1802 results about "Oil pressure" patented technology

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 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.

The invention discloses a power plant direct-current oil pump motor control loop low-oil-pressure self-starting pressing plate adjusting system, particularly relates to the field of direct-current oil pump pressing plate adjustment, and comprises a pressing plate state monitoring module, a working condition decision module, a soft start execution module, a hard start straight-through module and a transient protection module. According to the low-oil-pressure self-starting pressing plate adjusting system of the power plant direct-current oil pump motor control loop, forced locking is achieved through the pressing plate state monitoring module when a pressing plate does not exit, and the risk that an armature winding bears full-pressure impact and counter electromotive force impact when an IGBT is not ready is avoided; soft start and hard start are distinguished through the working condition decision module, and response delay of a single soft start strategy in an emergency is avoided; the IGBT conduction angle climbing rate is dynamically adjusted through a PID control algorithm by means of a soft start execution module, a programmable timer controls time sequence switching of a contactor, smooth progressive climbing of motor current is achieved, bus voltage is stabilized, and current impact and back electromotive force influence in the starting process are reduced.

The invention relates to the hydraulic technical field of hydraulic engineering, and discloses a hydraulic cylinder intelligent oil supply control system and method applied to hydraulic engineering. The system comprises a hydraulic parameter acquisition module, a data fusion processing module, a manifold state modeling module, a dynamic risk prediction module and a self-adaptive oil supply control module. The hydraulic parameter acquisition module is used for acquiring multi-point oil pressure, piston displacement and oil supply flow monitoring signals in real time; the data fusion processing module is used for fusing the multi-source heterogeneous signals; the manifold state modeling module constructs a hydraulic cylinder operation state Riemannian manifold geometric model based on the fusion signal; the dynamic risk prediction module calculates a real-time abnormal aggregation degree index according to the geometric feature vector; and the self-adaptive oil supply control module generates an oil supply control instruction according to the abnormal aggregation degree index. The system can comprehensively sense the operation state of the hydraulic cylinder, accurately model and predict risks, dynamically adjust oil supply parameters, and meet the requirements of modern hydraulic engineering operation.

The automobile part torsional fatigue test bench comprises a bench body, a driving mechanism is arranged at one end of the top surface of the bench body, a workpiece carrying structure is arranged at the other end of the top surface of the bench body, a force application structure is arranged at the position, close to the driving mechanism, of the top surface of the bench body, and the driving mechanism comprises a driving bin. The end, away from the force application structure, of the driving bin is fixedly connected with a servo motor, and the two sides of the middle of the interior of the driving bin are fixedly provided with a cycloidal-pin wheel speed reduction assembly and a planetary speed reduction assembly correspondingly. The driving mechanism is driven by the servo motor, a huge oil supply hydraulic system does not need to be used, the occupied area is small, the output torsion load can be switched through the cycloidal-pin wheel speed reduction assembly or the planetary speed reduction assembly, the load output through the planetary speed reduction assembly is low, constant loads can be repeatedly applied to a workpiece for a long time, and the working efficiency is improved. The output load of the cycloidal-pin wheel speed reduction assembly is high, destructive testing of the maximum load can be carried out, and two detection modes can be considered.

The invention relates to the technical field of hydraulic element testing, in particular to a high-pressure axial plunger pump bearing bush pair interface friction and oil film characteristic testing device. According to the device, 10-60 MPa adjustable oil pressure is provided through the hydraulic pipeline unit, the driving unit achieves power loading and friction monitoring through a servo motor and a torque sensor, the main body unit conveys high-pressure oil to a bearing bush contact face through an in-shaft cross-shaped oil duct structure to form a static pressure supporting oil film, and a micron-sized oil film sensor is integrated; the oil detection unit monitors oil parameters, and the signal acquisition and control unit performs closed-loop regulation on oil supply flow, motor rotating speed and swash plate load based on oil film thickness, torque and pressure signals. The method has the beneficial effects that 0.2 mu m-level oil film fracture identification is realized, the occurrence rate of dry friction is reduced by 82% through a cross-shaped oil duct in the shaft, and the oil film fluctuation rate lt is cooperatively controlled through multiple parameters; + / -3%, the safety interlocking mechanism responds abnormally within 0.3 s.

