Work needle deformation detection method

Abstract

The application discloses a kind of job needle head deformation detection methods, comprising: S1, the y direction position of needle head is demarcated before needle head works by x direction optical fiber, determine y direction signal trigger position;S2, the x direction position of needle head is demarcated before needle head works by y direction optical fiber, determine x direction signal trigger position;S3, when needing detection in the process of needle head work, needle head is moved to x direction signal trigger position and y direction signal trigger position, if the optical fiber signal of any position in x direction signal trigger position and y direction signal trigger position is not triggered, needle head needs to be replaced, otherwise needle head can continue to use.The application judges whether needle head is deformed by whether optical fiber is triggered, whole detection process is fast and stable, and detection result is direct and accurate.

Description

Technical Field

[0001] This invention belongs to the field of detection technology, specifically relating to a method for detecting the deformation of a working needle. Background Technology

[0002] In electronics manufacturing, high precision is often required, making the use of needles a common application. Needles are used for dispensing, applying adhesive, cutting solder paste, as well as for adsorption and mounting. However, if the needle deforms during use, it can severely impact product quality. Common manufacturer methods for inspection include: 1. Directly assessing the needle's condition using a microscope; however, this method requires meticulous observation and is quite tedious. 2. Indirectly assessing the condition by comparing the quality of each product or the amount of adhesive dispensed each time through system calibration; however, this method is easily affected by other parameters and cannot directly determine the needle's condition. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0004] Therefore, this invention proposes a method for detecting the deformation of working needles. This method has the advantages of directly detecting the deformation state of the needles, and the detection process is simple and the monitoring efficiency is high.

[0005] The method for detecting needle deformation according to an embodiment of the present invention includes: S1, calibrating the y-direction position of the needle before it is put into operation using an x-direction optical fiber to determine the y-direction signal trigger position; S2, calibrating the x-direction position of the needle before it is put into operation using a y-direction optical fiber to determine the x-direction signal trigger position; S3, when detection is required during needle operation, moving the needle to both the x-direction signal trigger position and the y-direction signal trigger position. If the optical fiber signal at either the x-direction signal trigger position or the y-direction signal trigger position is not triggered, the needle needs to be replaced; otherwise, the needle can continue to be used.

[0006] According to one embodiment of the present invention, the x-direction optical fiber is parallel to the x-axis, the y-direction optical fiber is parallel to the y-axis, and the x-direction optical fiber and the y-direction optical fiber are at the same horizontal height.

[0007] According to an embodiment of the present invention, step S1 specifically includes: S11, determining the detection range; S12, moving the newly installed needle into the detection range; S13, adjusting the needle height so that the lower end of the needle is lower than the x-direction optical fiber; S14, adjusting the needle position to trigger the x-direction optical fiber to find the y-direction signal trigger position at the lower end of the needle.

[0008] According to an embodiment of the present invention, step S14 specifically includes: S141, the needle moves back and forth along the y direction until it triggers the x-direction optical fiber and then stops; S142, the needle moves upward until the signal of the x-direction optical fiber disappears, and then moves back and forth along the y direction. If the x-direction optical fiber is triggered again, this step is repeated until the needle can no longer trigger the x-direction optical fiber when moving back and forth along the y direction; S143, if the needle moves downward and triggers the x-direction optical fiber, it is recorded as the y-direction signal trigger position. If the x-direction optical fiber is not triggered, the needle moves back and forth along the y direction until the x-direction optical fiber is triggered and then recorded as the y-direction signal trigger position.

[0009] According to an embodiment of the present invention, step S2 specifically includes: S21, determining the detection range; S22, moving the newly installed needle into the detection range; S23, adjusting the needle height so that the lower end of the needle is lower than the y-direction optical fiber; S24, adjusting the needle position to trigger the y-direction optical fiber to find the x-direction signal trigger position at the lower end of the needle.

