9582 results about "Cylinder (engine)" patented technology

To provide a bi-fuel vehicle capable of preventing a driver from feeling bothered even in a situation where restart occurs frequently.SOLUTION: A bi-fuel vehicle is equipped with an engine 2 to which one of two types of fuel: CNG, which is gaseous fuel; and gasoline, which is liquid fuel, selected and supplied as fuel to be injected into a combustion chamber of each cylinder, and comprises an ECU 8 that controls an idling stop function that stops the engine 2 when a preset automatic stop condition is established and restarts the engine 2 when the preset restart condition is established. The ECU 8 selects gasoline as the fuel to be injected into the combustion chamber of each cylinder of the engine 2 when it is predicted that automatic stopping and restarting of the engine 2 may be repeated a predetermined number of times or more within a predetermined time.SELECTED DRAWING: Figure 1

The invention provides a low-speed and ultrahigh-pressure die-casting process method for automobile part die-casting, and relates to the field of automobile part manufacturing. The method includes the following steps that firstly, a mold is prepared, secondly, molten metal is prepared, thirdly, a casting is cooled and demolded, and fifthly, follow-up treatment is conducted. The defects that in the high-speed mold filling process of a common high-pressure casting technology, gas is likely to be involved in the molten metal, and consequently air holes, shrinkage porosity and the like are generated in the casting are overcome; and when key parts such as automobile engine cylinder bodies and hubs are produced, air hole defects possibly cause the problems of air leakage of engines, insufficient hub strength and the like. And meanwhile, for parts with thin walls and complex structures, uniform filling of molten metal in a mold is difficult to ensure by a traditional die-casting process, the defects of cold shut, insufficient pouring and the like are easy to occur, and the qualified rate and the production efficiency of products are reduced.

The invention provides a multi-dimensional supporting leg structure for lightweight steel ring splicing equipment, and relates to the field of tunnel engineering. The mounting base is fixedly connected with the frame, the telescopic driving mechanism is arranged between the mounting base and the supporting leg assembly, the angle adjusting mechanism is arranged between the cylinder barrel and the mounting base, and the self-locking mechanism is used for locking the cylinder barrel and the piston rod when the driving unit fails. The telescopic driving mechanism is composed of a cylinder barrel, a piston rod and a driving unit, the angle adjusting mechanism is driven through a first rotating shaft and a second rotating shaft which are perpendicular to each other and corresponding rotation, so that the cylinder barrel achieves double-shaft swing adjustment, the self-locking mechanism is composed of a locking rack, a movable tooth claw, a reset spring, an electromagnet and a permanent magnet, and power-on unlocking and power-off self-locking are achieved. According to the structure, the supporting polygon is obviously enlarged under the complex basic condition, the anti-overturning stability of equipment is improved, reliable supporting is kept when a hydraulic system fails, and the safety and adaptability of steel ring splicing operation in a tunnel are improved.

The invention relates to the technical field of oil nozzles, in particular to an efficient atomization injection system for a direct injection oil injector in a cylinder. According to the technical scheme, an injection execution unit adopts a laser-cladded asymmetric injection hole array, fuel oil is evenly distributed in a combustion chamber through aperture gradient distribution and logarithmic spiral arrangement, and the oil-gas mixing effect is enhanced. The dynamic pressure adjusting unit is integrated with an MEMS film sensor array and a fuzzy neural network controller, a sensor can accurately monitor fuel oil pressure in real time, and the controller is based on a 7-12-3 type BP network and can rapidly and accurately adjust fuel injection pressure according to the working condition of an engine through mass data training. The fuel oil pretreatment unit comprises an ultrasonic cavitation device and a graded heating system, the ultrasonic cavitation device reduces the viscosity of fuel oil, and the graded heating system accurately controls the temperature by means of a PTC heater, a semiconductor laser and a vortex generator. The three units work cooperatively, the fuel oil atomization and combustion efficiency is greatly improved, pollutant emission is reduced, and the engine performance is remarkably improved.

