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CN-121988476-A - Automatic feeding and detecting system for polar plate of phosphoric acid fuel cell

CN121988476ACN 121988476 ACN121988476 ACN 121988476ACN-121988476-A

Abstract

The invention discloses an automatic feeding and detecting system for a polar plate of a phosphoric acid fuel cell, and belongs to the technical field of fuel cell manufacturing. The system comprises a feeding module, a charging and conveying module, a front-rear weight detection module, a graphite slurry spraying module, a drying module, a visual detection module, a NG sorting module and a control module which are sequentially connected along a process path. The loading and conveying device adopts a carrier integrating a vacuum adsorption platform and a turnover type mechanical shielding component, is matched with a mechanical guide rail component, drives the shielding component to automatically open and close by utilizing relative motion in the conveying process, and performs physical sealing shielding on a center adhesive tape pasting area of a cooling plate. The control module calculates the coating net weight based on the weight difference before and after spraying, performs quality sorting by combining the visual image analysis result, and performs closed-loop feedback adjustment on the spraying parameters by utilizing a PID algorithm. The invention realizes automatic shielding and full-flow online monitoring, and solves the problems of low manual shielding efficiency and poor coating consistency.

Inventors

  • LU CONG

Assignees

  • 中科润谷智慧能源科技(佛山)有限公司

Dates

Publication Date
20260508
Application Date
20260210

Claims (10)

  1. 1. The automatic feeding and detecting system for the phosphoric acid fuel cell polar plate is characterized by comprising a feeding device, a loading conveying device, a front weight detecting device, a graphite slurry spraying device, a drying device, a rear weight detecting device, a visual detecting module, a NG product conveying device and a control module; The material loading and conveying device is configured as a logistics carrier of the system and comprises a circulating conveying assembly, a plurality of carriers and a mechanical guide rail assembly, wherein the circulating conveying assembly drives the plurality of carriers to move along a process path; the carrier comprises a base, a vacuum adsorption platform arranged at the top of the base and a turnover mechanical shielding assembly arranged at the side edge of the base; The mechanical guide rail assembly is arranged in an operation area of the graphite slurry spraying device, the mechanical guide rail assembly is mechanically matched with the moving carrier, the mechanical guide rail assembly presses the turnover mechanical shielding assembly to switch from an open state to a closed state, the turnover mechanical shielding assembly performs physical covering on a tape pasting area at the center of a cooling plate arranged on the vacuum adsorption platform, and the mechanical guide rail assembly releases the pressing after the carrier is driven out of the drying device, so that the turnover mechanical shielding assembly is restored to the open state.
  2. 2. The automated phosphoric acid fuel cell plate loading and testing system of claim 1, wherein the reversible mechanical shielding assembly comprises a rotating arm, a shielding platen, a trigger roller, and a reset spring The shielding pressing plate is connected to the tail end of the rotating arm, and the triggering roller is rotationally connected to the outer side surface of the rotating arm; The mechanical guide rail assembly comprises an introduction section, a pressure maintaining section and a discharge section, wherein the introduction section is provided with a cam curved surface which gradually descends, the introduction section is used for pressing the trigger roller downwards against the torsion force of the reset elastic piece to drive the rotating arm to turn inwards, the pressure maintaining section is a horizontal straight line plane, and the pressure maintaining section is used for keeping the shielding pressing plate pressed on the adhesive tape pasting area in the center of the cooling plate.
  3. 3. The automatic feeding and detecting system for the phosphoric acid fuel cell polar plate, which is disclosed in claim 2, is characterized in that a flexible sealing gasket is arranged on the lower surface of the shielding pressing plate, the flexible sealing gasket is made of silica gel or fluororubber, and when the shielding pressing plate is in a closed state, the flexible sealing gasket is elastically deformed and is tightly attached to the edge of the adhesive tape sticking area of the cooling plate, so that liquid-tight sealing is formed.
  4. 4. The automatic feeding and detecting system for the phosphoric acid fuel cell polar plates, according to claim 1, is characterized in that a vacuum pipeline and a vacuum one-way valve are arranged in a base of the carrier, one end of the vacuum pipeline is communicated with an adsorption hole on the surface of the vacuum adsorption platform, and the other end of the vacuum pipeline extends to the side surface of the base to form a butt joint interface; The charging conveying device is provided with a telescopic pneumatic butt joint at the side of the charging station, the telescopic pneumatic butt joint is used for being inserted into the butt joint interface and pushing up the vacuum one-way valve to conduct the air passage, and the vacuum one-way valve is used for automatically closing the air passage when the telescopic pneumatic butt joint is retracted and separated, so that the negative pressure state in the vacuum pipeline is maintained.
  5. 5. The automatic feeding and detecting system for the phosphoric acid fuel cell polar plates, according to claim 1, is characterized in that the upper surface of the vacuum adsorption platform is provided with concentric or grid-shaped air guide grooves, adsorption holes are distributed at the junction of the air guide grooves, and the surface of the vacuum adsorption platform, which is contacted with the cooling plate, is embedded with a high-temperature-resistant rubber anti-slip pad.
  6. 6. The automatic feeding and detecting system for the phosphoric acid fuel cell polar plates, according to claim 1, is characterized in that the feeding device is configured to perform grabbing and protective liner removing actions of the cooling plates, and the stripping mechanism integrated at the tail end of the feeding device comprises a stripping clamping jaw and a waste material rolling wheel; The operation area of the feeding device is provided with a static eliminating component, and an air outlet of the static eliminating component is aligned with a separation point of the cooling plate and the protective liner to spray ion air flow.
  7. 7. The automated phosphoric acid fuel cell plate loading and detection system of claim 1, wherein the control module is configured to operate a closed loop feedback algorithm, wherein the control module calculates a net weight arithmetic average of the continuous N acceptable products, wherein if the net weight arithmetic average is less than a weight target value, the control module outputs an increment signal to the graphite slurry spraying device via a PID algorithm to increase the supply pressure or the pump speed, and wherein if the net weight arithmetic average is greater than the weight target value, the control module outputs a decrement signal to decrease the supply pressure or the pump speed.
  8. 8. The automatic feeding and detecting system for the phosphoric acid fuel cell polar plates, according to claim 1, is characterized in that the weight detecting device comprises a transfer module, a weighing sensor and a vibration isolation base; The load transfer module spans and is arranged above the loading and conveying device, the load transfer module is configured to move the cooling plate out of the carrier and place the cooling plate on the weighing sensor, and move the cooling plate back to the carrier after the measurement is finished, the weighing sensor is arranged on the vibration isolation base, a bearing disc of the weighing sensor is not in mechanical contact with the loading and conveying device, and a wind shield is covered outside the weighing sensor.
  9. 9. The automatic feeding and detecting system for the phosphoric acid fuel cell polar plates is characterized in that the visual detecting module comprises an industrial camera and an image processing unit, wherein the image processing unit defines a first detecting area and a second detecting area in image data, the first detecting area covers a graphite slurry spraying area of a cooling plate, the image processing unit adopts a background difference method or a Blob analysis algorithm to identify defects for the first detecting area, the second detecting area covers a tape pasting area in the center of the cooling plate, and the image processing unit adopts a Canny edge extraction algorithm to detect gradient changes of edges of the tape area for the second detecting area to judge whether graphite slurry residues exist.
  10. 10. The automatic feeding and detecting system for the phosphoric acid fuel cell polar plates is characterized in that each station node of a charging conveying device is provided with an RFID reader-writer, an RFID electronic tag is arranged in a carrier, a control module establishes an association record of the RFID electronic tag ID and a current cooling plate in a database, and the association record is used for storing front weight data, post-spraying weight data, coating net weight data and visual detection judging results of the cooling plate.

