Adsorption tool with runner electrode plate and working method

Abstract

The present application relates to the technical field of liquid flow battery production, in particular to an adsorption tool with a flow channel electrode plate and a working method. The adsorption tool comprises: a suction cup frame, a suction cup is installed on the suction cup frame; the suction cup is provided with a flat working surface at the bottom, and a plurality of negative pressure adsorption ports for adsorbing the electrode plate are arranged on the working surface; at least one compensation nozzle is arranged on the working surface, and the compensation nozzle is aligned with the through hole of the electrode plate. The working method comprises the following steps: a, the adsorption tool moves directly above the electrode plate to be adsorbed; b, the negative pressure adsorption port maintains a negative pressure adsorption state, and the working surface at the bottom of the suction cup is in contact with the electrode plate to be adsorbed; c, the adsorption tool moves to a release station; d, the negative pressure adsorption port releases the negative pressure, releases the adsorbed electrode plate, and opens the compensation nozzle. Through the above setting, the pressure below the electrode plate can be compensated without changing the servo system and the release height of the electrode plate, and the falling speed of the electrode plate is slowed down to protect the electrode plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid flow battery production, in particular to an adsorption tool with a flow channel electrode plate and a working method. BACKGROUND

[0002] Electrode plates are commonly used in fuel cells, electrolytic cells, and liquid flow batteries, which require uniform distribution of gases or liquids. Typical examples include proton exchange membrane fuel cells (PEMFC), solid oxide fuel cells (SOFC), water electrolysis for hydrogen production (PEM electrolysis cell, alkaline electrolysis cell), and all-vanadium redox flow batteries (VRFB).

[0003] Electrode plates are usually made of porous carbon materials or their composites. Common materials include:

[0004] Carbon fiber felt: a soft carbon-based material with a large specific surface area and good electrical conductivity. Its porous structure is conducive to the flow of electrolyte and ion exchange.

[0005] Graphite felt: similar to carbon fiber felt, but with a higher degree of graphitization, better electrical conductivity and corrosion resistance. High degree of graphitization helps improve electrochemical performance.

[0006] Carbon paper: flat surface, high mechanical strength, suitable for some high-performance liquid flow batteries. Good electrical conductivity, but smaller specific surface area.

[0007] Activated carbon-coated electrode: a layer of activated carbon is coated on the surface of the carbon-based material to further increase the specific surface area and catalytic activity.

[0008] Composite materials: introduce metal oxides, polymers or other conductive additives into the carbon-based material to improve performance.

[0009] Electrode plates are provided with flow channels for transporting reaction media or delivering reaction gases (such as hydrogen, oxygen or air) to the electrode catalyst layer while removing byproducts (water) generated by the reaction. Common designs for flow channels on the surface of the electrode plate include straight lines, serpentine, grid, diamond, etc. The design needs to be optimized according to specific applications. Flow channel design can ensure uniform flow of electrolyte on the electrode surface, promote efficient exchange of reaction materials, optimize fluid distribution, reduce local concentration polarization, and improve battery performance. Therefore, the integrity of the flow channel structure will affect the functional integrity of the battery and battery performance.

[0010] The electrochemical reaction in the battery occurs on the surface of the electrode, so in order to maximize the specific surface area, the electrode plate is usually processed into a very thin sheet. But reducing the thickness of the electrode plate will lead to the decrease of its own mechanical strength. Therefore, additional protection is needed for the electrode plate during the processing and assembly process. During assembly, the electrode frame is added to the electrode plate, and the electrode frame bears the extrusion prestress of the electrode stack to prevent leakage, and protects the electrode plate from being damaged by pressure. During processing, the electrode plate needs to be transferred between different workstations, and mechanical fixtures are avoided during transfer, and more suction cup fixtures with less stress on the workpiece are used.

[0011] Using suction cup fixtures to transfer and stack electrode plates still has a certain probability of damaging the electrode plates. After the flow channel is processed on the electrode plate, the flow channel of the electrode plate may be damaged or scratched. SUMMARY

[0012] The purpose of the present application is to overcome the problem of easily damaging the flow channel of the electrode plate during the release of the electrode plate with the suction cup fixture. The present application provides an adsorption fixture for electrode plates with flow channels, which can form an air cushion for gas compensation during the release of the electrode plate, slow down the falling speed of the electrode plate, and avoid damage to the electrode plate.

[0013] To achieve the above purpose, the first aspect of the present application provides an adsorption fixture for electrode plates with flow channels, comprising: a suction cup holder connected to a servo system, and a suction cup mounted on the suction cup holder; the suction cup has a flat working surface at the bottom, and a plurality of negative pressure suction ports for adsorbing the electrode plate are provided on the working surface; at least one compensation nozzle is provided on the working surface, and the compensation nozzle is aligned with the via of the electrode plate.

[0014] In some embodiments, the adsorption fixture further comprises an air flow switcher and a vacuum generator; the adsorption fixture has an adsorption station and a release station.

[0015] The air flow switcher can switch between the adsorption station and the release station; the air flow switcher is connected to a positive pressure gas source.

[0016] Adsorption station: the air flow from the positive pressure gas source is guided to the vacuum generator through the air flow switcher, the vacuum generator generates negative pressure and communicates with the negative pressure suction port through the air flow channel;

[0017] Release station: the air flow from the positive pressure gas source is guided to the compensation nozzle through the air flow switcher, and is sprayed from the compensation nozzle.

[0018] In some embodiments, the air flow switcher comprises an air inlet, a first air outlet, a second air outlet, a valve core and a driver.

[0019] The air inlet is communicated with a positive pressure source, the first air outlet is connected with a vacuum generator, and the second air outlet is connected with a compensation nozzle.