The invention relates to the technical field of petroleum engineering downhole tools and hydraulic anchor equipment, in particular to an anchoring pressure adjustable hydraulic anchor which comprises a body with a spherical mounting cavity, a plurality of groups of elastic anchor flukes, a universal cylinder core and a flexible diaphragm. A hydraulic cavity is formed in the universal cylinder core, a flexible diaphragm is fixed to the outer side, and the elastic anchor flukes are driven through hydraulic through holes. Under hydraulic driving, the flexible diaphragm expands to push the elastic anchor flukes to stretch out to achieve anchoring. And the universal cylinder core allows angular deflection, so that the adaptability to a bent or irregular shaft is enhanced. The flexible belt is connected with the universal cylinder core and the body to adapt to deviation, and the limiting ring is arranged to prevent excessive expansion from affecting work. The upper connecting cylinder and the body are detachably connected in a sealed mode, and maintenance is convenient. By means of the design, the problem that a traditional rigid structure hydraulic anchor is poor in angle self-adaptive capacity under complex geological conditions is solved, anchoring stability and environmental adaptability are improved, and the hydraulic anchor is suitable for various complex underground conditions.

The invention relates to the technical field of tensile tests, and discloses a building sealant stretching performance test device, which comprises a test box, a first clamp, a loading block, a linear driver and a driving mechanism, a door plate is mounted on the front of the test box; the first clamp is installed at the top in the test box, the loading block is arranged in the test box, located below the first clamp and driven by the linear driver to move up and down, a through loading channel is formed in the loading block, and a cylinder is arranged in the loading channel and driven by the driving mechanism to rotate; a through assembly channel is formed in the cylinder body, and a transversely-arranged guide rail body is installed in the assembly channel. According to the invention, by carrying out stretching, torsion, inclined stretching, tearing stretching, winding stretching and testing in a low-pressure environment on the sealant, the mechanical properties of the sealant under complex working conditions can be comprehensively evaluated, the testing precision and reliability are improved, the actual engineering requirements are met, and meanwhile, the testing safety and environmental protection property are ensured.

The invention discloses a welding device and method for a rocket engine jet pipe, and belongs to the technical field of aerospace engine welding. The welding device for the rocket engine jet pipe comprises a first tool used for clamping a to-be-welded scalloped segment of the engine jet pipe, a second tool used for clamping a to-be-welded barrel and a gas protection supporting cover used for conducting inert gas protection on the front face of a welding seam of the engine jet pipe. The first tool comprises a first inner supporting piece, the first inner supporting piece is sleeved with a pressing plate, and the pressing plate is provided with a first pressing structure for pressing the edge of the scalloped segment; the second tool comprises a second inner supporting piece and a third inner supporting piece which are used for supporting the barrels, and a pressing mechanism for pressing the splicing positions of the adjacent barrels is arranged outside the second inner supporting piece or the third inner supporting piece. By the adoption of the welding device and method for the rocket engine jet pipe, the problems that an existing engine jet pipe is prone to being oxidized when welded in the atmosphere, defects are generated, and the welding cost is high can be solved.

An internal combustion engine has a uniblock that defines a blind cylinder bore that terminates within the uniblock. A piston is inserted into the cylinder bore from a bottom end of the cylinder bore. Parallel first and second vertical planes extend along first and second lateral sides of the cylinder bore. A cylinder zone being defined between the first and second vertical planes. A crosshead is coupled to the piston. A first crankshaft has a first crankshaft axis that extends parallel to the first vertical plane and that is positioned outside of the cylinder zone. A second crankshaft has a second crankshaft axis that extends parallel to the second vertical plane and that is positioned outside of the cylinder zone. The first crankshaft is coupled to the crosshead with a first connecting rod and the second crankshaft is coupled to the crosshead with a second connecting rod.

The invention discloses a variable environment fuel oil atomization quality test system and test method. The system comprises a high pressure common rail injection system, a low temperature refrigeration system, an electronic control system, an image data acquisition system and an environment test chamber. The low-temperature refrigerating system reduces the temperature of fuel oil in the oil injector through convective heat exchange; the environment test cabin simulates the environment air pressure, temperature and humidity in the cabin according to the actual environment parameters in the cylinder in the engine operation process; the image data acquisition system acquires spray image information of low-temperature fuel oil in a variable environment and performs image processing, and by actually measuring the circulating oil injection quantity during fuel oil injection, the Sott average diameter is calculated according to different empirical formulas, and the fuel oil atomization characteristics are comprehensively analyzed. The invention provides a reliable experimental means for researching the fuel oil atomization condition of the fuel oil in a low-temperature state in a low-temperature environment in the cold start process of the engine, deeply analyzing the influence of a complex environment on the cold start of the engine, and seeking to improve the cold start performance of the engine.

