WO2020057377A1

WO2020057377A1 - Leadscrew sorting system and method

Info

Publication number: WO2020057377A1
Application number: PCT/CN2019/104561
Authority: WO
Inventors: 郭召; 王慧亮
Original assignee: 西安大医集团有限公司; 北京大医通汇创新科技有限公司
Priority date: 2018-09-19
Filing date: 2019-09-05
Publication date: 2020-03-26
Also published as: CN109174678A

Abstract

A leadscrew sorting system (100), comprising: a rotation driving device (1) connected to an end of a leadscrew (4) and configured to drive the leadscrew to rotate; an image data acquisition device (2) configured to acquire and enlarge an image of the leadscrew when the leadscrew is rotated, and to upload data of an enlarged leadscrew image (3a); and a display (3) connected to the image data acquisition device, and configured to display the enlarged leadscrew image and display an error boundary (3c), so as to perform leadscrew sorting according to the leadscrew image and the error boundary. A leadscrew sorting method applied to the sorting system is also provided.

Description

Screw rod sorting system and method

This disclosure claims the priority of a Chinese patent publication filed on September 19, 2018 with the State Intellectual Property Office, application number 201811094513.8, and public name "Screw Sorting System and Method", the entire contents of which are incorporated herein by reference in.

Technical field

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

Background technique

In radiotherapy, conformal intensity modulation technology is an advanced treatment method, and multi-leaf gratings are the key devices to achieve conformal intensity modulation. Multi-leaf gratings are composed of multiple sets of blades, each of which moves independently under the driving of a screw rod, and forms different shooting fields through the cooperation between the blades.

The screw rod has a small diameter and a large aspect ratio, and belongs to a miniature slender rod (for example, a diameter of 1.5 mm and a length of 200 mm), which has poor rigidity and is easy to bend. The bending of the screw rod will cause swaying during the blade movement, which will cause noise and stagnation, affect the flexibility of the blade movement, and also reduce its own life. After the processing of the screw is completed, the quality is uneven, and the amount of deflection during the rotation of different screws may be different. In order to ensure the reliability of the equipment, the deflection amount of the screw rod needs to be tested to sort out the screw rods with acceptable deflection amount.

Summary of the Invention

In one aspect, a screw sorting system is provided, including: a rotation drive device connected to one end of the screw and configured to drive the screw to rotate; and an image data acquisition device configured to rotate the screw when the screw is rotated To acquire and enlarge the image of the lead screw and upload the enlarged image data of the lead screw; a display connected to the image data acquisition device is configured to display the enlarged lead screw image and display an error boundary , So as to sort the screw rod according to the screw rod image and the error boundary.

In some embodiments, the image data acquisition device is disposed outside an outer peripheral surface of the screw rod, and an observation direction thereof is perpendicular to an axial direction of the screw rod; or the image acquisition device is disposed on the screw rod. An outer side of an end remote from the rotary driving device has an observation direction along an axial direction of the screw rod.

In some embodiments, the lead screw sorting system further includes: a controller connected to the display, configured to determine the error boundary, and control the display to display the error boundary; the controller further It is connected with the image data acquisition device and is configured to acquire a screw image of the screw in the rotation process in real time, and determine whether a screw boundary in the obtained screw image exceeds the error boundary, so as to detect the The screw is sorted.

In some embodiments, the lead screw sorting system further includes: an input device connected to the controller, configured to input a maximum allowable deflection amount of the lead screw to the controller, so as to facilitate the The controller determines the error boundary.

In another aspect, a screw sorting method is provided, which is applied to the screw sorting system as described above. The screw sorting method includes: a rotation driving device drives the screw to rotate; during the rotation of the screw The image data acquisition device acquires and enlarges the image of the screw rod, and uploads the enlarged screw rod image data; the display shows the enlarged screw rod image, and displays an error boundary, so as to facilitate the calculation based on the screw rod image and the error Boundaries sort the screws.

In some embodiments, the screw sorting method further includes: the controller sorts the screw according to the screw image and the error boundary.

In some embodiments, the controller sorts the screw rod according to the screw rod image and the error boundary, including: the controller acquires the screw rod image during the rotation of the screw rod in real time, and judges Whether the lead screw boundary in the obtained lead screw image exceeds the error boundary, if yes, it is determined that the lead screw is unqualified; if not, it is determined that the lead screw is qualified.

