3735 results about "Oil pressure" patented technology

The invention relates to the technical field of condenser welding, and particularly discloses an aluminum condenser welding device which comprises a workbench, a pair of sliding blocks are assembled on the workbench in a left-right sliding mode, a driving piece and a pushing piece which are matched with the sliding blocks are arranged on the workbench, and the sliding blocks are rotationally connected with the driving piece. A rotating piece for driving the sliding block to rotate to a vertical state is arranged at the joint of the sliding block and the driving piece; a wiping layer is arranged on the sliding block, the wiping layer is located above the sliding block when the sliding block is in a horizontal state, a plurality of ejector rods are arranged on the sliding block in a sliding mode, the ejector rods abut against the inner side of the wiping layer, an oil cavity filled with hydraulic oil is formed in the sliding block, the end of each ejector rod extends into the oil cavity, and a push plate is arranged on the side, away from the wiping layer, of the sliding block in a sliding mode. The push plate moves relative to the sliding block to adjust oil pressure of the oil cavity to drive the ejector rod to move. The aluminum condenser welding device has the effect of improving the welding efficiency and the welding precision.

The invention relates to a rotary buckle type oil pipe quick connection structure and an oil pressure disc brake system. The rotary buckle type oil pipe quick connection structure comprises a first oil pipe with the interior communicated, a connecting piece and an adapting piece, oil ways penetrate through the interior of the connecting piece and the interior of the adapting piece, and the connecting piece and the adapting piece are clamped and limited so as to penetrate through the oil ways; the connecting piece at least comprises a first inserting part and a clamping point part arranged on the side wall of the first inserting part; the adapter at least comprises a main body part, the interior of the main body part is through, and a first containing cavity, a second containing cavity and a third containing cavity which are sequentially arranged and are communicated with one another are formed in the axial middle of the main body part; the bayonet part is arranged on the side wall surface of the first accommodating cavity and is communicated to the second accommodating cavity, so that the clamping point part penetrates through the bayonet part and is rotationally positioned in the second accommodating cavity; and the locking piece is fixedly assembled on the outer wall of the main body part, and a buckling head part which extends into the second accommodating cavity to limit the rotation angle of the clamping point part is arranged on the locking piece. The oil pipe and the pump body can be conveniently and rapidly assembled and fixed, an oil way is smooth and does not leak oil, and rapid assembly of the oil pipe in an oil pressure disc brake system is greatly facilitated.

The invention belongs to the technical field of clamping, and provides a self-adaptive shape follow-up centering clamp and an automatic clamping method. The self-adaptive shape follow-up centering clamp comprises an end cover, an outer circular ring, a floating shape follow-up positioning cylinder, a driving clamping cylinder, an inner circular ring, a hanging ring, a rib plate and a PLC control system. The automatic clamping method can replace a traditional process ring clamping method, self-adaptive shape follow-up positioning and clamping of the barrel workpiece are achieved, the process ring turning procedure is omitted, and material consumption is reduced. After the outer circular ring, the cylindrical roller bearing and the axis of the lathe spindle in the self-adaptive shape follow-up centering clamp are mounted consistently, it can be guaranteed that the middle barrel section coincides with the axis of the lathe spindle. Shape-following positioning of a blank barrel workpiece is achieved through the floating shape-following positioning cylinder, the barrel workpiece is clamped through the driving clamping cylinder, and it is guaranteed that stress is uniform while the axis of the barrel workpiece does not deviate. The device is achieved based on a PLC control system, the clamping force is quantitatively controlled through feedback adjustment of the oil pressure gauge and the proportional valve, and clamping deformation is reduced.

The invention discloses an unmanned platform electromechanical system fault early warning method based on a Transform-BiGRU cross attention mechanism, and belongs to the technical field of fault early warning. The method comprises the following steps: acquiring parameters, and performing time sequence alignment and key feature screening; secondly, designing a parallelization spatio-temporal feature extraction framework: on one hand, capturing a long time sequence dependency relationship through a multi-layer Transform encoder, on the other hand, realizing bidirectional context modeling of a sequence by adopting a bidirectional gating circulation unit, and introducing an interpretable global attention mechanism to perform feature weight dynamic allocation on a BiGRU hidden layer state; and a cross attention feature fusion module is constructed for a Transform and BIGRU fusion problem, and cooperative characterization of a time sequence dynamic feature and a space correlation feature is realized through interactive attention calculation of a spatial-temporal feature tensor. By means of the method, advanced early warning from diesel engine lubricating oil pressure abnormity to whole ship electric power system cascade faults is achieved.

