Capacitor screening system and capacitor screening method

Abstract

The invention discloses a capacitor screening system and a capacitor screening method. The system comprises a capacitor stripping device and an adsorption feeding device. The stripping device comprises a rotary driving assembly, a carrier tape clamping mechanism and a capacitor check block, a driving wheel and a driven wheel clamp a carrier tape, the rotary driving assembly drives the carrier tape to move, and a capacitor attached to the carrier tape is stably conveyed; the capacitor baffle blocks accurately strip the capacitor in the moving process, so that the capacitor is separated from the carrier tape and enters a to-be-loaded area; the adsorption feeding device adopts a vacuum adsorption mode and the like to stably carry the separated capacitor to a subsequent station; according to the device, the impact problem caused by a traditional vibration feeding mode is effectively avoided, and structural damage such as shell cracks, medium dislocation or lead loosening of the capacitors in the transportation process can be prevented, so that the integrity and the performance stability of the high-precision capacitors in the screening process are guaranteed, the screening quality and the yield are remarkably improved, and the production cost is reduced. The device is especially suitable for the screening process of high-reliability electronic components.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitor screening systems and methods, and particularly to a capacitor screening system and a capacitor screening method. Background Art

[0002] A capacitor screening system is a special device used for screening, detecting, and sorting capacitors. It mainly measures and judges the electrical performance parameters of capacitors (such as capacitance, loss tangent, insulation resistance, withstand voltage performance, etc.) through automated or semi-automated means, and classifies or rejects unqualified products according to preset standards.

[0003] In the modern electronic manufacturing process, capacitors, as key basic components, directly affect the stability and reliability of the entire machine. The application of a capacitor screening system can significantly improve the screening efficiency and accuracy, avoid human errors and missed detections caused by manual screening, and ensure product quality from the source. In addition, this device is conducive to establishing a perfect quality traceability system, optimizing the process flow, reducing production costs and repair rates. Therefore, the capacitor screening system plays an irreplaceable and important role in ensuring the consistency of electronic products and enhancing the production competitiveness of enterprises.

[0004] The utility model patent with the authorization announcement number CN220277587U discloses a capacitor screening system with adjustable specifications. As Figure 1 shown, it includes a base 1, shock-absorbing columns 2, a mounting frame 3, a first sieve tray 4, a second sieve tray 5, and a vibration motor 9. Shock-absorbing columns 2 are fixedly installed at the four corners of the base 1. Above the base 1, there is a mounting frame 3. At the top of the mounting frame 3, there is a first sieve tray 4. Inside the first sieve tray 4, there is a second sieve tray 5. In the middle of the front side of the first sieve tray 4, there is a regulator 6. Below the first sieve tray 4, there is a receiving tray 7. On the lower surface of the receiving tray 7, there is a motor base 8, and a vibration motor 9 is installed on the motor base 8.

[0005] The purpose of this utility model is to set the second sieve tray inside the first sieve tray and adjust the position of the second sieve tray by adjusting the cooperation with the transmission gear through the regulator. The digital display on the regulator can display the adjusted length, so as to accurately control the misalignment size between the first sieve holes and the second sieve holes, and then realize the function of screening capacitors of different specifications. The screened capacitors can slide through the receiving tray to the collection port without stopping to collect the capacitors.

[0006] Similarly, the utility model patent with the authorization announcement number CN222369585U discloses a screening device for the production of chip capacitors. As Figure 2As shown in the figure, it includes a housing 1. A platform 2 is fixedly connected to the bottom of the housing 1 for supporting the housing 1. A fixed frame 3 is fixedly connected to one side of the housing 1 for fixing a vibration motor 4. A vibration motor 4 is fixedly connected inside the fixed frame 3 for generating vibrations. A screen 5 is arranged inside the housing 1 for screening. A fixed block 6 is arranged on one side of the screen 5 for fixing the screen 5. A moving block 7 is arranged on the surface of the fixed block 6 for controlling the movement of a slider 8. A slider 8 is fixedly connected to the bottom of the moving block 7 for enabling the moving block 7 to move. A chute 9 is arranged inside the fixed block 6 for the movement of the slider 8. A return spring 10 is fixedly connected inside the chute 9 for resetting the slider 8. A connecting rod 11 is fixedly connected to one side of the fixed block 6 for connecting a connecting shaft 14. A vibration spring 12 is fixedly connected to the bottom of the fixed block 6 for enhancing the vibration effect. A support plate 13 is fixedly connected to the bottom of the vibration spring 12 for supporting the vibration spring 12. A connecting shaft 14 is fixedly connected to one side of the connecting rod 11 for connecting the vibration motor 4. A support rod 15 is fixedly connected to the bottom of the platform 2. A bottom plate 16 is arranged at the bottom of the support rod 15 for shock absorption. A shock absorption spring 17 is fixedly connected inside the bottom plate 16 for shock absorption. A damping column 18 is fixedly connected inside the bottom plate 16.

