CN209978819U

CN209978819U - Detection equipment and detection system

Info

Publication number: CN209978819U
Application number: CN201921217915.2U
Authority: CN
Inventors: 王亚辉; 王亚平
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-07-30
Filing date: 2019-07-30
Publication date: 2020-01-21
Anticipated expiration: 2029-07-30

Abstract

The utility model provides a check out test set and detecting system, relates to work piece size measurement technical field, check out test set includes: the device comprises a transparent objective table, a surface light source, a reflecting mechanism and an image acquisition mechanism; the transparent object stage is used for placing a workpiece to be detected; parallel light rays emitted by the surface light source are reflected by the reflecting mechanism and then emitted to the transparent object stage, and the parallel light rays penetrate through the transparent object stage and then are emitted to the direction of the image acquisition mechanism; the lens of the image acquisition mechanism faces the transparent objective table, and the image acquisition mechanism is used for acquiring the image of the workpiece to be detected placed on the transparent objective table. The application provides a check out test set is applied to detecting system, because the light that jets out through transparent objective table is the parallel light, consequently makes work piece edge region diffuse reflection reduce, and the ambiguity reduces, detects the precision and improves.

Description

Detection equipment and detection system

Technical Field

The utility model relates to a work piece size measurement field particularly, relates to a check out test set and detecting system.

Background

In the production link of workpieces, the measurement of the outer contour dimension of the workpieces is an important link, especially in the field of precision element processing. Currently, detection is generally performed using a detection device. Specifically, the detection device comprises an industrial camera and a control device, wherein the industrial camera acquires an image of a workpiece, and the control device calculates the size of the workpiece according to the image acquired by the industrial camera.

In order to improve the definition of an image acquired by an industrial camera, the detection equipment further comprises a light source, the light source is arranged below the workpiece and emits light rays, the light rays irradiate the workpiece to be detected, the workpiece shields part of the light rays, and part of the light rays are emitted into the industrial camera, so that the contrast between the light and the shade of the image acquired by the camera is strong, and the industrial camera forms image acquisition according to a shadow area for a control device to perform size calculation.

However, in the image acquired by the detection equipment in the prior art, the outline edge area of the workpiece is fuzzy, which affects the detection precision.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a check out test set and detecting system, it can provide luminance uniform light, improves and detects the precision.

The embodiment of the utility model is realized like this:

a detection apparatus, comprising: the device comprises a transparent objective table, a surface light source, a reflecting mechanism and an image acquisition mechanism;

the transparent object stage is used for placing a workpiece to be detected;

parallel light rays emitted by the surface light source are reflected by the reflecting mechanism and then emitted to the transparent object stage, and the parallel light rays penetrate through the transparent object stage and then are emitted to the direction of the image acquisition mechanism;

the lens of the image acquisition mechanism faces the transparent objective table, and the image acquisition mechanism is used for acquiring the image of the workpiece to be detected placed on the transparent objective table.

In a preferred embodiment of the present invention, the reflecting mechanism comprises a reflector, the transparent stage is parallel to the horizontal plane, the surface light source is perpendicular to the horizontal plane, and the included angle between the reflector and the horizontal plane is 45 °.

In a preferred embodiment of the present invention, the reflecting mechanism includes a plurality of reflecting mirrors, and the reflecting mirrors are spaced apart from the surface light source and the stage.

In the preferred embodiment of the present invention, the image capturing mechanism includes an industrial camera and a telecentric lens, and the telecentric lens is installed at the lens of the industrial camera.

In the preferred embodiment of the present invention, the telecentric lens is a double telecentric lens.

In the preferred embodiment of the present invention, the present invention further comprises a housing, the transparent stage is installed outside the housing, the surface light source, the reflection mechanism, the image capturing mechanism are installed inside the housing, and the lens of the image capturing mechanism is exposed out of the housing and opposite to the transparent stage.

In the preferred embodiment of the present invention, a light path channel is formed in the housing, and the reflection mechanism and the surface light source are both installed in the light path channel.

In the preferred embodiment of the present invention, the detection device further comprises a display, and the display is used for displaying the image collected by the image collecting mechanism, and/or displaying the size data of the workpiece to be detected.

In a preferred embodiment of the present invention, the transparent stage includes a positioning frame and a glass plate installed in the positioning frame.