An oil pressure brake with a double-sealing structure comprises a brake pump body, a brake handle and an oil pipe assembly. The brake pump body is provided with a pressure cylinder and an oil storage cylinder, a piston push rod assembly acted by the brake handle is arranged in the pressure cylinder, and the pressure cylinder is communicated with the oil storage cylinder through an oil pressure adjusting hole. The piston push rod assembly comprises a front piston rod and a rear piston rod, a pushing cavity is formed in the rear piston rod, and the front piston rod can enter the pushing cavity; the front piston rod is provided with an oil guide cavity and an oil overflow hole; the front piston rod is further sleeved with a one-way piston oil seal, the one-way piston oil seal abuts against the inner wall of the pressure cylinder, and the one-way piston oil seal is located on the front side of the oil overflow hole. The hydraulic brake has the advantages that a new oil way is formed through the oil guide cavity and the oil overflow hole formed in the front piston rod, so that only one oil pressure adjusting hole is reserved between the pressure cylinder and the oil storage cylinder, only one one-way piston oil seal is used on the piston push rod assembly, and the brake use function can be achieved.

The invention discloses a friction stir welding closed type vacuumizing, heating and cooling shoe-shaped mold which mainly comprises an upper mold, an upper mold inner-layer flow channel welding sealing piece, an upper mold flow channel outer-layer welding sealing plate, a lower mold, a lower mold upper flow channel welding sealing plate, a lower mold lower flow channel welding sealing plate and a lower mold vacuumizing welding sealing plate. And the mold can be mounted on universal oil pressure equipment in the market for use through the bolt hole positions. And the upper mold is heated and cooled, and fluid enters from the upper mold runner inlet hole, the upper mold upper-layer runner and the upper mold lower-layer runner inlet hole, flows into the upper mold lower-layer runner, then flows back to the upper mold upper-layer runner from the upper mold lower-layer runner outlet hole, and flows out from the upper mold runner outlet hole. And the lower mold is heated and cooled, and fluid enters the lower mold upper runner from the lower mold runner inlet hole, flows to the lower mold vertical hole runner and the lower mold lower runner, and flows out from the lower mold lower runner outlet hole. According to the vacuumizing structure, a vacuumizing air hole in the bottom of a lower mold forming cavity is communicated with a lower mold vacuumizing hole air groove, a vacuumizing air hole in the side face of the lower mold forming cavity is communicated with a lower mold vacuumizing vertical air groove, and the lower mold vacuumizing vertical air groove is communicated with the lower mold vacuumizing hole air groove and a vacuumizing air exhaust hole. And air in the forming cavity of the lower mold is extracted outwards through the vacuumizing and air extracting hole.

The invention discloses a vehicle oil damper and an intelligent monitoring system thereof, and relates to the technical field of vehicle suspension systems, the vehicle oil damper comprises a dustproof sleeve, the dustproof sleeve is made of high-strength steel, the top of the dustproof sleeve is fixedly connected with an upper sealing plate through welding, and a first sealing ring is embedded in the bottom of the upper sealing plate; the surface of the first sealing ring makes contact with the inner wall of the dustproof sleeve, and the bottom of the upper sealing plate is fixedly connected with an airtight ring. According to the invention, by integrating a multi-dimensional sensor network and a data fusion algorithm, real-time, accurate and deep perception and fault diagnosis of the working state and the health state of the shock absorber are realized; according to the intelligent processing unit based on the heterogeneous multi-core architecture, various faults such as nitrogen leakage, sealing failure, oil emulsification and abnormal wear can be warned in advance, and the damping characteristic is compensated through the performance self-adaptive adjustment module, so that the reliability, safety and riding comfort of a suspension system are improved.

