阅读说明：本技术 一种螺纹通止检测装置及检测方法 (Thread passing and stopping detection device and detection method ) 是由 杨龙兴 顾杰宁 杨浩轩 张陈 于 2019-09-04 设计创作，主要内容包括：本发明涉及一种螺钉检测装置,特别涉及一种螺纹通止检测装置及检测方法,包括工作台,工作台上设有用于夹紧待测螺钉的夹紧机构,工作台上还设有X方向主摄像头,X方向主摄像头对面设有第一背光板,工作台上还设有Y方向辅助摄像头,Y方向辅助摄像头的对面设有第二背光板,本发明采用X、Y两个垂直方向摄像头进行背光条件下螺钉齿形等参数的获取和矫正方法,实现了螺纹的自动图像检测。(The invention relates to a screw detection device, in particular to a screw thread on-off detection device and a detection method, which comprise a workbench, wherein a clamping mechanism for clamping a screw to be detected is arranged on the workbench, a main camera in the X direction is also arranged on the workbench, a first backlight plate is arranged opposite to the main camera in the X direction, an auxiliary camera in the Y direction is also arranged on the workbench, and a second backlight plate is arranged opposite to the auxiliary camera in the Y direction.)

1. The thread passing and stopping detection device is characterized by comprising a workbench (1), wherein a clamping mechanism used for clamping a screw (8) to be detected is arranged on the workbench (1), an X-direction main camera (2) is further arranged on the workbench (1), a first backlight plate (3) is arranged opposite to the X-direction main camera (2), a Y-direction auxiliary camera (4) is further arranged on the workbench (1), and a second backlight plate (5) is arranged opposite to the Y-direction auxiliary camera (4).

2. A thread make-and-break detection device as claimed in claim 1, wherein: the clamping mechanism comprises V-shaped clamping cylinders (6) on two sides, and the V-shaped clamping cylinders (6) are clamped on the optical axis part of the screw (8).

3. A thread make-and-break detection device as claimed in claim 2, wherein: and a proximity switch (7) is arranged beside the V-shaped clamping cylinder (6).

4. A method for detecting a screw thread make-and-break detecting device according to claim 3, wherein: the method comprises the following steps:

step 1: firstly, a screw (8) is placed in the middle of a V-shaped block of a V-shaped clamping cylinder (6), and when a proximity switch (7) senses the screw (8), the V-shaped clamping cylinder (6) clamps the light cylinder part of the screw (8).

Step 2: the X-direction main camera (2) and the Y-direction auxiliary camera (4) are started to shoot, the Y-direction auxiliary camera (4) obtains a current thread center line, the X-direction camera obtains pictures of tooth profile, inner diameter and outer diameter, and the image simulation fitting is adopted for the middle diameter by a double-needle method.

And step 3: correct numerical values of the tooth profile, the inner diameter, the outer diameter and the middle diameter are obtained by correcting the deviation of the thread central line and the standard central line on the tooth profile corresponding to the measuring height, and are compared with standard thread data to judge whether the error is within a tolerance allowable range, and after the comparison and judgment are finished, the V-shaped clamping cylinder (6) is loosened to take out the screw (8).

5. The detection method of the thread on-off detection device according to claim 4, wherein: the data correction in step 3 is realized by the following steps: and multiplying the ratio of the deviation of the thread central line and the standard central line on the corresponding measuring height to the standard inner diameter, the standard outer diameter and the standard middle diameter by the measured inner diameter, the measured outer diameter and the standard middle diameter.

Technical Field

The invention relates to a screw detection device, in particular to a thread on-off detection device and a detection method.

Background

The screw is one of 6 simple machines invented by human earliest, has important functions in the field of connector products, and is often used for mounting connecting accessories and fixing cables. The screw has advantages of easy assembly and easy disassembly, so that it is applied to various fields. If the screw has the problems of no thread, cracking, size out-of-tolerance and the like, the installation and the use of a connector product can be seriously influenced, the conventional comprehensive detection method adopts a through-end thread gauge to detect the rotatability of the thread according to the Taylor containing principle, and a broken-stop thread gauge is used to detect the manufacturing deviation of a single thread; however, a single-term detection method is mainly adopted to analyze errors of all parameters and further control parameter indexes of threads, the main methods include a quantitative needle method, a double-ball method and the like, the detection of the single-term method is complex, various formulas are required to be calculated, the measurement efficiency is low, and the threads are used and hidden troubles exist.

Disclosure of Invention

The invention provides a high-efficiency thread on-off detection device and a detection method, aiming at solving the problem of low thread detection efficiency in the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the utility model provides a screw thread leads to and ends detection device, includes the workstation, the workstation on be equipped with the clamping mechanism who is used for pressing from both sides tight screw that awaits measuring, the workstation on still be equipped with the main camera of X direction, the main camera of X direction opposite be equipped with first board in a poor light, the workstation on still be equipped with the supplementary camera of Y direction, the opposite of the supplementary camera of Y direction be equipped with the second board in a poor light.