In some embodiments, 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 that the Whether the screw boundary in the screw image exceeds the error boundary includes: when the controller determines that the screw boundary in the screw image is within the first-level error boundary, determining that the screw is qualified and Is the first level; when the controller determines that the screw boundary in the screw image is outside the first level error boundary and is within the second level error boundary, the controller determines that the screw is qualified and is the first Second level; when the controller determines that the screw boundary in the screw image is outside the second level error boundary, the controller determines that the screw is unqualified.

In some embodiments, 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.

In some embodiments, the controller determining the error boundary includes: the controller obtaining a maximum allowable deflection amount of the screw rod; and the controller determining the error boundary according to the maximum allowable deflection amount.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solution in the embodiments of the present disclosure more clearly, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are just some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings may be obtained based on these drawings.

1 is a schematic structural diagram of a screw sorting system according to some embodiments of the present disclosure;

2 is another schematic structural diagram of a screw sorting system according to some embodiments of the present disclosure;

FIG. 3 is a flowchart of a screw sorting method according to some embodiments of the present disclosure; FIG.

4 is another flowchart of a screw sorting method according to some embodiments of the present disclosure;

FIG. 5 is another flowchart of a screw sorting method according to some embodiments of the present disclosure; FIG.

FIG. 6 is another flowchart of a screw sorting method according to some embodiments of the present disclosure; FIG.

7 is another flowchart of a screw sorting method according to some embodiments of the present disclosure;

FIG. 8 is another flowchart of a screw sorting method according to some embodiments of the present disclosure; FIG.

9 is a schematic diagram of an error boundary displayed on a display screen in a screw sorting method according to some embodiments of the present disclosure.

detailed description

Hereinafter, some embodiments of the present disclosure will be described with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, and not all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art fall within the protection scope of the present disclosure.

For the lead screw in the multi-leaf grating for conformal emphasis technology, the deflection of the lead screw needs to be tested to sort out the lead screw with a qualified deflection amount. Some embodiments of the present disclosure provide a screw sorting system 100. As shown in FIG. 1, the screw sorting system 100 includes a rotary drive device 1, an image data acquisition device 2, and a display 3. Among them, the rotation driving device 1 is connected to one end of the screw rod 4 and is configured to drive the screw rod 4 to rotate; the image data acquisition device 2 is configured to acquire and enlarge the image of the screw rod 4 when the screw rod 4 rotates, and The enlarged screw image data is uploaded; the display 3 is connected to the image data acquisition device 2 and is configured to display the enlarged screw image 3a and display an error boundary 3c so as to facilitate the process according to the screw image 3a and the error boundary 3c. The screw rod 4 is sorted.

Among them, the boundary of the screw image 3a in the ideal state where the screw 4 is not bent when it is mounted on the rotary drive device 1 is referred to as a reference boundary 3b, and the error boundary 3c is outside the reference boundary 3b and between the reference boundary 3b The distance is less than or equal to m times the maximum allowable deflection amount of the screw 4 (that is, the maximum deflection amount allowed by the screw) (ie, H _max ). Magnification of 4.

It should be noted that the distance between the error boundary 3c and the reference boundary 3b can be set to be equal to m times the maximum allowable deflection amount of the screw rod 4 in order to accurately sort out the screw rod 4 with a qualified deflection amount; it can also be set It is m times smaller than the maximum allowable deflection of the screw rod 4 to improve the quality of the sorted screw rod 4.

In some embodiments, please refer to FIG. 1 again. The image data acquisition device 2 is disposed outside the outer peripheral surface of the screw rod 4, and its viewing direction is perpendicular to the axial direction of the screw rod 4. The screw rod in the displayed screw rod image 3 a is displayed. A side view image of the lead screw whose border is a long strip, and the error boundary 3c is two straight lines or rectangular frames or other figures on the periphery of the lead screw boundary in the lead screw image 3a or on the lead screw boundary.

In other embodiments, the image data acquisition device 2 is disposed outside the end of the screw rod 4 far from the rotary driving device 1, and the viewing direction is along the axial direction of the screw rod 4, and the screw rod boundary in the screw rod image 3 a is displayed. Is a circular cross section image of the screw rod, and the error boundary 3c is a ring on the periphery of the screw rod boundary or on the screw rod boundary in the screw rod image 3a.

