CN109174678A - Screw rod sorting system and method - Google Patents

Abstract

The invention provides a lead screw sorting system to realize rapid sorting of lead screws. The lead screw sorting system includes: a rotary drive device, connected with one end of the lead screw, for driving the lead screw to rotate; an image data acquisition device for acquiring and amplifying the image of the lead screw when the lead screw is rotating, and to The enlarged lead screw image data is uploaded; the display connected with the image data acquisition device is used to display the enlarged lead screw image and display the error boundary, so as to facilitate the lead screw operation according to the lead screw image and the error boundary. sorting. The above system is used in the process of sorting the screw rods, so as to sort out the screw rods with qualified deflection.

Description

Screw sorting system and method

technical field

The invention relates to the technical field of instrument measurement, in particular to a screw sorting system and method.

Background technique

In radiotherapy treatment, conformal intensity modulation technology is an advanced treatment method, and multi-leaf grating is the key device to realize conformal intensity modulation. The multi-leaf grating is composed of multiple sets of blades, each blade moves independently under the drive of the screw, and different fields are formed through the cooperation between the blades.

The screw rod has a small diameter and a large aspect ratio, and is a micro-slender rod (for example: 1.5mm in diameter and 200mm in length), with poor rigidity and easy bending. The bending of the lead screw will cause the blade to sway during the movement, resulting in noise and jamming, affecting the flexibility of the blade movement and reducing its own life. After the screw rod is processed, the quality is uneven, and the deflection of different screw rods during the rotation process may be different. In order to ensure the reliability of the equipment, it is necessary to test the deflection of the lead screw to sort out the lead screw with qualified deflection.

SUMMARY OF THE INVENTION

In view of the above-mentioned current situation in the prior art, the embodiments of the present invention provide a system and method for sorting screw rods, so as to realize rapid sorting of screw rods.

To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

In a first aspect, an embodiment of the present invention provides a lead screw sorting system, the lead screw sorting system includes: a rotary drive device connected to one end of the lead screw for driving the lead screw to rotate; an image data acquisition device, It is used to acquire and amplify the image of the screw rod when the screw rod rotates, and upload the enlarged screw rod image data; the display connected with the image data acquisition device is used to display the enlarged screw rod image data. , and display the error boundary, so that the lead screw can be sorted according to the screw image and the error boundary.

Compared with the prior art, the screw sorting system provided by the present invention has the following beneficial effects:

In the above-mentioned screw sorting system, the rotary drive device is used to drive the screw to rotate, and the image data acquisition device acquires and amplifies the image of the screw, and uploads the enlarged image data of the screw to the display connected to the image data acquisition device, By observing in the display that the screw rotates for one cycle, it can be judged in real time whether the screw boundary of the screw image exceeds the error boundary, and the qualified screw, that is, the screw that does not exceed the error boundary, can be easily and quickly sorted out. Ground-to-screw sorting is achieved. The image data acquisition device in the screw sorting system can amplify the screw and display the image through the display, so that the deflection of the screw can be observed intuitively and accurately, which overcomes the difficulty of errors caused by the screw being a miniature part. Judgment is a technical problem that is easy to misjudge, and because the error boundary is set on the display, it is possible to judge whether the screw is qualified by judging whether the screw boundary in the screw image exceeds the error boundary, the operation is simple, the process is fast, and it can be realized Batch quick sorting of screw rods.

Optionally, the image data acquisition device is arranged on the outer side of the outer peripheral surface of the lead screw, and its observation direction is perpendicular to the axial direction of the lead screw; The outer side of one end of the rotary drive device, and its viewing direction is along the axial direction of the screw rod.

Optionally, the lead screw sorting system further includes: a controller connected to the display for determining the error boundary and controlling the display to display the error boundary; the controller is further connected with the display The image data acquisition device is connected to acquire the screw image of the screw in the rotating process in real time, and judge whether the screw boundary in the acquired screw image exceeds the error boundary, so as to classify the screw. pick.

