CN112295767A

CN112295767A - Spraying device for homogenizing fog liquid of automobile exterior paint

Info

Publication number: CN112295767A
Application number: CN202011113195.2A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-17
Filing date: 2020-10-17
Publication date: 2021-02-02

Abstract

The invention discloses a spraying device for homogenizing mist liquid of automobile exterior paint, which comprises an inner spray gun, wherein the inner spray gun comprises a gas circuit handle, a tank interface, a paint tank, an inner nozzle and an inner spray pipe, one end of the gas circuit handle is connected with a pressure gas source, the other end of the gas circuit handle is connected with the inner nozzle, the side wall of the end part of the gas circuit handle, which is connected with one end of the inner nozzle, is connected with the paint tank through the tank interface, the spraying end of the inner nozzle is connected with the inner spray pipe, and the inner wall of the inner spray. The spraying device further comprises an outer spraying gun, the outer spraying gun comprises a gun body shell and an outer spraying pipe, one end of the gun body shell is connected with a pressure air source, the other end of the gun body shell is connected with the outer spraying pipe, the gun body shell is further used as a shell body to wrap up an air path handle, the outer spraying pipe wraps up an inner spraying pipe, shell threads are arranged on the inner wall of the outer spraying pipe, the spraying device further comprises a gas distribution pipeline, the gas distribution pipeline comprises a main pipe and two branch pipes, the main pipe is provided with a main valve, the two branch pipes are respectively provided with a first pressure regulating valve and a.

Description

Spraying device for homogenizing fog liquid of automobile exterior paint

Technical Field

The invention relates to the technical field of paint spraying equipment, in particular to a spraying device for homogenizing fog liquid of automobile exterior paint.

Background

The spraying of the exterior paint of the automobile needs a spraying device, and generally a spray gun introducing air flow from the tail part. The spray gun is followed by a paint can, and the gas draws paint up as it flows through the spray gun and mixes and ejects it through the nozzle.

In the prior art, paint atomization is generally completed by a nozzle, only a liquid block is mechanically crushed into individual fog droplet micro-blocks through impact and other modes, uniformity exists in a ceiling, paint mist sprayed out through the nozzle is completely dispersed nearby the nozzle, edge fog droplets are blocked by surrounding air and often cannot reach a spraying surface, the spraying environment is deteriorated, operators in the spraying system must wear perfect spraying clothes, in addition, the original paint mist edge air is mixed with air flow and sprayed on a vehicle body on the path from a spray gun to the vehicle body surface, dust cannot be mixed in the process, although a spraying workshop has a purification system, if a high-precision clean environment is required, the cost of the prepared purification system is higher.

Disclosure of Invention

The invention aims to provide a spraying device for homogenizing mist liquid of automotive exterior paint, which solves the problems in the background technology.

In order to solve the technical problems, the invention provides the following technical scheme:

the utility model provides a spraying device of car finish homogenizing fog liquid, spraying device includes interior spray gun, and interior spray gun includes gas circuit handle, jar interface, paint can, interior nozzle and interior spray tube, and gas circuit handle one end is connected pressure air supply, one end and is connected interior nozzle, connects on the gas circuit handle on the tip lateral wall of the one end of interior nozzle through a jar interface connection paint can, and interior spray tube is connected to the injection end of interior nozzle, is equipped with the internal thread on the interior spray tube inner wall. The air path handle guides the high-speed airflow to wrap the paint liquid sucked from the paint tank and then the paint liquid is sprayed out from the inner nozzle, the nozzle does not need to use the traditional nozzle with an atomization function, but only needs to be used as a spraying outlet of the oil-gas mixture, the internal thread on the inner wall of the inner spray pipe can lead the oil-gas mixture to be sprayed to spirally advance, an oil-gas column is formed after the oil-gas column is sprayed out from the spray pipe, the sectional area of the oil-gas column is continuously enlarged due to the spiral shape, the enlarging rate of the oil-gas column is related to the ratio of the spiral speed and the advancing speed, but not in a linear relation, because the inner core part is not provided with components to compensate and form micro vacuum during the enlarging, the oil-gas column is prevented from further enlarging, the tail end of the oil-gas column is sprayed on the surface to be sprayed after the oil-gas column is enlarged, the, also can prevent that the air from sneaking into, traditional atomizing nozzle lets paint fog diffusion at nozzle exit directly, sneak into a lot of ambient air at the in-process of advancing, although air purification has been done in the spraying space of vehicle, the technology that the dust was got rid of, but also can not prevent the slight dust in the air completely, if the environment of spraying paint of high cleanliness factor, then the input of factory building of spraying paint can be very high, and the cyclone preceding oil feed gas column in this application, greatly reduced the possibility that the dust got into, and, because not nozzle atomizing diffusion, so, most oil mist liquid drops all arrive the spraying surface, rather than spreading in the ambient air, the occasion of spraying paint can be cleaner, reach clean effect.