In the above-mentioned screw sorting system 100, the rotation of the screw 4 is driven by the rotation driving device 1, the image data acquisition device 2 acquires and enlarges the image of the screw 4, and uploads the enlarged image data of the screw to the image data acquisition. The monitor 3 connected to the device 2 judges whether the screw boundary in the screw image 3a exceeds the error boundary 3c in real time by observing the screw 4 during one revolution in the display 3, and sorts out the qualified screw 4, namely, In the displayed screw image 3a, the screw boundary does not exceed the error 4 of the screw 4 and the screw 4 can be sorted conveniently and quickly.

The image data acquisition device 2 in the lead screw sorting system 100 can enlarge the lead screw 4 and display the image through the display 3. The deflection of the lead screw 4 can be observed intuitively and accurately, which overcomes the fact that the lead screw 4 is miniature. It is difficult to judge the errors caused by parts, and it is easy to misjudge the technical problems. And because the error boundary 3c is set on the display 3, it can be judged whether the screw 4 is qualified by judging whether the screw boundary in the screw image 3a exceeds the error boundary 3c. The operation is simple, the process is fast, and no tedious data collection is required. The process and complicated calculation can realize the batch and fast sorting of the screw rod 4.

As a possible design, the image data acquisition device 2 includes a high-power electron microscope. The high-power electron microscope can be used to magnify the lead screw 4 several times and upload the enlarged lead screw image data to the display 3, which can clearly and accurately observe the rotary motion and deflection of the lead screw 4, which overcomes the problem caused by the lead screw 4. It is a problem that is difficult to observe and the data is difficult to obtain due to micro parts.

In some embodiments, the manner of sorting the screw 4 according to the screw image 3a and the error boundary 3c may be to observe the screw image 3a by human eyes to determine whether the screw boundary in the screw image 3a exceeds The error boundary 3c further sorts the lead screw 4.

In other embodiments, the manner in which the screw rods 4 are sorted according to the screw rod image 3a and the error boundary 3c may be automatically sorted by using a hardware device and / or a software program. Referring to FIG. 2, the screw sorting system 100 further includes a controller 5 connected to the display 3 and configured to determine the error boundary 3 c and control the display 3 to display the error boundary 3 c. The controller 5 is also connected to the image data acquisition device 2. The connection is configured to acquire the screw image 3a of the screw 4 during rotation in real time, and determine whether the screw boundary in the obtained screw image 3a exceeds the error boundary 3c to sort the screw 4.

In the above embodiment, the error boundary 3c is determined by the controller 5 and the display 3 is controlled to display the error boundary 3c. It is not necessary to set the error boundary 3c by manual adjustment, which simplifies the operation and improves the accuracy through the operation of the machine. In addition, the controller 5 can obtain the screw image 3a of the screw 4 during the rotation in real time, and then automatically determine whether the screw boundary in the obtained screw image 3a exceeds the error boundary 3c, and perform the measurement 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 accurate.

In some embodiments, the controller 5 may be a CPU (Central Processing Unit, Central Processing Unit), an MCU (Microcontroller Unit, Microcontrol Unit), a combination logic controller, a microprogram controller, and the like.

As a possible design, referring to FIG. 2, the lead screw sorting system 100 further includes: an input device 6 connected to the controller 5 and configured to input the maximum allowable deflection amount of the lead screw 4 to the controller 5 so as to facilitate The controller 5 determines an error boundary 3c.

In some embodiments, the input device 6 may be a mouse, a keyboard, a voice input device (such as a microphone), a touch screen, and the like.

As a possible design, referring to FIG. 2, the screw sorting system 100 further includes a voice prompting device 7 connected to the controller 5. When the controller 5 determines that the screw 4 is qualified, the voice prompting device 7 broadcasts the wire. Information such as the qualified rod or the level of the screw rod, so as to sort the screw rod 4 makes the screw rod sorting process more convenient and quick.

As a possible design, please refer to FIG. 2 again. The rotary driving device 1 includes: a clamping member 11 and an electrode 12, the clamping member 11 is configured to clamp one end of the screw rod 4, and the motor 12 is connected to the clamping member 11. Is configured to drive the screw 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.

Some embodiments of the present disclosure also provide a screw sorting method. The screw sorting method is applied to the screw sorting system 100 provided in the above embodiment. As shown in FIG. 3, the screw sorting The method includes the following steps:

S10. The rotation driving device 1 drives the screw rod 4 to rotate.

In the above step S10, referring to FIG. 2 again, the screw rod 4 is mounted on the rotation driving device 1, and the motor 12 is used to drive the screw rod 4 to rotate.