[0020] The driver drives the valve core to move to the adsorption station or the release station. When the valve core is in the adsorption station, the air inlet is communicated with the first air outlet and the second air outlet is closed. When the valve core is in the release station, the air inlet is communicated with the second air outlet and the first air outlet is closed.

[0021] In some embodiments, the air inlet is arranged on the chuck holder, the valve body of the air flow switch is mounted on the chuck, the valve core is arranged on the valve body and can slide up and down within a limited distance, and the top of the valve core is aligned with the gas outlet of the air inlet. A spring is arranged between the valve core and the valve body to support the valve core upward.

[0022] The valve core has an air flow channel, one end of the air flow channel is aligned with the gas outlet of the air inlet, and the other end is an air flow outlet. The gas outlet is communicated with the compensation nozzle.

[0023] A blocking structure is arranged on the valve body. The driver is fixed on the chuck holder, and the driving rod of the driver is connected with the chuck and drives the chuck to move.

[0024] In some embodiments, a blocking piece is arranged at the air flow outlet end of the valve core, and a through hole is formed in the circumferential surface of the bottom of the air flow channel to form the air flow outlet. The blocking structure includes a blocking ring arranged on the valve body, and the blocking ring surrounds the valve core.

[0025] When the valve core moves to the adsorption station, the blocking ring is aligned with and blocks the air flow outlet of the valve core. When the valve core moves to the release station, the blocking ring is misaligned with the air flow outlet, and the gas is sprayed from the air flow outlet and then flows to the compensation nozzle.

[0026] The compensation nozzle extends downward to form a working surface, and the compensation nozzle is inserted into the through hole of the electrode plate.

[0027] In some embodiments, the adsorption tool further includes a positive pressure ventilation pipe, one end of the positive pressure ventilation pipe is communicated with the negative pressure adsorption port, and the other end is aligned with the air flow outlet of the valve core air flow channel below the release station.

[0028] In some embodiments, the vacuum generator includes a main flow channel (7a) and a negative pressure flow channel. The inlet section of the main flow channel (7a) is connected with the air outlet of the adsorption station of the air flow switch. The main flow channel (7a) has a flow channel contraction part, side holes are formed in the side wall of the flow channel contraction part, one end of the negative pressure flow channel is connected to the side holes, and the other end is communicated with the negative pressure adsorption port.

[0029] The chuck has a pressure cavity, one end of the negative pressure flow channel away from the main flow channel (7a) is connected with the pressure cavity, and the negative pressure adsorption port is communicated with the pressure cavity.

[0030] In some embodiments, a plurality of negative pressure suction ports are arranged on the working surface, and several negative pressure suction ports are connected to the same pressure cavity, and a negative pressure maintaining valve is arranged in each negative pressure suction port.

[0031] The negative pressure maintaining valve comprises a stepped hole, a valve cover and an elastic member, the stepped hole has a small hole diameter in the upper hole section and a large hole diameter in the lower hole section, the valve cover has a larger diameter than the upper hole section and a smaller diameter than the lower hole section, the valve cover is arranged in the lower hole section through the elastic member, and a gap is reserved between the valve cover and the side wall of the lower hole section.

[0032] The external airflow flows into the pressure cavity through the negative pressure maintaining valve, and the valve cover tightly seals the stepped hole against the stepped hole shoulder by overcoming the elastic force of the elastic member.

[0033] In some embodiments, the adsorption tool further comprises a surrounding barrier arranged on the suction disc frame, the surrounding barrier is annular and surrounds the electrode plate, and a gap is reserved between the surrounding barrier and the edge of the electrode plate.

[0034] The surrounding barrier is arranged on the suction disc frame through a lifting driving assembly, and the lifting driving assembly drives the surrounding barrier to move up and down.

[0035] Meanwhile, the application also provides a working method of the adsorption tool, comprising the following steps:

[0036] a. The servo system drives the adsorption tool to move above the electrode plate to be adsorbed;

[0037] b. The negative pressure suction port maintains a negative pressure adsorption state, and the servo system drives the adsorption tool to move downward until the bottom working surface of the suction disc contacts the electrode plate to be adsorbed;

[0038] c. The negative pressure suction port maintains a negative pressure adsorption state, the adsorption tool carries the adsorbed electrode plate to move above the release station, and a gap is reserved between the adsorbed electrode plate and the electrode plate stacked below;

[0039] d. The negative pressure suction port releases the negative pressure to release the adsorbed electrode plate, and the compensation nozzle is opened;

[0040] The adsorbed electrode plate falls under the action of gravity, and the gas sprayed by the compensation nozzle enters the gap between the falling electrode plate and the electrode plate stacked below to form a high-pressure area to slow down the falling speed of the electrode plate;

[0041] e. After the falling electrode plate falls on the stacked electrode plate stack in step d, the compensation nozzle is closed, and the process returns to step a.

[0042] Further, the process from the adsorption station to the release station in step d comprises the following specific steps:

[0043] d-1, when the adsorption station, the valve core is supported by the spring to move to the upper stop point of the valve body, the gap between the top of the valve core and the outlet of the inlet channel, the gap forms the first outlet; gas flows through the first outlet to the vacuum generator, generates negative pressure and communicates with the negative pressure suction port through the airflow channel;

[0044] The sealing ring aligns and seals the gas flow outlet of the valve core, and compensates for the non-working state of the nozzle;

[0045] d-2, the driver drives the suction cup to move upward, the suction cup synchronously moves upward with the valve body and the valve core, and the top of the valve core abuts against the outlet of the inlet channel;

[0046] At this time, the gap between the valve core and the outlet of the inlet channel disappears, the first outlet is closed, the vacuum generator stops working, and the negative pressure suction port is removed;

[0047] d-3, the top of the valve core tightly abuts against the bottom of the inlet channel and no longer moves upward, the driver drives the suction cup and the valve body to continue moving upward, the valve core slides downward relative to the valve body, and the sealing ring is misaligned with the gas flow outlet of the valve core;

[0048] Part of the gas sprayed from the gas flow outlet of the valve core flows into the positive pressure ventilation pipe, and the negative pressure suction port appears positive pressure, so as to push the adsorbed electrode plate downward to separate from the working surface of the suction cup and fall under the action of gravity;

[0049] Another part of the gas sprayed from the gas flow outlet of the valve core flows to the compensation nozzle, the compensation nozzle starts to spray gas, and the gas sprayed from the compensation nozzle enters the gap between the falling electrode plate and the lower stacked electrode plate to form a high pressure area and slow down the falling speed of the electrode plate.

