Hole pin part measuring device and hole pin part measuring method

Abstract

The present invention provides a hole pin part measuring device, which includes a measuring platform for placing hole pin parts, at least two groups of camera components facing the measuring platform, and a rotating motor for driving the measuring platform to rotate, each of the camera components includes an optical camera and a distance measurement module, and at least two groups of camera components have different axial angles with the measuring platform. After the hole pin part measuring device of the present invention performs spatial three-dimensional measurement of the hole pin features of all hole pin parts through the camera component, the optimal matching result is automatically extracted from the measured database. The hole pin part measuring device is easy to operate and does not require excessive manual intervention, which can greatly improve assembly efficiency, optimize work flow, and reduce scrap rate.

Description

Technical Field

[0001] The invention relates to a hole pin part measuring device and a hole pin part measuring method. Background Art

[0002] Pin assembly plays an important role in the assembly process of spare parts. As the number of pins and holes in parts increases, even if the error of each pair of pins and holes is within the tolerance range, the continuous accumulation of the dimension chain will make it difficult for spare parts to be installed in place during the overall installation process. At present, this problem is usually solved on-site by the installation master, which leads to low installation efficiency and is prone to damage to parts during the fitting process. In recent years, a lot of research on assisted assembly based on augmented reality technology has been carried out, but it usually only uses AR equipment to demonstrate the virtual assembly process, and does not really realize the measurement of different part features. Therefore, it cannot guide assembly employees to perform front-line operations and can only be used as a teaching demonstration.

[0003] In view of this, it is necessary to improve the existing assembly method to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a hole pin part measuring device to solve the problems of low installation efficiency and easy damage to parts of existing hole pin parts.

[0005] To achieve the above-mentioned purpose, the present invention provides a hole pin part measuring device, which includes a measuring platform for placing hole pin parts, at least two groups of camera components facing the measuring platform, and a rotating motor for driving the measuring platform to rotate, each of the camera components includes an optical camera and a ranging module, and at least two groups of the camera components have different angles with the axial direction of the measuring platform.

[0006] As a further improvement of the present invention, the hole pin part measuring device also includes a platform bracket for accommodating the measuring platform, and a bearing groove arranged in the platform bracket for allowing the measuring platform to rotate, and a bearing is arranged in the bearing groove.

[0007] As a further improvement of the present invention, the hole pin part measuring device also includes a plurality of support rods arranged below the platform bracket for supporting the platform bracket, and the support rods are telescopically adjustable along the vertical direction.

[0008] As a further improvement of the present invention, the hole pin part measuring device also includes a plurality of support bases for accommodating and supporting a plurality of the support rods, and a support motor for driving the support rods to extend and retract is disposed in the support bases.

[0009] As a further improvement of the present invention, a plurality of screw holes are provided on the measuring platform for fixing the hole pin parts.

[0010] As a further improvement of the present invention, the hole pin part measuring device also includes a platform controller electrically connected to the support motor to control the extension and contraction of the plurality of support rods and the rotation of the measuring platform.

[0011] As a further improvement of the present invention, the hole pin part measuring device also includes a system controller and a display electrically connected to the system controller, and the system controller is electrically connected to at least two of the camera components.

[0012] As a further improvement of the present invention, the hole pin part measuring device also includes a calibration plate, and a plurality of holes with different apertures are formed on the calibration plate.

[0013] As a further improvement of the present invention, the axes of each group of the camera assemblies form a certain angle with the plane where the measuring platform is located, and the angles between the axes of each group of the camera assemblies are not less than 15°.

[0014] The present invention also provides a hole pin part measuring method, the hole pin part measuring method comprising the following steps:

[0015] S1: Provide the hole pin part measuring device as described above;

[0016] S2: fixing the calibration plate on the measuring platform, controlling the rotary motor to drive the measuring platform to rotate, and at least two groups of camera assemblies measuring the size of the hole on the calibration plate;

[0017] S3: Control the extension and retraction of the support rod to control the measuring platform to be at different heights, repeat step S2, obtain the measurement result of the hole on the calibration plate, compare the measurement result with the actual size of the hole on the calibration plate, obtain the measurement error, calibrate different camera components, and automatically change the recognition parameters in the system controller;

[0018] S4: providing a hole pin part, recording the number of holes and pins on the hole pin part, and placing the hole pin part on the measuring platform;

[0019] S5: At least two groups of the camera assemblies detect the number of holes and pins on the hole pin part. If the number of hole pins detected is the same as the actual number of hole pins of the hole pin part, proceed to step S6. If they are different, the height of the measuring platform is changed by controlling the extension and retraction amount of the support rod, and the angle of the measuring platform is controlled by controlling the rotation of the measuring platform driven by the rotary motor, and re-measurement is performed until the number of hole pins detected is the same as the actual number of hole pins of the hole pin part.

