Ultrasonic cleaning machine for piston and cleaning method

文档序号:1929198 发布日期:2021-12-07 浏览:26次 中文

阅读说明:本技术 一种活塞用超声清洗机及清洗方法 (Ultrasonic cleaning machine for piston and cleaning method ) 是由 王玉 杨波阳 黄茂彪 于 2021-09-30 设计创作,主要内容包括:本发明提供一种活塞用超声清洗机及清洗方法,涉及活塞清洗技术领域。该塞用超声清洗机包括上料台(1)、清洗台(2)、下料台(3)、设备箱(4)、超声波预洗槽(9)、超声波精洗槽(10)、高温漂洗槽(11)、切水槽(12)和烘干槽(13)和提拉输送机构(25)等结构,该活塞清洗方法包括上料、预洗、精洗、漂洗、压缩空气切水、热风循环烘干和下料等清洗流程,使用本发明提供的活塞用超声清洗机及清洗方法,清洗期间无须人力劳动,且清洗效果有保障,物料无损伤,环境无破坏。解决了现有活塞清洗不彻底、清洗过程自动化低、清洗效率低的技术问题。(The invention provides an ultrasonic cleaning machine for a piston and a cleaning method, and relates to the technical field of piston cleaning. The ultrasonic cleaning machine for the piston comprises a feeding table (1), a cleaning table (2), a discharging table (3), an equipment box (4), an ultrasonic prewashing tank (9), an ultrasonic fine cleaning tank (10), a high-temperature rinsing tank (11), a water cutting tank (12), a drying tank (13), a lifting conveying mechanism (25) and the like. The technical problems that the existing piston is not thoroughly cleaned, the cleaning process is low in automation and the cleaning efficiency is low are solved.)

1. The utility model provides an ultrasonic cleaning machine for piston which characterized in that: including material loading platform (1), clean bench (2), unloading platform (3), equipment box (4) and carry and draw conveying mechanism (25), wherein:

the feeding table (1), the cleaning table (2) and the discharging table (3) are spliced into an n shape, and the cleaning table (2) is vertically arranged between the feeding table (1) and the discharging table (3) and connected with the feeding table (1) and the discharging table (3);

a cleaning outer cover (18) is arranged above the cleaning table (2); an equipment box (4) is arranged on the side of the cleaning table (2);

a plurality of conveying rollers (5) and roller way chain wheels (6) are arranged on the feeding platform (1) and the discharging platform (3);

the cleaning table (2) is sequentially provided with an ultrasonic prewashing tank (9), an ultrasonic fine washing tank (10), a high-temperature rinsing tank (11), a water cutting tank (12) and a drying tank (13) along the direction from the feeding table (1) to the discharging table (3);

the ultrasonic pre-washing tank (9), the ultrasonic fine washing tank (10) and the high-temperature rinsing tank (11) respectively comprise a liquid storage tank, an electromagnetic valve, a concentration meter, an ultrasonic vibrator (15) and a heating device (14);

an air source device (16) is arranged on the wall of the water cutting tank (12);

the lifting and conveying mechanism (25) is hung on the inner wall of the top of the cleaning outer cover (18) and is positioned above the cleaning table (2);

a plurality of hooks (26) are arranged at the bottom of the lifting and conveying mechanism (25);

the top of the cleaning outer cover (18) is provided with an exhaust hole, the exhaust hole is connected with an oil mist collecting pipeline (20), the oil mist collecting pipeline (20) is connected with an oil mist collector (19), and the oil mist collector (19) is fixedly arranged at the top of the equipment box (4);

a circulating pump (21), a filter (22), an air heater (23), an air cylinder (24) and an electric control cabinet (27) are arranged in the equipment box (4);

the circulating pump (21) and the filter (22) are respectively communicated with the ultrasonic prewashing tank (9), the ultrasonic fine washing tank (10) and the high-temperature rinsing tank (11) through pipelines;

the hot air blower (23) and the air cylinder (24) are communicated with the drying groove (13);

the electric control cabinet (27) is electrically connected with the conveying roller driving motor (8), the heating device (14), the ultrasonic vibrator (15), the electromagnetic valve, the air source device (16), the oil mist collector (19), the circulating pump (21), the filter (22), the hot air blower (23), the air cylinder (24) and the lifting and conveying mechanism (25).

