A vision-based e-jettable dispensing head-to-needle device

Abstract

The utility model discloses a kind of visual-based electric injection printing point glue head to needle device, the device includes big board, Z-axis double guide rail pair is equipped in big board front side, further include upper CCD module, XYZ axis driving mechanism, lifting plate, point glue module, box type annular electrode field module, lower CCD module.Upper CCD module is installed in big board front side, XYZ axis driving mechanism is installed in big board, lifting plate is fixed on the slider of double guide rail pair and is driven to do lifting motion by XYZ axis driving mechanism, point glue module is fixed on lifting plate by fine adjustment module, box type annular electrode field module is fixed in the support assembly of point glue module and acts on the needle of point glue module, lower CCD module is equipped below point glue module and is installed in vertical support by manual sliding table, lower CCD module has high-brightness light source.The device uses double-CCD visual architecture, breaks through box shielding in combination with coordinate mapping algorithm, and is matched with coarse adjustment and fine adjustment driving structure to realize micron-level needle precision.

Description

Technical Field

[0001] This utility model relates to the field of LCD and OLED screen processing technology, specifically to a vision-based electro-inking dispensing head needle alignment device. Background Technology

[0002] In the EHD precision dispensing process for LCD and OLED screens, the dispensing needle needs to be placed within a ring-shaped electrode field (sealed enclosure) to create a stable electro-inking environment. Traditional dispensing needle alignment methods have the following core problems: 1. Visual obstruction problem: The sealed enclosure obstructs the dispensing needle, making it impossible to calibrate the needle position through direct observation or a single vision component; 2. Insufficient accuracy: When relying on manual teaching or mechanical positioning, environmental vibration and assembly errors will significantly reduce calibration accuracy, making it difficult to meet the requirements of high-precision dispensing. 3. Poor adaptability: For the calibration of irregular dispensing trajectories, traditional methods are complicated and time-consuming, and cannot be adapted to the flexible production of multiple screen models.

[0003] In existing technologies, some solutions attempt to indirectly locate the pins using external sensors, but due to limitations such as insufficient light source intensity and image noise interference, the calibration accuracy still cannot meet process requirements. Therefore, there is an urgent need for a pin alignment device that can overcome the obstruction of the housing, improve calibration accuracy, and adapt to flexible production. Utility Model Content

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a vision-based electro-inking dispensing head needle alignment device.

[0005] To solve the above-mentioned technical problems, this utility model achieves the following solution: A vision-based electro-inking dispensing head alignment device of this utility model includes a large plate, on the front side of which a double guide rail pair arranged along the Z-axis is mounted. The electro-inking dispensing head alignment device also includes: The upper CCD module is installed on the front side of the large plate; XYZ axis drive mechanism mounted on the large plate; A lifting plate is fixed on the slider of the double guide rail pair. The XYZ axis drive mechanism drives the lifting plate to move up and down after being driven by the XYZ axis drive mechanism. The dispensing module is connected to the fine-tuning module via a bracket assembly, and the fine-tuning module is fixed to the lifting plate; A box-type annular electrode field module is fixed to the bracket assembly, and the box-type annular electrode field module acts on the needle of the dispensing module; The lower CCD module is located below the dispensing module and is mounted on a vertical bracket via a manual slide.

[0006] Furthermore, the lower CCD module has a high-brightness light source.

[0007] Furthermore, the dispensing module includes an electro-inking dispensing nozzle, which includes a glue cartridge for storing glue, a support assembly for fixing the glue cartridge, and a needle. The needle and the glue cartridge are connected by a connector. The internal flow channel of the needle is provided with a needle-shaped electrode; The electro-inking dispensing nozzle also includes a locking assembly, one end of which is connected to the bracket assembly, and the other end of which can lock the needle. The bracket assembly is equipped with a sensor for detecting low liquid level in the glue cartridge.

[0008] Furthermore, the box-type annular electrode field module includes: A cavity located at the lower end of the locking assembly; A connecting plate is fixed to the opening of the cavity. The upper surface of the connecting plate has a groove with a through hole, and the dispensing port of the needle points to the through hole. An electrode ring is located at the lower end of the connecting plate.

