A method and system for potting a bolt-type aluminum electrolytic capacitor

Abstract

The application discloses a glue filling method and system of a bolt type aluminum electrolytic capacitor, and is used for improving the structural stability of the capacitor. The application comprises the following steps: obtaining size information of an aluminum shell and a target pre-gluing distribution, determining a circumferential relative motion parameter and a glue output parameter according to the size information and the target pre-gluing distribution; extending a glue spraying head into the aluminum shell, and making the glue output position of the glue spraying head and the inner circumferential wall of the aluminum shell produce circumferential relative motion, outputting pre-gluing material to the inner circumferential wall according to the circumferential relative motion parameter and the glue output parameter, and obtaining a pre-gluing area conforming to the target pre-gluing distribution; obtaining a glue material state parameter of the pre-gluing area, determining an allowed glue filling time period corresponding to the pre-gluing area according to the glue material state parameter; loading a core into the aluminum shell, and filling glue filling material between the core and the aluminum shell in the allowed glue filling time period, so that the glue filling material is in contact with the pre-gluing area; and curing the pre-gluing material and the glue filling material, and forming a fixed glue body connecting the inner wall of the aluminum shell and the core.

Description

Technical Field

[0001] This application relates to the field of capacitor manufacturing technology, and in particular to a potting method and system for a bolt-type aluminum electrolytic capacitor. Background Technology

[0002] Bolted aluminum electrolytic capacitors typically consist of an aluminum case and a core housed within the case. Because the core is relatively large and heavy, it is susceptible to mechanical vibration. Therefore, during the assembly process, adhesive is usually injected into the aluminum case. After the adhesive cures, it connects the core to the case, providing support and stability for the core.

[0003] Current potting processes typically involve first inserting the core into an aluminum shell, then pouring adhesive into the space between the core and the shell through an opening in the shell. The injected adhesive flows downwards along the potting space between the outer circumference of the core and the inner wall of the aluminum shell, gradually filling the bottom of the core and the area around it.

[0004] The potting compound needs to flow through a specific path to reach the target location on the inner wall of the aluminum shell. During this process, insufficient flowability of the compound and inadequate wetting of certain areas on the inner wall of the aluminum shell prevent the compound from fully adhering to the shell. Furthermore, the volume shrinkage of the compound during curing can easily cause localized detachment of the cured compound from the inner wall, creating gaps between the compound and the shell. These gaps reduce the effective bonding area, decreasing the support and constraint effect of the compound on the core. When bolt-type aluminum electrolytic capacitors are subjected to vibration or impact, the core is prone to wobbling relative to the aluminum shell, thus affecting the structural stability and reliability of the capacitor. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a potting method and system for bolt-type aluminum electrolytic capacitors, which can improve the structural stability of the capacitors.

[0006] The technical solution provided in this application is described below: The first aspect of this application provides a potting method for bolt-type aluminum electrolytic capacitors, including: Obtain the size information of the aluminum shell and the target pre-coated adhesive distribution, and determine the circumferential relative motion parameters and adhesive dispensing parameters based on the size information and the target pre-coated adhesive distribution; The glue nozzle is inserted into the aluminum shell, and the glue outlet position of the glue nozzle is made to move circumferentially relative to the inner peripheral wall of the aluminum shell. The pre-coated glue is output to the inner peripheral wall according to the circumferential relative movement parameters and the glue outlet parameters to obtain a pre-coated glue area that conforms to the target pre-coated glue distribution. Obtain the adhesive state parameters of the pre-coated area, and determine the allowable dispensing time period corresponding to the pre-coated area based on the adhesive state parameters; The core is inserted into the aluminum shell, and during the permitted potting period, potting compound is poured between the core and the aluminum shell, so that the potting compound comes into contact with the pre-coated area; The pre-coated adhesive and the potting adhesive are cured to form a fixed adhesive that connects the inner wall of the aluminum shell to the core.

[0007] Optionally, the step of causing the glue dispensing position of the glue spray head to move circumferentially relative to the inner peripheral wall of the aluminum shell includes: Keeping the position of the spray nozzle relative to the pre-applied adhesive station unchanged, drive the aluminum shell to rotate around its own axis, so that the adhesive outlet position of the spray nozzle moves circumferentially relative to the inner peripheral wall of the aluminum shell. Alternatively, keeping the position of the aluminum shell unchanged, drive the glue dispensing position of the glue spraying head to move around the axis of the aluminum shell, so that the glue dispensing position of the glue spraying head moves circumferentially relative to the inner peripheral wall of the aluminum shell.

[0008] Optionally, the target pre-coated adhesive is distributed in a ring shape that extends continuously along the inner peripheral wall of the aluminum shell; The step of determining the circumferential relative motion parameters and adhesive dispensing parameters based on the size information and the target pre-coated adhesive distribution includes: Obtain the preset unit circumferential length of adhesive application and the calibrated adhesive flow rate of the spray nozzle, and determine the target circumferential angular velocity based on the inner diameter of the aluminum shell, the preset unit circumferential length of adhesive application, and the calibrated adhesive flow rate. The circumferential relative motion angle is set to 360°, and the glue dispensing mode of the glue spray head is set to continuous glue dispensing.

[0009] Optionally, the target pre-coated adhesive distribution includes a plurality of pre-coated adhesive sub-regions spaced apart along the inner peripheral wall of the aluminum shell; The step of determining the circumferential relative motion parameters and adhesive dispensing parameters based on the size information and the target pre-coated adhesive distribution includes: The preset circumferential interval length between two adjacent pre-coated glue areas, the target glue amount of each pre-coated glue area, and the calibrated glue flow rate of the spray nozzle are obtained. The target angular interval corresponding to the two adjacent pre-coated glue areas is determined according to the inner diameter of the aluminum shell and the preset circumferential interval length. The target circumferential position corresponding to each of the pre-coated glue areas is determined according to the target angle interval; The corresponding single dispensing time is determined based on the target amount of adhesive applied to each pre-coated sub-area and the calibrated dispensing flow rate. The circumferential relative motion mode is determined to move the glue dispensing position of the glue spray head sequentially to each of the target circumferential positions, and the glue dispensing mode of the glue spray head is determined to dispense glue intermittently at each of the target circumferential positions.

[0010] Optionally, before obtaining the adhesive state parameters of the pre-coated area, the dispensing method further includes: The actual glue distribution in the pre-coated area is detected, and the actual glue distribution is compared with the target pre-coated glue distribution to determine the glue-deficient area and the circumferential position corresponding to the glue-deficient area. Based on the circumferential position corresponding to the glue-deficient area, the glue dispensing position of the glue nozzle is aligned with the glue-deficient area. The glue replenishment parameters are determined based on the difference between the glue-deficient area and the target pre-coated glue distribution, and glue is replenished to the glue-deficient area according to the glue replenishment parameters.

[0011] Optionally, the adhesive state parameters include the elapsed time since the formation of the pre-coated area and the temperature of the pre-coated area; The step of determining the allowable dispensing time period corresponding to the pre-coated area based on the adhesive state parameters includes: The time period during which the elapsed time does not exceed the preset bonding time and the temperature of the pre-coated area is within the preset bonding temperature range is defined as the allowable glue application period.

[0012] Optionally, when the elapsed time exceeds the preset bonding time but does not exceed the preset activation time, and the temperature of the pre-coated area is lower than the lower limit of the preset bonding temperature range, the pre-coated area is heated. When the temperature recovers to the preset bonding temperature range, the preset secondary bonding time from the time of temperature recovery is determined as the updated allowable potting time period, and the core is installed into the aluminum shell and the potting adhesive is poured in during the updated allowable potting time period.

[0013] Optionally, the pre-coated adhesive and the potting adhesive are the same adhesive. The step of injecting potting compound between the core and the aluminum shell includes: The potting adhesive is poured in according to the first potting flow rate until the amount poured in reaches the preset contact amount. The preset contact amount is determined based on the space between the core and the aluminum shell and the position of the pre-coated area, so that the potting adhesive comes into contact with the pre-coated area. Continue injecting the glue at a second injection flow rate greater than the first injection flow rate until the preset injection volume is reached, so that the glue can bond with the pre-coated glue within the preset bonding temperature range.

[0014] Optionally, before inserting the adhesive nozzle into the aluminum housing, the adhesive application method further includes: Obtain the standby status information of the glue spray head, and determine whether the glue spray head meets the preset glue discharge conditions based on the standby status information; If the preset glue discharge conditions are met, the residual glue receiving mechanism is moved below the glue spray head, and the glue spray head is controlled to output pre-coated glue to the residual glue receiving mechanism; After the actual glue dispensing state of the glue spray head meets the preset stable glue dispensing conditions, the glue spray head is controlled to stop dispensing pre-coated glue, and the residual glue receiving mechanism is moved out from under the glue spray head.

