CN115555209A

CN115555209A - Silver dipping method

Info

Publication number: CN115555209A
Application number: CN202211292406.2A
Authority: CN
Inventors: 訾秋杰
Original assignee: Dongguan Fengji Intelligent Technology Co ltd
Current assignee: Dongguan Fengji Intelligent Technology Co ltd
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2023-01-03
Also published as: CN116213182A

Abstract

The invention discloses a silver dipping method for solving the problem of low production efficiency of silver dipping products in the field of electronic element production equipment, which comprises the following steps: adding materials, namely adding coating liquid into a material groove, and putting a product to be stained with silver into a feeding mechanism; conveying, wherein the feeding mechanism sends the product to a rotating wheel, the magnetic wheel enables the product to be adsorbed on the rotating wheel, a first power part drives a feeding roller to rotate, and coating liquid in a trough is adhered to the surface of the feeding roller; coating, namely synchronously rotating a rotating wheel and a feeding roller, contacting the surface of a product on the rotating wheel with coating liquid on the feeding roller, and coating the coating liquid on the feeding roller on the surface of the product; and discharging the product, wherein the discharging mechanism discharges the product out of the rotating wheel.

Description

Silver dipping method

Technical Field

The invention relates to the technical field of electronic element production equipment, in particular to a silver dipping method.

Background

The existing method for sticking the silver on the surface of the chip usually comprises the steps of arranging a plurality of products on a plate-type jig, moving the jig to contact with a trough for placing silver materials through a mechanical arm, enabling the products to contact with the silver materials, adhering the silver materials on the surface of the products, and carrying out mass production on the products in the transportation mode.

Disclosure of Invention

The invention provides a silver dipping method, which aims to solve at least one technical problem in the prior art.

The technical scheme of the invention is a silver dipping method applied to a silver dipping machine, wherein the silver dipping machine comprises the following steps:

a support;

the conveying mechanism comprises a magnetic wheel, a rotating wheel and a second power piece, the rotating wheel is rotatably arranged on the support and provided with an inner cavity, the magnetic wheel is arranged in the inner cavity, a notch is formed in the outer wall of the magnetic wheel, and the second power piece is connected with the rotating wheel and drives the rotating wheel to rotate relative to the magnetic wheel;

the liquid coating mechanism comprises a trough, a feeding roller and a first power part, wherein the trough is used for storing coating liquid, the feeding roller is rotatably arranged on the support, the first power part is connected with the feeding roller, and the first power part is used for driving the feeding roller to rotate and coating the coating liquid in the trough on a product;

the feeding mechanism is arranged on the bracket and used for conveying products to the rotating wheels;

the blanking mechanism is arranged at the notch and used for conveying the product out of the rotating wheel;

the silver dipping method comprises the following steps:

adding materials, namely adding coating liquid into a material groove, and putting a product to be stained with silver into a feeding mechanism;

conveying, wherein the feeding mechanism sends the product to the rotating wheel, the magnetic wheel enables the product to be adsorbed on the rotating wheel, the first power part drives the feeding roller to rotate, and the coating liquid in the material groove is adhered to the surface of the feeding roller;

coating, namely synchronously rotating a rotating wheel and a feeding roller, contacting the surface of a product on the rotating wheel with coating liquid on the feeding roller, and coating the coating liquid on the surface of the product by the feeding roller;

and discharging the product, wherein the blanking mechanism discharges the product out of the rotating wheel.

Furthermore, feed mechanism includes the vibrations dish, puts into the vibrations dish with waiting to be stained with the product of silver, and the vibrations dish is neat with mixed and disorderly product arrangement to transport neat product one by one and take turns to.

Furthermore, the material tank is provided with a feed inlet, and coating liquid is added into the feed inlet.

The product sorting device is characterized by further comprising a limiting plate, the limiting plate is arranged on the support, a limiting gap is formed between the limiting plate and the rotating wheel, and after the rotating wheel moves the product to the limiting gap, the limiting plate sorts the product to the same height.

Furthermore, a scraping plate is arranged on the feeding roller and can scrape redundant coating liquid on the feeding roller, so that the thickness of the coating liquid on the feeding roller is kept consistent.