A detection system comprising the detection apparatus of any of the above claims.

The utility model provides a check out test set's beneficial effect is: the detection device is used for detecting the size of the workpiece, such as the length, width, aperture and the like of the workpiece. In the specific operation process, a workpiece is placed on the transparent objective table and is positioned between the transparent objective table and the image acquisition mechanism. Start the area source, the light that the area source sent is by the transparent objective table of directive after the reflection of reflection mechanism, after seeing through transparent objective table, partial light is sheltered from by the work piece, and the parallel image acquisition mechanism that jets into of partial light to make image acquisition mechanism receive the parallel light who sees through transparent objective table, with the strong image of light and shade contrast of gathering. Because the light received by the image acquisition mechanism is parallel light, the edge blurring condition caused by diffuse reflection generated at the edge of the workpiece is reduced, the definition of the edge of the image acquired by the image acquisition mechanism is improved, and the detection precision of the detection equipment is further improved.

Because the reflection mechanism is arranged, the length of the light path is increased under the condition that the height of the detection equipment is not changed, the messy light in the light is reduced, the proportion of parallel light in the light which finally exits the transparent objective table is improved, and the detection precision of the detection equipment is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a detection apparatus provided in an embodiment of the present invention;

fig. 2 is a schematic view of an internal structure of the detection apparatus provided in the embodiment of the present invention;

fig. 3 is a schematic diagram of an optical path of the detection apparatus provided in the embodiment of the present invention during the operation process;

fig. 4 is a schematic optical path diagram of another detection apparatus provided in an embodiment of the present invention during a working process.

In the figure:

10-a housing; 11-a base plate; 12-a switch; 13-a first channel; 14-a second channel; 21-an industrial camera; 22-double telecentric lens; 30-a transparent stage; 31-a glass plate; 32-positioning the frame; 40-a mirror; 50-area light source; 60-a display; 70-the workpiece to be tested.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the products of the present invention are usually placed when in use, and are only for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the detecting device or element that is referred to must have a specific position, be constructed and operated in a specific position, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

First embodiment

Referring to fig. 1 to 4, the present embodiment provides a detection apparatus, including: a transparent object stage 30, a surface light source 50, a reflecting mechanism and an image collecting mechanism; wherein:

the transparent object stage 30 is arranged opposite to the image acquisition mechanism, the lens of the image acquisition mechanism faces the transparent object stage 30, and the image acquisition mechanism is used for acquiring the image of the workpiece 70 to be measured placed on the transparent object stage 30.

The parallel light emitted from the surface light source 50 is reflected by the reflection mechanism and then emitted to the transparent stage, and the parallel light is emitted to the direction of the lens of the image capturing mechanism after passing through the transparent stage 30.

When carrying out work piece size measurement, will be surveyed work piece 70 and place on transparent objective table 30, open area light source 50, the light that area light source 50 sent is reflected the back directive transparent objective table 30 by reflection mechanism, after seeing through transparent objective table 30, partial light is sheltered from by being surveyed work piece 70, and partial light is parallel to be shone into image acquisition mechanism to make image acquisition mechanism receive the parallel light who sees through transparent objective table 30, with the strong image of gathering light and shade contrast.

Since the farther the distance between the surface light source 50 and the transparent stage 30 is, the longer the optical path distance is, the less the stray light contained in the light beam is, the more the light beam tends to be completely parallel, the more accurate and clear the image formation is, and the higher the detection accuracy is. Therefore, since the reflection mechanism is provided, the reflection mechanism can reflect the light emitted from the surface light source 50, that is, the reflection mechanism is used, so that the surface light source 50, the transparent stage 30 and the image collecting mechanism do not need to be on the same straight line, and further, when the height of the detection device is equal, in the detection device using the reflection mechanism, the optical path distance of the light emitted from the surface light source 50 is longer, so that the stray light contained in the light emitted from the surface light source 50 is less, the light tends to be completely parallel, the more accurate and clear the imaging is, and the higher the detection precision is.

The reflection mechanism includes at least one mirror 40, and specifically, the reflection mechanism may include only one mirror 40, or may include a plurality of mirrors 40.