The invention discloses a long-distance spraying dust-settling machine for engineering construction, which comprises an arranged water storage tank, a first motor is arranged in the water storage tank, a first output end of the first motor is connected with a rotating assembly, the rotating assembly is connected with a rotating seat, a second motor is arranged in a protective cylinder, and the second motor is connected with a second motor. A first air bag is arranged on the outer side of the rotating shaft and communicates with a second air bag through a pipeline, and the second air bag is arranged at the side end of the spray head. According to the long-distance spraying dust-settling machine for engineering construction, through swinging of a protective cylinder, the spraying coverage range of a spray head can be enlarged, dust settling comprehensiveness is improved, the problem that the dust settling efficiency is reduced due to insufficient driving force is solved, the output end of a second motor drives a rotating shaft to rotate, a fan on the outer side of the rotating shaft can rotate conveniently, and the dust settling efficiency is improved. And air in the first air bag is conveniently conveyed to the second air bag, so that the spray head rotates on the rotating shaft, and the dust falling effect is enhanced.

The invention relates to a composite injection hydrogen internal combustion engine and an injection control method thereof, and the composite injection hydrogen internal combustion engine comprises an air inlet system, a low-pressure air inlet channel hydrogen supply system, a high-pressure in-cylinder direct injection hydrogen supply system, an ignition system and a control system, the control system dynamically adjusts the ratio of low-pressure gas inlet channel hydrogen injection to high-pressure cylinder internal direct injection hydrogen by correspondingly controlling the working states of the gas inlet system, the low-pressure gas inlet channel hydrogen supply system and the high-pressure cylinder internal direct injection hydrogen supply system, and specifically, the ratio of low-pressure gas inlet channel hydrogen injection to high-pressure cylinder internal direct injection hydrogen injection is adjusted according to the rotating speed and target power of an engine. The proportion of air inlet channel injection and in-cylinder direct injection is dynamically adjusted. Compared with the prior art, a composite double-injection mode is introduced, more accurate combustion control can be achieved, higher flexibility and adaptability are provided, the performance and combustion efficiency of the hydrogen internal combustion engine can be optimized within a wider working condition range, and the combustion stability and fuel economy of the engine are effectively improved.

The invention relates to the technical field of cooling water pumps for engines, and particularly discloses an electronic water pump which comprises a water pump shell, an impeller, a middle shaft, a stator assembly and a rotor assembly, one end of the water pump shell is in butt joint with a volute cavity in an engine cylinder, a mounting cavity is integrally formed in the water pump shell, and a PCB is mounted in the mounting cavity; a flow channel is formed in the center of the center shaft, a plurality of liquid drainage holes are formed in the part, located in the cavity, of the center shaft in a surrounding mode in the radial direction and located in the end, away from the impeller, of the cavity, a plurality of through holes are further formed in the water pump shell, and the two ends of each through hole communicate with the cavity and the volute cavity correspondingly. The middle shaft further communicates with a first conveying pipe; a plurality of cooling channels are formed in the part, between the mounting cavity and the cavity, of the water pump shell at intervals, one end of each cooling channel communicates with the volute cavity, and the other end of each cooling channel communicates with the first conveying pipe through a second conveying pipe; the electronic water pump can respectively cool the motor and the PCB according to the cooling requirements of the motor and the PCB.

A pre-ignition prevention system for a turbulent jet ignition (TJI) engine having dual spark plugs includes an ion sensing system and a controller configured to receive the ion sense signal from the ion sensing system, detect, using the ion sense signal, a misfire event where a firing of a first spark plug fails to completely combust a fuel / air pre-charge in a pre-chamber of a cylinder of the TJI engine, in response to detecting the misfire event, detect, using the ion sense signal, an exhaust stroke heat release event after a firing of the second spark plug indicative of a remaining portion of a primary fuel / air charge in the main chamber and, in response to detecting the exhaust stroke heat release event, adjust fueling for at least one subsequent combustion cycle to prevent pre-ignition of the remaining portion of the primary fuel / air charge in the main chamber.