Furthermore, the rotating linear speed of the rotating wheel is the same as that of the feeding roller, and the rotating direction of the rotating wheel is opposite to that of the feeding roller.

Furthermore, the blanking mechanism comprises a third power part and a first guide pipeline, and the third power part drives products on the rotating wheel to be discharged out of the rotating wheel along the first guide pipeline.

And further, the silver dipping machine further comprises a heating mechanism, and after the product is conveyed to the drying groove by the rotating wheel, the coating liquid is dried by the heating mechanism.

Further, heating mechanism includes drying bath and heating member, the heating member is installed on the drying bath, heating member heating drying bath, the product is along rotating the wheel conveying, and the product is along drying bath transportation.

Furthermore, the material groove is provided with a feed opening, and coating liquid is added into the material groove from the feed opening.

The beneficial effects of the invention are as follows.

1. The magnetism wheel is fixed on the support, it sets up in the magnetism wheel outside to rotate the wheel, it can take turns rotatoryly to rotate the wheel relative magnetism, product part structure is made by iron, the product is connected with magnetism wheel magnetism, make the product can adsorb on first orbital surface, along with rotating the motion of wheel, the product can arrange in proper order on first track, the product can be transported one by one and be stained with silver, the height of product on rotating the wheel keeps unanimous, the product stretches into the degree of depth of scribbling liquid the same, the scribbling liquid can not be stained with to all the other parts of product, improve and be stained with silver quality.

2. The outer wall of magnetism wheel is provided with the breach, rotates the wheel and is normal circular structure, and the outer wall of magnetism wheel breach position is far away relatively with the outer wall distance that rotates on the wheel corresponding position, makes the magnetism wheel adsorption affinity of breach position lower, and the product is easy and rotates the wheel separation, makes things convenient for the product transportation.

3. When the feeding roller rotates, the coating liquid can be adhered to the surface of the feeding roller, the first rail transports products, the transporting speed of the first rail is the same as the rotating linear speed of the feeding roller, the products pass through coating holes between the first rail and the feeding roller, the coating is in contact with the products, the coating is adhered to the surfaces of the products, the coating liquid is coated on the products one by one, and the silver dipping effect is good.

4. The whole process can be completed without other operations as long as the operations of putting products and adding coating liquid are processed, and the silver dipping efficiency is effectively improved.

Drawings

FIG. 1 is a general block diagram of a silver applicator according to an embodiment of the present invention;

FIG. 2 is a front view of a silver-dipping machine according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a silver-dipping machine according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of a conveying mechanism according to an embodiment of the present invention;

FIG. 5 is a schematic view of the transport mechanism of FIG. 3 with the rotating wheels removed;

FIG. 6 is a schematic structural view of a magnetic wheel according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a liquid applying mechanism according to an embodiment of the invention;

fig. 8 is a schematic structural view of a heating mechanism according to an embodiment of the present invention.

Reference numerals:

a bracket 100;

a conveying mechanism 200, a magnetic wheel 210, a notch 211 and a rotating wheel 220;

the coating device comprises a liquid coating mechanism 300, a trough 310, a feeding roller 320, a scraping plate 330 and a coating wheel 340;

a feeding mechanism 400, a vibration disc 410 and a steering conveyor belt 420;

a blanking mechanism 500;

a heating mechanism 600, a drying tank 610 and a heating member 620.

Detailed Description

The following description will describe several embodiments of the present invention, including embodiments corresponding to the accompanying drawings, it being understood that the drawings are for assisting understanding of technical features and technical solutions of the present invention, and should not be construed as limiting the scope of the present invention.

The conception, the specific structure and the technical effects of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the schemes and the effects of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that, unless otherwise specifically limited, when a feature is referred to as being "fixed," "connected," or "mounted" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature, and the terms "fixed," "connected," or "mounted" are used broadly, and those skilled in the art can reasonably determine the specific meaning of the above-mentioned words in the present invention by combining the details of the technical solutions.

It should be noted that the description of the orientation or positional relationship indicated by upper, lower, left, right, top, bottom, front, rear, inner, outer, etc. used in the present invention is based on the orientation or positional relationship of the drawings or embodiments, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

It should be noted that, as used herein, the term "and/or" includes any combination of one or more of the associated listed items, several means one or more, several means two or more, greater than, less than, exceeding, etc. are understood not to include the essential numbers, and greater than, less than, etc. are understood to include the essential numbers.

