CN115475724A

CN115475724A - Wet coating equipment and coating device

Info

Publication number: CN115475724A
Application number: CN202210079391.5A
Authority: CN
Inventors: 吕峻杰; 杨筱雯; 蔡季刚
Original assignee: Mirle Automation Corp
Current assignee: Mirle Automation Corp
Priority date: 2021-06-16
Filing date: 2022-01-24
Publication date: 2022-12-16
Also published as: JP7393476B2; KR102614589B1; KR20220168546A; JP2022192024A

Abstract

The invention discloses wet coating equipment and a coating device. The coating device comprises a shell and at least one coating head. The inside of casing is formed with a plurality of storage spaces, and the casing is formed with respectively communicate in a plurality of storage space's a plurality of through-hole. At least one coating head is inserted into the plurality of storage spaces of the shell, and at least one coating head extends out of the shell. Therefore, the coating device not only can realize accurate coating, but also can adopt the coating with wider viscosity coverage range, thereby greatly expanding the application range.

Description

Wet coating equipment and coating device

Technical Field

The present disclosure relates to coating apparatuses, and particularly to a wet coating apparatus and a coating apparatus.

Background

The conventional coating apparatus includes a dry coating method and a wet coating method. The dry coating method includes sputtering, physical Vapor Deposition (PVD), and Chemical Vapor Deposition (CVD). The wet coating method includes slit coating (slit coating) and spray coating (spray). However, the above coating method has limitations and disadvantages, so that the existing spraying equipment is limited by the above coating method and is difficult to be further improved.

The present inventors have considered that the above-mentioned drawbacks can be improved, and have made intensive studies and use of scientific principles, and finally have proposed the present invention which is designed reasonably and effectively to improve the above-mentioned drawbacks.

Disclosure of Invention

Embodiments of the present invention provide a wet coating apparatus and a coating device, which can effectively overcome the defects possibly generated by the existing spraying apparatus.

The embodiment of the invention discloses wet coating equipment, which comprises: a coating apparatus, comprising: the device comprises a shell, a plurality of storage spaces and a plurality of through holes, wherein the storage spaces are independent from one another and are formed in the shell; the coating heads are inserted into the storage spaces of the shell, and each coating head extends out of the shell; and the feeding device is connected with the through holes of the shell and can be used for synchronously injecting the coating to the coating heads from the through holes.

Optionally, the housing includes two plate bodies joined to each other, and a plurality of receiving grooves are formed in each plate body, so that the plurality of receiving grooves of any one plate body are respectively butted to the plurality of receiving grooves of another plate body to form a plurality of storage spaces together; wherein, at least one of the two plate bodies is provided with a plurality of through holes.

Optionally, each applicator head is inserted in a magazine.

Optionally, each coating head is a porous structure with compression elasticity and is detachably inserted in the shell.

Alternatively, when the wet coating apparatus performs a coating operation such that a plurality of coating heads continuously output the coating material, the supply device can be used to maintain the content of each coating head.

Optionally, the feeding means comprises: a switching mechanism, comprising: the distribution pipelines are respectively provided with a feeding port, a mixing port and a discharging port; wherein, the discharge ports of the plurality of distribution pipelines are respectively connected with the plurality of through holes; the linkage pieces are respectively connected with the distribution pipelines, and each linkage piece can be used for adjusting the connected distribution pipeline between a feeding state and a discharging state; the synchronous part is linked with the plurality of linkage parts and can drive the plurality of linkage parts to synchronously move so as to enable the plurality of distribution pipelines to be in one of a feeding state and a discharging state; when any distribution pipeline is in a feeding state, the blending port is only communicated with the feeding port; when any distribution pipeline is in a discharging state, the blending port is only communicated with the discharging port; the storage mechanism is used for storing a coating and is connected with the feeding ports of the distribution pipelines; the feeding mechanism is connected with the mixing ports of the plurality of distribution pipelines; when the distribution pipelines are all in a feeding state, the feeding mechanism can be used for receiving the coating from the storage mechanism through the distribution pipelines; when the distribution pipelines are all in the discharging state, the feeding mechanism can be used for synchronously outputting the coating in the distribution pipelines to the coating device.

Optionally, each linkage member is further defined as a gear, and the synchronizing member is defined as a rack engaged with the plurality of linkage members, and the synchronizing member can move relative to the plurality of linkage members to synchronously rotate the plurality of linkage members.

