EP3329030A1 - Procédé et dispositif de revêtement d'une surface - Google Patents

Procédé et dispositif de revêtement d'une surface

Info

Publication number
EP3329030A1
EP3329030A1 EP16748091.2A EP16748091A EP3329030A1 EP 3329030 A1 EP3329030 A1 EP 3329030A1 EP 16748091 A EP16748091 A EP 16748091A EP 3329030 A1 EP3329030 A1 EP 3329030A1
Authority
EP
European Patent Office
Prior art keywords
coating
spray
jet
angle
spray angle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16748091.2A
Other languages
German (de)
English (en)
Other versions
EP3329030B1 (fr
Inventor
Ronald GÖLZ
Wolfram Wagener
Jochen ZIERHUT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP3329030A1 publication Critical patent/EP3329030A1/fr
Application granted granted Critical
Publication of EP3329030B1 publication Critical patent/EP3329030B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/42—Plasma torches using an arc with provisions for introducing materials into the plasma, e.g. powder, liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/082—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to a condition of the discharged jet or spray, e.g. to jet shape, spray pattern or droplet size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
    • B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0815—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1481—Spray pistols or apparatus for discharging particulate material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/134—Plasma spraying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/18—Other cylinders
    • F02F1/186—Other cylinders for use in engines with two or more pistons reciprocating within same cylinder
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3494—Means for controlling discharge parameters

