A core height measuring device and measuring method

Abstract

The application discloses a core height measuring device, comprising a light source shooting assembly, a motion assembly, a control assembly and a core pressing assembly; a core punching sheet stack is arranged between a pressing ring of the core pressing assembly and a core pressing platform, and a tooth pressing plate is further arranged on a core punching sheet contact part; an outer circle of the core punching sheet is provided with a mark notch structure, and a continuous groove is formed after stacking and pressing, so that the light source shooting assembly measures the core height; the light source shooting assembly is arranged on the motion assembly; under the control of the control assembly, the distance and the height of the light source shooting assembly relative to the core pressing assembly can be adjusted under the driving of the motion assembly; and the application further discloses a measuring method, in which the data shot by the core height measuring device on the outer surface of the core is analyzed and the core height is calculated, the core height is accurately measured with the help of machine vision detection technology, and an automatic measuring process is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor detection equipment, more particularly to a core height measuring device and a measuring method. BACKGROUND

[0002] In the motor production process, measuring the core height under pressure is an important link in the manufacturing process of motor stator core and rotor core, and is the key to ensuring the motor stacking coefficient. The motor stator core and rotor core need to be strictly controlled and measured in the manufacturing process.

[0003] In the prior art, manual stacking and manual detection operation mode is basically adopted. Usually, the height of the core is measured by using a vernier caliper (suitable for core outer circle mark notch or buckle notch) or a steel ruler under the condition that the core is pressed by an oil press, and the core is operated by punching sheet increasing or decreasing according to the obtained results.

[0004] However, the measurement of the core height by using the vernier caliper or the steel ruler is manual measurement, which has low measurement efficiency. When the vernier caliper or the steel ruler is used, it should be ensured that the measuring tool is perpendicular to the core, otherwise measurement error is easily caused. Moreover, the measurement is usually carried out in a relatively closed oil press under pressure, which has safety hazards.

[0005] Therefore, there is an urgent need for a motor core height automatic measuring device, which can realize automatic operation of the core height measuring process, automatic collection of data, improve the automation level of detection and the accuracy of detection results, and improve the production safety of the core height measuring process. SUMMARY

[0006] To solve the above technical problems, the present application provides a core height measuring device, which realizes automatic measurement process by using machine vision detection technology to accurately measure the core height under the stacking state of the core.

[0007] The core height measuring device provided by the present application has the following specific technical solutions. The core height measuring device comprises a light source shooting assembly, a motion assembly, a control assembly and a core pressing assembly.

[0008] The core pressing assembly specifically comprises a pressing ring and a core pressing platform.

[0009] The core punching sheet is stacked between the pressing ring and the core pressing platform, and the bottom of the pressing ring, the top of the core pressing platform and the core punching sheet contact part are further provided with a toothed pressing plate.

[0010] The core punching sheet outer circle is provided with a mark notch structure, and a continuous groove along the height direction is formed on the outer circle of the stacked core for measuring the core height.

[0011] The light source photographing assembly is arranged on the motion assembly;

[0012] Under the control of the control assembly, the light source photographing assembly is driven by the motion assembly to adjust the distance and height from the core pressing assembly;

[0013] The control assembly analyzes the data of the outer surface of the core photographed by the light source photographing assembly and calculates the height of the core.

[0014] Preferably, the motion assembly specifically comprises a distance moving unit and a height moving unit.

[0015] The distance moving unit is used to adjust the distance between the light source photographing assembly and the core pressing assembly.

[0016] The height moving unit is used to adjust the height between the light source photographing assembly and the core pressing assembly.

[0017] Preferably, the distance moving unit and the height moving unit are both connected with the output shaft of a servo motor independently and controlled by the control assembly.

[0018] Preferably, the control assembly is a processing chip capable of receiving and processing digital signals.

[0019] Preferably, the control assembly further comprises a control console for controlling the motion assembly.

[0020] Preferably, the control assembly further comprises a display unit for displaying the data photographed by the light source photographing assembly in real time.

[0021] Preferably, the processing chip and the display unit are integrated in the control console.

[0022] Preferably, the light source of the light source photographing assembly is one of LED light source, halogen fiber light source and high-frequency fluorescent light source, or a combination of multiple types; and the photographing assembly is a CCD camera.

[0023] Preferably, the core pressing assembly can rotate around its center to be photographed by the light source photographing assembly.

