258 results about "Common rail" patented technology

The invention aims to provide a solid hydrogen storage hydrogen closed cycle hydrogen source generator for an underwater vehicle, which belongs to the field of dehydrogenation devices and comprises a reactor, a pressure stabilizing common rail pipe, a hydrogen storage material delivery pump, a solid hydrogen storage material storage unit, a solid hydrogen storage material spraying device, a product collecting device and a hydrogen storage unit. The hydrogen storage material conveying pump is connected with the pressure stabilizing common rail pipe, the solid hydrogen storage material storage unit and the solid hydrogen storage material spraying device, the hydrogen storage unit is connected with the pressure stabilizing common rail pipe, and the reactor is connected with the hydrogen storage unit. The solid hydrogen storage material is used for releasing hydrogen, one part of hydrogen is conveyed to the fuel cell to react for power output of the underwater vehicle, the other part of circulating hydrogen assists the hydrogen storage material in injection, and an underwater closed circulation mode suitable for the underwater vehicle is achieved. The solid hydrogen storage material conveying module and the circulating hydrogen supply module are matched, and rapid mixing of the solid hydrogen storage material and hydrogen and large-flow injection of the solid hydrogen storage material are achieved.

The invention relates to the technical field of high-pressure hydrogen storage of hydrogen fuel cell automobiles, and provides a high-pressure hydrogen storage bottle opening combination valve with a streamline runner and a control method. The combination valve integrates a high-pressure stop valve, a two-way flow regulating valve, a filter and a pressure / temperature / flow sensor, an air supply channel, an air inflation channel, a discharge channel and a cooling channel are designed, and the air supply channel and the air inflation channel are provided with a common rail type channel. A pilot-operated pressure reducing valve and a main runner bidirectional flow regulating valve are additionally arranged on the gas supply channel to form a two-stage pressure reducing system, so that the pressure and flow of hydrogen at an outlet are effectively limited, and the hydrogen is safely conveyed to a fuel cell; a redundant one-way valve is additionally arranged on an inflation channel to achieve rapid filling. Flow resistance and turbulent flow dissipation are remarkably reduced through a streamline channel, a sealing interface is reduced through modular integration, actuation response and power density are improved, and safety and stability of pressure reduction gas supply and high-pressure filling working conditions, intrinsic safety of the system and reliability of the whole life cycle are ensured.

The invention discloses a marine high-pressure common rail diesel engine MPC combustion control method based on a physical informatization neural network, and belongs to the field of marine high-pressure common rail diesel engine control. The problems that physical consistency of a model and a real machine is ignored and the generalization ability of the model is poor due to the fact that only data driving is relied on are solved. The method comprises the following steps: keeping a combustion midpoint unchanged, and acquiring in-cylinder pressures, in-cylinder maximum pressure rise rates, indication heat efficiency and emission data of different pilot injection fuel ratios and pilot main injection positive time intervals; calculating the average indicated pressure circulation change of the diesel engine, screening data and calculating the accumulated heat release amount and the combustion midpoint; obtaining an influence rule of related characterization parameters of combustion in a diesel engine cylinder, and determining a crank angle corresponding to pilot injection timing, a pilot injection fuel ratio, a pilot main injection interval boundary and an upper limit of a maximum pressure rise rate of cylinder pressure; a diesel engine in-cylinder combustion prediction output model and an MPC controller are constructed; and updating control parameters and combustion state data to realize closed-loop control. The method is used in energy-saving and emission-reducing fields.