Definitions

  • the present invention relates to a method for coating a surface containing a coating particle
  • Coating jet wherein the coating jet of a
  • Spraying device is directed at a spray angle to the surface, according to the preamble of patent claim 1.
  • the invention further relates to an apparatus for coating a surface by means of a coating jet containing a coating particle, wherein the
  • Coating jet is directed by a spraying device at a spray angle to the surface, according to the preamble of claim 10 and a coated with the inventive method
  • the generic method is used for coating a surface, wherein the coating particles containing
  • Coating jet is directed by a spray device at a predetermined spray angle to the surface to be coated.
  • a decisive quality criterion in such a coating process, in particular during thermal coating, is the angle of incidence of the coating jet on the surface to be coated and possibly also the speed of the coating particles of the coating Coating beam. Due to wear, assembly errors,
  • Produce substrate wherein detected by means of a digital camera at least one of the quality of the spray layer influencing feature of the thermal spraying process is controlled and / or monitored.
  • Device for thermal spraying wherein in a substantially horizontally extending plasma jet is injected from above a powder to be sprayed. It is monitored by means of a camera, whether the introduced from above into the plasma jet powder is melted in the center of the plasma jet or what is undesirable - not in the
  • Plasma jet penetrates or is blown through the plasma jet.
  • the image captured by the camera is used for optimal viewing
  • US 2006/0198944 A1 shows and describes a device for plasma spraying, in which powder particles are injected into the plasma jet from the side into a plasma jet directed horizontally onto a deposition surface.
  • powder particles which are melted in the plasma jet are sprayed onto the surface at an angle which deviates from the horizontal direction of the plasma jet.
  • Plasma spraying device wherein the powder particles to be deposited on a surface at an angle of 90 ° in a horizontal on the
  • Abscheoderober Structure directed plasma jet to be injected.
  • a camera is aimed at the capture surface and detects that on the screen
  • Object of the present invention is to provide a generic method for adjusting a coating jet, with which it is possible is to improve the coating quality and in particular to obtain a coating process uniform coated surface.
  • Patent claim 1 solved.
  • Coating jet containing coating particles wherein the coating jet is directed onto the surface from a spraying device at a spraying angle, the spraying angle during the
  • the invention provides that the coating jet is formed from at least two partial beams, each emerging from an outlet opening of an associated outlet channel of the spray device, wherein the respective axes of the outlet channels are at an angle to each other, that one of the outlet channels an injection channel for a coating particles containing first gas flow, wherein the outlet opening of this
  • Spray channel forms a directed onto the surface to be coated spray nozzle, that the other of the outlet channels is a control channel for a first gas stream deflecting the second gas stream, wherein the
  • Outlet opening of this control channel forms at least one control nozzle and that increases in a deviation of the determined spray angle from the predetermined target spray angle, the volume flow of a first partial beam of at least two partial beams and the volume flow of a second partial beam of the at least two partial beams is reduced.
  • This determination and adjustment of the spray angle according to the invention makes it possible, in a particularly advantageous manner, to realize either a continuous, constant maintenance of the spray angle during a coating operation, or to control the spray angle between two coating operations and for one or more subsequent spraying
  • the wear of the spray device or parts of the spray device can be detected in good time and optionally compensated before a wear-induced change in the spray angle leads to a faulty process result.
  • a plasma jet already containing the coating particles (first gas stream) by means of a side acting on this first gas stream second gas stream targeted deflected targeted deflected. This control of the first containing the coating particles
  • Gas flow through the second gas stream allows a targeted adjustment of the spray angle, without affecting the distribution of the
  • Coating particle is taken in the first gas stream.
  • the process of mixing the coating particles with the first gas stream is therefore separate in the present invention, in contrast to the prior art according to DE 198 20 195 A1 of the spray angle influencing separately
  • Image capture device is detected and when the spray angle is determined from the captured image of the coating jet.
  • the image acquisition of the coating beam from the side, so transversely,
  • the determination of the spray angle by means of the described image acquisition can be carried out particularly accurately when the coating jet emerges as a free jet from the spray device.
  • the adjustment of the spray angle can also be done in other ways, for example by pivoting provided with the outlet openings outlet nozzles for the partial beams or by pivoting of at least one spray nozzle for the coating jet or by the provision of mechanically variable beam deflecting means for at least one of the partial beams and / / or for the coating jet.
  • Partial beam and the reduction of the volume flow of the second partial beam always such that the sum of the volume flows of the partial beams is constant. In this way it is achieved that a change in the spray angle by changing the volume flows of the partial beams does not lead to a change in the quality of the coating due to a change in the total volume flow.
  • the increase of the volumetric flow of the first partial jet and the reduction of the volumetric flow of the second partial jet always occur in such a way that the energy content of the partial jet formed by the partial beams
  • Coating jet remains constant.
  • the energy content of a Coating particle contained gas jet is determined by the mass of the individual contained in a gas volume particles, the temperature of each particle, the speed of each particle and the (mostly negligible) energy content of the gas.
  • Method is the angle between the axes of the outlet channels a right angle, so that the partial beams impinge on each other at right angles.
  • the thermal coating process is
  • Spraying device with a particle flow generator is.
  • the method can also be designed as a kinetic coating method, wherein the particles generated in a particle flow generator at very high speed (for example, greater than 600 m / sec) on the zu
  • coating surface are applied.
  • the particle flow generator is flowed through by the first gas stream, which passes through as enriched with coating particles gas stream through the injection channel and exits the spray nozzle.
  • the first partial beam having the coating particles is a plasma jet generated by a plasma torch.
  • a plasma coating is used to control the
  • Energy content and the particle content in the coating jet remains constant while the spray angle is changed.
  • the invention also provides a device for adjusting a
  • Coating jet are given, in particular for
  • Patent claim 9 solved.
  • a device for coating a surface by means of a coating jet containing coating particles, wherein the coating jet can be directed onto the surface from a spraying device at a spray angle, in particular for carrying out a method according to one of the preceding claims, means are provided with which the spraying angle during the spraying angle
  • Coating process or between two coating operations can be determined and means are provided by means of which the spray angle is adjustable.
  • the invention provides that the
  • Spraying device is provided with a spray channel for a coating gas containing first gas stream and at least one control channel for the first gas stream deflecting the second gas stream, wherein the outlet opening of the spray channel forms a directed to the surface to be coated spray nozzle and wherein the outlet opening of the at least one control channel forms a control nozzle and where from the