[0020] S6: Calculate the coordinates and diameter of each hole pin feature on the hole pin part in three-dimensional space.

[0021] The beneficial effects of the present invention are as follows: after the hole pin parts measuring device and hole pin parts measuring method of the present invention perform spatial three-dimensional measurement of the hole pin features of all hole pin parts through the camera assembly, the optimal matching result is automatically extracted from the measured database. The hole pin parts measuring device is easy to operate, does not require excessive manual intervention, can greatly improve assembly efficiency, optimize work flow, and reduce scrap rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a hole pin part measuring device of the present invention;

[0023] Figure 2 It is a structural schematic diagram of a calibration plate of a hole pin part measuring device of the present invention. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] like Figure 1 to Figure 2As shown, the hole pin part measuring device 100 of the present invention includes a measuring platform 1 for placing hole pin parts, at least two groups of camera components 2 facing the measuring platform 1, a rotating motor 3 for driving the measuring platform 1 to rotate, a platform bracket 4 for accommodating the measuring platform 1, a bearing groove 5 arranged in the platform bracket 4 for the rotation of the measuring platform 1, a plurality of support rods 6 arranged under the platform bracket 4 for supporting the platform bracket 4, a plurality of support bases 7 for accommodating and supporting the plurality of support rods 6, a platform controller 8, a system controller 9, a display 10 electrically connected to the system controller 9, and a calibration plate 11.

[0028] The measuring platform 1 is connected to the platform bracket 4 via the bearing groove 5. A ball bearing is arranged in the bearing groove 5. The measuring platform 1 can be rotated by the rotating motor 3. The measuring platform 1 is used to place the hole pin parts.

[0029] The measuring platform 1 is provided with a plurality of screw holes for fixing the pin parts. The screw holes are M6 screw holes, and the hole spacing between adjacent screw holes is 25 mm, which are used to fix different pin parts and their fixtures. The diameter D of the measuring platform 1 is 1 meter or 1.5 meters.

[0030] The rotating motor 3 is driven by a three-phase hybrid stepping motor or other motor devices with similar functions. The measuring platform 1 rotates, and the rotating motor 3 has a rotation accuracy of not less than 0.1°. The rotating motor 3 usually runs at a constant speed, and the speed is not more than 5° / s.

[0031] The support rod 6 can be telescopically adjusted in the vertical direction. In this embodiment, three support rods 6 are evenly arranged at the bottom of the platform bracket 4, and the platform bracket 4 and the support rods 6 are connected by hinges.

[0032] The support rod 6 is connected to the support base 7, and a support motor is installed in the support base 7 to drive the extension and contraction of the support rod 6 and the rotation of the measuring platform. The support motors and the rotating motor 3 of the three support bases 7 are all connected to the platform controller 8. The support motors in the three support bases 7 can be controlled separately. If the extension and contraction amounts of the support rods 6 of the three support bases 7 are consistent, the measuring platform 1 is horizontal in the vertical direction. If the extension and contraction amounts of the support rods 6 of the three support bases 7 are inconsistent, the measuring platform 1 is tilted.

[0033] The support motor of each support base 7 controls the extension and retraction range H of the support rod 6 to be 0.1D.

[0034] The platform controller 8 is arranged on the side of the platform bracket 4, and is used to adjust the extension amount of the support rod 6 and the rotation angle of the rotary motor 3. The platform controller 8 is connected to the system controller 9 by wireless means, and the platform controller 8 receives the control instruction of the system controller 9 for adjustment.

[0035] At least two groups of the camera components 2 have different axial angles with the measuring platform 1. The axis of each group of the camera components 2 is at a certain angle to the plane where the measuring platform 1 is located, and the angle between the two is not less than 15°. In this embodiment, the number of the camera components 2 is four. In order to adapt to the hole features of different orientations in the parts, the four camera components 2 are dispersed in a vertical plane F. The axis of the four camera components 2 is 30°, 45°, 60° and 90° to the plane where the measuring platform 1 is located. The camera component 2 adjusts the distance from the measuring platform 1 according to the size of the hole pin part, and the distance is 0.6D.