A power transmission device for a vehicle includes a housing that accommodates a power transmission mechanism, a control valve configured to control an oil pressure supplied to the power transmission mechanism, an oil pump configured to supply oil to the control valve, a partition section that divides an interior of the housing into a first chamber that accommodates the power transmission mechanism and a second chamber in which the control valve is arranged upright, and a communication path communicating between the first chamber and the second chamber. An opening area of the communication path is set so that an amount of the oil flowing from the second chamber into the first chamber through the communication path is less than an amount of the oil drained into the second chamber from the control valve while the vehicle is in motion.

The invention belongs to the technical field of hydroelectric generating set monitoring, and relates to a water turbine bearing temperature and lubricating oil state monitoring and fault diagnosis method and system. According to the method, triple-redundancy temperature measurement values of a water turbine bearing are adopted, multiple parameters are fused, redundancy design is adopted, sensor failure diagnosis is executed, a temperature-vibration-oil pressure combined feature space is constructed according to the triple-redundancy temperature measurement values and online oil quality parameters, a fault propagation map is established, and the fault propagation map is analyzed. And finally, based on the multi-level diagnosis model and in combination with the fault propagation atlas, composite fault mode recognition is realized, a fault classification result is obtained, and the composite fault mode recognition is realized based on the multi-level diagnosis model, so that the problems of low reliability, single monitoring dimension and insufficient fault recognition capability of a sensor in the prior art are effectively solved. And the equipment reliability and the operation safety are obviously improved.

The invention belongs to the technical field of drilling, and provides an active vibration reduction method and system based on self-adaptive adjustment of a drill rod load in order to effectively reduce vibration of a drill rod. A real-time feeding oil pressure signal is converted into real-time feeding thrust, and a real-time rotating oil pressure signal is converted into real-time rotating torque; filtering the original vibration signal by adopting a singular value subspace decomposition method to obtain a real vibration signal; according to the preset initial value of the feeding thrust and the preset initial value of the rotating torque, a neural network self-adaptive PID control algorithm is used for conducting self-adaptive comparison calculation, the vibration adjustment amount is obtained, and active vibration reduction is conducted according to the vibration adjustment amount; the system comprises six closed-loop control modules including a preset parameter input module, a signal acquisition module, a signal filtering module, a control algorithm module, a control output module and an execution module, accurate vibration reduction control is achieved, the bounce phenomenon of a drill bit is eliminated, the deviation error of a drill hole is reduced, meanwhile, stick-slip vibration is restrained, and the clamping stagnation failure rate of a drill rod is greatly reduced.

An electronic brake system and an operating method thereof are disclosed. Provided is an electronic brake system, according to the present embodiment, comprising: a first hydraulic pressure supply device for generating hydraulic pressure by means of an electric signal output in response to the displacement of a brake pedal; an oil pressure control unit including a first oil pressure circuit for controlling the hydraulic pressure of a first wheel cylinder and a second wheel cylinder, and a second oil pressure circuit for controlling the hydraulic pressure of a third wheel cylinder and a fourth wheel cylinder; and a second hydraulic pressure supply device which is connected between the first oil pressure circuit and the first and second wheel cylinders, and which generates hydraulic pressure by means of an electric signal if the first hydraulic pressure supply device and / or the oil pressure control unit malfunctions.

The invention provides a driving station state monitoring system for a gravity energy storage transportation track, and relates to the technical field of intelligent control, and the system comprises a calculation module which is used for responding to a primary early warning signal, collecting the real-time oil pressure data of a gear box, a bearing temperature rise rate curve and a dynamic torque feedback value of a target standby driving station, and calculating an availability index; the correction module is used for determining the position of a gearbox input end flange and a driving motor output end coupler as a first monitoring point and the position of connection between a bearing seat and an output shaft as a second monitoring point on a transmission link of the target standby driving station, and respectively calculating the axial temperature gradient difference and the radial vibration energy ratio between the two monitoring points; and generating a dynamic correction value through a preset coupling coefficient, and compensating the availability index based on the dynamic correction value to obtain a corrected index. The operation reliability of the gravity energy storage system can be improved.

