3003 results about "Crankshaft" patented technology

The invention discloses a digital twin intelligent test run system based on a marine medium-speed diesel engine and a monitoring method, relates to the technical field of monitoring, and is used for solving the problems of degeneration identification lag and low emission early warning precision of an oil injector. The system comprises a multi-source heterogeneous data preprocessing module and a running state intelligent diagnosis module. The multi-dimensional data acquisition module is used for acquiring in-cylinder pressure, crankshaft torsional vibration and transient air-fuel ratio signals to construct multi-dimensional data vectors, and the multi-dimensional data acquisition module is used for analyzing combustion fluctuation characteristics based on an attention mechanism LSTM (Long Short Term Memory) network, identifying early deterioration of an oil injector and outputting an oil injection consistency coefficient and a fault type identifier. The method comprises the steps that according to an oil injection consistency coefficient, electromagnetic valve response delay and combustion parameter correlation are tracked, a degradation trend is predicted, and emission early warning is generated; and according to prediction and early warning results, fuel injection compensation parameters are dynamically adjusted in the digital twinborn model, a recursive least square method is adopted to identify combustion parameters and feed the combustion parameters back to an electric control unit, and self-adaptive optimization and closed-loop control in the test run stage are achieved.

The invention particularly relates to a grinding force closed-loop control and flutter suppression system for crankshaft variable stiffness machining, and aims to solve the problems of unstable grinding force, flutter and surface defects caused by time-varying stiffness characteristics of a crankshaft due to a multi-crank throw and cantilever supporting structure. The system comprises a grinding force detection module, a control module and an execution module. The grinding force detection module is arranged in a grinding wheel and crankshaft contact area and collects grinding force signals in real time. The control module receives an actual grinding force signal, compares the actual grinding force signal with a target value, and outputs a compensation instruction and a suppression instruction; the compensation instruction is generated by adopting a self-adaptive PID or fuzzy PID algorithm based on force deviation, and the grinding wheel feeding speed or the main shaft rotating speed is dynamically adjusted to stabilize the grinding force; and extracting a high-frequency component of the force signal as a flutter feature, identifying a flutter bud through time-frequency analysis, and generating an anti-phase displacement instruction to suppress flutter. The execution module adjusts feeding or rotating speed according to the compensation instruction and adjusts radial displacement of the crankshaft or the grinding wheel according to the suppression instruction.

The invention discloses a compressor crankshaft high-precision 3D shape detection method based on laser vision, belongs to the technical field of precision measurement and intelligent manufacturing, and aims to solve the problems existing in crankshaft detection. The method comprises the following steps: step 1, scanning a compressor crankshaft in a non-contact manner by adopting a three-coordinate motion platform carrying a line laser contourgraph to obtain an original three-dimensional point cloud; 2, carrying out the preprocessing of the original three-dimensional point cloud through employing adaptive radius filtering and minimum point constraint voxel filtering; step 3, realizing pin hole position degree detection based on an improved RANSAC algorithm and two-dimensional boundary clustering, and fitting an end surface excircle and a pin hole circle to obtain the pin hole position degree; and step 4, realizing pin-end face perpendicularity detection through coarse registration and weighted ICP fine registration. The method is used for detecting the 3D morphology of the crankshaft.

The invention discloses an automobile engine which comprises an engine body, a crankshaft and an air conditioner generator. The air conditioner generator comprises a stator and a rotor and is placed on the front portion of the automobile engine and driven by the crankshaft of the automobile engine, and the axis of the stator of the air conditioner generator is coaxial to the axis of a main shaft neck of the crankshaft of the automobile engine. The automobile engine can supply power to vehicle-mounted air conditioner systems, and the air conditioner generator is arranged at the front end of the crankshaft of the automobile engine. The automobile engine requires no belt for driving and is simple in structure and convenient for the vehicle-mounted air conditioner system to adopt the whole distribution structure.

The utility model relates to the technical field of electrical switches, in particular to an opening and closing device of a pole-mounted switch, which comprises a shell, a sliding rod, a crankshaft and a connecting rod. The linkage control device further comprises a driving mechanism, and the driving mechanism can drive the crankshaft to swing in a limited mode so as to drive the sliding rod to be switched between the upper limit position and the lower limit position, so that the pole columns are switched between the closed state and the separated state, and the linkage control device has the advantages that linkage control over the multiple pole columns is achieved through a mechanical structure based on the crank connecting rod principle; and the reliability and the convenience of opening and closing control of the pole are greatly improved. Due to the fact that linkage control is achieved, it can be guaranteed that the pole columns can be switched to the needed working state at the same time, and the use reliability and the on-off accuracy of the pole column module are greatly improved.