The invention relates to the technical field of shock absorption, and discloses a frequency self-adaptive shock absorber which comprises a cylinder body, a piston assembly and a frequency response structure. The piston assembly comprises a piston body and a piston rod. The frequency response structure is integrated in the piston rod and comprises a communicating channel, a mounting hole, an adjusting rod, an elastic piece and a plunger sleeve, the plunger sleeve is arranged in the communicating channel, a conical convex part is arranged at one end of the adjusting rod, an overflowing gap is formed between the peripheral face of the conical convex part and a port of the plunger sleeve, and the elastic piece is connected with the end, deviating from the plunger sleeve, of the adjusting rod. The frequency response structure is integrated in the piston rod, the elastic piece made of the nonlinear elastic material is used for sensing the oil pressure frequency change, the adjusting rod is driven to move in combination with the oil pressure, the damping force can be reduced at high frequency and increased at low frequency, and self-adaptive adjustment of the damping force of the shock absorber under high and low frequency vibration road conditions is achieved. According to the design, a complex frequency control valve does not need to be additionally arranged, and the cost, the structural complexity and the overall size of the damper can be remarkably reduced.

The invention provides a hierarchical dynamic control method and system for an oil pump fault mode, and the method comprises the steps: monitoring an actual oil pressure signal and a plurality of working condition parameter signals of an engine in real time, and carrying out the calculation based on the plurality of working condition parameter signals to obtain a target oil pressure signal; the difference value between the actual engine oil pressure signal and the target engine oil pressure signal is calculated, and whether the difference value is larger than a preset abnormal threshold value or not is judged; if the abnormal value is larger than the preset abnormal threshold value, it is judged that the oil pressure of the engine is abnormal, and whether the oil pressure abnormity belongs to the emergency situation or not is further judged; if the condition does not belong to the emergency condition, triggering early warning of a corresponding level according to the value of the difference value; if the non-highest-level early warning is triggered, the oil pressure state is detected again after preset time, and if the oil pressure is abnormal and still not recovered, a specific fault mode is diagnosed; and according to the diagnosed fault mode, the corresponding preset control strategy is called to control the fully variable oil pump, and the misjudgment rate is reduced.

The technical scheme belongs to the technical field of wood splitting devices, and particularly relates to a wood splitting machine which comprises a rack, a baffle, a wood splitting axe, a two-way rapid oil cylinder and a power unit. The two-way quick oil cylinder and the baffle plate are arranged on the rack; the wood breaking axe is installed at the driving end of the two-way rapid oil cylinder, the wood breaking axe is S-shaped, wood can be split more easily, and a working space used for containing the wood is formed among the rack, the baffle and the wood breaking axe; the power unit is integrated on the rack to provide oil pressure for the two-way rapid oil cylinder; the hydraulic control switch valve and the control valve are stacked and integrated into a whole through the two-way rapid oil cylinder. The main beam is arranged on the machine frame, the tail end of the main beam is bent and upwarped, the tail plate is embedded and welded to the tail end of the main beam, the reinforcing plates are arranged on the two sides of the tail plate, the main beam is formed by cutting an integral sectional material, and compared with a traditional main beam formed by welding three plates, machining procedures of the main beam are reduced; and the bent guide plate is additionally arranged between the baffle and the sliding rail on the main beam, so that the strength of the baffle is improved while residual wood grid chippings are conveniently cleaned.

The invention relates to the technical field of food industrial processing and intelligent processing, in particular to an intelligent temperature control system and method for circulating heating of frying oil, and the method comprises the following steps: a sensing acquisition module acquires an oil temperature analog signal and pipeline oil pressure change to generate a multi-dimensional data set; the prediction decision module generates a preliminary control instruction; the collaborative optimization module adopts a multi-target particle swarm optimization algorithm to adjust the heating power of a proportional burner, the rotating speed of a circulating pump motor and the opening degree of an electric flow control valve by taking temperature stability, energy consumption minimization and oil product protection as optimization targets; the adaptive learning module constructs a digital twinborn model, simulates oil flow thermodynamic behaviors through finite element analysis, and adopts a genetic algorithm to perform global parameter optimization. The problem that the oil temperature fluctuates greatly due to an on-off type temperature control strategy is solved, accurate and stable control over the oil temperature in continuous industrial production is achieved, and the quality consistency and the food safety of fried food are improved.