The invention discloses a method and a system for monitoring pressure abnormity of a fuel oil common rail pipe of a marine main engine. The method comprises the following steps: acquiring historical operation parameter data and constructing a data set; the historical operation parameter data comprises historical host load data, historical host rotating speed data and historical fuel oil common rail pressure data; historical operation parameter data are preprocessed, an SVDD model is constructed and trained based on the historical operation parameter data, the model obtains a historical normal data hyper-sphere in a three-dimensional feature space, and the center and the radius of the hyper-sphere are obtained; similarly, real-time operation parameter data collected in real time are preprocessed and then input into the model, the distance between the real-time operation parameter data and the center of the hypersphere is obtained, and the value of the distance is compared with the value of the radius of the hypersphere in historical normal data; and when the numerical value of the distance is large, it is judged that the real-time operation parameter data is within an abnormal range, the fuel oil common rail pressure of the ship main engine is in an abnormal state, and an alarm signal is triggered. The method has the effect of low error rate.

According to an aspect of the present application, there is provided a radially deformable volume splitter (100; 200) for a fuel injection system (1) of a spark-ignition engine (2). The volume splitter (100; 200) can be tubular and elongate, extending along a longitudinal axis from a first end (102) to a second end (104). The volume splitter (100; 200) can comprise a deformable longitudinal slot (116) operable to deform the volume splitter (100; 200) radially from a first state for insertion into a cavity (18; 218) of the emulsion injection common rail (10) to a second state for use within the cavity (18; 218), and a set of slots (112a-112k) arranged on an outer surface (106) of the volume splitter (100; 200) to connect, in use, an inlet (20) of the cavity (18; 218) to one or more outlets (22a-22d) of the cavity (18; 218).

The application discloses a starting device for a marine methanol engine, which comprises a compressed air control unit, a compressed air starting unit, a supplementary combustion unit, a rotating speed signal sensor and a plurality of Hall sensors. The compressed air control unit comprises a pressure reducing valve, a first one-way valve and a first electromagnetic reversing valve. The compressed air starting unit comprises a first electromagnetic on-off valve, a second electromagnetic reversing valve, a first pneumatic reversing valve, a second one-way valve, a second pneumatic reversing valve and a silencer. The supplementary combustion unit comprises a second electromagnetic on-off valve, a common rail pipe, a supplementary combustion gas injection valve, a third one-way valve and a third electromagnetic on-off valve. The starting device can quickly realize the cold state starting and the hot state starting of the marine methanol engine by using a small number of valve combinations, has high automation degree and good integration degree, and conveniently and efficiently solves the difficult starting problem of the marine methanol fuel engine.

The invention relates to the technical field of engines, in particular to a marine methanol engine combustion control method and system which comprises a high-pressure common rail module, an injection quantity control module, an injection time control module, a multi-nozzle layout module and a preheating module. The high-pressure common rail module is electrically connected with the injection quantity control module, the injection time control module, the multi-nozzle layout module and the preheating module, and the multi-nozzle layout module is electrically connected with the injection quantity control module, the injection time control module and the preheating module, so that the injection quantity and the injection time of methanol can be accurately controlled; by accurately controlling the injection amount, a proper amount of methanol fuel can be provided according to the actual demand of an engine, waste and incomplete combustion of the fuel are avoided, the injection time of methanol in an air cylinder can be more reasonable by accurately controlling the injection time, the injection time can be better matched with the processes of air inlet, compression and the like, and the combustion efficiency is improved.

The invention relates to an injection system, an engine, a vehicle and an injection control method. The injection system comprises a high-pressure oil pump, a main injection loop and a pre-injection loop. The high-pressure oil pump is provided with a first output end and a second output end. The main injection circuit includes a first high pressure common rail tube fluidly connected with the first output, and a main injector connected with the first high pressure common rail tube. The pre-injection circuit includes a second high pressure common rail tube fluidly connected with the second output, and a pre-injector connected with the second high pressure common rail tube. The pre-injection circuit is configured to inject at a lower pressure than the main injection circuit. Through the arrangement of the integrated oil pump, the system structure is remarkably simplified, and the manufacturing cost is reduced. Meanwhile, the pressure of the two loops is independently adjustable, flexible combination of pre-injection and main injection can be achieved, the injection atomization effect and the combustion process are optimized, and therefore the dynamic property, economical efficiency and emission performance of the engine are comprehensively improved.