[0050] Problem: The material used for the electrode plate itself has low mechanical strength, and is a thin plate, so it is easy to be broken by stress perpendicular to the plate. In the traditional technology, when handling and releasing such brittle thin plates (such as wafers and solar cell plates), the adsorption tool releases the electrode plate at a distance of several centimeters from the bearing surface, which can ensure a high yield.

[0051] The material used for the electrode plate, such as carbon fiber felt and composite material, has higher mechanical strength than wafers and solar cell plates. Therefore, releasing the electrode plate from a height of several centimeters according to the traditional technical means should not damage the electrode plate. However, according to the traditional technical means, releasing the electrode plate from a height of several centimeters allows the electrode plate to fall freely, and there is a certain probability of damaging the electrode plate when performing actual stacking and handling operations, and the yield of the electrode plate is even lower than that of the solar cell plate.

[0052] In view of the problem of damage to the electrode plate during release, a common solution is to reduce the release height, and use a more accurate servo system to release the electrode plate from a height close to or even abutting the bottom bearing surface. However, this solution requires the use of a more expensive servo system, which is relatively high in cost.

[0053] Through our research, we found that there are mainly two reasons for the damage of the electrode plate:

[0054] 1. Related to the shape of the electrode plate itself: the surface of the wafer and the electrode plate is flat, and the process of falling in a horizontal posture is a process of gradually reducing the gap between the bottom surface of the plate and the bearing surface below (the upper surface of the plate below or the table surface of the station). The air in the gap between the plate and the bearing surface will be discharged from all around. As the gap gradually decreases, the discharge process of the air around will become more difficult, and thus a protective high-pressure air cushion is formed between the released plate and the bearing surface, thereby slowing down the falling speed of the plate.

[0055] 1.1 The surface of the electrode plate is provided with flow channels, which will make the air discharge process between the electrode plate and the bearing surface more smooth, and weaken the high-pressure air cushion in the middle.

[0056] 1.2 Many vias (for fixing the electrode plate, installing the electrode frame, pipeline passing, etc.) are arranged on the electrode plate. During the falling process of the electrode plate, the air between the electrode plate and the bearing surface will be discharged from the vias, further weakening the high-pressure air cushion in the middle.

[0057] Therefore, from the same height, the falling speed of the electrode plate is much greater than that of the flat plate. Even if the falling speed of the electrode plate is fast, a few centimeters of height will not damage the overall structure of the electrode plate. Through the statistics of the damaged electrode plates, it is found that the damage mainly occurs at the flow channel position of the electrode plate, which leads to the second reason.

[0058] 2. Low strength of the flow channel wall of the electrode plate: although the mechanical strength of the electrode plate itself is higher than that of the wafer, it has many small flow channels, and the flow channel wall is thin and easy to be damaged in collision.

[0059] The application of the above technical scheme of the present application has the following beneficial effects:

[0060] In view of the above research findings, the suction tooling of the electrode plate with flow channels proposed by the present application blows air downward from the vias of the electrode plate through the aligned compensation nozzles during the release process of the electrode plate, on the one hand, so as not to let the air flow escape from the vias, and on the other hand, to supplement the air below the electrode plate from the vias, thereby artificially creating a high-pressure area below the electrode plate.

[0061] The gas pressure under the electrode plate is raised, and the pressure difference between the upper and lower parts will lift the electrode plate, slowing down the falling speed of the electrode plate, thereby protecting the electrode plate. BRIEF DESCRIPTION OF DRAWINGS

[0062] Figure 1 is a schematic diagram of the adsorption tool of the present application under the adsorption station;

[0063] Figure 2 is a schematic diagram of the adsorption tool of the present application in the process from the adsorption station to the release station;

[0064] Figure 3 is a schematic diagram of the adsorption tool of the present application at the release station;

[0065] Figure 4 is Figure 1 a schematic diagram of the left half;

[0066] Figure 5 is Figure 4 an enlarged view of the middle A, and is also a schematic diagram of the working method of the adsorption tool of the present application at steps a, b and c;

[0067] Figure 6 is Figure 2 an enlarged view of the middle B, and is also a schematic diagram of the working method of the adsorption tool of the present application at step d-2;

[0068] Figure 7 is Figure 3 an enlarged view of the middle C, and is also a schematic diagram of the working method of the adsorption tool of the present application at step d-3;

[0069] Figure 8 is Figure 4 an enlarged view of the middle D;

[0070] Figure 9 is a simulation effect diagram of the adsorption station;

[0071] Figure 10 is a simulation effect diagram of the release station.

[0072] The blue arrows in the drawings are the gas flow directions.

[0073] REFERENCE SIGNS

[0074] 1 - chuck holder;

[0075] 2 - chuck, 2a - working surface;

[0076] 3 - compensation nozzle;

[0077] 4 - electrode plate;

[0078] 5 - negative pressure adsorption port;

[0079] 6 - air flow switcher, 6a - valve body, 6b - valve core, 6c - driver, 6d - air inlet, 6e - first air outlet, 6f - second air outlet, 6g - air flow channel;

[0080] 7 - vacuum generator, 7a - main flow channel, 7b - flow channel contraction, 7c - negative pressure flow channel, 7d - pressure cavity;

[0081] 8 - positive pressure ventilation pipe;

[0082] 9 - negative pressure maintaining valve;

[0083] 10 - enclosure. DETAILED DESCRIPTION

[0084] The specific embodiments of the present application are described in detail below. It should be appreciated that the detailed description of the specific embodiments is merely intended for explaining and illustrating the present application, and is not intended to limit the present application.