The invention discloses an oil return buffer device and an impact test system with the same. The oil return buffer device comprises a cylinder barrel assembly, a buffer piston, an impact piston, an overflow detection loop, an oil charge detection loop and an air charge detection loop. A first inner barrel cavity, a damping hole and a buffering cavity are formed in the cylinder barrel assembly, and the buffering cavity is connected with an oil filling detection loop. The buffer piston is arranged in the first inner cylinder cavity so as to divide the first inner cylinder cavity into a first side cavity and a second side cavity. The buffer piston is provided with a second inner cylinder cavity, the impact piston is arranged in the second inner cylinder cavity to divide the second inner cylinder cavity into an oil return cavity and an air cavity, the oil return cavity communicates with the first side cavity, and the air cavity communicates with the inflation detection loop. The device has the obvious impact stage and the buffering stage, the instant impact pressure is rapidly reduced in the impact stage, the deceleration back pressure is obtained through oil pressure loss in the buffering stage, the buffering effect is obvious and easy to control, and the device is suitable for the field of high-speed large-flow oil return buffering of an impact hydraulic system.

The invention discloses a fracturing sand plugging risk early warning method based on a deep autoregression model and an inverse slope method. The method comprises the steps that time series data of oil pressure, casing pressure, sand ratio, proppant concentration and discharge displacement in fracturing construction are collected respectively, then normalization processing is carried out, and a training set and a verification set are divided; inputting the training set into a deep autoregression model for training, and then verifying by using the verification set to obtain predicted time sequence data of oil pressure and casing pressure; and based on the predicted time sequence data of the oil pressure and the casing pressure, judging whether sand blockage occurs or not by using an inverse slope method. The method has the advantages that oil pressure data and casing pressure data which are most sensitive to sand plugging are analyzed and calculated, multivariate time series prediction is carried out through the deep autoregression model, the numerical values of the oil pressure and the casing pressure are predicted respectively, and early warning is carried out on sand plugging through the reverse slope method. By combining the neural network and the reverse slope method, the early warning effect on sand blockage can be greatly improved.

The invention provides an intake valve late closing device, an intake valve assembly and an engine, and belongs to the technical field of engines, and the intake valve late closing device comprises a cam shaft, a rocker arm shaft, an intake rocker arm, a main roller, a control unit, a movable unit, a contact part and a return spring. The device has the beneficial effects that an air inlet valve late-closing rocker arm in the prior art is omitted, the movable unit is movably connected with the air inlet rocker arm, when the electromagnetic valve is closed, the air inlet cam makes contact with the main roller, and the air inlet valve late-closing roller makes contact with the air inlet late-closing cam but only compresses the return spring; when the electromagnetic valve is opened, engine oil pressure pushes the movable block to move to the position away from the air inlet rocker arm, the air inlet late-closing cam and the air inlet valve late-closing roller are still in contact but do not compress the return spring any more, the air inlet cam and the main roller are separated, a pause gap is formed, and therefore the air inlet late-closing cam does not work any more.

The invention discloses a ship steering engine fault early-warning method based on sparse Bayesian, and the method comprises the steps: collecting the data, such as a rudder angle instruction, an actual rudder angle, steering engine response, motor current, oil pressure, ship speed, ship posture, sea condition grade, in a navigation process, and constructing a time window monitoring sample set through time alignment and normalization; steering engine response features are extracted and spliced with the working condition features to form working condition feature vectors, steering engine state labels are marked in combination with maintenance records to form a training sample set, and an adaptive sparse Bayesian early warning model with working condition related sparse priori is trained; and generating a current working condition feature vector in real-time navigation, inputting the current working condition feature vector into the model to obtain a steering engine fault risk value, and selecting a self-adaptive early warning threshold value according to a sea condition grade to output a fault early warning result. According to the invention, the false alarm rate is reduced and the early fault identification capability is improved under complex sea conditions.

