247 results about "Gas engine" patented technology

The invention belongs to the related technical field of pressure tests, and particularly discloses a gas inlet pipeline test device for a gas generator, which comprises a first base and a second base, a round frame is fixedly mounted on one side of the upper end surface of the first base, an annular pipe is embedded in the round frame, and a connecting rod is mounted at one end in the annular pipe through an arranged telescopic mechanism. The outer side of the connecting rod is externally connected with a ring rod through an inner chuck fixedly connected in a sleeving mode, a sealing rotating ring is arranged on the outer wall of one side of the round frame, a test air inlet pipe movably penetrates through the sealing rotating ring in a penetrating mode, and a particle feeding simulation mechanism is arranged at the end, away from the sealing rotating ring, of the test air inlet pipe. By simulating multi-field coupling environments such as pressure fluctuation, particle scouring and mechanical vibration under real working conditions, the problem that data deviation is large due to the fact that complex working conditions cannot be reproduced in a traditional test is solved, and precise detection and full-life-cycle evaluation of the performance such as wear resistance, pressure resistance and blockage resistance of the pipeline are achieved.

The invention relates to the technical field of gas engines, and particularly discloses an anti-deformation and high-cooling-efficiency backflow combustion chamber large elbow, the sections of a first layer wall and a second layer wall of the large elbow are arc-shaped, the first layer wall is arranged outside the second layer wall, one end of the first layer wall and one end of the second layer wall are fixedly connected into a whole, and the other end of the first layer wall is arranged outside the second layer wall. The other end of the first layer wall and the other end of the second layer wall are clamped, a space capable of moving relative to each other is formed in the clamping position, a plurality of annular grooves facing the second layer wall are formed in the first layer wall, the annular grooves are attached to the side, facing the first layer wall, of the second layer wall, and a cavity between the first layer wall and the second layer wall is divided into a plurality of impact diffusion cavities through the annular grooves. According to the invention, the gap between the double walls is not changed, the problem of deformation caused by stress due to inconsistent swell capacity of the double walls is prevented, the cooling protection effect of the inner wall is enhanced, cracks caused by too high temperature of the large elbow are prevented, the overall stress is small, cracks are not easy to appear at welding joints, tight connection is realized, and air leakage is not easy.

The invention discloses a heating control method for an engine gas delivery pipeline of a marine gas generator set, which relates to the technical field of marine gas power systems, and comprises the following steps: collecting multi-dimensional environment state information of the gas delivery pipeline in real time, analyzing gas components and pressure fluctuation data, and calculating the temperature of the gas delivery pipeline; a theoretical dew point temperature and a potential paraffin precipitation temperature under real-time pressure are calculated by combining a fuel gas physical property database, a real-time heat exchange model is constructed by combining a pipeline outer wall temperature gradient and a cabin environment temperature, theoretical temperature attenuation curves of different positions of fuel gas in a pipeline are obtained, condensation and paraffin precipitation risk positions and degrees are predicted after comparison, and a real-time heat exchange model is established. And differential electric heat tracing control strategies of different sections of the pipeline are generated in combination with relative humidity data of the cabin. The method can adapt to the real-time physical property of gas and the heat exchange state of the pipeline section, and the heating control execution mode of the gas pipeline is optimized.

The invention discloses a gas engine cold start difficulty diagnosis method, system and device and a readable storage medium, and relates to the field of cold start fault detection, and the method specifically comprises the steps: determining an initial idle speed segment based on a real-time vehicle speed, a real-time engine rotation speed, a neutral gear signal and a clutch signal when the lowest environment temperature is detected to be smaller than a preset environment temperature threshold value; the initial idling segment is a working state when the vehicle is static and an engine is in an idling mode; in the initial idle speed segment, based on the maximum value of the engine rotating speed, the real-time engine rotating speed, the real-time gas rail pressure, the real-time gas rail temperature, the engine water temperature at the starting point of the initial idle speed segment, the real-time accelerator opening degree and the fault code, the cold start difficulty result of the gas engine is determined; the fault code is a corresponding fault code when the pressure of the intake manifold is smaller than a preset pressure threshold value of the intake manifold. According to the invention, specific faults of cold start difficulty can be identified efficiently and accurately.