The compressor comprises a shell, a pump body assembly and a motor, the pump body assembly is arranged in the shell, a stator assembly of the motor is fixedly connected with the inner wall of the circumferential shell, and a rotor assembly of the motor is located in an annular space of the stator assembly and connected with a crankshaft. The oil baffle cap is located at the uppermost end of the rotor assembly and can conduct oil-gas separation on mixed gas from the pump body assembly. The height of the flanging structure of the oil baffle cap is h, the height between the upper end face of the circumferential shell and the upper end face of the stator core in the vertical direction is the height H of an upper cavity of the shell, and the nominal working volume of the compressor is V. According to the compressor, the value of H * h / V is reasonably set to be within the range of (0.97-3.53) * 10 <-2 > mm <-1 >, the flowing resistance of airflow and the separation efficiency of lubricating oil can be balanced, and the working efficiency of the compressor is improved. Therefore, the operation performance and reliability of the compressor are improved, meanwhile, the situation that the size of the compressor is too large is avoided, and the compact design of the compressor structure is facilitated.

The invention provides a ribbon loom driven by horizontally opposed crankshafts, which comprises a base rack provided with a crankcase, a crankshaft driving assembly is arranged in the crankcase and drives a heald frame opening mechanism through a connecting rod, and a cloth tape winding mechanism, a weaving mechanism and a weft yarn feeding mechanism are further arranged above the crankcase. The crankshaft driving assembly comprises a rear crankshaft set and a front crankshaft set which are horizontally and oppositely arranged, a first synchronous wheel and a second synchronous wheel in the rear crankshaft set are connected through a rear main shaft piece, and a driving belt wheel is installed on a motor piece and connected with the first synchronous wheel through a first synchronous belt. The front crankshaft set and the rear crankshaft set are driven to rotate synchronously, all heald frame openings in the heald frame opening mechanism operate synchronously according to the preset opening rhythm, openings are formed through the heald frame set, the openings reach the weaving mechanism to be woven into cloth belts, and then the cloth belts are wound into a container through the winding mechanism. The vibration and noise of the machine are reduced, and the overall processing efficiency of the ribbon loom is improved.

The reciprocating compressor comprises a compressor frame, a crankshaft and a connecting rod, connecting the crankshaft to a crosshead. A piston rod connects a piston to the crosshead. The piston reciprocates in a gas compression cylinder. At least one pressure-drop module is positioned between the gas compression cylinder and a crosspiece guide. The piston rod extends from the gas compression cylinder through a pressure-drop chamber of the pressure-drop module. Also disclosed herein is a method of operating a reciprocating compressor.

The invention discloses an internal combustion engine crankshaft quenching finish machining process optimization control system, which comprises a multi-source process data acquisition module used for acquiring multi-source process data and generating a standardized input sample set; the Prophet model building module is used for building an improved Prophet model and outputting a predicted value, a predicted residual error and a confidence interval; the black swan optimization module is used for performing global optimization on the model and updating model parameters; the prediction execution module is used for generating a dynamic change trend of quenching current, scanning speed and cooling flow; the multi-target constraint solving module is used for determining an optimal control parameter combination; and the self-adaptive control module is used for applying the optimal control parameter combination to an actual process and executing adjustment according to a time rolling period. By fusing the improved Prophet model and the black swan optimization algorithm, intelligent prediction, parameter optimization and self-adaptive control in the quenching finish machining process of the crankshaft of the internal combustion engine are achieved.

The invention provides a fluid machine with a bearing and heat exchange equipment. The fluid machine with the bearing comprises a crankshaft, a cylinder sleeve, the bearing, a cross groove structure and a sliding block, and the crankshaft is provided with two eccentric parts; the crankshaft and the cylinder sleeve are eccentrically arranged and the eccentric distance is fixed; the at least one bearing is arranged on the axial end surface of the cylinder sleeve and is positioned on the outer side of the cylinder sleeve; the cross groove structure is rotatably arranged in the cylinder sleeve, the axial part of the outer circumferential surface of the cross groove structure is attached to an inner ring of the bearing, two limiting channels of the cross groove structure are sequentially arranged in the axial direction of the crankshaft, and the extending direction of the limiting channels is perpendicular to the axial direction of the crankshaft; the sliding blocks are provided with through holes, the two eccentric parts correspondingly stretch into the two through holes of the two sliding blocks, and the two sliding blocks are correspondingly arranged in the two limiting channels in a sliding mode and form a variable volume cavity. The problems that in the prior art, a compressor is low in energy efficiency and large in noise are solved.