The invention relates to the technical field of aero-engines, and discloses a second outer culvert adjusting mechanism suitable for variable cycle engine mixed exhaust, which comprises a main duct convergence adjusting sheet, a second outer culvert adjusting sheet, a main duct expansion adjusting sheet and a second outer culvert adjusting assembly, a second outer duct is formed between the second outer duct adjusting piece and the main duct convergence adjusting piece, and the second outer duct adjusting assembly is used for adjusting the angle of the second outer duct adjusting piece and the angle of the main duct convergence adjusting piece so as to control opening and closing of an outlet of the second outer duct. The second outer culvert adjusting mechanism is simple in structure, adjustment of the throat opening area of the second outer culvert is achieved through different elongation amounts of the actuator cylinders, and the second outer culvert adjusting mechanism has high adjusting capacity and can be flexibly adjusted according to the running state and exhaust requirements of the engine so as to achieve the optimal exhaust effect and engine performance.

The invention discloses a modularized replaceable self-resetting energy consumption type bridge pier anti-collision system, and belongs to the technical field of bridge engineering structure safety. The system includes an annular rubber pad, an annularly disposed damper module, and a shape memory alloy (SMA) tow. The damper module comprises a cylinder body, high-viscosity fluid, a reset spring, a piston and a force transmission plate. The cylinder body is fixed to the pier in a surrounding mode through bolts and rubber pads, the inner wall of the cylinder body is connected with the piston through a reset spring, the piston rod end is hinged to the force transmission plates, and the SMA wire bundles are connected with the force transmission plates. When an external impact load acts on the force transmission plate, the fluid damper provides viscous energy consumption, and the SMA wire bundle, the spring and the rubber pad provide deformation energy consumption; after the collision is finished, the system can be reset to the initial position under the synergistic effect of the SMA wire bundle, the spring and the rubber pad. By means of the modular design, efficient energy consumption and self-resetting can be achieved; and meanwhile, a single damper can be quickly replaced after being damaged, so that the maintenance efficiency and the system recoverability are greatly improved.

The invention discloses a method for calculating stress and deformation of a roller carrier supporting thin-walled cylinder under the action of dead weight, which comprises the following specific steps of: S1, calculating the bending moment and deflection of a cylinder body in the longitudinal direction by adopting an overhanging beam model in the longitudinal direction, and determining the optimal position of the roller carrier in the longitudinal direction according to the maximum bending moment minimization and the maximum deflection minimization of a beam; s2, transversely utilizing symmetry to establish a semicircular curved beam model, and calculating bending moment and displacement in a transverse plane of the cylinder by adopting a Temosinke beam theory; s3, calculating the maximum stress in the cylindrical surface according to the in-surface bending moment, and determining the optimal half wrap angle required by the strength; and S4, calculating the ovality and root-mean-square roundness of the curved beam according to the displacement, and determining the optimal half wrap angle required by deformation. According to the method, the maximum stress and the deformation shape of the thin-walled cylinder are accurately predicted, and the optimal wrap angles of the roller carrier under the strength requirement and the deformation requirement can be determined to be 67.4 degrees and 90 degrees respectively, so that the optimal wrap angle is suggested to be between 67.4 degrees and 90 degrees in engineering.

The invention relates to the technical field of structural engineering shock isolation, in particular to a quasi-zero stiffness shock isolation device based on hydraulic negative stiffness and a design method thereof. A quasi-zero stiffness shock isolation device based on hydraulic negative stiffness comprises a vertical bearing unit which comprises at least one vertical spring, and the two ends of the vertical spring are connected to the top face of a lower connecting plate and the bottom face of an upper connecting plate respectively; the negative stiffness unit comprises a hydraulic oil cylinder and a piston rod, the piston rod extends into the hydraulic oil cylinder, and the hydraulic oil cylinder and the piston rod are hinged to the lower connecting plate and the upper connecting plate respectively, or the hydraulic oil cylinder and the piston rod are hinged to the upper connecting plate and the lower connecting plate respectively; the distance between the upper connecting plate and the lower connecting plate is increased or decreased to drive the length of the piston rod extending into the hydraulic oil cylinder to change so as to provide negative stiffness. The problems that in the prior art, when a nonlinear vibration isolation system provides negative stiffness in a metal horizontal spring compensation mode, a quasi-zero stiffness working zone is narrow, the bearing capacity is low, and the requirement for installation precision is high are solved.