2. The ultrasonic cleaning machine for the piston as set forth in claim 1, wherein: each roller way chain wheel (6) is connected with a conveying roller driving motor (8) through a chain (7) and driven by the conveying roller driving motor (8); and the conveying roller driving motor (8) is respectively arranged in the feeding platform (1) and the discharging platform (3).

3. The ultrasonic cleaning machine for the piston as set forth in claim 1, wherein: the heating device (14) is arranged on the bottom and the four walls of the liquid storage tank.

4. The ultrasonic cleaning machine for the piston as set forth in claim 1, wherein: the lifting and conveying mechanism (16) comprises a translation gear rack and a chain lifting device.

5. The ultrasonic cleaning machine for the piston as set forth in claim 1, wherein: the cleaning outer cover (18) is composed of a plurality of stainless steel pieces, and an observation window made of transparent materials is further arranged on the cleaning outer cover (18).

6. The ultrasonic cleaning machine for the piston as set forth in claim 1, wherein: the bottom of the liquid storage tank is of a slope-shaped structure, a water outlet is formed in the slope bottom of the liquid storage tank, and a flange type slag removing device is arranged at the water outlet.

7. A piston cleaning method based on the ultrasonic cleaning machine for piston as claimed in claims 1-6,

the method is characterized in that: the method comprises the following steps:

s1, feeding, comprising the following steps:

s11, loading the material to be cleaned into a material frame (17);

s12, placing the material frame (17) on a conveying roller (5) of a feeding table (1) to enable the materials in the material frame (17) to be sequentially conveyed into a cleaning outer cover (18), and hanging the material frame (17) on a hook (26);

s2, ultrasonic prewashing: the materials enter an ultrasonic prewashing tank (9), and are soaked and washed in a cleaning agent solution at the temperature of 30-35 ℃ for 3-10 min, wherein the ultrasonic output power is 1-2 kw;

s3, ultrasonic fine washing: the materials enter an ultrasonic fine washing tank (10), and are soaked and washed in pure water at the temperature of 35-40 ℃ for 1-5 min, wherein the ultrasonic output power is 1-2 kw;

s4, high-temperature rinsing: the materials enter a high-temperature rinsing tank (11), and are soaked and washed in pure water at the temperature of 45-50 ℃ for 1-5 min, and the ultrasonic output power is 1-2 kw;

s5, compressed air water cutting: the material enters a water cutting groove (12), an air source device (16) sprays compressed air to the material to cut water, the temperature of the compressed air is 50-55 ℃, and the water cutting time is 25-35 seconds;

s6, drying the materials in a hot air circulation mode, wherein the materials enter a drying groove (13), the drying temperature is 55-85 ℃, and the drying time is 200-250 seconds;

s7, blanking: the lifting conveying mechanism (25) conveys the materials to the blanking table (3), and the materials are conveyed out by the conveying roller (5).

8. A piston cleaning method according to claim 7, wherein: and the cleaning agent solution in the step S2 is 5-6% of NC130 cleaning agent.

Technical Field

The invention relates to the technical field of piston cleaning, in particular to an ultrasonic cleaning machine for a piston and a cleaning method.

Background

With the improvement of the consumption level in China, the automobile industry in China is greatly developed. The automobile industry suffers from less severe tests in recent years, and the internal and external development environments are fallen and fluctuated, which all cause certain impact on the domestic automobile industry. Nevertheless, the automotive industry has kept some growth, but the increase has slowed significantly over the last few years. Therefore, each enterprise needs to improve its production technology, so that the market is competitive.

In an automobile engine, a piston is an important part which reciprocates in the automobile engine. The primary function of the piston is to withstand the combustion pressures in the cylinder and to transfer this force to the crankshaft via the piston pin and connecting rod to power the engine. In the piston machining process, the surface of the piston contains oil stains and scrap iron, and most automobile enterprises clean the piston manually. There is therefore a need in the market for an apparatus that can replace manual piston cleaning.