For example, as shown in fig. 2 and 3, in one embodiment of the present embodiment, the reflecting mechanism includes a reflector 40, the transparent stage 30 is parallel to the horizontal plane, the surface light source 50 is perpendicular to the horizontal plane, and the angle between the reflector 40 and the horizontal plane is 45 °. The direction of the arrow in fig. 3 is the light path. In the orientation shown in fig. 3, the reflector 40 is located in the area below the transparent stage 30, and the light emitted from the surface light source 50 horizontally reaches the reflector 40 to the right, and is vertically irradiated upwards by the reflection of the reflector 40, so as to penetrate through the transparent stage 30 located above the reflector 40 and enter the image capturing mechanism.

In the preferred embodiment of the present invention, the reflecting mechanism includes a plurality of reflecting mirrors 40, and the plurality of reflecting mirrors 40 are spaced between the surface light source 50 and the stage. The light emitted from the surface light source 50 is reflected by the respective reflectors 40 in sequence, and finally emitted toward the transparent stage 30.

In a preferred embodiment of the present embodiment, the detection apparatus further includes a housing 10, the display 60 and the transparent stage 30 are both mounted outside the housing 10, the surface light source 50, the reflection mechanism, and the image capturing mechanism are all mounted inside the housing 10, and the lens of the image capturing mechanism is exposed out of the housing 10 and is opposite to the stage.

Specifically, a light path channel is formed in the housing 10, and light emitted from the surface light source 50 propagates along the light path channel and is horizontally emitted from the light path channel toward the transparent stage 30. As shown in fig. 2, the housing 10 includes a bottom plate 11 and a cover (the cover is not shown in fig. 2 for clearly seeing the internal structure of the housing 10), and a cavity is formed between the bottom plate 11 and the cover for mounting the surface light source 50, the reflection mechanism and the image capturing mechanism, wherein the image capturing mechanism is mounted on the upper region of the cover, and the reflection mechanism is mounted in the optical path. The display 60 is mounted outside the housing and the processor may be mounted inside the housing or may be integrated into the display 60.

As shown in fig. 2 and 3, when the reflecting mechanism includes one reflecting mirror 40, the optical path passage is located in the lower region of the housing 10, and the optical path passage is a horizontally arranged linear passage, the surface light source 50 is located at one side of the optical path passage, the reflecting mirror 40 is located at the other side of the optical path passage, and the reflecting mirror 40 is located below the transparent stage 30. Specifically, the reflecting mirror 40 includes a plane mirror and a mirror frame, the plane mirror is installed in the mirror frame, and the mirror frame is fixed to the inner side of the cover or the bottom plate 11, or the mirror frame is connected to both the inner side of the cover and the bottom plate 11.

When the number of the reflecting mirrors 40 is plural, the optical path channel is a bent channel, the bent channel includes a plurality of linear channels which are communicated with each other, and two adjacent linear channels are arranged in a relatively inclined manner. The surface light source 50 is disposed at one end of the meandering channel, one of the reflecting mirrors 40 is disposed at the other end of the meandering channel, and further, one reflecting mirror 40 is disposed at each of junctions of two adjacent straight channels.

As shown in fig. 4, in one embodiment, when the number of the reflecting mirrors 40 is two, the optical path channel includes two linear channels, the two linear channels are perpendicular to each other, for convenience of description, the longitudinally extending linear channel is referred to as a first channel 13, the transversely extending linear channel is referred to as a second channel 14, and the first channel 13 and the second channel 14 are perpendicular to each other and communicate with each other. The surface light source 50 is arranged at the upper end of the first channel 13, the surface light source 50 is perpendicular to the extending direction of the first channel 13, the first reflector 40 is located in a communication intersection area of the first channel 13 and the second channel 14, an included angle between the extending directions of the first reflector 40 and the first channel 13 is 45 degrees, an included angle between the extending directions of the first reflector 40 and the second channel 14 is 45 degrees, the second reflector 40 is located at one end, far away from the first channel 13, of the second channel 14, and an included angle between the extending directions of the second reflector 40 and the second channel 14 is 45 degrees. With this arrangement, the light emitted from the surface light source 50 first reaches the first reflector 40 along the first channel 13, then enters the second channel 14 after being deflected by a reflection angle of 90 ° at the first reflector 40, and then reaches the second reflector 40 along the second channel 14, and then exits the light path channel after being deflected by a reflection angle of 90 ° at the second reflector 40, and finally exits the light path channel toward the transparent stage 30.