Description

Automatic feeding and detecting system for polar plate of phosphoric acid fuel cell Technical Field The invention relates to the technical field of fuel cell manufacturing, in particular to an automatic feeding and detecting system for a polar plate of a phosphoric acid fuel cell. Background The cooling plate of proton exchange membrane fuel cell generally needs to be subjected to surface graphite slurry spraying treatment in the manufacturing process so as to improve the conductivity and corrosion resistance of the cooling plate. Before the spraying process is performed, specific areas of the surface of the cooling plate (such as the center for taping) need to be kept blank in order to meet the assembly requirements or electrical connection requirements of the subsequent components, and no graphite coating should be attached. Therefore, effective shielding of the non-sprayed areas of the cooling panels is an essential process step in an automated spray line. The existing shielding process mainly relies on manual pasting of high-temperature resistant adhesive tapes or the use of an independent off-line shielding tool for protection. The operation mode forces the continuous spraying production line to be interrupted in a shielding link, so that discontinuous breakpoint type processing is formed, and the production beat of the whole line is greatly limited. When the shielding is carried out by means of manual work or off-line tools, the relative position precision of the shielding medium and the cooling plate is difficult to maintain high consistency, the phenomenon of deviation of a shielding area or blurring of edges is easy to occur, the rigid contact surface of the simple tool cannot form reliable sealing under spraying pressure, slurry is led to permeate into a non-spraying area through gaps, and product appearance defects or functional failures are caused. Disclosure of Invention At present, in the production and manufacture of fuel cell polar plates, the preparation of the surface coating of the cooling plate has the problems of discontinuous process and insufficient degree of automation. For the cooling plate needing to keep blank in the center tape pasting area, the prior art mostly adopts manual pasting of shielding tape or uses an independent off-line shielding jig. The sectional type operation reduces the production efficiency, and the edge consistency of a shielding area is poor easily caused by manual operation or jig positioning deviation, so that coating leakage is generated. In addition, the prior art lacks real-time on-line monitoring of coating weight and surface quality, and cannot adjust process parameters in real time according to detection results in the production process. The automatic feeding and detecting system for the phosphoric acid fuel cell polar plate realizes automatic physical shielding and closed-loop detection of the cooling plate in the conveying process through the matching of the charging conveying device and the mechanical guide rail component. The invention provides an automatic feeding and detecting system for a polar plate of a phosphoric acid fuel cell, which comprises a feeding device, a feeding conveying device, a weight detecting device, a graphite slurry spraying device, a drying device, a visual detecting module, a NG product conveying device and a control module which are sequentially connected along a process path. The charging and conveying device comprises a circulating and conveying assembly, a plurality of carriers and a mechanical guide rail assembly, wherein the circulating and conveying assembly drives the plurality of carriers to move along a process path. The carrier comprises a base, a vacuum adsorption platform arranged at the top of the base and a turnover mechanical shielding assembly arranged at the side edge of the base. The mechanical guide rail component is arranged in an operation area of the graphite slurry spraying device. The mechanical guide rail component is configured to be mechanically matched with the moving carrier, the relative motion of the carrier and the mechanical guide rail component is utilized to press the turnover mechanical shielding component to switch from an open state to a closed state, so that the turnover mechanical shielding component can physically cover a tape pasting area at the center of a cooling plate placed on the vacuum adsorption platform, and the mechanical guide rail component releases the pressing after the carrier exits from the graphite slurry spraying device, so that the turnover mechanical shielding component is restored to the open state. Further, the turnover type mechanical shielding assembly comprises a rotating arm, a shielding pressing plate, a triggering roller and a resetting elastic piece. The rotating arm is hinged to the base through a rotating shaft, and the reset elastic piece applies torsion to maintain the trend that the rotating arm is opened outwards. The shielding pressing plate is