CN112606537B

CN112606537B - Intelligent continuous printing equipment for microporous layers of multi-specification fuel cells and printing process thereof

Info

Publication number: CN112606537B
Application number: CN202011476952.2A
Authority: CN
Inventors: 郝金凯; 张洪杰; 邵志刚
Original assignee: Dalian Institute of Chemical Physics of CAS
Current assignee: Dalian Institute of Chemical Physics of CAS
Priority date: 2020-12-14
Filing date: 2020-12-14
Publication date: 2021-08-10
Anticipated expiration: 2040-12-14
Also published as: CN112606537A

Abstract

The invention relates to the field of fuel cells, in particular to intelligent continuous printing equipment for microporous layers of multi-specification fuel cells and a printing process thereof. The screen printing machine mainly comprises a plurality of screen printing devices, two parallel conveying mechanisms and a rotating table arranged between the two conveying mechanisms, wherein the rotating table is provided with a heating table, a cooling table and a plc system; the equipment can realize multiple continuous processes of printing, drying, detecting and cooling of the microporous layers on one screen printing device, solves the problems of large requirement on the number of ovens and large occupied area of the field, is connected with a plc system for realizing independent control of the printing process of each screen printing device, can be used for timely replenishing and brushing the same microporous layer according to the printing condition to meet the requirement on the thickness of the load or timely stopping printing by combining a laser thickness detector, avoids the excess phenomenon, at least completes the printing preparation of two gas diffusion layers in one process, and has higher working efficiency.

Description

Intelligent continuous printing equipment for microporous layers of multi-specification fuel cells and printing process thereof

Technical Field

The invention relates to the field of fuel cells, in particular to intelligent continuous printing equipment for microporous layers of multi-specification fuel cells and a printing process thereof.

Background

A pem fuel cell is a power generation device that directly converts chemical energy existing in fuel and oxidant into electric energy, and has the advantages of small system volume, high energy density, cleanness, no pollution, no need of complicated air supply and humidification system, etc., and is gaining attention in the industry. The membrane electrode is a core component and consists of a proton exchange membrane, a catalyst layer and a gas diffusion layer, wherein the gas diffusion layer is an important component of a membrane electrode three-in-one component and is an important channel for transmitting reaction gas and transferring generated water. The gas diffusion layer is mainly prepared by uniformly coating conductive carbon black slurry on the surface of the hydrophobic microporous layer and sintering and curing at high temperature; the coating modes comprise screen printing, electrostatic spinning, spray printing and brush coating and coating film forming, wherein the screen printing mode has the advantages of strong adhesive force, soft surface, small impression, strong ink layer covering power and the like, so the application is the most extensive.

However, when the microporous layer made of non-flexible paper is prepared by screen printing, each microporous layer needs to be positioned in the printing process by means of auxiliary equipment such as a pressing plate, and the screen size of the screen printing is limited, and only a single microporous layer can be printed, so that manual or manual replacement is needed in the printing process, a continuous production process cannot be achieved, production efficiency is affected, and further the screen printing process cannot be applied to commercialization of a gas diffusion layer, for example, the preparation method of the gas diffusion layer for the proton exchange membrane fuel cell disclosed in patent 201710318918.4, and the screen printing directly adopted realizes the printing and coating process of the single microporous layer.

In order to solve the above problems, a continuous printing process is also added to screen printing in the market at present, such as an apparatus and a method for continuously preparing a gas diffusion layer of a fuel cell disclosed in patent 201911367629.9, wherein the apparatus comprises a feeding end conveyor belt for continuously conveying raw carbon paper from a raw carbon paper support by a first motor; the screen printing machine is used for coating to obtain microporous layer carbon paper; the blanking end conveyor belt runs under the drive of a second motor and continuously conveys microporous carbon paper to sequentially pass through a vacuum oven and a high-temperature atmosphere oven to obtain a gas diffusion layer and then is wound; the feeding end conveyor belt is connected with a first vacuum pump, and the discharging end conveyor belt is connected with a second vacuum pump; the synchronous controller controls the first motor and the second motor to start and stop synchronously. According to the invention, the feeding end conveyor belt and the discharging end conveyor belt are respectively connected with the first vacuum pump and the second vacuum pump to provide vacuum adsorption, so that the stable and continuous conveying of the raw material carbon paper is ensured; the synchronous start and stop of the first motor and the second motor are beneficial to accelerating the production beat and realizing the continuous coating of the raw material carbon paper.