Further, the spraying device further comprises an outer spraying gun, the outer spraying gun comprises a gun body shell and an outer spraying pipe, one end of the gun body shell is connected with a pressure air source, one end of the gun body shell is connected with the outer spraying pipe, the gun body shell is further used as a shell to wrap up an air path handle, the outer spraying pipe wraps up an inner spraying pipe, shell threads are arranged on the inner wall of the outer spraying pipe, the spraying device further comprises a gas distribution pipeline, the gas distribution pipeline comprises a main pipe and two branch pipes, the main pipe is provided with a main valve, the two branch pipes are respectively provided with a first pressure regulating valve and a second pressure regulating valve. The air distribution pipeline supplies air for the inner spray gun and the outer spray gun respectively, the inner spray gun uses the original paint spraying principle, on the basis, the outer spray gun also sprays a circular airflow which wraps the inner core paint mist, and the circular airflow also spirally advances, so that the possibility of being broken away when the air in front is broken is reduced, in the using process, the circular airflow wraps the inner core paint mist and spirally advances, so that the paint can reach the spraying surface completely, in addition, the circular airflow wraps the paint column, when the spraying device horizontally moves to spray a horizontal surface, the circular airflow column firstly contacts the spraying surface, the cleaning effect is achieved, and the surface is firstly cleaned; furthermore, the paint is diluted in advance when in use, namely a high-concentration paint stock solution and a diluting solvent are mixed into a spraying solution with a desired proportion, and then the spraying solution is sprayed on the surface of a vehicle body, the diluting agent often contains more volatile components, so that the paint is volatilized and dried after being sprayed to obtain a final paint surface, because the paint contains more volatile components, the liquid volatilization is caused because the partial pressure of the components near the liquid surface does not reach the saturated vapor pressure of the components, the components can volatilize faster by reducing the environmental pressure, the pressure is reduced in various ways, the flow rate is increased to be one of the modes, the oil gas column can be quickly vaporized on the annular interface of two layers of air flows after being sprayed from the inner spray pipe, more paint solvent components are mixed into the annular air flow, and the inner core paint mist has a larger absolute speed standard value because of spiral advancing, therefore, a large amount of solvent is vaporized into a gaseous state in the inner core paint mist, the vaporization process is generated along with the speed increase of the whole oil-gas column, and the gas is separated out in no sequence, so the atomization effect is greatly superior to that of the traditional nozzle type mechanical atomization method, after the oil mist impacts a spraying surface, the speed is rapidly reduced, the pressure is increased, the solvent components are liquefied again, the vaporization process absorbs partial heat from the surrounding air on an advancing path, and the heat is released in the liquefaction process of the surface of a vehicle body at the moment of spraying, so that the slight heating effect is realized on the spraying surface, and the wettability is better; the solvent vaporized near the interface has a low concentration of components on the outer air surrounding ring of the outer ring, so much solvent is vaporized and mixed into the outer air surrounding the outer ring, as shown in the figure, an annular region is arranged outside the spraying region, the annular region corresponds to the annular air column, in the path of travel of the spray device, the non-sprayed areas are first purged and then some of the solvent component is liquefied upon striking the surface to be sprayed, as a wetted substrate for the incoming developed paint, and for the area which is sprayed, a solvent layer can be plated on the color development paint layer to be used as a covering of the color development component in the paint, although volatile over time, may serve the purpose of protecting the paint color developing components during the spraying process and, according to this purpose, in the formulation of spray paints, a greater proportion of solvent component should be placed, at least five to ten percent higher than the proportion of components conventionally sprayed.