[0015] A second aspect of this application provides a potting system for a bolt-type aluminum electrolytic capacitor, comprising: Conveying components, rotating components, pre-applied adhesive components, core-filling components, and potting components; The pre-coating assembly and the dispensing assembly are sequentially arranged corresponding to the conveying assembly along the aluminum shell conveying direction; The rotating component is correspondingly arranged with the pre-applied adhesive component. The rotating component is used to position the aluminum shell and drive the aluminum shell to rotate around its own axis. The pre-applied adhesive assembly includes a spray nozzle and a pre-applied adhesive supply mechanism connected to the spray nozzle. The spray nozzle can extend into an aluminum shell positioned by the rotating assembly and output pre-applied adhesive to a predetermined position on the inner wall of the aluminum shell during the rotation of the aluminum shell to form a pre-applied adhesive area. The core-loading assembly and the glue-filling assembly are respectively arranged. The core-loading assembly is used to load the core into the aluminum shell with the pre-coated area, and the glue-filling assembly is used to fill the space between the core and the aluminum shell with glue material so that the glue material contacts the pre-coated area.

[0016] As can be seen from the above technical solutions, this application has the following beneficial effects: 1. In this application, before inserting the core into the aluminum shell, a pre-applied adhesive is directly applied to predetermined positions on the bottom and sides of the aluminum shell. Since the core does not obstruct the spray nozzle and the flow path of the adhesive during pre-applied adhesive, the pre-applied adhesive can directly reach the inner wall of the aluminum shell and fully spread and adhere at the predetermined positions, thereby pre-forming a pre-applied adhesive layer that bonds with the inner wall of the aluminum shell.

[0017] 2. The potting compound comes into contact with the pre-coated adhesive layer when it is in a state where bonding is permissible, allowing the potting compound and the pre-coated adhesive to fuse together or form an adhesive interface. The fixed colloid formed by the solidification of the potting compound then connects to the inner wall of the aluminum shell through the pre-coated adhesive layer. When the fixed colloid shrinks in volume during solidification, the pre-coated adhesive layer can maintain the interfacial connection between the fixed colloid and the inner wall of the aluminum shell, reducing the possibility of the fixed colloid partially separating from the inner wall of the aluminum shell due to shrinkage, thereby reducing the gap between the fixed colloid and the inner wall of the aluminum shell, and improving the support and constraint stability of the fixed colloid for the core.

[0018] 3. Determine the glue-deficient areas based on the difference between the actual glue distribution and the target pre-coated glue distribution, and perform targeted glue replenishment in the glue-deficient areas to reduce local missed coating or insufficient glue application.

[0019] 4. Adopting a staged dispensing method of first low flow rate and then high flow rate can reduce the impact and disturbance on the pre-coated adhesive when the dispensing adhesive first comes into contact with the pre-coated adhesive area, and improve dispensing efficiency after the two come into contact. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic flowchart of one embodiment of the glue-pouring method of this application; Figure 2 A flowchart illustrating the method for determining parameters of continuous annular pre-coating. Figure 3 A flowchart illustrating the method for determining the pre-coating parameters for the interval; Figure 4 A flowchart illustrating the pre-coated area detection and re-coating method; Figure 5 This is a flowchart illustrating the staged glue-pouring method. Figure 6 A flowchart illustrating the pre-dispensing method for the glue spray head; Figure 7 This is a schematic diagram of the dispensing system of this application; Figure 8 This is a schematic diagram of the core assembly of this application; Figure 9 This is a schematic diagram of the potting assembly of this application; Figure 10 This is a schematic diagram of the pre-coated area of ​​this application; In the dispensing system, there are conveying components 01, rotating components 02, pre-applied adhesive components 03, core-filling components 04, dispensing components 05, aluminum shell 06, dispensing head 07, pre-applied adhesive area 08, and transfer components 09. Detailed Implementation

[0022] This application provides an embodiment of a potting method for bolt-type aluminum electrolytic capacitors. In this embodiment, the potting method can be applied to bolt-type aluminum electrolytic capacitors of different specifications or other potting scenarios that require fixing the core to a cylindrical shell with adhesive. The potting method uses the size information of the aluminum shell and the target pre-coated adhesive distribution to determine the circumferential relative motion parameters and dispensing parameters. Before the core is installed into the aluminum shell, the pre-coated adhesive is directly applied to a predetermined position on the inner wall of the aluminum shell. The allowable potting period is determined based on the state of the adhesive in the pre-coated area. Within the allowable potting period, the core is installed and the potting adhesive is poured in, allowing the potting adhesive to bond with the pre-coated area. This reduces the possibility of gaps between the fixed adhesive formed after the adhesive solidifies and the inner wall of the aluminum shell, improving the support and constraint stability of the fixed adhesive for the core.

[0023] In this application, the pre-coated adhesive refers to the adhesive applied directly to the inner wall of the aluminum shell before the core is inserted into the shell, while the potting adhesive refers to the adhesive injected between the core and the aluminum shell after the core is inserted into the shell. The pre-coated adhesive and the potting adhesive can be the same adhesive or different adhesives that can bond with each other.

[0024] In this application, the selection of the pre-coated adhesive and the potting adhesive should meet the requirement that they can form a stable bonding interface upon subsequent contact. When the pre-coated adhesive and the potting adhesive are the same, they are brought into contact while the pre-coated adhesive is still in a bondable state, so that the subsequently poured potting adhesive can fuse with the pre-coated adhesive or form a continuous colloid. When different adhesives are used, the compatibility or interfacial adhesion between the two adhesives should be determined in advance to avoid delamination between the pre-coated adhesive and the potting adhesive after curing. The specific type of pre-coated adhesive can be selected based on the aluminum shell material, core structure, operating temperature, and curing process.

[0025] Please see Figure 1 This application provides an embodiment of a potting method for a bolt-type aluminum electrolytic capacitor, the embodiment including: 101. Obtain the size information of the aluminum shell and the target pre-coated adhesive distribution, and determine the circumferential relative motion parameters and adhesive dispensing parameters based on the size information and the target pre-coated adhesive distribution.

[0026] The dimensions of the aluminum shell include its inner diameter, internal height, and the distance between the area to be coated and the bottom of the shell. These dimensions can be retrieved from a pre-established product parameter table based on the product model of the aluminum shell to be processed, or obtained through measurement using a measuring device. It is understood that when aluminum shells in the same batch have the same specifications, the dimensions can be obtained once before batch processing and used for multiple shells within the batch, eliminating the need to remeasure each shell after it enters the pre-coating area.

[0027] The target pre-coated adhesive distribution can include an axial height range or multiple circumferential distribution areas spaced apart along the axial direction. When multiple axial positions are included, after completing the pre-coating at one axial position, the adhesive nozzle moves along the aluminum shell axis to another axial position and performs circumferential pre-coating again.

[0028] The target pre-coated adhesive distribution refers to the expected location, extent, and distribution pattern of the pre-coated adhesive on the inner wall of the aluminum shell. The target pre-coated adhesive distribution can be pre-set according to the aluminum shell specifications, core installation location, and subsequent adhesive application requirements. For example, the target pre-coated adhesive distribution can be a continuous ring-shaped distribution extending along the inner circumferential wall of the aluminum shell near the bottom, or it can be multiple pre-coated adhesive sub-regions spaced apart along the inner circumferential wall of the aluminum shell. The target pre-coated adhesive distribution also includes the height of the pre-coated area relative to the bottom of the aluminum shell, the adhesive width along the axial direction of the aluminum shell, and the circumferential position of each pre-coated adhesive sub-region.

[0029] Circumferential relative motion parameters refer to the parameters used to control the glue dispensing position of the glue nozzle relative to the inner circumferential wall of the aluminum shell along the circumferential direction. These parameters include the direction, speed, angle, starting position, and ending position of the circumferential relative motion. Circumferential relative motion refers to the movement of the glue dispensing position of the glue nozzle relative to the inner circumferential wall of the aluminum shell along the circumferential direction.

[0030] Dispensing parameters refer to the parameters used to control the output of pre-coated adhesive from the dispensing head, including dispensing flow rate, single dispensing volume, dispensing duration, dispensing start position, dispensing stop position, and dispensing mode of continuous or intermittent dispensing.

[0031] In this embodiment, the circumferential position and coverage area to be coated can be determined based on the target pre-coated adhesive distribution. The circumferential length is converted into a corresponding circumferential movement angle based on the inner diameter of the aluminum shell. The circumferential relative movement speed or single dispensing time is determined by combining the preset coating amount and the calibrated dispensing flow rate of the spray head. This ensures that the circumferential relative movement parameters and dispensing parameters are matched to form a pre-coated area corresponding to the target pre-coated adhesive distribution during subsequent pre-coating processes.

[0032] 102. Insert the glue spray head into the aluminum shell and make the glue outlet position of the glue spray head move circumferentially relative to the inner peripheral wall of the aluminum shell. Output the pre-coated glue to the inner peripheral wall according to the circumferential relative motion parameters and glue outlet parameters to obtain a pre-coated glue area that conforms to the target pre-coated glue distribution.

[0033] The aluminum shell to be pre-applied with adhesive is conveyed to the pre-applied position and positioned so that the opening of the aluminum shell faces the spray nozzle. During positioning, the axis of the aluminum shell is made to be substantially coincident with the predetermined axis of rotation to reduce the change in distance between the inner peripheral wall and the spray nozzle during the rotation of the aluminum shell.

[0034] The drive nozzle extends into the aluminum housing through the opening, at an axial position corresponding to the target pre-applied adhesive distribution. The nozzle's outlet faces the inner circumferential wall of the aluminum housing, ensuring the output pre-applied adhesive falls at a predetermined position on the inner wall of the aluminum housing.