[0085] In the present application, the orientation words such as "upper" and "lower" generally refer to the orientation in the assembled and used state, unless otherwise specified. "Inner" and "outer" refer to the inner and outer relative to the outline of the components themselves.

[0086] It should be noted that the terms "first", "second", and the like in the description and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0087] In the present application, an adsorption tool with a flow channel electrode plate 4 is provided, including a suction cup holder 1 and a suction cup 2. The suction cup holder 1 is connected to a servo system. The suction cup 2 is mounted on the suction cup holder 1. The bottom of the suction cup 2 is provided with a flat working surface 2a. The working surface 2a is provided with a plurality of negative pressure suction ports 5 for adsorbing the electrode plate 4. At least one compensation nozzle 3 is arranged on the working surface 2a, and the compensation nozzle is aligned with the via hole of the electrode plate 4.

[0088] The suction cup holder 1 is a structural frame body, which serves as the mounting base for other components. The suction cup holder 1 is connected to the servo system that drives the movement of the adsorption tool, and the servo system is not part of the adsorption tool.

[0089] The suction cup 2 is mounted on the suction cup holder 1. The working surface 2a of the suction cup 2 is provided with a negative pressure suction port 5 capable of adsorbing the electrode plate 4. The negative pressure suction port 5 is connected with a negative pressure gas source, which can be directly connected with a vacuum pump or directly connected with a vacuum generator 7 provided by the application. The vacuum generator 7 will be described in detail later.

[0090] The compensation nozzle 3 is connected with a positive pressure gas source and is controlled by a valve to turn on and off. The compensation nozzle 3 is a gas nozzle that can spray gas outward, and the gas flow direction points to the via hole of the electrode plate 4. The compensation nozzle 3 can be provided with one or more. The compensation nozzle 3 is aligned with the via hole of the electrode plate 4. Preferably, the compensation nozzle 3 corresponds to the electrode plate 4 one by one. If the via hole on the electrode plate 4 is more, the compensation nozzle 3 is aligned with the larger via hole on the electrode plate 4. The smaller via hole can not be provided with the compensation nozzle 3. Preferably, 3-6 compensation nozzles 3 are provided, and the compensation nozzles 3 are arranged as much as possible around the electrode plate 4. The compensation nozzle 3 is aligned with the largest 3-6 via holes of the electrode plate 4.

[0091] The effect of the application can be seen from the simulation effect Figure 10 The simulation is a certain simplification and only a qualitative analysis. The specific quantitative analysis is determined according to the actual size, weight and many other factors of the electrode plate 4. Figure 10 In the figure, the dark blue part represents the environmental pressure, which is usually 1 atmosphere. The redder the color, the higher the pressure. The highest pressure appears at the nozzle of the compensation nozzle 3. The via hole of the electrode plate 4 stacked below also forms a high pressure area. Figure 10 In the figure, the uppermost electrode plate 4 is the electrode plate 4 in the process of falling. It can be clearly seen that the pressure between the falling electrode plate 4 and the bearing surface (the upper surface of the stacked electrode plate 4) is higher than the pressure above the electrode plate 4. The upper and lower surfaces of the falling electrode plate 4 form an effective pressure difference, which can slow down the falling speed of the electrode plate 4.

[0092] As shown in Figure 1 The suction tool further includes an air flow switcher 6 and a vacuum generator 7. The suction tool has a suction station and a release station. The suction station is the working state of the suction tool when it normally adsorbs the electrode plate 4. The release station is the state of the suction tool when it no longer adsorbs the electrode plate 4.

[0093] The air flow switcher 6 can switch between the suction station and the release station. The air flow switcher 6 is connected with the positive pressure gas source. The suction tool can switch between the suction station and the release station, which is realized by the air flow switcher 6. The vacuum generator 7 can use the incoming air flow as power to generate negative pressure lower than the environmental pressure.

[0094] By using the cooperation of the air flow switcher 6 and the vacuum generator 7, only the positive pressure gas source needs to be connected, and no additional negative pressure gas source is needed. For details, seeFigures 1-3 wherein, Figure 1 is an adsorption station, Figure 3 is a release station, Figure 2 is a switching process of the two stations.

[0095] Adsorption station: the gas flow from the positive pressure source is guided to the vacuum generator 7 through the gas flow switcher 6, the vacuum generator 7 generates negative pressure and communicates with the negative pressure adsorption port 5 through the gas flow channel 6g.

[0096] Release station: the gas flow from the positive pressure source is guided to the compensation nozzle 3 through the gas flow switcher 6 and sprayed from the compensation nozzle 3.

[0097] Gas flow switcher 6:

[0098] As shown in Figure 4 and Figure 5 , the gas flow switcher 6 includes an air inlet channel 6d, a first air outlet 6e, a second air outlet 6f, a valve core 6b and a driver 6c.

[0099] The air inlet channel 6d communicates with the positive pressure source. The air inlet channel 6d has an air inlet and an air outlet, the air inlet is connected to the positive pressure source through a pipeline, and the air outlet is aligned with the valve core 6b.

[0100] The first air outlet 6e is connected to the vacuum generator 7, and the second air outlet 6f is connected to the compensation nozzle 3. The connection mode can be determined according to the actual situation, as long as the gas and gas pressure of the first air outlet 6e are guided to the vacuum generator 7, and the gas and gas pressure of the second air outlet 6f are guided to the nozzle.