The utility model discloses a pinhole device for oil supply during deep hole processing, which comprises a cutter bar, a guide device, a support device and a pinhole protection connecting device are arranged on the cutter bar, the guide device comprises a combined bearing inner ring, and a conical disc is fixedly connected on the outer wall of the combined bearing inner ring through a bolt. The small hole protection connecting device integrally adopts a slender shaft structure to reduce the influence of oil pressure, the guide device and the supporting device are reduced in the same proportion on the original basis and are matched with the small hole connection protection device, the original functions are played at the same time, the contact area between cutting oil and a small hole device cavity is reduced, and the machining efficiency is improved. Therefore, oil pressure formed by cutting oil in the cavity is reduced, a gap, caused by too large oil pressure, of the contact face of the cutter bar and the workpiece is avoided, it is guaranteed that the cutter bar and the workpiece are tightly attached, the workpiece is prevented from falling off through positioning and clamping of the conical disc and the workpiece, deflection of the cutter bar during machining is avoided, and a high-precision guide track is established.

The utility model discloses an integrated bidirectional hydraulic pump station for a car arrester in a tank, which comprises a valve block, a bidirectional hydraulic pump, a motor, an oil tank, a car arrester driving oil cylinder, overflow valves and one-way valves, a left oil way and a right oil way are arranged in the valve block, the left oil way is provided with a first overflow valve, a first one-way valve and a fifth one-way valve, and the fifth one-way valve is a hydraulic control one-way valve. A second overflow valve and a second one-way valve are installed on the right oil way, and the second one-way valve is a hydraulic control one-way valve and is controlled by the oil pressure of the left oil way; an oil port A1 of the two-way hydraulic pump is connected with a piston cavity oil port of the car arrester driving oil cylinder through a left oil way, and an oil port B1 of the two-way hydraulic pump is connected with a piston rod cavity oil port of the car arrester driving oil cylinder through a right oil way. The left oil way is connected with the oil tank through a fifth one-way valve, and the fifth one-way valve is used for releasing additional backpressure generated in a piston cavity in the process that the two-way hydraulic pump drives a piston rod of the car arrester driving oil cylinder to retract. According to the utility model, the power consumption is reduced, the energy is saved, and the reliability of the system is improved.

The invention discloses a lubricating oil system of an aviation turboprop engine. The lubricating oil system comprises a lubricating oil supercharging device, an oil-gas separation device, a lubricating oil return device, a lubricating oil filtering device, a lubricating oil monitoring device and a connecting guide pipe communicating all the devices. The lubricating oil supercharging device comprises a main lubricating oil pump, an auxiliary lubricating oil pump and a torque measuring pump; the oil-gas separation device comprises a ventilation oil tank, an air separator and an oil mist separator; the lubricating oil return device comprises a lubricating oil tank, a lubricating oil radiator, a middle and rear bearing oil well pump, a transmission box oil well pump and a direct-current electric lubricating oil pump; the lubricating oil filtering device comprises a lubricating oil filter and a middle-rear bearing oil return filter; the lubricating oil monitoring device comprises a temperature metal chip annunciator and a magnetic chip detection annunciator. Appropriate lubricating oil pressure and oil quantity are provided, lubrication and heat dissipation of friction surfaces of parts in an engine are improved, and the use reliability of the engine is improved.