[0009] Furthermore, the electro-inking dispensing nozzle also includes a connector fixing member, one end of which is connected to the bracket assembly, and the other end of which fixes the connector.

[0010] Furthermore, the connector is a Luer connector.

[0011] Furthermore, the surface of the electrode is plated with an insulating layer.

[0012] Furthermore, the electrode is located on the central axis of the internal flow channel of the needle.

[0013] Furthermore, the surface of the needle is coated.

[0014] Furthermore, the coating includes one of a hydrophobic layer and a non-stick layer, and the coating at least covers the tip region of the needle.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. The present invention provides a needle alignment device for electro-inking dispensing heads that solves the problem of visual obstruction: through a dual vision architecture of "upper CCD module (trajectory acquisition) + lower CCD module (needle positioning)", and with the high-brightness light source of the lower CCD module, the needle can be calibrated without obstruction by penetrating the box-type ring electrode field.

[0016] 2. The needle alignment device of this utility model for electro-inking dispensing head improves needle alignment accuracy: the combination of XYZ axis drive mechanism (coarse adjustment) + fine adjustment module (fine adjustment) combined with dual CCD coordinate mapping algorithm (affine transformation) results in high needle alignment accuracy and avoids the influence of environmental vibration and assembly error.

[0017] 3. This utility model of electro-inking dispensing head needle alignment device is adapted to flexible production: it supports multiple needle models (quickly replaceable via Luer connectors) and multiple screen specifications. For irregular trajectory calibration, only the coordinate mapping parameters need to be updated, thus shortening the operation time. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the needle-aligning device for the electro-inking dispensing head of this utility model; Figure 2 This is an installation structure diagram of the dispensing module and the lower CCD module of this utility model; Figure 3 This is a structural diagram showing the connection between the electro-ink printing dispensing nozzle of this utility model and the power supply and dispensing controller. Figure 4 This is a structural diagram of the electro-ink printing dispensing nozzle of this utility model; Figure 5 This is another structural view of the electro-ink printing and dispensing nozzle of this utility model; Figure 6 for Figure 5 Enlarged view of the lower area; Figure 7 for Figure 6 Enlarged view of the lower area; Figure 8 This is a partial structural diagram of the needle of this utility model; Figure 9 This is a schematic diagram of the electrical control principle of the electro-inking dispensing nozzle of this utility model.

[0019] The attached diagram is labeled as follows: 1. Glue tube; 2. Glue tube fixing bracket; 3. Side connecting block; 4. Sensor; 5. Connector fixing component; 6. Connector; 7. Locking assembly; 8. Electrode ring fixing component; 9. Needle; 10. Connecting plate; 11. Electrode ring; 12. Groove surface; 13. Through hole; 14. Electrode; 15. Glue; 20. Lower CCD module; 30. Box-type annular electrode field module; 40. Dispensing module; 50. Manual slide table; 60. XYZ axis drive mechanism; 70. Lifting plate; 80. Upper CCD module; 90. Large plate; 100. Dual guide rail pair; 101. Glue dispensing controller; 102. Electro-inkjet dispensing nozzle; 103. Power supply. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model. Obviously, the embodiments described in this utility model are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] Example 1: The specific structure of this utility model is as follows: Please refer to the appendix. Figure 1-9 This utility model discloses a vision-based electro-inking dispensing head alignment device, comprising a large plate 90, wherein a Z-axis-aligned double guide rail pair 100 is mounted on the front side of the large plate 90, and the electro-inking dispensing head alignment device further includes: The upper CCD module 80 is installed on the front side of the large plate 90; XYZ axis drive mechanism 60 is installed on the large plate 90; The lifting plate 70 is fixed on the slider of the double guide rail pair 100. The XYZ axis drive mechanism 60 drives the lifting plate 70, and the lifting plate 70 moves up and down after being driven by the XYZ axis drive mechanism 60. The dispensing module 40 is connected to the fine-tuning module via a bracket assembly, and the fine-tuning module is fixed to the lifting plate 70. A box-type annular electrode field module 30 is fixed to the bracket assembly, and the box-type annular electrode field module 30 acts on the needle 9 of the dispensing module 40. The lower CCD module 20 is located below the dispensing module 40, and the lower CCD module 20 is mounted on a vertical bracket via a manual slide 50.