It should be noted that, if the first and the second are described in the present invention, they are only used for distinguishing technical features, but they are not interpreted as indicating or implying relative importance or implying number of indicated technical features or implying precedence of indicated technical features.

It is to be understood that, unless otherwise specifically defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Note that the arrow in the cross-sectional view is reversed to the product conveying direction.

Referring to fig. 1 to 8, a silver dipping method according to an embodiment of the present invention is applied to a silver dipping machine,

the silver staining machine comprises:

a bracket 100;

the conveying mechanism 200 comprises a magnetic wheel 210, a rotating wheel 220 and a second power piece, the rotating wheel 220 is rotatably arranged on the support 100, the rotating wheel 220 is provided with an inner cavity, the magnetic wheel 210 is arranged in the inner cavity, a notch 211 is arranged on the outer wall of the magnetic wheel 210, the second power piece is connected with the rotating wheel 220, and the second power piece drives the rotating wheel 220 to rotate relative to the magnetic wheel 210;

the liquid coating mechanism 300 comprises a trough 310, a feeding roller 320 and a first power part, wherein the trough 310 is used for storing coating liquid, the feeding roller 320 is rotatably arranged on the bracket 100, the first power part is connected with the feeding roller 320, and the first power part is used for driving the feeding roller 320 to rotate and coating the coating liquid in the trough 310 on a product;

a feeding mechanism 400 provided on the bracket 100, the feeding mechanism 400 being used to transport a product to the rotary wheel 220;

the blanking mechanism 500 is arranged at the notch 211, and the blanking mechanism 500 is used for conveying products out of the rotating wheel 220;

the silver dipping method comprises the following steps:

adding the coating liquid into the trough 310, and putting the product to be stained with silver into the feeding mechanism 400;

conveying, the feeding mechanism 400 sends the product to the rotating wheel 220, the magnetic wheel 210 enables the product to be adsorbed on the rotating wheel 220, the first power part drives the feeding roller 320 to rotate, and the coating liquid in the trough 310 is adhered to the surface of the feeding roller 320;

coating, wherein the rotating wheel 220 and the feeding roller 320 rotate synchronously, the surface of a product on the rotating wheel 220 is contacted with the coating liquid on the feeding roller 320, and the coating liquid on the feeding roller 320 is coated on the surface of the product;

the product is discharged and the discharging mechanism 500 discharges the product out of the rotating wheel 220.

The magnetic wheel 210 is fixed on the support 100, the magnetic wheel 210 is arranged in the inner cavity of the rotating wheel 220, the rotating wheel 220 can rotate relative to the magnetic wheel 210, and the product is magnetically connected with the magnetic wheel 210, so that the product can be adsorbed on the surface of the rotating wheel 220 and moves along with the rotating wheel 220, the product can be sequentially arranged on the rotating wheel 220, the product can be transported and stained with silver one by one, and the quality of staining with silver is improved; the outer wall of the magnetic wheel 210 is provided with a notch 211, the rotating wheel 220 is of a normal circular structure, the distance between the outer wall of the notch 211 of the magnetic wheel 210 and the outer wall of the corresponding position of the rotating wheel 220 is relatively far, so that the magnetic wheel 210 at the notch 211 is low in adsorption force, a product is easy to separate from the rotating wheel 220, and the product is convenient to transport; by rotating the feeding roller 320, the coating liquid can be continuously attached to the feeding roller 320, and the coating liquid can be continuously coated on a product by the aid of the common motion of the conveying mechanism 200 and the feeding roller 320; the whole process can be completed without other operations as long as the operations of putting products and adding coating liquid are processed, so that the silver dipping efficiency is effectively improved, and the labor cost is reduced.

It is understood that the product part structure is made of a material such as iron, nickel or cobalt that can be magnetically coupled to the magnetic wheel 210, so that the product can be attracted to the rotating wheel 220.

