Vacuum arc-extinguishing chamber assembly tool and method

Abstract

The invention discloses a vacuum arc-extinguishing chamber assembly tool and method, and aims to overcome the defects that contact measurement in the prior art easily causes part displacement and is low in adjustment efficiency. According to the tool, a reference part is fixed through the positioning tool, the image acquisition device acquires images in a non-contact mode, the processing device calculates position parameters, and the display device displays position relation guiding information in real time. The assembling method comprises the steps of fixing and establishing a reference, collecting, calculating and displaying position deviation guide information of a to-be-assembled part and the reference in real time, and adjusting according to the position deviation guide information until the precision requirement is met. And non-contact, real-time and visual high-precision assembly is realized.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of vacuum arc-extinguishing chamber assembly, and particularly relates to a vacuum arc-extinguishing chamber assembly tool and method. BACKGROUND

[0002] During high-temperature welding, the porcelain shell of the vacuum arc-extinguishing chamber is subjected to stress due to welding heat effect, and the stress directly affects the sealing strength of the porcelain sealing part of the vacuum arc-extinguishing chamber. Under the premise of consistent structural parameters, the higher the assembly and sealing coaxiality of the cover plate and the porcelain shell, the smaller the stress generated by the porcelain shell, the higher the sealing strength of the porcelain sealing part, and the better the overall coaxiality of the vacuum arc-extinguishing chamber. When the vacuum arc-extinguishing chamber is installed in a circuit breaker, the impact damage to the vacuum arc-extinguishing chamber during the opening and closing operation process is reduced, and the structural strength reliability of the arc-extinguishing chamber is significantly improved. Therefore, higher technical requirements are put forward for the form and position tolerances of the vacuum arc-extinguishing chamber in specific use occasions such as high-reliability demand scenarios and long-life high-reliability application scenarios.

[0003] Under the above high form and position tolerance requirements, the traditional self-positioning method, the conventional tooling mold positioning method and the positioning method depending on the skills of the operator cannot meet the preset technical standards. Although a coaxiality tester is used throughout the arc-extinguishing chamber assembly process to ensure that the relative positions of the porcelain shell, the sealing ring and the cover plate meet the technical requirements, this method has obvious defects: the adjustment process of the dial gauge support is time-consuming and laborious, and when the product is light in weight, the light and small parts are prone to displacement during the contact process of the dial gauge probe and the product, thereby affecting the assembly precision of the product.

[0004] Based on the deficiencies of the prior art, a technical scheme for visually guiding the assembly of the vacuum arc-extinguishing chamber is needed to effectively improve the assembly precision and meet the high form and position tolerance and high reliability application requirements. SUMMARY

[0005] The application aims to provide a vacuum arc-extinguishing chamber assembly tool and method to overcome the deficiencies of the prior art that the contact type measurement is prone to cause part displacement and has low adjustment efficiency.

[0006] To achieve the above-mentioned purpose, the application adopts the following technical scheme: The application provides a vacuum arc-extinguishing chamber assembly tool, which comprises: A positioning tool is used to fix a reference part. An image acquisition device is used to acquire images of the to-be-assembled part and the reference part. A processing device is in communication connection with the image acquisition device and is used to calculate the position parameters of the to-be-assembled part according to the images acquired by the image acquisition device. A display device, which is communicatively connected with the processing device, is configured to display guiding information reflecting the positional relationship between the to-be-assembled part and the reference part in real time based on the positional parameter calculated by the processing device.

[0007] According to an embodiment of the present application, the image acquisition device comprises a camera, a lens mounted on the camera, and a light source arranged around the lens and providing illumination for the acquisition area.

[0008] According to an embodiment of the present application, the positioning tool is arranged on an assembly platform, and the processing device is arranged inside the assembly platform.

[0009] According to an embodiment of the present application, the assembly platform is provided with a motion module, and the motion module is connected with the image acquisition device.

[0010] According to an embodiment of the present application, the motion module is communicatively connected with a control module.