The invention relates to the technical field of transformer heat dissipation, in particular to an oil cooling radiator for a transformer, which comprises a shell, an oil conservator, a telescopic driving piece, cooling fins and the like, electrical elements are arranged in the shell; an oil conservator used for stabilizing the oil pressure in the shell is arranged on the shell; the oil conservator is communicated with the interior of the shell; a plurality of telescopic driving pieces are arranged on the shell; the telescopic ends of every two telescopic driving pieces which are opposite in the front-back direction are jointly and fixedly connected with a plurality of cooling fins used for conducting heat dissipation on insulating oil. The cooling fins are made of heat conduction materials. And each radiating fin is of a hollow structure. The oil leakage part of the welding seam of the cooling fin is blocked through the rubber scraping strip and the blocking plate, insulating oil is prevented from continuously leaking, the insulation performance of electrical components in the transformer is prevented from being reduced, faults such as short circuit and discharge caused by insufficient insulation strength are reduced, and meanwhile it is avoided that follow-up maintenance work is affected by insulating oil leakage.

The invention provides a one-way valve. The one-way valve comprises a valve body, a one-way valve element assembly and a locking valve element assembly. The valve body is provided with an oil inlet, an oil outlet, a first containing cavity and a second containing cavity, the locking valve element assembly is partially located in the second containing cavity, and the locking valve element assembly is configured to be located at the first end of the second containing cavity so as to block the first end of the second containing cavity when the oil pressure of the oil inlet is not higher than a threshold value; when the oil pressure of the oil inlet is higher than the threshold value, the first end of the first containing cavity is driven by oil to move towards the second end of the second containing cavity, so that the first end of the first containing cavity communicates with the oil inlet; the one-way valve element assembly is located in the first containing cavity, and when the first end of the first containing cavity is not communicated with the oil inlet, the one-way valve element assembly moves to the first end of the first containing cavity so as to cut off the oil inlet and the oil outlet. The service life of the one-way valve can be prolonged.

The invention discloses a hydraulic turbine set governor internal oil leakage detection method and system, and the method comprises the steps: S1, obtaining the historical oil leakage state data of a hydraulic turbine set governor oil pressure device, and building the oil leakage risk evaluation data of the oil pressure device; s2, preprocessing the oil leakage risk assessment data of the oil pressure device to obtain an oil leakage risk assessment data set; s3, constructing an oil leakage comprehensive prediction model according to the oil leakage risk assessment data set; and S4, detecting the oil leakage amount of the target hydraulic turbine set speed regulator through the oil leakage comprehensive prediction model, constructing an oil leakage comprehensive prediction model by collecting historical oil leakage state data of the hydraulic turbine set speed regulator oil pressure device, and calculating the oil leakage amount of the target hydraulic turbine set speed regulator by searching the weight and the threshold of the minimum error of the BP neural network real oil leakage amount and the prediction output result. According to the method, the accuracy of predicting the predicted oil leakage amount of the target hydraulic turbine set speed regulator is improved, workers do not need to conduct field detection in the process, and the time and energy of the workers are greatly saved.

The utility model discloses a brake device for a tensioning oil cylinder, and belongs to the technical field of brake equipment. The brake device comprises a cylinder body, a piston, a brake ball, a brake cylinder and an elastic piece, a piston rod penetrates through the cylinder; the piston, the brake cylinder and the elastic piece are all arranged in the cylinder body, the bottom of the elastic piece is connected with the cylinder body, the brake cylinder is arranged above the elastic piece, and the piston is arranged above the brake cylinder; the brake ball can abut against the inner wall of the brake cylinder and the outer wall of the piston rod. A sealing cavity is formed between the cylinder body and the piston; and an oil inlet nozzle communicated with the sealing cavity is arranged on the cylinder wall of the cylinder body. The brake device opens the brake by using the pressure of hydraulic oil and holds the brake by using the restoring force of the elastic piece, so that the stability of the telescopic state of the piston rod is improved; and the brake opening or contracting time can be flexibly adjusted according to the change speed of the oil pressure. The utility model belongs to a normally closed brake structure, and meets the mechanical safety performance requirements of products.