The utility model relates to the technical field of air tightness detection, and discloses an air tightness detection device for an automobile engine cylinder cover, which comprises a detection box, supporting cylinders are fixed at four corners of the outer wall of the detection box, a top cover is arranged on the top surface of the detection box, and the detection box and the top cover are made of sound insulation plates. And detection assemblies are arranged in the detection box and on the top surface of the top cover, and each detection assembly comprises a placement frame fixed on the bottom surface of the top cover. According to the utility model, a cooling system filled with an engine cylinder cover is filled with gas through the air pump, then the hydraulic cylinder is started to drive the placement rack to move into the detection box, and the detection box and the top cover are made of sound insulation plates, so that the interior of the detection box is kept in a quiet and relatively closed environment; at the moment, the engine cylinder cover is detected in four directions through the four ultrasonic receivers, and when leaked gas passes through a leakage hole, ultrasonic waves are generated and detected, so that airtightness detection of the engine cylinder cover is realized.

The invention relates to an exhaust resonance tube of a two-stroke horizontally-opposed four-cylinder piston engine, which belongs to the field of two-stroke engines and comprises an exhaust manifold, a connecting component, an exhaust manifold and a tension spring component. One end of the exhaust manifold is provided with four branch air channels, and the other end of the exhaust manifold is a main air channel where the branch air channels converge. The four branch air passages are correspondingly connected with four exhaust ports of an engine respectively, and an air outlet of the exhaust manifold main air passage is in elastic airtight connection with an air inlet of the exhaust manifold through a connecting assembly. The exhaust manifold is a return reducing pipe, sequentially comprises a thin pipe section, a first diverging pipe section, a second diverging pipe section, an expansion pipe section, a rear taper pipe section and an exhaust tail pipe section and is used for adjusting contraction and expansion of exhaust waves in the exhaust manifold, and the phenomenon of back pressure is avoided. The tension spring assembly is used for vibration decoupling between the exhaust resonance tube and the engine. The two-stroke horizontally-opposed four-cylinder piston engine solves the problems that an existing two-stroke horizontally-opposed four-cylinder piston engine for the unmanned aerial vehicle has short-circuit loss, and the power is obviously reduced within a certain rotating speed range.

The utility model provides a gas engineering pipeline plugging device which comprises a fixing ring, a threaded cylinder and a plugging table, a plurality of threaded holes are formed in the circumferential wall of the fixing ring, the threaded holes are evenly distributed, each threaded hole is in threaded connection with a clamping rod, the clamping rods are used for clamping a gas pipeline, and the plugging table is used for plugging the gas pipeline. The threaded barrel is connected to the fixing ring through a plurality of connecting rods and is coaxial with the fixing ring, the plugging table is in a circular truncated cone shape, a threaded shaft is arranged at the large end of the plugging table and matched with the threaded barrel, and when the threaded shaft rotates, the threaded barrel is connected with the plugging table through the connecting rods. The blocking table can move in the axial direction of the fixing ring so that the circumferential face of the blocking table can abut against the inner edge of a pipe opening of the gas pipeline. According to the gas pipeline plugging device, the plugging table is in the circular truncated cone shape, gas pipelines of various sizes can be plugged, replacement is not needed, the application range of a product is widened, and the adaptability of the product is improved.

The invention discloses a concrete waterproof coating performance testing method and device, belongs to the technical field of waterproof material performance detection, and aims to improve and optimize a sample detection mode and a detection method based on a conventional water pressure penetration testing principle. Samples forming an annular structure can be conveniently placed in a detection cylinder, multiple groups of waterproof coatings on the samples correspond to multiple detection cavities in a one-to-one mode, multiple samples can be detected in the same group, forward water pressure testing from outside to inside and then reverse water pressure testing from inside to outside are adopted, and the samples do not need to be replaced in the testing process; in the successive pressurization gap of the positive and negative water pressure test, the waterproof coating is repeatedly dried through the heating plate, the repeated waterproof environment of the waterproof coating in the actual engineering is simulated, and the detection accuracy is improved.

A deep engineering hard rock true triaxial dynamic disturbance aging fracture testing device belongs to the technical field of rock mechanics tests and comprises a counter-force frame, a pressure chamber and six main stress linear disturbance actuators. The main stress linear disturbance actuator comprises a linear disturbance motor and a main stress hydraulic cylinder; the linear disturbance motor is coaxially and fixedly installed at the outer end of a cylinder barrel of the main stress hydraulic cylinder, a dowel bar is arranged in a central hole channel of a piston rod of the main stress hydraulic cylinder, and a power output shaft of the linear disturbance motor is coaxially and fixedly connected with the dowel bar. According to the utility model, the matching form of a traditional dynamic actuator and a hydraulic oil source is abandoned, the linear motor is introduced into the true triaxial test equipment as a power disturbance source, the long-time dynamic disturbance structure of the true triaxial test equipment is simplified, and the energy consumption of the equipment is greatly reduced after the linear motor is used as the power disturbance source; the maintenance process is simpler, the maintenance cost is greatly reduced, the installation and debugging processes of the linear motor are more time-saving and labor-saving, and no extra floor area is needed.

