High-precision dispensing method and dispensing device

Abstract

The application discloses a high-precision dispensing method and a dispensing device, wherein the high-precision dispensing method comprises the following steps: editing a dispensing track of a to-be-dispensed device; setting a dispensing-off mark at a position close to an end point of the dispensing track; opening a glue outlet of a dispensing head, and stopping at a starting point of the dispensing track for a preset time length; coating glue along the dispensing track by the glue outlet until the glue outlet reaches the dispensing-off mark; closing the glue outlet of the dispensing head, and continuously moving the glue outlet to an end point of the dispensing track; reversely moving the glue outlet along the dispensing track until the glue outlet stops dispensing glue. By stopping for a preset time length at the beginning of dispensing and dispensing off glue in advance at a position close to the end point of dispensing, the application makes the glue more uniform on the dispensing track, avoids glue overflow and dispensing failure, and improves the dispensing effect.

Description

Technical Field

[0001] This invention relates to the field of thermally conductive gel technology, and in particular to a high-precision dispensing method and dispensing device. Background Technology

[0002] Thermal conductive gel, as a heat transfer medium between heat sources and heat sinks, has wide applications in many technological fields such as electronics, electrical appliances, communications, and lighting. It is commonly used in dispensing operations via dispensing machines. With the rapid development of technology, people's requirements for the quality of electronic products are constantly increasing, leading to faster product updates and higher demands for assembly precision.

[0003] In existing technologies, adhesive is sprayed along the extension trajectory of the thermal conductive gel using a dispensing machine, and the dispensing is achieved by manually controlling the start and stop of the dispensing machine. However, there are delays in both the dispensing and retraction of the dispensing machine. The dispensing delay causes uneven adhesive at the beginning of the dispensing trajectory, and the retraction delay causes the thermal conductive gel to overflow at the end of the dispensing trajectory, resulting in tailing or diffusion. This leads to poor dispensing effect of the thermal conductive gel and low dispensing efficiency. Summary of the Invention

[0004] The main objective of this invention is to provide a high-precision dispensing method and dispensing device, which aims to solve the problems of poor dispensing effect and low dispensing efficiency in existing dispensing technologies.

[0005] To achieve the above objectives, the present invention provides a high-precision dispensing method, comprising the following steps:

[0006] Edit the dispensing trajectory of the device to be dispensed;

[0007] A dispensing mark is placed near the endpoint of the dispensing trajectory;

[0008] Open the dispensing nozzle of the dispensing head and pause at the starting point of the dispensing trajectory for a preset time;

[0009] The adhesive is applied along the dispensing trajectory from the dispensing port until the dispensing port reaches the adhesive shut-off mark.

[0010] Close the dispensing nozzle of the dispensing head and allow the dispensing nozzle to continue moving to the end of the dispensing trajectory;

[0011] The dispensing nozzle moves in the opposite direction along the dispensing trajectory until the dispensing nozzle stops dispensing glue.

[0012] Preferably, the device to be dispensed has multiple spaced-apart areas for dispensing, and the areas for dispensing are continuous line segments.

[0013] The steps for editing the dispensing trajectory include:

[0014] When the interval between the adjacent endpoints of any two adjacent areas to be glued is less than 0.5cm, the two adjacent areas to be glued are connected to form a glue dispensing trajectory. When there are no endpoints of other areas to be glued within 0.5cm around the endpoint of the area to be glued, a glue dispensing trajectory is formed along the extension direction of the area to be glued.

[0015] Preferably, the step of setting the adhesive-closing mark at a position near the end of the dispensing trajectory includes:

[0016] The adhesive-closing mark is set at a position X, which is a distance from the end point of the dispensing trajectory, where 0 mm. <X<1mm。

[0017] Preferably, after the step of the dispensing nozzle moving in the opposite direction along the dispensing trajectory until the dispensing nozzle stops dispensing adhesive, the method further includes:

[0018] The dispensing port moves to the starting point of the next dispensing trajectory and returns to execute the steps of opening the dispensing port and staying at the starting point of the dispensing trajectory for a preset time, until all dispensing trajectories are completed.

[0019] Preferably, the step of opening the dispensing head's outlet and pausing at the starting point of the dispensing trajectory for a preset time includes:

[0020] Open the dispensing head's outlet, spray glue at a preset flow rate, and pause at the starting point of the dispensing trajectory for 110ms to 120ms.