The present application relates to the technical field of engine, and discloses a combustion system, a gas engine and a combustion system design method, a second fuel injection hole sprays an oil jet to ignite a part of natural gas jets on the same side of the second fuel injection hole, and under the action of a vortex in a combustion chamber, with the second fuel injection hole continuously spraying the oil jet, a flame formed by the oil jet igniting the natural gas jets gradually becomes longer along the vortex direction, so that the oil jet sprayed by the second fuel injection hole ignites the natural gas jets on the side of the natural gas injector opposite to the fuel injector; the oil jet sprayed by the first fuel injection hole ignites the remaining natural gas jets, so that the oil jets sprayed by the fuel injector on both sides of a reference line can achieve the maximum ignition effect, all the natural gas jets are ignited by using the least oil jet, the ignition effect of igniting the natural gas by using the fuel is improved, the thermal efficiency is higher, and the emission is lower.

The invention provides a gas engine lubricating oil composition and a preparation method thereof. The gas engine lubricating oil composition of the present invention comprises: (A) an alkyl phosphate compound; (B) alkylated diphenylamine; (C) a polyisobutylene succinic acid pentaerythritol ester dispersing agent; (D) a salicylate and / or sulfonate; (E) zinc dialkyl dithiophosphate; (F) an oil-soluble organic molybdenum friction modifier; (G) a metal corrosion inhibitor; (H) a pour point depressant; (I) a major amount of a lubricating base oil. The gas engine lubricating oil composition disclosed by the invention has excellent high-temperature oxidation resistance, cleaning performance, extreme pressure anti-wear performance and anti-corrosion performance.

The application belongs to the technical field of lubricating oil, and specifically provides a gas engine lubricating oil and a preparation method thereof.The gas engine lubricating oil comprises the following raw materials: ester base oil, anti-wear agent, dispersant, pour point depressant and antifoaming agent, wherein the ester base oil is prepared by esterification reaction of polyhydric alcohol and fatty acid; the preparation method of the anti-wear agent comprises the following steps: first, reacting acrylic acid with vinyl imidazole to prepare a modifier; then, polymeric phenol is obtained by polymerization of phenol under the action of a catalyst; finally, the polymeric phenol, boric acid and vegetable oil are reacted, the modifier is added after a certain time of reaction, and the reaction is continued to obtain the anti-wear agent.The preparation method of the gas engine lubricating oil of the application is that the raw material components are uniformly mixed according to the formula, and the gas engine lubricating oil of the application has good wear resistance, oxidation resistance, high-temperature detergency and thermal stability.

The application discloses a kind of single-shaft combustion engine natural gas filter filter core cleaning device, it is related to filter core cleaning technical field, including support seat and top frame, first runner and cleaning assembly are rotatably installed on the support seat, drum is installed on first runner, support assembly is arranged below first runner, cleaning pipe is installed above the drum, spray hole is opened in cleaning pipe, drive assembly is installed on the top frame, first magnetic block is connected below drive assembly, copper pipe is arranged on the outside of first magnetic block, second magnetic block and support ring are respectively arranged on the upper and lower sides of copper pipe, third magnetic block is fixedly connected on the inner wall of support ring, third motor is installed on support ring, first docking block is connected on the output shaft of third motor.The application solves the problem that the existing filter core cleaning device cannot automatically activate the vibration structure to vibrate the filter core to improve the cleaning effect during cleaning, and cannot reduce the transmission of ineffective vibration energy during cleaning.

Disclosed herein is a work machine having a gas engine and a gas storage system having at least one gas storage tank. The controller is provided with a controller configured to determine a leakage condition within the gas storage system and / or the gas engine.

The invention relates to the technical field of hoisting equipment control, in particular to a double-beam crane control device for a lifting gas engine unit of a power plant, which comprises the following modules: a load stabilizing module for monitoring the tension difference and the swing amplitude of a hoisting cable in real time and starting an automatic adjusting function when the tension difference and the swing amplitude exceed a set threshold value; the path planning module is used for generating a hoisting path according to the weight and the size of the gas engine unit and adjusting the path when an obstacle or working condition change is detected; the dynamic balance module is used for monitoring the vertical offset and the vibration condition of the gas engine unit, and the alarm prompting module is used for sending out an acousto-optic warning signal when an abnormal condition occurs in the hoisting process; according to the method, intelligent feedback control, self-adaptive path planning and high-precision positioning technologies are introduced, so that the defects in the aspects of load stability, dynamic balance control and complex working condition adaptability in the prior art are overcome, and the safety and high efficiency of the gas engine unit in the hoisting process are ensured.