[0101] The driver 6c drives the valve core 6b to move to the adsorption station or the release station. When the valve core 6b is in the adsorption station, the air inlet channel 6d is in communication with the first air outlet 6e and the second air outlet 6f is closed, and when the valve core 6b moves to the release station, the air inlet channel 6d is in communication with the second air outlet 6f and the first air outlet 6e is closed. The driver 6c can adopt a linear servo driver 6c, an electric push rod, which is directly connected to the valve core 6b and directly drives the valve core 6b to move up and down.

[0102] As shown in Figure 4 , the driver 6c is fixed on the suction cup frame 1, and the driving rod of the driver 6c is connected to the suction cup 2 and drives the suction cup 2 to move.

[0103] The air inlet 6d is arranged on the chuck holder 1, the valve body 6a of the air flow switch 6 is arranged on the chuck 2, the valve core 6b is arranged on the valve body 6a, and the valve core 6b can slide up and down within a limited distance on the valve body 6a. The valve core 6b can be provided with a limiting structure upward and downward, the first limiting block clamps the valve core 6b after the valve core 6b moves to the upper dead point relative to the valve body 6a, so as to avoid the valve core 6b from continuously moving upward. Similarly, the second limiting block clamps the valve core 6b after the valve core 6b moves to the lower dead point relative to the valve body 6a, so as to avoid the valve core 6b from continuously moving downward.

[0104] The first air outlet 6e: the top of the valve core 6b is aligned with the gas outlet of the air inlet 6d. The top of the valve core 6b is provided with a plugging head made of flexible material. When the valve core 6b is located at the lower dead point of the valve body 6a (the adsorption station), the top of the valve core 6b is separated from the gas outlet of the air inlet 6d, and the gap between the valve core 6b and the air inlet 6d forms the first air outlet 6e. When the valve core 6b is located at the upper dead point of the valve body 6a (the release station), the plugging head at the top of the valve core 6b tightly presses the gas outlet at the bottom of the air inlet 6d, and the first air outlet 6e is closed.

[0105] The second air outlet 6f: the valve core 6b is provided with an air flow channel 6g. One end of the air flow channel 6g is aligned with the gas outlet of the air inlet 6d, and the other end is an air flow outlet. The gas outlet is communicated with the compensation nozzle 3. The air flow channel 6g on the valve core 6b and the air flow outlet are the second air outlet 6f. At the same time, the valve body 6a is provided with a plugging structure. When the valve core 6b is located at the upper dead point of the valve body 6a (the adsorption station), the plugging structure abuts against the air flow outlet of the valve core 6b, so as to close the second air outlet 6f. When the valve core 6b is located at the lower dead point of the valve body 6a (the release station), the plugging structure is deviated from the air flow outlet, and the gas in the air flow channel 6g of the valve core 6b flows to the compensation nozzle 3 through the air flow outlet.

[0106] In the application, the driver 6c does not directly drive the valve core 6b, but indirectly drives the valve body 6a to move up and down by driving the chuck 2. Therefore, a spring is arranged between the valve core 6b and the valve body 6a, and the valve core 6b is upwardly supported by the spring. When the top of the valve core 6b is not forced, the spring keeps the valve core 6b at the upper dead point of the valve body 6a, so as to avoid the valve core 6b from sliding downward to open the air flow outlet of the valve core 6b.

[0107] The plugging structure: the air flow outlet end of the air flow channel 6g of the valve core 6b is provided with a plugging piece. The overhole is formed on the circumferential surface at the bottom of the air flow channel 6g to form the air flow outlet. The plugging structure includes a plugging ring arranged on the valve body 6a. The plugging ring surrounds the valve core 6b.

[0108] When the valve core 6b moves to the adsorption station, the plugging ring is aligned with and plugs the air flow outlet of the valve core 6b; when the valve core 6b moves to the release station, the plugging ring is deviated from the air flow outlet, and the gas is sprayed from the air flow outlet and then flows to the compensation nozzle 3.

[0109] As shown in the simulation result diagram of Figure 10 The compensation nozzle 3 extends out of the working surface 2a. The compensation nozzle 3 is inserted into the via of the electrode plate 4. On the one hand, the compensation nozzle 3 can position the electrode plate 4, and on the other hand, it can enhance the effect of pressure compensation on the lower surface of the electrode plate 4. The distance of the compensation nozzle 3 extending out of the working surface 2a is not greater than the thickness of the electrode plate 4.

[0110] The positive pressure vent pipe 8: the electrode plate 4 is close to the working surface 2a of the suction cup 2, and due to the van der Waals force or electrostatic adsorption, etc., the electrode plate 4 will have a certain adsorption adhesion on the suction cup 2, which will cause the electrode plate 4 not to fall after the negative pressure of the negative pressure adsorption port 5 disappears. Therefore, the adsorption tool further comprises a positive pressure vent pipe 8, one end of the positive pressure vent pipe 8 is communicated with the negative pressure adsorption port 5, and the other end is aligned with the gas flow outlet of the gas flow channel 6g of the release position valve core 6b. In the release position, gas is sprayed from the gas flow outlet of the valve core 6b, and part of the gas flow is guided into the negative pressure adsorption port 5 through the positive pressure vent pipe 8, so that the negative pressure adsorption port 5 is in a positive pressure state, and in turn overcomes the adhesion adsorption of the electrode plate 4 on the working surface 2a of the suction cup 2, and pushes the electrode plate 4 away from the working surface 2a. Referring to Figure 10 In the present application, the positive pressure vent pipe 8 is directly connected with the pressure chamber 7d, and it can be seen that the pressure in the pressure chamber 7d is higher than 1 atmosphere.

[0111] Vacuum generator 7:

[0112] As shown in Figure 8 The vacuum generator 7 comprises a main flow channel 7a and a negative pressure flow channel 7c. The inlet section of the main flow channel 7a is connected with the gas outlet of the adsorption position of the gas flow switch 6, and the main flow channel 7a has a flow channel contraction part 7b, the side wall of the flow channel contraction part 7b is provided with a side hole, one end of the negative pressure flow channel 7c is connected with the side hole, and the other end is communicated with the negative pressure adsorption port 5.

