end of the pump shaft, and the encoder corresponds to the sensor magnetic steel in position; a rotating speed sensor is arranged in the encoder, the encoder is at least used for receiving signals of magnetic pole changes of magnetic steel of the sensor, and the rotating speed sensor is at least used for detecting the rotating speed of the pump shaft. The sensor magnetic steel is fixedly arranged at the tail end of the pump shaft, the encoder is arranged at the tail end of the pump body, the rotating speed sensor is integrated in the encoder, and the encoder corresponds to the sensor magnetic steel in position, so that the rotating speed of the pump shaft of the oil pump can be stably and accurately detected.