Intelligent visual industrial component airtightness detection system

Abstract

The invention relates to the technical field of airtightness detection, and discloses an intelligent visual industrial component airtightness detection system, which comprises a cylinder for accommodating an industrial component, the wall of the cylinder is provided with an interlayer cavity, the inner wall of the cylinder on the inner side of the interlayer cavity is provided with a nozzle facing the industrial component, and the lower part of the cylinder is provided with a leak hole; the plugging piece is used for plugging the industrial component and the opening of the barrel; the gas conveying pipe penetrates through the plugging piece and is used for inputting high-pressure gas into the industrial component; the soapy water guide pipe, the clear water guide pipe and the air guide pipe are connected with the interlayer cavity and are used for respectively inputting soapy water, clear water and air into the interlayer cavity; valves are mounted on the air delivery pipe, the soapy water guide pipe, the clear water guide pipe and the air guide pipe; the camera is located on the side wall of the barrel and faces the industrial component; the device can inflate and pressurize the interior of the industrial component, and can respectively spray soapy water, clear water and air-drying airflow to the exterior of the industrial component under the condition of internal pressurization; therefore, after the soap bubble airtightness detection, the outer side of the industrial component can be quickly cleaned, and the internal pollution of the industrial component is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of airtightness detection, and in particular to an intelligent visual industrial component airtightness detection system. Background Art

[0002] The soap bubble method is a commonly used method for testing the air tightness of industrial components. It uses soapy water to form bubbles at the leak to determine whether there is a leak. When the industrial component being tested has poor airtightness, the internal gas will escape from the leak under pressure and come into contact with the soap solution applied to the outside to produce bubbles.

[0003] Traditional bubble recognition relies on manual visual skills, which can easily lead to missed detection or false detection. With the development of computer technology, machine vision provides a new technical idea for intelligent automatic detection of air tightness of industrial parts. Based on the traditional soap bubble method, machine vision is used to collect images to identify the bubbles at the leak point, thus realizing the air tightness detection of industrial parts. Compared with the existing artificial soap bubble method air tightness detection technology, intelligent visual detection is automatic and accurate.

[0004] However, the intelligent visual airtight detection system in the prior art does not have a cleaning and air-drying function. After the camera or camera captures the bubble image, a large amount of soapy water remains on the outside of the industrial parts and needs to be cleaned. The industrial parts need to be cleaned and wiped manually, which is time-consuming and labor-intensive. It is also easy to contaminate the inside of the industrial parts during cleaning, which seriously affects the efficiency of airtight detection. Summary of the invention

[0005] The purpose of the present invention is to provide an intelligent visual industrial component air tightness detection system in order to solve the above-mentioned problems in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions: Intelligent visual industrial component air tightness detection system, including: The cylinder is used to accommodate the industrial components. The cylinder wall has an interlayer cavity. The inner wall of the cylinder inside the interlayer cavity is provided with a plurality of nozzles facing the industrial components. The lower part of the cylinder is provided with a leakage hole penetrating the cylinder. Blocking pieces, used to block openings in industrial components and cylinders; A gas pipe, passing through the plugging piece, is used to input high-pressure gas into the industrial component; A soap water conduit, a clean water conduit and an air conduit connected to the interlayer cavity for respectively inputting soap water, clean water and air into the interlayer cavity; Valves are installed on the gas pipe, soap water pipe, clean water pipe and air pipe; The camera is located on the side wall of the cylinder and faces the industrial component.

[0007] Furthermore, the soapy water conduit, the clean water conduit and the air guide conduit independently transport the medium to the interlayer cavity in sequence.

[0008] Furthermore, when any of the soapy water conduit, the clean water conduit and the air guide conduit conveys the medium to the interlayer cavity, the air delivery pipe inputs high-pressure gas into the interior of the industrial component.