Although the above patent can realize batch transportation of the microporous layer to the screen printing machine to realize printing, for gas diffusion layers with different specifications, different requirements are required for the loading amount of slurry on the surface of the microporous layer, the above method can only realize one-time printing and often cannot meet the requirement for the loading amount.

Disclosure of Invention

The invention aims to provide intelligent continuous printing equipment for microporous layers of multi-specification fuel cells and a printing process thereof, which can be used for continuously printing gas diffusion layers with multi-specification requirements, can realize real-time drying of the microporous layers without arranging a plurality of drying ovens, and solves the problems of large occupied area and high cost.

In order to realize the purpose, the invention adopts the following technical scheme:

the invention provides a multi-specification fuel cell micropore continuous printing device, which comprises a screen printing device and a Plc system, wherein the screen printing device comprises a sheet type printing table and a sensor for identifying a micropore layer; the intelligent continuous printing equipment for the microporous layer further comprises the following devices:

the system comprises two parallel conveying mechanisms, a micro-porous layer, a sensor and a micro-porous layer, wherein each conveying mechanism (a plurality of screen printing devices are oppositely arranged in pairs, each conveying mechanism simultaneously penetrates through the upper part of a sheet type printing table of each screen printing device to convey the micro-porous layer to the screen printing devices, the conveying mechanisms are respectively provided with a limiting groove for embedding the micro-porous layer in an array mode, when the micro-porous layer is embedded in the limiting groove, the upper surface of the micro-porous layer is flush with the upper surface of the conveying mechanism, and the distance between every two limiting grooves on each conveying mechanism is equal to the distance between sensors in two adjacent screen printing devices on the conveying mechanism;

the limiting mechanism is arranged in the sheet type printing table and used for limiting the microporous layer;

the rotary table is driven by the driving mechanism and arranged between the two conveying mechanisms, a plurality of heating tables and cooling tables which can be contacted with the bottoms of the sheet type printing tables are arranged on the rotary table, the heating tables and the cooling tables are arranged in point symmetry along the circle center of the rotary table, namely when the heating table is arranged at the bottom of the sheet type printing table in one conveying mechanism, the cooling table is arranged at the bottom of the sheet type printing table in the other conveying mechanism, and a circuit control system for respectively controlling the heating table and the cooling table to work is arranged in the rotary table;

the laser thickness detector is arranged on each screen printing device and is used for detecting the thickness of the microporous layer printed each time;

each screen printing device, the sensor, the conveying mechanism, the limiting mechanism, the driving mechanism, the circuit control system and the laser thickness detector are in signal connection with a circuit of the Plc system, and the Plc system comprises a timing module which is used for controlling the two conveying mechanisms to realize the conveying with time difference.

In the above technical solution, further, the conveying mechanism includes a conveying steel belt filled with iron powder inside; the conveying steel belt is positioned in the limiting groove, and a plurality of adsorption through holes are formed in the array.

In the above technical solution, further, the limiting mechanism includes a vacuum adsorption hole provided on the sheet-type printing table and acting on the microporous layer, and an air pipe connected to a vacuum-pumping fan; the limiting mechanism further comprises an electromagnetic plate which is arranged in the thin plate type printing table and adsorbs the transmission steel belt.

In the above technical solution, further, a dehumidifying device in signal connection with the Plc system circuit is disposed on the rotating table, and the dehumidifying device includes a plurality of pumping blade openings arranged along the circumferential array of the rotating table; still be equipped with the water tank in the dehydrating unit, the water tank divide into two stock solution chambeies, and one of them stock solution chamber is connected with dehydrating unit and is supplied water liquid storage, and another stock solution intracavity storage has the coolant liquid to the cooling platform circulation feed.

In the above technical scheme, further, the inner wall of the sheet type printing table is filled with a heat conduction silica gel layer.

In the above technical solution, further, the number of the screen printing devices on each transfer mechanism is: 1 to 3.