[0113] In the present application, the main flow channel 7a is formed between the lower surface of the suction cup holder 1 and the upper surface of the suction cup 2. The left and right sides of the main flow channel 7a can be constrained by using elastic materials such as organza tape. The suction cup 2 has a pressure chamber 7d, one end of the negative pressure flow channel 7c away from the main flow channel 7a is connected with the pressure chamber 7d, and the negative pressure adsorption port 5 is communicated with the pressure chamber 7d.

[0114] Figure 9 The red part in the middle represents the environmental pressure (1 atmosphere), and the bluer the color, the smaller the pressure. When the gas passes through the flow channel contraction part 7b, the pressure is obviously reduced, and the pressure in the pressure chamber 7d leaks from the negative pressure flow channel 7c, so that the whole pressure chamber 7d maintains a negative pressure state. The pressure chamber 7d is directly communicated with the negative pressure adsorption port 5, and the negative pressure adsorption port 5 is maintained in an adsorbed state.

[0115] The formation of the flow channel contraction part 7b is as followsFigure 3 As shown in the drawings, the flow channel contraction 7b is formed by setting a flexible rubber block on the top of the main flow channel 7a (the lower surface of the chuck frame 1) or the bottom of the main flow channel 7a (the upper surface of the chuck 2). The side hole is directly opened on the rubber block or aligned with the rubber block. When the release station, the side hole will be stopped on the flow channel contraction 7b, so as to block the side hole, avoid the positive pressure of the positive pressure vent pipe 8 from escaping from the side buckle through the negative pressure vent pipe.

[0116] As shown in the drawings, the work surface 2a is provided with a plurality of negative pressure suction ports 5, and a plurality of negative pressure suction ports 5 are connected to the same pressure chamber 7d. The negative pressure suction port 5 is provided with a negative pressure maintaining valve 9. As shown in the drawings, Figure 8 As shown in the drawings, the negative pressure maintaining valve 9 includes a stepped hole, a valve cover and an elastic member. The upper hole section of the stepped hole has a small hole diameter, and the lower hole section has a large hole diameter. The valve cover has a diameter larger than the upper hole section and smaller than the lower hole section. The valve cover is installed in the lower hole section by the elastic member, and the valve cover and the side wall of the lower hole section are provided with a gap. The external airflow flows into the pressure chamber 7d through the negative pressure maintaining valve, and the valve cover tightly seals the stepped hole by overcoming the elastic force of the elastic member.

[0117] As shown in the drawings, Figure 1 And Figure 10 As shown in the drawings, the adsorption tool further includes a fence 10 installed on the chuck frame 1. The fence 10 is annular and surrounds the electrode plate 4, and the fence 10 and the edge of the electrode plate 4 are provided with a gap. The fence 10 is located in the outer periphery of the falling electrode plate 4 and the bearing surface (the upper surface of the electrode plate 4 has been stacked and stored below), which can further slow down the gas escaping from the electrode plate 4 and the bearing surface, and improve the pressure between the electrode plate 4 and the bearing surface.

[0118] Preferably, in order to avoid the interference of the fence 10 when grabbing the electrode plate 4, the fence 10 is installed on the chuck frame 1 by a lifting driving assembly, and the lifting driving assembly drives the fence 10 to move up and down.

[0119] The application also provides a working method of the adsorption tool described above, which includes the following steps:

[0120] a. The servo system drives the adsorption tool to move above the electrode plate 4 to be adsorbed;

[0121] b. The negative pressure suction port 5 maintains the negative pressure adsorption state, and the servo system drives the adsorption tool to move downward, and the bottom work surface 2a of the chuck 2 contacts the electrode plate 4 to be adsorbed;

[0122] c. The negative pressure suction port 5 maintains the negative pressure adsorption state, and the adsorption tool carries the adsorbed electrode plate 4 to move above the release station, and the adsorbed electrode plate 4 has a gap between the stacked and stored electrode plate 4 below;

[0123] d. The negative pressure suction port 5 is released from the negative pressure to release the adsorbed electrode plate 4, and at the same time the compensation nozzle 3 is opened, and the compensation nozzle 3;

[0124] The adsorbed electrode plate 4 falls under the action of gravity, and the gas sprayed by the compensation nozzle 3 enters the gap between the falling electrode plate 4 and the lower stacked electrode plate 4 to form a high pressure area to slow down the falling speed of the electrode plate 4;

[0125] e. After the falling electrode plate 4 falls on the stack of stacked electrode plates 4 in step d, the compensation nozzle 3 is closed, and the process returns to step a.

[0126] Specifically, step d from the adsorption station to the release station includes the following specific steps:

[0127] d-1. As shown in Figure 5 , the valve core 6b is moved to the upper stop point of the valve body 6a under the action of the spring support, and the gap between the top of the valve core 6b and the gas outlet at the bottom of the air inlet 6d forms the first gas outlet 6e; the gas flows to the vacuum generator 7 through the first gas outlet 6e, generates negative pressure, and communicates with the negative pressure suction port 5 through the airflow channel 6g;

[0128] The sealing ring aligns and blocks the airflow outlet of the valve core 6b, and the compensation nozzle 3 is in a non-working state;

[0129] d-2. As shown in Figure 6 , the driver 6c drives the suction cup 2 to move upward, and the suction cup 2 synchronously moves upward with the valve body 6a and the valve core 6b, and the top of the valve core 6b abuts against the gas outlet at the bottom of the air inlet 6d;

[0130] At this time, the gap between the valve core 6b and the gas outlet of the air inlet 6d disappears, the first gas outlet 6e is closed, the vacuum generator 7 stops working, and the negative pressure suction port 5 is released from the negative pressure;

[0131] At this time, the valve core 6b is still located at the upper stop point of the valve body 6a.