Optionally, the lead screw sorting system further includes: an input device connected to the controller for inputting the maximum allowable deflection of the lead screw to the controller, so that the controller can determine the error boundary.

In a second aspect, an embodiment of the present invention provides a screw sorting method, which is applied to the screw sorting system as described above. The screw sorting method includes: a rotary drive device drives the screw to rotate; During the rotation of the screw, the image data acquisition device acquires and amplifies the image of the screw, and uploads the enlarged screw image data; the display displays the enlarged screw image and the error boundary, so as to facilitate according to the screw image and the error boundary to sort the lead screw.

With the above-mentioned screw sorting method, the enlarged image of the screw can be observed intuitively, and the screw can be sorted according to the judgment result by judging whether the displayed image exceeds the error boundary during the rotation of the screw, and the operation is simple. It has strong practicability and does not require complicated data acquisition and calculation process. It can sort the screw rods in large quantities, which improves the efficiency and is convenient for use in the production line.

Optionally, the method for sorting the screw rods further includes: the controller sorts the screw rods according to the screw rod image and the error boundary.

Optionally, the controller sorts the lead screw according to the lead screw image and the error boundary, including: the controller acquires the lead screw image of the lead screw during the rotation process in real time, and determines the obtained lead screw image. Whether the lead screw boundary in the lead screw image exceeds the error boundary, if so, the lead screw is determined to be unqualified; if not, the lead screw is determined to be qualified.

Optionally, the error boundary includes at least: a first-level error boundary and a second-level error boundary, and the first-level error boundary is located within the second-level error boundary; the controller determines the lead screw Whether the lead screw boundary in the image exceeds the error boundary includes: when the controller determines that the lead screw boundary in the lead screw image is within the first level error boundary, determining that the lead screw is qualified and is the first level error boundary. Level 1; when the controller determines that the lead screw boundary in the lead screw image is outside the error boundary of the first level and within the error boundary of the second level, the controller determines that the lead screw is qualified and is of the second level ; When the controller determines that the lead screw boundary in the lead screw image is outside the second-level error boundary, it determines that the lead screw is unqualified.

Optionally, before the display displays the error boundary, the method further includes: the controller determines the error boundary; and the controller sends the error boundary to the display.

Optionally, the controller determining the error boundary includes: the controller obtains a maximum allowable deflection amount of the lead screw; and the controller determines the error boundary according to the maximum allowable deflection amount.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic diagram of the basic structure of a screw sorting system provided by an embodiment of the present invention;

2 is a schematic diagram of a specific structure of a screw sorting system provided by an embodiment of the present invention;

Fig. 3 is the basic flow chart of the screw sorting method provided by the embodiment of the present invention;

Fig. 4 is the first specific flow chart of the screw sorting method provided by the embodiment of the present invention;

Fig. 5 is the second specific flow chart in the screw sorting method provided by the embodiment of the present invention;

Fig. 6 is the third specific flow chart in the screw sorting method provided by the embodiment of the present invention;

7 is a first flow chart of some steps in the screw sorting method provided by the embodiment of the present invention;

8 is a second flow chart of some steps in the screw sorting method provided by the embodiment of the present invention;

FIG. 9 is a schematic diagram of error boundaries displayed on a display screen in a screw sorting method provided by an embodiment of the present invention.

Description of reference numbers:

1- rotary drive device; 11- clamping part;

12-motor; 2-image data acquisition device;

3-display; 4-screw;

5- Screw image; 6- Reference boundary;

7-error boundary; 71-first-level error boundary;

72-second-level error boundary; 8-controller;

9-input device; 10-voice prompt device.

Detailed ways

In order to make the above objects, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

For the lead screw in the multi-leaf grating for conformal emphasis technology, it is necessary to test the deflection of the lead screw to sort out the lead screw with qualified deflection. The embodiment of the present invention provides a lead screw sorting System, as shown in Figure 1, the screw sorting system includes: a rotary drive device 1, connected with one end of the screw 4, for driving the screw 4 to rotate; an image data acquisition device 2, used for During rotation, the image of the screw 4 is acquired and enlarged, and the enlarged screw image data is uploaded; the display 3 connected with the image data acquisition device 2 is used to display the enlarged screw image 5 and display the error boundary 7 , so as to sort the screw 4 according to the screw image 5 and the error boundary 7 .