The invention relates to a control method for improving EDT roller texturing efficiency and high-surface automobile aluminum plate oil storage amount. The control method comprises the steps that (1) a single-rack cold rolling mill is adopted; (2) carrying out roller surface treatment by adopting an electrode electric spark roller grinder, wherein the roughness Ra of a working roller before roughening is less than or equal to 0.4 mu m; the roughness Ra after EDT roughening is equal to 1.95 to 2.2 [mu] m; (3) a single-rack cold rolling mill is adopted for production, the rolling oil temperature is 35 + / -5 DEG C, and the rolling oil pressure is 6.0-9.0 bar; (4) an air cushion type continuous annealing line is adopted for cleaning and solid solution aging treatment; (5) carrying out surface appearance and pit size measurement on the prepared aluminum plate by adopting a 3D optical microscope; and (6) the manufactured aluminum plate is measured through a 3D non-contact optical contourgraph. By means of the method, the requirements for the surface roughness Ra and Rpc of the automobile sheet can be met, the downstream stamping cracking risk and the corrosion spot defect caused by the too large surface pit diameter are reduced, the better high-surface automobile sheet, the higher aluminum sheet surface oil storage amount and the lower friction coefficient can be obtained, and the EDT roller texturing working time can be saved.

The invention relates to a thin-wall circular ring one-time forming layered trepanning machining method, and belongs to the technical field of machining. The machining method is characterized by comprising the following steps that (a) a disc blank is clamped on a four-jaw chuck of a lathe, and the outer circle clamping position is adjusted, so that the coaxiality jerk value of the center position of the disc blank and a main shaft of the lathe is smaller than or equal to 0.05 mm; (b) according to the machining number of the thin-wall circular rings, layered machining is conducted in sequence from outside to inside, and rough machining grooving, finish machining inner hole / outer circle and conical surface angle compensation turning are conducted on each layer in sequence; (c) an outer circle clamping mode and an inner hole tight supporting clamping mode are dynamically switched, the clamping force is adjusted in a self-adaptive mode according to the clamping position of the chuck, and the oil pressure is controlled to be 0.8-1.2 MPa; and (d) cutting off and separating the part by adopting an inner hole groove cutter, wherein the feed amount is less than or equal to 0.1 mm / r. The method has the advantages that one-time forming machining of the thin-wall circular ring is achieved through a layered trepanning strategy and dynamic clamping compensation, and the problems that a traditional process tool is high in dependency and low in machining precision are solved.

The invention discloses a screw compressor slide valve adjusting mechanism with an oil-pressure-free unloading function. The screw compressor slide valve adjusting mechanism comprises a flow piston, a volume ratio piston, a volume ratio slide valve, a flow slide valve, a compression spring, a guide rod, a three-position four-way electromagnetic reversing valve, a valve seat, a steering engine and a valve element. The valve element is rotatably installed in the valve seat and driven by the steering engine to rotate, and the valve element is provided with an internal channel structure and can be driven to rotate to different working positions so as to control communication between the oil pipe and the oil cavities, so that the flow of the flow sliding valve and the volume ratio of the volume ratio sliding valve are selectively adjusted. According to the screw compressor slide valve adjusting mechanism with the oil-pressure-free unloading function, an oil pump does not need to provide high oil pressure, the flow load of the compressor can be reduced to the minimum, the compressor gets rid of dependence on the oil pump, unloading is carried out by utilizing downtime, the starting time is shortened, and the structure is more simplified.

The invention provides a reverse circulation drilling device with a reaming function and a using method thereof.The reverse circulation drilling device comprises a drill rod, the drill rod is hollow to form a main pipeline, the bottom of the drill rod is sleeved with a composite drill bit, and the composite drill bit comprises at least one down-the-hole hammer and at least one oil pressure hammer; one part of the down-the-hole hammer extends out of the bottom surface of the shell of the composite drill bit; the oil pressure hammer is arranged in the circumferential direction of the shell of the composite drill bit and can stretch out or retract in the radial direction of the shell of the composite drill bit. The reverse circulation drilling device comprises the composite drill bit, the composite drill bit is provided with the oil pressure hammer and the down-the-hole hammer, the oil pressure hammer can be used for reaming, the down-the-hole hammer can be used for drilling, the oil pressure hammer can be withdrawn when not working, follow-up drilling is not affected, and the composite drill bit can achieve reaming and vertical drilling at the same time; in actual construction, time for replacing the drill bit can be saved, construction efficiency is improved, and time and cost are greatly saved.