The invention provides a high-pressure overflow valve with an oil supplementing function, and relates to the technical field of valves. The high-pressure overflow valve with the oil supplementing function comprises an overflow valve shell assembly, an overflow valve element assembly and an elastic force adjusting assembly. An overflow port is arranged outside the main valve body, and a leakage port is arranged on the outer side of the pilot valve body. The valve sleeve is fixed to the tail end in the main valve body, an oil outlet hole communicated with the leakage port is formed in the outer portion of the valve sleeve, an inclined face, an arc-shaped annular groove and an annular face which are integrally formed are arranged on the outer wall of the main valve element, and the support and the pilot valve element are movably arranged in the pilot valve body in the axial direction and elastically supported through a second spring. The oil passing through the overflow port extrudes and moves the main valve element backwards through the arc-shaped ring groove and the ring face on the outer side of the main valve element, the oil in the oil tank flows back into the pipeline system through the overflow port, and the oil overflowing into the oil tank automatically flows back into the pipeline system when the oil pressure in the oil tank is higher than that of the pipeline system.

The utility model provides an open-loop controlled multifunctional hydraulic pulse test bench, which comprises a storage oil tank, an oil supply pump machine, a reversing valve, a pressurizing oil cylinder and an oil supplementing overflow valve, according to the test bed, a large amount of oil flows into a system at the moment that an oil way is opened by a reversing valve, and due to the fact that an overflow valve has a lag phenomenon in response, oil pressure instantaneously generates an overshoot peak value, pressure in a pipeline rapidly rises and a pressure peak appears, then the overflow valve is conducted, the oil is guided out along the overflow valve, and the pressure in the system is reduced to the set pressure of the overflow valve; water hammer waves and rectangular waves of various waveforms and frequency bands can be generated by adjusting the diameter of a variable damping hole of the one-way throttle valve and the rotating speed of the motor, so that the hydraulic pulse test bed can form hydraulic pulse waveforms of various waveforms and frequency bands; the set pressure of the overflow valve is increased, meanwhile, the travel switch loses efficacy, and when the reversing valve is located at the right position all the time, a damage test can be conducted on the hydraulic pipeline to measure the maximum pressure value capable of being borne by a tested piece.

A power transmission device for a vehicle includes a housing that accommodates a power transmission mechanism, a control valve configured to control an oil pressure supplied to the power transmission mechanism, a first pump and a second pump configured to supply oil to the control valve. The housing includes a first chamber that accommodates the power transmission mechanism and the first pump, and a second chamber that is arranged adjacent to the first chamber in a horizontal line direction. In the first chamber, the first pump is arranged such that an axis of rotation of the first pump extends along a direction of an axis of rotation of the power transmission mechanism. In the second chamber, the control valve is arranged upright. In the second chamber, the second pump is arranged upright with an axis of rotation of the second pump extending along a vertical direction.

The invention discloses a tightening device for assembling an oil damper, and belongs to the technical field of damper assembling. The device comprises a workbench, a fixing mechanism is arranged on the top face of the workbench, a fixing frame is arranged on one side of the fixing mechanism, a moving assembly is arranged on the fixing frame, and a tightening mechanism is arranged on the moving assembly. The tightening mechanism comprises a mounting seat, the mounting seat is mounted on the moving assembly, a driving motor is arranged on the mounting seat, and a tool assembly is mounted on an output shaft of the driving motor; the adjustable tool assembly is arranged and can be suitable for assembling and using of screw caps of oil pressure dampers of different sizes, a fixing ring is driven to rotate through cooperation of a fixing block A and a protruding block, cooperation of a fixing block B and a mounting disc and arrangement of a threaded rod, and therefore a plurality of connecting rods do arc motion; and the distance between one ends of the inner sides of the connecting rods is adjusted, so that the screw caps of the oil damper with different sizes can be assembled and used, and the adjustment is convenient.