Among them, the boundary of the screw image 5 in the ideal state where the screw 4 is installed on the rotary drive device 1 without bending is referred to as the reference boundary 6, and the error boundary 7 is on the periphery of the reference boundary 6, and between the reference boundary 6 and the reference boundary 6 The distance is less than or equal to m times (ie, H _max ) of the maximum allowable deflection of the lead screw 4 (ie, the maximum deflection allowed to be set by the lead screw), where m is the magnified lead screw image 5 relative to the real silk Magnification of rod 4.

It should be noted that the distance between the error boundary 7 and the reference boundary 6 can be set to be equal to m times the maximum allowable deflection of the lead screw 4, so as to accurately sort out the lead screw 4 with qualified deflection; M times less than the maximum allowable deflection of the lead screw 4, so as to improve the quality of the sorted lead screw 4.

In some embodiments, when the image data acquisition device 2 is disposed outside the outer peripheral surface of the lead screw 4, and its observation direction is perpendicular to the axial direction of the lead screw 4, the lead screw boundary in the displayed lead screw image 5 is: In the side view image of the elongated lead screw, the error boundary 7 is two straight lines or rectangular boxes or other figures on the periphery of the lead screw boundary or on the lead screw boundary in the lead screw image 5 . When the image data acquisition device 2 is disposed outside the end of the screw 4 away from the rotary drive device 1, and its observation direction is along the axial direction of the screw 4, the displayed screw image 5 shows the screw border of the screw as a circular wire In the cross-sectional image of the screw, the error boundary 7 is a ring located on the periphery of the screw boundary or on the screw boundary in the screw image 5 .

In the above-mentioned lead screw sorting system, the rotary drive device 1 is used to drive the lead screw 4 to rotate, and the image data acquisition device 2 acquires and amplifies the image of the lead screw 4, and uploads the enlarged lead screw image data to the image data acquisition device. 2 connected to the display 3, by observing the screw 4 in the display 3 in the process of one rotation, it is judged in real time whether the screw boundary in the screw image 5 exceeds the error boundary 7, and the qualified screw 4 is sorted out. For the lead screw 4 that exceeds the error boundary 7, the lead screw 4 can be sorted conveniently and quickly.

The image data acquisition device 2 in the lead screw sorting system can amplify the lead screw 4 and display the image through the display 3, so that the deflection of the lead screw 4 can be observed intuitively and accurately, which overcomes the problem that the lead screw 4 is a miniature part. The resulting error is difficult to judge, and it is a technical problem that is easily misjudged. And because the error boundary 7 is set on the display 3, it is possible to judge whether the screw 4 is qualified by judging whether the screw boundary in the screw image 5 exceeds the error boundary 7, the operation is simple, the process is fast, and tedious data collection is not required. The process and complex calculation can realize the batch and fast sorting of the screw 4.

As a possible design, the image data acquisition device 2 includes a high-power electron microscope. Using a high-power electron microscope, the lead screw 4 can be magnified several times, and the enlarged lead screw image data can be uploaded to the display 3, so that the rotary motion and deflection of the lead screw 4 can be observed clearly and accurately, which overcomes the problems caused by the lead screw 4. It is the problem that the data caused by the micro parts is not easy to observe and obtain.

In some embodiments, the way of sorting the lead screw 4 according to the lead screw image 5 and the error boundary 7 may be to observe the lead screw image 5 through human eyes to determine the lead screw boundary in the lead screw image 5 Whether the error boundary 7 is exceeded, and then the lead screw 4 is sorted.

In other embodiments, according to the way of sorting the screw 4 according to the screw image 5 and the error boundary 7, a hardware device and/or a software program may be used for automatic sorting. Referring to FIG. 2, the screw sorting system further includes: a controller 8 connected with the display 3, for determining the error boundary 7, and controlling the display 3 to display the error boundary 7; the controller 3 is also connected with the image data acquisition device 2, It is used to acquire the screw image 5 of the screw 4 in the rotating process in real time, and to determine whether the screw boundary in the acquired screw image 5 exceeds the error boundary 7, so as to sort the screw 4 .