In patent CN201510862097.1, a piston washing line is disclosed, which comprises a fixed plate, the deciding material device is installed to the left part of fixed plate, and belt cleaning device is installed to the right part of fixed plate, and the upper end of fixed plate is fixed with a support frame, is equipped with the sliding plate on the support frame, and a cylinder is all installed in preceding, the back two of sliding plate, and No. two cylinders are installed to the right-hand member of a support frame, and the below of sliding plate is equipped with the link No. one, and the left end of link is fixed with clamping device. This patent has advantages such as structural design is reasonable, convenient to use, has realized the self-cleaning of piston, has improved the cleaning efficiency of piston, has practiced thrift manufacturing cost to utilize the device of deciding the material to realize the automatic feeding of piston, degree of automation is high, has saved manpower and materials, has improved production efficiency.

In patent No. cn202110528023.x, a piston pin cleaning device is disclosed, which relates to a piston pin cleaning device, and comprises a cleaning tank, wherein a cross beam is transversely installed in the cleaning tank, a cleaning box is fixed on the cross beam, the cleaning box comprises a box bottom and a box cover, the box bottom and the box cover are detachably connected, a plurality of accommodating grooves for accommodating a piece to be cleaned are arranged on the top surface of the box bottom in the vertical direction, a plurality of first through holes are arranged on the bottom surface of the box bottom, the first through holes are arranged in one-to-one correspondence with the accommodating grooves and communicated with the corresponding accommodating grooves, a plurality of second through holes are arranged on the box cover, and the second through holes are arranged in one-to-one correspondence with the accommodating grooves and communicated with the corresponding accommodating grooves; and an air supply structure for supplying air to the middle hole of the piece to be cleaned is arranged in the cleaning tank. The piston pin cleaning device provided by the patent improves the cleaning effect of the piston pin middle hole.

In patent CN201610738199.7, a piston ring wiper mechanism is disclosed, including the purge chamber, leading-in cleaning line in the purge chamber, cleaning line one end is connected on the feed inlet, the cleaning line other end is connected on the discharge gate, cleaning line lower extreme installation conveying roller machine, install high-pressure spray cleaning device on cleaning line front end and the rear end both sides terminal surface, cleaning line central authorities are equipped with many sides wiper mechanism, the piston ring is installed in the many sides wiper mechanism outside and is got a robot, many sides wiper mechanism front end is equipped with the piston ring and gets a room, a drainage room is still installed to the discharge gate front end, the drainage room outside is installed the piston ring and is got a upset drainage robot. In this way, this patent can carry out washing in succession to the piston ring, and wiper mechanism is equipped with intelligent robot and picks the washing and strain the drainage processing, improves the cleaning efficiency, and wiper mechanism is intelligent automatic more.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an ultrasonic cleaning machine for a piston and a cleaning method. The technical problems that the existing piston is not thoroughly cleaned, the cleaning process is low in automation and the cleaning efficiency is low are solved.

The purpose of the invention is realized by the following technical scheme:

the utility model provides an ultrasonic cleaning machine for piston, includes material loading platform, clean bench, unloading platform, equipment box and draws conveying mechanism, wherein:

the feeding table, the cleaning table and the discharging table are spliced into an n shape, and the cleaning table is vertically arranged between the feeding table and the discharging table and connected with the feeding table and the discharging table;

a cleaning outer cover is arranged above the cleaning table;

an equipment box is arranged on the side of the cleaning table;

a plurality of conveying rollers and roller way chain wheels are arranged on the feeding table and the discharging table;

the cleaning table is sequentially provided with an ultrasonic pre-washing tank, an ultrasonic fine-washing tank, a high-temperature rinsing tank, a water cutting tank and a drying tank along the direction from the feeding table to the discharging table;

the ultrasonic pre-washing tank, the ultrasonic fine washing tank and the high-temperature rinsing tank respectively comprise a liquid storage tank, an electromagnetic valve, a concentration meter, an ultrasonic vibrator and a heating device;

an air source device is arranged on the wall of the water cutting groove;