Optionally, each distribution pipeline includes a three-way valve pipe and a switching member rotatably installed in the three-way valve pipe, and each linkage member is connected to the switching member of the corresponding distribution pipeline and can rotate synchronously, so that the corresponding distribution pipeline is in one of a feeding state and a discharging state.

Optionally, the switching mechanism includes a driving cylinder connected to the synchronizer, and the driving cylinder is used for pushing the synchronizer, so that the synchronizer can drive the plurality of linkage members to move synchronously.

Optionally, the feeding mechanism comprises: a plurality of plungers each having a tube body and a push rod inserted into the tube body, and each push rod being relatively movable along the tube body; the tube bodies of the plungers are connected to the mixing ports of the distribution pipelines and used for receiving the coating from the storage mechanism; and the driver is connected with the push rods of the plungers and can drive the push rods of the plungers to synchronously move so as to synchronously output the coatings in the plungers.

Optionally, each plunger includes an exhaust valve port positioned above the magazine; in each plunger, the push rod is hollow and communicated with the tube body and the exhaust valve port, when the exhaust valve port is in an open position, bubbles in the plunger can be discharged through the exhaust valve port, and when the exhaust valve port is in a closed position, the push rod can move relative to the tube body to output the paint in the plunger.

The embodiment of the invention also discloses a coating device, which comprises: the device comprises a shell, a storage box and a control device, wherein a plurality of storage spaces are formed in the shell, and a plurality of through holes which are respectively communicated with the storage spaces are formed in the shell; and at least one coating head, which is inserted into the plurality of storage spaces of the shell and extends out of the shell.

Optionally, the plurality of holding spaces of the housing are independent of each other and do not communicate with each other.

Optionally, the at least one coating head is a porous structure with compression elasticity and is detachably inserted in the housing.

In summary, the wet coating apparatus and the coating device disclosed in the embodiments of the present invention continuously inject the coating material into the coating head, so that the coating device can not only realize precise coating, but also adopt the coating material with a wide viscosity coverage, thereby greatly expanding the application range of the coating device (or the wet coating apparatus).

For a better understanding of the features and technical content of the present invention, reference is made to the following detailed description of the invention and the accompanying drawings, which are provided for illustration purposes only and are not intended to limit the scope of the invention in any way.

Drawings

Fig. 1 is a schematic plan view of a wet coating apparatus according to an embodiment of the present invention.

Fig. 2 is a partially exploded schematic view of the coating apparatus of fig. 1.

Fig. 3 is a schematic plan view of the coating apparatus of fig. 1 (with one plate omitted).

Fig. 4 is a perspective view of the switching mechanism in fig. 1.

FIG. 5 is a schematic cross-sectional view of any one of the dispensing lines of FIG. 4 in a feeding state.

Fig. 6 is a schematic cross-sectional view of any one of the dispensing lines of fig. 4 in an out-feed state.

Fig. 7 is a partial perspective view of a feeding device according to an embodiment of the present invention.

Detailed Description

The following description is provided to describe embodiments of the present disclosure relating to a wet coating apparatus and a coating device by specific examples, and those skilled in the art can understand advantages and effects of the present disclosure from the disclosure of the present disclosure. The invention is capable of other and different embodiments and its several details are capable of modifications and various changes in detail without departing from the spirit and scope of the present invention. The drawings of the present invention are for illustrative purposes only and are not drawn to scale. The following embodiments will further explain the related art of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention.

It will be understood that, although the terms "first," "second," "third," etc. may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are used primarily to distinguish one element from another element or from one signal to another signal. Additionally, the term "or" as used herein is intended to include any one or combination of the associated listed items, as the case may be.

Fig. 1 to 7 show an embodiment of the present invention. As shown in fig. 1, the present embodiment discloses a wet coating apparatus 100, which includes a coating device 1 and a feeding device 2 connected to the coating device 1, and the coating device 1 is detachably mounted on the feeding device 2. It is particularly emphasized that the wet coating apparatus 100 is different from the dry coating apparatus in this embodiment.

It should be noted that the wet coating apparatus 100 is illustrated by using the coating device 1 and the feeding device 2 in the embodiment, but the invention is not limited thereto. For example, in other embodiments not shown in the present disclosure, the coating device 1 can be used alone (for example, sold) or with other feeding devices different from those of the present embodiment; alternatively, the feeding device 2 may be used alone (e.g., vending) or with other devices. The specific construction of the coating device 1 and the feeding device 2 will be described first, and then the connection relationship between the two will be described in due course.