[0132] d-3. As shown in Figure 7 , the top of the valve core 6b abuts against the bottom of the air inlet 6d and no longer moves upward, the driver 6c drives the suction cup 2 and the valve body 6a to continue moving upward, the valve core 6b slides downward relative to the valve body 6a, and the sealing ring is misaligned with the airflow outlet of the valve core 6b;

[0133] A part of the gas sprayed from the airflow outlet of the valve core 6b flows into the positive pressure ventilation pipe 8, and the negative pressure suction port 5 appears positive pressure, so as to push and squeeze the adsorbed electrode plate 4 downward to separate from the working surface 2a of the suction cup 2, and the adsorbed electrode plate 4 falls under the action of gravity;

[0134] The other part of the gas jetted out from the gas flow outlet of the valve core 6b flows to the compensation nozzle 3 again, the compensation nozzle 3 starts to jet gas, and the gas jetted out from the compensation nozzle 3 enters the gap between the falling electrode plate 4 and the electrode plate 4 stacked below to form a high-pressure area to slow down the falling speed of the electrode plate 4.

[0135] The above description is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made by using the content of the specification and drawings of the present application, is also included in the patent protection scope of the present application.

Claims

1. An adsorption fixture with a flow channel electrode plate, characterized in that, include: A suction cup frame (1) is connected to a servo system, and a suction cup (2) is installed on the suction cup frame (1). The bottom of the suction cup (2) is provided with a flat working surface (2a), and the working surface (2a) has several negative pressure suction ports (5) for adsorbing the electrode plate (4). At least one compensation nozzle (3) is provided on the working surface (2a), and the compensation nozzle is aligned with the through hole of the electrode plate (4); The adsorption fixture also includes an airflow switch (6) and a vacuum generator (7); the adsorption fixture has an adsorption station and a release station; The airflow switch (6) can switch between the adsorption station and the release station; the airflow switch (6) is connected to a positive pressure air source; Adsorption station: The airflow from the positive pressure gas source is guided to the vacuum generator (7) through the airflow switch (6). The vacuum generator (7) generates negative pressure and is connected to the negative pressure adsorption port (5) through the airflow channel (6g). Release station: The airflow from the positive pressure air source is guided to the compensation nozzle (3) via the airflow switch (6) and sprayed out from the compensation nozzle (3); The airflow switch (6) includes an air inlet (6d), a first air outlet (6e), a second air outlet (6f), a valve core (6b), and a driver (6c). The air inlet (6d) is connected to a positive pressure air source, the first air outlet (6e) is connected to a vacuum generator (7), and the second air outlet (6f) is connected to a compensating nozzle (3). The actuator (6c) drives the valve core (6b) to move to the adsorption station or the release station. When the valve core (6b) is located in the adsorption station, the air inlet (6d) is connected to the first air outlet (6e) and the second air outlet (6f) is closed. When the valve core (6b) moves to the release station, the air inlet (6d) is connected to the second air outlet (6f) and the first air outlet (6e) is closed.

2. The adsorption fixture with flow channel electrode plate according to claim 1, characterized in that: An air intake (6d) is mounted on a suction cup holder (1), a valve body (6a) of an airflow switch (6) is mounted on a suction cup (2), a valve core (6b) is mounted on the valve body (6a), the valve core (6b) can slide up and down within a limited distance on the valve body (6a), and the top of the valve core (6b) is aligned with the gas outlet of the air intake (6d); a spring is provided between the valve core (6b) and the valve body (6a) to push the valve core (6b) upward. The valve core (6b) has an airflow channel (6g), one end of which is aligned with the gas outlet of the air inlet (6d), and the other end is the airflow outlet, which is connected to the compensation nozzle (3). A sealing structure is provided on the valve body (6a); The driver (6c) is fixed on the suction cup holder (1), and the drive rod of the driver (6c) is connected to the suction cup (2) and drives the suction cup (2) to move.

3. The adsorption fixture with flow channel electrode plate according to claim 2, characterized in that, A sealing piece is provided at the air outlet end of the airflow channel (6g) of the valve core (6b), and a through hole is opened on the circumferential surface at the bottom of the airflow channel (6g) to form an airflow outlet; The sealing structure includes a sealing ring disposed on the valve body (6a), the sealing ring being disposed around the valve core (6b); When the valve core (6b) moves to the adsorption station, the sealing ring aligns with and blocks the airflow outlet of the valve core (6b). When the valve core (6b) moves to the release station, the sealing ring is misaligned with the airflow outlet, and the gas is ejected from the airflow outlet and flows to the compensation nozzle (3). The compensating nozzle (3) extends downward out of the working surface (2a) and is inserted into the through hole of the electrode plate (4).

4. The adsorption fixture with flow channel electrode plate according to claim 3, characterized in that, The adsorption fixture also includes a positive pressure vent pipe (8), one end of which is connected to the negative pressure adsorption port (5), and the other end is aligned with the airflow outlet of the airflow channel (6g) of the valve core (6b) at the release station.

5. The adsorption fixture with flow channel electrode plate according to claim 1, characterized in that, The vacuum generator (7) includes a main channel (7a) and a negative pressure channel (7c). The inlet section of the main channel (7a) is connected to the outlet of the adsorption station of the airflow switch (6). The main channel (7a) has a channel contraction section (7b). A side hole is opened on the side wall of the channel contraction section (7b). One end of the negative pressure channel (7c) is connected to the side hole, and the other end is connected to the negative pressure adsorption port (5). The suction cup (2) has a pressure chamber (7d), and the end of the negative pressure flow channel (7c) away from the main flow channel (7a) is connected to the pressure chamber (7d). The negative pressure adsorption port (5) is connected to the pressure chamber (7d).