[0023] The lower CCD module 20 has a high-brightness light source. Example 2:

[0024] The following is the structure of the dispensing module 40 of this utility model: Please refer to the appendix. Figure 3-9 The dispensing module 40 of this utility model includes an electro-inking dispensing nozzle, which is connected to a dispensing controller 101 via a pipeline, and its needle head is connected to a power supply 103 to form an electric field.

[0025] The electro-inking dispensing nozzle 102 includes a glue cartridge 1 for storing glue, a support assembly for fixing the glue cartridge 1, and a needle 9. The needle 9 and the glue cartridge 1 are connected by a connector 6. The glue cartridge 1 uses a standard 10cc / 5cc syringe in conjunction with a dispensing controller for glue supply.

[0026] The electro-inking dispensing nozzle also includes a connector fixing member 5, one end of which is connected to the bracket assembly, and the other end of which fixes the connector 6. The connector 6 is a Luer connector, which is a standardized micro-volume leak-free connector.

[0027] The support assembly includes a rubber tube fixing bracket 2 and a side connecting block 3. The rubber tube fixing bracket 2 has an inner circle and an outer square shape, and it is fitted around the rubber tube 1. The upper end of the side connecting block 3 is fixed to the side end of the rubber tube fixing bracket 2 by screws, and its lower end extends downward to the parallel side of the needle 9.

[0028] The connector fastener 5 is sleeved on the outside of the connector 6, and its other end is fixed to the extension of the rubber tube fixing bracket 2.

[0029] The needle tip 9 has a needle-shaped electrode 14 arranged in its internal flow channel; the inner diameter of the flow channel is 0.5μm-500μm; the electrode 14 is located on the central axis of the internal flow channel of the needle tip 9. The surface of the electrode 14 is plated with an insulating layer or has no surface treatment. The electrode 14 includes one of a gold electrode, a copper electrode, and a silver electrode.

[0030] The electro-inking dispensing nozzle also includes a locking component 7, one end of which is connected to the bracket assembly, and the other end of which can lock the needle 9.

[0031] The lower end of the locking assembly 7 has a cavity, and a connecting plate 10 is fixed at the opening of the cavity. The upper surface of the connecting plate 10 has a groove 12, and the groove 12 is provided with a through hole 13. The glue outlet of the needle 9 points to the through hole 13. An electrode ring 11 is fixed to the lower end of the connecting plate 10. The electrode 14 inside the needle 9 is connected to a power source, and the electrode ring 11 can form an external secondary ring electric field. The electric field strength is controlled by voltage regulation. Under the combined action of air pressure and electric field, the glue in the flow channel inside the needle 9 forms a Taylor cone for spraying and dispensing. The sprayed droplets are corrected and straightened under the action of the secondary ring electric field, thereby accurately spraying the glue droplets onto the set dispensing area.

[0032] The surface of the needle 9 is coated. The coating includes either a hydrophobic layer or a non-stick layer. The coating at least covers the tip region of the needle 9. That is, the coating can completely cover the surface of the needle 9 or partially cover the surface of the needle 9. However, regardless of whether the coating completely or partially covers the needle 9, it must cover the tip region of the needle 9.