[0021] Preferably, the step of moving the dispensing nozzle in the opposite direction along the dispensing trajectory until the dispensing nozzle stops dispensing adhesive includes:

[0022] The dispensing nozzle moves from the end point of the dispensing trajectory to the beginning point of the dispensing trajectory, so that the residual glue layer is stacked on top of the glue on the dispensing trajectory.

[0023] Continue moving until the dispensing port stops dispensing glue.

[0024] Preferably, after the step of the dispensing nozzle moving in the opposite direction along the dispensing trajectory until the dispensing nozzle stops dispensing adhesive, the method further includes:

[0025] Move the distance sensor along the dispensing trajectory to measure the height of each point on the dispensing trajectory;

[0026] A sampling curve is generated based on the height of each point on the dispensing trajectory, and the sampling curve is filtered and fitted to obtain the final curve.

[0027] The final glue height is obtained based on the final curve. If the final glue height is not within the preset height range, the device to be glued is marked as unqualified. If the final glue height is within the preset height range, the device to be glued is marked as qualified.

[0028] The present invention also provides a dispensing device for use in the above-mentioned high-precision dispensing method, the dispensing device comprising:

[0029] The support platform is used to support the device to be dispensed with adhesive.

[0030] A dispensing head, wherein the dispensing head has a dispensing port, and the dispensing port sprays adhesive;

[0031] A drive assembly is disposed on the support platform;

[0032] The controller is electrically connected to both the dispensing head and the drive assembly. The controller is used to edit the dispensing trajectory and control the drive assembly to drive the dispensing head and the dispensing outlet to move along the dispensing trajectory.

[0033] Preferably, the dispensing head is equipped with a barcode scanner and a camera, both of which are electrically connected to the controller. The device to be dispensed has an information code, the barcode scanner is used to scan the information code to obtain the corresponding information of the device to be dispensed, and the camera is used to capture an image of the device to be dispensed and send it to the controller.

[0034] Preferably, the dispensing head is further provided with a laser rangefinder, which is located on one side of the dispensing port along the dispensing trajectory and moves along the dispensing trajectory following the dispensing port.

[0035] In the technical solution of this invention, a dispensing trajectory is edited on the device to be dispensed, so that the dispensing head can dispense adhesive according to the trajectory. Since some residual adhesive will still be discharged from the outlet after the dispensing head is closed, a closing mark is set near the end of the dispensing trajectory, so that the dispensing head is closed in advance. The remaining part of the dispensing trajectory is coated with residual adhesive. When dispensing begins, the dispensing head is held at the starting point of the dispensing trajectory for a preset time before moving, so that the adhesive at the starting point is more uniform and the missed spots are avoided. After the dispensing head moves to the end point, it moves in the opposite direction, layering the residual adhesive on top of the original adhesive on the dispensing trajectory, preventing the adhesive from overflowing to the sides and affecting other areas, thereby improving the dispensing effect. At the same time, there is no need to manually control the opening and closing of the dispensing head, which improves the dispensing efficiency. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0037] Figure 1 This is a flowchart of a high-precision dispensing method according to an embodiment of the present invention;

[0038] Figure 2 This is a flowchart of step S600 of a high-precision dispensing method according to an embodiment of the present invention;

[0039] Figure 3 This is a flowchart of the steps following step S600 in a high-precision dispensing method according to an embodiment of the present invention.

[0040] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indicator will also change accordingly.

[0043] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible to those skilled in the art. If a combination of technical solutions contradicts each other or cannot be implemented, such a combination should be considered non-existent and not within the scope of protection claimed by the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0046] This invention proposes a high-precision dispensing method.

[0047] Please see Figure 1 The high-precision dispensing method of this embodiment includes the following steps:

[0048] S100: Edit the dispensing trajectory of the device to be dispensed;

[0049] Edit the dispensing trajectory according to the designed dispensing area on the device to be dispensed. The dispensing trajectory needs to cover the dispensing area.