The present application relates to a kind of monomer pump common rail quick pressure building method, device and motor vehicle, before obtaining tooth signal, the first tooth signal obtained is virtual 0 number tooth, second tooth signal is virtual 1 number tooth, in turn analogies;When virtual N0 number tooth is obtained, according to the drive duration of pre-marking, drive monomer pump to run;During monomer pump continues to run to virtual 2N0 number tooth, if still not obtain tooth signal, and the pressure in common rail pipe rises, then with odd multiple N0 as the driving time of monomer pump, and the driving duration is N0 tooth signal;If the pressure in common rail pipe does not rise, then with even multiple N0 as the driving time of monomer pump, and the driving duration is N0 tooth signal, to common rail pipe pressure rise.

The invention relates to the technical field of switch rails, in particular to a production method of an elastic bendable switch rail for a compound dividing turnout, which comprises the following steps: determining the steel rail model of the switch rail according to the model of a stock rail; determining the machining range of the switch rail according to the steel rail model; precise cutting is conducted on the determined machining range through slicing machining, the horizontal inertia moment and the flexural rigidity of the switch rail are weakened, and an elastic bendable section is formed; the cut switch rail is subjected to precision verification; forging and pressing the point rail subjected to precision verification, and processing the section of the point rail into a common steel rail section consistent with that of the stock rail; the forged and pressed switch rail is cooled, straightened and detected, the switch rail produced through the method is stable and simple in structure, the problems that bolts are broken off, rail seams are eroded and the like are reduced, the reliability of the switch rail is improved, the service life of the switch rail is prolonged, and maintenance convenience of the switch rail is improved.

This utility model relates to a common rail injector with replaceable control valves, including a solenoid valve assembly, a metering block assembly, a needle valve assembly, and a locking cap. The solenoid valve assembly includes an injector body, an electromagnet, an armature, a control valve core, a first spring, and a valve ball, with the valve ball detachably mounted on the lower end of the control valve core. The metering block assembly includes a metering block and a ball valve seat, with the ball valve seat detachably fixed in a mounting groove. The needle valve assembly includes a needle valve body, a needle valve core, a control chamber sleeve, and a second spring. The injector body, metering block, and needle valve body are arranged sequentially from top to bottom and detachably fixed together by the locking cap. This utility model is easy to maintain and adjust, and can better meet the usage requirements of marine electronically controlled common rail fuel systems.

This invention relates to a method for calculating the dynamic wear of a plunger pair in a marine common rail jet pump. First, a dynamic model is established to solve for the forces and micro-motions (eccentricity and tilt angle) of the plunger. Then, based on e and , the oil film thickness and pressure are calculated, and the oil film bearing capacity and lateral load are balanced through iteration. Next, surface roughness is introduced to determine the lubrication state, and the Reynolds equation is modified to characterize mixed lubrication. Force balance iteration is performed again to obtain a more accurate oil film pressure and thickness distribution. Finally, based on the results of the modified model, the wear amount is calculated using the micro-protrusion contact theory and the Arcard wear formula. This method, by coupling plunger micro-motion, oil film state, surface morphology, and operating parameters, realizes the calculation of dynamic wear, improves the operating condition adaptability of wear assessment, and provides a certain basis for the condition monitoring and life assessment of the plunger pair.

This invention provides a test method for determining injection fusion in multiple injections of a high-pressure common rail system, comprising the following steps: S1. Constructing a high-pressure common rail system injection pattern test system to test the injection pattern of two injections: pre-injection + main injection; S2. Constructing a high-speed photography direct-view test system for the injection process of the high-pressure common rail system to test the spray development characteristics under injection intervals; S3. Processing the images of the spray development process of multiple injections of the high-pressure common rail system, and repeating the spray development characteristic test until the fuel sprays of the two injections merge. The test method for determining injection fusion in multiple injections of a high-pressure common rail system described in this invention employs a spray visualization test method, obtaining the actual development process of real fuel spray in the cylinder, which can accurately determine whether actual fuel spray fusion has occurred in the cylinder, solving the problem of misjudgment of injection fusion based on control signals and injection pattern curves.