  • Outlet openings emerging gas streams each have a partial beam and together form the coating jet that the axes of Exit channels are at an angle to each other and that the means by which the spray angle is adjustable, are means by which the volume flow of each exiting through the outlet channel gas flow is variable.
  • this device is for
  • Image evaluation is provided which receives from the at least one image detection device supplied image signals and determines therefrom the spray angle of the coating beam and / or incident on the surface angle of incidence of the coating beam.
  • Volumetric flow are formed by means of a respective actuator adjustable throttle devices.
  • Such automatically adjustable throttling devices make it possible to vary the gas flows in the control channel or in the injection channel in such a way that the respective required for the desired setting of the spray angle
  • volume flow passes through the channels. It is particularly advantageous if an adjusting or regulating device is provided which acts on the means for changing the volume flow, in particular the actuators of the throttle devices, each with an actuating or control signal. This allows a
  • the control device receives in this embodiment of the device as a controlled variable supplied by the image evaluation device spray angle and / or the angle of incidence. With this data, the setting or
  • Control then make the required adjustment of the partial beams and so adjust the spray angle of the coating jet to the desired level or track accordingly.
  • the spraying device is equipped with a particle flow generator.
  • the particle flow generator for example, a
  • Plasma torch may have a wire spray or a cold gas burner, generated together with the gas stream a metallic and / or ceramic particle mist as a coating jet.
  • a metallic and / or ceramic particle mist in conjunction with the gas stream as
  • Coating jet are formed.
  • Particle generator with a particle output power regulating signal applied. This makes it possible to control the particle density in the
  • the present invention is also a with a
  • the invention is directed to a coated with the inventive method surface of a cylinder inner wall of a piston-cylinder assembly. It is particularly advantageous if the method for coating the provided on the cylinder inner wall running surface of a piston-cylinder assembly is applied in an internal combustion engine, so that as a result of the process, such an internal combustion engine with inventively coated running surfaces of the present invention is included.
  • Fig. 2 is a schematically illustrated construction of a
  • Fig. 3 shows an alternative construction of a spraying device.
  • FIG. 1 shows a process diagram of a coating installation with which a particularly advantageous realization of a method according to the invention for adjusting a coating jet can be carried out.
  • Spraying device 1 is arranged such that it directs a coating jet S containing coating particles from a spray nozzle 10 at a predetermined spraying angle ⁇ onto a surface 2 to be coated.
  • the surface is preferably arranged perpendicular to a longitudinal axis x of the spraying device 1.
  • the image capture device 3 has a camera 30, which detects the coating beam S from the side, so that the spray angle ⁇ in a photograph taken by the camera 30
  • Image plane is located.
  • the camera 30 captures the entire
  • Coating jet S formed on the surface 2 impact area S ' is detected by the camera 30.
  • the determination of the spray angle ⁇ in the free jet that is, without the provision of the surface to be coated 2, take place.
  • the image taken by the camera 30 is recorded in the
  • Image capture device 3 by means of an (not shown) image sensor in a manner known to those skilled in electrical signals converted, which are forwarded to a Schmausberg unpleasant 31.
  • Image evaluation device 31 analyzes the image signals and determines therefrom the spray angle ⁇ and thus the incident on the surface 2 Impact angle ⁇ of the coating beam S. These determined angle data are then forwarded to an adjusting or regulating device 32. Stelloder controller 32 compares the angle (s) obtained
  • Angular deviation .DELTA..alpha Between the measured actual spraying angle and the desired spraying angle, an actuating signal is generated, which is forwarded to the spraying device 1 and adjusts the spraying angle .alpha. Of the coating jet S to the predetermined desired spraying angle in a manner to be described below. If such an adjustment is not possible, then a wear alarm signal is generated and preferably the further operation of the spray device 1 is prevented.
  • the spray angle ⁇ is not continuous, but between two coating operations. For example, a certain number of coating operations are carried out and then the spraying device 1 can be moved to a measuring and calibration position, which corresponds for example to the structure shown in Fig. 1, but preferably the surface to be coated 2 is omitted and the coating jet S is measured as a free jet. In this measuring and calibration position, the spraying angle ⁇ can then be adjusted or adjusted to a predetermined desired spraying angle. After such a calibration process can then again a plurality of
  • Coating operations are carried out. It is particularly advantageous if the compensated during such a calibration angular deviation is detected and set in relation to the provided between the two previous calibration processes coating performance. By updating this data it is possible to create a
  • FIG. 1 A possible construction of an injection device 1 which can be used for the method according to the invention and the device according to the invention is shown schematically in FIG.
  • the spraying device 1 has an elongated housing 1 'which extends along a longitudinal axis x of the spraying device 1 and which is also referred to as a spray lance.
  • Outlet passages 12, 14, each with an outlet opening 12 ', 14' open to the outside.
  • the outlet channels 12, 14 are not arranged parallel to each other, but the respective axes 12 ", 14" of the outlet channels 12, 14 are inclined at an angle ⁇ to each other. In the example shown in Fig. 2, the angle ⁇ is about 90 °.
  • the first channel 1 whose outlet channel 12 has an axis 12 "which runs parallel to the longitudinal axis x of the spraying device 1, is provided with a particle generator 17 which has a plasma torch 17.
  • This particle generator 17 is provided by a gas supply line 11 Flows through supplied process gas, wherein by means of the plasma torch 17 'melted particles are entrained by the gas stream.
  • the process gas jet provided with these coating particles passes through the
  • Outlet channel 12 and the spray nozzle 10 forming the outlet opening 12 'initially in the axis-parallel direction of the housing 1' of
  • Spraying device as a first partial beam S1.
  • Gas supply line 13 "supplied second gas, which may correspond to the process gas, but may also be just compressed air, introduced into the control channel forming second outlet channel 14, and exits from there through its control nozzle 18 forming an outlet opening 14 'and arrives as a second sub-beam S2 at an angle ⁇ on the first emerging from the spray nozzle 10 and the coating particles containing
  • This second partial beam S2 deflects the first partial beam S1 from its axis-parallel direction.
  • the first sub-beam S1 and the second sub-beam S2, which forms a control gas stream, combine to form a coating jet S, whose beam center axis S "is directed away from the control nozzle 18 by the spray angle ⁇ to the axis 12" of the spray channel 12 (in FIG ) is inclined.
  • a means of a respective associated actuator 15 ', 16' adjustable throttle means 15, 16 is provided in each of the two channels 1 1, 13 a means of a respective associated actuator 15 ', 16' adjustable throttle means 15, 16 is provided.
  • Actuators 15 ', 16' are connected via signal lines 15 ", 16" to the adjusting or regulating device 32 and can receive control signals from each of these.
  • the particle generator 17 is connected via a control signal line 17 "with the adjusting or regulating device 32 and can receive from this control signals.
  • another exemplary variant may be designed such that the one loaded with the coating particles
  • Fig. 3 Such a variant is shown schematically in Fig. 3, wherein like reference numerals as in the example of Fig. 2 relate to the same components.
  • the device rather than other than those described above Take design forms.
  • the device can hereby
  • image evaluation device 32 control or regulating device