Furthermore, the inner spray pipe and the outer spray pipe are conical, and the conical tips face outwards. Because each medium can be spirally dispersed after being sprayed from the inner spray pipe and the outer spray pipe, in order to reduce the spiral dispersion effect, the mediums are firstly folded towards the spiral center line in the spraying device, and the distance between the end part of each spray pipe and the spraying surface is controlled according to the spraying area.

Preferably, the outer spray pipe and the gun body shell are detachably connected, and the inner spray pipe and the inner nozzle are detachably connected. The detachable connection is convenient for assembling and replacing the spray pipe.

Furthermore, the outer wall of the inner spray pipe is also provided with an external thread, and the rotation direction of the external thread is the same as that of the shell thread. The region between inner spray tube outer wall to outer spray tube inner wall is that annular air current spiral takes place the position, also sets up the external screw thread on inner spray tube outer wall and can let the spiral take place more fully.

Furthermore, the difference between the specifications of the threads of the shell and the threads of the external threads is 2-3 specifications. The specification refers to the thread major diameter numerical values of the first specification series in the standard thread list, and the difference is 2-3 specifications, so that the passing clearance of the outer ring airflow is kept at a small degree, and the spiral is fully generated.

Further, the thread direction of the external thread is opposite to that of the internal thread. The spiral direction of the outer ring airflow column is opposite to the spiral direction of the inner core paint mist, the outer ring area is completely gaseous components, the inner core part is in a gas-liquid mixed state, obvious shearing force can be caused at the interface, the passing resistance is increased, one is to prevent liquid components in the inner core paint mist from diffusing into the outer ring layer, and the liquid components in the inner core paint mist are color development components in the paint.

Furthermore, the pitch diameter ratio of the external thread is larger than that of the internal thread, and the pressure reduction amplitude of the first pressure regulating valve is larger than that of the second pressure regulating valve. The pitch diameter ratio determines the ratio of the advancing speed of the medium column sprayed out by the spray pipe to the spiral speed, the larger the pitch diameter ratio, the larger the ratio of the advancing speed to the spiral speed, therefore, the outer annular airflow with the larger pitch diameter ratio has the larger advancing speed, and the higher-pressure gas enters the outer spray gun by matching with the second pressure regulating valve, so the airflow speed at the spraying position of the outer spray pipe is larger, the outer annular airflow with the larger speed wraps the inner core paint mist, so that the solvent components penetrating through the inner and outer layer interfaces in the inner core paint mist can all impact the spraying surface, if the speed relationship is opposite, namely the advancing speed of the outer annular airflow is smaller than that of the inner core paint mist, some solvent components can be retained in the outer annular airflow, and the purging and wetting effects on the surface to be sprayed are remarkably reduced and delayed.

Compared with the prior art, the invention has the following beneficial effects: the invention takes the spiral advance as the diffusion process of the paint mist, the gas column state of the spiral advance is stable, and the original air in the front space is easy to break; the outer spray gun is provided with an additional protective layer of paint mist, a to-be-sprayed area on a spraying moving path is swept, the spiral airflow can have a larger speed scalar quantity under the same advancing speed, the pressure is reduced, volatile solvent components are vaporized and separated out, the process is instantaneous, the atomization effect is greatly superior to that of a streaming impact type nozzle, after the vaporized solvent components are mixed into the outer airflow, the to-be-sprayed area can be wetted in advance, and a volatile water-based covering film is sprayed on an area sprayed with the color-developing components in the paint again, the color-developing layer is protected in the spraying process, the paint has a larger advancing speed and an outer covering layer, and the condition that the paint mist drops of the traditional spray gun are scattered is greatly reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the construction of the inner lance of the present invention;

FIG. 3 is a schematic view of the construction of the outer lance of the present invention;

FIG. 4 is a schematic diagram of the gas stream injection of the present invention;

FIG. 5 is a flow analysis plot within a gas flow column of the present invention;

fig. 6 is a schematic view of the movement of the present invention over a spray surface.