The utility model is suitable for internal combustion engine gas supply mechanism technical field provides a kind of multi-point injection air intake pipe of gas machine, comprising: main pipeline, its one side is equipped with air inlet, the other side of main pipeline is equipped with several air intake manifold, each air intake manifold is equipped with air jet nozzle, the flow direction of the gas in the inside of air jet nozzle and air intake manifold has certain angle, air intake manifold and main pipeline use integrated structure, by this, the utility model is guaranteed by setting integrated air intake structure, the reliability of air intake, while setting a kind of separate air jet structure, to ensure the separate control to engine, optimization control effect.

To provide a gas engine capable of supplying a large volume of hydrogen to a combustion chamber and suppressing increase in manufacturing cost.SOLUTION: A gas engine that burns fuel gas including hydrogen in a combustion chamber includes: an intake line in which an intake flow passage is formed, the intake flow passage including an intake port opened in the combustion chamber; a fuel supply line provided separately from the intake line, the fuel supply line having a fuel flow passage in which fuel gas flows toward the combustion chamber and an outlet of the fuel flow passage opened in the combustion chamber; a solenoid valve provided in the fuel supply line to open / close the fuel flow passage; and a check valve provided on the combustion chamber side in the fuel supply line of the solenoid valve to open / close the fuel flow passage by using differential pressure between the fuel flow passage and the combustion chamber.SELECTED DRAWING: Figure 1

The utility model provides a high temperature resistant gas engine valve seat ring, which relates to the technical field of valve seat rings, and comprises a gas engine body, the top of the gas engine body is provided with a valve opening, a seat ring body is embedded in the valve opening, and the surface of the seat ring body is sequentially sleeved with a wear-resistant layer and a high temperature resistant layer from outside to inside. An L-shaped groove is formed in the side, close to the valve opening, of the top of the gas engine body, and an L-shaped plate is embedded into the L-shaped groove. The wear-resistant layer and the high-temperature-resistant layer are sequentially arranged on the surface of the seat ring body from outside to inside, so that the wear-resistant and high-temperature-resistant performance of the seat ring body can be improved, the service life of the seat ring body can be prolonged, and when the seat ring body needs to be detached, the seat ring body can be detached by pushing the L-shaped plates to move, so that the service life of the seat ring body is prolonged. At the moment, an arc groove in one end of the L-shaped plate can extrude the bevel edge of the edge of the seat ring body, the effect of conveniently taking out the seat ring body can be achieved, and therefore the effect of conveniently replacing the seat ring body can be achieved.

The utility model relates to a multi-sparking plug ignition system, combustion chamber and gas engine, multi-sparking plug ignition system includes precombustion chamber and second sparking plug, precombustion chamber is provided in dome structure center, precombustion chamber is provided with first sparking plug, precombustion chamber is provided with a plurality of jet orifice at interval along the circumference, second sparking plug is provided with second sparking plug. At least one spray hole points to a high-frequency detonation area near an exhaust throat of an exhaust passage in the combustion chamber, the second spark plug and the pre-combustion chamber are arranged between the air inlet passage and the exhaust passage in a spaced mode, and the second spark plug is close to the edge of the dome structure. The high-speed jet jetted by the pre-combustion chamber in the multi-spark-plug ignition system enables flame to reach the edge of the combustion chamber as soon as possible, and the second spark plug can accelerate combustion in the nearby space, so that the multi-spark-plug ignition system can effectively improve the flame propagation speed, shorten the time for the flame to propagate to the edge of the combustion chamber and improve the combustion efficiency. Flame can reach the edge of a combustion chamber of an engine as soon as possible, and the aim of reducing the knocking tendency is achieved.

Disclosed is a method of controlling fuel injection in a fuel gas powered internal combustion engine. Injection events are performed by applying a drive signal to a fuel injector. The drive signal has a profile including a first phase, wherein a first voltage, boost voltage V1, is applied to the fuel injector to regulate a drive current at a first level, opening current I1, during a first period T1; a second phase, wherein the current is decreased to second level I2, about zero, during a time period T2 in order to decelerate the valve member in its opening stroke; a third phase, wherein a third voltage V3 is applied to the fuel injector to regulate a drive current at a third level I3 during a third period T3, the third phase being configured to deliver sufficient energy to open and stabilize the valve member in its open position, preventing bounce of the injector needle on reaching opening; a fourth phase, wherein a fourth voltage, battery voltage V4, is applied to the fuel injector to regulate a drive current at a fourth level, hold current I4, during a fourth period T4. The method allows gaseous fuel injection of a direct injection gas engine by controlling a solenoid injection valve so that the valve does not bounce on reaching the fully open position. A gaseous fuel delivery system using the method is also disclosed.