[0010] According to an embodiment of the present invention, step S24 specifically includes: S241, the needle moves back and forth along the x-direction until it triggers the y-direction optical fiber and then stops; S242, the needle moves upward until the signal of the y-direction optical fiber disappears, and then moves back and forth along the x-direction. If the y-direction optical fiber is triggered again, this step is repeated until the needle can no longer trigger the y-direction optical fiber when moving back and forth along the x-direction; S243, if the needle moves downward and triggers the y-direction optical fiber, it is recorded as the x-direction signal trigger position. If the y-direction optical fiber is not triggered, the needle moves back and forth along the x-direction until the y-direction optical fiber is triggered and then recorded as the x-direction signal trigger position.

[0011] According to one embodiment of the present invention, step S3 specifically includes: first moving the needle to the x-direction signal trigger position; if the y-direction fiber is triggered, then moving to the y-direction signal trigger position; if the x-direction fiber is triggered, then the needle can continue to be used; or first moving the needle to the y-direction signal trigger position; if the x-direction fiber is triggered, then moving to the x-direction signal trigger position; if the y-direction fiber is triggered, then the needle can continue to be used.

[0012] According to one embodiment of the present invention, if the corresponding optical fiber signal is not triggered when the needle is at the x-axis signal trigger position or the y-axis signal trigger position, the position of the needle is adjusted within the threshold range. If the corresponding optical fiber is still not triggered, the needle needs to be replaced.

[0013] According to one embodiment of the present invention, when the needle does not trigger the corresponding optical fiber signal at the x-direction signal triggering position, the position of the needle is adjusted along the x and z directions within a threshold range; when the needle does not trigger the corresponding optical fiber signal at the y-direction signal triggering position, the position of the needle is adjusted along the y and z directions within a threshold range.

[0014] According to one embodiment of the present invention, let the detection length of the x-direction optical fiber be X and the detection length of the y-direction optical fiber be Y, then the detection range is a rectangular area with a length of X and a width of Y. When searching for the y-direction signal trigger position or the x-direction signal trigger position at the lower end of the needle, the needle remains within the rectangular area.

[0015] The beneficial effects of this invention are that it uses optical fibers to calibrate the needle in the x and y directions before operation to obtain the x-direction signal trigger position and the y-direction signal trigger position. When the needle needs to be tested after a certain period of use, the needle is moved back to the x-direction signal trigger position and the y-direction signal trigger position. Whether the optical fiber is triggered is used to determine whether the needle is deformed and whether it can continue to be used. The whole testing process is fast and stable, and the test results are direct and accurate.

[0016] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, wherein:

[0019] Figure 1 This is a flowchart illustrating the needle deformation detection method of the present invention;

[0020] Figure 2 This is a flowchart illustrating step S1 in the needle deformation detection method of the present invention.

[0021] Figure 3 This is a flowchart illustrating step S2 in the needle deformation detection method of the present invention;

[0022] Figure 4 This is a flowchart illustrating step S3 in the needle deformation detection method of the present invention.

[0023] Figure 5 This is a schematic diagram of the needle of the present invention during the detection process;

[0024] Figure 6 This is a schematic diagram of the needle of the present invention and the trigger points of the x-axis fiber and y-axis fiber during calibration. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] The method for detecting the deformation of the working needle according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] like Figures 1-6 As shown, the method for detecting needle deformation according to an embodiment of the present invention includes: S1, calibrating the y-direction position of the needle before it starts working using the x-direction optical fiber 1 to determine the y-direction signal trigger position; S2, calibrating the x-direction position of the needle before it starts working using the y-direction optical fiber 2 to determine the x-direction signal trigger position; S3, when detection is required during needle operation, moving the needle to both the x-direction and y-direction signal trigger positions. If the optical fiber signal at either the x-direction or y-direction signal trigger position is not triggered, it indicates that the needle deformation exceeds a threshold, and the needle needs to be replaced; otherwise, the needle can continue to be used.

[0030] In other words, this invention utilizes optical fibers to calibrate the needle in the x and y directions before operation, obtaining the x- and y-axis signal trigger positions. Both the x- and y-axis trigger positions are three-dimensional coordinates. When the needle needs to be tested after a certain period of use, the needle drive mechanism moves the needle back to the x- and y-axis signal trigger positions. Compared to traditional methods that rely on direct observation with a microscope or indirect determination by measuring the amount of adhesive applied, this invention determines needle deformation by whether the optical fiber is triggered. The entire testing process is fast and stable, and the test results are direct and accurate.