In the figure: 1-inner spray gun, 11-gas path handle, 12-tank interface, 13-paint tank, 14-inner spray nozzle, 15-inner spray pipe, 151-inner screw thread, 152-outer screw thread, 2-outer spray gun, 21-gun body shell, 211-inner chamber, 22-outer spray pipe, 221-shell screw thread, 3-gas distribution pipeline, 31-main valve, 32-first pressure regulating valve and 33-second pressure regulating valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides the following technical solutions:

the utility model provides a spraying device of car finish homogenization fog liquid, spraying device includes interior spray gun 1, interior spray gun 1 includes gas circuit handle 11, jar interface 12, paint can 13, interior nozzle 14 and interior spray tube 15, gas circuit handle 11 one end is connected the pressure air supply, interior nozzle 14 is connected to one end, connect a paint can 13 through jar interface 12 on the tip lateral wall of the one end of interior nozzle 14 on the gas circuit handle 11, interior spray tube 15 is connected to the injection end of interior nozzle 14, be equipped with internal thread 151 on the 15 inner walls of interior spray tube. The air path handle 11 is used for guiding high-speed airflow to wrap paint liquid sucked from the paint can 13 and then spraying the paint liquid from the inner nozzle 14, the nozzle does not need to use a traditional nozzle with an atomization function any more, but only needs to be used as a spraying outlet of an oil-gas mixture, the internal thread 151 on the inner wall of the inner spray pipe 15 can enable the oil-gas mixture to be sprayed to spirally advance, an oil-gas column is formed after the oil-gas mixture is sprayed from the spray pipe 15, the sectional area of the oil-gas column is continuously enlarged due to the spiral shape, the enlarging speed of the oil-gas column is related to the ratio of the spiral speed and the advancing speed, but not a linear relation, because no component is compensated at the inner core part to form micro vacuum during enlarging, the oil-gas column is prevented from further enlarging, after the oil-gas column is enlarged, the tail end is sprayed on the surface to be sprayed, the spiral advancing stability is good when the oil-gas, also can prevent that the air from sneaking into, traditional atomizing nozzle lets paint fog diffusion at nozzle exit directly, sneak into a lot of ambient air at the in-process of advancing, although air purification has been done in the spraying space of vehicle, the technology that the dust was got rid of, but also can not prevent the slight dust in the air completely, if the environment of spraying paint of high cleanliness factor, then the input of factory building of spraying paint can be very high, and the cyclone preceding oil feed gas column in this application, greatly reduced the possibility that the dust got into, and, because not nozzle atomizing diffusion, so, most oil mist liquid drops all arrive the spraying surface, rather than spreading in the ambient air, the occasion of spraying paint can be cleaner, reach clean effect.