6. The adsorption fixture with flow channel electrode plate according to claim 5, characterized in that, Multiple negative pressure adsorption ports (5) are provided on the working surface (2a), and several negative pressure adsorption ports (5) are connected to the same pressure chamber (7d). A negative pressure maintaining valve (9) is installed in the negative pressure adsorption port (5). The negative pressure maintaining valve (9) includes a stepped hole, a valve cover and an elastic element. The upper section of the stepped hole has a small diameter and the lower section has a large diameter. The valve cover has a diameter larger than the upper section and smaller than the lower section. The valve cover is installed into the lower section through the elastic element, and a gap is reserved between the valve cover and the side wall of the lower section. External airflow flows into the pressure chamber (7d) through the negative pressure maintaining valve (9), and the valve cover overcomes the elastic force of the elastic element and tightly adheres to the shoulder of the stepped hole to seal the stepped hole.

7. The adsorption fixture with flow channel electrode plate according to claim 1, characterized in that, The adsorption fixture also includes a barrier (10) installed on the suction cup frame (1). The barrier (10) is ring-shaped and surrounds the electrode plate (4). A gap is reserved between the barrier (10) and the edge of the electrode plate (4). The enclosure (10) is installed on the suction cup frame (1) by a lifting drive assembly, and the lifting drive assembly drives the enclosure (10) to move up and down.

8. A method for using the adsorption fixture according to any one of claims 1-7, characterized in that, Includes the following steps: a. The servo system drives the adsorption fixture to move directly above the electrode plate (4) to be adsorbed; b. The negative pressure adsorption port (5) maintains a negative pressure adsorption state, while the servo system drives the adsorption fixture to descend to the bottom working surface (2a) of the suction cup (2) and contact the electrode plate (4) to be adsorbed. c. The negative pressure adsorption port (5) maintains a negative pressure adsorption state. The adsorption fixture carries the adsorbed electrode plate (4) to the top of the release station. There is a gap between the adsorbed electrode plate (4) and the stacked electrode plates (4) below. d. Remove the negative pressure at the negative pressure adsorption port (5), release the adsorbed electrode plate (4), and simultaneously open the compensation nozzle (3). The adsorbed electrode plate (4) falls due to gravity. The gas ejected by the compensating nozzle (3) enters the gap between the falling electrode plate (4) and the stacked electrode plate (4) below to form a high-pressure zone, which slows down the falling speed of the electrode plate (4). e. After the falling electrode plate (4) in step d lands on the stacked electrode plates (4), the compensation nozzle (3) is turned off, and then the process returns to step a.

9. A method for using the adsorption fixture according to claim 4, characterized in that, Includes the following steps: a. The servo system drives the adsorption fixture to move directly above the electrode plate (4) to be adsorbed; b. The negative pressure adsorption port (5) maintains a negative pressure adsorption state, while the servo system drives the adsorption fixture to descend to the bottom working surface (2a) of the suction cup (2) and contact the electrode plate (4) to be adsorbed. c. The negative pressure adsorption port (5) maintains a negative pressure adsorption state. The adsorption fixture carries the adsorbed electrode plate (4) to the top of the release station. There is a gap between the adsorbed electrode plate (4) and the stacked electrode plates (4) below. d. Remove the negative pressure at the negative pressure adsorption port (5), release the adsorbed electrode plate (4), and simultaneously open the compensation nozzle (3). The adsorbed electrode plate (4) falls due to gravity. The gas ejected by the compensating nozzle (3) enters the gap between the falling electrode plate (4) and the stacked electrode plate (4) below to form a high-pressure zone, which slows down the falling speed of the electrode plate (4). e. After the falling electrode plate (4) in step d lands on the stacked electrode plates (4), the compensation nozzle (3) is turned off, and then the process returns to step a. Step d, from the adsorption station to the release station, includes the following specific steps: d-1. During the adsorption stage, the valve core (6b) moves to the upper stop of the valve body (6a) under the support of the spring. There is a gap between the top of the valve core (6b) and the air outlet at the bottom of the air inlet (6d), which forms the first air outlet (6e). The gas flows to the vacuum generator (7) through the first air outlet (6e), generates negative pressure, and connects with the negative pressure adsorption port (5) through the airflow channel (6g). The sealing ring is aligned with and blocks the airflow outlet of the valve core (6b), and the compensating nozzle (3) is in a non-working state; d-2, The driver (6c) drives the suction cup (2) to move upward. The suction cup (2) moves upward synchronously with the valve body (6a) and the valve core (6b). The top of the valve core (6b) is attached to the air outlet at the bottom of the air inlet (6d). At this time, the gap between the valve core (6b) and the air outlet of the air inlet (6d) disappears, the first air outlet (6e) closes, the vacuum generator (7) stops working, and the negative pressure of the negative pressure adsorption port (5) is removed. d-3, the top of the valve core (6b) presses against the bottom of the air intake (6d) and no longer moves upward. The actuator (6c) drives the suction cup (2) and the valve body (6a) to continue moving upward. The valve core (6b) slides downward relative to the valve body (6a), and the sealing ring is misaligned with the airflow outlet of the valve core (6b). A portion of the gas ejected from the air outlet of the valve core (6b) is injected into the positive pressure ventilation pipe (8), and a positive pressure is generated in the negative pressure adsorption port (5), thereby pushing the adsorbed electrode plate (4) downward away from the working surface (2a) of the suction cup (2) and falling under gravity; Another part of the gas ejected from the air outlet of the valve core (6b) flows to the compensation nozzle (3), the compensation nozzle (3) starts to spray gas, and the gas ejected from the compensation nozzle (3) enters the gap between the falling electrode plate (4) and the stacked electrode plate (4) below to form a high-pressure zone to slow down the falling speed of the electrode plate (4).

Images