[0007] The utility model patent aims to reduce the generated vibrations by setting up a shock absorption device, and strengthen the shock absorption effect through the damping column sleeved with the shock absorption spring, reduce the vibrations generated by the equipment, and enhance the stability of the equipment.

[0008] Inside the chip capacitor (MLCC), there are alternating stacks of ceramic dielectric layers and metal electrode layers, which form an integral body after high-temperature sintering. Its characteristics are large structural rigidity, strong brittleness, and poor resistance to mechanical shock. In particular, it is prone to internal cracks, delamination, or terminal electrode detachment under the action of impact or excessive acceleration. In order to push the materials forward, the vibration feeding equipment usually applies high-frequency and short-stroke mechanical shocks. The capacitors are repeatedly bounced and collided on the vibrating bowl or screen, which easily causes microscopic cracks, scratches, or even chipping on themselves or between each other. Especially for chip capacitors, in multiple cycles of vibration, the originally tiny internal stress may accumulate into irreversible damage, gradually evolving into insulation degradation, breakdown, capacitance value drift, or short-circuit faults. Therefore, the existing vibration feeding is likely to cause irreversible damage inside the capacitor.

[0009] It can be seen that the existing technology still needs to be improved and developed. Summary of the Invention

[0010] In view of the above deficiencies of the existing technology, the purpose of the present invention is to provide a capacitor screening system and a capacitor screening method, aiming to solve the problem that the existing capacitor screening system is prone to cause irreversible damage inside the capacitor when feeding materials by vibration.

[0011] The technical solution of the present invention is as follows:

[0012] A capacitance screening system, comprising: a capacitance stripping device and an adsorption feeding device. The capacitance stripping device includes: a rotation driving assembly, a carrier tape clamping mechanism, and a capacitance stripping mechanism. The carrier tape clamping mechanism includes a driving wheel and a driven wheel. The rotation driving assembly is used to drive the driving wheel to rotate, and the driven wheel is attached to the driving wheel to clamp the carrier tape. The capacitance stripping mechanism includes a capacitance stopper, and the capacitance stopper is used to block the capacitance so that the capacitance is separated from the carrier tape. The adsorption feeding device is used to adsorb and feed the capacitance separated from the carrier tape.

[0013] The effect of the above solution is as follows: By setting the capacitance stripping device and the adsorption feeding device, the present invention avoids the mechanical impact on the capacitance during the traditional vibrating feeding process, thus effectively solving the problem that vibrating feeding easily causes damage to the internal structure of the capacitance. Specifically, the capacitance stripping device utilizes the clamping transmission of the carrier tape between the driving wheel and the driven wheel to achieve stable conveyance of the capacitance attached to the carrier tape. During this process, there is no need to apply vibration or impact force to the capacitance. The setting of the capacitance stopper can accurately strip the capacitance during the movement of the carrier tape, causing it to fall off the carrier tape and into a controllable area, providing conditions for subsequent adsorption feeding. The entire stripping process is stable and controllable, avoiding problems such as cracks in the capacitance shell, misalignment of the internal dielectric layer, and even loosening of the leads caused by severe jitter. In addition, the adsorption feeding device realizes the handling and positioning of the capacitance through non-rigid clamping methods such as vacuum adsorption, further reducing the influence of mechanical stress on the capacitance, thereby improving the reliability and yield rate of the capacitance screening process. Therefore, through a series of non-impact actions, the present invention realizes flexible feeding and precise screening of the capacitance, effectively ensuring the structural integrity and performance stability of high-precision capacitors.

[0014] In a further preferred solution, a first rotating shaft penetrates through the middle of the driven wheel, and the first rotating shaft is connected to a second rotating shaft through a connecting plate, and the second rotating shaft is rotatably connected to the machine frame.

[0015] The effect of the above scheme is that: the present invention sets a first rotating shaft in the middle of the passive wheel, and connects it with the second rotating shaft through a connecting plate, so that the passive wheel can not only realize the passive rotation of the synchronous clamping carrier with the active wheel, but also can be adjusted relative to the frame within a certain range through the second rotating shaft, so as to provide elasticity or angle compensation space for the clamping force of the passive wheel, and enhance the adaptability of the device to carriers of different thicknesses or materials. Moreover, the connection plate is set between the first rotating shaft and the second rotating shaft to form a certain flexible connection structure, so that when there is a thickness deviation or local unevenness of the carrier, the passive wheel can be slightly swung or the clamping angle can be adjusted without leaving the active wheel, so as to maintain a stable clamping effect, and avoid the poor transmission of the carrier or the error of capacitor stripping due to uneven local clamping. In addition, the structure is also convenient for the maintenance, replacement and assembly of the passive wheel, and improves the stability and operability of the overall equipment. Therefore, the above arrangement not only improves the dynamic adaptability and clamping stability of the clamping mechanism, but also further ensures the stability and precision of the capacitor transmission and stripping process, and effectively reduces the risk of mis-stripping, tape jamming or capacitor damage caused by abnormal clamping.

[0016] In a further preferred embodiment, the second rotation axis is higher than the first rotation axis.

