Precise screw detection jig

Abstract

The utility model discloses a precise screw detection jig, particularly relates to the field of screw detection, and comprises a detection device, a carrying platform is arranged in the detection device, a detection jig is arranged on the surface of the carrying platform, and a bidirectional vision measuring instrument is arranged outside the detection jig. The bidirectional vision measuring instrument comprises vision imaging systems and telecentric light sources, the vision imaging systems are respectively arranged above and on the side wall of the detection jig, and the telecentric light sources are arranged in opposite directions of the two groups of vision imaging systems. The screw on the surface of the jig is photographed in a top view direction and a side view direction by utilizing a bidirectional visual inspection instrument, the outline dimension of the measured screw is obtained through an image processing algorithm, a corresponding operator is added, and the corresponding outline of the measured screw is grabbed, so that high-precision measurement data is obtained, and the efficiency and precision of screw detection are improved.

Description

Technical Field

[0001] The utility model relates to the field of screw detection, and more specifically, to a precise screw detection jig. Background Art

[0002] Screws are widely used fasteners in daily life and production. They come in a variety of sizes, including standard screws and non-standard, special-shaped screws that meet various special production and functional requirements. In order to use the correct screw specifications for fastening, it is necessary to measure the screw dimensions to determine whether they meet the design requirements and avoid potential production and assembly problems and component quality issues.

[0003] The common method of screw inspection is manual inspection using a caliper, micrometer or height gauge;

[0004] When manually using calipers and micrometers to inspect screws, the readings are usually different due to differences in each person's operation, resulting in greater precision errors. In addition, a screw needs to be inspected in multiple dimensions. Manual inspection with calipers requires measuring each dimension one by one, which is inefficient. Sometimes, in order to improve the accuracy of the inspection data, different people are required to inspect the same screw and take the average value. This inspection method is inefficient and has poor accuracy.

[0005] Therefore, in order to solve the above problems, a precise screw detection fixture is proposed. Utility Model Content

[0006] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a precise screw detection fixture to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a precision screw detection jig, comprising a detection device, characterized in that a loading platform is provided inside the detection device, a detection jig is provided on the surface of the loading platform, and a two-way visual measuring instrument is provided outside the detection jig, the two-way visual measuring instrument includes a visual imaging system and a telecentric light source, visual imaging systems are provided above and on the side walls of the detection jig, and telecentric light sources are provided in relative directions of the two sets of visual imaging systems, a thin sheet is provided inside the detection jig, and a circular hole is opened on the surface of the thin sheet, and a screw is provided inside the circular hole.

[0008] Preferably, the detection jig includes a jig seat, a square hole is provided in the middle portion of the jig seat, and a square groove is provided in the lower portion of the square hole and passes through the left and right sides, and the thin sheet is arranged inside the two groups of square grooves.

[0009] Preferably, two groups of pressure blocks 1 are fixedly arranged inside one of the square grooves opened in the jig seat, and one end of the thin sheet is fixedly arranged between the two groups of pressure blocks 1, and one group of pressure blocks 1 is movably arranged at the other end of the square groove, and pressure block 2 is fixedly arranged on the top of pressure block 1, and the other end of the thin sheet is fixedly arranged between pressure blocks 1 and 2.

[0010] Preferably, tensioning blocks are provided on both sides of the pressure block, a through hole is provided on the surface of the tensioning block, a guide pin is movably provided inside the through hole, and the guide pin is provided inside the square groove provided on the fixture seat.

[0011] Preferably, a movable groove is provided at one end of the pressing block away from the thin sheet, a threaded hole is provided on one side of the fixture seat, and a tensioning screw is threadedly connected inside the threaded hole, and one end of the tensioning screw is movably provided inside the movable groove.

[0012] Preferably, another set of threaded holes is opened on the top of the fixture seat, and the threaded holes are internally threadedly connected with locking screws, and the locking screws are arranged above the second pressing plate.

[0013] The technical effects and advantages of this utility model are:

[0014] Compared with the existing technology, the utility model places the inspection fixture loaded with screws on the loading platform surface of the two-way vision inspection instrument, uses the two-way vision inspection instrument to take pictures of the screws on the surface of the fixture from both the top and side views, obtains the outer contour dimensions of the screws being tested through the image processing algorithm, and adds the corresponding operator to capture the corresponding contour of the screws being tested, thereby obtaining high-precision measurement data and increasing the efficiency and accuracy of screw detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Figure 2 This is a schematic diagram of the screw detection principle of the utility model.

[0017] Figure 3 for Figure 1 A structural diagram from another perspective is shown.

[0018] Figure 4 This is a schematic diagram of the structure of the detection fixture of the utility model.

[0019] Figure 5 This is a front view of the detection fixture structure of the utility model.