[0024] Meanwhile, the application also provides a core height measuring method using the above core height measuring device, and the specific measuring steps are as follows:

[0025] (1) core stacking, the core punching sheet is stacked between the pressing ring and the core pressing platform, and the core punching sheet is stacked and pressed by using the pressing equipment, so that the mark notch structure provided on the outer circle of the core punching sheet forms a continuous groove along the height direction on the outer circle of the stator core after stacking, and the surface color and profile difference formed by the groove can be used for distinguishing the core and the tooth pressing plate by the shooting assembly;

[0026] (2) distance calibration, the distance and height of the light source shooting assembly and the core pressing assembly are adjusted by the motion assembly;

[0027] In the distance adjustment, the distance between the light source shooting assembly and the surface of the core with different outer diameters is kept consistent, and the detection of cores with different outer diameters can be realized;

[0028] In the height adjustment, the coverage area of the light source shooting assembly can meet the detection of cores with different heights, and the detection of cores with different heights can be realized;

[0029] (3) height detection, the light source shooting assembly is moved below the core, the field of view of the light source shooting assembly covers the position below the joint between the core and the tooth pressing plate, the outer surface of the core is photographed once, the position of the bottom edge of the core is identified by vision, and the starting position value h1 of the bottom of the core is calculated according to the height at the time of photographing and the position of the bottom edge of the core identified by vision;

[0030] The light source shooting assembly is moved upward, the field of view of the light source shooting assembly covers the position above the joint between the core and the tooth pressing plate, the outer surface of the core is photographed again, the position of the upper edge of the core is identified by vision, and the position value h2 of the top of the core is calculated according to the height at the time of photographing and the position of the upper edge of the core identified by vision;

[0031] The height H of the core is calculated by the difference between the two vision detection photos and the servo moving distance.

[0032] The core height measuring device provided by the application comprises a light source, a shooting assembly, a control assembly and a motion assembly, and can realize automatic detection of the core height by dynamically photographing and measuring the core.

[0033] The core height measuring device provided by the application can be arranged outside the oil press, and the detection process is non-contact measurement for the core and the oil press, the installation and operation space are not limited, the integration of the device and the core pressing device is good, the detection process is unmanned, and the safety hidden danger is eliminated. The up-down and front-back movement of the light source and the shooting assembly is controlled by the motion assembly, so that the field of view of the light source and the camera can meet the rapid detection of cores with different outer diameters and different heights, and the detection efficiency of the core is improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0035] Fig. 1 The iron core height measuring device structure schematic diagram provided by the embodiment of the present application is shown in the figure.

[0036] Fig. 2 The iron core punching plan view structure schematic diagram is shown in the figure.

[0037] The figure mark: 1, the pressing ring; 2, the tooth pressing plate; 3, the iron core; 4, the mark notch; 5, the height activity unit; 6, the light source shooting component; 7, the distance activity unit; 8, the iron core pressing platform; 9, the iron core punching. DETAILED DESCRIPTION

[0038] In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments only constitute some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0040] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0041] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an indicated number of technical features. Thus, features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" or "several" is two or more, unless otherwise explicitly and specifically limited.

[0042] It should be noted that the structures, proportions, sizes, etc. shown in the drawings of the present application are only used to cooperate with the disclosed content, to be understood and read by those skilled in the art, and do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, which does not affect the effect and purpose that can be achieved by the present application, should still fall within the scope of the disclosed technical content.

[0043] The present application is written in a progressive manner in this embodiment.

[0044] As shown in Figs. 1-2 , the present application provides a core height measuring device, which mainly includes a light source shooting assembly 6, a motion assembly, a control assembly, and a core pressing assembly;

[0045] The core pressing assembly is the main component for stacking and pressing the core punching sheet 9, and can be arranged outside the oil press. The specific structure thereof is shown in Fig. 1 , which includes a pressing ring 1 and a core pressing platform.

[0046] The core punching sheet 9 is stacked along the height direction between the pressing ring 1 and the core pressing platform, and the bottom of the pressing ring 1 and the top of the core pressing platform are provided with a toothed pressing plate 2 in contact with the core punching sheet 9.

[0047] As shown in Fig. 2 , in this embodiment, the outer circle of the core punching sheet 9 is provided with a mark notch 4 structure, and the outer circle of the stacked core 3 forms a continuous groove along the height direction. In this embodiment, the surface color and contour difference formed by the groove can be used by the light source shooting assembly 6 to identify and distinguish the core 3 and the toothed pressing plate 2, so as to measure the height of the core 3 by the light source shooting assembly 6.