S20. During the rotation of the screw rod 4, the image data acquisition device 2 acquires and enlarges 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 rod 4, the image data acquisition device 2 (for example, a high magnification microscope) is used to acquire and enlarge the image of the screw rod 4, and upload the enlarged screw rod image data to the display 3.

S30. The display 3 displays the enlarged screw rod image 3a, and displays an error boundary 3c, so as to sort the screw rod 4 according to the screw rod image 3a and the error boundary 3c.

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

By using the above-mentioned screw sorting method, the enlarged screw image 3a can be visually observed, and by determining whether the screw boundary in the screw image 3a displayed by the screw 4 during the rotation of the screw 4 exceeds the error boundary 3c, Sorting the screw rod 4 according to the judgment result. The screw rod sorting method is simple in operation and strong in practicability. It does not require complicated data collection and calculation processes, and can realize large-scale sorting of the screw rod 4, which improves efficiency and is convenient for use in the production line.

In some embodiments, the step of sorting the screw 4 according to the screw image 3a and the error boundary 3c can be performed by human eyes to determine whether the screw boundary in the screw image 3a exceeds the error boundary 3c, and then manually sort.出 qualified screw 4.

In other embodiments, as shown in FIG. 4, the steps of sorting the screw rod 4 according to the screw rod image 3 a and the error boundary 3 c may be performed by using a hardware device and / or a software program for automatic sorting. The screw rod sorting method further includes: S40. The controller 5 sorts the screw rod 4 according to the screw rod image 3a and the error boundary 3c. The controller 5 automatically determines whether the screw rod 4 is qualified to save labor costs and is more accurate than judging by human eyes.

In some embodiments, as shown in FIG. 5, the controller 5 sorts the screw rod 4 according to the screw rod image 3 a and the error boundary 3 c. The step S40 includes:

S401: The controller 5 acquires the screw image 3a of the screw 4 in the turning process in real time.

In step S402, it is determined whether the screw boundary in the obtained screw image 3a exceeds the error boundary 3c. If yes, it is determined that the screw 4 is unqualified; if not, it is determined that the screw 4 is qualified.

In the above embodiment, during the rotation of the screw rod 4, as long as the screw rod boundary in the displayed screw rod image 3a exceeds the error boundary 3c, the screw rod 4 is regarded as a defective product. The screw boundary in the rod image 3a does not exceed the error boundary 3c, then the screw 4 is a qualified product, and the operation is simple and standardized, which further improves the accuracy and efficiency of the screw 4 sorting and shortens the sorting of the screw 4 time.

In order to further subdivide the quality of the screw rod 4 to meet different design requirements, as a possible design, as shown in FIG. 6 and FIG. 9, the error boundary 3c includes at least: the first level error boundary 3c-1 and The second-level error boundary 3c-2, and the first-level error boundary 3c-1 is located within the second-level error boundary 3c-2.

The controller 5 determines whether the screw boundary in the screw image 3a exceeds the error boundary 3c. Step S402 further includes:

When the controller 5 determines that the screw boundary in the screw image 3a is within the first-level error boundary 3c-1, it determines that the screw 4 is qualified and the first level.

When the controller 5 determines that the screw boundary in the screw image 3a is outside the first-level error boundary 3c-1 and is within the second-level error boundary 3c-2, it determines that the screw 4 is qualified and is the second level.

When the controller 5 determines that the screw boundary in the screw image 3a is outside the second-level error boundary 3c-2, it determines that the screw 4 is unqualified.

By adopting the above method, it is possible to quickly and easily determine the level of the screw rod 4, and on the basis of determining that the screw rod 4 is a qualified product, it is further judged whether the screw rod 4 is a superior or inferior product, and the screw rod is improved. 4 yield. The application of a superior screw rod 4, such as the first-ranked screw rod 4, to a multi-leaf grating, because of its small deflection and high quality, can improve the service life and flexibility of the multi-blade of the multi-leaf grating. And then play a significant role in conformal intensity modulation technology.

With reference to the above method, a person skilled in the art knows that the number of groups of the error boundary 3c should not be limited to two groups, and may also include one, three, or more than three groups of error boundaries to determine the quality level of the screw 4 and adapt. Different sorting requirements for the amount of screw deflection.

As a possible design, as shown in FIG. 7 and FIG. 8, before the display 3 displays the error boundary 3 c, it further includes:

S201. The controller 5 determines an error boundary 3c.