[0011] The present application also provides a method for assembling a vacuum interrupter, comprising: fixing the position of the reference part, acquiring an image of the reference part, and calculating a positional parameter of the reference part; placing the to-be-assembled part in an assembly area near the reference part, acquiring an image of the to-be-assembled part in real time, calculating a positional parameter of the to-be-assembled part, and displaying guiding information reflecting the positional relationship between the to-be-assembled part and the reference part in real time; adjusting the position of the to-be-assembled part according to the guiding information until the position of the to-be-assembled part meets a preset assembly precision.

[0012] According to an embodiment of the present application, the image of the to-be-assembled part is extracted by an image recognition algorithm, and the positional parameter of the to-be-assembled part is a center coordinate of the to-be-assembled part calculated based on contour point coordinates.

[0013] According to an embodiment of the present application, the method further comprises: when the contour of the to-be-assembled part is partially blocked in the image, fitting the image of the to-be-assembled part by a least square method according to 3 to 5 contour point coordinates not in a same line in the image of the to-be-assembled part, and calculating the center coordinate of the to-be-assembled part.

[0014] According to an embodiment of the present application, the guiding information comprises: a reference mark representing the reference position, a real-time mark representing the real-time position of the to-be-assembled part, and an allowed assembly area generated based on the preset assembly precision and surrounding the reference mark.

[0015] According to one embodiment of the present application, the allowed assembly area is an annular area, and the color of the annular area dynamically changes according to whether the real-time mark is located inside the annular area.

[0016] Compared with the prior art, the present application has the following beneficial technical effects: The present application provides a vacuum interrupter assembly tool, which overcomes the inherent defects of contact measurement by using non-contact measurement principle. The image acquisition device acquires part images in an optical manner, completely avoiding physical contact between the measurement probe and the part, thereby eliminating the risk of displacement of small parts caused by contact force. At the same time, the processing device performs real-time calculation on the image data and drives the display device to synchronously generate visualized position relationship guidance information. This process changes the traditional, lagging adjustment mode that relies on repeated physical correction and reading into a guidance mode continuously driven by real-time image data and intuitive graphical interface. The operator can make direct and rapid adjustments based on continuous visual feedback, significantly reducing intermediate links and debugging time, thereby greatly improving the overall efficiency of assembly adjustment.

[0017] The present application also provides a vacuum interrupter assembly method, which overcomes the shortcomings of the prior art by using non-contact measurement and real-time visualization throughout the entire process. During the entire process, the acquisition of position information completely relies on the acquisition and calculation of part images, avoiding any physical contact between measurement components and parts, thereby fundamentally eliminating the risk of part displacement caused by contact force. At the same time, the method changes the discrete and lagging cycle of traditional measurement, reading, and adjustment into a continuous data stream of real-time acquisition, real-time calculation, and real-time display. The operator adjusts based on the continuously updated guidance information, with a clear target, without repeatedly switching between measurement instruments and workpieces, making each adjustment directly effective, greatly reducing blind debugging and checking time, and thereby improving the precision, reliability, and adjustment efficiency of the assembly process as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a schematic diagram of the overall structure of a vacuum interrupter assembly tool according to an embodiment of the present application.

[0019] Figure 2 FIG. 2 is a schematic diagram of the overall structure of a vacuum interrupter according to an embodiment of the present application.

[0020] Figure 3 FIG. 3 is a flowchart of a vacuum interrupter assembly method according to an embodiment of the present application.

[0021] In the figure, 1, camera; 2, lens; 3, light source; 4, computer; 5, display screen; 6, assembly platform; 7, control module; 8, movement module; 9, positioning tool; 10, moving cover plate; 11, bellows; 12, moving conductive rod; 13, porcelain shell; 14, moving contact; 15, static electrode; 16, static conductive rod; 17, static cover plate. DETAILED DESCRIPTION

[0022] The high-precision assembly of the vacuum arc-extinguishing chamber is crucial to its sealing strength and long-term reliability. The existing assembly methods such as self-positioning, simple tooling or manual alignment are difficult to guarantee micron-level coaxiality. Although contact-type measuring instruments (such as dial gauges) can accurately measure, there are inherent defects such as tedious adjustment and displacement of light and small parts caused by measuring needle contact. In order to improve the assembly precision and efficiency, a non-contact, real-time feedback guidance scheme is needed.