To provide a hydraulic vibration isolator having a poppet valve, which comprises a safety function for preventing damage due to overload, and can be easily replaced with an existing product without increasing the size of the existing product.SOLUTION: A poppet valve device 9 comprises a valve case 11, a valve body 13 that opens and closes a valve seat 11a opening into the valve case 11, and a spring 14 that biases the valve body 13 in an opening direction. The valve case 11 comprises: a flange part 11b that is housed in an outer case 10 communicating with an oil passage 8, slidably penetrates a relief valve seat 10a that opens into the outer case 10 to branch off and merge with the oil passage 8, and abuts against the opening peripheral edge of the relief valve seat 10a; and a relief oil passage 11c formed between a side part and an inner wall of the outer case 10 by cutting out a side part. The valve case 11 is biased by a spring 12 in a direction of closing the relief valve seat 10a. In the poppet valve device 9, excessive oil pressure causes the flange part 11b of the valve case 11 to separate from a valve seat 10a of the outer case 10, and the oil pressure is released through the relief oil passage 11c.SELECTED DRAWING: Figure 5

The power output assembly of the agricultural engine comprises a diesel engine, a hydraulic valve mechanism is connected to the end of a rotating shaft of the diesel engine, an oil inlet mechanism is connected to one side of the hydraulic valve mechanism, a first hydraulic cavity is formed in the side, close to a clutch mechanism, of the hydraulic valve mechanism, and a second hydraulic cavity is formed in the hydraulic valve mechanism; a piston mechanism is arranged in the first hydraulic cavity, and the oil inlet mechanism enables external hydraulic oil to flow into the first hydraulic cavity through an oil way in the hydraulic valve mechanism so as to push the piston mechanism to be combined with the clutch mechanism. A plurality of oil pressure adjusting assemblies used for releasing pressure of hydraulic oil in the first hydraulic cavity and enabling the hydraulic oil to flow into the second hydraulic cavity are further arranged in the hydraulic valve mechanism. The hydraulic valve mechanism enables hydraulic oil to flow into the first hydraulic cavity to push the piston body, so that connection and separation with the clutch are controlled, and the whole oil inlet process is reliable and controllable.

The invention relates to the field of spinning equipment, and provides a large-scale vertical spinning machine which comprises a machine tool assembly, a spindle assembly and a spindle assembly, the machine tool assembly comprises a machining station and a suspension seat, and an oil storage cavity used for storing oil is formed in the machining station; the clamp unit comprises a main shaft and a rotary driving mechanism, and the main shaft is rotationally installed on the machining station through a bearing mechanism; the main shaft is provided with a clamp seat for fixing a blank; the rotary driving mechanism is in transmission connection with the main shaft for controlling the main shaft to rotate; the first oil system comprises a first oil pressure station arranged on the suspension seat, the first oil pressure station is connected with a first oil feeding pipeline and a first oil pumping pipeline, and the end, away from the first oil pressure station, of the first oil feeding pipeline is connected to the bearing mechanism; the end, away from the first oil pressure station, of the first oil pumping pipeline is connected to the machining station and communicates with the oil storage cavity. On the basis, the spinning machine main shaft is lubricated in a circulating oil supply mode, the heat dissipation effect of the main shaft can be improved, and the possibility that the main shaft breaks down or is damaged is reduced.

The invention discloses a pumping unit intelligent lubrication decision making system and method based on multi-source data fusion, and the system obtains multi-source data, such as the rotating speed, the torque, the oil temperature and the oil pressure, and the viscosity, the pH value and the water content of lubricating oil, during the operation of a pumping unit through a multi-source data collection unit, and carries out the processing through a data transmission and preprocessing unit. Data features are deeply mined by means of an improved multi-layer perceptron feature extraction unit, feature fusion is carried out on data of an optimized Transform model fusion unit and a historical data storage unit, and a lubrication decision model construction unit constructs correlation models of lubricating oil viscosity, lubrication period and the like based on the fused features. And finally, the lubrication decision execution unit outputs and executes a decision instruction. The method executes the steps of data acquisition, processing, feature extraction, fusion, model construction and decision execution corresponding to each unit of the system. The problems of lubricating oil waste and insufficient lubrication are avoided, and the operation efficiency and the intelligent operation and maintenance level of the pumping unit in oilfield exploitation are remarkably improved.