The utility model provides a gas machine post-treatment noise elimination structure, which comprises a post-treatment part and a noise elimination part, the noise elimination part comprises a bent pipe, an exhaust pipe, an exhaust pipe and an exhaust pipe, one end of the high-frequency pipe is connected to the other end of the bent pipe, and a plurality of fine holes are uniformly distributed in the middle section of the high-frequency pipe; the first barrel and the high-frequency tube are coaxially arranged, the two ends of the first barrel are closed, so that a resonant cavity is formed between the first barrel and the high-frequency tube, and the middle section of the high-frequency tube is hidden in the resonant cavity; the resonant tube is located in the resonant cavity, and one end of the resonant tube is connected with the surface of the high-frequency tube; the silencing cotton wraps the middle section of the high-frequency pipe and covers the fine holes; a Helmholtz resonant cavity structure is additionally arranged, so that the low and medium frequency noise elimination amount is increased; a high-frequency tube is added to suppress high-frequency noise.

The invention discloses a load translation control method for a hybrid diesel locomotive considering a diesel engine and a gas engine. The method comprises the following steps: in a ground bench test, respectively simulating typical operation conditions of the diesel / gas engine, and determining respective safe power fluctuation intervals; in the running process of the hybrid diesel locomotive, the output power of the diesel / gas engine is dynamically corrected based on the power fluctuation threshold value of the running data; and scene-based multi-energy load translation control is carried out, the scene comprises the dynamic operation characteristics of acceleration and deceleration of the train, and the engine power of the hybrid diesel locomotive is adjusted according to the working mode of the power battery and the power fluctuation difference value, so that the load translation of the hybrid diesel locomotive is met based on the engine power. According to the method, multi-energy cooperative control considering load translation, scientific and controllable threshold value and working condition adaptation is achieved, the comprehensive traction force of the hybrid diesel locomotive is improved, and energy conservation and emission reduction are achieved.

The invention discloses a methane gas engine gas supply system and a using method, and belongs to the technical field of engines, the system comprises an air filter, an air valve, a mixer and a supercharger which are sequentially connected in series through a pipeline; the outlet end of the supercharger is connected with an air inlet of the engine; the fuel gas concentration sensor is arranged on the fuel gas supply pipeline; the fuel gas supply pipeline is connected with the mixer through a plurality of fuel gas branch pipelines, and each fuel gas branch pipeline is provided with one fuel gas valve; and the controller is in circuit connection with the gas concentration sensor, the air valve and the gas valve. The device can adapt to the gas concentration change range of 8%-100%. Meanwhile, the controller can correct the opening degree of the gas valve and the opening degree of the air valve in real time, so that closed-loop control is achieved, and reliable operation of the gas engine is achieved.

This invention discloses an exhaust device suitable for pure hydrogen gas engines, relating to the technical field of exhaust treatment for pure hydrogen gas engines. It solves the problem that existing pure hydrogen gas engine exhaust treatment devices suffer from the inability of a single condensation dehydration technology to completely eliminate whitening, and the inability of a single whitening device to remove water. A multi-stage condensation structure is installed inside the flange pipe at the uppermost end of the exhaust pipeline. The multi-stage condensation structure and the inner wall of the flange pipe form a condensation chamber. A condensation channel is provided within the multi-stage condensation structure. A return water connector and a water inlet connector are provided on the flange pipe. The water inlet connector is connected to the lower water inlet of the condensation channel; the return water connector is connected to the upper water return port of the condensation channel. By setting up a multi-stage condensation dehydration device in the main exhaust channel, the exhaust humidity is reduced while achieving the whitening effect, thus enabling the exhaust device to simultaneously possess the characteristics of corrosion resistance, stable operation, and economic and environmental protection.