[0023] Based on the above background, the present application proposes a vacuum arc-extinguishing chamber assembly tool and method, which replaces the physical measuring needle with non-contact image acquisition, completely avoiding the displacement of parts caused by contact force. At the same time, the system acquires, calculates and visualizes the position relationship in real time, changes the traditional discontinuous and lagging measurement and adjustment mode to a continuous and intuitive guidance and adjustment closed loop. The operator can directly make accurate fine adjustment according to the real-time updated guidance information, without repeatedly switching between visual and operation, so as to significantly shorten the adjustment time and improve the overall assembly efficiency while ensuring high precision.

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" 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 therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a number" means two or more, unless otherwise explicitly specified.

[0028] Reference Figure 1 As shown, in one specific embodiment of the present invention, the provided vacuum interrupter assembly fixture includes: Positioning fixture 9 is used to fix the reference part; An image acquisition device is used to acquire images of the parts to be assembled and the reference parts. The processing device is communicatively connected to the image acquisition device and is used to calculate the position parameters of the part to be assembled based on the image acquired by the image acquisition device. The display device is communicatively connected to the processing device and is used to display guidance information reflecting the positional relationship between the part to be assembled and the reference part in real time based on the position parameters calculated by the processing device.

[0029] In this specific embodiment, the positioning fixture 9 constitutes the physical reference basis of this assembly system. Its core function is to firmly fix the reference part of the vacuum interrupter, ensuring that the spatial position of the reference part remains constant throughout the entire assembly process. The establishment of this fixed reference serves as the absolute reference origin for all subsequent measurements, calculations, and position comparisons, providing a fundamental prerequisite for the precise alignment of the parts to be assembled.

[0030] The image acquisition device is used to achieve non-contact measurement. It captures image information of the parts to be assembled in the assembly area in real time through optical acquisition, and converts the physical position parameters and contour features of the parts into digital image data that can be processed by subsequent modules. This non-contact acquisition mode fundamentally avoids the problems of part displacement or surface damage that may be caused when traditional contact probes come into contact with the parts. It is especially suitable for the assembly of small and precision parts and is highly compatible with the assembly requirements of vacuum interrupters.

[0031] The processing device is the calculation and control core of the system, which receives digital image data transmitted from the image acquisition device and performs operation analysis on the image data: specifically, the contour feature parameters of the parts to be assembled are extracted by image recognition algorithm, and the quantitative parameters representing the spatial position of the parts to be assembled are calculated based on the contour feature parameters, such as contour geometric center coordinates, edge reference point coordinates, etc. The operation analysis process is the key technical link to realize the conversion of visual image to accurate quantitative data, and provides data support for subsequent position adjustment guidance.

[0032] The display device is the human-computer interaction interface, which is in real-time communication connection with the processing device, receives the quantitative position parameters output by the processing device, and visualizes the parameters as intuitive graphical identifiers, direction symbols or color contrasts, etc. The core role of the guidance information is to real-time and dynamically show the relative position relationship between the current actual position of the parts to be assembled and the reference position of the reference parts fixed by the positioning tool 9, including but not limited to the key information such as offset direction, offset distance and deviation angle. The operator can judge the current assembly state in real time by observing the real-time intuitive feedback provided by the display device, and perform accurate position adjustment operation on the parts to be assembled according to the guidance information.