[0035] After the glue nozzle is positioned, the glue dispensing position of the nozzle is circumferentially moved relative to the inner circumferential wall of the aluminum shell. In one embodiment, the circumferential position of the glue nozzle can be kept constant, and the aluminum shell can be positioned by a rotating component and driven to rotate around its own axis. As the aluminum shell rotates, its inner circumferential wall passes through the glue dispensing position of the glue nozzle in sequence, thereby distributing the pre-coated glue output by the glue nozzle along the circumference of the aluminum shell. In another embodiment, the aluminum shell is kept stationary, and the glue dispensing position of the glue nozzle is driven to move around the axis of the aluminum shell, thereby causing the glue dispensing position to correspond sequentially to different circumferential positions on the inner circumferential wall of the aluminum shell.

[0036] During the circumferential relative motion, the dispensing parameters determined in step 101 are used to control the output of pre-coated adhesive from the spray nozzle, and the movement of the aluminum shell or spray nozzle is controlled according to the circumferential relative motion parameters. The output of pre-coated adhesive from the spray nozzle and the circumferential relative motion can start simultaneously, or the dispensing action and the circumferential relative motion can be started with a preset time difference based on the response time of the spray nozzle, so as to reduce insufficient adhesive application or localized adhesive buildup at the beginning of the pre-coated area.

[0037] The pre-coated area refers to the area where the pre-coated adhesive is applied to the inner wall of the aluminum shell before the formal glue filling. The pre-coated area meets the pre-set allowable range in terms of distribution pattern, coverage position and amount of adhesive.

[0038] After the pre-applied adhesive is applied, the adhesive dispensing from the nozzle and the circumferential relative movement are stopped, and the nozzle is driven out of the aluminum shell. The aluminum shell with the pre-applied adhesive area continues to be conveyed along the conveyor path to enter the subsequent core-filling and adhesive-filling processes.

[0039] Furthermore, this application provides a specific embodiment in which the dispensing position of the glue spray head and the inner peripheral wall of the aluminum shell undergo circumferential relative movement. In this embodiment, during the pre-coating process, the dispensing position of the glue spray head is kept constant relative to the circumferential position of the pre-coating station, and the aluminum shell is driven to rotate around its own axis, so that the inner peripheral wall of the aluminum shell moves circumferentially relative to the dispensing position of the glue spray head.

[0040] Specifically, after the aluminum shell is positioned, the adhesive spray head is inserted into the interior of the aluminum shell through its opening, aligning the adhesive dispensing position of the spray head with the area to be coated on the inner circumferential wall of the aluminum shell. Once the spray head reaches the predetermined position, its dispensing position remains constant relative to the circumferential position of the pre-coating station during circumferential movement. Subsequently, the aluminum shell is driven to rotate around its own axis. As the aluminum shell rotates, different circumferential portions on the inner circumferential wall of the aluminum shell sequentially pass through the adhesive dispensing position of the spray head. Simultaneously, the spray head outputs pre-coated adhesive to the inner circumferential wall of the aluminum shell. Because the dispensing position of the spray head remains stationary while the inner circumferential wall of the aluminum shell continues to rotate, the dispensing position of the spray head moves circumferentially relative to the inner circumferential wall of the aluminum shell, thereby applying the pre-coated adhesive to different circumferential portions of the inner circumferential wall of the aluminum shell.

[0041] During the rotation of the aluminum shell to a predetermined angle, the spray nozzle outputs pre-applied adhesive according to the desired pre-applied area. After completing the pre-applied area, the output of pre-applied adhesive stops, and the rotation of the aluminum shell is stopped. Subsequently, the spray nozzle retracts from the aluminum shell, the aluminum shell is released from its positioning, and it proceeds to the next process.

[0042] Furthermore, this application also provides another specific embodiment in which the dispensing position of the adhesive nozzle and the inner peripheral wall of the aluminum shell undergo circumferential relative movement. In this embodiment, during the pre-coating process, the position of the aluminum shell relative to the pre-coating station is kept constant, and the dispensing position of the adhesive nozzle is driven to move around the axis of the aluminum shell, so that the dispensing position of the adhesive nozzle moves circumferentially relative to the inner peripheral wall of the aluminum shell.

[0043] After the adhesive nozzle reaches the predetermined position inside the aluminum shell, it drives the adhesive dispensing position to move around the axis of the aluminum shell. That is, the dispensing position changes circumferentially around the axis of the aluminum shell, and the movement trajectory of the adhesive nozzle corresponds at least to the circumferential range of the area on the inner wall of the aluminum shell where pre-coated adhesive needs to be formed. As the adhesive dispensing position moves around the axis of the aluminum shell, it outputs pre-coated adhesive to the inner wall of the aluminum shell, coating the corresponding area on the inner wall of the aluminum shell with the circumferential movement of the dispensing position. Because the aluminum shell remains stationary while the dispensing position of the adhesive nozzle moves circumferentially, the dispensing position of the adhesive nozzle moves circumferentially relative to the inner wall of the aluminum shell.

[0044] The dispensing position of the spray nozzle moves around the axis of the aluminum shell. This can be achieved by driving the entire spray nozzle to move, or by driving the moving parts that support the dispensing end of the spray nozzle to move. The specific driving structure can be set according to the space of the pre-applied glue station, the type of spray nozzle, and the glue supply connection method. This embodiment does not impose specific limitations on this.

[0045] It should be noted that in this embodiment, if the entire spray nozzle moves, the glue supply connection part should be able to adapt to the circumferential movement of the spray nozzle to avoid hindering the delivery of the pre-coated glue due to the movement of the spray nozzle.

[0046] 103. Obtain the adhesive state parameters of the pre-coated area, and determine the allowable dispensing time period corresponding to the pre-coated area based on the adhesive state parameters.

[0047] Adhesive state parameters refer to parameters that reflect whether the pre-coated adhesive in the pre-coated area is suitable for bonding with the subsequent potting adhesive. Adhesive state parameters include at least one of the following: temperature of the pre-coated area, elapsed time since the formation of the pre-coated area, surface curing degree of the pre-coated adhesive, or viscosity.

[0048] The temperature of the pre-applied adhesive area can be directly detected by a temperature sensor corresponding to the inner wall of the aluminum shell, or it can be estimated based on the initial temperature of the pre-applied adhesive, the temperature of the aluminum shell, the ambient temperature, and the elapsed time. The elapsed time is counted from the moment the pre-applied adhesive is completed. The moment the pre-applied adhesive is completed is the moment the spray nozzle stops outputting pre-applied adhesive, the moment the last pre-applied adhesive sub-area is completed, or the moment the spray nozzle retracts from the aluminum shell.

[0049] The permitted glue-filling period refers to the time range during which the pre-coated area is in a state suitable for contact and bonding with the glue-filling material, and formal glue-filling is permitted.

[0050] 104. Insert the core into the aluminum shell and, within the permitted potting period, pour potting compound between the core and the aluminum shell, so that the potting compound comes into contact with the pre-coated area.

[0051] The core loading can be done manually or by a robotic arm; this embodiment does not limit the scope of the work.

[0052] After the core is installed, a potting space is formed between the outer periphery of the core and the inner wall of the aluminum shell for the potting adhesive to enter. The space between the core and the aluminum shell includes the space between the outer periphery of the core and the inner wall of the aluminum shell, and may also include the space between the bottom of the core and the bottom of the aluminum shell.

[0053] During the permitted potting period determined in step 103, potting compound is injected between the core and the aluminum shell. The potting compound enters the potting space between the core and the aluminum shell through the opening in the aluminum shell. When the potting compound reaches the pre-coated area, it comes into contact with the pre-coated material. Since the pre-coated material is still in a suitable bonding state at this time, the potting compound can fuse with the pre-coated material or form an adhesive interface between the two, thereby establishing a connection between the potting compound and the inner wall of the aluminum shell through the pre-coated area.

[0054] The amount of adhesive to be injected can be determined based on the internal dimensions of the aluminum shell, the volume of the core, and the predetermined injection height. Once the preset injection volume is reached, the injection of adhesive is stopped.

[0055] 105. Curing the pre-coated adhesive and the potting adhesive to form a fixed adhesive that connects the inner wall of the aluminum shell to the core.

[0056] After the potting is completed, the pre-coated adhesive and the potting adhesive inside the aluminum shell are cured. The curing process can be carried out by static curing, heat curing, cooling curing or staged curing, depending on the type of adhesive. This embodiment is not limited to a specific curing method.

[0057] In this embodiment, pre-applied adhesive is directly applied to predetermined positions on the bottom and sides of the aluminum shell before the core is inserted into the aluminum shell. Since the core does not obstruct the spray nozzle and adhesive flow path during pre-applied adhesive, the pre-applied adhesive can directly reach the inner wall of the aluminum shell and fully spread and adhere at the predetermined positions, thereby pre-forming a pre-applied adhesive layer that bonds with the inner wall of the aluminum shell.

[0058] The subsequently injected potting compound comes into contact with the pre-coated adhesive layer when it is in a state of permissible bonding, allowing the potting compound and the pre-coated adhesive to fuse together or form an adhesive interface. The fixed colloid formed by the solidification of the potting compound is then connected to the inner wall of the aluminum shell through the pre-coated adhesive layer. When the fixed colloid shrinks in volume during solidification, the pre-coated adhesive layer can maintain the interfacial connection between the fixed colloid and the inner wall of the aluminum shell, reducing the possibility of the fixed colloid partially separating from the inner wall of the aluminum shell due to shrinkage, thereby reducing the gap between the fixed colloid and the inner wall of the aluminum shell, and improving the support and constraint stability of the fixed colloid for the core.