the lifting conveying mechanism is hung on the inner wall of the top of the cleaning outer cover and is positioned above the cleaning table;

the bottom of the lifting and conveying mechanism is provided with a plurality of hooks;

the top of the cleaning outer cover is provided with an exhaust hole, the exhaust hole is connected with an oil mist collecting pipeline, the oil mist collecting pipeline is connected with an oil mist collector, and the oil mist collector is fixedly arranged at the top of the equipment box;

a circulating pump, a filter, an air heater, an air cylinder and an electrical control cabinet are arranged in the equipment box;

the circulating pump and the filter are respectively communicated with the ultrasonic pre-washing tank, the ultrasonic fine washing tank and the high-temperature rinsing tank through pipelines;

the hot air blower and the air cylinder are communicated with the drying groove;

the electric control cabinet is electrically connected with the conveying roller driving motor, the heating device, the ultrasonic vibrator, the electromagnetic valve, the air source device, the oil mist collector, the circulating pump, the filter, the air heater, the air cylinder and the lifting and conveying mechanism.

Optionally or preferably, each roller way chain wheel is connected with a conveying roller driving motor through a chain and driven by the conveying roller driving motor.

Alternatively or preferably, the conveying roller driving motors are respectively installed inside the feeding table and the discharging table (3).

Alternatively or preferably, the heating means is provided on the bottom and the four walls of the reservoir.

Alternatively or preferably, the lift conveyor mechanism comprises a translating rack and pinion and a chain hoist.

Optionally or preferably, the cleaning housing is made of a plurality of pieces of stainless steel, and an observation window made of transparent materials is further arranged on the cleaning housing.

Optionally or preferably, the bottom of the liquid storage tank is of a slope-shaped structure, a water outlet is formed in the slope bottom of the liquid storage tank, and a flange type slag removing device is arranged at the water outlet.

Optionally or preferably, the invention adopts a PLC controller of Mitsubishi, an ohm dragon electric appliance element and a Willen touch screen man-machine operation exchange system to control the whole operation process, and the whole operation process can be fully automatically operated or manually operated.

Based on the technical scheme, the following technical effects can be generated:

the invention has high automation degree, can seamlessly connect cleaning processes of feeding, prewashing, fine washing, rinsing, compressed air water cutting, hot air circulation drying, blanking and the like, does not need manpower labor during cleaning, has guaranteed cleaning effect, does not damage materials and does not damage the environment. The technical problems that the existing piston is not thoroughly cleaned, the cleaning process is low in automation and the cleaning efficiency is low are solved.

The invention also provides a piston cleaning method based on the ultrasonic cleaning machine for the piston, which comprises the following steps of:

s1, feeding, comprising the following steps:

s11, loading the material to be cleaned into a material frame;

s12, placing the material frame on a conveying roller of a feeding table, so that the materials in the material frame are sequentially conveyed into a cleaning outer cover, and the material frame is hung on a hook;

s2, ultrasonic prewashing: the materials enter an ultrasonic prewashing tank, and are soaked and washed in a cleaning agent solution at the temperature of 30-35 ℃ for 3-10 min, wherein the ultrasonic output power is 1-2 kw;

s3, ultrasonic fine washing: the materials enter an ultrasonic wave fine washing tank, and are soaked and washed in pure water at the temperature of 35-40 ℃ for 1-5 min, and the ultrasonic output power is 1-2 kw;

s4, high-temperature rinsing: putting the material into a high-temperature rinsing tank, and soaking and washing the material in pure water at the temperature of 45-50 ℃ for 1-5 min, wherein the ultrasonic output power is 1-2 kw;

s5, compressed air water cutting: the method comprises the following steps that materials enter a water cutting groove, an air source device sprays compressed air to the materials to cut water, the temperature of the compressed air is 50-55 ℃, and the water cutting time is 25-35 seconds;

s6, drying the materials in a hot air circulation mode, wherein the materials enter a drying groove, the drying temperature is 55-85 ℃, and the drying time is 200-250 seconds;

s7, blanking: the lifting conveying mechanism conveys the materials to the discharging platform, and the materials are conveyed out by the conveying rollers.