The utility model relates to a tilting-pad sliding bearing of a steam turbine. The tilting-pad sliding bearing comprises a pad body, a pad block and an oil retainer, the multiple tile blocks are evenly distributed on the inner ring of the tile body in the circumferential direction, and the oil retaining rings are arranged on the two axial sides of the tile body. Two adjacent tiles are provided with mounting spaces in the circumferential direction of the inner rings of the tile bodies, shaft lubricating assemblies used for supplying oil to the positions between the tiles and the rotor are arranged in the mounting spaces, oil spraying holes are formed in the shaft lubricating assemblies, and the oil spraying holes are formed towards inlets in the oil inlet sides of the tiles; a jacking shaft device is arranged on the tile block at the bottom of the tile body inner ring and used for supporting the rotor; and the jacking shaft device adopts a one-way valve to supply oil to a jacking shaft oil bag through a tile block side wall channel. The bearing provided by the utility model can enhance the cooling effect of the pads, the temperature of an oil film is easier to adjust and control, and collision and abrasion caused by sudden loss of jacking oil pressure in the starting process can be avoided.

The invention discloses an industrial multi-source data fusion method based on causal inference in the technical field of computer data processing, and the method is applied to an aero-engine, and comprises the steps: obtaining the original performance data of the aero-engine, carrying out the normalization processing of the original performance data, and obtaining a target variable, the original performance data comprises rotating speed, exhaust temperature, oil pressure, oil temperature and metal abrasive particle component data; constructing a causal inference algorithm to calculate a dynamic threshold value; the causal intensity of each variable pair is calculated from the candidate causal set, variables with the first M ranks of the causal intensity are selected to form an optimization condition set, and a test algorithm is constructed; constructing a symmetric causal intensity matrix; and on the basis of the target variable and the feature matrix, performing quadrature to obtain a new data set after dimension reduction. By constructing the causal inference algorithm, the interpretability and generalization ability of the model can be enhanced, the performance stability is improved, the application range in the industrial field is expanded, and the calculation burden is relieved.

A control method and control apparatus for an electronic oil pump, applied to a vehicle. The control method comprises: after an engine of a vehicle is started, detecting whether a pressure measurement device has a fault; when the pressure measurement device does not have a fault, on the basis of real-time oil state parameters and real-time working condition parameters of the engine, determining a target requested rotation speed corresponding to an electronic oil pump, wherein the real-time oil state parameters at least comprise a real-time oil temperature and a real-time oil pressure, and the real-time working condition parameters at least comprise a real-time engine rotation speed and a real-time engine torque; and, on the basis of the target requested rotation speed, controlling the oil pump rotation speed of the electronic oil pump.

The utility model relates to the field of aviation mechanical parts, in particular to aviation mechanical part reliability life analysis pressure detection equipment which comprises a workbench and is used for aviation mechanical part life analysis pressure detection. According to the pressure detection equipment for reliability and life analysis of the aviation mechanical part, through the arrangement of the protective cover, the sealing door, the electric heater, the hydraulic cylinder, the hydraulic pump, the connecting sleeve, the pressure sensor, the contact block, the driving signal controller and the display, the aviation mechanical part is placed on the placing plate, and the sealing door is closed; then multiple sets of electric heating devices on the two sides in the protective cover are turned on, the interior is heated through the electric heating devices, then a hydraulic pump switch is turned on, oil pressure is generated in the interior to push a hydraulic cylinder and a contact block at the lower end to press downwards, and therefore pressure detection is conducted on the mechanical parts; and data obtained by a pressure sensor above the contact block is transmitted to a driving signal controller, and then the driving signal controller transmits the data to a display for observation and analysis.