In another aspect, the present invention provides a continuous printing process for microporous layers of multi-specification fuel cells, which comprises the following steps:

s1, placing the microporous layer in the limiting grooves (2-1) of the two conveying mechanisms (2) respectively to wait for conveying, controlling time difference conveying of the two conveying mechanisms (2) by a timing module of a Plc system, simultaneously enabling the heating table (4-1) to reach a heating temperature, and not starting the cooling table (4-2), wherein the heating table (4-1) and the cooling table (4-2) are both far away from the sheet type printing table (1-2);

s2, sequentially conveying the microporous layers to a sheet type printing table (1-2) of the screen printing device (1) by a first conveying mechanism (2), and stopping conveying after a sensor (1-1) in each screen printing device (1) on the conveying mechanism (2) senses the microporous layers;

s3, the sheet type printing table (1-2) realizes vacuum adsorption on the microporous layer and electromagnetic adsorption on the conveying steel belt (2-2);

s4, the screen printing device (1) on the first strip conveying mechanism (2) realizes the first printing work of the microporous layer, and meanwhile, the second strip conveying mechanism (2) starts conveying;

s5, the rotating table (4) controls the heating table (4-1) to respectively convey and attach to the bottom of each sheet type printing table (1-2) in the first conveying mechanism (2), and the microporous layer after the step S4 is dried is realized;

s6, the rotating table (4) controls the cooling table (4-2) to respectively convey and attach to the bottom of the thin plate type printing table (1-2) of each screen printing device (1) in the first conveying mechanism (2), and cooling of the thin plate type printing table (1-2) is achieved;

s7, after the step S6 is completed, the laser thickness detector (6) detects the thickness of the microporous layer on the first conveying mechanism (2), if the thickness of the microporous layer does not meet the thickness requirement, the microporous layer can be directly printed again, and the steps S5-S6 are repeated after printing, so that the processes of printing, drying, cooling and detecting are carried out for multiple times until the laser thickness detector (6) detects the microporous layer meeting the thickness requirement;

s8, the second conveying mechanism (2) repeats the same printing-drying-cooling-detecting procedures on the first conveying mechanism (2) for a plurality of times until the laser thickness detector (6) detects the microporous layer meeting the thickness requirement.

In the above technical solution, further, before the cooling table in step S6 is transferred to a position under the sheet printing table of the outer screen printing device to achieve cooling, the sheet printing table cancels the electromagnetic adsorption to the transfer steel belt, and the dehumidifying device operates at the same time.

In the above technical solution, the heating time in step S5 is 20-40S, and the cooling time in step S6 is 20-40S.

Compared with the prior art, the invention has the beneficial effects that:

1. the equipment adopts two parallel conveying mechanisms with screen printing devices, a rotating table is arranged between the conveying mechanisms, a heating table and a cooling table are arranged on the rotating table, the heating table and the cooling table are driven to be respectively and alternately conveyed to the screen printing devices of the two conveying mechanisms through the rotation of the rotating table, so that the multiple continuous processes of printing, drying and cooling of microporous layers on one screen printing device can be realized, the problems of large requirement on the quantity of drying ovens and large occupied area of a field are solved, each screen printing device is in signal connection with a Plc system circuit of the equipment, the independent control of the printing process of each screen printing device can be realized, and the thickness monitoring of a laser thickness detector is combined, so that the printing process can be timely supplemented and brushed to meet the requirement on the share thickness according to the printing condition in the whole printing process aiming at the same microporous layer, or the printing is stopped in time, so that the excess phenomenon is avoided, and the equipment at least completes the printing preparation of two gas diffusion layers in one working procedure, thereby having higher working efficiency;

in addition, the cooling table is arranged for cooling the sheet type printing table, so that the phenomenon that the slurry is dried and solidified too early to cause printing failure in the next printing process of the microporous layer by the sheet type printing table which is always at a high temperature is avoided;

2. the conveying mechanism of the equipment is internally provided with a conveying steel belt filled with iron powder, so that a better hardness supporting effect is achieved when the microporous layer is printed, the printing support of the microporous layer is further achieved after the electromagnetic adsorption of a sheet type printing table on the conveying steel belt is combined, meanwhile, the vacuum adsorption acting on the microporous layer is also arranged in the sheet type printing table, the printing positioning of the microporous layer is achieved, a complex auxiliary clamp is not needed, and the continuous printing is achieved;

3. the equipment is also provided with a dehumidifying device, and a plurality of air exhaust blade openings are arranged along the circumferential array of the rotating table, so that the surrounding working environment can be dehumidified comprehensively at 360 degrees, and the problems that water drops are condensed on a dried and cooled sheet type printing table and the surrounding air is excessively humid, so that the printing slurry of the microporous layer is diluted, and the quality of a gas diffusion layer is influenced are avoided;