[0017] The effect of the above scheme is that by setting the second rotating shaft at a position higher than the first rotating shaft, the first rotating shaft and the connected passive wheel tend to sag in the installed state, thereby forming a natural clamping force driven by gravity in the structure. When the driving wheel rotates to drive the carrier to run, the passive wheel automatically presses against the driving wheel under the action of gravity, and reliable clamping can be achieved without the need for additional clamping mechanisms such as springs or cylinders, which simplifies the mechanism design, reduces the number of moving parts, and improves the overall reliability and service life of the device. In addition, the swing space brought by the height difference cooperates with the connecting plate structure, so that the passive wheel can produce a slight displacement in the vertical direction when it is stressed, thereby adapting to the uneven surface caused by the thickness error or local warping of the carrier, and avoiding the problem of excessive clamping force causing the carrier to be crushed or too small to cause the clamp to be loose. Therefore, by setting the second rotating shaft higher than the first rotating shaft, not only adaptive clamping control is achieved, but also the compatibility and operation stability of the system with carriers of different specifications are improved, fundamentally ensuring the continuity and high precision of the capacitor stripping process.

[0018] In a further preferred embodiment, one side of the connecting plate is connected to an elastic element, and the other end of the elastic element is connected to the frame.

[0019] The effects of the above solution are as follows: By setting an elastic element on one side of the connecting plate and connecting the other end thereof to the frame, while the passive wheel achieves basic pressing under natural gravity, a compensating pressure from the elastic element is further obtained. The elastic element is stretched during the downward swing of the passive wheel, thereby applying a continuous restoring force to the connecting plate. This restoring force is superimposed with gravity to form a stable clamping force, which not only enhances the clamping reliability of the carrier tape between the driving wheel and the passive wheel, but also has an adaptive adjustment ability. That is, when there are thickness variations in the local area of the carrier tape or when there is jitter during operation, the elastic element can automatically buffer the position change of the passive wheel through stretching or compression, thereby avoiding the problem of tape slippage caused by insufficient clamping force or tape deformation and even capacitor damage caused by excessive clamping force. In addition, the elastic element can also absorb a certain degree of mechanical shock and vibration, improving the stability and service life of the entire device during long-term operation. Therefore, the above setting not only simplifies the design of the voltage regulating structure, improves the flexible adjustment ability of the device, but also significantly enhances the adaptability during the carrier tape conveying process and the continuity and safety of the capacitor stripping action.

[0020] In a further preferred solution, there are two connecting plates, and the two connecting plates are connected together by a fixing frame.

[0021] The effects of the above solution are as follows: By setting two connecting plates and connecting them together by a fixing frame, the passive wheel has higher stability and symmetry in structure. Compared with single-side connection, the double-connecting plate structure can provide more balanced supporting force during the loading process of the passive wheel, thereby avoiding the problem of the passive wheel yawing or tilting caused by single-point loading. In addition, the setting of the fixing frame forms a rigid connection between the two connecting plates in space, further improving the anti-deformation ability and installation consistency of the overall structure, ensuring that the rotation axis of the passive wheel always remains parallel to the driving wheel, and improving the smoothness and reliability of the carrier tape clamping transmission. In practical applications, the double-connecting plate and the fixing frame can effectively prevent clamping deviation during the operation of the carrier tape, avoid the occurrence of tape deviation or jamming phenomena, thereby improving the overall operation accuracy and stability of the capacitor stripping device, and further improving the accuracy and yield rate of subsequent capacitor adsorption feeding and sorting processes. Therefore, the above setting is not only more stable in mechanical structure, but also has better synchronism and reliability during dynamic operation, enhancing the robustness and engineering adaptability of the entire system.

[0022] In a further preferred solution, a plurality of grooves are formed on the outer edge of the driving wheel, and the plurality of grooves are arranged at intervals.

[0023] The effects of the above solution are as follows: By evenly arranging grooves on the outer edge of the driving wheel at intervals, a meshing drive structure is formed with the positioning holes on both sides of the carrier tape, improving the synchronization and positioning accuracy of the carrier tape transmission. The grooves correspond one by one to the carrier tape positioning holes. When the driving wheel rotates, the carrier tape is pulled to move through the meshing of the grooves and the positioning holes, avoiding the problems of carrier tape deviation or misalignment caused by slipping in traditional friction drive, so as to ensure that the capacitor stripping mechanism can always align with the capacitor position in the carrier tape groove and improve the accuracy of the stripping action. At the same time, the design of arranging the grooves at intervals forms discrete contact areas on the surface of the driving wheel, reducing the friction area between the carrier tape and the driving wheel, reducing the risk of wear on the surface of the carrier tape while ensuring the reliability of transmission, and further ensuring the integrity of the carrier tape and the physical safety of the capacitor during the capacitor stripping process. Therefore, the above settings not only achieve high-precision and low-damage carrier tape drive control, but also provide a basic guarantee for the stability of the capacitor stripping and subsequent feeding processes.