[0009] Furthermore, the interlayer cavity is connected with a four-way, and the soapy water conduit, the clean water conduit and the air duct are respectively connected with three ports of the four-way; and a heating device is connected in series on the air duct.

[0010] Furthermore, a collecting hopper corresponding to the leakage hole is provided at the lower side of the cylinder, and a waste liquid tank is provided at the lower side of the collecting hopper.

[0011] Furthermore, the soapy water conduit input end is provided with a soapy water tank, the clean water conduit input end is provided with a clean water tank, and the air duct input end is connected to an air pump; the upper ends of the soapy water tank and the clean water tank are both provided with water pumps for outputting the medium in the box.

[0012] Furthermore, a plurality of circular mounting plates are evenly arranged on the middle circumference of the cylinder body, and fill light and the camera are penetrated on the mounting plates, and the fill light emits light to the industrial parts; a brush body for cleaning the fill light and the camera is arranged on the inner side of the mounting plate, and a motor for driving the brush body to rotate is installed in the middle of the mounting plate.

[0013] Furthermore, two sealing members are provided, corresponding to the two ports of the cylinder respectively; the gas pipe passes through one of the sealing members; the sealing member includes a slide seat installed for linear sliding, a sealing ring corresponding to the cylinder is provided on the side of the slide seat facing the cylinder, a top column corresponding to the port of the industrial component is provided on the side of the slide seat facing the cylinder, a sealing gasket is provided on the outer end surface of the top column, and a center column passing through the sealing gasket is provided in the middle of the outer end surface of the top column.

[0014] Furthermore, it includes a plurality of guide rods for providing guidance for the linear sliding of the slide, the guide rods passing through the slide; and an automatic telescopic rod, which is parallel to the guide rods and has a telescopic end connected to the slide.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention can inflate and pressurize the industrial component, and can spray soapy water, clean water and air-dried airflow to the outside of the industrial component under the internal pressurization condition; therefore, after the soap bubble airtightness detection, the outside of the industrial component can be quickly cleaned and the internal contamination of the industrial component can be avoided; The cylinder surrounding the industrial component of the present invention cooperates with the plugging piece, has a compact structure, and limits the water consumption; the present invention is provided with an interlayer cavity and a plurality of nozzles, and can fully spray soapy water to complete a comprehensive inspection and fully clean the industrial component; The present invention heats the airflow of the air guide pipe by a heating device, thereby improving the air drying efficiency; the cleaning waste water leaking from the leakage hole can be collected by a collecting bucket and a waste liquid tank; The double sealing structure of the plugging piece of the present invention can simultaneously seal the cylinder and the opening of the industrial component; The present invention arranges a fill light in a closed environment to ensure stable light conditions; the brush body can clean the camera and the fill light after spraying soapy water, thereby ensuring clear and accurate image acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 It is a partial structural schematic diagram of the present invention.

[0018] Figure 3 It is a schematic diagram of the cylinder end structure of the present invention.

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the cylinder body of the present invention from the bottom side perspective.

[0020] Figure 5 It is a schematic diagram of the structure of the mounting plate of the present invention from the outer side viewing angle.

[0021] Figure 6 It is a schematic structural diagram of the inner side viewing angle of the mounting plate of the present invention.

[0022] In the figure: 1, cabinet; 2, ventilation hole; 3, cylinder; 4, blocking piece; 5, air pipe; 6, soap water conduit; 7, clean water conduit; 8, air duct; 9, camera; 10, fill light; 11, brush body; 12, motor; 13, collection bucket; 14, waste liquid tank; 15, heating device; 16, soap water tank; 17, clean water tank; 18, air pump; 19, guide rod; 20, automatic telescopic rod; 21, four-way; 31. Nozzle; 32. Leakage hole; 33. Mounting plate; 41. Sliding seat; 42. Sealing ring; 43. Top column; 44. Sealing gasket; 45. Center column. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" that may appear 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 an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Specific embodiments of the intelligent visual industrial component air tightness detection system provided by the present invention: See also Figure 1-6 , an intelligent visual industrial component air tightness detection system includes a cylinder 3, a sealing member 4, an air pipe 5 and a camera 9. The cylinder 3 is used to accommodate the industrial component. The wall of the cylinder 3 has an interlayer cavity. The inner wall of the cylinder 3 inside the interlayer cavity is provided with a plurality of nozzles 31 facing the industrial component. The lower part of the cylinder 3 is provided with a leakage hole 32 penetrating the cylinder 3. In this embodiment, the industrial component is a circular pipe segment.