[0033] The positioning tool 9, the image acquisition device, the processing device and the display device are not independent, but cooperate to form a closed-loop control system that works together: the positioning tool 9 provides a stable and reliable fixed reference; the image acquisition device is the "perception unit" of the system, which continuously obtains the position state information of the parts to be assembled; the processing device is the "operation control unit" of the system, which performs real-time calculation and processing on the collected image information; the display device is the "guidance output unit" of the system, which feeds back the calculation results of the processing device to the operator in a visual form. The cooperative working mechanism realizes the real-time cycle of state perception, data calculation and visual guidance, so that the assembly process of the vacuum interrupter is transformed from the traditional mode relying on the experience and subjective judgment of the operator to the modern operation mode driven by quantitative data and guided by visual information in real time. Finally, the coaxiality precision, operation intuitiveness and overall assembly efficiency of the vacuum interrupter assembly are significantly improved, effectively meeting the application requirements of high form and position tolerance and high reliability.

[0034] In another specific embodiment of the present application, the image acquisition device of the vacuum interrupter assembly tool comprises a camera 1, a lens 2 adapted to be mounted on the camera 1, and a light source 3 arranged around the outer periphery of the lens 2, which is used to provide uniform and stable illumination for the assembly area, ensuring the clarity and integrity of image acquisition. The assembly tool further comprises a horizontally arranged assembly platform 6, the positioning tool 9 is detachably fixed to the preset reference area of the assembly platform 6, and the processing device is integrally arranged in the internal cavity of the assembly platform 6, which not only saves installation space, but also avoids the interference of the external environment on the processing device. The upper surface of the assembly platform 6 is provided with a motion module 8, which is rigidly connected with the image acquisition device and is used to drive the image acquisition device to move in a preset direction; the motion module 8 is communicatively connected with a control module 7, which is used to receive operation instructions or preset program signals, and then control the motion trajectory and displacement of the motion module 8. The motion module 8 comprises two groups of mutually perpendicular linear tracks, one group extending along the length direction of the assembly platform 6, and the other group extending along the width direction of the assembly platform 6, the camera 1 is slidably connected with the linear tracks through a sliding seat, the lens 2 is coaxially connected to the bottom of the camera 1, and the light source 3 is an annular light source and is coaxially arranged outside the lens 2. The control module 7 is integrated on the operation panel of the assembly platform 6, and the operator can input instructions through the control module 7 to adjust the position of the camera 1 along the two groups of linear tracks, so as to adapt to the assembly and measurement requirements of vacuum interrupters of different specifications, and improve the versatility of the tool. The processing device is specifically a computer 4, which is built-in with image recognition algorithms and data processing programs, and is communicatively connected with the camera 1 and the control module 7; the assembly tool further comprises a display screen 5, which is communicatively connected with the computer 4 and is used to visually present data processing results and guide information, and the display screen 5 can be embeddedly installed on the operation panel of the assembly platform 6 or fixed on the side of the assembly platform 6 through a support, which is convenient for the operator to observe. The assembly tool of the present embodiment realizes the technical effects of adjustable measurement position and wide adaptation range through modular design, wherein the frame rate of the camera 1 is set to 4-10 fps, which can meet the real-time measurement requirements of the moving process of the parts to be assembled, and ensure the timeliness of position parameter calculation. According to the structural characteristics that the vacuum interrupter parts are mostly circular or elliptical, the built-in algorithm of the computer 4 supports that when the light is relatively dark or part of the part surface is blocked, based on the coordinates of 3-5 non-collinear contour points collected, the least square method is used to algebraically fit the general equation of the circle or ellipse, and the constraint condition of the major axis and the minor axis needs to be met when fitting the ellipse, and then the geometric parameters of the part are accurately calculated, including the center coordinates, radius of the circular part, and the center coordinates, major axis length, minor axis length and rotation angle of the elliptical part, and the part contour image is generated through the OpenCV function and is displayed on the display screen 5 in real time.