[0048] The motion assembly provides a mounting position for the light source shooting assembly 6, so that the light source shooting assembly 6 can be movably arranged on the motion assembly.

[0049] In this embodiment, as shown in Fig. 1As shown, under the control of the control assembly, the light source shooting assembly 6 is adjustable in distance and height from the iron core 3 pressing assembly under the driving of the motion assembly;

[0050] The control assembly can analyze the data shot by the light source shooting assembly 6 on the outer surface of the iron core 3 and calculate the height of the iron core 3;

[0051] Compared with the manual detection of the height of the iron core 3 in the prior art, the measurement efficiency is low, and when a vernier caliper or a steel ruler is used, the measuring tool should be kept perpendicular to the iron core 3, otherwise measurement error may be caused. The measurement device provided by the application is non-contact measurement for the iron core 3 and the oil press, the installation and operation space is not limited, the device is well integrated with the iron core pressing device, the detection process is unmanned, and safety hazards are eliminated.

[0052] As preferred, the motion assembly in the embodiment is further limited. In the embodiment, as shown, Fig. 1 The motion assembly specifically includes a distance moving unit 7 and a height moving unit 5.

[0053] The distance moving unit 7 can move in the horizontal direction to adjust the distance between the light source shooting assembly 6 and the iron core 3 pressing assembly.

[0054] The height moving unit 5 can move in the vertical direction to adjust the height of the light source shooting assembly 6 from the iron core 3 pressing assembly.

[0055] As preferred, the motion assembly in the embodiment is further limited. In the embodiment, the distance moving unit 7 and the height moving unit 5 are separately connected with the output shaft of the servo motor and controlled independently by the control assembly. The use of the servo motor for control can realize more accurate action adjustment.

[0056] As preferred, the control assembly in the embodiment is further limited. The control assembly specifically is a processing chip capable of receiving and processing digital signals. Since visual detection and image analysis of the height of the iron core 3 are needed for the image shot by the light source shooting assembly 6, the control assembly needs to have certain image processing capability.

[0057] Further, in order to facilitate the convenient control of the motion assembly, the control assembly further includes a control console for controlling the motion assembly, thereby improving the measurement convenience.

[0058] Further, the control assembly further comprises a display unit, which is configured to display the data captured by the light source capturing assembly 6 in real time and to operate the data visualization.

[0059] Further, the control assembly is further limited in the embodiment, and the processing chip and the display unit are integrally arranged in the control console, so as to reduce the size of the device.

[0060] Preferably, the light source capturing assembly 6 in the embodiment is further limited, and in the embodiment, the light source of the light source capturing assembly 6 is one of LED light source, halogen fiber light source, and high-frequency fluorescent light source, or a combination of multiple types; and the capturing assembly is a CCD camera.

[0061] Preferably, the light source capturing assembly 6 in the embodiment is further limited, and the iron core 3 pressing assembly can rotate around its center, so that the light source capturing assembly 6 captures the circumference of the iron core 3 punching sheet, so as to find the groove formed along the height direction on the outer circle of the iron core 3.

[0062] Meanwhile, the embodiment also discloses an iron core height measuring method comprising the iron core height measuring device, and the iron core height measuring method is as follows:

[0063] (1) Iron core stacking: the iron core punching sheet 9 is arranged between the pressing ring 1 and the iron core pressing platform, and the pressing equipment is used for stacking and pressing, so that the mark notch 4 structure arranged on the outer circle of the iron core punching sheet 9 forms a groove along the height direction on the outer circle of the stator iron core 3 after pressing, and the surface color and profile difference of the groove can be used for the capturing assembly to identify and distinguish the iron core 3 and the tooth pressing plate 2;

[0064] (2) Distance calibration: the distance and height of the light source capturing assembly 6 and the iron core pressing assembly are adjusted through the motion assembly;

[0065] In the distance adjustment, the distance between the light source capturing assembly 6 and the surface of the iron core 3 with different outer diameters is kept consistent, so as to realize the detection of the iron core 3 with different outer diameters;

[0066] In the height adjustment, the coverage area of the light source capturing assembly 6 can meet the detection of the iron core 3 with different heights, so as to realize the detection of the iron core 3 with different heights;

[0067] (3) height detection, moving the light source shooting assembly 6 to below the core 3, making the field of view of the light source shooting assembly 6 cover the joint position between the core 3 and the tooth press plate 2 below, taking a photo of the outer surface of the core 3, visually recognizing the position of the upper edge of the core 3 according to the color and profile difference of the surface formed by the notch 4, and calculating the starting position value h1 of the bottom of the core 3 according to the height at the time of shooting and the visually recognized position of the bottom edge of the core 3;

[0068] moving the shooting assembly upward, making the field of view of the light source shooting assembly 6 cover the joint position between the core 3 and the tooth press plate 2 above, taking a photo of the outer surface of the core 3 again, visually recognizing the position of the upper edge of the core 3 according to the color and profile difference of the surface formed by the notch 4, and calculating the position value h2 of the top of the core 3 according to the height at the time of shooting and the visually recognized position of the upper edge of the core 3;

[0069] calculating the height H of the core 3 according to the difference between the two photos and the servo moving distance.