In the above embodiment, the controller 8 determines the error boundary 7 and controls the display 3 to display the error boundary 7 without manual adjustment and setting of the error boundary 7, which simplifies the operation and improves the accuracy through machine operation. And the controller 8 can acquire the screw image 5 of the screw 4 in the rotating process in real time, and then automatically judges whether the screw boundary in the acquired screw image 5 exceeds the error boundary 7, and performs the operation on the screw 4 according to the judgment result. Sorting does not need to be judged by human eyes, making the operation process faster, more efficient and more accurate.

In some embodiments, the controller 8 may be a CPU (Central Processing Unit, central processing unit), an MCU (Microcontroller Unit, micro control unit), a combinational logic controller, a microcontroller, and the like.

As a possible design, referring to FIG. 2 , the lead screw sorting system further includes: an input device 9 connected to the controller 8 for inputting the maximum allowable deflection of the lead screw 4 to the controller 8 so as to facilitate the controller 8 Determine the error boundary 7.

In some embodiments, the input device 9 may be a mouse, a keyboard, a voice input device (eg, a microphone), a touch screen, or the like.

As a possible design, referring to FIG. 2 , the lead screw sorting system further includes: a voice prompt device 10 connected to the controller 8 , when the controller 8 determines that the lead screw 4 is qualified, the voice prompt device 10 broadcasts the lead screw According to the information such as qualification or lead screw grade, the lead screw 4 is sorted, which improves the feasibility of the lead screw sorting system.

As a possible design, referring to FIG. 2 , the rotary drive device 1 includes: a clamping part 11 for clamping one end of the screw rod 4 ; a motor 12 connected with the clamping part 11 for driving the screw rod 4 to rotate. In this way, one end of the screw rod 4 can be clamped and fixed by the clamping member 11 , and the screw rod 4 can be rotated under the driving of the motor 12 , the rotation speed is relatively stable, and the qualified screw rod 4 can be sorted out more accurately.

An embodiment of the present invention also provides a screw sorting method, which is applied to the screw sorting system provided in the above embodiment. As shown in FIG. 3 , the screw sorting method includes the following: step:

S10, the rotary drive device 1 drives the screw rod 4 to rotate.

In the above step S10, please refer to FIG. 2 again, the screw rod 4 is installed on the rotary drive device 1, and the motor 12 is used to drive the screw rod 4 to rotate.

S20, during the rotation process of the screw rod 4, the image data acquisition device 2 acquires and amplifies the image of the screw rod 4, and uploads the enlarged screw rod image data.

In the above step S20 , during the rotation of the screw 4 , the image data acquisition device 2 (eg, a high-power microscope) is used to acquire and enlarge the image of the screw 4 , and the enlarged screw image data is uploaded to the display 3 .

S30 , the display 3 displays the enlarged lead screw image 5 and the error boundary 7 , so that the lead screw 4 can be sorted according to the lead screw image 5 and the error boundary 7 .

In the above step S30, the enlarged lead screw image 5 and the error boundary 7 are displayed on the display 3. The error boundary 7 is located at the periphery of the reference boundary 6, and the distance from the reference boundary 6 is less than or equal to the maximum value of the lead screw 4. m times (ie, H _max ) of the allowable deflection amount (ie, the maximum deflection amount set by the allowable lead screw), where m is the magnification of the enlarged lead screw image 5 relative to the real lead screw 4 .

Using the above-mentioned screw sorting method, the enlarged screw image 5 can be observed intuitively, and it can be determined whether the screw boundary in the displayed screw image 5 during the rotation of the screw 4 exceeds the error boundary 7, The screw 4 is sorted according to the judgment result. The operation is simple, the practicability is strong, and complex data acquisition and calculation processes are not required, which can realize large-scale sorting of screw rods 4, improve efficiency, and facilitate use in the production line.