[0035] The embodiment of the present application also provides a vacuum arc-extinguishing chamber assembling method, referring to Figure 3 as shown, comprising: Fixing the reference part position, collecting the reference part image, and calculating the reference part position parameter; Placing the part to be assembled in the assembling area near the reference part, collecting the part-to-be-assembled image in real time, calculating the position parameter of the part to be assembled, and displaying the guiding information reflecting the position relationship between the part to be assembled and the reference part in real time; Adjusting the position of the part to be assembled according to the guiding information until the position of the part to be assembled meets the preset assembling accuracy.

[0036] In the embodiment, the reference part is firmly fixed to ensure its constant physical position, and then the image information of the reference part is calculated and analyzed, the contour features of the reference part are extracted, and the corresponding position parameter is calculated, and then a unique and stable coordinate origin is defined in the digital space. The core of this step is to convert the physical assembly reference into a data reference that can be continuously compared by the computer, providing a standardized reference basis for accurate measurement of the entire assembly process.

[0037] After placing the part to be assembled in the preset assembling area, the image information of the part to be assembled is continuously collected according to the preset sampling frequency, and the position parameter of the part to be assembled is calculated in real time, and the real-time position parameter is compared and calculated with the pre-calculated reference part position parameter. The operation result is not a simple numerical output, but is converted into intuitive guiding information, which converts the microscopic position deviation that is difficult to detect in traditional assembly into information that can be directly perceived by the operator.

[0038] The operator adjusts the spatial position of the part to be assembled according to the guiding information. This adjustment process is not a blind operation relying on experience, but a precise control carried out under the guidance of clear spatial position relationship. During the adjustment process, the system continuously performs image collection, data calculation, and guiding display processes. The guiding information is dynamically updated with the change of the position of the part to be assembled until the position parameter of the part to be assembled meets the preset assembling accuracy threshold, that is, the tolerance of the part to be assembled and the reference part is within the allowable range, and the adjustment is completed.

[0039] The three steps of establishing a benchmark, real-time monitoring feedback and precise adjustment above constitute a complete data-driven high-precision assembly closed loop: the benchmark establishment step ensures the uniqueness and stability of the comparison standard through the dual solidification of physical benchmark and data benchmark; the real-time monitoring and visual feedback step changes the assembly precision control from the traditional result inspection to process guidance, realizing the control of the assembly process; the adjustment step based on guidance completes the effective landing from data information to operation action. Through the coordinated operation of benchmark definition, real-time sensing, intuitive feedback and precise regulation, the traditional assembly mode relying on the personal skills and experience of operators is changed into a controllable assembly process with real-time data as the core and visual information as the guide, thereby systematically improving the precision level and consistency of the vacuum interrupter assembly and effectively meeting the use requirements of high-form-position-tolerance and high-reliability application scenarios.

[0040] In another specific embodiment of the present application, the image of the part to be assembled is subjected to feature extraction by a preset image recognition algorithm, and the position parameter of the part to be assembled is specifically the center coordinate of the part to be assembled calculated based on the fitting of the contour point coordinate. The circular part is the center coordinate of the circle, and the elliptical part is the center coordinate. The assembly method further includes a shielding compensation step. When the contour of the part to be assembled is partially shielded in the collected image, resulting in the inability to obtain the complete contour, 3 to 5 non-collinear effective contour point coordinates in the image of the part to be assembled are extracted by the image recognition algorithm, a fitting operation is performed on the effective contour point coordinates by the least square method, the contour model of the part is reconstructed, and the center coordinate of the part to be assembled is accurately calculated, thereby ensuring the accuracy of the position parameter measurement is not affected by the shielding. The guide information specifically includes a reference mark representing the reference position of the reference part, such as a crosshair or a circular reference frame, a real-time mark representing the real-time position of the part to be assembled, such as a graphic frame matched with the contour of the part, and an allowed assembly area generated around the reference mark based on a preset assembly accuracy threshold. The allowed assembly area is an annular area, and the inner diameter and the outer diameter thereof are determined by a preset coaxiality tolerance value. The display color of the annular area dynamically changes according to the position of the real-time mark. When the real-time mark is completely located inside the annular area, the annular area is displayed in green, prompting that the position of the part to be assembled meets the accuracy requirement. When the real-time mark is partially or completely located outside the annular area, the annular area is displayed in red, prompting that the position deviation of the part to be assembled exceeds the allowed range. In this embodiment, the cooperative working process of visual acquisition and algorithm compensation is as follows. First, the static cover plate is placed on the positioning tool 9 of the assembly platform 6, the positioning tool 9 forms a limiting and fixing on the static cover plate, the image acquisition device collects the image information of the static cover plate, the computer 4 calculates the center coordinate of the static cover plate by the image recognition algorithm, and the contour of the static cover plate is displayed in real time on the display screen 5 in the form of a plane coordinate system, which serves as the assembly reference. Subsequently, the sealing ring is placed in the assembly area. During the placement process, the camera 1 shoots the image of the sealing ring in real time at a frame rate of 4-10 fps. The computer 4 automatically generates the annular area of the allowed offset range according to the preset form and position tolerance such as the coaxiality tolerance value, and synchronously displays it on the display screen 5. The operator adjusts the placement position of the sealing ring according to the position relationship between the real-time mark and the annular area on the display screen 5 until the annular area is displayed in green, that is, the assembly position of the sealing ring meets the form and position tolerance requirements.