As shown in fig. 1 to 3, the coating apparatus 1 includes a housing 11 and a plurality of coating heads 12 mounted on the housing 11. Wherein, a plurality of storage spaces 112 independent from each other are formed inside the housing 11, and the plurality of storage spaces 112 of the housing 11 are preferably independent from each other and are not communicated with each other.

In more detail, the housing 11 in this embodiment includes two plates 111 joined to each other, and each of the plates 111 is preferably flat. A plurality of accommodating grooves 1111 are formed in each of the plate bodies 111, so that the accommodating grooves 1111 of any one of the plate bodies 111 are respectively connected to the accommodating grooves 1111 of another one of the plate bodies 111 in an abutting manner, thereby forming a plurality of the material storage spaces 112 together. That is, any two of the receiving grooves 1111 facing each other and belonging to different plate bodies 111 jointly surround and form one of the storage spaces 112.

Further, the housing 11 is formed with a plurality of through holes 1112 respectively communicating with a plurality of the storage spaces 112, and each of the storage spaces 112 may communicate with at least one of the through holes 1112, but the present invention is not limited thereto. In the present embodiment, the through holes 1112 are formed in at least one of the two plate bodies 111, and the through holes 1112 are preferably located at a same level (e.g., the through holes 1112 are spaced apart from an edge of the corresponding plate body 111 by an equal distance).

Furthermore, each of the coating heads 12 is detachably inserted into the housing 11 and partially protrudes from the housing 11, and the partial portions of the coating heads 12 are preferably flush with each other so as to facilitate coating in a coating operation of a plate material (not shown). One of the coating heads 12 is disposed in each of the storage spaces 112, so that each coating head 12 can receive or store a coating material M (e.g., a glue) without interruption, but the invention is not limited thereto.

In more detail, in the present embodiment, the plurality of coating heads 12 are clamped and fixed between the two plate bodies 111, and the plurality of coating heads 12 preferably have substantially the same structure. Wherein each coating head 12 can take the coating material M from the corresponding through hole 1112.

It should be noted that the coating material M is stored and transported by the coating head 12, so that a wide range of viscosity (e.g., 10cps to 100 cps) can be covered, thereby facilitating the expansion of the application range of the coating apparatus 1 (or the wet coating device 100).

Further, each of the coating heads 12 has a porous structure having compressive elasticity so as to be able to accumulate the coating material M and to transfer the accumulated coating material M to the sheet material during the coating operation. In the process of transferring the coating material M, the coating head 12 may transfer the coating material M by contacting or non-contacting the plate, and the invention is not limited herein.

It should be noted that, in the present embodiment, the coating apparatus 1 is illustrated as including a plurality of coating heads 12 having substantially the same structure and detachably inserted in the housing 11, but the present invention is not limited thereto. For example, in other embodiments not shown in the present disclosure, the number of the applicator heads 12 included in the applicator device 1 may be at least one (that is, at least one applicator head 12 is inserted into the plurality of storage spaces 112 of the housing 11, or at least one applicator head 12 of the plurality of applicator heads 12 is non-detachably fixed to the housing 11.

As described above, in the coating apparatus 1 of the present embodiment, the coating material M is continuously injected into the coating head 12, so that the coating apparatus 1 not only can achieve precise coating, but also can adopt the coating material M with a wide viscosity coverage, thereby greatly expanding the application range of the coating apparatus 1.

Further, when the wet coating apparatus 100 performs the coating operation so that the coating heads 12 continuously output the coating material M, the feeding device 2 can be used to maintain the material content of each coating head 12, so that the coating device 1 can realize stable coating for a longer time by being matched with the feeding device 2 in the embodiment.

Wherein the feeding device 2 is connected to the plurality of through holes 1112 of the housing 11, and the feeding device 2 is configured to simultaneously feed the coating material M from the plurality of through holes 1112 to the plurality of coating heads 12. In the embodiment, the feeding device 2 includes a switching mechanism 21, a storage mechanism 22 (e.g., storage barrel) for storing the coating material M, and a feeding mechanism 23, and the coating device 1, the storage mechanism 22, and the feeding mechanism 23 can be connected or connected to the switching mechanism 21 (via a transmission tube).