In some embodiments, the step of sorting the lead screw 4 according to the lead screw image 5 and the error boundary 7 may be to judge whether the lead screw boundary in the lead screw image 5 exceeds the error boundary 7 by human eyes, and then manually sort Qualified lead screw 4.

In other embodiments, as shown in FIG. 4 , in the step of sorting the screw 4 according to the screw image 5 and the error boundary 7 , a hardware device and/or a software program may be used for automatic sorting. The lead screw sorting method further includes: S40 , the controller 8 sorts the lead screw 4 according to the lead screw image 5 and the error boundary 7 . The controller 8 automatically judges whether the lead screw 4 is qualified, so as to save labor costs, and it is more accurate than human eye observation.

In some embodiments, as shown in FIG. 5 , the step S40 that the controller 8 sorts the lead screw 4 according to the lead screw image 5 and the error boundary 7 includes: S401 , the controller 8 acquires in real time the rotation process of the lead screw 4 In S402, it is judged whether the lead screw boundary in the obtained lead screw image 5 exceeds the error boundary 7, if so, it is judged that the lead screw 4 is unqualified; if not, it is judged that the lead screw 4 is qualified.

In the above embodiment, during the rotation process of the lead screw 4, as long as the lead screw boundary in the displayed lead screw image 5 exceeds the error boundary 7, the lead screw 4 will be identified as an unqualified product. The screw boundary in the screw image 5 does not exceed the error boundary 7, then the screw 4 is a qualified product, and the operation is simple and standardized, which further improves the accuracy and efficiency of the sorting of the screw 4, and shortens the sorting time of the screw 4. time.

In order to further subdivide the quality of the lead screw 4 to meet different design requirements, as a possible design, as shown in FIGS. 6 and 9 , the error boundary 7 at least includes: a first level error boundary 71 and a second level error boundary 71 A graded error boundary 72 , and a first graded error boundary 71 is located within a second graded error boundary 72 .

The step S402 of the controller 8 judging whether the lead screw boundary in the lead screw image 5 exceeds the error boundary 7 also includes:

When the controller 8 determines that the lead screw boundary in the lead screw image 5 is within the first level error boundary 71, it determines that the lead screw 4 is qualified and is of the first level;

When the controller 8 determines that the lead screw boundary in the lead screw image 5 is located outside the first level error boundary 71 and within the second level error boundary 72, it determines that the lead screw 4 is qualified and is of the second level;

When the controller 8 determines that the lead screw boundary in the lead screw image 5 is outside the second level error boundary 72, it determines that the lead screw 4 is unqualified.

By adopting the above method, the grade of the lead screw 4 can be judged conveniently and quickly. On the basis of judging that the lead screw 4 is a qualified product, it is further judged whether the lead screw 4 is a superior product or a second-class product, which improves the performance of the lead screw. 4. The high-quality lead screw 4, such as the lead screw 4 judged to be the first grade, is applied to the multi-leaf grating. Because of its small deflection and high quality, the use of multiple sets of blades of the multi-leaf grating can be improved. Longevity and flexibility, and then play a significant role in conformal IM technology.

With reference to the above method, those skilled in the art know that the number of groups of error boundaries 7 should not be limited to two groups, it can also include one group, three groups, or more than three groups of error boundaries, to determine the quality level of the screw 4, adapt to Different sorting requirements for lead screw deflection.

As a possible design, as shown in Figures 7 and 8, before the display 3 displays the error boundary 7, it also includes:

S201 , the controller 8 determines the error boundary 7 .

In some embodiments, the step S201 of the controller 8 determining the error boundary 7 includes: S2011, the controller 8 obtains the maximum allowable deflection of the lead screw 4; S2012, the controller 8 determines the error boundary 7 according to the maximum allowable deflection .