[0041] In order to make the vacuum interrupter assembly tool and method provided by the present application more easily understood, a specific embodiment of a combined use scene is provided for illustration.

[0042] The vacuum interrupter assembled in this embodiment is as shown in Figure 2As shown, it comprises a movable cover plate 10, a bellows 11, a movable conductive rod 12, a porcelain shell 13, a movable electrode 14, a static electrode 15, a static conductive rod 16 and a static cover plate 17, wherein the movable cover plate 10, the bellows 11, the movable conductive rod 12 and the movable electrode 14 are welded together to form a movable tube core, the static cover plate 17, the static conductive rod 16 and the static electrode 15 are welded together to form a static tube core, and a sealing ring can be selectively arranged according to product specifications to realize the sealed connection of the cover plate and the porcelain shell 13, that is, the sealing ring is clamped between the static cover plate 17 and the porcelain shell 13 and between the movable cover plate 10 and the porcelain shell 13. The assembly reference of the embodiment is set with the lower surface of the static cover plate 17 as the reference surface, the perpendicularity tolerance requirement of the inner hole of the movable cover plate 10 relative to the reference surface is φ1, unit: mm, and the coaxiality tolerance requirement of the porcelain shell 13, the sealing ring and the cover plate is not greater than a preset threshold, for example, 0.02 mm. The assembly tool installation and reference establishment process is as follows: first, the positioning tool 9 is fixed to the preset reference area of the assembly platform 6 by bolt connection, ensuring that there is no relative displacement between the positioning tool 9 and the assembly platform 6, and the flatness error of the assembly platform 6 is controlled within 0.01 mm, providing a stable physical reference for assembly; the upper surface of the positioning tool 9 is provided with a protruding limiting part adapted to the groove at the bottom of the static cover plate 17, or a limiting groove adapted to the shape of the static cover plate 17 is formed on the upper surface of the positioning tool 9, when the static tube core, that is, the static cover plate 17, the static conductive rod 16 and the static electrode 15 are placed on the positioning tool 9, the static tube core is circumferentially and axially limited through the clamping cooperation of the protruding limiting part and the groove, or the static cover plate 17 and the limiting groove, ensuring that its spatial position is constant during assembly; then the camera 1 is driven to move along the two groups of vertical linear tracks by controlling the motion module 8 through the control module 7, the height and horizontal position of the camera 1 are adjusted, the center area of the static tube core is located at the center of the shooting field of view of the camera 1, the light source 3 is turned on, and the light source brightness is adjusted to an appropriate gear, ensuring that the profile edge of the static tube core is clear and identifiable; finally, the image acquisition and processing program of the computer 4 is started, the camera 1 shoots the image of the static tube core, the light source 3 provides uniform illumination to avoid shadow interference, if part of the profile of the static tube core is invisible due to light or slight obstruction, the computer 4 extracts three non-collinear profile point coordinates through image recognition algorithm, fits the outer circle profile of the static cover plate 17 by using the least square method, calculates the center coordinates of the static cover plate 17, that is, the reference coordinates, generates a plane coordinate system on the display screen 5, displays a cross reference mark with the reference coordinates as the center, and generates a ring-shaped allowed assembly area based on the coaxiality tolerance threshold, the initial state is red.