The invention relates to the field of pipeline detection, in particular to a pipeline leakproofness detection device for constructional engineering construction detection, which comprises a base, a detection cylinder is mounted above the base, a first plugging piece is movably connected in the detection cylinder, and the first plugging piece seals the end part of a to-be-detected pipeline and clamps and fixes the pipeline. The pipeline is driven to move; a first plugging piece is installed at one end of the pipeline, a second plugging piece is installed at the other end of the pipeline, an air hole is formed in the second plugging piece, and air is injected into the pipeline after the two ends of the pipeline are plugged through the first plugging piece and the second plugging piece; the transmission assembly comprises a horizontally-arranged transmission rod, the transmission rod is driven by a motor, a second gear is arranged on the transmission rod in a sliding mode, through the structure of the detection marking assembly, when the pipeline passes through the lower portion of the detection marking assembly, the position of the leakproofness defect on the surface of the pipeline is detected and marked, and therefore follow-up repair of the pipeline is facilitated; and the whole pipeline is prevented from being discarded to cause waste.

The invention discloses a self-adaptive downhole rock annular cutting groove stress unloading percussion bit and a drilling method, and belongs to the technical field of petroleum drilling engineering. The self-adaptive downhole rock annular cutting groove stress unloading percussion bit comprises a bit connector, a cutting groove unloading barrel body and a percussion bit body; the upper end of the percussion bit matrix is fixedly connected with the lower end of the bit joint; the upper end of the grooving unloading barrel matrix is in axial sliding fit with the lower end of the bit joint; a bit pressure transmission disc spring is arranged in an annular space between the bottom end face of the drill bit connector and the top end face of the annular step. A plurality of annular grooving unloading stress teeth are arranged at the lower end of the grooving unloading barrel matrix; impact crushing teeth are arranged at the lower end of the impact drill bit matrix; when the drill bit reaches the well bottom, the annular cutting groove unloading stress teeth make contact with the well bottom earlier than the impact crushing teeth. Through the structural arrangement of the drill bit, annular grooving of shaft bottom rock is achieved, shaft bottom stress is unloaded, the efficiency of impact rock breaking is improved by reducing the strength of the rock, and the drilling speed is increased.

The invention relates to the technical field of evanescent mode casting, and discloses a multi-cylinder diesel engine cylinder evanescent mode casting sand box which comprises a sand box body, a positioning frame is fixedly connected to the surface of the sand box body, a supporting rod is fixedly connected to the top of the positioning frame, a telescopic frame is fixedly connected to the bottom of the sand box body, and a motor is fixedly connected to the bottom of the inner wall of the telescopic frame. The positioning component comprises a bearing plate, and the surface of the bearing plate is in contact with the inner wall of the sand box. The positioning part is arranged in the sand box, the motor is started to drive the positioning part to start working, the positioning part can push a foam plastic mold into the sand box, the foam plastic mold is extruded and positioned in the downward moving process, and the stability of the foam plastic mold during installation is improved; and meanwhile, the positioning component can push the vibration component to start working when moving, vibration generated by the vibration component can be transmitted to the interior of the sand box, and gravel in the sand box can be continuously flattened through vibration.

The invention discloses a dual-fuel engine combustion method based on internal and external cooperative injection of a methanol engine, and belongs to the field of methanol fuel engines. The combustion method is realized on the basis of combustion of a diesel / methanol dual-fuel engine with internal and external cooperative injection of a methanol engine, a combustion chamber is formed by a cylinder cover, a cylinder and a piston, an internal and external concentric needle valve oil injector and an in-cylinder direct injection methanol injector are mounted on the cylinder cover, and a methanol port injector is mounted on an intake manifold; the high-reaction-activity diesel oil adopts a double direct injection technology; the low-reactivity methanol fuel adopts an in-cylinder high-low pressure injection and port fuel injection technology, the injection pressure, the injection timing and the injection frequency of the in-cylinder methanol injector are controlled, the gas distribution phase and the valve motion law are adjusted according to the operation condition of the engine, and mixed gas concentration layering of different gradients is formed. The ratio, the injection rule and the injection timing of the diesel oil and the methanol fuel can be flexibly adjusted, and stable operation of multi-mode combustion and high-efficiency clean combustion of the engine is achieved.