[0033] The support assembly is also equipped with a sensor 4 for detecting low liquid levels in the rubber cartridge, such as... Figure 3 Sensor 4 is mounted on the side of the glue cartridge fixing bracket 2 via a vertical connecting block. When the glue in the glue cartridge is insufficient and its liquid level is low, sensor 4 detects the low liquid level in the glue cartridge 1 and generates an electrical signal, which is sent to the processor. The processor processes the electrical signal and controls the alarm to open, prompting that more glue needs to be added. Example 3:

[0034] The following is the working principle of the electro-inking dispensing nozzle of this utility model: like Figures 1 to 5 As shown, the specific structure and working process of the electro-inking dispensing nozzle with multi-level electric field correction in this embodiment are as follows: After receiving the working signal from the host computer, the glue dispensing controller 101 starts operating, providing a stable and continuous air pressure to the glue storage syringe 1 to ensure that the glue can be smoothly delivered to the needle 9. After receiving the signal from the host computer, the power supply 103 outputs a stable voltage to provide power support for the generation of the electric field. Unlike traditional electric fields, this invention creates a unique converging electric field in the needle tip region through multi-level voltage output. The needle tip surface is coated with a hydrophobic or non-stick coating to effectively prevent adhesive adhesion and ensure stable and continuous droplet ejection. The positive electrode needle built into the needle tip 9 is charged through contact electrification or induction electrification. Under the combined effect of air pressure and the electric field, the adhesive inside the needle tip 9 forms a Taylor cone and is ejected as droplets. The adhesive cartridge 1 is precisely positioned by the adhesive cartridge fixing bracket 2 to ensure its stability. The adhesive cartridge 1 and the needle tip 9 are connected by a Luer connector 6. By adjusting the position of the Luer connector 6, the distance between the needle tip and the electrode ring 11 can be flexibly adjusted.

[0035] Due to differences in process requirements and adhesive properties among various products, in practical applications, it is necessary to select the appropriate needle 9 based on the specific product and adhesive type, and adjust the distance between the needle 9 and the electrode ring 11 accordingly. After height adjustment, the needle position is fixed using the locking assembly 7 and Luer fixing piece to prevent displacement during dispensing. Furthermore, since different adhesives require different voltages to form a Taylor cone, the voltage source needs to be adjusted according to the specific characteristics of the adhesive 15 during actual use. Through multiple tests, the voltage range that allows the adhesive 15 to stably form a Taylor cone and achieve precise dispensing is identified to ensure smooth dispensing operations and dispensing quality. Example 4:

[0036] A vision-based dispensing method for an electro-inkjet printing dispensing head needle alignment device, the dispensing method comprising the following steps: a) By using the lower CCD module 20 in conjunction with a high-brightness light source, images are acquired of the needle 9 inside the box-type annular electrode field module 30; b) Use the image processing module to extract the position information of the needle 9 in the coordinate system of the lower CCD module 20; c) Establish the coordinate mapping relationship between the lower CCD module 20 and the upper CCD module 80 through the correlation calculation module; d) Based on the mapping relationship and the position of the needle 9 in the lower CCD module 20, calculate the positional relationship between the needle 9 and the upper CCD module 80.

[0037] The high-brightness light source is an adjustable-brightness white ring-shaped LED light source, which is installed above the lens of the lower CCD module 20 to enhance the imaging contrast of the needle tip 9 contour. The correlation calculation module adopts a calibration algorithm based on affine transformation, and achieves coordinate alignment between the lower CCD module 20 and the upper CCD module 80 through a preset calibration plate or feature points.

[0038] The dispensing method also includes a calibration process: a) Place the calibration board within the field of view of the lower CCD module 20 and the upper CCD module 80, and acquire images of the calibration board respectively; b) Extract the feature points of the calibration plate and calculate the coordinate transformation matrix between the lower CCD module 20 and the upper CCD module 80; c) Remove the calibration plate, turn on the high-brightness light source, capture the needle image through the lower CCD module 20 and locate its coordinates; d) Apply a coordinate transformation matrix to map the needle position to the 80 coordinate system of the upper CCD module.

[0039] Implementation process: a) Use the CCD module 80 in vision software to extract the dispensing trajectory; b) Use the CCD module 20 in the vision software to obtain the needle position coordinates; c) The correlation calculation module converts the trajectory output by the upper CCD module 80 into a needle dispensing trajectory through affine transformation parameters.