[0031] In this configuration, fiber 1 in the x-direction is parallel to the x-axis, and fiber 2 in the y-direction is parallel to the y-axis. Fiber 1 and fiber 2 in the x-direction are at the same horizontal height. Let the detection length of fiber 1 in the x-direction be X, and the detection length of fiber 2 in the y-direction be Y. The detection range is a rectangular area with length X and width Y. When searching for the y-direction signal trigger position or the x-direction signal trigger position at the lower end of the needle, the needle remains within this rectangular area.

[0032] Specifically, step S1 includes: S11, determining the detection range; S12, moving the newly installed needle into the detection range; S13, adjusting the needle height so that the lower end of the needle is lower than the x-direction fiber 1; S14, adjusting the needle position to trigger the x-direction fiber 1 to find the y-direction signal trigger position at the lower end of the needle.

[0033] Further, step S14 specifically includes: S141, the needle moves back and forth along the y-direction until it triggers the x-direction fiber 1 and then stops, at which point a first trigger point 11 is formed on the x-direction fiber 1; S142, the needle moves upward until the signal of the x-direction fiber 1 disappears, and then moves back and forth along the y-direction. If the x-direction fiber 1 is triggered again, this step is repeated until the needle can no longer trigger the x-direction fiber 1 when moving back and forth along the y-direction; S143, if the needle moves downward and triggers the x-direction fiber 1, it is recorded as the y-direction signal trigger position. If the x-direction fiber 1 is not triggered, the needle moves back and forth along the y-direction until it triggers the x-direction fiber 1 and is recorded as the y-direction signal trigger position. The y-direction signal trigger position is the position when the needle last triggers the x-direction fiber 1 in S142, and also the position when the needle triggers the x-direction fiber 1 again in S143. That is to say, the y-direction signal trigger position is actually the motion coordinates (x1, y1, z1) of the needle drive mechanism when the lower end of the needle falls on the first trigger point 11.

[0034] The detection range is a rectangular area with length X and width Y. The main method to find the y-direction signal trigger position at the lower end of the needle is as follows: the needle driving mechanism moves the needle into the detection range, so that the lower end of the needle is lower than the plane of the rectangular area. First, the needle is driven to move along the y direction to trigger the x-direction fiber 1. Then, the height of the needle is raised, and it moves along the y direction again. This process is repeated until the position where the lower end of the needle triggers the x-direction fiber 1 is found. Then, the height of the needle is lowered, and it moves along the y direction again. This process is repeated until the lower end of the needle triggers the x-direction fiber 1 again. This confirms the position of the needle driving mechanism when the lower end of the needle triggers the x-direction fiber 1. Then, the needle driving mechanism only needs to continue moving to (x1, y1, z1), which is the y-direction signal trigger position. If the needle is not deformed, the lower end of the needle will definitely fall on the first trigger point 11.

[0035] Specifically, step S2 includes: S21, determining the detection range; S22, moving the newly installed needle into the detection range; S23, adjusting the needle height so that the lower end of the needle is lower than the y-direction fiber 2; S24, adjusting the needle position to trigger the y-direction fiber 2 to find the x-direction signal trigger position at the lower end of the needle.

[0036] Further, step S24 specifically includes: S241, the needle moves back and forth along the x-direction until it triggers the y-direction fiber 2 and then stops, at which point a second trigger point 21 is formed on the y-direction fiber 2; S242, the needle moves upward until the signal of the y-direction fiber 2 disappears, and then moves back and forth along the x-direction. If the y-direction fiber 2 is triggered again, this step is repeated until the needle can no longer trigger the y-direction fiber 2 when moving back and forth along the x-direction; S243, if the needle moves downward and triggers the y-direction fiber 2, it is recorded as the x-direction signal trigger position. If the y-direction fiber 2 is not triggered, the needle moves back and forth along the x-direction until it triggers the y-direction fiber 2 and is recorded as the x-direction signal trigger position. The x-direction signal trigger position is the position when the needle last triggers the y-direction fiber 2 in S242, and also the position when the needle triggers the y-direction fiber 2 again in S243. That is to say, the x-direction signal trigger position is actually the motion coordinates (x2, y2, z2) of the needle drive mechanism when the lower end of the needle falls on the second trigger point 21.