[0024] In a further preferred solution, the longitudinal section of the groove is in an inverted triangle shape, and the bottom side length on the side close to the capacitor stopper is greater than the bottom side length on the side away from the capacitor stopper.

[0025] The effects of the above solution are as follows: By designing the longitudinal section of the groove into an inverted triangle structure and making the bottom side length on the side close to the capacitor stopper greater than the bottom side length on the side away from the capacitor stopper, it can effectively guide the carrier tape to be at a certain angle or posture during the transmission process, thereby making the orientation of the capacitor more stable and unified. The setting of the inverted triangle structure can provide a wedge-shaped guiding force when clamping the carrier tape, making the edge of the carrier tape gradually fit the groove shape during the process of entering the groove, thereby reducing the possibility of jumping or deviation; and the design of unequal bottom sides further guides the carrier tape to tilt slightly towards the capacitor stopper side, making the capacitors attached to the surface of the carrier tape be arranged more closely to the edge when approaching the stopper, which is beneficial to form an effective contact between the capacitor and the capacitor stopper, ensuring that the capacitor can be smoothly and accurately blocked and stripped. In addition, this structure can also form a local limiting effect during the driving process of the carrier tape, preventing the carrier tape from misaligning in the clamping area due to inertial swing, so as to improve the repeatability and stability of the stripping action. Therefore, this groove structure not only enhances the guiding accuracy of the carrier tape drive, but also creates favorable conditions for the subsequent stable stripping of the capacitor, thereby improving the reliability and consistency of the overall capacitor screening system.

[0026] In a further preferred solution, the capacitor screening system further includes: a capacitance detection device, and the capacitance detection device includes: a capacitor pin clamping mechanism and a measurement bracket. The measurement bracket is used to carry the capacitor body of the capacitor to be measured, and it is inclined; the capacitor pin clamping mechanism is used to clamp the capacitor pins from both sides after the capacitor to be measured is placed on the measurement bracket.

[0027] The effects of the above solution are as follows: The measurement bracket is used to carry the capacitor body to be measured and is inclined. This is to achieve self-positioning when the capacitor falls into the measurement position, enabling the capacitor to automatically slide to the bottom area of the measurement bracket under the action of gravity, ensuring its stable posture and consistent pin orientation, thereby improving the subsequent clamping accuracy; the inclined structure also facilitates the natural contact of the capacitor body against the surface of the bracket, reducing the need for additional limiting structures and simplifying the overall structural design. The capacitor pin clamping mechanism is used to clamp the two pins of the capacitor from both sides. On the basis that the capacitor body is already stably carried by the measurement bracket, the clamping actions on both sides can ensure that the clamping position is aligned with the capacitor pins, thereby ensuring the stability of electrical connection and the accuracy of measurement data. At the same time, this clamping process is a non-rigid push rather than an impact closure, further reducing the risk of mechanical damage to the capacitor pins. Therefore, through the cooperation of guiding and positioning, inclined support, and precise clamping, this detection structure realizes the automatic adjustment of the capacitor posture and the high reliability of the detection contact, improving both the test efficiency and the accuracy of test data.

[0028] In a further preferred solution, the capacitor screening system further includes: a capacitor taping device, which is used to accommodate the measured capacitors in different regions according to the capacitance values of the measured capacitors; the adsorption feeding device is also used to move the measured capacitors to the predetermined partitions of the capacitor taping device according to the measured capacitance values.

[0029] The effects of the above solution are as follows: By adding a capacitor taping device to the capacitor screening system and enabling the adsorption feeding device to have a classification and movement function, the full-process automation and refined management of the capacitor screening process are realized. The capacitor taping device can ensure that components with different capacitance values are sorted in an orderly manner, facilitating subsequent automatic packaging, assembly, or finished product shipment; this classification and taping not only improve the efficiency of capacitor use but also reduce the manual sorting error rate. At the same time, after completing the previous conveying task, the adsorption feeding device continues to undertake the classification and sorting task of the capacitors. According to the capacitance value information fed back by the measuring device, it accurately moves the capacitors to the corresponding partitions of the taping device, thus realizing the continuous transfer process of the capacitors from detection to classification. Since the adsorption feeding device uses a non-rigid adsorption method to handle the capacitors, it can effectively avoid secondary impact or damage to the capacitors during the handling process, ensuring that the structure and performance of the detected capacitors are still stable and reliable when entering the taping stage. Therefore, through the linkage between the adsorption feeding device and the capacitor taping device, the automation degree of the system, the material sorting efficiency, and the overall quality control ability of capacitor screening are further improved in the output stage, effectively supporting the flexible processing requirements of large-batch and high-precision capacitor products.