The utility model discloses a connecting buffer device for an industrial gas engine, which relates to the technical field of connecting buffer equipment for engines, and comprises a mounting box body, four groups of guide columns are fixedly connected to the inner side of the mounting box body, and an upper mounting sliding plate is arranged above the inner side of the mounting box body; by means of the linkage design of the first damping rod and the second damping rod, vertical vibration of the engine is converted into composite motion of axial compression and transverse stretching or compression, three-dimensional vibration energy dispersion is achieved, a rotation linkage mechanism of the double-side rotating seat effectively avoids single-direction impact overload, and the vibration energy dispersion efficiency is improved. The transmission of vibration to an engine and an external rack is remarkably reduced, a penetrating type forced air cooling system is formed through an air inlet fan and multiple sets of heat dissipation mounting through holes, heat dissipation is directly conducted on a high-heat area at the bottom of the engine, through hole matrix layout is matched with mounting hole positions of engines of different sizes, the fixing function is achieved, meanwhile, the universality of an airflow channel is considered, and heat dissipation efficiency is improved. And the heat dissipation efficiency is improved.

This utility model discloses a leak-proof gas engine valve chamber cover, including a cover plate disposed above the gas chamber. One-way valves are evenly distributed on the top of the cover plate. A connecting plate is provided between the cover plate and the gas chamber. A sealing element is provided between the cover plate and the connecting plate. The sealing element includes a metal ring, with a rubber sleeve covering the metal ring. A pre-tightening mechanism is provided above the sealing element, comprising a bolt and a disc spring. In this utility model, by setting up a connecting plate, a liner plate, a cover plate, a sealing element, and a pre-tightening mechanism, and utilizing a disc spring, the vibration of the sealing element is reduced, improving its stability. By setting a one-way valve on the cover plate, a pressure balance channel is formed between the inner and outer sides of the cover plate, thereby achieving dynamic pressure compensation. This avoids uneven pressure at the joint surface between the cover plate and the connecting plate, prevents cover plate deformation, and thus prevents the sealing element from loosening and detaching from the mounting groove, improving the working stability of the sealing element.

The application discloses a kind of gas engine active precombustion chamber lean combustion comprehensive system and control method, belong to gas engine technical field.The system includes main combustion gas inlet pipeline, active gas inlet pipeline, active precombustion chamber and ECU.Active gas inlet pipeline is equipped with active gas inlet electric pressure regulating valve, active gas inlet total gas metering valve, each cylinder precombustion chamber entrance is equipped with active gas inlet single cylinder gas metering valve.ECU and gas inlet manifold pressure sensor and electric pressure regulating valve form closed loop pressure regulating unit, maintain the positive pressure difference between precombustion chamber and main combustion chamber;ECU and total metering valve, single cylinder metering valve, single cylinder exhaust temperature sensor form metering control unit, realize total air intake and single cylinder air intake independent closed loop regulation.The application controls precombustion chamber air intake pressure and each cylinder gas quantity accurately, combines the intercylinder balance control based on exhaust temperature, significantly improves the stability and uniformity of multi-cylinder gas engine lean combustion, effectively improves thermal efficiency.

The utility model provides a kind of ignition device, gas engine and production equipment, it is related to engine technical field, the ignition device includes primary coil, secondary coil, first magnetic element, second magnetic element, voltage monitoring coil and voltage indication module, wherein: primary coil and secondary coil are coupled by first magnetic element, and the number of turns of primary coil is less than the number of turns of secondary coil;Secondary coil and voltage monitoring coil are coupled by second magnetic element, and the number of turns of voltage monitoring coil is less than the number of turns of secondary coil;Voltage indication module is connected with voltage monitoring coil, voltage indication module is used to receive the first output voltage of voltage monitoring coil, and the size of the second output voltage of secondary coil is indicated according to first output voltage.The utility model can directly monitor the actual output voltage of ignition coil, improve voltage fluctuation monitoring precision and reliability under engine dynamic condition, reduce fault false alarm rate.