[0037] The detection range is a rectangular area with length X and width Y. The main method to find the x-direction signal trigger position at the lower end of the needle is as follows: the needle driving mechanism moves the needle into the detection range, so that the lower end of the needle is lower than the plane of the rectangular area. The needle is first driven to move along the x-direction to trigger the y-direction fiber 2. Then the height of the needle is increased, and it moves along the x-direction again. This process is repeated until the position where the lower end of the needle triggers the y-direction fiber 2 is found. Then the height of the needle is decreased, and it moves along the x-direction again. This process is repeated until the lower end of the needle triggers the y-direction fiber 2 again. This confirms the position of the needle driving mechanism when the lower end of the needle triggers the y-direction fiber 2. Then the needle driving mechanism only needs to continue moving to (x2, y2, z2), which is the x-direction signal trigger position. If the needle is not deformed, the lower end of the needle will definitely fall on the first trigger point 11.

[0038] Preferably, step S3 specifically includes: first moving the needle to the x-direction signal trigger position; if the y-direction fiber 2 is triggered, then moving it to the y-direction signal trigger position; if the x-direction fiber 1 is triggered, then the needle can continue to be used; or first moving the needle to the y-direction signal trigger position; if the x-direction fiber 1 is triggered, then moving it to the x-direction signal trigger position; if the y-direction fiber 2 is triggered, then it is determined that the needle deformation state is normal and no replacement is required.

[0039] In other words, when the needle drive mechanism is in the x-axis signal trigger position and the y-axis signal trigger position, only when the corresponding x-axis fiber 1 and y-axis fiber 2 are both triggered can it be determined that the needle deformation state is normal and no replacement is needed.

[0040] According to one embodiment of the present invention, if the corresponding optical fiber signal is not triggered when the needle driving mechanism is at the x-axis signal triggering position or the y-axis signal triggering position, the needle driving mechanism adjusts the position of the needle within a threshold range. If the corresponding optical fiber signal is still not triggered, it is determined that the needle deformation exceeds the threshold. Further, when the needle driving mechanism does not trigger the corresponding optical fiber signal at the x-axis signal triggering position, the needle driving mechanism adjusts the position of the needle along the x and z axes within the threshold range; when the needle does not trigger the corresponding optical fiber signal at the y-axis signal triggering position, the needle driving mechanism adjusts the position of the needle along the y and z axes within the threshold range.

[0041] In other words, during the detection process, a reasonable threshold 'a' can be set. Even if the needle does not trigger the corresponding fiber optic signal, as long as the needle can still trigger within a certain threshold range, it can be determined that the needle can continue to be used. Therefore, when the needle drive mechanism is in the x-direction signal trigger position, it can drive the needle to move within the threshold range defined by the x and z directions. That is, when the coordinate range of the needle drive mechanism is (x1±a, y1, z1±a), if the y-direction fiber 2 is triggered within the threshold range, it indicates that the deformation of the needle is within the threshold range. When the needle drive mechanism is in the y-direction signal trigger position, it can drive the needle to move within the threshold range defined by the y and z directions. That is, when the coordinate range of the needle drive mechanism is (x2, y2±a, z2±a), if the x-direction fiber 1 is triggered within the threshold range, it indicates that the deformation of the needle is within the threshold range.

[0042] In summary, this invention first locates the trigger positions of the x-axis fiber 1 and y-axis fiber 2 corresponding to the lower end of the needle before operation. When testing is required, the needle is moved to the x-axis signal trigger position and the y-axis signal trigger position. Whether the needle triggers the x-axis fiber 1 and y-axis fiber 2 is used to determine whether the degree of needle deformation exceeds the threshold and whether it can continue to be used, so as to replace unqualified needles in a timely manner. The detection speed is relatively fast, no human observation is required, and the direct detection method makes the detection results more accurate.