The invention discloses a coating film repairing and cleaning device for a high-pressure common-rail fuel system, and belongs to the technical field of engine cleaning equipment.The coating film repairing and cleaning device comprises a cleaning table, a liquid storage cylinder is fixedly installed in the middle of the top end of the cleaning table, and a high-pressure liquid pump and a condenser are fixedly installed at the two ends of the cleaning table respectively; the inlet end and the outlet end of the liquid storage cylinder are connected with a condenser and a high-pressure liquid pump correspondingly, symmetrically-arranged positioning plates are fixed to the two ends of the top of the filtering frame, and when the filtering assembly is cleaned, the stirring transverse rod can lift the positioning plates to drive the filtering frame to be separated from the liquid storage cylinder. And through linkage cooperation with the filtering assembly, the multi-stage filter screen is convenient to quickly disassemble and assemble, convenient to clean or replace, capable of saving the maintenance time, compact and flexible in overall structure, capable of simplifying the cleaning agent treatment period and capable of effectively improving the cleaning work efficiency.

The invention relates to the technical field of ship positioning, and discloses a ship common rail type combined roller trolley positioning device which comprises a positioning pile, a driving assembly is arranged outside the positioning pile, and the driving assembly can drive the positioning pile to move horizontally and ascend and descend. The positioning pile can be driven to move to be inserted into seabed soil in cooperation with a driving assembly, so that a ship can be stably positioned, the positioning pile can be adjusted, it can be guaranteed that a positioning hole is aligned with an insertion hole, and therefore it is guaranteed that a follow-up plug pin can be smoothly inserted into the positioning hole to complete positioning of the positioning pile; by means of the structure, heat can be transferred to the gauge pile in cooperation with the rubber ring, water mist on the surface of the gauge pile is evaporated, the situation that the rubber ring and the gauge pile slip due to the water mist cannot occur subsequently, and smooth adjustment of the gauge pile is guaranteed.

The invention discloses a metering valve eccentric wear control method, system and equipment and a readable storage medium, and relates to the field of diesel engine high-pressure common-rail fuel system control, in particular to the steps that a fuel metering valve is controlled to be driven at a preset first duty ratio; after the fuel oil metering valve is continuously driven for a preset first duration according to the first duty ratio, the fuel oil metering valve is controlled to be continuously driven for a preset second duration according to a preset second duty ratio, and the first duty ratio is larger than the second duty ratio; and the steps are repeatedly executed for preset times to prevent eccentric wear of the metering valve. The problem that eccentric wear of the fuel metering valve needs to be solved urgently at present can be prevented on the premise that cost is not increased.

This invention discloses an integrated gas distribution device and method for a dual-fuel engine gas injection system in the field of dual-fuel engine technology. The device includes a common rail system, a pressure replenishment component, and a pulse pressure replenishment mechanism. The common rail system includes a common rail pipe and multiple injection valve supply pipes equipped with pressure sensors installed on the common rail pipe. This invention integrates electromagnetic valves capable of high-frequency pressure replenishment into the common rail system. Each electromagnetic valve alternately replenishes pressure to the injection valve supply pipes in a pulse manner, effectively reducing pressure loss in the injection valve supply pipes caused by the length of the common rail pipe and flow diversion. This significantly improves the stability and uniformity of gas injection, which is beneficial for stable engine operation and extends engine lifespan.