[0050] S200: Set a dispensing mark near the end point of the dispensing trajectory;

[0051] Determine the position of the dispensing endpoint based on the dispensing trajectory, and then determine the distance between the dispensing shut-off mark and the end point of the dispensing trajectory based on the dispensing speed at the dispensing nozzle, and set the dispensing shut-off mark accordingly;

[0052] S300: Open the dispensing head's outlet and stay at the starting point of the dispensing trajectory for a preset time;

[0053] Then, based on the dispensing speed of the dispensing nozzle, the time required for the glue to travel from the opening of the dispensing nozzle to the starting point of the dispensing trajectory is determined, thereby determining the preset time to prevent glue leakage.

[0054] S400: The adhesive outlet applies adhesive along the dispensing trajectory until the adhesive outlet reaches the adhesive shut-off mark;

[0055] The dispensing head applies glue evenly along the dispensing path, applying glue to every point on the dispensing path until the dispensing head moves to the glue-off mark.

[0056] S500: Close the dispensing head's outlet and allow the outlet to continue moving to the end of the dispensing trajectory;

[0057] Close the dispensing nozzle in advance at the dispensing mark, and use the water inside the dispensing head to dispense the remaining part of the dispensing trajectory. This is to prevent residual water from overflowing the dispensing trajectory when the dispensing nozzle is closed at the end point, which could affect the components next to the dispensing trajectory.

[0058] S600: The dispensing port moves in the opposite direction along the dispensing trajectory until the dispensing port stops dispensing glue.

[0059] Reverse the dispensing nozzle to layer some of the remaining glue on top of the glue on the dispensing path, preventing glue overflow.

[0060] In the technical solution of this invention, a dispensing trajectory is edited on the device to be dispensed, so that the dispensing head can dispense adhesive according to the trajectory. Since some residual adhesive will still be discharged from the outlet after the dispensing head is closed, a closing mark is set near the end of the dispensing trajectory, so that the dispensing head is closed in advance. The remaining part of the dispensing trajectory is coated with residual adhesive. When dispensing begins, the dispensing head is held at the starting point of the dispensing trajectory for a preset time before moving, so that the adhesive at the starting point is more uniform and the missed spots are avoided. After the dispensing head moves to the end point, it moves in the opposite direction, layering the residual adhesive on top of the original adhesive on the dispensing trajectory, preventing the adhesive from overflowing to the sides and affecting other areas, thereby improving the dispensing effect. At the same time, there is no need to manually control the opening and closing of the dispensing head, which improves the dispensing efficiency.

[0061] In one embodiment, the device to be dispensed has a plurality of spaced-apart areas for dispensing adhesive, wherein the areas for dispensing adhesive are continuous line segments.

[0062] Step S100 includes:

[0063] S110: When the interval between the adjacent endpoints of any two adjacent areas to be glued is less than 0.5cm, the two adjacent areas to be glued are connected to form a glue dispensing trajectory. When there are no endpoints of other areas to be glued within 0.5cm around the endpoint of the area to be glued, a glue dispensing trajectory is formed along the extension direction of the area to be glued.

[0064] When there are multiple spaced dispensing areas on the device to be dispensed, the distance between the adjacent endpoints of any two adjacent dispensing areas is used to determine whether they can be dispensed continuously. When the distance between the adjacent endpoints of any two adjacent dispensing areas is less than 0.5cm, their ends are connected so that the two dispensing areas form a dispensing trajectory, reducing the repeated dispensing process and improving dispensing efficiency.

[0065] In one embodiment, step S200 includes:

[0066] S210: Set the adhesive-closing mark at a position X away from the endpoint of the dispensing trajectory, where 0mm <X<1mm。

[0067] The position of the glue-off mark is determined based on the glue dispensing speed at the glue outlet, and is generally no more than 1mm, to prevent insufficient glue from filling the remaining part of the glue dispensing trajectory.

[0068] Furthermore, step S600 includes the following:

[0069] S700: The dispensing port moves to the starting point of the next dispensing trajectory and returns to step S300 until all dispensing trajectories are completed.

[0070] When there are multiple areas to be dispensed on the device, it is divided into multiple dispensing tracks according to step S110. Therefore, after dispensing on one dispensing track is completed, the dispensing head needs to be raised and moved to the starting point of the next dispensing track, and then the process returns to step S300 until all dispensing tracks are completed.

[0071] Specifically, step S300 includes:

[0072] S310: Open the dispensing head's outlet, spray glue at a preset flow rate, and pause at the starting point of the dispensing trajectory for 110ms to 120ms.