[0059] Furthermore, this application provides a specific embodiment for determining circumferential relative motion parameters and adhesive dispensing parameters. This embodiment addresses the case where the target pre-coated adhesive distribution is a continuous annular distribution extending along the inner circumferential wall of the aluminum shell. An annular distribution means that the pre-coated adhesive area continuously covers the entire inner circumference of the aluminum shell. Please refer to [link to relevant documentation]. Figure 2 This embodiment includes the following steps: 201. Obtain the preset unit circumferential length adhesive application amount and the calibrated adhesive flow rate of the spray nozzle, and determine the target circumferential angular velocity based on the inner diameter of the aluminum shell, the preset unit circumferential length adhesive application amount, and the calibrated adhesive flow rate.

[0060] The preset adhesive application amount per unit circumferential length refers to the amount of pre-coated adhesive required per unit circumferential length when forming a ring-shaped pre-coated area on the inner circumferential wall of the aluminum shell. The calibrated adhesive flow rate of the spray nozzle refers to the amount of pre-coated adhesive output per unit time under set adhesive supply conditions. The calibrated adhesive flow rate is used to indicate the expected adhesive dispensing speed of the spray nozzle during this pre-coating process.

[0061] For aluminum shells from the same batch with identical adhesive supply conditions, the adhesive flow rate can be calibrated before processing begins, and the calibrated flow rate can be used to calculate the pre-coating parameters for that batch of aluminum shells. If the adhesive supply conditions change, calibration can be performed again.

[0062] The circumferential length corresponding to one circumference of the inner wall of the aluminum shell is determined by the inner diameter of the aluminum shell. This circumferential length is then multiplied by the preset adhesive amount per unit circumferential length to obtain the target total amount of adhesive required to form a ring-shaped pre-coated area.

[0063] When determining the target circumferential angular velocity that matches the preset unit circumferential length adhesive application amount and the calibrated adhesive flow rate, first determine the target circumferential linear velocity of the adhesive nozzle's dispensing position relative to the inner circumferential wall of the aluminum shell based on the ratio between the calibrated adhesive flow rate and the preset unit circumferential length adhesive application amount. Then, based on the relationship between the target circumferential linear velocity and the inner diameter of the aluminum shell, convert the target circumferential linear velocity into the target circumferential angular velocity.

[0064] The specific calculation can be performed using the following formula:

[0065]

[0066] The preset adhesive application amount per unit circumferential length is q, the calibrated adhesive flow rate is Q, the inner diameter of the aluminum shell is D, the target circumferential linear velocity is v, and the target circumferential angular velocity is w.

[0067] The target circumferential angular velocity refers to the angular velocity of the glue dispensing position of the spray nozzle relative to the inner circumferential wall of the aluminum shell during circumferential movement. When the circumferential position of the spray nozzle is kept constant while the aluminum shell is driven to rotate, the target circumferential angular velocity is the angular velocity of the aluminum shell relative to the spray nozzle's rotation; when the aluminum shell is kept stationary while the glue dispensing position of the spray nozzle is driven to move around the axis of the aluminum shell, the target circumferential angular velocity is the angular velocity of the glue dispensing position of the spray nozzle around the axis of the aluminum shell.

[0068] When the inner diameter of the aluminum shell increases in different batches, while the preset adhesive application amount per unit circumferential length and the calibrated adhesive flow rate remain unchanged, the total amount of pre-coated adhesive required to form a one-circumferential pre-coated area increases. In this case, the target circumferential angular velocity is reduced to extend the time required to complete one circumferential relative motion, allowing the spray nozzle to output sufficient pre-coated adhesive. Conversely, if the calibrated adhesive flow rate increases, while the inner diameter of the aluminum shell and the preset adhesive application amount per unit circumferential length remain unchanged, the target circumferential angular velocity is increased to avoid excessive accumulation of pre-coated adhesive per unit circumferential length.

[0069] 202. Set the circumferential relative motion angle to 360° and set the glue dispensing mode of the glue nozzle to continuous glue dispensing.

[0070] The circumferential relative motion angle refers to the angle covered by the glue dispensing position of the glue nozzle relative to the inner circumferential wall of the aluminum shell, starting from the initial position of the circumferential relative motion.

[0071] In this embodiment, the circumferential relative motion angle is defined as 360°, indicating that the glue dispensing position of the spray nozzle completes one revolution relative to the inner circumferential wall of the aluminum shell. When the aluminum shell rotates, it drives the aluminum shell to rotate 360° relative to the spray nozzle; when the aluminum shell remains stationary, it drives the glue dispensing position of the spray nozzle to move 360° around the axis of the aluminum shell.

[0072] Meanwhile, the glue dispensing mode of the glue spray head is determined to be continuous glue dispensing, that is, during the circumferential relative movement that forms the annular pre-coated glue area, the glue spray head continuously outputs pre-coated glue to the inner peripheral wall of the aluminum shell.

[0073] When the cumulative rotation angle approaches 360°, a stop dispensing command is issued in advance based on the closing delay of the glue spraying valve. For situations where it is necessary to avoid missing glue at the beginning and end of the annular pre-coated area, a predetermined overlap angle can be set so that the end position of the pre-coated area partially coincides with the beginning position.

[0074] Furthermore, this application provides another specific embodiment for determining circumferential relative motion parameters and adhesive dispensing parameters. This embodiment addresses a scenario where the target pre-coated adhesive distribution includes multiple pre-coated adhesive sub-regions spaced apart along the inner circumferential wall of the aluminum shell. The multiple pre-coated adhesive sub-regions are formed at different circumferential positions on the inner circumferential wall of the aluminum shell, with uncoated interval regions between adjacent pre-coated adhesive sub-regions. Please refer to [link to relevant documentation]. Figure 3 This embodiment includes the following steps: 301. Obtain the preset circumferential interval length between two adjacent pre-coated glue areas, the target glue amount of each pre-coated glue area, and the calibrated glue flow rate of the spray nozzle. Determine the target angular interval between two adjacent pre-coated glue areas based on the inner diameter of the aluminum shell and the preset circumferential interval length.

[0075] The preset circumferential interval length refers to the arc length of the circumferential interval between the reference positions of two adjacent pre-coated adhesive areas along the inner circumferential wall of the aluminum shell, which is measured along the inner circumferential wall of the aluminum shell. In this embodiment, the center position of each pre-coated adhesive area is used as the reference position of the corresponding pre-coated adhesive area.

[0076] The target angle interval refers to the central angle formed by the reference positions of two adjacent pre-coated adhesive areas relative to the axis of the aluminum shell. Specifically, the preset circumferential interval length is compared with the circumference of the inner wall of the aluminum shell, and the circumferential interval expressed in length is converted into a circumferential interval expressed in angle.

[0077] The target angle interval can be determined by the following formula:

[0078] Wherein, the preset circumferential interval length is L, and the target angular interval is... θ, θ The unit is degrees.

[0079] Additionally, if radians are used, the target angle interval... θ =2L / D.

[0080] The target adhesive application amount for each pre-coated adhesive sub-area refers to the amount of pre-coated adhesive material that needs to be output within the corresponding pre-coated adhesive sub-area. Different pre-coated adhesive sub-areas can use the same target adhesive application amount, or different target adhesive application amounts can be used according to the bonding requirements of the corresponding positions.

[0081] 302. Determine the target circumferential position corresponding to each pre-coated glue area based on the target angle interval.

[0082] In this embodiment, a preset starting position is first determined from the target pre-coated adhesive distribution, and this preset starting position is used as the target circumferential position of the first pre-coated adhesive sub-region. Then, the target angular intervals determined in step 301 are sequentially accumulated along the predetermined circumferential movement direction to determine the target circumferential positions of subsequent pre-coated adhesive sub-regions. For example, if the target circumferential position corresponding to the first pre-coated adhesive sub-region is recorded as zero degrees and the target angular interval is θ, then the target circumferential position of the second pre-coated adhesive sub-region is θ, the target circumferential position of the third pre-coated adhesive sub-region is 2θ, and so on to determine the target circumferential positions of the remaining pre-coated adhesive sub-regions.

[0083] The preset starting position can be determined relative to a predetermined positioning reference on the aluminum shell, so that the pre-coated adhesive area corresponding to the position can be repeatedly formed on different aluminum shells.

[0084] If the circumferential interval lengths between different adjacent pre-coated sub-regions in the target pre-coated adhesive distribution are different, each circumferential interval length can be converted into a corresponding target angle interval, and the target circumferential position of each pre-coated sub-region can be determined sequentially according to each target angle interval.

[0085] 303. Determine the corresponding single dispensing time based on the target amount of adhesive applied to each pre-coated sub-area and the calibrated dispensing flow rate.

[0086] The single dispensing time refers to the duration during which the nozzle outputs pre-coated adhesive at a target circumferential position. For any pre-coated sub-area, the target amount of adhesive applied to that sub-area is divided by the nozzle's rated dispensing flow rate to obtain the single dispensing time corresponding to that sub-area.