[0027] In this embodiment, a cabinet 1 is provided, the front side of the cabinet 1 has a cabinet door, and the side wall of the cabinet 1 is provided with ventilation holes 2; the cylinder 3 is horizontally installed on the upper side of the cabinet 1, the rear edge of the upper side of the cabinet 1 is provided with a back panel, and the front side of the upper end of the back panel is connected to a horizontal top panel.

[0028] A collecting hopper 13 corresponding to the leakage hole 32 is provided on the lower side of the cylinder 3. The collecting hopper 13 passes through the upper wall of the cabinet 1. A waste liquid tank 14 is provided on the lower side of the collecting hopper 13. The waste liquid tank 14 is placed in the cabinet 1. The lower end of the collecting hopper 13 has an opening and extends to the inner side of the box opening of the waste liquid tank 14. The outer diameter of the lower end of the collecting hopper 13 is smaller than the inner diameter of the box opening of the waste liquid tank 14, so that the lower side of the collecting hopper 13 can be exhausted through the box opening of the waste liquid tank 14.

[0029] The plugging piece 4 is used to block the openings of the industrial component and the cylinder 3; two plugging pieces 4 are provided, corresponding to the two ports of the cylinder 3 respectively; the plugging piece 4 includes a slide seat 41 installed for linear sliding, and the sliding direction is parallel to and corresponding to the direction of the cylinder 3. The slide seat 41 is provided with a sealing ring 42 corresponding to the cylinder 3 on the side facing the cylinder 3, and the sealing ring 42 enables the slide seat 41 to seal the port of the cylinder 3; the slide seat 41 is provided with a top column 43 corresponding to the port of the industrial component on the side facing the cylinder 3, and a sealing gasket 44 is provided on the outer end surface of the top column 43. The top columns 43 and the sealing gasket 44 on both sides can clamp the two ends of the industrial component and seal the two ports of the industrial component. A central column 45 passing through the sealing gasket 44 is provided in the middle of the outer end surface of the top column 43, and the central column 45 can extend into the inner side of the industrial component. Before the top column 43 clamps the industrial component, one end of the industrial component is sleeved on the outside of the central column 45 of a plugging piece 4 to play a role of pre-support, and then the two plugging pieces 4 can be brought close to clamp the industrial component.

[0030] A plurality of guide rods 19 are provided on the upper side of the cabinet 1 to provide guidance for the linear sliding of the slide 41. Each slide 41 corresponds to at least two parallel guide rods 19, and the guide rods 19 slide through the slide 41. Two automatic telescopic rods 20 are installed on the upper side of the cabinet 1. The two automatic telescopic rods 20 correspond to the two blocking pieces 4 respectively. The automatic telescopic rod 20 is parallel to the guide rods 19, and its telescopic end is connected to the slide 41 of the corresponding blocking piece 4 to realize the translation drive of the corresponding blocking piece 4. In this embodiment, the automatic telescopic rod 20 is preferably a pneumatic telescopic rod.

[0031] The gas pipe 5 passes through a plugging member 4 to input high-pressure gas into the industrial component. Specifically, the output end of the gas pipe 5 passes through the central column 45 of the plugging member 4 to input high-pressure gas into the industrial component. The gas pipe 5 is a hose that can adapt to the translation of the plugging member 4.