Optionally or preferably, the detergent solution in the step S2 is 5-6% of NC130 detergent.

The piston cleaning method provided by the invention can be used for seamlessly connecting cleaning processes of feeding, prewashing, fine cleaning, rinsing, compressed air water cutting, hot air circulation drying, blanking and the like, and the cleaning process does not need manual labor, the cleaning effect is guaranteed, the materials are not damaged, and the environment is not damaged. The piston surface after the cleaning is finished has no oil stain and brown oxidation spots, keeps silvery luster, and solves the technical problems of incomplete cleaning, low automation of the cleaning process and low cleaning efficiency of the existing piston.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural view (front view) of the present invention;

FIG. 2 is a schematic structural view (left side view) of the present invention;

FIG. 3 is a schematic structural view (top view) of the present invention;

in the figure: 1-feeding table, 2-cleaning table, 3-discharging table, 4-equipment box, 5-conveying roller, 6-roller chain wheel, 7-chain, 8-conveying roller driving motor, 9-ultrasonic pre-washing tank, 10-ultrasonic fine washing tank, 11-high-temperature rinsing tank, 12-water cutting tank, 13-drying tank, 14-heating device, 15-ultrasonic vibrator, 16-air source device, 17-material frame, 18-cleaning housing, 19-oil mist collector, 20-oil mist collecting pipeline, 21-circulating pump, 22-filter, 23-hot air blower, 24-air cylinder, 25-lifting conveying mechanism, 26-hook and 27-electrical control cabinet.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

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.

Example 1:

as shown in fig. 1-3:

the invention provides an ultrasonic cleaning machine for pistons, which comprises a feeding table 1, a cleaning table 2, a discharging table 3, an equipment box 4 and a lifting and conveying mechanism 25, wherein:

the feeding table 1, the cleaning table 2 and the discharging table 3 are spliced into an n shape;

the cleaning table 2 is vertically arranged between the feeding table 1 and the discharging table 3 and is connected with the feeding table 1 and the discharging table 3;

a cleaning outer cover 18 is arranged above the cleaning table 2;

an equipment box 4 is arranged on the side of the cleaning table 2;

a plurality of conveying rollers 5 and roller way chain wheels 6 are arranged on the feeding platform 1 and the discharging platform 3;

the cleaning table 2 is sequentially provided with an ultrasonic prewashing tank 9, an ultrasonic fine cleaning tank 10, a high-temperature rinsing tank 11, a water cutting tank 12 and a drying tank 13 along the direction from the feeding table 1 to the discharging table 3;

the ultrasonic pre-washing tank 9, the ultrasonic fine washing tank 10 and the high-temperature rinsing tank 11 respectively comprise a liquid storage tank, an electromagnetic valve, a concentration meter, an ultrasonic vibrator 15 and a heating device 14;

an air source device 16 is arranged on the wall of the water cutting tank 12;

the lifting conveying mechanism 25 is hung on the inner wall of the top of the cleaning outer cover 18 and is positioned above the cleaning table 2;

the bottom of the lifting and conveying mechanism 25 is provided with a plurality of hooks 26;

the top of the cleaning outer cover 18 is provided with an exhaust hole which is connected with an oil mist collecting pipeline 20;

the oil mist collecting pipeline 20 is connected with the oil mist collector 19;

the oil mist collector 19 is fixedly arranged at the top of the equipment box 4;

a circulating pump 21, a filter 22, an air heater 23, an air cylinder 24 and an electric control cabinet 27 are arranged in the equipment box 4;

the circulating pump 21 and the filter 22 are respectively communicated with the ultrasonic prewashing tank 9, the ultrasonic fine washing tank 10 and the high-temperature rinsing tank 11 through pipelines;

the hot air blower 23 and the air cylinder 24 are communicated with the drying groove 13;

the electric control cabinet 27 is electrically connected with the conveying roller driving motor 8, the heating device 14, the ultrasonic vibrator 15, the electromagnetic valve, the air source device 16, the oil mist collector 19, the circulating pump 21, the filter 22, the hot air blower 23, the air cylinder 24 and the lifting and conveying mechanism 25.