In some embodiments, step S201 of the controller 5 determining the error boundary 3c includes:

S2011, the controller 5 obtains the maximum allowable yaw amount of the screw rod 4.

S2012, the controller 5 determines the error boundary 3c according to the maximum allowable yaw amount.

Exemplarily, the above steps include the following process: acquiring the magnification m of the displayed enlarged screw image 3a relative to the actual screw 4, the acquisition method may be: directly reading the magnification m of the image data acquisition device 2, The magnification m can also be obtained by calculating the ratio of the displayed screw image 3a to the diameter of the real screw 4. The maximum allowable yaw amount h _{max of the} screw rod 4 is input to the controller 5 through the input device 6. The controller 5 calculates the distance H _max between the error boundary 3 c and the corresponding reference boundary 3 b according to the magnification factor m and the maximum allowable deflection amount h _{max of the} screw rod 4, H _max = m × h _max .

S202. The controller 5 sends the error boundary 3c to the display 3. The display 3 thus displays the error boundary 3c on the periphery of the screw image 3a.

The above are only specific implementations of the present disclosure, but the scope of protection of the present disclosure is not limited to this. Any change or replacement that can be easily conceived by those skilled in the art within the technical scope disclosed in the present disclosure should be covered. Within the scope of this disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

A screw sorting system includes:

The slewing driving device is connected to one end of the screw and is configured to drive the screw to rotate;

An image data acquiring device configured to acquire and enlarge an image of the screw rod when the screw rod is rotated, and upload the enlarged screw rod image data;

A display connected to the image data acquisition device is configured to display the enlarged screw image and display an error boundary so as to sort the screw according to the screw image and the error boundary.
The lead screw sorting system according to claim 1, wherein the image data acquisition device is disposed outside an outer peripheral surface of the lead screw, and an observation direction thereof is perpendicular to an axial direction of the lead screw; or,

The image acquisition device is disposed on an outer side of an end of the screw rod remote from the rotary driving device, and an observation direction thereof is along an axial direction of the screw rod.
The screw sorting system according to claim 1, wherein the screw sorting system further comprises: a controller connected to the display, configured to determine the error boundary, and control the display to display Mentioned error boundary;

The controller is also connected to the image data acquisition device and is configured to acquire a screw image of the screw in the rotation process in real time, and determine whether a screw boundary in the acquired screw image exceeds the error boundary. To sort the lead screw.
The screw sorting system according to claim 3, wherein the screw sorting system further comprises: an input device connected to the controller, configured to input a maximum of the screw to the controller. The amount of yaw is allowed so that the controller can determine the error boundary.
A screw sorting method applied to the screw sorting system according to any one of claims 1 to 4, the screw sorting method comprising:

The slewing drive device drives the screw rod to rotate;

During the rotation of the screw rod, the image data acquisition device acquires and enlarges the image of the screw rod, and uploads the enlarged image data of the screw rod;

The display displays the enlarged image of the screw rod, and displays an error boundary, so as to sort the screw rod according to the image of the screw rod and the error boundary.
The method for sorting a screw rod according to claim 5, wherein the method for sorting a screw rod further comprises: a controller sorting a screw rod according to the screw rod image and the error boundary.
The method for sorting a screw rod according to claim 6, wherein the controller sorts the screw rod according to the screw rod image and the error boundary, comprising: the controller acquiring the screw rod in real time During the rotation of the screw image, it is determined whether the screw boundary in the obtained screw image exceeds the error boundary, and if it is, the screw is unqualified; if not, the screw is qualified.
The screw sorting method according to claim 6, wherein 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 at the second-level error boundary Inside;

The controller determining whether a screw boundary in the screw 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, it determines that the lead screw is qualified and is of the first level;

When the controller determines that the screw boundary in the screw image is outside the first-level error boundary and is within the second-level error boundary, determining that the screw is qualified and is the second level;

When the controller determines that the screw boundary in the screw image is outside the second-level error boundary, the controller determines that the screw is unqualified.
The screw sorting method according to claim 5, wherein before the display displays the error boundary, further comprising:

The controller determines the error boundary;

The controller sends the error boundary to the display.
The screw sorting method according to claim 9, wherein the controller determining the error boundary comprises:

The controller obtains the maximum allowable deflection amount of the screw rod;

The controller determines the error boundary according to the maximum allowable yaw amount.