It should be noted that, as shown in fig. 1, fig. 2 and fig. 4, the feeding device 2 is described in this embodiment by using the switching mechanism 21 in combination with the coating device 1, the storing mechanism 22 and the feeding mechanism 23, but the invention is not limited thereto. For example, in other embodiments not shown in the present disclosure, the switching mechanism 21 can be used alone (e.g., vending) or with other devices. The specific structure of each mechanism of the feeding device 2 will be explained first, and then the connection relationship between each mechanism will be explained in due time.

In the present embodiment, the switching mechanism 21 includes a plurality of distribution pipelines 211, a plurality of linkage members 212 respectively connected to the distribution pipelines 211, a synchronization member 213 linked to the linkage members 212, and a driving cylinder 214 connected to the synchronization member 213, but the present invention is not limited thereto. For example, in other embodiments not shown in the present disclosure, the driving cylinder 214 may be replaced by other driving methods.

Each of the distribution pipes 211 has a feeding port 2113, a mixing port 2114, and an discharging port 2115, and the specific structure of any one of the distribution pipes 211 can be adjusted and changed according to design requirements, which is not limited herein. In this embodiment, a plurality of the distribution pipes 211 may have substantially the same structure, and each of the distribution pipes 211 includes a three-way valve tube 2111 and a switching member 2112 rotatably installed in the three-way valve tube 2111.

In each distribution pipeline 211, the three-way valve tube 2111 is formed with the feeding port 2113, the blending port 2114 and the discharging port 2115, and the switching member 2112 can rotate to selectively communicate the blending port 2114 of the three-way valve tube 2111 with one of the feeding port 2113 and the discharging port 2115. Further, the switch 2112 can rotate to make the mixing port 2114 of the three-way valve tube 2111 communicate with the feeding port 2113 only, so as to make the dispensing line 211 in a feeding state; alternatively, the switching member 2112 can be rotated to connect the dispensing port 2114 of the three-way valve tube 2111 to the discharge port 2115 only, so as to place the dispensing line 211 in a discharge state.

Each of the linkage members 212 can be used to adjust the connected distribution pipeline 211 between the feeding state (see fig. 5) and the discharging state (see fig. 6). In this embodiment, each of the linking members 212 is connected to the switching member 2112 of the corresponding distribution pipeline 211 and can rotate synchronously, so that the corresponding distribution pipeline 211 is in one of the feeding state and the discharging state.

Furthermore, as shown in fig. 1, fig. 2, and fig. 4 to fig. 7, the synchronizing member 213 can drive the plurality of linking members 212 to move synchronously, so that the plurality of distribution pipes 211 are all in one of the feeding state and the discharging state. In this embodiment, the driving cylinder 214 can be used to push the synchronizing member 213, so that the synchronizing member 213 can drive the plurality of linking members 212 to move synchronously. The driving cylinder 214 may be a hydraulic cylinder or a pneumatic cylinder, but the invention is not limited thereto.

In more detail, each of the linkage members 212 is further defined as a gear, and the synchronizing member 213 is defined as a rack engaged with the plurality of linkage members 212, and the synchronizing member 213 can move relative to the plurality of linkage members 212 to rotate the plurality of linkage members 212 in synchronization. Accordingly, the distribution pipes 211, the linking parts 212 and the synchronizing parts 213 are precisely and synchronously fed in a mechanical cooperation manner in the present embodiment (for example, the distribution pipes 211 can be synchronously in the discharging state), but the invention is not limited thereto. For example, in other embodiments not shown in the present invention, the switching mechanism 21 of the wet coating apparatus 100 may be implemented by an electronic component (e.g., a solenoid valve) instead under the condition of low requirement for feed synchronization.

The above is a description of the structure of the switching mechanism 21, and the connection relationship between the switching mechanism 21 and other components is described next below. The switching mechanism 21 is connected to the through holes 1112 of the coating apparatus 1 through the discharge ports 2115 of the plurality of distribution lines 211, the switching mechanism 21 is connected to the stocker 22 through the feed ports 2113 of the plurality of distribution lines 211, and the switching mechanism 21 is connected to the feeding mechanism 23 through the dispensing ports 2114 of the plurality of distribution lines 211.