The spraying device further comprises an outer spraying gun 2, the outer spraying gun 2 comprises a gun body shell 21 and an outer spraying pipe 22, one end of the gun body shell 21 is connected with a pressure air source, one end of the gun body shell is connected with the outer spraying pipe 22, the gun body shell 21 is further used as a shell to wrap up the air channel handle 11, the outer spraying pipe 22 wraps up the inner spraying pipe 15, the inner wall of the outer spraying pipe 22 is provided with shell threads 221, the spraying device further comprises a gas distribution pipeline 3, the gas distribution pipeline 3 comprises a main pipe provided with a main valve 31 and two branch pipes respectively provided with a first pressure regulating valve 32 and a second pressure regulating valve 33, and the two branch pipes are respectively connected with the. The air distribution pipeline 3 supplies air for the inner spray gun 1 and the outer spray gun 2 respectively, the inner spray gun uses the original paint spraying principle, on the basis, the outer spray gun 2 also sprays a circular airflow which wraps the inner core paint mist, and the circular airflow also spirally advances, so that the possibility of being collided and scattered when the front air is broken is reduced, in the using process, the circular airflow wraps the inner core paint mist and spirally advances to enable all the paint to reach a spraying surface, in addition, the circular airflow wraps the paint column, so when the spraying device horizontally moves to spray a horizontal surface, the circular airflow column is firstly contacted with the spraying surface, the cleaning effect is achieved, and the surface is firstly blown; furthermore, the paint is diluted in advance when in use, namely, a high-concentration paint stock solution and a diluting solvent are mixed into a spraying solution with a desired proportion and then sprayed on the surface of a vehicle body, the diluting agent often contains more volatile components, the paint is volatilized and dried after being sprayed to obtain a final paint surface, because the paint contains more volatile components, the liquid volatilization is caused because the partial pressure of the components near the surface of the liquid does not reach the saturated vapor pressure of the components, the components can volatilize faster by reducing the environmental pressure, the pressure is reduced in various ways, the flow rate is increased to be one of the modes, the oil gas column can be quickly vaporized on the annular interface of two layers of air flows after being sprayed from the inner spray pipe 15, more paint solvent components are mixed into the annular air flow, and the inner core paint mist has a larger absolute speed standard value because of spiral advancing, therefore, a large amount of solvent is vaporized into a gaseous state in the inner core paint mist, the vaporization process is generated along with the speed increase of the whole oil-gas column, and the gas is separated out in no sequence, so the atomization effect is greatly superior to that of the traditional nozzle type mechanical atomization method, after the oil mist impacts a spraying surface, the speed is rapidly reduced, the pressure is increased, the solvent components are liquefied again, the vaporization process absorbs partial heat from the surrounding air on an advancing path, and the heat is released in the liquefaction process of the surface of a vehicle body at the moment of spraying, so that the slight heating effect is realized on the spraying surface, and the wettability is better; the solvent vaporized near the interface is mixed into the outer ring air after much of the solvent is vaporized because the concentration of the components on the outer ring outer air ring of the outer ring is low, as shown in fig. 6, outside the spray area, there is an annular area, which corresponds to the annular air column, in the path of travel of the spray device, the non-sprayed areas are first purged and then some of the solvent component is liquefied upon striking the surface to be sprayed, as a wetted substrate for the incoming developed paint, and for the area which is sprayed, a solvent layer can be plated on the color development paint layer to be used as a covering of the color development component in the paint, although volatile over time, may serve the purpose of protecting the paint color developing components during the spraying process and, according to this purpose, in the formulation of spray paints, a greater proportion of solvent component should be placed, at least five to ten percent higher than the proportion of components conventionally sprayed.

The inner and

outer nozzles

15, 22 are conical with the cone tips facing outwards. Because each medium can be spirally dispersed after being sprayed from the inner spray pipe and the outer spray pipe, in order to reduce the spiral dispersion effect, the mediums are firstly folded towards the spiral center line in the spraying device, and the distance between the end part of each spray pipe and the spraying surface is controlled according to the spraying area.

The outer nozzle 22 is detachably connected to the gun housing 21, and the inner nozzle 15 is detachably connected to the inner nozzle 14. The detachable connection is convenient for assembling and replacing the spray pipe.

The outer wall of the inner nozzle 15 is also provided with an external thread 152, and the external thread 152 and the shell thread 221 have the same rotating direction. The region between the outer wall of the inner nozzle 15 and the inner wall of the outer nozzle 22 is the position where the annular airflow spirals, and the outer wall of the inner nozzle 15 is also provided with an external thread to allow the spiral to occur more fully.

The thread specifications of the shell thread 221 and the external thread 152 differ by 2-3 specifications. The specification refers to the thread major diameter numerical values of the first specification series in the standard thread list, and the difference is 2-3 specifications, so that the passing clearance of the outer ring airflow is kept at a small degree, and the spiral is fully generated.