The invention belongs to the technical field of defect detection, and particularly relates to a forging part surface defect detection device which comprises a base, a controller is connected to the side wall of the base, a moving assembly is arranged in the base, and crankshafts are clamped by the moving end of the moving assembly and the surface of the base through clamping assemblies. The upper side wall of the base is fixedly connected with a mounting frame. When the surface defects of the crankshaft are detected, the surfaces of a journal, a crank arm and a balance block are synchronously detected in different areas, the device is adaptive to crankshafts of different models, detection blind areas caused by a complex structure can be greatly eliminated, and it is ensured that the defects such as microcracks and scratches of all key parts are not missed; meanwhile, the detection efficiency can be remarkably improved, and time loss caused by single-region successive detection is avoided; and the debugging period of tool clamps and parameters during detection of crankshafts of different models can be shortened, the equipment investment and the production cost are reduced, and the universality and the flexibility of the detection system are enhanced.

A diesel engine crankshaft residual stress and deformation relation prediction method belongs to the technical field of internal combustion engine key component manufacturing. The method comprises the steps of dynamically correcting a finite element model through multi-stage measured data, performing high-precision reconstruction of a crankshaft residual stress field, establishing a quantitative relation between stress distribution and deformation, and combining numerical simulation and response surface method optimization to realize high-precision residual stress distribution prediction. And further analyzing the release and redistribution rules of the residual stress in the material removal process. Residual stress distribution is actively controlled to prolong fatigue life, and stable production of high-precision and long-life crankshafts is ensured. The grinding feeding rate is reduced through active control over residual stress in the grinding process so that the tensile stress peak value in the layer depth direction can be reduced, and meanwhile it is guaranteed that the surface roughness is within a proper interval. A gradient cooling strategy is adopted, the cooling liquid flow is increased in the initial grinding stage, and surface layer thermal stress accumulation is restrained. And the grinding wheel linear speed is controlled, and grinding efficiency and residual stress inhibition requirements are balanced.

This technology provides an advantage in reducing manufacturing costs when incorporating pin bodies into eccentric oscillating gear systems. [Solution] The system comprises a crankshaft 14 having an eccentric portion 12, a rocking member 16 that is rocked by the eccentric portion 12, an external gear group 18 that rocks together with the rocking member 16, an internal gear 20 that meshes with the external gear group 18, a first lateral member 22 positioned on one axial side with respect to the rocking member 16, and a pin body 46 that synchronizes the rotational component of the rocking member 16 with the first lateral member 22, with contact being made with a first recess 50 provided in the rocking member 16 and a second recess 52 provided in the first lateral member 22, respectively, wherein the pin body 46 is rotatably provided inside the first recess 50 and the second recess 52, respectively.

The invention provides a diesel engine cylinder fault diagnosis method and system based on MMFE-PSO-KELM, and the method comprises the steps: S1, collecting a vibration signal of the surface of a cylinder cover of a diesel engine cylinder and a rotating speed signal of a crankshaft, and carrying out the preprocessing of the vibration signal; s2, an MMFE algorithm is adopted to analyze and process the preprocessed vibration signals, and MMFE feature vectors rich in high-frequency and low-frequency fault mode information are constructed; s3, optimizing a regularization parameter C and a kernel function parameter sigma of the KELM model by using a PSO (Particle Swarm Optimization) algorithm, and searching an optimal parameter combination which maximizes the classification accuracy by taking the classification accuracy as a fitness function; and S4, constructing a KELM diagnosis model based on the optimal parameter combination, and performing fault diagnosis on the diesel engine cylinder by taking the high-frequency and low-frequency fault mode information extracted by the MMFE algorithm as input. According to the method, strong noise interference can be effectively inhibited, fault feature information can be comprehensively reserved, KELM key parameters can be optimized, and the accuracy and reliability of fault diagnosis of the diesel engine cylinder are improved.

An outdoor power tool and methods of operating outdoor power tools are provided. An outdoor power tool includes a first blade extending from a first end to a second end, a second blade extending from the first end to the second end, a first connecting rod coupled to the first blade at the first end and comprising a first length, a second connecting rod coupled to the second blade at the first end and comprising a second length different from the first length, and a crankshaft coupled to the first connecting rod and the second connecting rod. The crankshaft is configured for transmitting reciprocating motion to the first blade, the second blade, or both the first blade and the second blade in a first direction and a second direction. The second direction is opposite the first direction.