[0020] Figure 6 This is a bottom view of the detection fixture structure of the utility model.

[0021] The accompanying drawings are marked as follows: 1. Detection equipment; 2. Loading platform; 3. Bidirectional visual measuring instrument; 4. Detection fixture; 5. Telecentric light source; 6. Visual imaging system; 7. Fixture seat; 8. Locking screw; 9. Tensioning screw; 10. Thin sheet; 11. Screw; 12. Pressure block 1; 13. Pressure block 2; 14. Tensioning block; 15. Guide pin. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Example 1

[0024] As attached Figure 1 、 Figure 2 and Figure 3 A precision screw detection fixture shown in the figure includes a detection device 1, a loading platform 2 is provided inside the detection device 1, a detection fixture 4 is provided on the surface of the loading platform 2, and a two-way visual measuring instrument 3 is provided outside the detection fixture 4. The two-way visual measuring instrument 3 includes a visual imaging system 6 and a telecentric light source 5. The visual imaging system 6 is provided above and on the side wall of the detection fixture 4, and the two groups of visual imaging systems 6 are provided with a telecentric light source 5 in opposite directions. A thin sheet 10 is provided inside the detection fixture 4, and a circular hole is opened on the surface of the thin sheet 10, and a screw 11 is provided inside the circular hole.

[0025] Among them: a two-way visual inspection instrument is used to take photos of the screw 11 on the surface of the fixture from both the top and side views. Through the image processing algorithm, the outer contour dimensions of the screw 11 under test are obtained, and the corresponding operator is added to capture the corresponding contour of the screw 11 under test, thereby obtaining high-precision measurement data and increasing the efficiency and accuracy of the screw 11 detection.

[0026] Example 2

[0027] Based on the first embodiment, the solution in the first embodiment is further detailed in combination with the following specific working methods, as described below:

[0028] like Figure 4 、 Figure 5 and Figure 6As shown, as a preferred embodiment; the detection jig 4 includes a jig seat 7, a square hole is opened in the middle part of the jig seat 7, and a square groove is opened in the lower part of the square hole to pass through the left and right sides, and the thin sheet 10 is arranged inside the two groups of square grooves. Furthermore, the thin sheet 10 is fixed by the square groove opened in the middle part of the jig seat 7 so that the screw 11 can be detected.

[0029] like Figure 4 、 Figure 5 and Figure 6 As shown, as a preferred embodiment; two groups of pressure blocks 12 are fixedly arranged inside one group of square grooves opened by the fixture seat 7, and one end of the thin film 10 is fixedly arranged between the two groups of pressure blocks 12, and a group of pressure blocks 12 is movably arranged at the other end of the square groove, and a pressure block 2 13 is fixed on the top of the pressure block 12, and the other end of the thin film 10 is fixed between the pressure blocks 12 and 13. Furthermore, one end of the thin film 10 is fixed by the two groups of pressure blocks 12, and the other end of the thin film 10 is fixed by using the pressure blocks 12 and 13. Since the pressure blocks 12 and 13 located inside the other group of square grooves are movably arranged inside the square grooves, the thin film 10 can be stretched to ensure that the thin film 10 is in a flat state.

[0030] like Figure 4 、 Figure 5 and Figure 6 As shown, as a preferred embodiment; tensioning blocks 14 are provided on both sides of the pressure block 2 13, a through hole is provided on the surface of the tensioning block 14, and a guide pin 15 is movably provided inside the through hole, and the guide pin 15 is provided inside the square groove opened by the fixture seat 7. Furthermore, the moving trajectory of the tensioning block 14 is fixed by the guide pin 15, and the moving trajectory of the pressure block 2 13 is fixed by the tensioning block 14.

[0031] like Figure 4 、 Figure 5 and Figure 6 As shown, as a preferred embodiment; a movable groove is provided at one end of the pressure block 2 13 away from the thin sheet 10, a threaded hole is opened on one side of the fixture seat 7, and a tensioning screw 9 is threadedly connected inside the threaded hole, and one end of the tensioning screw 9 is movably set inside the movable groove. Furthermore, the tensioning screw 9 is rotated to drive itself to move horizontally. Since the tensioning screw 9 is movably connected to the movable groove, when the tensioning screw 9 moves, it can drive the pressure block 2 13 to move. At the same time, the movable groove is movably connected to the tensioning screw 9, so that the rotation of the tensioning screw 9 will not be affected.

[0032] like Figure 4 、 Figure 5 and Figure 6As shown, as a preferred embodiment; another set of threaded holes is provided on the top of the fixture seat 7, and a locking screw 8 is threadedly connected to the inside of the threaded hole. The locking screw 8 is arranged above the second pressure plate. Furthermore, the locking screw 8 is threadedly connected to the threaded hole provided on the top of the fixture seat 7. When the locking screw 8 is rotated, it drives itself to move vertically. When the locking screw 8 is connected to the second pressure plate, the second pressure plate can be locked to ensure the position accuracy of the thin film 10.