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Plasma & Fusion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Metallurgy (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne un procédé de revêtement d'une surface (2) par un jet de revêtement (S) contenant des particules de revêtement, le jet de revêtement (S) étant dirigé par un dispositif de pulvérisation (1) sur la surface (2) avec un angle de pulvérisation (α), caractérisé en ce que l'angle de pulvérisation (α) est déterminé pendant l'opération de revêtement ou entre deux opérations de revêtement et en ce que, en présence d'un écart entre l'angle de pulvérisation (α) déterminé et un angle de pulvérisation de consigne prédéfini, l'angle de pulvérisation (α) soit réglé en étant réajusté à l'angle de pulvérisation de consigne.
EP16748091.2A 2015-07-30 2016-07-28 Procédé et dispositif de revêtement d'une surface Active EP3329030B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015112540.4A DE102015112540A1 (de) 2015-07-30 2015-07-30 Verfahren und Vorrichtung zum Beschichten einer Oberfläche
PCT/EP2016/068063 WO2017017215A1 (fr) 2015-07-30 2016-07-28 Procédé et dispositif de revêtement d'une surface

Publications (2)

Publication Number Publication Date
EP3329030A1 true EP3329030A1 (fr) 2018-06-06
EP3329030B1 EP3329030B1 (fr) 2020-03-18

Family

ID=56611240

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16748091.2A Active EP3329030B1 (fr) 2015-07-30 2016-07-28 Procédé et dispositif de revêtement d'une surface

Country Status (5)

Country Link
US (1) US11013099B2 (fr)
EP (1) EP3329030B1 (fr)
CN (1) CN107530724B (fr)
DE (1) DE102015112540A1 (fr)
WO (1) WO2017017215A1 (fr)

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DE102018208925A1 (de) * 2018-06-06 2019-12-12 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Abschirmen von Bauteilen
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Also Published As

Publication number Publication date
DE102015112540A1 (de) 2017-02-16
EP3329030B1 (fr) 2020-03-18
US11013099B2 (en) 2021-05-18
US20180077787A1 (en) 2018-03-15
CN107530724A (zh) 2018-01-02
CN107530724B (zh) 2020-01-21
WO2017017215A1 (fr) 2017-02-02

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