The application provides a cast power end frame including a pair of end plates and an outer casing extending between the end plates and defining an interior therein; a crank shaft housing extending between the end plates and within the interior of the outer casing, and a plurality of crosshead tubes, each crosshead tube extending substantially perpendicular to the crank shaft housing, wherein the outer casing, crank shaft housing, and crosshead tubes are cast as a single part comprising steel comprising a carbon constituent of 0.06%-1.99% carbon.

An embroidery machine head with a controllable take-up track comprises a needle bar frame connected with the embroidery machine head, an embroidery needle bar and a take-up bar are installed on the needle bar frame, the embroidery needle bar moves up and down and is controlled by a cam driving device driven by a main shaft, the take-up bar is connected with take-up teeth in an attached mode to form a take-up assembly, and the take-up assembly is connected with an installation shaft of the needle bar frame. The take-up-lever and the take-up-tooth rotate synchronously, the side edge of the take-up-tooth is rotationally connected with a rolling bearing through an arc-shaped clamping groove, a connecting shaft in the middle of the rolling bearing is connected with a first connecting rod, and the first connecting rod is connected with a linear shaft driven by an independent motor. According to the utility model, the linear shaft driven by the independent motor is used for changing a traditional crankshaft or cam control change take-up track structure, and the take-up track is controlled by combining the up-and-down movement of the needle bar of the embroidery machine with the take-up lever driven by the linear shaft, so that the take-up track is adjustable.

The invention provides a control method and device for consistency of all cylinders of an engine and a vehicle. The method comprises the steps that the rotating speed and torque of the engine are obtained, and the rotating speed and torque of the engine are obtained; determining that the engine is in a low-speed and low-load working condition under the condition that the engine rotating speed is in a first preset range and the engine torque is in a second preset range; under the condition that the engine is in the low-speed and low-load working condition, the camshaft phase is controlled to be delayed relative to the crankshaft phase, so that opening of an intake valve of the engine is delayed, and the problem that in the prior art, the actual EGR rate consistency of all cylinders of the engine is poor is solved.

The invention relates to the technical field of crankshaft machining, and provides a crankshaft finish machining tool which comprises a crankshaft conveying mechanism and a crankshaft grinding mechanism, the crankshaft grinding mechanism comprises a crankshaft clamping assembly and a follow-up feeding assembly which are installed on a lathe bed, and the crankshaft clamping assembly is used for clamping a crankshaft and driving the crankshaft to rotate; the follow-up feeding assembly is used for driving the grinding wheel frame to feed and driving the grinding wheel to rotate; a waste liquid cleaning and collecting assembly is installed on the grinding wheel frame and comprises a collecting frame, the inner wall of the collecting frame is rotationally connected with a flow guide cleaning scraper, the flow guide cleaning scraper is connected with the inner wall of the collecting frame through a pressing elastic piece, and the bottom of the collecting frame is connected with a recycling pipe and provided with a plurality of recycling holes. The collecting frame is communicated with a recycling pipe through a recycling hole, and the recycling pipe is communicated with a cooling liquid supply box in the follow-up feeding assembly. By means of the waste liquid cleaning and collecting assembly, online automatic collection, flow guiding, filtering separation and cyclic utilization of grinding waste liquid and waste chips are achieved.

The utility model discloses a bearing, compressor and refrigeration equipment, and relates to the technical field of compressors, the inner wall of the bearing is provided with a plurality of first oil grooves and a plurality of second oil grooves, the plurality of first oil grooves all penetrate through one end face of the bearing, the plurality of second oil grooves all penetrate through the other end face of the bearing, and in the rotation stroke of a crankshaft, the first oil grooves are communicated with the second oil grooves. A communicating groove in a crankshaft of the compressor is provided with a first position communicating with the multiple first oil grooves and a second position communicating with the multiple second oil grooves. The first oil grooves are evenly distributed in the circumferential direction of the bearing, the second oil grooves are evenly distributed in the circumferential direction of the bearing, no matter where the crankshaft is located, lubricating oil can smoothly enter the first oil grooves and the second oil grooves at the same time, and force acting on the bearing is the same in the circumferential direction; instantaneous pressure unbalance is avoided, and therefore excitation to the bearing is reduced.