[0030] A capacitor screening method, which includes the following steps:

[0031] The capacitance stripping device strips the capacitance to be detected from the carrier tape through a rotary drive assembly, a carrier tape clamping mechanism, and a capacitance stripping mechanism;

[0032] The adsorption feeding device adsorbs the stripped capacitance to be detected and then transfers and feeds it to the capacitance value detection device;

[0033] The capacitance value detection device clamps and fixes the pins of the capacitance to be detected on the measurement bracket through a capacitance pin clamping mechanism, and performs capacitance value detection;

[0034] The adsorption feeding device adsorbs the capacitance after the capacitance value detection is completed according to the detected capacitance value and then transfers it to a predetermined partition of the capacitance taping device.

[0035] The effects of the above solution are as follows: In the first step, the capacitance stripping device drives the carrier tape clamping mechanism with the help of the rotary drive assembly to stably transport the carrier tape. At the same time, the capacitance stopper in the capacitance stripping mechanism realizes the precise stripping of the capacitance from the carrier tape without applying violent impact, avoiding the possible damage to the capacitance structure caused by mechanical vibration. In the second step, the adsorption feeding device stably transfers the stripped capacitance to the detection area in a non-rigid adsorption manner, effectively reducing the impact and static electricity accumulation during the handling process, thus ensuring the integrity and electrical performance of the capacitance to be detected. In the third step, the capacitance value detection device accurately positions and fixes the capacitance through the capacitance pin clamping mechanism. After the pins are clamped, it is reliably connected to the measurement circuit. At the same time, due to the inclined setting of the measurement bracket, the placement stability of the capacitance can be improved and rolling off can be avoided, improving the detection efficiency and measurement stability. In the fourth step, the adsorption feeding device adsorbs the capacitance according to the measurement results and orderly transfers it to the predetermined partition of the capacitance taping device, thus achieving the goal of automatic classification according to the capacitance value, and improving the organization level in the discharging stage and the convenience of subsequent use. Therefore, through the fine cooperation and flexible operation among multiple links, this method not only significantly reduces the risk of mechanical damage to the capacitance body, but also realizes an efficient and highly consistent automated screening process, thus effectively ensuring the quality controllability and reliability of high-precision capacitance products in large-scale applications.

[0036] Compared with the prior art, the capacitance screening system provided by the present invention includes: a capacitance stripping device and an adsorption feeding device. The stripping device includes a rotary drive assembly, a carrier tape clamping mechanism, and a capacitance stopper. Among them, the driving wheel and the driven wheel clamp the carrier tape, and the carrier tape is driven to move through the rotary drive assembly to stably transport the capacitors attached thereto. The capacitance stopper accurately strips the capacitors during the movement process, causing them to break away from the carrier tape and enter the area to be fed. The adsorption feeding device uses methods such as vacuum adsorption to smoothly transport the separated capacitors to the subsequent workstations. This device effectively avoids the impact problems caused by the traditional vibration feeding method, prevents structural damages such as shell cracks, dielectric misalignment, or lead loosening of the capacitors during transportation, thereby ensuring the integrity and performance stability of high-precision capacitors during the screening process, significantly improving the screening quality and the yield rate, and is particularly suitable for the screening process of high-reliability electronic components. Brief Description of the Drawings

[0037] Figure 1 is a schematic structural diagram of a multi-frequency combiner disclosed in CN106207347B in the prior art.

[0038] Figure 2 is a schematic structural diagram of a POI combiner module disclosed in CN206564316U in the prior art.

[0039] Figure 3 is a schematic structural diagram of the capacitance screening system in a preferred embodiment of the present invention.

[0040] Figure 4 is a schematic structural diagram of the tape placement rack used in the capacitance screening system of the present invention.

[0041] Figure 5 is a schematic structural diagram of the capacitance stripping device used in the capacitance screening system of the present invention.

[0042] Figure 6 is a schematic structural diagram of the driving wheel used in the capacitance screening system of the present invention.

[0043] Figure 7 is Figure 6 an enlarged view of the partial area A in

[0044] Figure 8 is a schematic structural diagram of the capacitance value detection device used in the capacitance screening system of the present invention.

[0045] Figure 9 is a schematic structural diagram of the adsorption feeding device used in the capacitance screening system of the present invention.

[0046] Figure 10 is a schematic structural diagram of the capacitance taping device used in the capacitance screening system of the present invention. Detailed Description of the Preferred Embodiments

[0047] The present invention provides a capacitance screening system and a capacitance screening method. To make the objectives, technical solutions and effects of the present invention clearer and more definite, the following further elaborates on the present invention by way of examples with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0048] As a common and large - quantity passive component in electronic circuits, surface - mount capacitors are widely packaged in a tape - and - reel manner during modern electronic manufacturing. This packaging method not only meets the standardized requirements such as JEITA and EIA, but is also widely adopted due to its high efficiency and high reliability in mass production. Capacitor components are sequentially embedded into equally - spaced grooves on a carrier tape through a mechanical feeding method, and are encapsulated with a cover tape to prevent falling off. Subsequently, the whole is wound into a roll - shaped structure, which greatly saves transportation and storage space and also ensures continuous and high - speed feeding for automatic pick - and - place machines in the surface - mount production line. Through the coordinated cooperation of the carrier - tape stepping structure, capacitors can achieve precise positioning and stable transfer during the mounting process, thereby ensuring the mounting accuracy and the yield rate. It is one of the most commonly used standard packaging methods for current small and medium - sized electronic components.