[0036] Each of the camera assemblies 2 includes an optical camera 21 and a distance measurement module 22. The optical camera 21 is an optical industrial camera with a pixel count of not less than 50 million. The distance measurement module 22 is a laser distance measurement module 22 with a measurement accuracy of 5 microns. The optical cameras 21 and distance measurement modules 22 of the four camera assemblies 2 are arranged side by side, facing the center position of the measuring platform 1 when it is at the lowest position.

[0037] The optical camera 21 has a viewing angle of about 10°, so the camera assembly 2 only recognizes and measures hole features within a range of 5° around the vertical plane. Therefore, to recognize complete hole features, the measuring platform 1 needs to rotate one full circle.

[0038] The calibration plate 11 is provided with a plurality of holes with different apertures. The calibration plate 11 is a disc structure with a thickness of 2 cm and a diameter of 0.8D.

[0039] The main feature of the invention is that the centers of the plurality of holes are located on two circles spaced apart in the radial direction.

[0040] In one embodiment, the size of the hole pin part to be measured is about 30cm*30cm*30cm, and the average size of the hole pin is 4mm-16mm. The calibration plate 11 is provided with 4 holes on each circumference, of which the outer side is a large circular hole and the inner side is a small circular hole. The diameter of each large circular hole is different, which are 10mm, 12mm, 14mm, and 16mm respectively; the diameter of each small circular hole is different, which are 4mm, 5mm, 6mm, and 8mm respectively, and the distance between the two circumferences is 20cm. The calibration effect can be improved by different apertures. The calibration plate 11 is detachably mounted on the measuring platform 1, and different calibration plates 11 can also be selected according to the different hole pin parts to be measured.

[0041] In another embodiment, in one embodiment, the size of the hole pin part to be measured is about 110cm*40cm*20cm, the average size of the hole pin is 4mm-30mm, and 6 holes are arranged on each concentric circle of the calibration plate 11, of which the outer side is a large circular hole and the inner side is a small circular hole. The diameter of each large circular hole is different, and they are 10mm, 15mm, 18mm, 20mm, 25mm, and 30mm respectively; the diameter of each small circular hole is different, and they are 4mm, 5mm, 6mm, 7mm, 8mm, and 9mm respectively, and the distance between the two circumferences is 40cm.

[0042] The camera assembly 2 is electrically connected to the system controller 9 via a network cable to ensure the quality and speed of image transmission. In the system controller 9, the opencv program is used to process the pictures taken by the optical camera 21 in the camera assembly 2, identify the hole features and pin features, and measure based on the pixels of the image. At the same time, the distance information measured by the distance measurement module 22 and the current angle information fed back by the rotating motor 3 are combined to perform three-dimensional space calculations on each hole pin feature on the hole pin part, and finally the coordinates and diameter size of each hole pin feature in three-dimensional space on each measured part are obtained. This information is stored in the database in the system controller 9. After all the hole pin parts that need to be matched are measured, the display 10 on the system controller 9 will give the optimal parts list of the hole pin feature three-dimensional space information matching. The assembly staff can collect the corresponding hole pin parts for assembly through the given parts list, which can effectively improve the assembly efficiency.

[0043] The hole pin part measuring method of the present invention comprises the following steps:

[0044] S1: Provide the hole pin part measuring device 100 as described above;

[0045] S2: fixing the calibration plate 11 on the measuring platform 1, controlling the rotary motor 3 to drive the measuring platform 1 to rotate, and at least two groups of the camera assemblies 2 to measure the size of the hole on the calibration plate 11;

[0046] S3: Control the extension and retraction of the support rod 6 to control the measuring platform 1 to be at different heights, repeat step S2, obtain the measurement result of the hole on the calibration plate 11, compare the measurement result with the actual size of the hole on the calibration plate 11, obtain the measurement error, calibrate different camera components 2, and automatically change the recognition parameters in the system controller;

[0047] In step S3, the telescopic height of the support rod 6 is controlled to be 0, 0.5H and H, and the measuring platform 1 and the calibration plate 11 are in a horizontal state, with only a difference in height; since the diameter of the hole in the calibration plate 11 and the distance between the circumferences are known. By comparing the measured value with the standard value, the measurement error is obtained, and the measurement results of different cameras are calibrated by giving a calibration coefficient;

[0048] S4: providing a hole pin part, recording the number of holes and pins on the hole pin part, and placing the hole pin part on the measuring platform 1;

[0049] S5: At least two groups of the camera components 2 detect the number of holes and pins on the hole pin part. If the number of hole pins detected is the same as the actual number of hole pins of the hole pin part, then go to step S6. If they are different, the height of the measuring platform 1 is changed by controlling the extension and contraction amount of the support rod 6, and the angle of the measuring platform 1 is controlled by controlling the rotation motor 3 to drive the rotation of the measuring platform 1, and re-measure until the number of hole pins detected is the same as the actual number of hole pins of the hole pin part; during the detection, the measuring platform 1 needs to be rotated one circle;

[0050] S6: Calculate the coordinates and diameter of each hole pin feature on the hole pin part in three-dimensional space.