[0040] In summary, this novel electro-inking dispensing head alignment device solves the problem of visual obstruction: through a dual-vision architecture of "upper CCD module (trajectory acquisition) + lower CCD module (needle positioning)," combined with the high-brightness light source of the lower CCD module, it achieves unobstructed needle calibration by penetrating the box-type annular electrode field. This novel electro-inking dispensing head alignment device improves alignment accuracy: the combination of an XYZ axis drive mechanism (coarse adjustment) and a fine adjustment module (fine adjustment), along with a dual CCD coordinate mapping algorithm (affine transformation), results in high alignment accuracy and avoids the influence of environmental vibration and assembly errors. This novel electro-inking dispensing head alignment device is suitable for flexible production: it supports multiple needle models (quickly replaceable via Luer connectors) and multiple screen specifications; irregular trajectory calibration only requires updating coordinate mapping parameters, reducing operation time.

[0041] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A vision-based electro-inkjet printing dispensing head alignment device, comprising a large plate (90), wherein a Z-axis aligned double guide rail pair (100) is mounted on the front side of the large plate (90), characterized in that, The electro-ink dispensing head needle alignment device also includes: The upper CCD module (80) is installed on the front side of the large plate (90). XYZ axis drive mechanism (60) mounted on the large plate (90); A lifting plate (70) is fixed on the slider of the double guide rail pair (100). The XYZ axis drive mechanism (60) drives the lifting plate (70). The lifting plate (70) moves up and down after being driven by the XYZ axis drive mechanism (60). The dispensing module (40) is connected to the fine-tuning module via a bracket assembly, and the fine-tuning module is fixed to the lifting plate (70). A box-type annular electrode field module (30) fixed to the bracket assembly, which acts on the needle (9) of the dispensing module (40). The lower CCD module (20) is located below the dispensing module (40), and the lower CCD module (20) is mounted on a vertical bracket via a manual slide (50).

2. The vision-based electro-inkjet printing dispensing head needle alignment device according to claim 1, characterized in that, The lower CCD module (20) has a high-brightness light source.

3. The vision-based electro-inkjet printing dispensing head needle alignment device according to claim 1, characterized in that, The dispensing module (40) includes an electro-spray dispensing nozzle, which includes a glue cartridge (1) for storing glue, a support assembly for fixing the glue cartridge (1), and a needle (9). The needle (9) and the glue cartridge (1) are connected by a connector (6). The internal flow channel of the needle (9) is provided with a needle-shaped electrode (14). The electro-inking dispensing nozzle also includes a locking assembly (7), one end of which is connected to the bracket assembly, and the other end of which can lock the needle (9). The bracket assembly is equipped with a sensor (4) for detecting low liquid level in the glue cartridge.

4. The vision-based electro-inkjet printing dispensing head needle alignment device according to claim 3, characterized in that, The box-type annular electrode field module (30) includes: A cavity located at the lower end of the locking assembly (7); A connecting plate (10) is fixed to the opening of the cavity. The upper surface of the connecting plate (10) has a groove (12) and a through hole (13). The glue outlet of the needle (9) points to the through hole (13). An electrode ring (11) is located at the lower end of the connecting plate (10).

5. A vision-based electro-inkjet printing dispensing head needle alignment device according to claim 3, characterized in that, The electro-inking dispensing nozzle also includes a connector fixing member (5), one end of which is connected to the bracket assembly, and the other end of which is fixed to the connector (6).

6. The vision-based electro-inkjet printing dispensing head needle alignment device according to claim 3, characterized in that, The connector (6) is a Luer connector.

7. The vision-based electro-inkjet printing dispensing head needle alignment device according to claim 3, characterized in that, The surface of the electrode (14) is coated with an insulating layer.

8. The vision-based electro-inkjet printing dispensing head needle alignment device according to claim 3, characterized in that, The electrode (14) is located on the central axis of the internal flow channel of the needle (9).

9. The vision-based electro-inkjet printing dispensing head needle alignment device according to claim 3, characterized in that, The surface of the needle (9) is coated.

10. A vision-based electro-inkjet printing dispensing head needle alignment device according to claim 9, characterized in that, The coating includes one of a hydrophobic layer and a non-stick layer, and the coating at least covers the end region of the needle (9).

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