[0049] The tape - and - reel structure has significant advantages in the mounting link, but faces non - negligible limitations in the screening stage. Since the embedding structure of capacitors in the carrier tape is relatively tight, if the traditional vibration peeling method is used for extraction, a relatively large external force is often required to overcome the frictional resistance between the capacitor and the carrier tape. Repeated mechanical impacts will not only cause micro - cracks on the capacitor surface, but also easily lead to irreversible damages such as dislocation of the internal structure of the ceramic layer, deformation or loosening of the capacitor leads, especially for capacitor components with high - precision and high - stability requirements, such as high - Q multi - layer ceramic capacitors or temperature - compensating capacitors, their performance will fluctuate or even fail due to this. In addition, the uncontrollable direction of the capacitor during the peeling process also makes subsequent detection and classification more complicated.

[0050] To overcome the above - mentioned technical problems, the present invention provides a capacitance screening system with a novel structure and stable operation. In a preferred embodiment of the present invention, as Figure 3As shown, the system mainly includes a rack 100, a capacitor stripping device 300, an adsorption loading device 400, a capacitance detection device 500 and a capacitor taping device 600, forming an integrated and highly automated screening process. The functions of each device are clearly divided and they cooperate with each other, which not only ensures the smooth stripping of the capacitor from the carrier tape, but also completes parameter detection and classified storage under the premise of non-destructive handling throughout the process, effectively avoiding component damage and detection errors caused by mechanical impact or chaotic removal posture in traditional methods. Among them, the frame 100 is used as a carrier of other devices, the capacitor stripping device 300 is used to strip the capacitor to be tested from the carrier tape through the rotating drive component 310, the carrier tape clamping mechanism and the capacitor stripping mechanism; the adsorption and loading device 400 is used to adsorb the stripped capacitor to be tested and then transfer it to the capacitance detection device 500; and the capacitance detection device 500 is used to clamp the pins of the capacitor to be tested and fix them on the measuring bracket through the capacitor pin clamping mechanism, and perform capacitance value detection; in addition, the adsorption and loading device 400 is also used to adsorb the capacitor whose capacitance value has been detected according to the detected capacitance value and then transfer it to the predetermined partition of the capacitor taping device 600.

[0051] A tape placement rack 200 is disposed on one side of the frame 100. The tape placement rack 200 includes a height bracket 210, a limiting disc 220, and a tape rotating shaft 230. Figure 4 As shown, the height bracket 210 is used to make the height value of the tape greater than the capacitor stripping device 300, and the limiting disc 220 is sleeved on the outer edge of the tape shaft 230 to prevent the tape from falling out from one side; the tape shaft 230 is connected to the height bracket 210 and is used to pass the tape so that the tape is fixed thereon. In the specific implementation, in order to ensure the stable feeding of the tape during the stripping process, the tape placement rack 200 is arranged on the upper side of the frame 100, which can provide a continuous and stable carrier release path without occupying the core operating space below. The limiting disc 220 can be fixed at both ends of the tape shaft 230 by a threaded knob or a buckle, which can effectively limit the lateral movement of the tape and improve the coaxiality and smoothness of the tape rotation. The tape shaft 230 is supported by a low-friction bearing, which can rotate freely under a slight traction force, and automatically release the carrier tape in accordance with the subsequent stripping rhythm to ensure the smooth connection of the overall stripping and feeding process. As mentioned above, the capacitor stripping device 300 is disposed at the downstream position of the tape path, and is mainly used to achieve accurate stripping of the capacitor from the carrier tape.

[0052] Preferably, the carrier tape clamping mechanism includes a pair of driving wheels 320 and driven wheels 330 disposed opposite to each other. Figure 5 As shown, the driving wheel 320 is driven by a rotating drive assembly 310 (such as Figure 5Driven by the rotation, the carrier tape is driven to be conveyed forward. The driven wheel 330 is arranged on the side opposite to the driving wheel 320. It is attached to the outer circumferential surface of the driving wheel 320 through its own structural design, forming a pressing fit structure with the driving wheel 320, so as to realize the clamping and fixing of the carrier tape. The driven wheel 330 can be arranged on the bracket through a rotating shaft and apply a constant pressing force to the driving wheel 320 under the action of a certain elastic structure to adapt to carrier tapes of different thicknesses or materials.

[0053] The rotation driving assembly 310 can be selected from a servo motor, a stepper motor or a DC motor with a reduction device, and is connected to the driving wheel 320 through a coupling or a pulley structure to drive the driving wheel 320 to rotate at a set pitch, so as to control the step feeding of the carrier tape. By reasonably setting the motion control parameters of the rotation driving assembly 310, it can be ensured that the step length of each feeding is consistent with the pitch of the capacitor arrangement on the carrier tape, realizing precise feeding and preventing displacement errors from affecting the subsequent peeling action.