4. the cooling liquid supplied by the cooling platform is stored in a water tank in the dehumidifying device, namely, the cooling liquid and the water tank are integrated and arranged on the rotating platform, so that the occupied area is reduced;

5. the heat-conducting silica gel layer is filled on the inner wall of the sheet type printing table, so that the drying of the microporous layer by the heating table is facilitated, and the cooling of the sheet type printing table by the cooling table is facilitated;

6. in the intelligent continuous printing process of the microporous layer of the multi-specification fuel cell, the timing module in the Plc system controls the time difference transmission of two transmission mechanisms, so that the phenomenon that the other microporous layer waiting for printing is too early in humid air due to misoperation of a cooling table is avoided;

7. in the intelligent continuous printing process of the microporous layer of the multi-specification fuel cell, before the cooling table cools the sheet-type printing table, the sheet-type cooling table is controlled to remove the adsorption of the conveying steel strip, so that a gap is formed between the conveying steel strip and the sheet-type cooling table, and the phenomenon that the microporous layer is directly cooled by the cooling table to generate water condensation and influence a printing layer of the microporous layer is effectively avoided.

Drawings

FIG. 1 is a schematic view of the entire mechanism of the present apparatus;

FIG. 2 is a schematic view of the internal structure of the sheet-type printing table;

FIG. 3 is a schematic structural view of a rotary table or the like in the present apparatus;

fig. 4 is a schematic diagram of plc system connection in the present apparatus;

fig. 5 is a flow chart of the intelligent continuous printing process of the microporous layer of the multi-specification fuel cell.

In the figure: 1. a screen printing device; 1-1, a sensor; 1-2, a sheet type printing table; 1-2-1, a heat-conducting silica gel layer; 2. a transport mechanism; 2-1, a limiting groove; 2-2, conveying a steel belt; 2-3, adsorbing through holes; 3. a limiting mechanism; 3-1, vacuum adsorption holes; 3-2, trachea; 3-3, electromagnetic plates; 4. a rotating table; 4-1, heating table; 4-2, cooling the table; 5. a dehumidifying device; 5-1, an air exhaust blade opening; 5-2, a water tank; 5-2-1, a liquid storage cavity; 6. laser thickness detector.

Detailed Description

The invention is further illustrated but is not in any way limited by the following specific examples.

Example 1

An intelligent continuous printing device for microporous layers of multi-specification fuel cells comprises a plurality of screen printing devices 1, wherein each screen printing device 1 adopts a screen printing machine, each screen printing machine also comprises a thin plate type printing table 1-2, a sensor 1-1 for identifying the microporous layers and a laser thickness detector 6, and the sensor 1-1 adopts a distance sensor 1-1; the intelligent continuous printing equipment for the microporous layer further comprises the following devices:

as shown in fig. 1, two parallel conveying mechanisms 2, the conveying mechanism 2 includes a conveying steel belt 2-2 filled with iron powder inside, and a driving member (not shown in the figure) such as a servo motor for driving the conveying steel belt 2-2 to make a rotary conveying motion, the conveying steel belt 2-2 is provided with a plurality of limiting grooves 2-1 for embedding the microporous layer along a conveying direction array, when the microporous layer is embedded in the limiting grooves 2-1, the upper surface of the microporous layer is flush with the upper surface of the conveying mechanism 2, and a plurality of adsorption through holes 2-3 are arranged in the limiting grooves 2-1 array.

As shown in fig. 1, the transfer mechanism 2 realizes the transfer of the microporous layer, and each transfer mechanism 2 is provided with n screen printing devices 1, where n is equal to or greater than 1 and equal to or less than 3, in this embodiment, n is equal to 2, each transfer mechanism 2 simultaneously penetrates through the upper side of the thin plate printing table 1-2 of 2 screen printing devices 1 to realize the transfer of the microporous layer to the screen printing device 1, the 2 screen printing devices 1 on the two transfer mechanisms 2 are oppositely arranged in pairs, and the distance between every two limiting grooves 2-1 on each transfer mechanism 2 is equal to the distance between the sensors 1-1 in the two adjacent screen printing devices 1 on the transfer mechanism 2, so as to ensure that when the sensors 1-1 simultaneously sense two microporous layers, after the servo motor controls the transfer steel belt 2-2 to stop transferring, the microporous layer on each transfer mechanism 2 is just transferred to the medium plate printing table 1 of the two screen printing devices 1 2, at a position directly above.