[0087] When the target adhesive amount is the same for each pre-coated area, the same single dispensing time can be used for each pre-coated area; when the target adhesive amount is different for each pre-coated area, the corresponding single dispensing time is determined separately. This ensures that the spray nozzle outputs pre-coated adhesive at each target circumferential position, matching the corresponding target adhesive amount.

[0088] For example, if the target amount of adhesive for a certain pre-coated area is 0.2 ml, and the calibrated dispensing flow rate of the nozzle is 0.1 ml per second, then the dispensing time for a single application to that pre-coated area is 2 seconds. The nozzle continuously dispenses adhesive for 2 seconds at the corresponding target circumferential position, then stops dispensing, thus outputting the pre-coated adhesive corresponding to the target amount.

[0089] 304. The circumferential relative motion mode is determined to make the glue dispensing position of the glue nozzle move sequentially to each target circumferential position, and the glue dispensing mode of the glue nozzle is determined to dispense glue intermittently at each target circumferential position.

[0090] In this embodiment, based on the target circumferential positions determined in step 302, the glue dispensing position of the glue spraying head is controlled to generate a circumferential relative movement with the inner circumferential wall of the aluminum shell, so that the glue dispensing position of the glue spraying head sequentially reaches each target circumferential position.

[0091] Intermittent dispensing refers to the dispensing head only dispensing pre-coated adhesive after reaching the corresponding target circumferential position, and stopping dispensing pre-coated adhesive as it moves from one target circumferential position to the next.

[0092] The pre-coated adhesive applied at each target circumferential position adheres to the inner circumferential wall of the aluminum shell, forming pre-coated sub-areas at the corresponding positions. Uncoated intervals are maintained between adjacent pre-coated sub-areas, thus forming multiple pre-coated sub-areas spaced apart along the inner circumferential wall of the aluminum shell.

[0093] After dispensing adhesive at the last target circumferential position, the circumferential relative movement stops, and the dispensing head retracts from the aluminum shell. Thus, by separately controlling each target circumferential position and the corresponding dispensing time, multiple pre-coated adhesive sub-areas can be formed on the inner circumferential wall of the aluminum shell at predetermined circumferential intervals, and each pre-coated adhesive sub-area can obtain pre-coated adhesive material corresponding to its target amount.

[0094] Furthermore, this application provides a specific embodiment for detecting and replenishing adhesive in pre-coated areas. This embodiment addresses the issue of missed areas or insufficient adhesive application during the actual pre-coating process, and involves replenishing adhesive before the actual core assembly and filling. Please refer to [link to relevant documentation]. Figure 4 This embodiment includes the following steps.

[0095] 401. Detect the actual glue distribution in the pre-coated area, compare the actual glue distribution with the target pre-coated glue distribution, and determine the glue-deficient area and the corresponding circumferential position.

[0096] After pre-coating, the pre-coated adhesive on the inner circumferential wall of the aluminum shell is inspected to obtain the actual adhesive distribution in the pre-coated area. The actual adhesive distribution refers to the position, coverage area, and amount of pre-coated adhesive actually formed on the inner circumferential wall of the aluminum shell, including the circumferential position, circumferential coverage length, and axial width of the actual pre-coated area.

[0097] Specifically, an image of the adhesive coating on the inner wall of the aluminum shell can be acquired through an image acquisition device, and the area where the pre-coated adhesive is actually attached can be identified based on the differences in color, grayscale, or reflective properties between the pre-coated adhesive and the inner wall of the aluminum shell.

[0098] During the comparison, under the same aluminum shell position reference, the actual pre-coated area is compared with the predetermined target position, target coverage area, and target coating amount. A missing coating area refers to an area where the target pre-coated coating distribution requires the presence of pre-coated material, but no pre-coated area is actually formed, or the actual coating amount does not meet the target requirements.

[0099] The circumferential position of the adhesive-deficient area refers to its location relative to the aluminum shell's positioning reference point on the circumference of the aluminum shell. The circumferential position can be represented by the starting and ending angles, or by the center angle and circumferential coverage angle of the adhesive-deficient area. For example, if the target pre-coated adhesive distribution requires the formation of a pre-coated sub-area within a 60° to 80° range on the inner circumference of the aluminum shell, but actual testing results show that pre-coated adhesive is only formed within a 60° to 70° range, then the 70° to 80° range can be identified as the adhesive-deficient area, and this angular range can be defined as the corresponding circumferential position of the adhesive-deficient area.

[0100] 402. Based on the circumferential position corresponding to the glue-deficient area, align the glue dispensing position of the glue nozzle with the glue-deficient area, and determine the glue replenishment parameters based on the difference between the glue-deficient area and the target pre-coated glue distribution. Replenish the glue in the glue-deficient area according to the glue replenishment parameters.

[0101] After determining the area lacking adhesive and its circumferential position, adjust the relative circumferential position between the spray nozzle and the aluminum shell so that the pre-coated adhesive output from the spray nozzle can reach the area lacking adhesive.

[0102] The glue replenishment parameters determined by the difference between the glue-deficient area and the target pre-coated glue distribution include one or more of the following: glue replenishment location, glue replenishment amount, glue replenishment flow rate, glue replenishment duration, glue replenishment coverage angle, and glue replenishment dispensing mode.

[0103] When the glue-deficient area is characterized by a lack of pre-coated adhesive within a certain circumferential range, the glue coverage angle can be determined based on the starting and ending circumferential positions of the glue-deficient area. The glue outlet position of the spray nozzle is then moved relative to the inner circumferential wall of the aluminum shell along this glue coverage angle. During this movement, pre-coated adhesive is output to fill the missing circumferential section.

[0104] Through the above-mentioned detection and glue replenishment process, targeted glue replenishment can be carried out on the location and degree of glue deficiency in the area before formal core loading and glue filling, thereby improving the conformity between the actual glue distribution and the target pre-coated glue distribution.

[0105] Furthermore, this application provides a specific embodiment for determining the permissible dispensing period based on the state parameters of the adhesive compound. This embodiment determines whether the pre-coated adhesive compound is in a suitable state for bonding with the subsequent dispensing adhesive compound by jointly determining the elapsed time and temperature. This embodiment is described in detail below.

[0106] The adhesive state parameters include the elapsed time since the formation of the pre-coated area and the temperature of the pre-coated area. The time period during which the elapsed time does not exceed the preset bonding time and the temperature of the pre-coated area is within the preset bonding temperature range is defined as the allowable dispensing period.

[0107] The duration of the pre-coated adhesive layer reflects the time elapsed after it adheres to the inner wall of the aluminum shell, used to determine whether the pre-coated adhesive has exceeded the suitable time range for bonding with subsequent potting adhesive due to pre-curing, surface changes, or other reasons. The temperature of the pre-coated area reflects the current temperature state of the pre-coated adhesive, used to determine whether its flowability and bonding state meet the requirements for subsequent potting. The temperature of the pre-coated area can be obtained through temperature detection devices corresponding to the pre-coated area. For example, the surface temperature of the pre-coated adhesive can be directly detected, or the temperature of the aluminum shell wall corresponding to the pre-coated area can be detected, and this temperature can be used as a parameter characterizing the temperature state of the pre-coated area.

[0108] When the pre-coated adhesive area comprises multiple pre-coated adhesive sub-areas, the temperature of each pre-coated adhesive sub-area can be measured separately. If the temperature of each pre-coated adhesive sub-area is within the preset bonding temperature range, the pre-coated adhesive area is considered to meet the temperature requirements. Alternatively, if the lowest temperature among the multiple pre-coated adhesive sub-areas is not lower than the lower limit of the preset bonding temperature range, and the highest temperature is not higher than the upper limit of the preset bonding temperature range, then the temperature of each pre-coated adhesive sub-area is determined to meet the requirements.

[0109] The preset bonding time and preset bonding temperature range are determined in advance based on the material properties of the pre-coated adhesive and the potting process. Specifically, the bonding performance of the pre-coated adhesive can be calibrated before formal production. Under different time periods and temperature conditions after the pre-coated area is formed, the pre-coated adhesive and the potting adhesive are brought into contact and cured. Based on whether they can form a continuous colloid or meet the preset interface bonding requirements, the suitable time range and temperature range for bonding the pre-coated adhesive with the potting adhesive are determined, and the preset bonding time and preset bonding temperature range are determined separately. For different types of pre-coated adhesives or different process conditions, the corresponding parameters can be calibrated separately and stored.

[0110] During the actual glue application process, the elapsed time and temperature of the pre-coated area are continuously or periodically monitored. When the elapsed time does not exceed the preset bonding time and the temperature of the pre-coated area is within the preset bonding temperature range, it indicates that the pre-coated material is still in a suitable state for bonding with the glue application material. The time period that simultaneously meets the above time and temperature conditions is determined as the allowable glue application period. For multiple aluminum shells processed using the same glue and the same process conditions, the pre-calibrated preset bonding time and preset bonding temperature range can be used together.

[0111] Furthermore, this application provides a specific embodiment for reactivating a pre-coated adhesive area. This embodiment addresses situations where the pre-coated adhesive has exceeded the initial permissible bonding time limit, but the bonding state can still be restored by heating. This embodiment includes: When the time exceeds the preset bonding time but does not exceed the preset activation time, and the temperature of the pre-coated area is lower than the lower limit of the preset bonding temperature range, the pre-coated area is heated. When the temperature returns to the preset bonding temperature range, the preset secondary bonding time from the time the temperature returns to the preset time is determined as the updated allowable potting time. During the updated allowable potting time, the core is installed into the aluminum shell and the potting compound is poured in.