[0054] The capacitor peeling mechanism is arranged in the middle of the carrier tape conveying path and is used to peel the capacitor element out of the groove 321 (as Figure 6 shown) when the carrier tape moves forward to a specific position. The peeling mechanism includes a capacitor stopper 370 arranged above the running path of the carrier tape, as Figure 7 shown. The capacitor stopper 370 is fixedly installed on the frame 100 and is located at the end of the movement track of the chip capacitor. When the carrier tape is conveyed forward under the action of the rotation driving assembly 310, the chip capacitor will be blocked by the capacitor stopper 370 during the continuous forward movement. Since the carrier tape continues to move forward while the capacitor is blocked and does not move, the capacitor gradually detaches from the carrier tape groove 321, realizing the peeling operation. Figure 5 shown. The capacitor stopper 370 is fixedly installed on the frame 100 and is located at the end of the movement track of the chip capacitor. When the carrier tape is conveyed forward under the action of the rotation driving assembly 310, the chip capacitor will be blocked by the capacitor stopper 370 during the continuous forward movement. Since the carrier tape continues to move forward while the capacitor is blocked and does not move, the capacitor gradually detaches from the carrier tape groove 321, realizing the peeling operation.

[0055] Specifically, in order to enhance the clamping stability, a first rotating shaft penetrates through the middle of the driven wheel 330. The first rotating shaft is connected to the second rotating shaft through an adapter plate 340 (as Figure 5 shown). The second rotating shaft is rotatably installed on the frame 100. Among them, the installation height of the second rotating shaft is higher than that of the first rotating shaft, which is convenient for the driven wheel 330 to form a clamping angle, so as to more reliably press the carrier tape. Further, in order to improve the structural self-adaptability and anti-vibration performance, an elastic element 350 (as Figure 5As shown, the other end of the elastic element 350 is fixed to the frame 100. When the carrier tape is unevenly stressed or has dimensional tolerances, the elastic element 350 can automatically adjust the position of the driven wheel 330 to ensure an appropriate clamping force and reduce the risk of abnormal peeling. In addition, to improve the stability of the overall structure, two connecting plates 340 are provided and connected and fixed by a fixing frame 360 to ensure the overall rigidity and synchronism during the operation of the system. In the structure of the driving wheel 320, to further cooperate with the limiting and orientation of the capacitor position, a plurality of grooves 321 arranged at intervals are provided on its outer edge. The longitudinal section of each groove 321 is an inverted triangle, and the bottom side length on the side close to the capacitor stopper 370 is longer than the bottom side length on the side away from the stopper. This structure can effectively control the position of the capacitor during transportation, making the force concentrated and the obstruction clear when it runs to the stopper, so as to improve the accuracy and stability of the peeling action.

[0056] The peeled capacitor is picked up by the adsorption feeding device 400 and transferred to the capacitance detection device 500. The adsorption feeding device 400 can adopt a vacuum chuck structure or other adsorption structures suitable for handling precision electronic components to ensure the handling operation is completed without damaging the capacitor body and pins. The adsorption feeding device 400 also has a two-way movement function, which can not only transfer the capacitor from the peeling position to the detection position, but also, after the detection is completed, send it to the corresponding classification area of the capacitor taping device 600 according to the actual capacitance data of the capacitor, realizing full-process flexible handling.

[0057] The capacitance detection device 500 mainly includes a capacitor pin clamping mechanism 510 and an inclined measurement bracket 520 (as Figure 8 shown). The measurement bracket 520 is used to support the capacitor body, and its inclination angle helps the capacitor to automatically position after falling into the bracket and is not easy to roll off. The capacitor pin clamping mechanism 510 is arranged on both sides of the bracket and can automatically clamp the capacitor pins after the capacitor is in place, so as to conduct with the measurement circuit to complete the capacitance measurement. The whole detection process does not require manual intervention, and due to the stable clamping method, the detection error can be effectively avoided.

[0058] The capacitor after measurement will be transported to the capacitor taping device 600 by the adsorption feeding device 400 again. As Figure 10 shown, the capacitor taping device 600 includes a partitioned carrier 610 and a carrier transfer mechanism 620. The partitioned carrier 610 is provided with a plurality of partitions corresponding to different capacitance value ranges; and the carrier transfer mechanism 620 is used to drive the partitioned carrier 610 to move. The adsorption feeding device 400 automatically sends the capacitor into the corresponding predetermined partition according to the capacitance detection result, thus completing the classification and sorting of the capacitor. Each partition can also be equipped with an automatic taping structure to arrange the capacitors in the carrier tape in sequence and encapsulate them, which is convenient for subsequent automatic chip mounting and production use.

[0059] In summary, through the system structure and device layout proposed by the present invention, the whole process of capacitor stripping, detection, handling, and classification can be efficiently automated. It has the advantages of simple structure, reliable operation, high screening efficiency, and high partition accuracy. It is applicable to the field of automated detection and sorting of electronic components, and is especially suitable for the high-speed sorting and precision grading requirements of capacitor devices.