Furthermore, the clamping mechanism comprises V-shaped clamping cylinders on two sides, and the V-shaped clamping cylinders are clamped on the optical axis part of the screw.

The thread end-stop detection device of claim, wherein: and a proximity switch is arranged beside the V-shaped clamping cylinder.

A detection method of the thread on-off detection device comprises the following steps:

the method comprises the following steps: firstly, a screw is placed in the middle of a V-shaped block of a V-shaped clamping cylinder, and when a proximity switch senses the screw, the V-shaped clamping cylinder clamps the light cylinder part of the screw.

The method comprises the following steps: the X-direction main camera and the Y-direction auxiliary camera start shooting, the Y-direction auxiliary camera obtains a current thread center line, the X-direction camera obtains pictures of tooth profile, inner diameter and outer diameter, and the image simulation fitting double-needle method is adopted for the middle diameter.

The method comprises the following steps: and correcting to obtain correct numerical values of the tooth profile, the inner diameter, the outer diameter and the middle diameter by the deviation of the thread central line and the standard central line on the tooth profile corresponding to the measuring height, comparing with standard thread data, judging whether the error is within a tolerance allowable range, loosening the V-shaped clamping cylinder after the comparison judgment is finished, and taking out the screw.

Further, the data correction in the step is realized by: and multiplying the ratio of the deviation of the thread central line and the standard central line on the corresponding measuring height to the standard inner diameter, the standard outer diameter and the standard middle diameter by the measured inner diameter, the measured outer diameter and the standard middle diameter.

Has the advantages that: x, Y two cameras in the vertical direction are adopted to obtain and correct parameters such as screw tooth shapes and the like under the backlight condition, so that automatic image detection of threads is realized; the method adopts a simulated double-needle measurement method of adding tangent circles with fixed diameters to pictures obtained by an image sensor to obtain the pitch diameter size of the thread to be detected, and avoids manual detection errors.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic view of a thread stop detection device according to the present invention;

FIG. 2 is a schematic diagram of the detection of the present invention.

The system comprises a workbench, a main camera in the X direction, a first backlight plate, an auxiliary camera in the Y direction, a second backlight plate, a V-shaped clamping cylinder, a proximity switch, a screw, a first camera in the Y direction, a second camera in the Y direction, a third camera in the X direction, a fourth camera in the Y direction, a fifth camera in the Y direction, a sixth camera in the Y direction, a fifth camera.

Detailed Description

As shown in fig. 1, a thread passing and stopping detection device comprises a workbench 1, wherein a clamping mechanism for clamping a screw 8 to be detected is arranged on the workbench 1, an X-direction main camera 2 is further arranged on the workbench 1, a first backlight plate 3 is arranged opposite to the X-direction main camera 2, a Y-direction auxiliary camera 4 is further arranged on the workbench 1, and a second backlight plate 5 is arranged opposite to the Y-direction auxiliary camera 4.

The clamping mechanism comprises V-shaped clamping cylinders 6 on two sides, and the V-shaped clamping cylinders 6 are clamped on the optical axis part of the screw 8.

A proximity switch 7 is arranged beside the V-shaped clamping cylinder 6.

A detection method of the thread on-off detection device comprises the following steps:

step 1: firstly, the screw 8 is placed in the middle position of the V-shaped block of the V-shaped clamping cylinder 6, and after the proximity switch 7 senses the screw 8, the V-shaped clamping cylinder 6 clamps the light cylinder part of the screw 8.

Step 2: the X-direction main camera 2 and the Y-direction auxiliary camera 4 start shooting, the Y-direction auxiliary camera 4 obtains a current thread center line, the X-direction camera obtains tooth profile, inner diameter and outer diameter pictures, and the image simulation fitting double-needle method is adopted for the middle diameter.

And step 3: and correcting to obtain correct numerical values of the tooth profile, the inner diameter, the outer diameter and the middle diameter by the deviation of the thread central line and the standard central line on the tooth profile corresponding to the measuring height, comparing with standard thread data, judging whether the error is within a tolerance allowable range, loosening the V-shaped clamping cylinder 6 after the comparison judgment is finished, and taking out the screw 8.

As shown in fig. 2, the data rectification in step 3 is implemented as follows: and multiplying the ratio of the deviation of the thread central line and the standard central line on the corresponding measuring height to the standard inner diameter, the standard outer diameter and the standard middle diameter by the measured inner diameter, the measured outer diameter and the standard middle diameter.

It should be understood that the above-described specific embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Obvious variations or modifications which are within the spirit of the invention are possible within the scope of the invention.