The invention provides a linear guide rail grinding machine, and belongs to the technical field of grinding machine equipment. The technical problem that in the prior art, the protection effect is poor is solved. The linear guide rail grinding machine comprises a machine body and a grinding device, a workbench used for conveying a guide rail is arranged on the machine body, a grinding housing is arranged on the grinding device, and the linear guide rail grinding machine is characterized in that a first protective housing and a second protective housing are arranged between the two ends of the grinding housing and the two ends of the machine body respectively, and a first negative pressure opening is formed in the grinding housing; a second negative pressure opening and a third negative pressure opening are formed in the inner end and the outer end of the first protective cover correspondingly, the first negative pressure opening, the second negative pressure opening and the third negative pressure opening are connected to a connecting pipeline in parallel and connected with a negative pressure pumping purifier, an air inlet assembly is connected to the grinding cover, and a common rail type double-sliding door located between the first negative pressure opening and the third negative pressure opening is arranged on the first protective cover. A feeding opening extending in the axial direction of the lathe bed is formed in the second protective cover, and a door opening and closing mechanism capable of being opened in the radial direction is arranged on the feeding opening. The device has the advantages of being good in protection effect, high in stability, high in safety and the like.

The utility model discloses a long-hole workpiece inner hole cleaning device, and relates to the field of workpiece machining, the long-hole workpiece inner hole cleaning device comprises a supporting seat, a grinding motor is fixed on the supporting seat, a rotating shaft is fixed at the output end of the grinding motor, a grinding head is fixed at one end, away from a grinding cleaning motor, of the rotating shaft, and a moving mechanism is arranged on the supporting seat. A fixing mechanism is arranged on the supporting seat, a controller is arranged on one side of the supporting seat, and a fuel oil common rail is arranged on the supporting seat. The fuel oil common rail needing to be cleaned is placed on the fixing structure, the fixing mechanism fixes the fuel oil common rail, then the moving mechanism drives the fixing mechanism, the fixing mechanism drives the fuel oil common rail, then the grinding head is inserted into an inner hole of the fuel oil common rail from one end of the fuel oil common rail, and then the grinding head grinds and cleans the fuel oil common rail. Therefore, the grinding head can be stably inserted into the fuel oil common rail, the possibility that the grinding head deviates is reduced, and an inner hole of the fuel oil common rail can be conveniently cleaned.

This utility model relates to the field of cam divider technology and proposes a noise-reducing cam divider, including a cam divider, a buffer mechanism, and a lubrication mechanism. The cam divider consists of a housing, cam rollers, a common rail cam, and an indexing plate. The buffer mechanism is located at the bottom of the cam divider to buffer the vibrations generated during operation. The lubrication mechanism is located on one side of the housing to add lubricating oil between the cam rollers and the common rail cam. During the operation of the cam divider, vibrations caused by itself and external factors generate noise. The vibration force is transmitted through multiple springs and dampers via hinged support rods one and two, which are respectively connected between the fixed plate and the mounting plate. The combined effect of these springs and dampers effectively buffers and cancels the vibration force, thereby stabilizing the operation of the cam divider and controlling vibration and noise to a very small and smooth level.

According to the high-pressure common-rail fuel injection pump, descending reset of the plunger is forced, a plunger reset spring is not needed, meanwhile, an oil delivery pump is omitted, two one-way valves are arranged in a low-pressure oil way, and necessary cooling and / or lubricating fuel oil is provided for the fuel injection pump. As a result, a smaller size, a higher applicable rotational speed, lower noise, in particular a lower overall cost, is achieved.

The present application provides a rail pipe assembly for dimethyl ether fuel, which can reduce fuel leakage and provide fuel purging function. The rail pipe assembly comprises: a common rail pipe, which has a high-pressure cavity for containing dimethyl ether fuel inside; an oil inlet end cover, which is installed at one end of the common rail pipe, and has a first one-way valve assembly and a second one-way valve assembly communicating with the high-pressure cavity, the first one-way valve assembly being used for feeding high-pressure liquid dimethyl ether fuel into the high-pressure cavity, and the second one-way valve assembly being used for feeding purging medium into the high-pressure cavity; an end cover, which is installed at the other end of the common rail pipe; at least one valve seat, which is installed on the common rail pipe and has a middle hole communicating with the high-pressure cavity at one end; and at least one functional component, which is installed on the valve seat and communicates with the other end of the middle hole of the valve seat. The installation positions of the oil inlet end cover, the end cover and the valve seat have spaces for containing leaked dimethyl ether fuel respectively, and the dimethyl ether fuel in each space is led out of the rail pipe assembly through a leakage joint.