[0060] According to another aspect of the present invention, the adsorption and feeding device 400 includes: a capacitor adsorption assembly 410 and a transfer assembly 420 (as Figure 9 shown), the capacitor adsorption assembly 410 is used to adsorb the capacitors peeled off from the tape, and the transfer assembly 420 is used to drive the capacitor adsorption assembly 410 to move above the capacitance detection device 500.

[0061] Furthermore, the capacitor adsorption assembly 410 includes a lifting drive member, a lifting guide rail, a vacuum pump, and a suction nozzle (not labeled). The vacuum pump is used to create a negative pressure at the suction nozzle to adsorb the capacitor, and the lifting drive member and the lifting guide rail are used to control the lifting of the vacuum pump and the suction nozzle.

[0062] The present invention also provides a capacitor screening method, which includes the following steps:

[0063] The capacitor stripping device strips the capacitors to be detected from the tape through the rotation drive assembly, the tape clamping mechanism, and the capacitor stripping mechanism, as described above in detail and will not be elaborated here;

[0064] The adsorption and feeding device adsorbs the stripped capacitors to be detected and transfers them to the capacitance detection device for feeding, as described above in detail and will not be elaborated here;

[0065] The capacitance detection device clamps and fixes the pins of the capacitors to be detected on the measurement bracket through the capacitor pin clamping mechanism, and performs capacitance value detection, as described above in detail and will not be elaborated here;

[0066] The adsorption and feeding device adsorbs the capacitors with the capacitance value detected and transfers them to the predetermined partition of the capacitor taping device according to the detected capacitance value, as described above in detail and will not be elaborated here.

[0067] It should be noted that the above embodiments illustrate the present invention rather than limit the present invention, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in the claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention can be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In a unit claim listing several devices, several of these devices may be embodied by the same item of hardware. The use of the words first, second, and third, etc. does not denote any order. These words may be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. A capacitance screening system, characterized in that, Comprising: A capacitor stripping device and an adsorption feeding device. The capacitor stripping device includes a rotary drive assembly, a carrier tape clamping mechanism, and a capacitor stripping mechanism. The carrier tape clamping mechanism includes a driving wheel and a driven wheel. The rotary drive assembly is used to drive the driving wheel to rotate, and the driven wheel is attached to the driving wheel to clamp the carrier tape. The capacitor stripping mechanism includes a capacitor stopper, and the capacitor stopper is used to block the capacitor to separate the capacitor from the carrier tape. The adsorption feeding device is used to adsorb and feed the capacitors separated from the carrier tape.

2. The capacitance screening system according to claim 1, wherein A first rotating shaft penetrates through the middle of the driven wheel. The first rotating shaft is connected to a second rotating shaft through an adapter plate, and the second rotating shaft is rotatably connected to the frame.

3. The capacitance screening system according to claim 2, wherein The second rotating shaft is higher than the first rotating shaft.

4. The capacitance screening system according to claim 2, wherein, One side of the adapter plate is connected with an elastic element, and the other end of the elastic element is connected to the frame.

5. The capacitance screening system according to claim 2, wherein There are two adapter plates, and the two adapter plates are connected together through a fixing frame.

6. The capacitance screening system according to claim 1, wherein A plurality of grooves are formed on the outer edge of the driving wheel, and the plurality of grooves are arranged at intervals.

7. The capacitance screening system according to claim 6, characterized in that The longitudinal section of the groove is in an inverted triangle shape, and the bottom side length on the side close to the capacitor stopper is greater than the bottom side length on the side away from the capacitor stopper.

8. The capacitance screening system according to claim 1, wherein The capacitance screening system further includes a capacitance detection device. The capacitance detection device includes a capacitor pin clamping mechanism and a measurement bracket. The measurement bracket is used to carry the capacitor body of the capacitor to be measured, and it is inclined. The capacitor pin clamping mechanism is used to clamp the capacitor pins from both sides after the capacitor to be measured is placed on the measurement bracket.

9. The capacitance screening system according to claim 8, wherein The capacitance screening system further includes a capacitor taping device. The capacitor taping device is used to accommodate the capacitors that have completed the measurement in different regions according to the capacitance values of the measured capacitors. The adsorption feeding device is also used to move the capacitors that have completed the measurement to the predetermined partition of the capacitor taping device according to the measured capacitance values.

10. A method for capacitance screening, characterized in that, Including the following steps: The capacitor stripping device strips the capacitors to be detected from the carrier tape through the rotary drive assembly, the carrier tape clamping mechanism, and the capacitor stripping mechanism. The adsorption feeding device adsorbs the stripped capacitors to be detected and transfers them to the capacitance detection device. The capacitance detection device clamps and fixes the pins of the capacitors to be detected on the measurement bracket through the capacitor pin clamping mechanism, and performs capacitance value detection. The adsorption feeding device adsorbs the capacitors that have completed the capacitance value detection according to the detected capacitance values and transfers them to the predetermined partition of the capacitor taping device.

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