It can be understood that the first power member may be a motor disposed at an axial position of the rotating wheel 220, a connecting rod structure connected to an output end of the motor is disposed at a middle portion of the rotating wheel 220, and the motor is turned on to rotate the rotating wheel 220; the first power member may also be a driving wheel disposed outside the rotating wheel 220, the driving wheel is rotatably connected to the rotating wheel 220, the driving wheel is tangent to the rotating wheel 220, and the driving wheel drives the rotating wheel 220 to rotate relative to the magnetic wheel 210.

It is understood that the rotating wheel 220 may be fully enclosed or open, i.e. the inner cavity is completely disposed inside the rotating wheel 220, and the magnetic wheel 210 is installed in the inner cavity of the rotating wheel 220 without contacting with the external environment; in the open type, the rotating wheel 220 is provided with a through hole or a groove extending along the axial direction thereof in the axial direction, and the magnetic wheel 210 is mounted in the inner cavity of the rotating wheel 220 through the hole or the groove.

It is understood that the notch 211 of the magnetic wheel 210 has a circular cross section in the normal wheel-shaped structure, and the wheel-shaped structure with the notch 211 has a shape that a figure (such as a sector, a segment) is cut off from the circular edge.

It can be understood that the magnetic wheel 210 is a magnet or an electromagnet, the magnetic force of the outer wall of the magnetic wheel 210 is consistent, and the rotating wheel 220 is arranged between the product and the magnetic wheel 210, but the product can still be adsorbed on the rotating wheel 220.

In some embodiments, the feeding mechanism 400 includes a vibratory tray 410, and the products to be stained are placed in the vibratory tray 410, and the vibratory tray 410 aligns the disordered products and conveys the aligned products one by one onto the rotating wheel 220. After the products are placed in the vibration plate 410, the vibration plate 410 can sequentially feed the disordered products into the rotating wheel 220.

Further, the feeding mechanism 400 further includes a turning conveyor 420. Vibrations dish 410 can be with the orderly conveying of sending into of unordered product turn to conveyer belt 420, turns to conveyer belt 420 and sends into after adjusting the direction with orderly product and rotate wheel 220, rotates and has turn to conveyer belt 420 between wheel 220 and the vibration dish at the interval, prevents that vibrations of vibrations dish 410 from influencing the transportation of rotating wheel 220.

In some embodiments, the tank 310 is provided with a feed port from which coating solution is added to the tank 310. When the coating is below a certain level, the coating liquid is added through the feed opening, so that the coating liquid can be continuously attached to the feeding roller 320.

It will be appreciated that a position sensor is provided in the tank 310, which signals the addition of coating fluid from the feed port to the tank 310 when the coating falls below a certain level.

In some embodiments, the product sorting device further comprises a limiting plate, the limiting plate is disposed on the bracket 100, a limiting gap is disposed between the limiting plate and the rotating wheel 220, and after the rotating wheel 220 moves the product to the limiting gap, the limiting plate sorts the product to the same height. The height-limiting clearance is used for the product height, prevents that the product from piling up, dislocation the scheduling reason owing to the product in the transportation, and the height that leads to the product differs, and is different with the depth of contact of masking liquid, influences the masking liquid effect.

It can be understood that the limiting plate detachable mounting bracket 100 forms height limiting gaps with different widths by adjusting the position of the limiting plate to adapt to different products.

In some embodiments, the material scraping plate 330 is disposed on the material loading roller 320, and the material scraping plate 330 can scrape off the excessive coating liquid on the material loading roller 320, so that the thickness of the coating liquid on the material loading roller 320 is kept consistent. The scraping gap is arranged between the scraping plate 330 and the feeding roller 320, when coating liquid adhered to the feeding roller 320 passes through the limiting hole, the redundant coating liquid can be scraped by the scraping plate 330, the coating thickness is controlled, and the coating liquid quality is improved.

Further, the liquid applying mechanism 300 further comprises a coating wheel 340, at least a part of the structure of the coating wheel 340 is located in the trough 310, and the coating wheel 340 is connected with the feeding roller 320. The coating wheel 340 partially extends into the coating liquid to make the coating wheel 340 adhere with the coating liquid, and then the coating wheel 340 adheres the coating liquid onto the feeding roller 320.

It can be understood that the feeding roller 320 needs to have high precision, is not directly soaked in the trough 310, and is indirectly coated with the coating liquid through the coating wheel 340, so that the feeding roller 320 is prevented from being soaked in the trough 310 for a long time and the feeding roller 320 is prevented from being corroded.