Further, as shown in fig. 1 and 5, when the plurality of dispensing lines 211 are all in the feeding state, the feeding mechanism 23 can be used to receive the coating material M from the stock mechanism 22 through the plurality of dispensing lines 211. Furthermore, as shown in fig. 1 and fig. 6, when the distribution pipes 211 are all in the discharging state, the feeding mechanism 23 can be used to synchronously output the coating material M therein to the coating apparatus 1 (or the discharge ports 2115 of the distribution pipes 211).

Accordingly, the switching mechanism 21 can be used for switching different coating time points; for example, when the wet coating apparatus 100 is performing the coating operation, the switching mechanism 21 switches the coating material M to flow from the feeding mechanism 23 to the coating device 1; when the paint M in the supply mechanism 23 is used up and needs to be replenished, the switching mechanism 21 switches to allow the paint M in the stock mechanism 22 to flow to the supply mechanism 23, and the supply mechanism 23 can eliminate air bubbles in the paint M by the structural design relative to the stock mechanism 22.

The feeding mechanism 23 is preferably implemented by combining the following mechanisms to effectively control the amount of the material output to the switching mechanism 21, but the invention is not limited thereto. In more detail, the feeding mechanism 23 in this embodiment comprises a plurality of plungers 231 and a driver 232 (e.g., a motor) connected to the plurality of plungers 231. The plurality of plungers 231 have substantially the same structure and the number thereof may be equal to the number of the plurality of dispensing ports 2114, but the invention is not limited thereto.

Each of the plungers 231 has a tube body 2311, a push rod 2312 inserted into the tube body 2311, and an exhaust valve port 2313 located higher than the magazine 22, and each of the push rods 2312 is relatively movable along the tube body 2311. In each of the plungers 231, the push rod 2312 is hollow and communicates with the tube body 2311 and the exhaust valve port 2313, and when the exhaust valve port 2313 is in an open position (as shown in fig. 1 and 5, the corresponding dispensing line 211 is preferably in the charging state), air bubbles existing in the plungers 231 can be discharged through the exhaust valve port 2313, and when the exhaust valve port 2313 is in a closed position (as shown in fig. 1 and 6, the corresponding dispensing line 211 is preferably in the discharging state), the push rod 2312 can move relative to the tube body 2311 to output the coating material M in the plungers 231.

Further, the tubes 2311 of the plungers 231 are connected to the dispensing ports 2114 of the dispensing lines 211 (e.g., the bottom of each tube 2311 is connected to one of the dispensing ports 2114) to receive the coating material M from the stocker 22. Furthermore, the driver 232 is connected to the push rods 2312 of the plurality of plungers 231, and the driver 232 can drive the push rods 2312 of the plurality of plungers 231 to synchronously move so as to synchronously output the coating materials M therein.

Technical effects of embodiments of the present invention

In addition, the feeding device and the switching mechanism thereof disclosed in the embodiment of the invention achieve the effect of accurate and synchronous feeding (for example, the plurality of distribution pipelines can be synchronously in the discharging state) through the mechanism cooperation among the plurality of distribution pipelines, the plurality of linkage pieces and the synchronous pieces. Wherein, the switching mechanism can be used for switching the flow direction of the coating at different time points, such as: the switching of the switching mechanism can enable the coating to flow to the plurality of discharge ports from the feeding mechanism; alternatively, the switching mechanism may be switched to allow the paint in the stock mechanism to flow to the supply mechanism.

The disclosure is only a preferred embodiment of the invention and is not intended to limit the scope of the invention, so that all equivalent technical changes made by using the contents of the specification and drawings are included in the scope of the invention.

Claims

1. A wet coating apparatus, characterized in that it comprises:

a coating apparatus, comprising:

the device comprises a shell, a plurality of storage spaces and a plurality of connecting holes, wherein the storage spaces are independent from one another and are formed in the shell; and

the coating heads are inserted into the storage spaces of the shell, and each coating head extends out of the shell; and

and the feeding device is connected with the through holes of the shell and can be used for synchronously injecting the coating to the coating heads from the through holes.

2. A wet coating apparatus according to claim 1, wherein said housing includes two plate bodies joined to each other, and a plurality of receiving grooves are formed in each of said plate bodies, so that said plurality of receiving grooves of any one of said plate bodies are respectively butted against said plurality of receiving grooves of another one of said plate bodies to collectively form a plurality of said receiving spaces; wherein at least one of the two plate bodies is formed with a plurality of the through holes.

3. A wet coating apparatus according to claim 1, wherein each of said coating heads is inserted in one of said storage spaces.