A limiting mechanism 3, as shown in figures 1 and 2, the limiting mechanism 3 comprises a vacuum adsorption hole 3-1 which is arranged on a sheet type printing table 1-2 and acts on the microporous layer and an air pipe 3-2 which is connected with a fan for vacuumizing, an electromagnetic plate 3-3 which is arranged in the sheet type printing table 1-2 and adsorbs a conveying steel belt 2-2 is arranged in the sheet type printing table 1-2 to limit the microporous layer, that is, when the microporous layer is transferred to the right above the sheet type printing table 1-2, the transfer mechanism 2 stops the transfer, and by operating the fan for vacuum-pumping, can realize the vacuum adsorption positioning of the microporous layer, the electromagnetic plate 3-3 can realize the electromagnetic adsorption of the conveying steel belt 2-2, so that the conveying steel belt 2-2 is attached to the surface of the sheet type printing table 1-2, and the sheet type printing table 1-2 realizes the printing support of the microporous layer.

A rotary table 4 which is driven to rotate by a driving mechanism, i.e., a driving motor, etc., as shown in fig. 1, the rotary table 4 is disposed between the two conveying mechanisms 2, as shown in fig. 3, the rotary table 4 is provided with 2 heating tables 4-1 and 2 cooling tables 4-2 which can contact the bottoms of the sheet type printing tables 1-2, the heating tables 4-1 and the cooling tables 4-2 are disposed symmetrically along the center of the rotary table 4, and when the heating table 4-1 is disposed at the bottom of the sheet type printing table 1-2 in one conveying mechanism 2, the bottom of the sheet type printing table 1-2 of the other conveying mechanism 2 is the cooling table 4-2, as shown in fig. 1; the rotating platform 4 is provided with a circuit control system which respectively controls the heating platform 4-1 and the cooling platform 4-2 to work; the number of the rotating platforms 4 is not limited, and a plurality of rotating platforms 4 can be arranged between two parallel conveying mechanisms 2 according to actual requirements.

The dehumidifier comprises a dehumidifier device 5, the dehumidifier device 5 is arranged on the rotating platform 4, namely the dehumidifier, the dehumidifier device 5 comprises a plurality of air exhaust blade openings 5-1 arranged along the circumference of the rotating platform 4 in an array manner, a water tank 5-2 is also arranged in the dehumidifier device 5, the water tank 5-2 is divided into two liquid storage cavities 5-2-1, one liquid storage cavity 5-2-1 is connected with the dehumidifier device 5 for storing water, and the other liquid storage cavity 5-2-1 stores cooling liquid for circularly supplying materials to the cooling platform 4-2, as shown in fig. 1 and 3.

The Plc system is in circuit signal connection with the screen printing devices 1 respectively to realize individual control of the screen printing devices 1, and is in circuit signal connection with the sensor 1-1, the conveying mechanism 2, the limiting mechanism 3, the driving mechanism, the circuit control system, the dehumidifying device 5 and the laser thickness detector 6, and based on the requirements of the invention, the Plc system can realize software programming and is recorded in the device in advance, the working sequence of the devices, the mechanisms and the system is guided by a logical operation function in the Plc system, and the Plc system further comprises a display screen and a timing module in the Plc system, wherein the display screen is used for displaying the working state of each component, and the timing module is used for controlling the two conveying mechanisms 2 to realize the conveying with time difference, as shown in fig. 4.

The heat-conducting silica gel layer 1-2-1 is filled in the inner wall of the thin plate type printing table 1-2 as shown in figure 2, and has good heat-conducting property.

The invention also provides an intelligent continuous printing process for the microporous layer of the multi-specification fuel cell, as shown in fig. 5, the process comprises the following steps:

step (1), the microporous layer is respectively placed in the limiting grooves 2-1 of the two conveying mechanisms 2 to wait for conveying, the timing module of the plc system controls the time difference conveying of the two conveying mechanisms 2, meanwhile, the circuit control system controls the heating table 4-1 to reach the heating temperature, the heating temperature is set to be 250-.