[0070] The above description of disclosed embodiments enables those skilled in the art to carry out or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A core height measuring device, characterized in that, include: Light source imaging component, motion component, control component, iron core pressing component; The core pressing assembly specifically includes: a pressing ring and a core pressing platform; The core laminations are stacked between the pressure ring and the core pressing platform, and toothed pressure plates are also provided at the bottom of the pressure ring, the top of the core pressing platform, and the contact parts with the core laminations. The outer circle of the core lamination is provided with a marking notch structure, forming a continuous groove along the height direction on the outer circle of the stacked core, which is used to measure the core height; The light source imaging component is mounted on the motion component; Under the control of the control component, the distance and height between the light source imaging component and the iron core pressing component can be adjusted by the motion component. The control component analyzes the data captured by the light source imaging component on the outer surface of the iron core and calculates the height of the iron core; The method for measuring the height of stacked core laminations using the aforementioned core height measuring device is as follows: (1) Core stacking: The core laminations are stacked between the pressure ring and the core pressing platform, and the pressing equipment is used to stack them so that the outer circle of the core laminations has a marked notch structure, forming a continuous groove along the height direction on the outer circle of the stacked stator core. The surface color and contour difference of the groove can be used by the shooting component to identify and distinguish the core and the tooth pressure plate. (2) Distance calibration: The distance and height between the light source imaging component and the iron core pressing component are adjusted by the motion component; In terms of distance adjustment, it is ensured that the distance between the light source imaging component and the surface of the iron core with different outer diameters remains consistent, which enables the detection of iron cores with different outer diameters; In terms of height adjustment, it is ensured that the area covered by the light source imaging component can meet the detection requirements of different models of iron cores, enabling the detection of iron cores of different heights and sizes; (3) Height detection: Move the light source imaging component to the bottom of the iron core so that the field of view of the light source imaging component covers the bottom of the iron core and the joint of the lower tooth pressure plate. Take a picture of the outer surface of the iron core, visually identify the position of the bottom edge of the iron core, and calculate the starting position value h1 of the bottom of the iron core based on the height when taking the picture and the visually identified position of the bottom edge of the iron core. Move the shooting component upward so that the field of view of the light source shooting component covers the top of the iron core and the joint position of the tooth pressure plate; take another picture of the outer surface of the iron core, visually identify the position of the upper edge of the iron core, and calculate the top position value h2 of the iron core based on the height of this picture and the visually identified position of the upper edge of the iron core. The core height H = h2 - h1 is calculated by the difference between two visual inspection photos and the servo movement distance.

2. The core height measuring device according to claim 1, characterized in that, The motion components specifically include: a distance motion unit and a height motion unit; The distance adjustment unit is used to adjust the distance between the light source imaging component and the iron core pressing component; The height adjustment unit is used to adjust the height of the light source imaging component and the iron core pressing component.

3. The core height measuring device according to claim 2, characterized in that, Both the distance movement unit and the height movement unit are individually connected to the output shaft of the servo motor and are independently controlled by the control component.

4. The core height measuring device according to claim 3, characterized in that, The control component is specifically a processing chip capable of accepting and processing digital signals.

5. The core height measuring device according to claim 4, characterized in that, The control component also includes a console for controlling the motion component.

6. The core height measuring device according to claim 5, characterized in that, The control component also includes a display unit for real-time display and operation of the data captured by the light source imaging component.

7. The core height measuring device according to claim 6, characterized in that, The processing chip and the display unit are integrated in the console.

8. The core height measuring device according to any one of claims 1 to 7, characterized in that, The light source for the imaging component is one or a combination of LED light source, halogen fiber optic light source, and high-frequency fluorescent light source; the imaging component is a CCD camera.

9. The core height measuring device according to claim 8, characterized in that, The core pressing assembly can rotate around its center, allowing the light source imaging assembly to capture images of the circumference of the core laminations.

Images