[0043] The step-by-step assembly process is as follows: for the product containing the sealing ring, the operator places the sealing ring on the upper assembly surface of the static cover plate 17, the camera 1 shoots the image of the sealing ring in real time at a frame rate of 4-10 fps, the computer 4 continuously calculates the center coordinates of the sealing ring, and presents the real-time position of the sealing ring on the display screen 5 in the form of a dynamic circular mark, the operator observes the display screen 5, when the dynamic circular mark is located outside the annular allowed assembly area, the annular area displays red, according to the mark offset direction, for example, left offset, up offset, the sealing ring position is adjusted, when the dynamic circular mark completely enters the annular allowed assembly area, the annular area automatically switches to green, prompting that the sealing ring assembly position meets the coaxiality requirement, and the positioning of the sealing ring is completed; then the porcelain shell assembly is performed, the porcelain shell 13 is sleeved outside the positioned sealing ring, or is directly placed on the assembly surface of the static cover plate 17, the camera 1 shoots the port profile of the porcelain shell 13 in real time, the computer 4 fittingly calculates the center coordinates of the porcelain shell 13, and the relative position of the real-time mark and the reference mark of the porcelain shell 13 is synchronously displayed on the display screen 5, the operator adjusts the placing angle and horizontal position of the porcelain shell 13 according to the guiding information, until the annular allowed assembly area remains green, to ensure that the coaxiality of the porcelain shell 13 and the static cover plate 17 meets the requirement; for the product containing the double sealing ring, the above-mentioned sealing ring assembly steps are repeated, the second sealing ring is placed on the upper end assembly surface of the porcelain shell 13, and the positioning is completed through the real-time guidance of the display screen 5, to ensure that the coaxiality of the second sealing ring, the lower sealing ring and the porcelain shell 13 is consistent; finally, the moving tube core assembly is performed, the moving tube core, i.e., the moving cover plate 10 and the bellows 11, the moving conductive rod 12 and the moving electrode 14 integral piece are placed above the second sealing ring or on the upper end of the porcelain shell 13, the camera 1 shoots the profile image of the moving cover plate 10, the computer 4 calculates the center coordinates and displays the real-time mark on the display screen 5, the operator adjusts the position of the moving tube core, until the real-time mark is located in the annular allowed assembly area, the annular area remains green, and at the same time, the perpendicularity of the inner hole of the moving cover plate 10 relative to the reference surface meets the φ1 requirement, and the overall assembly is completed.

[0044] From the industrial application scene, the manual adjustment link in the embodiment can be replaced by a mechanical arm, the control module 7 is in communication connection with a mechanical arm control system, the guiding information output by the computer 4 is converted into a displacement control signal of the mechanical arm, and the mechanical arm automatically completes the part grabbing, adjusting and positioning according to the real-time position deviation, which can be directly popularized to a vacuum arc-extinguishing chamber assembly automatic line, and has good industrialization prospect.