The invention belongs to the technical field of internal combustion engines, and provides a double-air-inlet-channel gas engine suitable for multiple fuels and an air inlet control method of the double-air-inlet-channel gas engine. The double-air-inlet-channel gas engine suitable for multiple fuels comprises an engine air cylinder, a piston, an air inlet channel and at least two kinds of gas inlet channel modules capable of being switched. The piston is arranged in the engine cylinder and does linear motion along the engine cylinder; the engine cylinder is provided with a cylinder cover, and the air inlet channel and the fuel gas inlet channel module are arranged on the cylinder cover. Each fuel gas inlet channel module has a cross sectional area suitable for being matched with a preset target gas fuel, and the cross sectional area is obtained through calculation based on the physical characteristics of the target gas fuel so as to ensure that the mass flow of fuel entering an air cylinder meets the requirement of the ideal air-fuel ratio under the standard working condition. The multi-fuel adaptability, the heat efficiency and the emission level of the engine are remarkably improved, meanwhile, the structure is simple, and the implementation cost is low.

The invention relates to the technical field of engines, and provides a pre-combustion chamber and a gas engine, the pre-combustion chamber comprises a pre-combustion chamber body, the pre-combustion chamber body is provided with a pre-combustion cavity and a plurality of spraying holes, the multiple spraying holes are formed around the axis of the pre-combustion cavity at intervals, the spraying holes are gradually-expanded holes, and the spraying holes are communicated with the pre-combustion cavity. The small-diameter end of the spray hole is communicated with the pre-combustion cavity, and the large-diameter end of the spray hole is suitable for being communicated with a main combustion cavity of an engine. The pre-combustion chamber can improve the ignition stability under the working conditions of cold start and low load; meanwhile, after the pre-combustion chamber is ignited, the gradually-expanded spray holes are beneficial to increasing the ignition area of the high-energy particle jet flow in the main combustion chamber, the problem that the spray holes are choked under the supersonic jet flow condition is avoided, the combustion speed is increased, and the risks of cyclic change and knocking are reduced.

The utility model relates to gas generator installation technical field, concretely is a kind of gas generator mounting seat reinforcing structure, including mounting seat, the front side and rear side of mounting seat inner wall are fixedly installed with several U-shaped positioning frame, the inside of mounting seat is provided with several stringers, and the front and rear ends of stringer are connected with the U-shaped positioning frame of corresponding position. This kind of gas generator mounting seat reinforcing structure is used in the cooperation of mounting seat, crossbeam, stringer, U-shaped positioning frame, bolt, nut, fitting groove, connecting hole and mounting hole. Stringer is fixed on U-shaped positioning frame by bolt and nut, crossbeam is inserted into stringer fitting groove, and the reinforcing mechanism formed effectively supports mounting plate and generator, enhances mounting seat overall structural strength, stability and reliability. When installing, operation is orderly, disassembly is convenient, crossbeam can be directly taken down, stringer can be removed by unscrewing bolt and nut, and it is convenient for later maintenance and replacement.

The present application relates to the technical field of fuel injection components for dual-fuel and gas engines, and particularly relates to an adjustable flow gas injection valve; comprising a gland, a solenoid valve assembly, a valve housing, a limiting block, a valve sheet, a valve seat, a locking retainer, an internal hexagonal cylindrical head screw, an armature, an O-shaped sealing ring, a return spring, an elastic retainer and a wire welded filter screen. The present application adjusts the lift by rotating the valve seat after the valve seat is installed in the valve housing, and after the lift is determined, the valve seat is locked again by the locking retainer to improve the connection strength of the valve housing and the valve seat. In addition, the valve housing and the valve seat are respectively engraved with scale lines and pointer lines, and the lift value can be read on site while rotating the valve seat, so that the flexible adjustment of the injection flow of the gas injection valve is realized in the production and assembly stage, so that the injection flow of the valves in the same batch is kept highly consistent, the power performance of the engine is improved, and the structure is simple, easy to realize and high in adjustment precision.

The utility model provides a connecting rod weighing tool, and relates to the field of gas engines. The connecting rod weighing tool comprises a connecting shaft and two weighing assemblies, each weighing assembly comprises a positioning shaft, a base and an electronic scale, one electronic scale is placed below the corresponding base, the two bases are fixedly connected with the connecting shaft, each base is provided with a placement position, and the positioning shaft is fixedly connected with the positioning shaft. One positioning shaft is placed on the corresponding placing position, and the axes of the two positioning shafts are located on the same horizontal plane. The installation state of the connecting rod is simulated through the connecting shaft, the two positioning shafts and the base, then the large end and the small end of the connecting rod are accurately measured through the two electronic scales, the connecting rods with the weight difference value within the same range are matched to the same engine, the assembly quality is ensured, and operation noise is reduced.