Exemplarily, the above steps include the following process: to obtain the magnification m of the displayed enlarged screw image 5 relative to the actual screw 4, the magnification m of the image data acquisition device 2 can be directly read, or the magnification m of the image data acquisition device 2 can be directly read. The ratio of the displayed lead screw image 5 to the diameter of the real lead screw 4 is the magnification m. The maximum allowable deflection amount h _max of the lead screw 4 is input to the controller 8 through the input device 9 . The controller 8 calculates the distance H _max between the error boundary 7 and its corresponding reference boundary 6 according to the magnification m and the maximum allowable deflection h _max of the lead screw 4 , where H _max =m×h _max .

S202 , the controller 8 sends the error boundary 7 to the display 3 . The display 3 thus displays the error boundary 7 on the periphery of the screw image 5 .

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or replacements that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered. within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (10)

1. A lead screw sorting system, characterized in that the lead screw sorting system comprises: A rotary drive device, connected with one end of the screw rod, is used to drive the screw rod to rotate; an image data acquisition device, used for acquiring and amplifying the image of the screw rod when the screw rod rotates, and uploading the enlarged screw rod image data; A display connected to the image data acquisition device is used for displaying the enlarged screw image and displaying error boundaries, so as to facilitate sorting the screw according to the screw images and the error boundaries. 2. The lead screw sorting system according to claim 1, wherein the image data acquisition device is disposed outside the outer peripheral surface of the lead screw, and its viewing direction is perpendicular to the axial direction of the lead screw; or , The image acquisition device is disposed outside the end of the screw rod away from the rotary drive device, and its observation direction is along the axial direction of the screw rod. 3 . The screw sorting system according to claim 1 , wherein the screw sorting system further comprises: a controller connected to the display for determining the error boundary and controlling the a display showing the error boundary; The controller is also connected with the image data acquisition device, and is used for real-time acquisition of the screw image of the screw during the rotation process, and judging whether the screw boundary in the acquired screw image exceeds the error boundary, to sort the screw. 4 . The screw sorting system according to claim 3 , wherein the screw sorting system further comprises: an input device connected to the controller for inputting the wire to the controller. 5 . The maximum allowable yaw of the rod for the controller to determine the error bound. 5. A lead screw sorting method, characterized in that, when applied to the lead screw sorting system according to any one of claims 1 to 4, the lead screw sorting method comprises: The rotary drive device drives the screw to rotate; During the rotation of the screw, the image data acquisition device acquires and amplifies the image of the screw, and uploads the enlarged image data of the screw; The display shows the enlarged lead screw image and the error boundary, so that the lead screw can be sorted according to the lead screw image and the error boundary. 6 . The screw sorting method according to claim 5 , wherein the screw sorting method further comprises: the controller sorting the screw according to the screw image and the error boundary. 7 . 7 . The method for sorting screw rods according to claim 6 , wherein the controller sorts the screw rods according to the screw rod images and the error boundary, comprising: the controller acquires all the screw rods in real time. 8 . The screw image of the screw during the rotation process is used to determine whether the screw boundary in the obtained screw image exceeds the error boundary. If so, it is determined that the screw is unqualified; if not, it is determined that the screw The screw rod is qualified. 8 . The screw sorting method according to claim 6 , wherein the error boundary at least comprises: a first-level error boundary and a second-level error boundary, and the first-level error boundary is located in the first level error boundary. 9 . within the second-level error boundary; The controller determines whether the lead screw boundary in the lead screw image exceeds the error boundary, including: When the controller determines that the lead screw boundary in the lead screw image is within the error boundary of the first level, it is determined that the lead screw is qualified and is of the first level; When the controller determines that the lead screw boundary in the lead screw image is located outside the first-level error boundary and within the second-level error boundary, it is determined that the lead screw is qualified and is of the second level; The controller determines that the lead screw is unqualified when it is determined that the lead screw boundary in the lead screw image is outside the second-level error boundary. 9. The screw sorting method according to claim 5, wherein before the display shows the error boundary, the method further comprises: the controller determines an error boundary; The controller sends the error bounds to the display. 10. The screw sorting method according to claim 5, wherein the controller determines the error boundary comprising: The controller obtains the maximum allowable deflection of the lead screw; The controller determines the error boundary based on the maximum allowable yaw amount.