And (2) sequentially conveying the microporous layers to a sheet type printing table 1-2 of the screen printing device 1 by a first strip conveying mechanism 2, and stopping conveying of the conveying mechanism 2 after the sensor 1-1 on each screen printing device 1 on the strip conveying mechanism 2 senses the microporous layers.

And (3) the sheet type printing table 1-2 realizes vacuum adsorption on the microporous layer and electromagnetic adsorption on the conveying steel belt 2-2.

And (4) the screen printing device 1 on the first strip conveying mechanism 2 realizes the first printing work on the microporous layer, and meanwhile, the second strip conveying mechanism 2 starts conveying.

And (5) respectively conveying and adhering the heating table 4-1 to the bottom of each sheet type printing table 1-2 in the first conveying mechanism 2 by the rotating table 4 for 20-40s, drying the microporous layer after the step (4) in the embodiment after 30s, conveying the microporous layer on the second conveying mechanism 2 to the position right above the sheet type printing table 1-2 of each screen printing device 1 and completing printing in the process, wherein the cooling table 4-2 is also adhered to the position below the sheet type printing table 1-2 of the second conveying mechanism 2 at the moment, but the cooling table 4-2 is not opened and a cooling process is not carried out.

And (6) the sheet type printing table 1-2 on the first conveying mechanism 2 cancels electromagnetic adsorption on the conveying steel belt 2-2, so that a gap exists between the conveying steel belt 2-2 with the microporous layer and the sheet type printing table 1-2, the rotating table 4 starts to rotate, and meanwhile, the cold area table and the dehumidifying device 5 are opened.

And (7) rotating the rotating table 4 to enable the cooling table 4-2 to respectively convey and adhere to the bottoms of the sheet type printing tables 1-2 of the screen printing devices 1 in the first strip conveying mechanism 2 for 20-40s, in the embodiment, cooling the sheet type printing tables 1-2 after the step (6) is completed after 30s, and meanwhile, conveying and adhering the heating table 4-1 on the rotating table 4 to the bottoms of the sheet type printing tables 1-2 of the screen printing devices 1 in the second strip conveying mechanism 2 to heat and dry the microporous layers printed on the second strip conveying mechanism 2.

Step (8), the laser thickness detector 6 detects the thickness of the microporous layer on the first conveying mechanism 2, if the microporous layer does not meet the thickness requirement, the printing can be directly carried out again, and the steps (5) to (7) are repeated after the printing, so that the processes of printing, drying and cooling are carried out for multiple times until the laser thickness detector 6 detects the microporous layer meeting the thickness requirement; if the thickness requirement is met, the printing device is in the original position to wait for the printing of the microporous layer which does not meet the thickness requirement to be completed, and then batch transmission and collection are realized, and meanwhile, the electromagnetic adsorption on the transmission steel belt 2-2 and the vacuum adsorption on the microporous layer are cancelled by the sheet type printing table 1-2 on the screen printing device 1; in the detection process, the electromagnetic adsorption on the conveying steel belt 2-2 is removed by the sheet type printing table 1-2 on the second strip conveying mechanism 2, and the rotating table 4 rotates to enable the cooling table 4-2 to be attached to the bottom of the sheet type printing table 1-2 on the second strip conveying mechanism 2 to cool the sheet type printing table 1-2.

Step (9), after the cooling process is completed on the second transport mechanism 2, the laser thickness detector 6 detects the thickness of the microporous layer on the second transport mechanism 2, if the thickness of the microporous layer is not qualified, the microporous layer can be directly printed again, and the steps (5) to (7) are repeated after the printing, so that the printing-drying-cooling process is performed for multiple times until the laser thickness detector 6 detects the microporous layer which is qualified for the thickness; and the printing table 1-2 on the screen printing device 1 cancels the electromagnetic adsorption on the conveying steel belt 2-2 and the vacuum adsorption on the microporous layer.

It will be apparent to those skilled in the art from this disclosure that many changes and modifications can be made, or equivalents modified, in the embodiments of the invention without departing from the scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.