[0032] In this embodiment, a soapy water conduit 6, a clean water conduit 7 and an air duct 8 are provided which are connected to the interlayer cavity and respectively input soapy water, clean water and wind into the interlayer cavity; independent valves are installed on the air supply pipe 5, the soapy water conduit 6, the clean water conduit 7 and the air duct 8; the interlayer cavity is connected to a four-way port 21, and the soapy water conduit 6, the clean water conduit 7 and the air duct 8 are respectively connected to the three ports of the four-way port 21.

[0033] A soap water tank 16 is provided at the input end of the soap water conduit 6, a clean water tank 17 is provided at the input end of the clean water conduit 7, and an air pump 18 is connected to the input end of the air duct 8; water pumps for outputting the medium in the soap water tank 16 and the clean water tank 17 are provided at the upper ends.

[0034] The soap water tank 16, the clean water tank 17 and the air pump 18 are all inside the cabinet 1, and the soap water conduit 6, the clean water conduit 7 and the air duct 8 all pass through the upper wall of the cabinet 1. The air delivery pipe 5 is connected to the output end of the air pump 18, and the air pump 18 supplies high-pressure gas to the air delivery pipe 5. The air pump 18 also supplies air-dried airflow to the air duct 8. In this embodiment, the air delivery pipe 5 is connected to the air duct 8, and the air duct 8 is used as an air source pipeline. The valve on the air duct 8 is located at one end of the air duct 8 close to the cylinder 3.

[0035] A heating device 15 is connected in series to the air duct 8. The heating device 15 includes a shell. The shell is connected in series to the air duct 8. An electric heating body is arranged in the shell. When the electric heating body is energized, it can heat the airflow passing through the heating device 15, thereby improving the air-drying efficiency.

[0036] The camera 9 is located on the side wall of the cylinder 3 and faces the industrial component; the camera 9 adopts a wide-angle lens; a plurality of circular mounting plates 33 are evenly arranged on the circumference of the middle part of the cylinder 3, and through holes are evenly arranged on the circumference of the middle part of the cylinder 3. The mounting plates 33 are sealed and embedded in the through holes, and the through holes and the leak holes 32 are not connected to the interlayer cavity. The mounting plate 33 is penetrated with a fill light 10 and a camera 9, and the fill light 10 emits light to the industrial component; a brush body 11 for cleaning the fill light 10 and the camera 9 is arranged on the inner side of the mounting plate 33, and a motor 12 for driving the brush body 11 to rotate is installed in the middle part of the mounting plate 33, and the output shaft of the motor 12 passes through the mounting plate 33 and is connected to the middle part of the brush body 11. The brush body 11 includes a hard rod body, and a rubber strip is arranged on the side of the rod body facing the mounting plate 33. The rotation range of the brush body 11 covers the camera 9 and the fill light 10, and the rubber strip can scrape off the dirt on the surface of the camera 9 and the fill light 10 during the rotation of the brush body 11.

[0037] The soapy water conduit 6, the clean water conduit 7 and the air duct 8 independently transport the medium to the interlayer cavity in sequence. When any of the soapy water conduit 6, the clean water conduit 7 and the air duct 8 transports the medium to the interlayer cavity, the air delivery pipe 5 inputs high-pressure gas into the industrial component. The industrial component is a round pipe segment. This embodiment provides an intelligent visual industrial component air tightness detection method, including the following steps: The industrial component is clamped in the cylinder 3 by using the plugging member 4, and the plugging member 4 seals the end opening of the cylinder 3 and the end opening of the industrial component respectively; The gas pipe 5 supplies high-pressure gas to the interior of the industrial component and keeps the interior of the industrial component in a high-pressure state; The soap water conduit 6 supplies soap water, which passes through the interlayer cavity of the cylinder 3 and is sprayed on the outside of the industrial component through the nozzle 31; The supply of soapy water stops, and the motor 12 drives the brush body 11 to work to clean the camera 9 and the fill light 10; the camera 9 collects images of the outer sides of several industrial parts; The clean water conduit 7 supplies clean water to the outside of the industrial component through the nozzle 31 for comprehensive cleaning; it should be noted that the clean water supply pressure should be higher than the soap water supply pressure; The supply of clean water stops, the air duct 8 supplies air flow, the heating device 15 is turned on, and hot air is ejected from the nozzle 31 to quickly dry the industrial parts; The soapy water, the water after cleaning and the hot air are discharged from the cylinder 3 through the leak hole 32, and the soapy water and the water after cleaning pass through the collection bucket 13 and fall into the waste liquid tank 14 for collection; The air supply pipe 5 stops supplying air, and then the air guide pipe 8 stops supplying air, and the heating device 15 is turned off, and then the blocking member 4 is moved away from the cylinder 3, and the clean industrial parts are taken out.