[0112] The preset activation time refers to the longest time that the pre-coated adhesive can recover to a suitable bonding state through heating from the formation of the pre-coated area. The preset activation time is longer than the preset bonding time. When the time has elapsed but has not exceeded the preset bonding time, the adhesive is applied according to the aforementioned allowable application period, and no reactivation is required. When the time has elapsed but has exceeded the preset activation time, the corresponding aluminum shell is transferred to the re-coating or abnormal handling process.

[0113] When the elapsed time exceeds the preset bonding time but does not exceed the preset activation time, and the temperature of the pre-coated area is below the lower limit of the preset bonding temperature range, it indicates that the pre-coated adhesive has exited the initial permissible dispensing period, but is still within the time range where it can be reactivated. At this time, the pre-coated area is heated to raise its temperature.

[0114] During heating, the shell wall corresponding to the pre-coated adhesive area can be heated from the outside of the aluminum shell, with the aluminum shell transferring heat to the pre-coated adhesive. Alternatively, hot air or radiant heat can be supplied to the pre-coated adhesive area from the opening side of the aluminum shell. The temperature of the pre-coated adhesive area is monitored during heating. Once the detected temperature reaches the lower limit of the preset bonding temperature range, it is determined that the temperature of the pre-coated adhesive area has returned to the preset bonding temperature range, and heating is stopped or the heating power is reduced to prevent the temperature from exceeding the upper limit of that range.

[0115] The moment when the temperature recovers to the preset bonding temperature range is designated as the temperature recovery moment. Timing restarts from this moment, and the time period from the temperature recovery moment to the preset secondary bonding duration is defined as the updated permissible dispensing period. The preset secondary bonding duration refers to the permissible time during which the pre-coated adhesive, after reheating, can maintain a suitable bonding state with the dispensing adhesive; it is predetermined based on the material properties of the pre-coated adhesive and its reactivated state.

[0116] It should be noted that the pre-coated adhesive in this embodiment is thermoplastic, meaning it can melt and regain its activity after heating, such as thermoplastic copolyamide hot melt adhesive.

[0117] Therefore, while the pre-coated adhesive still has the ability to be reactivated, its bonding state can be restored by heating, avoiding the direct discarding of aluminum shells that have already been pre-coated due to production delays or temperature drops.

[0118] This embodiment applies to adhesives that can regain their softened state or interfacial adhesion after initial pre-coating by reheating, such as thermoplastic copolyamide hot melt adhesives. For adhesives that cannot regain their bonding ability by reheating after curing, the reactivation process described in this embodiment is not used.

[0119] Furthermore, this application provides a specific embodiment of a staged potting compound application. In this embodiment, the pre-coated compound and the potting compound are the same compound, so that they can fuse together upon contact and form a continuous, fixed colloid during the subsequent curing process. Please refer to [link to relevant documentation]. Figure 5 This embodiment includes the following steps: 501. Pour in the potting adhesive according to the first potting flow rate until the amount poured in reaches the preset contact amount. The preset contact amount is determined based on the space between the core and the aluminum shell and the position of the pre-coated area, so that the potting adhesive comes into contact with the pre-coated area.

[0120] After the core is inserted into the aluminum shell, a potting space is formed between the outer circumference of the core and the inner circumference of the aluminum shell. Potting compound is poured into this potting space according to the first potting flow rate, so that the potting compound gradually fills the potting space between the core and the aluminum shell at a lower flow rate.

[0121] The preset contact amount refers to the amount of adhesive required to reach and contact the pre-coated area. When determining the preset contact amount, the starting position is the location where the adhesive begins to accumulate, and the lower edge of the pre-coated area is the target position. The fillable space between the starting position and the target position, defined by the inner wall of the aluminum shell and the outer surface of the core, is determined, and the volume of this fillable space is defined as the preset contact amount.

[0122] For example, when the pre-coated area is located at the lower part of the inner wall of the aluminum shell, the preset contact adhesive amount can be calculated based on the space defined by the inner wall of the aluminum shell, the outer peripheral surface of the core, the bottom of the aluminum shell, and the lower edge of the pre-coated area.

[0123] During the dispensing process, when the amount of dispensing reaches the preset contact amount, it is considered that the dispensing adhesive has reached the pre-coated area.

[0124] 502. Continue to inject the glue at a second glue flow rate greater than the first glue flow rate until the preset glue volume is reached, so that the glue can bond with the pre-coated glue within the preset bonding temperature range.

[0125] The first dispensing flow rate is lower than the second dispensing flow rate, thereby reducing the direct impact of the dispensing adhesive on the pre-coated adhesive and lowering the possibility of displacement or local accumulation of the pre-coated adhesive. Once the dispensing volume reaches the preset contact amount, the pre-coated area begins to contact the newly dispensing adhesive of the same type. At this point, the pre-coated area remains within the preset bonding temperature range, allowing the two adhesive components to fuse at the contact point.

[0126] Subsequently, the glue flow rate is increased from the first flow rate to the second flow rate, and glue continues to be poured into the glue-filling space. The preset glue volume is the total amount of glue required to complete this glue-filling operation, which can be determined based on the internal volume of the aluminum shell, the volume occupied by the core, and the target glue-filling height. Glue filling is stopped when the cumulative glue volume reaches the preset glue volume.

[0127] For example, the preset contact adhesive amount is the first part of the total dispensing amount. First, this part of the adhesive is output at the first dispensing flow rate; after the cumulative dispensing amount reaches the preset contact adhesive amount, the flow rate is switched to a larger second dispensing flow rate to complete the dispensing of the remaining adhesive.

[0128] This embodiment controls the initial contact process between the glue and the pre-coated area by using a first glue flow rate, and then uses a larger second glue flow rate to complete the remaining filling after the two have established contact. This reduces the disturbance of the pre-coated area by the initial glue application and avoids reducing production efficiency by using a low flow rate throughout the glue application process.

[0129] Furthermore, this application provides a specific embodiment for pre-dispensing adhesive from the spray nozzle before formal pre-coating. Pre-dispensing is triggered when the spray nozzle's standby state might affect dispensing stability. Please refer to [link to relevant documentation]. Figure 6 This embodiment includes the following steps: 601. Obtain the standby status information of the glue spray head, and determine whether the glue spray head meets the preset glue discharge conditions based on the standby status information.

[0130] Standby status information is used to reflect the status of the spray nozzle since the last dispensing of glue, including at least one of the following: dispensing time, spray nozzle temperature, and glue supply pressure.

[0131] The duration of dispensing interruption begins from the moment the dispensing head stops dispensing for the first time. The temperature of the dispensing head is obtained from a temperature sensor located on the dispensing head or the dispensing line, and the dispensing pressure is obtained from a pressure sensor located on the dispensing line.

[0132] The preset dispensing conditions are used to determine whether insufficient dispensing, flow fluctuations, or flow interruptions may occur when the dispensing head restarts. For example, if the dispensing stop time reaches the preset idle time, the dispensing head temperature is lower than the lower limit of the preset dispensing temperature range, or the dispensing pressure is not within the preset dispensing pressure range, the dispensing head is determined to meet the preset dispensing conditions.

[0133] If the glue nozzle does not meet the preset glue discharge conditions, it indicates that the glue nozzle is still in a stable glue dispensing state, and pre-glue discharge can be skipped, directly proceeding to the aluminum shell pre-coating process. If the preset glue discharge conditions are met, then proceed to step 602.

[0134] 602. If the preset glue discharge conditions are met, the residual glue receiving mechanism is moved to below the glue spray head, and the glue spray head is controlled to output pre-coated glue to the residual glue receiving mechanism.

[0135] The residual adhesive receiving mechanism is used to collect the adhesive output from the spray nozzle during the pre-dispensing process, preventing this portion of the adhesive from falling onto the aluminum shell to be processed or the pre-coating station. The residual adhesive receiving mechanism includes an adhesive receiving container and a drive component that moves the adhesive receiving container.

[0136] After confirming that the spray nozzle meets the preset glue discharge conditions, the residual glue receiving mechanism is moved below the spray nozzle, aligning the receiving port of the glue container with the dispensing port of the spray nozzle. Once the residual glue receiving mechanism is confirmed to be in position, the spray nozzle begins to output pre-coated glue. This prevents unstable glue from being used to form the pre-coated area.

[0137] 603. After the actual glue dispensing state of the glue nozzle meets the preset stable glue dispensing conditions, control the glue nozzle to stop dispensing pre-coated glue and make the residual glue receiving mechanism retract from under the glue nozzle.

[0138] The actual glue dispensing status of the spray nozzle is obtained during the pre-dispensing process. The actual glue dispensing status includes the actual glue flow rate, glue dispensing continuity, and glue supply pressure. The actual glue flow rate is obtained through a flow detection device, or it can be determined based on the actual glue dispensing volume within a predetermined detection time; glue dispensing continuity is judged by detecting whether there is an interruption in the output glue flow.