The external thread 152 and the internal thread 151 are threaded in opposite directions. The spiral direction of the outer ring airflow column is opposite to the spiral direction of the inner core paint mist, the outer ring area is completely gaseous components, the inner core part is in a gas-liquid mixed state, obvious shearing force can be caused at the interface, the passing resistance is increased, one is to prevent liquid components in the inner core paint mist from diffusing into the outer ring layer, and the liquid components in the inner core paint mist are color development components in the paint.

The pitch diameter ratio of the external thread 152 is larger than that of the internal thread 151, and the pressure reduction width of the first pressure regulating valve 32 is larger than that of the second pressure regulating valve 33. The pitch diameter ratio determines the ratio of the advancing speed of the medium column sprayed out by the spray pipe to the spiral speed, the larger the pitch diameter ratio, the larger the ratio of the advancing speed to the spiral speed, therefore, the outer annular airflow with the larger pitch diameter ratio has the larger advancing speed, and the higher pressure gas enters the outer spray gun 2 by matching with the second pressure regulating valve 33, so that the airflow speed at the spraying position of the outer spray pipe 22 is higher, the inner core paint mist is wrapped by the outer annular airflow with the larger speed, so that the solvent components penetrating through the inner and outer layer interfaces in the inner core paint mist can all impact the spraying surface, if the speed relationship is opposite, namely the advancing speed of the outer annular airflow is smaller than that of the inner core paint mist, some solvent components can be retained in the outer annular airflow, and the purging and wetting effects on the surface to be sprayed are remarkably reduced and delayed.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a spraying device of car finish homogenization fog liquid which characterized in that: the spraying device comprises an inner spray gun (1), wherein the inner spray gun (1) comprises an air passage handle (11), a tank connector (12), a paint tank (13), an inner spray nozzle (14) and an inner spray pipe (15), one end of the air passage handle (11) is connected with a pressure air source and one end of the inner spray nozzle (14), the end part side wall of one end of the inner spray nozzle (14) is connected with the air passage handle (11) through the tank connector (12) to form a paint tank (13), the spray end of the inner spray nozzle (14) is connected with the inner spray pipe (15), and the inner spray pipe (15) is provided with an inner thread (151) on the inner wall.

2. The device of claim 1, wherein the device comprises: the spraying device still includes outer spray gun (2), outer spray gun (2) are including rifle body shell (21) and outer spray tube (22), outer spray tube (22) is connected to rifle body shell (21) one end connection pressure air supply, one end, rifle body shell (21) still wraps up gas circuit handle (11) as the casing, spray tube (15) in outer spray tube (22) parcel, be equipped with shell screw thread (221) on outer spray tube (22) inner wall, the spraying device still includes distribution pipeline (3), distribution pipeline (3) include a house steward and two branch pipes that set up first air-vent valve (32) and second air-vent valve (33) respectively that are equipped with main valve (31), and gas circuit handle (11) and rifle body shell (21) are connected respectively to two branch pipes.

3. The device of claim 2, wherein the device comprises: the inner spray pipe (15) and the outer spray pipe (22) are conical, and the conical tips face outwards.

4. The device of claim 2, wherein the device comprises: the outer spray pipe (22) and the gun shell (21) are detachably connected, and the inner spray pipe (15) and the inner spray nozzle (14) are detachably connected. (the detachable connection is convenient for assembling and replacing the spray pipe).

5. The device of claim 2, wherein the device comprises: the outer wall of the inner spray pipe (15) is further provided with an external thread (152), and the external thread (152) and the shell thread (221) have the same rotating direction.

6. The device of claim 5, wherein the device comprises: the thread specifications of the shell thread (221) and the external thread (152) are different by 2-3 specifications. The specification refers to the thread major diameter numerical values of the first specification series in the standard thread list, and the difference is 2-3 specifications, so that the passing clearance of the outer ring airflow is kept at a small degree, and the spiral is fully generated.

7. The device of claim 5, wherein the device comprises: the screw direction of the external thread (152) is opposite to that of the internal thread (151).

8. The device of claim 7, wherein the device is characterized by comprising: the pitch diameter ratio of the external thread (152) is larger than that of the internal thread (151), and the pressure reduction amplitude of the first pressure regulating valve (32) is larger than that of the second pressure regulating valve (33).