[0051] Finally, the display 10 on the system controller 9 will provide a parts list that matches the optimal three-dimensional spatial information of the hole pin feature. The assembly staff can collect the corresponding hole pin parts for assembly through the given parts list, which can effectively improve the assembly efficiency.

[0052] The hole pin part measuring device 100 and hole pin part measuring method of the present invention automatically extract the best matching result from the measured database after the hole pin features of all hole pin parts are measured in three dimensions through the camera assembly 2. The hole pin part measuring device 100 is easy to operate and does not require much manual intervention. By calibrating the camera assembly 2, it can be applied to the measurement of hole pin features in different parts. The device not only gives the size of each hole pin feature but also gives the three-dimensional spatial relationship of each hole pin feature, which is of great help to the assembly of parts with complex multi-hole pins, and can greatly improve assembly efficiency, optimize work flow, and reduce scrap rate.

[0053] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A hole pin part measuring device, characterized in that: The hole pin part measuring device includes a measuring platform for placing hole pin parts, at least two groups of camera assemblies facing the measuring platform, a rotating motor for driving the measuring platform to rotate, a calibration plate, a platform bracket for accommodating the measuring platform, a bearing groove arranged in the platform bracket for the rotation of the measuring platform, and a plurality of support rods arranged below the platform bracket for supporting the platform bracket. Each of the camera assemblies includes an optical camera and a ranging module. At least two groups of the camera assemblies have different axial angles with the measuring platform. The calibration plate is detachably mounted on the measuring platform. A plurality of holes with different apertures are provided on the calibration plate. A bearing is provided in the bearing groove. The support rod is telescopically adjustable in the vertical direction.

2. The hole pin part measuring device according to claim 1 is characterized in that: The hole pin part measuring device also includes a plurality of support bases for accommodating and supporting a plurality of the support rods, and a support motor for driving the support rods to extend and retract is arranged in the support bases.

3. The hole pin part measuring device according to claim 2 is characterized in that: The measuring platform is provided with a plurality of screw holes for fixing the hole pin parts.

4. The hole pin part measuring device according to claim 2 is characterized in that: The hole pin part measuring device also includes a platform controller electrically connected to the support motor to control the extension and contraction of the plurality of support rods and the rotation of the measuring platform.

5. The hole pin part measuring device according to claim 1 is characterized in that: The hole pin part measuring device also includes a system controller and a display electrically connected to the system controller, and the system controller is electrically connected to at least two of the camera components.

6. The hole pin part measuring device according to claim 1 is characterized in that: The axes of each group of camera components form a certain angle with the plane where the measuring platform is located, and the angles between each group of camera components are not less than 15°.

7. A method for measuring a hole pin part, characterized in that: The hole pin part measuring method comprises the following steps: S1: Provide the hole pin part measuring device as claimed in claim 1; S2: fixing the calibration plate on the measuring platform, controlling the rotary motor to drive the measuring platform to rotate, and at least two groups of camera assemblies measuring the size of the hole on the calibration plate; S3: Control the extension and retraction of the support rod to control the measuring platform to be at different heights, repeat step S2, obtain the measurement result of the hole on the calibration plate, compare the measurement result with the actual size of the hole on the calibration plate, obtain the measurement error, calibrate different camera components, and automatically change the recognition parameters in the system controller; S4: providing a hole pin part, recording the number of holes and pins on the hole pin part, and placing the hole pin part on the measuring platform; S5: At least two groups of the camera assemblies detect the number of holes and pins on the hole pin part. If the number of hole pins detected is the same as the actual number of hole pins of the hole pin part, proceed to step S6. If they are different, the height of the measuring platform is changed by controlling the extension and retraction amount of the support rod, and the angle of the measuring platform is controlled by controlling the rotation of the measuring platform driven by the rotary motor, and re-measurement is performed until the number of hole pins detected is the same as the actual number of hole pins of the hole pin part. S6: Calculate the coordinates and diameter of each hole pin feature on the hole pin part in three-dimensional space.

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