Claims

1. The intelligent continuous printing equipment for the microporous layer of the multi-specification fuel cell comprises a screen printing device (1) and a Plc system, and is characterized in that: the screen printing devices (1) each comprise a sheet-type printing table (1-2) and a sensor (1-1) for identifying a microporous layer; the intelligent continuous printing equipment for the microporous layer further comprises the following devices:

the screen printing device comprises two parallel conveying mechanisms (2), wherein a plurality of screen printing devices (1) are oppositely arranged on each conveying mechanism (2) in pairs, and each conveying mechanism (2) simultaneously penetrates through the upper parts of the thin plate type printing tables (1-2) of the plurality of screen printing devices (1) to convey the microporous layer to the screen printing devices (1); the conveying mechanism (2) is provided with limiting grooves (2-1) for embedding the microporous layer in an array mode, and when the microporous layer is embedded in the limiting grooves (2-1), the upper surface of the microporous layer is flush with the upper surface of the conveying mechanism (2); the distance between every two limiting grooves (2-1) on each conveying mechanism (2) is equal to the distance between the sensors (1-1) in two adjacent screen printing devices (1) on the conveying mechanism (2);

the limiting mechanism (3) is arranged in the sheet type printing table (1-2) and used for limiting the microporous layer;

the rotary table (4) is driven by a driving mechanism, the rotary table (4) is arranged between the two conveying mechanisms (2), the rotary table (4) is provided with a plurality of heating tables (4-1) and cooling tables (4-2) which can be contacted with the bottoms of the sheet type printing tables (1-2), and the heating tables (4-1) and the cooling tables (4-2) are symmetrically arranged along the center point of the rotary table (4);

the laser thickness detector (6) is arranged on each screen printing device (1) and is used for detecting the thickness of the microporous layer which is printed each time;

each screen printing device (1), the sensor (1-1), the conveying mechanism (2), the limiting mechanism (3), the driving mechanism and the laser thickness detector (6) are in signal connection with a circuit of a Pluc system, and the Pluc system comprises a timing module which is used for controlling the two conveying mechanisms (2) to realize conveying with time difference.

2. The intelligent continuous printing equipment for the microporous layer of the multi-specification fuel cell according to claim 1, wherein: the conveying mechanism (2) comprises a conveying steel belt (2-2) filled with iron powder; the conveying steel belt (2-2) is positioned in the limiting groove (2-1), and a plurality of adsorption through holes (2-3) are arranged in an array.

3. The intelligent continuous printing equipment for the microporous layer of the multi-specification fuel cell according to claim 2, wherein: the limiting mechanism (3) comprises a vacuum adsorption hole (3-1) which is arranged on the sheet type printing table (1-2) and acts on the microporous layer and an air pipe (3-2) connected with a fan for vacuumizing; the limiting mechanism (3) further comprises an electromagnetic plate (3-3) which is arranged in the thin plate type printing table (1-2) and adsorbs the conveying steel belt (2-2).

4. The intelligent continuous printing equipment for the microporous layer of the multi-specification fuel cell according to claim 1, wherein: the rotating platform (4) is provided with a dehumidifying device (5) in signal connection with a Plc system circuit, and the dehumidifying device (5) comprises a plurality of air pumping blade openings (5-1) arranged along the circumference of the rotating platform (4) in an array manner; the dehumidifying device (5) is internally provided with a water tank (5-2), the water tank (5-2) is divided into two liquid storage cavities (5-2-1), one of the liquid storage cavities (5-2-1) is connected with the dehumidifying device (5) for storing water supply, and the other liquid storage cavity (5-2-1) is internally stored with cooling liquid for circularly supplying materials to the cooling platform (4-2).

5. The intelligent continuous printing equipment for the microporous layer of the multi-specification fuel cell according to claim 1, wherein: the inner wall of the sheet type printing table (1-2) is filled with a heat conduction silica gel layer (1-2-1).

6. The intelligent continuous printing equipment for the microporous layer of the multi-specification fuel cell according to claim 1, wherein: the number of the screen printing devices (1) on each conveying mechanism (2) is as follows: 1 to 3.

7. An intelligent continuous printing process for a multi-gauge fuel cell microporous layer, using the apparatus of any of claims 1-6, wherein the process comprises the steps of:

8. The continuous printing process of microporous layers of a multi-gauge fuel cell according to claim 7, wherein: before the cooling table (4-2) in the step S6 is conveyed to the position below the thin plate printing table of the outer screen printing device to realize cooling, the thin plate printing table cancels the electromagnetic adsorption on the conveying steel belt (2-2) and the dehumidifying device (5) works at the same time.

9. The continuous printing process of microporous layers of a multi-gauge fuel cell according to claim 7, wherein: the heating time is 20-40S in step S5, and the cooling time is 20-40S in step S6.