[0139] The preset stable dispensing condition can be set as follows: the actual dispensing flow rate is continuously within the preset flow rate range for a preset stable duration, and there is no flow interruption within this preset stable duration. Furthermore, the dispensing pressure can be required to be within the preset dispensing pressure range.

[0140] For example, the target dispensing flow rate is 0.10 ml / s, the preset flow rate range is 0.09 ml to 0.11 ml / s, and the preset stabilization time is 2 seconds. When the actual dispensing flow rate is detected to be within the above range for 2 consecutive seconds without any interruption, it is determined that the actual dispensing state meets the preset stable dispensing conditions.

[0141] Once the preset stable dispensing conditions are met, the dispensing nozzle is closed, temporarily stopping the output of pre-coated adhesive. The residual adhesive receiving mechanism is then driven to retract from beneath the nozzle, creating space for the nozzle to extend into the aluminum housing. Subsequently, the nozzle is inserted into the aluminum housing to be pre-coated and the actual dispensing begins.

[0142] Therefore, in this embodiment, abnormal adhesive material and gas in the adhesive supply channel are discharged before the adhesive nozzle enters the aluminum shell, so that the formal pre-coating starts from a more stable adhesive dispensing state, reducing the occurrence of missing adhesive or insufficient adhesive at the beginning of the pre-coating area.

[0143] Please see Figures 7 to 10 This application provides an embodiment of a potting system for a bolt-type aluminum electrolytic capacitor, the embodiment comprising: The assembly comprises a conveying component 01, a rotating component 02, a pre-applied adhesive component 03, a core-filling component 04, and a dispensing component 05. The pre-applied adhesive component 03 and the dispensing component 05 are sequentially arranged with the conveying component 01 along the conveying direction of the aluminum shell 06. The rotating component 02 is correspondingly arranged with the pre-applied adhesive component 03, and is used to position the aluminum shell 06 and drive it to rotate around its own axis. The pre-applied adhesive component 03 includes a spray nozzle 07 and a pre-applied adhesive supply mechanism connected to the spray nozzle 07. The spray nozzle 07 can extend into the aluminum shell 06 positioned by the rotating component 02, and output pre-applied adhesive to a predetermined position on the inner wall of the aluminum shell 06 during the rotation of the aluminum shell 06 to form a pre-applied area 08; the core assembly 04 and the potting assembly 05 are correspondingly arranged. The core assembly 04 is used to load the core into the aluminum shell 06 with the pre-applied area 08 formed, and the potting assembly 05 is used to pour potting adhesive between the core and the aluminum shell 06 so that the potting adhesive comes into contact with the pre-applied area 08.

[0144] The conveying assembly 01 extends along a predetermined conveying direction to sequentially convey multiple aluminum shells 06 to be processed to their corresponding processing positions. The aluminum shells 06 are arranged with their openings facing upwards on the conveying assembly 01, and are spaced apart along the conveying direction. The conveying assembly 01 includes a conveying track, a conveyor belt, and a conveying drive component. The conveyor belt is disposed on the conveying track, and the conveying drive component is driven by the conveyor belt to move the aluminum shells 06.

[0145] The conveying assembly 01 is equipped with transfer components 09 corresponding to each processing position. When the aluminum shell 06 arrives at the corresponding processing position, the transfer component 09 transfers the aluminum shell 06 from the conveying path to the processing position of the corresponding assembly. After the corresponding processing is completed, the aluminum shell 06 is either moved back to the conveying path or directly transferred to the next processing position.

[0146] The pre-applied adhesive assembly 03 and the dispensing assembly 05 are sequentially arranged with the conveying assembly 01 along the conveying direction of the aluminum shell 06. The pre-applied adhesive position corresponding to the pre-applied adhesive assembly 03 is located upstream of the dispensing position corresponding to the dispensing assembly 05, so that a pre-applied adhesive area 08 is formed on the inner peripheral wall of the aluminum shell 06 before the core is inserted and the formal dispensing is performed.

[0147] The rotating assembly 02 and the pre-applied adhesive assembly 03 are respectively positioned at the pre-applied adhesive location. The rotating assembly 02 can be installed on one side of the conveying assembly 01 or disposed on the conveying path, and is used to receive and position the aluminum shell 06 to be pre-applied adhesive. The rotating assembly 02 includes a positioning member and a rotating drive member disposed below the positioning member. The positioning member is used to support the aluminum shell 06 and restrict the radial movement of the aluminum shell 06 relative to the positioning member. The rotating drive member is used to drive the positioning member and the aluminum shell 06 it supports to rotate around the axis of the aluminum shell 06 itself.

[0148] The pre-applied adhesive assembly 03 is positioned above or to the side of the rotating assembly 02, and includes a spray nozzle 07 and a pre-applied adhesive supply mechanism. The pre-applied adhesive supply mechanism is connected to the spray nozzle 07 via a supply pipe and is used to supply pre-applied adhesive to the spray nozzle 07. The pre-applied adhesive supply mechanism includes an adhesive storage container, an adhesive pump, and corresponding supply piping. The adhesive pump is connected between the adhesive storage container and the spray nozzle 07 and is used to supply adhesive to the spray nozzle 07 according to set dispensing parameters.

[0149] The nozzle of the adhesive spray head 07 faces the inner peripheral wall of the aluminum shell 06, which is positioned by the rotating assembly 02. To allow the adhesive spray head 07 to extend into and out of the aluminum shell 06, the pre-applied adhesive assembly 03 includes a moving drive and a guide. The guide extends in a direction close to or away from the aluminum shell 06, and the adhesive spray head 07 is mounted on a movable seat on the guide. The moving drive is connected to the movable seat and is used to drive the adhesive spray head 07 to move along the guide. Specifically, the moving drive is a vertically extending lifting mechanism.

[0150] After the glue spray head 07 extends into the aluminum shell 06, its glue outlet reaches the axial position corresponding to the target pre-coated glue distribution and is spaced apart from the inner peripheral wall of the aluminum shell 06. The rotary drive drives the aluminum shell 06 to rotate around its own axis, so that different circumferential parts on the inner peripheral wall of the aluminum shell 06 pass through the glue outlet position of the glue spray head 07 in sequence. At the same time, the pre-coated glue supply mechanism supplies pre-coated glue to the glue spray head 07, and the glue spray head 07 outputs the pre-coated glue to a predetermined position on the inner peripheral wall of the aluminum shell 06, thereby forming a continuous annular or spaced pre-coated glue area 08.

[0151] After the pre-applied adhesive is applied, the pre-applied adhesive supply mechanism stops supplying adhesive, the spray nozzle 07 retracts from the aluminum shell 06, and the rotating component 02 stops driving the aluminum shell 06 to rotate and releases its positioning. Subsequently, the conveying component 01 delivers the aluminum shell 06 with the pre-applied adhesive area 08 to the core loading and glue filling position.

[0152] The core loading assembly 04 is positioned above the conveying assembly 01 and includes a core carrying section, a core picking and placing section, and a core loading drive section. The core picking and placing section is connected to the core loading drive section, which drives the core picking and placing section to move between the core picking position and the core loading position of the aluminum shell 06. After picking up the core to be assembled, the core picking and placing section moves the core above the opening of the aluminum shell 06, and then descends along the axial direction of the aluminum shell 06 to load the core into the aluminum shell 06, where the pre-applied adhesive area 08 is formed.

[0153] The core-filling assembly 04 and the glue-filling assembly 05 are positioned at the same processing location, allowing the aluminum shell 06 to undergo core-filling and glue-filling sequentially at the same location. The glue-filling assembly 05 includes a glue-filling head and a glue-filling supply mechanism connected to the glue-filling head. The glue-filling supply mechanism includes a glue storage section, a glue-filling pump, and a glue-filling pipeline. The glue-filling head is connected to the glue-filling pump via the glue-filling pipeline. The glue-filling head is positioned above the aluminum shell 06 with the core already inserted, and its glue outlet faces the glue-filling space between the core and the aluminum shell 06. The glue-filling head can be connected to a lifting drive component to move closer to the opening of the aluminum shell 06 or extend into the glue-filling space according to glue-filling requirements.

[0154] It should be noted that when the pre-applied adhesive and the potting adhesive are made of the same material, they can share a single adhesive storage compartment.

[0155] After the core is assembled, the potting assembly 05 injects potting compound into the space between the core and the aluminum shell 06. The potting compound enters the potting space between the outer circumference of the core and the inner circumference of the aluminum shell 06, and gradually reaches the pre-coated area 08 as the injection volume increases. When the pre-coated compound is in a permissible bonding state, the potting compound contacts and bonds with the pre-coated area 08. After the preset potting volume is reached, the potting assembly 05 stops dispensing the compound, and the potting head withdraws from the aluminum shell 06.

[0156] In this embodiment, the rotating assembly 02 and the pre-applied adhesive assembly 03 work together to allow the spray nozzle 07 to apply pre-applied adhesive to different circumferential areas of the inner wall of the aluminum shell 06 while maintaining a predetermined dispensing position. The pre-applied adhesive assembly 03, the core-loading assembly 04, and the potting assembly 05 are arranged in a corresponding order to the conveying assembly 01, enabling the aluminum shell 06 to form a pre-applied adhesive area 08 directly attached to the inner wall before core loading, and allowing the potting adhesive to contact this pre-applied adhesive area 08 after core loading. After curing, the pre-applied adhesive and the potting adhesive form a fixing adhesive that connects the inner wall of the aluminum shell 06 to the core, thereby improving the effective bonding between the fixing adhesive and the inner wall of the aluminum shell 06 and achieving continuous processing of pre-applied adhesive, core loading, and potting adhesive.