[0073] The preset duration is calculated based on the preset flow rate, and is usually within 110ms to 120ms. Within this time, the glue can be sprayed from the nozzle and come into contact with the dispensing trajectory, thereby improving the dispensing rate of the dispensing trajectory and avoiding missed spots.

[0074] Please see Figure 2 In one embodiment, step S600 includes:

[0075] S610: The dispensing port moves from the end point of the dispensing trajectory to the starting point of the dispensing trajectory along the dispensing trajectory, so that the residual glue is layered on top of the glue on the dispensing trajectory.

[0076] S620: Continue moving until the dispensing port stops dispensing glue.

[0077] By moving the dispensing nozzle from the end point of the dispensing trajectory towards the beginning point along the dispensing trajectory, residual glue will be layered on top of the glue at the end point of the dispensing trajectory, preventing glue from overflowing to both sides of the dispensing trajectory and improving the dispensing effect.

[0078] Please see Figure 3In one embodiment, step S600 is followed by:

[0079] S810: Move the distance sensor along the dispensing trajectory to measure the height of each point on the dispensing trajectory;

[0080] S820: Generate a sampling curve based on the height of each point on the dispensing trajectory, and filter and fit the sampling curve to obtain the final curve;

[0081] S830: Obtain the final glue height based on the final curve. If the final glue height is not within the preset height range, mark the device to be glued as unqualified. If the final glue height is within the preset height range, mark the device to be glued as qualified.

[0082] Specifically, the distance sensor is a laser rangefinder with a sampling frequency exceeding 1000 Hz, which improves the detection accuracy of the glue surface height. After the distance sensor moves along the dispensing trajectory to complete the detection, a sampling curve is plotted based on the data obtained by the distance sensor, with the distance as the Y-axis and the position of the dispensing trajectory as the X-axis. Then, the curve is filtered and fitted using the OpenCV algorithm library to obtain the final curve. The highest point of the final curve is the final glue height. When the final glue height is within the preset range, it means that the dispensing effect of the product is good, meeting the functional requirements without affecting other components, so it is marked as qualified. Otherwise, it is marked as unqualified and discarded or re-dispensed.

[0083] This invention also provides a dispensing device applied to the aforementioned high-precision dispensing method. The dispensing device includes a support platform, a dispensing head, a drive assembly, and a controller. The support platform supports the device to be dispensed; the dispensing head has an outlet for spraying adhesive; the drive assembly is mounted on the support platform; both the dispensing head and the drive assembly are electrically connected to the controller. The controller is used to edit the dispensing trajectory and control the drive assembly to move the dispensing head and outlet along the dispensing trajectory. The controller controls the drive assembly to move the dispensing head to locate the device to be dispensed on the support platform. Then, the controller controls the dispensing head to move along the dispensing trajectory, while simultaneously controlling the opening and closing of the dispensing head, thereby achieving the aforementioned high-precision dispensing method and improving the dispensing effect. Furthermore, by controlling the movement, opening, and closing of the dispensing head, the dispensing efficiency is improved.

[0084] Specifically, the dispensing head is equipped with a barcode scanner and a camera, both of which are electrically connected to the controller. The device to be dispensed has an information code. The barcode scanner is used to scan the information code to obtain the information of the corresponding device to be dispensed, and the camera is used to take an image of the device to be dispensed and send it to the controller.

[0085] An information code is set on the device to be dispensed. The barcode scanner obtains the information of the corresponding device by scanning the information code, thereby obtaining the position of the area to be dispensed on the device. This eliminates the need for manual positioning each time, improving dispensing efficiency. The camera provides real-time feedback of the image of the area to be dispensed, improving positioning accuracy and dispensing accuracy.

[0086] In one embodiment, a laser rangefinder is also provided on the dispensing head. The laser rangefinder is positioned on one side of the dispensing nozzle along the dispensing trajectory and moves along the dispensing trajectory with the nozzle. The laser rangefinder moves with the dispensing nozzle and follows behind it. After the previous dispensing nozzle completes dispensing, the subsequent laser rangefinder can promptly measure the glue height without needing to move the laser rangefinder along the dispensing trajectory again after dispensing is complete, thus improving dispensing efficiency.