[0045] The visual guidance vacuum interrupter assembly scheme provided by the application realizes the visual guidance of the assembly process by real-time shooting of the image of the part to be assembled through a camera, combining image recognition algorithm and least square fitting operation, accurately calculating the center coordinates and contour parameters of the part, and real-time presenting the reference mark, real-time mark of the part to be assembled and the allowed assembly area on the display screen, while for the insufficient light or part shielding scene, through the fitting compensation of 3-5 non-collinear contour points, the accuracy of position measurement is ensured not to be affected, forming a double guarantee mechanism of visual acquisition and algorithm compensation. The scheme adopts a non-contact measurement method, completely avoids the displacement problem of small and light parts caused by traditional contact type measuring needles, significantly improves the coaxiality precision and consistency of the vacuum interrupter assembly, and through the cooperation of the motion module and the control module, different specifications of vacuum interrupter products can be adapted, the universality is strong, the assembly process does not need to rely on the experience and skill of the operator, reduces the human error, and improves the assembly efficiency. In addition, the scheme can be seamlessly connected with automatic equipment such as mechanical arm, provides reliable technical support for the construction of the vacuum interrupter assembly automation production line, and has wide industrial application value.

[0046] The basic principles, main features and advantages of the application are shown and described above. Those skilled in the art should understand that the application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the application and are not intended to limit the application. Without departing from the spirit and scope of the application, various changes and improvements can be made to the application, and these changes and improvements all fall within the scope of the claimed application. The scope of protection of the application is defined by the appended claims and their equivalents.

Claims

1. A vacuum interrupter assembly fixture, characterized in that, include: Positioning fixture (9) is used to fix the reference part; An image acquisition device is used to acquire images of the parts to be assembled and the reference parts. The processing device is communicatively connected to the image acquisition device and is used to calculate the position parameters of the part to be assembled based on the image acquired by the image acquisition device. The display device is communicatively connected to the processing device and is used to display guidance information reflecting the positional relationship between the part to be assembled and the reference part in real time based on the position parameters calculated by the processing device.

2. The vacuum interrupter assembly fixture according to claim 1, characterized in that, The image acquisition device includes a camera (1), a lens (2) mounted on the camera (1), and a light source (3) disposed around the lens (2) and providing illumination to the acquisition area.

3. The vacuum interrupter assembly fixture according to claim 1, characterized in that, It also includes an assembly platform (6), the positioning fixture (9) is set on the assembly platform (6), and the processing device is set inside the assembly platform (6).

4. The vacuum interrupter assembly fixture according to claim 3, characterized in that, The assembly platform (6) is equipped with a motion module (8), which is connected to the image acquisition device.

5. The vacuum interrupter assembly fixture according to claim 4, characterized in that, The motion module (8) is communicatively connected to the control module (7).

6. A method for assembling a vacuum interrupter, characterized in that, include: The position of the reference part is fixed, the image of the reference part is acquired, and the position parameters of the reference part are calculated; The part to be assembled is placed in the assembly area near the reference part, the image of the part to be assembled is acquired in real time, the position parameters of the part to be assembled are calculated, and the guiding information reflecting the positional relationship between the part to be assembled and the reference part is displayed in real time. Adjust the position of the parts to be assembled according to the guidance information until the position of the parts to be assembled meets the preset assembly accuracy.

7. The method for assembling a vacuum interrupter according to claim 6, characterized in that, The image of the part to be assembled is extracted using an image recognition algorithm, and the position parameters of the part to be assembled are the center coordinates of the part to be assembled calculated based on the contour point coordinate fitting.

8. The method for assembling a vacuum interrupter according to claim 7, characterized in that, Also includes: When the outline of the part to be assembled is partially obscured in the image, the least squares method is used to fit the image of the part to be assembled based on the coordinates of 3 to 5 non-collinear outline points in the image of the part to be assembled, and the center coordinates of the part to be assembled are calculated.

9. A method for assembling a vacuum interrupter according to claim 6, characterized in that, The guidance information includes: a reference identifier representing the reference position, a real-time identifier representing the real-time position of the part to be assembled, and an allowed assembly area generated around the reference identifier based on a preset assembly precision.

10. A method for assembling a vacuum interrupter according to claim 9, characterized in that, The permitted assembly area is a ring-shaped area, and the color of the ring-shaped area changes dynamically depending on whether the real-time indicator is located inside it.

Images