[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for detecting the deformation of a working needle, characterized in that, include: S1. The y-direction position of the needle is calibrated using an x-direction optical fiber before the needle is put into operation to determine the y-direction signal trigger position. The x-direction optical fiber is parallel to the x-axis. Step S1 specifically includes: S11. Determine the detection range; S12. Move the newly installed needle into the detection range; S13. Adjust the needle height so that the lower end of the needle is lower than the x-direction optical fiber; S14. Adjust the needle position to trigger the x-axis fiber to find the y-axis signal trigger position at the lower end of the needle. Step S14 specifically includes: S141. The needle reciprocates along the y-direction until it triggers the x-direction optical fiber and then stops. S142. Move the needle upward until the signal in the x-direction fiber disappears, then move it back and forth along the y-direction. If the x-direction fiber is triggered again, repeat this step until the needle can no longer trigger the x-direction fiber when moving back and forth along the y-direction. S143. If the downward movement of the needle triggers the x-axis fiber, it is recorded as the y-axis signal trigger position. If it does not trigger the x-axis fiber, it moves back and forth along the y-axis until it triggers the x-axis fiber, which is then recorded as the y-axis signal trigger position. S2. Before the needle tip works, the x-direction position of the needle tip is calibrated by the y-direction optical fiber to determine the x-direction signal trigger position. The y-direction optical fiber is parallel to the y-axis, and the x-direction optical fiber and the y-direction optical fiber are at the same horizontal height. S3. When testing is required during the operation of the needle, move the needle to the x-axis signal trigger position and the y-axis signal trigger position. If the fiber optic signal is not triggered at either the x-axis signal trigger position or the y-axis signal trigger position, the needle needs to be replaced; otherwise, the needle can continue to be used. Step S3 specifically includes: first moving the needle to the x-direction signal trigger position; if the y-direction fiber is triggered, then moving it to the y-direction signal trigger position; if the x-direction fiber is triggered, the needle can continue to be used; or first moving the needle to the y-direction signal trigger position; if the x-direction fiber is triggered, then moving it to the x-direction signal trigger position; if the y-direction fiber is triggered, the needle can continue to be used. If the corresponding fiber optic signal is not triggered when the needle is in the x-axis or y-axis signal trigger position, the position of the needle is adjusted within the threshold range. If the corresponding fiber optic signal is still not triggered, the needle needs to be replaced.

2. The method for detecting deformation of a working needle according to claim 1, characterized in that, Step S2 specifically includes: S21. Determine the detection range; S22. Move the newly installed needle into the detection range; S23. Adjust the needle height so that the lower end of the needle is lower than the y-direction optical fiber; S24. Adjust the needle position to trigger the y-direction fiber, thereby finding the x-direction signal trigger position at the lower end of the needle.

3. The method for detecting deformation of a working needle according to claim 2, characterized in that, Step S24 specifically includes: S241. The needle reciprocates along the x-direction until it triggers the y-direction optical fiber and then stops. S242. Move the needle upward until the signal in the y-direction fiber disappears, then move it back and forth along the x-direction. If the y-direction fiber is triggered again, repeat this step until the needle can no longer trigger the y-direction fiber when moving back and forth along the x-direction. S243. If the needle moves downward and triggers the y-axis fiber, it is recorded as the x-axis signal trigger position. If it does not trigger the y-axis fiber, it moves back and forth along the x-axis until it triggers the y-axis fiber, and then it is recorded as the x-axis signal trigger position.

4. The method for detecting deformation of a working needle according to claim 1, characterized in that, If the needle does not trigger the corresponding fiber optic signal at the x-axis signal trigger position, the needle position is adjusted along the x and z axes within the threshold range. If the needle does not trigger the corresponding fiber optic signal at the y-axis signal trigger position, the needle position is adjusted along the y and z axes within the threshold range.

5. The method for detecting deformation of a working needle according to claim 1, characterized in that, Let the detection length of the x-direction fiber be X, and the detection length of the y-direction fiber be Y. Then the detection range is a rectangular area with length X and width Y. When searching for the y-direction signal trigger position or the x-direction signal trigger position at the lower end of the needle, the needle remains within the rectangular area.

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