4. A wet coating apparatus according to claim 1, wherein each of said coating heads is a porous structure having compressive elasticity and is detachably inserted into said housing.

5. A wet coating apparatus according to claim 1, wherein said supply means is adapted to maintain the material content of each of said coating heads while said wet coating apparatus performs a coating operation such that a plurality of said coating heads continuously output said coating material.

6. A wet coating apparatus according to claim 1, wherein said supply means comprises:

a switching mechanism, comprising:

the distribution pipelines are respectively provided with a feeding port, a mixing port and a discharging port; wherein the discharge ports of the plurality of distribution pipelines are respectively connected to the plurality of through holes;

the linkage pieces are respectively connected with the distribution pipelines, and each linkage piece can be used for adjusting the connected distribution pipeline between a feeding state and a discharging state; and

the synchronous piece is linked with the linked pieces and can drive the linked pieces to synchronously move so as to enable the distribution pipelines to be in one of the feeding state and the discharging state;

when any distribution pipeline is in the feeding state, the blending port is only communicated with the feeding port; when any one distribution pipeline is in the discharging state, the blending port is only communicated with the discharging port;

the storage mechanism is used for storing a coating and is connected with the feeding ports of the distribution pipelines; and

the feeding mechanism is connected with the mixing ports of the plurality of distribution pipelines;

wherein when the plurality of dispensing lines are in the feeding state, the feeding mechanism is operable to receive the coating material from the storage mechanism through the plurality of dispensing lines; when the distribution pipelines are all in the discharging state, the feeding mechanism can be used for synchronously outputting the coating in the distribution pipelines to the coating device.

7. A wet coating apparatus according to claim 6 wherein each of said linkages is further defined as a gear and said synchronizing member is defined as a rack engaging a plurality of said linkages, said synchronizing member being movable relative to said plurality of said linkages to rotate said plurality of said linkages in synchronization.

8. A wet coating apparatus according to claim 7, wherein each of said distribution pipes includes a three-way valve pipe and a switching member rotatably installed in said three-way valve pipe, and each of said linkages is connected to said switching member of the corresponding distribution pipe to be capable of rotating synchronously so that the corresponding distribution pipe is in one of said feeding state and said discharging state.

9. The wet coating apparatus of claim 6, wherein the switching mechanism comprises a driving cylinder connected to the synchronizing member, and the driving cylinder is used for pushing the synchronizing member, so that the synchronizing member can drive the plurality of linkage members to move synchronously.

10. A wet coating apparatus according to claim 6, wherein said feed mechanism comprises:

the plunger pistons are respectively provided with a tube body and a push rod inserted in the tube body, and each push rod can move relatively along the tube body; wherein the tubes of the plurality of plungers are connected to the dispensing ports of the plurality of dispensing lines for receiving the coating material from the holding mechanism; and

the driver is connected with the push rods of the plungers, and can drive the push rods of the plungers to synchronously move so as to synchronously output the coatings in the plungers.

11. A wet coating apparatus according to claim 10 wherein each said plunger includes an exhaust port located higher than said magazine; in each plunger, the push rod is hollow and is communicated with the tube body and the exhaust valve port, when the exhaust valve port is in an open position, bubbles in the plunger can be discharged through the exhaust valve port, and when the exhaust valve port is in a closed position, the push rod can move relative to the tube body to output the coating in the plunger.

12. A coating apparatus, characterized in that the coating apparatus comprises:

the device comprises a shell, a plurality of storage spaces and a plurality of through holes, wherein the storage spaces are formed in the shell, and the through holes are respectively communicated with the storage spaces; and

the coating heads are inserted into the storage spaces of the shell, and extend out of the shell.

13. A coating apparatus according to claim 12, wherein a plurality of said magazine spaces of said housing are independent of each other and do not communicate with each other.

14. The coating apparatus as claimed in claim 13, wherein the housing includes two plate bodies joined to each other, and a plurality of receiving grooves are formed in each of the plate bodies, so that the plurality of receiving grooves of any one of the plate bodies are respectively butted with the plurality of receiving grooves of another one of the plate bodies to form a plurality of the storage spaces together; wherein at least one of the two plate bodies is formed with a plurality of the through holes.

15. The coating apparatus of claim 12 wherein at least one of said coating heads is a porous structure having compressive resiliency and is removably insertable into said housing.