[0038] The computer processes a large number of images acquired by the camera 9; first, according to the dynamic growth characteristics of the bubble at the leak point, the traditional three-frame difference method is used to extract the leak point bubble contour image; in view of the problem that the traditional three-frame difference method has incomplete bubble contour extraction during the experiment, edge detection is used to complete the missing leak point bubble contour, and then the background image extracted by the ViBe algorithm is differentially calculated to obtain a complete leak point bubble contour image. Finally, the leak point specimen is simulated to simulate leak points in various situations, and the effectiveness of the improved inter-frame difference algorithm proposed in this paper is verified by comparing it with the existing moving target detection algorithm.

[0039] Motion bubble detection is the key to determine whether the workpiece to be tested is leaking. In order to improve the efficiency of air tightness detection of gas industry parts, the traditional three-frame difference method has partial overlap and incomplete contours in the process of moving target detection. The improved three-frame difference method combining Kirsch edge detection and background difference is adopted. The algorithm firstly differs three consecutive frames of images to obtain the motion area, and then performs Kirsch edge detection on the current frame. The obtained motion area is logically "or" operated with the edge detection result to obtain the complete motion target, and the background frame difference method is used to segment the moving target and remove noise. Finally, the motion target detection performance of the algorithm is verified by actual bubble images.

[0040] The mechanical analysis of the leak point bubbles in the air is carried out to explain the phenomenon of bubble growth from a mechanical perspective, and the offset growth law of the leak point bubbles in actual scenes is summarized through a large number of experiments. Then, based on the circular feature of the bubble contour, the leak point bubble contour is identified by the circle detection algorithm to realize the positioning of the leak point area of ​​the simulated specimen. In order to quickly and accurately locate the leak point area, considering the requirements of air tightness detection on the detection speed, the Hough circle detection frequently calculates the distance from the point on the circle contour to the center of the circle. The area range defined by the circle and the inscribed and circumscribed rectangles is used to judge the pixel points on the circle. If the pixel point is not within the area range, it can be directly screened out, thereby improving the detection speed of the algorithm. Secondly, considering that the least squares method has errors when fitting multiple targets, it is combined with the circular constraint CV algorithm. The bubble contours in the bubble image are detected one by one by iterating the constraint coefficients in the circular constraint CV algorithm, and the iterative removal method is used to eliminate the interference of the internal edge of the moving bubble, thereby improving the accuracy of the least squares method for circle fitting.

[0041] Aiming at the problem that the growth deviation of the bubble at the leakage point leads to the decrease of the positioning accuracy of the leakage point area, a large number of experiments are conducted to summarize the deviation law of the leakage point bubble, and an improved image search algorithm is proposed. Under the premise of ensuring the integrity of the moving bubble contour at the leakage point, the bubble image with the smallest deviation of the bubble center from the leakage point is found for processing, so as to improve the accuracy of the leakage point area positioning.