The utility model discloses a multi-wing-plate shared mooring anchor foundation suitable for a wave energy device, and relates to the technical field of ocean engineering, the multi-wing-plate shared mooring anchor foundation comprises an anchor cover located on the upper portion, a sleeve in the middle and a shared anchor foundation on the lower portion, the anchor cover comprises a circular plate, a connecting rod arranged on the top face of the circular plate and a cylinder arranged on the bottom face of the circular plate, and the cylinder is sleeved with the sleeve. The sleeve is connected with the anchor cover through a chain, the shared anchor foundation is a barrel with two open ends, a wing plate is arranged on the outer wall of the barrel in the axial direction, an inserting groove matched with the wing plate is formed in the lower portion of the sleeve, the sleeve is sleeved with the barrel, and a plurality of anchor eye connecting anchor chains are arranged on the outer wall of the barrel to form an array group shared anchoring system. After the shared mooring anchor foundation penetrates into a seabed by a certain depth, the anchor cover and the sleeve are lifted and removed, the shared anchor foundation is embedded in the seabed, the anchor cover and the shared anchor foundation are both installed in the sleeve, vertical penetration and lifting can be better achieved, the anchor cover and the sleeve are connected through the chain, internal suction force can be released during lifting, and the anchor cover and the sleeve are connected through the chain. And the dismounting difficulty is effectively reduced.

The invention relates to the technical field of detection and conveying, in particular to a steel structure engineering fastening detection device which comprises a first supporting frame, a second supporting frame, an alignment assembly, a loading assembly and a moving assembly, and the loading assembly comprises a loading air cylinder, a mounting block, a loading block and a deformation detection module; the moving assembly comprises a lifting air cylinder, a lifting block, a conveying roller, a first sliding block, an elastic piece and a driven roller, the first sliding block is arranged on the first supporting frame in a sliding mode, the elastic piece is arranged between the first sliding block and the first supporting frame, the conveying roller is rotationally arranged on the first sliding block, and the lifting block is fixed above the first sliding block; the output end of the lifting air cylinder is connected with the lifting block, and the driven roller is slidably arranged on the second supporting frame. The steel structure can be automatically driven to move for cyclic detection, so that the use is more convenient, and the working efficiency is improved.

The invention discloses an air-fuel ratio control method for a high-pressure direct injection engine in a diesel-natural gas dual-fuel cylinder, and relates to the technical field of engine control, and the air-fuel ratio control method comprises the following steps: collecting diesel mass flow, natural gas volume flow and natural gas component data, and determining a diesel-natural gas mixing ratio; a basic target air-fuel ratio is obtained by combining the real-time rotating speed of an engine, the load and the diesel oil-natural gas mixing proportion; based on the pressure and temperature of the intake manifold and the rotating speed of the engine, the target air-fuel ratio after model correction is obtained; the working condition load change rate is detected, the pre-optimized air-fuel ratio trajectory MAP is called, and a transient correction target value is generated; calculating the deviation between the transient correction target value and the measured value of the air-fuel ratio sensor and the deviation change rate, and outputting an air-fuel ratio correction value; and the final target air-fuel ratio is calculated and sent to an air flow control valve to execute air inlet adjustment. The method is suitable for engine application scenes requiring high-precision and self-adaptive control to improve combustion efficiency and reduce emission.

The invention relates to the technical field of engineering machinery manufacturing, in particular to an excavator part machining treatment device which comprises a fixing base, a support is fixedly connected to the fixing base, a driving mechanical arm capable of driving horizontal two-dimensional motion is installed at the top of the inner side of the support, and a sliding disc is fixedly connected to the lower end of the driving mechanical arm. The bottom face of the sliding disc is fixedly connected with a driving cylinder, and the lower end of the driving cylinder is fixedly connected with an inverted-U-shaped frame. According to the excavator part machining treatment device, three core procedures of drilling, inner wall grinding and end face grinding are integrated, through cooperative control of the driving mechanical arm, the driving air cylinder and the motor, full-process part machining can be completed without equipment replacement or repeated clamping, the part transferring and positioning time is effectively shortened, and the machining efficiency is improved. The problem that traditional step-by-step machining is low in efficiency is solved, and the machining efficiency is improved.