The invention provides a diesel-electric hybrid power assembly capable of adapting to an extremely cold environment, and relates to the technical field of power equipment. The assembly comprises a V-shaped eight-cylinder high-pressure common-rail diesel engine, a 35kW permanent magnet synchronous generator and a diesel-electric hybrid power assembly controller which are coaxially connected in series through a Gisinger elastic coupling, and a modular integrated design is adopted. The diesel engine adopts a V-shaped 90-degree layout, comprises an engine body assembly, a cylinder cover assembly, a crank connecting rod mechanism and the like, and is equipped with an air inlet heating module, a 160MPa high-pressure common rail system and a-68 DEG C cooling / lubricating adaptive component; the generator has a starting and generating integrated function, and the low-temperature starting torque is 400 Nm; and the diesel-electric hybrid power assembly controller realizes electromechanical cooperative control. The problems that a power assembly is difficult to start and low in efficiency in an extremely cold environment are solved, stable operation at-56 DEG C to + 50 DEG C can be achieved, and the power assembly is suitable for equipment such as vehicles and engineering machinery in severe cold areas and has the advantages of high reliability and energy efficiency.

The present application relates to a kind of diesel engine sliding bearing temperature monitoring and protection device, for real-time monitoring the temperature of diesel engine sliding bearing, and when bearing overheating, automatically adjust the amount of oil cooling, to ensure the normal operation of diesel engine.The device includes at least three machine belt pumps, fixed to custom metal frame by flange, and engaged with pinion;Lubricating oil is supplied to machine belt pump through inlet pipe, after flow control valve flow limiting, through pipeline distribution to each bearing and sprocket for lubrication and cooling.At the same time, hydraulic oil output pipe delivers the hydraulic oil after pressure boost to diesel engine hydraulic oil common rail pipe, for driving diesel engine fuel injection valve and exhaust valve;Also provided with at least three embedded bearing temperature sensors, respectively installed at the bearing of pinion, real-time monitoring bearing temperature.The present application has the advantages of compact structure, monitoring accuracy, rapid response, etc., can effectively prevent the failure caused by bearing overheating, improve the reliability and service life of diesel engine.

The utility model relates to the technical field of parallel elevator mounting structures, and solves the problems that two elevator cars are simultaneously moved and limited only through one common rail, a reinforcing structure is lacked, the common rail is bent due to larger external force, and the safe operation of an elevator is influenced. The parallel elevator mounting structure comprises a common rail, connecting blocks are slidably connected to the two sides of the common rail, a car body is fixedly connected to the side faces of the connecting blocks, a machine placing beam is fixedly connected to the top end of the common rail, and supporting frames are fixedly connected to the two sides of the machine placing beam in an axial symmetry mode. The top face of the supporting frame is fixedly connected with a limiting frame, a counterweight filler steel cable for providing lifting power for the counterweight filler is arranged in the limiting frame, the surface of the common rail is fixedly connected with mounting beams used for bearing mounting loads in an axial symmetry mode, and one end of each mounting beam is provided with a mounting hole used for bolt connection.

This safety valve disposed in a common-rail fuel injection device comprises: a piston valve; and a piston-valve accommodating housing that includes a piston-receiving surface. The piston valve includes: a valve outer peripheral surface that fits in slidably against the piston-receiving surface; a plurality of slits each extending in the valve outer peripheral surface along the direction of fuel flow in the housing, the plurality of slits being disposed spaced apart circumferentially around the valve outer peripheral surface and also defining slit flow paths for the fuel to flow between the valve outer peripheral surface and the piston-receiving surface; and a circumferential groove extending circumferentially so as to connect to each of the plurality of slits.