[0157] The dispensing system also includes a control component. The control component is connected to the conveying component 01, the rotating component 02, the pre-applied glue supply mechanism, the moving drive of the glue spray head 07, the core assembly component 04, and the dispensing component 05, respectively, and is used to control the conveying of the aluminum shell 06, the positioning and rotation of the aluminum shell 06, the lifting and lowering of the glue spray head 07, the pre-applied glue, the core assembly, and the dispensing process.

[0158] The control component stores the aluminum shell 06 size information and target pre-coated adhesive distribution corresponding to different product models. It retrieves the corresponding size information according to the selected product model, and determines the rotation parameters of the rotating component 02 and the dispensing parameters of the pre-coated adhesive supply mechanism based on the size information, calibrated dispensing flow rate and target coating amount.

[0159] The dispensing system also includes a temperature detection element and a timing module. The temperature detection element is correspondingly set to the pre-applied adhesive area 08 and is used to detect the temperature of the pre-applied adhesive area 08 or the temperature of the aluminum shell 06 wall that can characterize the temperature of the pre-applied adhesive area 08. The timing module is used to record the formation time and elapsed time of the pre-applied adhesive area 08. The control component determines whether core loading and dispensing are allowed based on the elapsed time and temperature, and controls the conveying component 01 to convey the aluminum shell 06 to the core loading and dispensing position based on the determination result.

[0160] The dispensing system also includes an image detection component, a heating component, and a residual adhesive receiving mechanism. The image detection component is located at or downstream of the pre-application position and is used to detect the actual adhesive distribution in the pre-application area 08. The heating component is used to heat the pre-application area 08, which is still within a preset activation time. The residual adhesive receiving mechanism is movably located below the dispensing head 07 and is used to receive the adhesive discharged before the formal pre-application.

[0161] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

Claims

1. A potting method for a bolt-type aluminum electrolytic capacitor, characterized in that, include: Obtain the size information of the aluminum shell and the target pre-coated adhesive distribution, and determine the circumferential relative motion parameters and adhesive dispensing parameters based on the size information and the target pre-coated adhesive distribution; The glue nozzle is inserted into the aluminum shell, and the glue outlet position of the glue nozzle is made to move circumferentially relative to the inner peripheral wall of the aluminum shell. The pre-coated glue is output to the inner peripheral wall according to the circumferential relative movement parameters and the glue outlet parameters to obtain a pre-coated glue area that conforms to the target pre-coated glue distribution. Obtain the adhesive state parameters of the pre-coated area, and determine the allowable dispensing time period corresponding to the pre-coated area based on the adhesive state parameters; The core is inserted into the aluminum shell, and during the permitted potting period, potting compound is poured between the core and the aluminum shell, so that the potting compound comes into contact with the pre-coated area; The pre-coated adhesive and the potting adhesive are cured to form a fixed adhesive that connects the inner wall of the aluminum shell to the core.

2. The potting method according to claim 1, characterized in that, The step of causing the glue dispensing position of the glue spray head to move circumferentially relative to the inner peripheral wall of the aluminum shell includes: Keeping the position of the spray nozzle relative to the pre-applied adhesive station unchanged, drive the aluminum shell to rotate around its own axis, so that the adhesive outlet position of the spray nozzle moves circumferentially relative to the inner peripheral wall of the aluminum shell. Alternatively, keeping the position of the aluminum shell unchanged, drive the glue dispensing position of the glue spraying head to move around the axis of the aluminum shell, so that the glue dispensing position of the glue spraying head moves circumferentially relative to the inner peripheral wall of the aluminum shell.

3. The potting method according to claim 1, characterized in that, The target pre-coated adhesive is distributed in a ring shape that extends continuously along the inner peripheral wall of the aluminum shell; The step of determining the circumferential relative motion parameters and adhesive dispensing parameters based on the size information and the target pre-coated adhesive distribution includes: Obtain the preset unit circumferential length of adhesive application and the calibrated adhesive flow rate of the spray nozzle, and determine the target circumferential angular velocity based on the inner diameter of the aluminum shell, the preset unit circumferential length of adhesive application, and the calibrated adhesive flow rate. The circumferential relative motion angle is set to 360°, and the glue dispensing mode of the glue spray head is set to continuous glue dispensing.

4. The potting method according to claim 1, characterized in that, The target pre-coated adhesive distribution includes multiple pre-coated adhesive sub-regions spaced apart along the inner peripheral wall of the aluminum shell; The step of determining the circumferential relative motion parameters and adhesive dispensing parameters based on the size information and the target pre-coated adhesive distribution includes: The preset circumferential interval length between two adjacent pre-coated glue areas, the target glue amount of each pre-coated glue area, and the calibrated glue flow rate of the spray nozzle are obtained. The target angular interval corresponding to the two adjacent pre-coated glue areas is determined according to the inner diameter of the aluminum shell and the preset circumferential interval length. The target circumferential position corresponding to each of the pre-coated glue areas is determined according to the target angle interval; The corresponding single dispensing time is determined based on the target amount of adhesive applied to each pre-coated sub-area and the calibrated dispensing flow rate. The circumferential relative motion mode is determined to move the glue dispensing position of the glue spray head sequentially to each of the target circumferential positions, and the glue dispensing mode of the glue spray head is determined to dispense glue intermittently at each of the target circumferential positions.

5. The potting method according to claim 1, characterized in that, Before obtaining the adhesive state parameters of the pre-coated area, the dispensing method further includes: The actual glue distribution in the pre-coated area is detected, and the actual glue distribution is compared with the target pre-coated glue distribution to determine the glue-deficient area and the circumferential position corresponding to the glue-deficient area. Based on the circumferential position corresponding to the glue-deficient area, the glue dispensing position of the glue nozzle is aligned with the glue-deficient area. The glue replenishment parameters are determined based on the difference between the glue-deficient area and the target pre-coated glue distribution, and glue is replenished to the glue-deficient area according to the glue replenishment parameters.

6. The potting method according to claim 1, characterized in that, The adhesive state parameters include the elapsed time since the formation of the pre-coated area and the temperature of the pre-coated area; The step of determining the allowable dispensing time period corresponding to the pre-coated area based on the adhesive state parameters includes: The time period during which the elapsed time does not exceed the preset bonding time and the temperature of the pre-coated area is within the preset bonding temperature range is defined as the allowable glue application period.

7. The potting method according to claim 6, characterized in that, When the time exceeds the preset bonding time but does not exceed the preset activation time, and the temperature of the pre-coated area is lower than the lower limit of the preset bonding temperature range, the pre-coated area is heated. When the temperature recovers to the preset bonding temperature range, the preset secondary bonding time from the time of temperature recovery is determined as the updated allowable potting time period, and the core is installed into the aluminum shell and the potting adhesive is poured in during the updated allowable potting time period.

8. The potting method according to claim 6, characterized in that, The pre-coated adhesive and the potting adhesive are the same adhesive; The step of injecting potting compound between the core and the aluminum shell includes: The potting adhesive is poured in according to the first potting flow rate until the amount poured in reaches the preset contact amount. The preset contact amount is determined based on the space between the core and the aluminum shell and the position of the pre-coated area, so that the potting adhesive comes into contact with the pre-coated area. Continue injecting the glue at a second injection flow rate greater than the first injection flow rate until the preset injection volume is reached, so that the glue can bond with the pre-coated glue within the preset bonding temperature range.

9. The potting method according to claim 1, characterized in that, Before inserting the adhesive nozzle into the aluminum shell, the adhesive application method further includes: Obtain the standby status information of the glue spray head, and determine whether the glue spray head meets the preset glue discharge conditions based on the standby status information; If the preset glue discharge conditions are met, the residual glue receiving mechanism is moved below the glue spray head, and the glue spray head is controlled to output pre-coated glue to the residual glue receiving mechanism; After the actual glue dispensing state of the glue spray head meets the preset stable glue dispensing conditions, the glue spray head is controlled to stop dispensing pre-coated glue, and the residual glue receiving mechanism is moved out from under the glue spray head.

10. A potting system for a bolt-type aluminum electrolytic capacitor, characterized in that, include: Conveying components, rotating components, pre-applied adhesive components, core-filling components, and potting components; The pre-coating assembly and the dispensing assembly are sequentially arranged corresponding to the conveying assembly along the aluminum shell conveying direction; The rotating component is correspondingly arranged with the pre-applied adhesive component. The rotating component is used to position the aluminum shell and drive the aluminum shell to rotate around its own axis. The pre-applied adhesive assembly includes a spray nozzle and a pre-applied adhesive supply mechanism connected to the spray nozzle. The spray nozzle can extend into an aluminum shell positioned by the rotating assembly and output pre-applied adhesive to a predetermined position on the inner wall of the aluminum shell during the rotation of the aluminum shell to form a pre-applied adhesive area. The core-loading assembly and the glue-filling assembly are respectively arranged. The core-loading assembly is used to load the core into the aluminum shell with the pre-coated area, and the glue-filling assembly is used to fill the space between the core and the aluminum shell with glue material so that the glue material contacts the pre-coated area.

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