While fig. 4 above includes straight channels extending longitudinally, in another embodiment, the straight channels may extend horizontally, i.e. all of the straight channels have a side wall formed by the bottom plate 11. So set up, the axis of adjacent straight-line passageway all is located same horizontal plane, and the axis of adjacent straight-line passageway is crossing.

When the number of the reflectors 40 is larger, the arrangement of the optical path is similar to the design of one or two reflectors 40, and can be specifically set according to the specific number of the reflectors 40 and the specific shape and size of the housing 10.

As shown in fig. 1 and 2, the transparent stage 30 includes a positioning frame 32 and a glass plate 31 installed in the positioning frame 32. The glass plate 31 is used for placing the workpiece 70 to be tested, the glass plate 31 is installed in the positioning frame 32, and the positioning frame 32 is connected with the shell 10. Specifically, the housing 10 is provided with an object stage mounting plate, the object stage mounting plate is located on the cover body, the object stage mounting plate is provided with a through hole, the glass plate 31 corresponds to the through hole, and light rays are emitted from the through hole and then penetrate through the glass plate 31. After the transparent stage 30 is mounted to the stage mounting plate, the top plate of the glass plate 31 may be flush with the top surface of the stage mounting plate, or the top surface of the glass plate 31 may be higher than the top surface of the stage mounting plate (as shown in fig. 1).

In a specific embodiment of this embodiment, the detection apparatus further includes a display 60, and the display can be used for displaying the image captured by the image capturing mechanism, or displaying the size information of the workpiece 70 to be detected, or displaying the image and the size information at the same time. In addition, the display can also display whether the size of the workpiece 70 to be tested meets the standard.

In one embodiment, the image capture mechanism is electrically connected to the processor. The processor is used for processing the image acquired by the image acquisition mechanism and obtaining the size data of the workpiece 70 to be measured, wherein the size data includes but is not limited to length, width, aperture and pitch. In the detection device provided by the application, the processor can be a CPU or the like. The program used in the CPU is the same as that used in the prior art test device.

In a preferred embodiment of this embodiment, the display 60 includes a touch screen, and information can be input through the touch screen, for example, a standard dimension value (a standard dimension value range may be a specific value or a numerical value range) is input, when the detection device works, the dimension of the workpiece 70 to be measured is measured and then compared with the corresponding standard dimension value, and if the dimension of the workpiece 70 to be measured meets the standard dimension value, the "OK" is displayed while the dimension data is displayed on the display screen; if the dimension of the workpiece 70 to be measured meets the dimension standard value, "NG" is displayed while the dimension data is displayed on the display screen. With such an arrangement, while the size of the workpiece 70 to be tested is detected, it can also be detected whether the size of the workpiece 70 to be tested meets the standard, and even used for counting the production yield of a batch of workpieces 70 to be tested.

In the preferred embodiment of the present invention, the housing 10 is provided with a switch 12, the switch 12 is connected to the surface light source 50 and the processor, and the switch 12 is used for controlling the surface light source 50 and the processor to start the detection operation.

Specifically, the switch 12 may be connected to the surface light source 50 and the processor, respectively, and when the switch 12 is pressed, the surface light source 50 is activated and the processor controls the industrial camera 21 to be activated, thereby performing a measurement operation. Alternatively, the switch 12 may be connected to a processor, which is connected to the surface light source 50, and when the switch 12 is pressed, the processor controls the surface light source 50 and the industrial camera 21 to be activated.

In one embodiment of the present embodiment, the image capturing mechanism may only include the industrial camera 21, and the industrial camera 21 is connected to the processor. Specifically, the industrial camera 21 may be a CCD (charge coupled device) camera or a CMOS (complementary metal oxide semiconductor) camera.

Alternatively, in a preferred embodiment of the present embodiment, the image capturing mechanism includes an industrial camera 21 and a telecentric lens mounted at the lens of the industrial camera 21. The telecentric lens has high resolution and low distortion, and has a parallel light design, so that the inconsistency of magnification caused by the inconsistency of the distance between the workpiece 70 to be detected and the lens can be eliminated, the parallax of the traditional industrial lens can be corrected, and the detection precision is further improved.