In some embodiments, the rotational wheel 220 rotates at the same linear speed and in the opposite direction as the loading roller 320. The transport speed of the rotating wheel 220 is the same as the rotating linear speed of the feeding roller 320, the product passes through the coating gap between the rotating wheel 220 and the feeding roller 320, after the feeding roller 320 coats the coating on the product, the feeding roller 320 continues to rotate, the coating can be continuously supplemented onto the feeding roller 320, the thickness of the coating on the surface of the feeding roller 320 is kept consistent, and the silver coating quality is improved.

In some embodiments, the blanking mechanism 500 includes a third power member that drives the product on the rotating wheel 220 along a first guide channel out of the rotating wheel 220.

It can be understood that the third power member may be a negative pressure fan or a blower, the magnetic force between the product and the magnetic wheel 210 at the notch 211 of the rotating wheel 220 is low, and the negative pressure fan or the blower can easily drive the product to be conveyed to the guide duct and discharge the product through the guide duct.

Based on the second embodiment of this embodiment, the blanking mechanism 500 includes a cutting plate and a second guiding pipe, the cutting plate is connected to the second guiding pipe, the cutting plate is tangent to the rotating wheel 220, after the product reaches the position of the cutting plate, the product will continue to move along the cutting plate, and the cutting plate will guide the product to be transported to the second guiding pipe, so that the product is discharged from the rotating wheel 220.

It will be appreciated that the portion of the cutting plate adjacent to the diverting wheel is tangential to the rotating wheel 220, the cutting plate is fixed, the rotating wheel 220 rotates relative to the cutting plate, and the product is transported further along the cutting plate and gradually onto the second guiding pipe as it moves to the cutting plate.

In some embodiments, the silver dipping machine further comprises a drying step, the silver dipping machine further comprises a heating mechanism 600, and after the rotating wheel 220 transports the product to the drying tank 610, the heating mechanism 600 enables the coating liquid to dry the product.

It can be understood that the feeding mechanism 400 puts the product into the rotating wheel 220, the rotating wheel 220 rotates, the product sequentially passes through the silver coating mechanism, the heating mechanism 600 and the blanking mechanism 500, the silver coating mechanism coats the coating liquid on the product, the heating mechanism 600 dries the coating liquid, the blanking mechanism 500 transports the product out of the rotating wheel 220, the rotating wheel 220 continues to rotate, the feeding mechanism 400 continuously puts the product into the rotating wheel 220, a complete closed loop is formed, and the product can be continuously produced.

Based on the expansion of heating mechanism 600, heating mechanism includes drying tank 610 and heating member 620, and heating member 620 installs on drying tank 610, and heating member 620 heats drying tank 610, and the product conveys along rotating wheel 220, and the product is transported along drying tank 610.

It can be understood that the drying slot 610 is a track extending along the circumference of the rotating wheel 220, and the product is continuously heated while passing through the drying slot 610, so that the product can be effectively dried.

It is understood that the heating element 620 is a heating tube or a hot air blower.

It can be understood that the drying tank 610 may be a hollow structure, a ventilation duct is arranged in the drying tank 610, air is continuously introduced into the ventilation duct, the air is continuously heated by the heating element 620, so that the drying tank 610 keeps a heating state, and the air is continuously circulated, so that the overall temperature of the drying tank 610 is relatively uniform; the drying groove 610 may also be a solid structure, the drying groove 610 is heated by a heating pipe, and the overall temperature of the drying groove 610 is continuously increased by heat transfer of the solid structure of the drying groove 610.

In some embodiments, the tank 310 is provided with a feed port from which the coating solution is added to the tank 310. When the coating is below a certain level, the coating liquid is added through the feed opening, so that the coating liquid can be continuously attached to the feeding roller 320.

It is noted that terms such as "one embodiment," "some embodiments," "base embodiment," "extended embodiment," and the like may be used herein to describe various embodiments of the invention, and that particular features, structures, materials, or characteristics of the various embodiments may be combined while remaining within the spirit and scope of the invention.