A portable fence reel has a reel spool, and a frame including at least one arm, where the reel spool is rotatably mounted to the at least one arm. The fence reel also has a crank shaft, where rotation of a crank shaft results in rotation of the reel spool, and a winding handle. An automatic engaging mechanism includes a coupler rotationally fixed to the crank shaft, and a clutch portion configured to be driven by the winding handle and, in use, move along a longitudinal axis of the crank shaft to engage or disengage with the coupler.

A glider seating unit with a selectively powered gliding motion is provided. The glider seating unit includes a base frame and a glide assembly movably connected to the base frame. The glide assembly is configured to glide in a forward direction and in a backward direction relative to the base frame. A glider drive mechanism is connected to the base frame and includes a motor, a drive shaft connected to the motor, a crankshaft releasably connected to the drive shaft at a joint, and a linkage connected between the crankshaft and the glide assembly. Operation of the motor in a first rotational direction connects the drive shaft to the crankshaft to rotate the crankshaft to thereby induce reciprocating forward and backward gliding motion of the glide assembly relative to the base frame. Operation of the motor of the glider drive mechanism in an opposite, second rotational direction disconnects the drive shaft from the crankshaft to permit the glide assembly to glide freely forward and backward relative to the base.

The utility model discloses a crankshaft, compressor and refrigeration equipment relates to compressor technical field, wherein crankshaft comprises eccentric part and two shaft section respectively arranged on the eccentric part both sides, at least one shaft section is provided with a plurality of communication groove, the inner wall of the bearing of compressor is provided with first oil groove and second oil groove that extend along the axial direction of bearing, in the rotating stroke of the crankshaft, the communicating grooves are provided with first positions communicating with the first oil grooves in the corresponding bearings and second positions communicating with the second oil grooves. The multiple communicating grooves are evenly distributed in the circumferential direction of the shaft section at intervals, no matter where the crankshaft is located, lubricating oil can smoothly enter the multiple communicating grooves at the same time, force acting on the shaft section is the same in the circumferential direction, instantaneous pressure unbalance is avoided, and excitation to the crankshaft is reduced.

An internal combustion engine for a vehicle includes: a crankshaft; a balancer shaft that is connected to the crankshaft and is rotated by rotational power transmitted from the crankshaft; a crankcase including a crank chamber that accommodates the crankshaft and the balancer shaft; and a filler that fills a space around the balancer shaft in the crank chamber and is a member different from a wall surrounding the crank chamber.

The invention provides a method for determining a crankshaft reference phase of a reciprocating machine and a diagnosis method, device and system, and the method comprises the steps: collecting vibration signals of a plurality of measurement points of the reciprocating machine, and the measurement points at least comprise an air inlet valve and an exhaust valve of the reciprocating machine; taking the offset of the current period as a starting point, and intercepting an air inlet valve waveform and an exhaust valve waveform corresponding to a complete crankshaft rotation period from the vibration signal; respectively determining an air inlet valve actual measurement phase and an exhaust valve actual measurement phase according to the air inlet valve waveform and the exhaust valve waveform; calculating an air inlet deviation between the actually measured phase of the air inlet valve and a preset phase of the air inlet valve, calculating an exhaust deviation between the actually measured phase of the exhaust valve and the preset phase of the exhaust valve, calculating a phase deviation according to the air inlet deviation and the exhaust deviation, and updating an offset according to the phase deviation; and taking the updated offset as a starting point to repeat the process until the phase deviation is smaller than a preset threshold value, and taking the offset when the phase deviation is smaller than the preset threshold value as the crankshaft reference phase. According to the invention, the crankshaft reference phase can be obtained.

The invention relates to the field of air compressors, in particular to a vehicle-mounted two-stage compression air compressor structure. The air compressor comprises an air compressor body, a motor, an oil groove and two lubricating mechanisms. The air compressor body comprises a shell, a cylinder arranged at the top of the shell and provided with two sliding ways distributed side by side, two piston barrels arranged in the two sliding ways in a sliding mode respectively, mounting shafts arranged in the piston barrels, a crankshaft rotationally arranged on the shell and a piston rod with the two ends rotationally connected with the crankshaft and the mounting shafts respectively. The motor is arranged on one transverse side of the air compressor body. An output shaft is connected with the crankshaft through a coupler. The oil groove is formed in the shell; the lubricating mechanism comprises an oil spraying pipe arranged on the piston barrel, an oil conveying pipe communicated with the oil spraying pipe, an oil bailing piece used for bailing oil from the oil groove and a linkage assembly in transmission connection with the piston rod and the oil bailing piece, and a plurality of liquid spraying holes are evenly distributed in the periphery of the piston barrel. Lubricating oil can be evenly sprayed to the inner wall of the cylinder body channel for lubrication, and the self-lubricating effect is good.