[0087] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A high-precision dispensing method, characterized in that, The process for applying a thermally conductive gel between a heat source and a radiator includes the following steps: Edit the dispensing trajectory of the device to be dispensed; A dispensing mark is placed near the endpoint of the dispensing trajectory; Open the dispensing nozzle of the dispensing head and pause at the starting point of the dispensing trajectory for a preset time; The adhesive is applied along the dispensing trajectory from the dispensing port until the dispensing port reaches the adhesive shut-off mark. Close the dispensing nozzle of the dispensing head and allow the dispensing nozzle to continue moving to the end of the dispensing trajectory; The dispensing port moves in the opposite direction along the dispensing trajectory until the dispensing port stops dispensing glue. The device to be dispensed has multiple spaced-apart areas for dispensing adhesive, and the areas for dispensing adhesive are continuous line segments. The steps for editing the dispensing trajectory include: When the interval between the adjacent endpoints of any two adjacent areas to be glued is less than 0.5cm, the two adjacent areas to be glued are connected to form a glue dispensing trajectory. When there are no endpoints of other areas to be glued within 0.5cm around the endpoint of the area to be glued, a glue dispensing trajectory is formed along the extension direction of the area to be glued. After the step of moving the dispensing nozzle in the opposite direction along the dispensing trajectory until the dispensing nozzle stops dispensing glue, the method further includes: The dispensing port moves to the starting point of the next dispensing trajectory and returns to execute the steps of opening the dispensing port and staying at the starting point of the dispensing trajectory for a preset time, until all dispensing trajectories are completed.

2. The high-precision dispensing method as described in claim 1, characterized in that, The step of setting the adhesive cut-off mark at a position near the end of the dispensing trajectory includes: The adhesive-closing mark is set at a position X, which is a distance from the end point of the dispensing trajectory, where 0 mm. <X<1mm。 3. The high-precision dispensing method as described in claim 1, characterized in that, The step of opening the dispensing head's outlet and pausing at the starting point of the dispensing trajectory for a preset time includes: Open the dispensing head's outlet, spray glue at a preset flow rate, and pause at the starting point of the dispensing trajectory for 110ms~120ms.

4. The high-precision dispensing method according to any one of claims 1-3, characterized in that, The step of moving the dispensing nozzle in the opposite direction along the dispensing trajectory until the dispensing nozzle stops dispensing adhesive includes: The dispensing nozzle moves from the end point of the dispensing trajectory to the beginning point of the dispensing trajectory, so that the residual glue layer is stacked on top of the glue on the dispensing trajectory. Continue moving until the dispensing port stops dispensing glue.

5. The high-precision dispensing method according to any one of claims 1-3, characterized in that, After the step of moving the dispensing nozzle in the opposite direction along the dispensing trajectory until the dispensing nozzle stops dispensing glue, the method further includes: Move the distance sensor along the dispensing trajectory to measure the height of each point on the dispensing trajectory; A sampling curve is generated based on the height of each point on the dispensing trajectory, and the sampling curve is filtered and fitted to obtain the final curve. The final glue height is obtained based on the final curve. If the final glue height is not within the preset height range, the device to be glued is marked as unqualified. If the final glue height is within the preset height range, the device to be glued is marked as qualified.

6. A dispensing apparatus, used in the high-precision dispensing method as described in any one of claims 1-5, characterized in that, The dispensing device includes: A support platform, used to support the device to be dispensed with adhesive; A dispensing head, wherein the dispensing head has a dispensing port, and the dispensing port sprays adhesive; A drive assembly is disposed on the support platform; The controller is electrically connected to both the dispensing head and the drive assembly. The controller is used to edit the dispensing trajectory and control the drive assembly to drive the dispensing head and the dispensing outlet to move along the dispensing trajectory.

7. The dispensing device as described in claim 6, characterized in that, The dispensing head is equipped with a barcode scanner and a camera, both of which are electrically connected to the controller. The device to be dispensed has an information code. The barcode scanner is used to scan the information code to obtain the corresponding information of the device to be dispensed, and the camera is used to capture an image of the device to be dispensed and send it to the controller.

8. The dispensing device as described in claim 7, characterized in that, The dispensing head is also equipped with a laser rangefinder, which is located on one side of the dispensing port along the dispensing trajectory and moves along the dispensing trajectory following the dispensing port.

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