A seat belt buckle arrangement for a row of seats in a motor vehicle, comprising at least two seat belt buckles (2) each comprising a buckle part (3) and a fastening component (4) connected thereto, and a common rail (5) on which the fastening components (4) are attached in different positions, wherein the rail (5) has a groove (6) open at least on one side and undercut on both sides, into which the fastening components (4) are inserted with a form-compatible section (9) and on which the fastening components (4) can be fastened in any positions by means of respective fastening elements (10).

The invention discloses a multi-point single-point gas-liquid double-injection methanol engine. The multi-point single-point gas-liquid double-injection methanol engine is characterized in that an inlet of a gas inlet channel methanol gas rail is communicated with a first outlet of a methanol pump; the multi-point methanol nozzle group is arranged at the methanol gas rail of the gas inlet channel, and is used for spraying methanol liquid to a plurality of cylinder cover gas inlet channels corresponding to the multi-point methanol nozzle group; an inlet of the methanol evaporator is communicated with a second outlet of the methanol pump; an inlet of the gas methanol common rail is communicated with an outlet of the methanol evaporator; an inlet of the single-point methanol nozzle is communicated with an outlet of the gas methanol common rail; the single-point methanol nozzle is arranged on the methanol-air mixer and is used for spraying methanol gas into the methanol-air mixer, and the gas inlet end of the methanol-air mixer is communicated with the gas outlet end of the throttle valve; and the control system is in electrical data connection with the components. The methanol evaporation level can be improved by adjusting the injection amount of single-point injection of the air inlet channel, and the problem that the power and torque of a traditional methanol engine are difficult to improve due to insufficient evaporation heat is solved.

The utility model provides a kind of marine high-pressure common rail diesel engine heavy oil processing system, it is related to ship power system technical field, including light diesel oil supply unit, heavy diesel oil pretreatment unit;Light diesel oil supply unit includes light diesel oil filter, light diesel oil tank, first flowmeter, buffer tank, heavy oil circulating pump, heater, homogenizer and diesel engine pre-filter connected by pipeline in turn, finally connects to the fuel import of diesel engine;Heavy diesel oil pretreatment unit includes fuel sediment tank, heater, oil separator and fuel daily use cabinet connected by pipeline in turn.The utility model solves the problem that existing marine high-pressure common rail diesel engine heavy oil processing system exists pipeline easy to block, poor oil quality, system is not integrated when using.

The invention relates to the technical field of grinding machines, in particular to a dust-free grinding machine applied to automobile piping inner surface grinding, which comprises a machine body, and a fixing mechanism and a grinding wheel frame which are arranged on the machine body, the fixing mechanism comprises an inner cylinder and an outer cylinder which are fixedly arranged on the machine body, the inner cylinder is fixedly arranged in the outer cylinder, and the grinding wheel frame is fixedly arranged in the inner cylinder. The left end and the right end of the inner cylinder are each provided with a plurality of circumferential uniform parts. A common rail pipe is placed in the inner cylinder, a high-pressure connector on the common rail pipe is placed in the positioning hole, the two ends of the common rail pipe are clamped and fixed through the first clamping plate, the situation that the end, away from the chuck, of the common rail pipe moves is avoided, the stability of the common rail pipe during grinding is improved, meanwhile, the high-pressure connector of the common rail pipe is clamped and fixed through the second clamping plate, and the grinding efficiency is improved. The common rail pipe can be centered and positioned in the front, back, left and right directions, the stability of the middle section of the common rail pipe is improved, the common rail pipe can be limited in the circumferential direction, and the situation that the common rail pipe rotates in the grinding process is avoided.