A sliding arrangement for use in an internal combustion engine is described, comprising a cylinder liner (1) and at least one piston ring (10), wherein the liner (1) has a through-bore defining an inner surface (S) which in turn defines three sections: a first section (2) near the end of the piston stroke, facing the cylinder head (at top dead center, TDC); a second, middle section (3); and a third section (4) near the end of the piston stroke, facing the crankshaft of the engine (at top dead center, TDC), wherein (i) the TDC section (2) of the liner (1) has a surface finish with a first roughness value defined by a structure of recesses and projections (“valleys” and “raised areas”); the middle section (3) of the liner (1) has a surface finish with a second roughness value defined by a structure of recesses and projections (“valleys” and “raised areas”);(1) the BDC section (4) of the cylinder liner (1) has a surface finish with a third roughness value defined by a structure of recesses and projections (“valleys” and “raised areas”), and the roughness value of the middle section (3) is significantly lower than the roughness value of the TDC section (2), and is defined by an essentially very smooth structure of recesses and projections (“valleys” and “raised areas”); and (ii) a ceramic coating (R) is applied to at least part of the contact surface of the piston ring (10) by the physical vapor deposition (PVD) process.

A motorcycle (1000) comprises an engine (100), a frame (200), a walking system (300) and a suspension system (400), the engine (100) comprises a crankshaft (21), a balance shaft (22), an output gear (23), a balance gear (24), a main shaft (31), an auxiliary shaft (32), multiple sets of variable-speed driving gears (33) and multiple sets of variable-speed driven gears (34), and the output gear (23) is in meshing transmission with the balance gear (24) so as to drive the balance shaft (22) to rotate; a first plane (101) is determined by the axis of the main shaft (31) and the axis of the crankshaft (21), a second plane (102) is determined by the axis of the main shaft (31) and the axis of the auxiliary shaft (21), and an included angle theta of 0 degree lt is formed between the first plane (101) and the second plane (102); theta < lt >; and 180 degrees.

The invention discloses punching equipment for crankshaft production, and relates to the field of punching equipment, the punching equipment comprises a machining table, a chip removal box and two electric control clamps are mounted on the machining table, two crankshaft charge bars are placed on the machining table, and the electric control clamps are used for clamping the crankshaft charge bars. It needs to be explained that in the punching process of the crankshaft charge bar, when the electric control clamp clamps the crankshaft charge bar in place, holes in the lifting isolation plate and the buffering isolation plate are aligned with the crankshaft charge bar, the clamping stability of the electric control clamp is guaranteed, and if a drill rod is excessively abraded or fractured, the buffering isolation plate stops moving upwards, and therefore the crankshaft charge bar is punched. Meanwhile, an emergency stop switch is triggered, so that the motor is suddenly stopped, the punching work is paused, and the problem of insufficient punching depth is avoided; in addition, in the moving process of the sliding drill floor, the cleaning integrated frame drives the cleaning sleeve to clean the drill rod, scrap iron is prevented from being wound or attached to the drill rod, cleanliness of the drill rod is guaranteed, and then the punching quality is guaranteed.

The invention discloses a compressor multi-working-condition feature extraction method based on valve movement acoustic emission, and belongs to the technical field of compressors, and the method comprises the following steps: S1, synchronously collecting compressor valve acoustic emission signals and piston displacement data by using an acoustic emission sensor and a rotating speed encoder, and constructing a time alignment joint signal sequence; s2, calculating a real-time phase according to a piston displacement crankshaft angle, enveloping an energy change rate by combining an acoustic emission signal, and dividing four stages of a compression cycle; s3, extracting the multi-dimensional time-frequency characteristics of the acoustic emission signals in each stage; and S4, inputting the multi-dimensional features into a pre-training auto-encoder, and generating low-dimensional fusion feature vectors to represent operation features. According to the compressor multi-working-condition feature extraction method based on valve movement acoustic emission, acoustic emission and displacement combined modeling is adopted to improve the working condition sensing precision, multi-dimensional features are extracted by means of wavelet packet transformation and spectral analysis fusion to strengthen micro working condition recognition, and the method adapts to multiple typical working conditions and is good in robustness and adaptability.