[0042] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. Intelligent visual industrial component air tightness detection system, characterized by: include: The cylinder (3) is used to accommodate the industrial component. The wall of the cylinder (3) has an interlayer cavity. The inner wall of the cylinder (3) inside the interlayer cavity is provided with a plurality of nozzles (31) facing the industrial component. The lower part of the cylinder (3) is provided with a leakage hole (32) penetrating the cylinder (3); A plugging member (4) for plugging the opening between the industrial component and the cylinder (3); A gas delivery pipe (5) passing through the plugging member (4) and used for delivering high-pressure gas into the industrial component; A soapy water conduit (6), a clean water conduit (7) and an air conduit (8) connected to the interlayer cavity for respectively inputting soapy water, clean water and air into the interlayer cavity; Valves are installed on the gas delivery pipe (5), the soapy water pipe (6), the clean water pipe (7) and the air guide pipe (8); The camera (9) is located on the side wall of the cylinder (3) and faces the industrial component.

2. The intelligent visual industrial component air tightness detection system according to claim 1 is characterized in that: The soapy water conduit (6), the clean water conduit (7) and the air guide duct (8) independently and sequentially transport the medium to the interlayer cavity.

3. The intelligent visual industrial component air tightness detection system according to claim 2 is characterized in that: When any of the soapy water conduit (6), the clean water conduit (7) and the air guide pipe (8) transports a medium into the interlayer cavity, the air delivery pipe (5) inputs high-pressure gas into the interior of the industrial component.

4. The intelligent visual industrial component air tightness detection system according to claim 1, characterized in that: The interlayer cavity is connected to a four-way pipe (21); the soapy water conduit (6), the clean water conduit (7) and the air duct (8) are respectively connected to three ports of the four-way pipe (21); and a heating device (15) is connected in series to the air duct (8).

5. The intelligent visual industrial component air tightness detection system according to claim 1, characterized in that: A collecting hopper (13) corresponding to the leak hole (32) is provided on the lower side of the cylinder (3), and a waste liquid tank (14) is provided on the lower side of the collecting hopper (13).

6. The intelligent visual industrial component air tightness detection system according to claim 1, characterized in that: The input end of the soapy water conduit (6) is provided with a soapy water tank (16), the input end of the clean water conduit (7) is provided with a clean water tank (17), and the input end of the air guide pipe (8) is connected to an air pump (18); the upper ends of the soapy water tank (16) and the clean water tank (17) are both provided with water pumps for outputting the medium in the tanks.

7. The intelligent visual industrial component air tightness detection system according to claim 1, characterized in that: A plurality of circular mounting plates (33) are evenly arranged on the circumference of the middle of the cylinder (3); a fill light (10) and the camera (9) are mounted on the mounting plates (33); the fill light (10) emits light to the industrial component; a brush body (11) for cleaning the fill light (10) and the camera (9) is arranged on the inner side of the mounting plate (33); and a motor (12) for driving the brush body (11) to rotate is mounted in the middle of the mounting plate (33).

8. The intelligent visual industrial component air tightness detection system according to claim 1, characterized in that: The blocking member (4) is provided with two, respectively corresponding to the two ports of the cylinder (3); the gas transmission pipe (5) passes through one of the blocking members (4); the blocking member (4) comprises a slide seat (41) which is installed in a linear sliding manner; a sealing ring (42) corresponding to the cylinder (3) is provided on the side of the slide seat (41) facing the cylinder (3); a top column (43) corresponding to the port of the industrial component is provided on the side of the slide seat (41) facing the cylinder (3); a sealing gasket (44) is provided on the outer end surface of the top column (43); and a center column (45) passing through the sealing gasket (44) is provided in the middle of the outer end surface of the top column (43).

9. The intelligent visual industrial component air tightness detection system according to claim 8, characterized in that: The invention comprises a plurality of guide rods (19) for providing guidance for the linear sliding of the slide seat (41), wherein the guide rods (19) pass through the slide seat (41); and an automatic telescopic rod (20) which is parallel to the guide rods (19) and has a telescopic end connected to the slide seat (41).

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