In this embodiment, every roller table sprocket 6 all links to each other with transfer roller driving motor 8 through chain 7, is driven by transfer roller driving motor 8.

In this embodiment, the conveying roller driving motor 8 is installed inside the feeding stage 1 and the discharging stage 3, respectively.

In this embodiment, the heating means 14 are provided on the bottom and the four walls of the reservoir.

In this embodiment, the pull conveyor 16 includes a translating rack and pinion and a chain hoist.

In this embodiment, the cleaning cover 18 is made of a plurality of stainless steels, and the cleaning cover 18 is further provided with an observation window made of a transparent material.

In this embodiment, the bottom of the liquid storage tank is of a slope-shaped structure, a water outlet is formed in the slope bottom of the liquid storage tank, and a flange type slag removing device is arranged at the water outlet.

The ultrasonic cleaning machine for the piston has the following advantages:

the automatic washing machine has the advantages that the automation degree is high, washing processes such as feeding, prewashing, fine washing, rinsing, compressed air water cutting, hot air circulation drying and discharging can be connected seamlessly, manual labor is not needed during washing, the washing effect is guaranteed, materials are not damaged, and the environment is not damaged. Solves the technical problems of incomplete cleaning of the existing piston, low automation of the cleaning process and low cleaning efficiency

The embodiment also provides a piston cleaning method based on the embodiment 1 of the ultrasonic cleaning machine for the piston, which comprises the following steps:

s1, feeding, comprising the following steps:

s11, loading the material to be cleaned into the material frame 17;

s12, placing the material frame 17 on the conveying roller 5 of the feeding table 1, so that the materials in the material frame 17 are sequentially conveyed into the cleaning outer cover 18, and the material frame 17 is hung on the hook 26;

s2, ultrasonic prewashing: the materials enter an ultrasonic prewashing tank 9, and are soaked and washed in a cleaning agent solution at the temperature of 30-35 ℃ for 3-10 min, wherein the ultrasonic output power is 1-2 kw;

s3, ultrasonic fine washing: the materials enter an ultrasonic wave fine washing tank 10, and are soaked and washed in pure water at the temperature of 35-40 ℃ for 1-5 min, and the ultrasonic output power is 1-2 kw;

s4, high-temperature rinsing: the materials enter a high-temperature rinsing tank 11, and are soaked and washed in pure water at the temperature of 45-50 ℃ for 1-5 min, and the ultrasonic output power is 1-2 kw;

s5, compressed air water cutting: the material enters a water cutting groove 12, a gas source device 16 sprays compressed air to the material to cut water, the temperature of the compressed air is 50-55 ℃, and the water cutting time is 25-35 seconds;

s6, drying the materials in a hot air circulation mode, wherein the materials enter the drying groove 13, the drying temperature is 55-85 ℃, and the drying time is 200-250 seconds;

s7, blanking: the lifting and conveying mechanism 25 conveys the materials to the blanking table 3, and the materials are conveyed out by the conveying rollers 5.

In this embodiment, the detergent solution in step S2 is 5-6% of NC130 detergent.

The piston cleaning method provided by the embodiment has the following advantages:

the cleaning machine can be seamlessly connected with cleaning processes such as feeding, prewashing, fine cleaning, rinsing, compressed air water cutting, hot air circulation drying, blanking and the like, manual labor is not needed during cleaning, the cleaning effect is guaranteed, materials are not damaged, and the environment is not damaged. The piston surface after the cleaning is finished has no oil stain and brown oxidation spots, keeps silvery luster, and solves the technical problems of incomplete cleaning, low automation of the cleaning process and low cleaning efficiency of the existing piston.

The structures, functions, and connections disclosed herein may be implemented in other ways. For example, the embodiments described above are merely illustrative, e.g. the oil mist collector may have other mounting arrangements, e.g. a plurality of components may be combined or integrated with one another; in addition, each functional component in the embodiments herein may be integrated into one functional component, or each functional component may exist alone physically, or two or more functional components may be integrated into one functional component.

The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

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