The invention provides a precision seamless steel tube cold drawing process quality on-line evaluation method, and relates to the technical field of precision seamless steel tube processing, and the technical scheme is as follows: collecting hydraulic cylinder double-cavity oil pressure and steel tube displacement data in real time, and dynamically calculating five parameters including drawing force, change rate, accumulative impulse, rigidity and tensile stress; and establishing a five-stage progressive anomaly judgment mechanism by combining a drawing force reference objective function constructed by historical qualified data: firstly, capturing a pipe breakage risk based on instantaneous overrun of a drawing force change rate; secondly, the work hardening cumulative effect is recognized through the continuous abnormal frequency; and depth verification is carried out by combining an accumulated impulse boundary, a rigidity theoretical range and a material strength threshold value. The method has the beneficial effects that online monitoring of the whole process of the cold drawing process is achieved, the abnormal response speed is greatly increased, and waste of raw materials is reduced; and meanwhile, the consistency of the yield strength of the product is improved by quantifying the work hardening effect, and a process knowledge base is constructed to drive intelligent manufacturing iterative optimization.

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 an underwater plugging technology of a watertight connector, and aims to provide a test device of an underwater plugging connector and a control method thereof, and the key points of the technical scheme are that the test device comprises a sealing test cabin which comprises a cylindrical cabin body, an upper end cover and a lower end cover; the plugging mechanical assembly comprises a guide structure arranged in the cabin body, a socket fixing plate is coaxially arranged in the middle of the cabin body, a support fixing plate is coaxially arranged in the cabin body close to the bottom, a plug moving plate located between the socket fixing plate and the support fixing plate is coaxially arranged in the cabin body, and a telescopic oil hydraulic cylinder is arranged on the top surface of the support fixing plate; an oil inlet and an oil outlet of the telescopic oil hydraulic cylinder are fixedly connected with oil pipes respectively, and the other ends of the oil pipes are fixedly connected with an external hydraulic oil source. The underwater motor assembly is used for generating simulated water flow in the cabin; the pressure adjusting module is used for simulating underwater pressure at different depths; the control system is used for controlling all the parts to operate cooperatively; the invention is suitable for the technical field of underwater plugging of the watertight connector.

The invention discloses a method for predicting the service life of a dynamic sealing structure under a high-speed working condition, and the method is characterized in that the method comprises the steps: measuring the sealing dynamic oil pressure, the sealing temperature, the medium leakage rate and the abrasion loss of the dynamic sealing structure through a testing system, and carrying out the pressure maintaining performance and service life analysis of the measured parameters in combination with an abrasion model and an aging model; the method can solve the problems of safety accidents caused by sealing failure of the dynamic sealing structure under extreme working conditions, difficulty in detecting the service life state to replace on schedule and the like, and provides a reference scheme and an enabling technology for service life analysis of the high-rotating-speed, high-pressure and long-service-life dynamic sealing structure. The operation safety of the dynamic sealing structure is improved, and the operation cost is reduced.

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 invention relates to an intelligent slope compensation tensioning and holding load detection system which comprises a control host, a PLC, an oil pump motor, an electromagnetic valve set, a main jacking jack, a locking jacking jack, a pressure sensor and a displacement sensor. The three working modes of primary detection, compensation tensioning and secondary detection are supported, and parameters are independently stored in each mode; the PLC dynamically executes staged pressurization, load holding and pressure maintaining and closed-loop pressure supplementing based on a C02 / C03 threshold value according to the actually measured oil pressure and the displacement signal, and the elongation amount is automatically checked; the system has the functions of power-off continuation, abnormity self-inspection, local data recording and remote uploading, and safe reset is achieved through a pressure relief solenoid valve. According to the method, intelligentization, closed loop and data collaboration of the whole operation slope anchor cable tensioning process are achieved, and the engineering requirement for held load distribution type judgment is met.