[0033] The working process of this utility model is as follows:

[0034] When the utility model is used, the detection fixture 4 loaded with the screw 11 is placed on the surface of the loading platform 2 of the two-way visual inspection instrument, and the two-way visual inspection instrument is used to take pictures of the screw 11 on the surface of the fixture from both the top and side views. The outer contour dimensions of the screw 11 under test are obtained through the image processing algorithm, and the corresponding operator is added to capture the corresponding contour of the screw 11 under test, thereby obtaining high-precision measurement data, thereby increasing the efficiency and accuracy of the screw 11 detection;

[0035] The inspection fixture 4 loaded with the screw 11 is placed on the loading platform 2, and the surface of the loading platform 2 is made of transparent material. A two-way visual imaging system 6 is arranged above the platform, and a telecentric light source 5 coaxial with the imaging system is arranged below the platform. The telecentric light source 5 illuminates the bottom to obtain a clear radial plane profile such as the diameter of the screw head 11; another set of two-way visual imaging systems 6 is arranged on the right side of the platform, and another set of telecentric light sources 5 is arranged on the left side of the platform. The telecentric light source 5 illuminates, and the visual imaging system 6 on the right side obtains the length of the screw 11 being measured, the thickness of the screw 11 head, the axial profile data, the thread diameter, and the screw 11 head diameter data. Through the two vertical visual imaging systems 6, most of the external contour dimensions of the screw 11 being measured can be obtained, and the complete screw 11 image can be fitted through the image processing algorithm, which can meet most of the screw 11 size measurement requirements.

[0036] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense, and may refer to mechanical or electrical connections, internal communication between two components, or direct connection. "Up," "down," "left," and "right" are only used to indicate relative positional relationships. When the absolute positions of the objects being described change, the relative positional relationships may also change.

[0037] Secondly: The drawings of the embodiments disclosed in this utility model only involve structures related to the embodiments disclosed in this utility model. Other structures can refer to common designs. In the absence of conflicts, the same embodiment and different embodiments of the utility model can be combined with each other.

[0038] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A precision screw detection jig, comprising a detection device (1), characterized in that: The detection device (1) is provided with a loading platform (2) inside, a detection jig (4) is provided on the surface of the loading platform (2), and a bidirectional visual measuring instrument (3) is provided outside the detection jig (4), the bidirectional visual measuring instrument (3) includes a visual imaging system (6) and a telecentric light source (5), the visual imaging system (6) is provided above and on the side wall of the detection jig (4), and the two sets of visual imaging systems (6) are provided with a telecentric light source (5) in opposite directions, and a thin sheet (10) is provided inside the detection jig (4), and a circular hole is opened on the surface of the thin sheet (10), and a screw (11) is provided inside the circular hole.

2. A precision screw detection jig according to claim 1, characterized in that: The detection jig (4) comprises a jig seat (7), a square hole is provided in the middle portion of the jig seat (7), and a square groove is provided in the lower portion of the square hole and passes through the left and right sides, and the thin sheet (10) is arranged inside the two groups of square grooves.

3. A precision screw detection jig according to claim 2, characterized in that: Two groups of pressure blocks (12) are fixedly arranged inside one of the square grooves opened in the fixture seat (7), and one end of the thin sheet (10) is fixedly arranged between the two groups of pressure blocks (12). A group of pressure blocks (12) is movably arranged at the other end of the square groove, and a pressure block (13) is fixedly arranged on the top of the pressure block (12), and the other end of the thin sheet (10) is fixedly arranged between the pressure blocks (12) and the pressure blocks (13).

4. A precision screw detection jig according to claim 3, characterized in that: Tensioning blocks (14) are provided on both sides of the second pressure block (13), a through hole is provided on the surface of the tensioning block (14), a guide pin (15) is movably provided inside the through hole, and the guide pin (15) is provided inside the square groove provided on the fixture seat (7).

5. The precision screw detection jig according to claim 3, characterized in that: The second pressing block (13) is provided with a movable groove at one end away from the sheet (10), and a threaded hole is provided on one side of the fixture seat (7), and a tensioning screw (9) is threadedly connected inside the threaded hole, and one end of the tensioning screw (9) is movably arranged inside the movable groove.

6. A precision screw detection jig according to claim 2, characterized in that: Another set of threaded holes is provided at the top of the fixture seat (7), and a locking screw (8) is threadedly connected inside the threaded hole. The locking screw (8) is arranged above the second pressing plate.

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