Although a part of the embodiments of the present invention has been shown and described in the present specification, the present invention should not be limited to the above-described embodiments, and variations, modifications, equivalents and equivalent modifications of the embodiments without departing from the spirit and the spirit of the present invention should be included in the scope of the present disclosure, and they should be considered as falling within the scope of the present invention, as long as the technical effects of the present invention are achieved by the same or equivalent means.

Claims

1. A silver dipping method, applied to a silver dipping machine, the silver dipping machine comprising:

a bracket (100);

the conveying mechanism (200) comprises a magnetic wheel (210), a rotating wheel (220) and a second power piece, the rotating wheel (220) is rotatably arranged on the support (100), the rotating wheel (220) is provided with an inner cavity, the magnetic wheel (210) is arranged in the inner cavity, a notch (211) is formed in the outer wall of the magnetic wheel (210), the second power piece is connected with the rotating wheel (220), and the second power piece drives the rotating wheel (220) to rotate relative to the magnetic wheel (210);

the liquid coating mechanism (300) comprises a trough (310), a feeding roller (320) and a first power part, wherein the trough (310) is used for storing coating liquid, the feeding roller (320) is rotatably arranged on the support (100), the first power part is connected with the feeding roller (320), and the first power part is used for driving the feeding roller (320) to rotate and coating the coating liquid in the trough (310) on a product;

a feeding mechanism (400) provided on the bracket (100), the feeding mechanism (400) being for transporting a product to the rotating wheel (220);

the blanking mechanism (500) is arranged at the notch (211), and the blanking mechanism (500) is used for conveying products out of the rotating wheel (220);

the silver dipping method comprises the following steps:

adding materials, namely adding coating liquid into a material groove (310), and putting a product to be stained with silver into a feeding mechanism (400);

conveying, wherein the feeding mechanism (400) sends the product to the rotating wheel (220), the magnetic wheel (210) enables the product to be adsorbed on the rotating wheel (220), the first power part drives the feeding roller (320) to rotate, and the coating liquid in the trough (310) is adhered to the surface of the feeding roller (320);

coating, wherein the rotating wheel (220) and the feeding roller (320) rotate synchronously, the surface of a product on the rotating wheel (220) is contacted with the coating liquid on the feeding roller (320), and the coating liquid of the feeding roller (320) is coated on the surface of the product;

and discharging the product, wherein the blanking mechanism (500) discharges the product out of the rotating wheel (220).

2. The silver staining method of claim 1, wherein the feeding mechanism (400) comprises a vibration plate (410), the products to be stained are placed in the vibration plate (410), the vibration plate (410) arranges the disordered products, and the ordered products are transferred to the rotating wheel (220) one by one.

3. The method of claim 1 wherein the bath (310) is provided with a feed port to which the coating solution is added.

4. The silver dipping method according to claim 1, further comprising a limiting plate, wherein the limiting plate is arranged on the bracket (100), a limiting gap is arranged between the limiting plate and the rotating wheel (220), and the limiting plate arranges the products to the same height after the rotating wheel (220) moves the products to the limiting gap.

5. The silver dipping method according to claim 1, wherein the feeding roller (320) is provided with a scraping plate (330), and the scraping plate (330) can scrape off the excessive coating liquid on the feeding roller (320) to keep the thickness of the coating liquid on the feeding roller (320) consistent.

6. The method of claim 1, wherein the rotational wheel (220) and the loading roller (320) rotate at the same linear speed and in opposite directions.

7. The method of claim 1, wherein said feeding mechanism (500) comprises a third power member and a first guiding duct, said third power member driving the product on the rotating wheel (220) to exit said rotating wheel (220) along said first guiding duct.

8. The method of claim 1, further comprising a drying step, wherein the silver staining machine further comprises a heating mechanism (600), and wherein the heating mechanism (600) dries the product by applying the coating solution after the rotating wheel (220) transports the product to the drying tank (610).

9. The silver staining method of claim 8, wherein the heating mechanism comprises a drying tank (610) and heating members (620), the heating members (620) being mounted on the drying tank (610), the heating members (620) heating the drying tank (610), the product being conveyed along the rotating wheels (220), the product being transported along the drying tank (610).

10. The method of claim 1 wherein the tank (310) is provided with a feed port from which the coating solution is fed to the tank (310).