The utility model relates to a pod propeller steering sealing system with monitoring and leakage recovery functions, which comprises a steering sealing device body, a pressurized oil lubricating device, an air supply device and a leakage recovery device, the pressurized oil lubricating device is connected with the steering sealing device body and used for providing lubricating oil, and the air supply device is connected with the leakage recovery device. A lubricating medium is provided for the lip-shaped sealing ring in the steering sealing device body, meanwhile, appropriate oil pressure is provided for a sealing cavity in the steering sealing device body, and seawater leakage or lubricating oil leakage when the lip-shaped sealing ring loses efficacy is prevented. The air supply device is connected with the pressurized oil lubricating device and the steering sealing device body and used for providing compressed air and adjusting and monitoring the pressure and flow of the needed compressed air. The leakage recovery device is connected with the steering sealing device body and used for monitoring the leakage condition of the steering sealing device body and discharging leakage of the steering sealing device body to the hull collecting box. According to the steering sealing system, the reliability of the pod propeller is further improved, and the pollution of lubricating oil to the environment is reduced.

The utility model discloses a novel supporting leg control valve which comprises a control module assembly and a plurality of oil cylinder supporting legs, and two hydraulic pipes are installed between the control module assembly and the oil cylinder supporting legs in a communicated mode. The hydraulic control one-way valve is additionally arranged on the hydraulic pipe of the rod cavity, the hydraulic control one-way valve is of a cone valve structure, internal leakage is small, oil pressure of the rod cavity can be effectively kept, the hydraulic control one-way valve is slightly different from a device without a hydraulic control one-way valve in the prior art during normal work, but after the device is stored for a period of time, the hydraulic control one-way valve is not damaged. The hydraulic control one-way valve with a rod cavity can play a role in keeping, so that a piston rod cannot extend out due to leakage of an oil cylinder, the problem is generally solved in an electric control mode in the prior art on an aerial work platform with supporting legs, and the defect is that the problem of time delay occurs during walking. The problem that the oil cylinder leaks and stretches out is solved in a hydraulic mode, and walking can be achieved without the landing leg contraction action in the walking process.

The invention discloses a safety braking hydraulic system for a main elevator of a ship lift and a control method. The hydraulic system comprises an oil tank, a first motor pump set, a second motor pump set, a first high-pressure filter, a second high-pressure filter, a first one-way valve, a second one-way valve, a pressure gauge, a first pressure sensor, an energy accumulator, a stop valve, an oil return filter, a safety brake module and a working brake module. A safety brake loop is provided with a two-way cartridge valve and an electromagnetic directional valve, quick response and brake loosening and locking synchronization are achieved, a working brake loop is provided with an overflow valve and a proportional overflow valve, the proportional overflow valve, a PLC, a third pressure sensor and a speed encoder form a closed-loop system, the voltage of the proportional overflow valve is accurately adjusted according to oil pressure and speed, and the safety brake loop is controlled. The braking torque is timely controlled, stable braking is guaranteed, potential safety hazards such as poor synchronism and uncontrollable braking of a traditional hydraulic system can be eliminated, and safe operation of the main elevator is guaranteed.

Method for configuring a module for detecting the switching of a valve in an oil circulation circuit. Method for configuring a module for determining an oil pressure model for detecting the switching of a valve (113) in an oil circulation circuit (111) in an aircraft turbomachine (110) (100), the method comprising: determining an oil pressure model in the circulation circuit when the valve of the oil circulation circuit has switched and the oil temperature in the circulation circuit is above a first threshold, the oil pressure model being stored in the determination module; and determining a set of functions from the differences between the determined oil pressure model and an oil pressure during an aircraft flight, the set of functions (F) being stored in the determination module. Figure for the abstract: Fig. 1

The invention belongs to the technical field of engineering elements, and discloses a pressure selection valve, a pressure stop valve structure and a hydraulic system. The pressure selection valve at least comprises a valve sleeve, a first valve element and a second valve element, the valve sleeve is at least provided with a first oil port and a second oil port, the first oil port and the second oil port are communicated with an inner cavity of the valve sleeve, and the first valve element and the second valve element are sequentially arranged in the inner cavity in a sliding mode. When the oil pressure at the first oil port is larger than that at the second oil port, the first valve element can abut against and push the second valve element, so that the second valve element can stretch out through the first opening and abut against and push an external stress piece. When the oil pressure at the first oil port is smaller than the oil pressure at the second oil port, the first valve element and the second valve element are far away from each other, and the second valve element can stretch out through the first opening and abut against an external stress piece. According to the pressure selector valve, a conical surface sealing structure is omitted, the machining difficulty of the hole and the valve element is reduced, the machining cost is saved, and the pressure selector valve has good economical efficiency.