The telecentric lens includes an image-side telecentric lens, an object-side telecentric lens and a double telecentric lens 22 (or called as a bilateral telecentric lens).

In the present embodiment, the telecentric lens is preferably a double telecentric lens 22. The double telecentric lens 22 has the following advantages: the method has the advantages of no perspective error, nearly zero distortion, high resolution, long depth of field and more accurate and consistent amplification rate.

With the detection device, one or more workpieces can be subjected to size measurement in one detection process. In the process of multiple measurements, the repeated precision of detection reaches 0.002 mm.

In the above-described inspection apparatus, the surface light source 50 and the mechanism are combined to make the luminance uniform at any position in the illumination region.

In the detection apparatus provided in this embodiment, the planar light source 50 is adopted to emit parallel light, and the reflection is performed by the planar reflector 40, and compared with the mode that the point light source is adopted to emit light, and the parabolic reflection is used to convert the light into the parallel light, the parallel light source reflected by the parabolic surface cannot reach the light intensity consistency at any position in the irradiation area, specifically, the light intensity is weaker in the edge area of the irradiation area, and the light intensity is stronger in the middle area of the irradiation area. In practical applications, a point light source (e.g., a bulb) cannot be made infinitely small, and must have a certain diameter, which affects the quality of parallel light. Furthermore, the point light source (e.g., a bulb) is directed toward the side of the illumination surface (i.e., the side facing away from the parabolic reflective surface), and the light is emitted directly from the point light source without being reflected, and thus is scattered light.

In the detection device provided in this embodiment, the surface light source 50 directly emits uniform planar light (including the parallel light portion and the scattered light portion), and the light intensity is not reduced or enhanced during the reflection of the parallel light portion by the planar reflector 40, so that the light intensity at any position of the irradiation region is uniform. The scattered light portion is weakened by the longer distance between the light source and the reflector. In addition, because the plane mirror 40 is located the light-emitting side of the surface light source 50, the parallel light rays emitted by the surface light source 50 are all reflected by the mirror 40, and the highly parallel uniform light rays obtained at the measured object are compared with the expensive paraboloid-reflected device, so that the light intensity of the detection device provided by the embodiment is more uniform, the measurement precision is higher, and the cost is lower.

Second embodiment

The present embodiment provides a detection system, which includes the detection apparatus provided in the first embodiment, where the detection apparatus is used to detect the size of a workpiece, specifically, the size may be the length, width, aperture, pitch, and the like of the workpiece. Further, the inspection system may also include other inspection devices, such as devices for inspecting data such as thickness of the workpiece, curvature of the top surface of the workpiece, etc.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A detection apparatus, comprising: the device comprises a transparent objective table, a surface light source, a reflecting mechanism and an image acquisition mechanism;

the transparent object stage is used for placing a workpiece to be detected;

2. The inspection apparatus of claim 1, wherein the reflecting mechanism comprises a mirror, the transparent stage is parallel to a horizontal plane, the surface light source is perpendicular to the horizontal plane, and the mirror forms an angle of 45 ° with the horizontal plane.

3. The apparatus of claim 1, wherein the reflecting mechanism comprises a plurality of mirrors spaced between the surface light source and the stage.

4. The inspection apparatus of claim 1, wherein the image acquisition mechanism includes an industrial camera and a telecentric lens mounted at a lens of the industrial camera.

5. The inspection apparatus of claim 4, wherein the telecentric lens is a double telecentric lens.

6. The inspection apparatus according to claim 1, further comprising a housing, wherein the transparent stage is mounted outside the housing, the surface light source, the reflection mechanism, and the image capturing mechanism are mounted inside the housing, and a lens of the image capturing mechanism is exposed from the housing and is opposite to the transparent stage.

7. The apparatus according to claim 6, wherein an optical path passage is formed in the housing, and the reflection mechanism and the surface light source are mounted in the optical path passage.

8. The inspection apparatus of claim 1, further comprising a display for displaying the image captured by the image capturing mechanism and/or displaying dimensional data of the workpiece under test.

9. The inspection apparatus of claim 1, wherein the transparent stage includes a positioning bezel and a glass plate mounted within the positioning bezel.

10. A test system, characterized in that it comprises a test device according to any one of claims 1-9.