Cast pipe end face identification recognition system and processing method

Abstract

The invention relates to a cast pipe end face identification recognition system and a processing method. A socket facade; a pipe number; the light source is light which is arranged on the outer side of the axis of the cast pipe and faces the axis direction of the cast pipe, the light source irradiates the pipe number in a flash mode, and the axis of the cast pipe, the socket vertical face and the light source are sequentially arranged; a camera; according to the cast pipe end face identification recognition system, the light source, the pipe number and the camera are arranged in sequence through the position change of the cast pipe or the light source, and the light source is a single-side light source when irradiating the pipe number; the processing system has the beneficial effects that under the position relation that the light source, the pipe number and the camera are arranged in sequence, the processing system of the cast pipe end face identification recognition system for obtaining high-contrast pipe number information by using the single lateral light source is provided, the adverse effect of bell mouth vertical face abrasion on pipe number recognition is overcome in the nodular cast iron pipe machining process, and the processing efficiency is improved. The recognition rate is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of special equipment for ductile cast iron pipe processing, and particularly relates to a cast pipe end face marking identification system and a processing method in a quality traceability process. BACKGROUND

[0002] Quality traceability refers to recording the inspection results and existing problems, recording the names, times, places and situation analysis of operators and inspectors, and making corresponding quality state marks at appropriate parts of the product in the production process. These records and marked products are synchronized. In the production and use process of ductile cast iron pipes, quality traceability is also needed to improve product quality, mark production information, and avoid the adverse competition of inferior coins driving out good coins. The applicant has carried out a large amount of research on quality traceability in the past, for example, a cast pipe quality traceability method and traceability system CN201910804651.9, which describes the use of cast characters to mark product information. At the same time, since there are many ways of marking, the inventor has recently realized the use of laser etching technology to mark and identify cast pipes, for example, a ductile cast iron pipe laser deep carving device CN202320031476.6 and a ductile cast iron pipe socket marking identification device CN202321285743.9, which mark the end face of the cast pipe socket through the technology of etching technology, in order to achieve the purpose of quality traceability in the production and use process.

[0003] However, the inventor found in the study of the prior art that, even in the process of using laser deepening, due to the need for production rhythm and product quality, the etching depth is often between 1mm and 3mm, and in the production process of the product, the need for single-sided work position centering, processing position standardization, and production process limitation will all cause wear on the socket facade, resulting in a decrease in the cleanliness of the end face. Under such working conditions, the contrast between the laser engraved characters and the end face metal matrix is significantly weakened, not only difficult for the human eye to identify, but also greatly difficult for machine automatic identification. At this time, the recognition rate of the automatic equipment will decrease, and the decrease in the recognition rate will greatly affect the establishment of production automation and quality traceability system. The existing conventional identification scheme often fails in such low-contrast environment, seriously restricting the digitalization process of the production line.

[0004] Therefore, a cast pipe end face marking identification system and a processing method are urgently needed. SUMMARY

[0005] In order to overcome the problem of the decline of the recognition rate of the sunken mark in the prior art, the inventor finds through a large number of experiments that the light source arranged on the side improves the definition in the whole recognition process, but has a negative effect on the contrast of the sunken mark on the end face of the socket, so the inventor adopts the overall inventive concept of using a single flash light source to improve the contrast of the picture by using the shadow effect of the sunken mark. Although the abrasion of the end face of the socket will cause the contrast of the characters to decrease, in the opposite direction, the abrasion will also improve the brightness under the irradiation of the single flash light source, thereby indirectly highlighting the contrast of the sunken mark. The technical scheme adopted by the present application is as follows: a cast pipe end face mark recognition system comprises:

[0006] The cast pipe is a socket type nodular cast iron pipe, and the cast pipe comprises a socket.

[0007] The socket face is an annular face located at the end of the socket and perpendicular to the axis of the cast pipe.

[0008] The pipe number is a mark sunken on the socket face and composed of a plurality of letters and / or numbers.

[0009] Further comprising:

[0010] The light source is light arranged outside the axis of the cast pipe and directed towards the axis of the cast pipe. The light source irradiates the pipe number in the form of flash, and the axis of the cast pipe, the socket face and the light source are arranged in sequence.

[0011] The camera is an industrial camera located outside or on the axis of the cast pipe and used to acquire image information of the socket face. The projection of the camera on the plane where the socket face is located is located inside the socket face.

[0012] The cast pipe end face mark recognition system changes the position of the cast pipe or the light source to arrange the light source, the pipe number and the camera in sequence, and the light source is a single light source when irradiating the pipe number.

[0013] The processing system processes the image information of the pipe number acquired by the camera.

[0014] Further comprising:

[0015] The support assembly is a rigid support member for fixing the light source and the camera, and the support assembly comprises:

[0016] The bracket is a frame body with a mounting surface facing the socket face, and the light source is fixedly connected to the bracket.

[0017] The linear drive is fixedly connected to the support assembly at a fixed end and connected to the bracket at a telescopic end to drive the bracket to move close to or away from the socket face.

[0018] Further,

[0019] The angle between the irradiation point of the light source and the image receiving site of the camera and the side surface of the socket is 10 to 30 degrees.

[0020] Further, it also includes:

[0021] The support is a device for supporting the side surface of the socket vertically to the horizontal plane and towards the bracket.

[0022] Further,

[0023] The support includes two or more than two groups of supporting wheels and blocking wheels on the side of the socket, and the supporting wheels drive the cast pipe to rotate around the axis.

[0024] The light source is located on one side of the side surface of the socket, and the camera acquires four or more than four groups of image information of the side surface of the socket in the process of flashing of the light source during the rotation of the cast pipe, and the processing system acquires the pipe number information.

[0025] Further,

[0026] The support is a non-driven track containing V-shaped supporting grooves, and the cast pipe is statically seated in the V-shaped supporting grooves.

[0027] The light sources are distributed equidistantly around the cast pipe by means of the bracket, and the number of the light sources is four or more than four.

[0028] The camera acquires image information of the side surface of the socket equal to the number of the light sources in the process of flashing of any of the light sources, and the processing system acquires the pipe number information.

[0029] Further,

[0030] The support is a non-driven track containing V-shaped supporting grooves, and the cast pipe is statically seated in the V-shaped supporting grooves.

[0031] The bracket is a circular ring type, and the inside is provided with a drive, which can rotate around the axis of the cast pipe as the center, and the light sources rotate synchronously by means of the bracket.

[0032] The camera acquires image information of the side surface of the socket in the process of flashing of the light source, and the processing system acquires the pipe number information.

[0033] The light source flashes more than four times in one rotation.

[0034] Further,

[0035] The pipe number is engraved on the side surface of the socket by means of laser etching.

[0036] A processing method of a processing system of a cast pipe end face mark identification system, comprising the following methods:

[0037] Storing image information corresponding to the pipe number in the processing system;

[0038] The processing system obtains more than four groups of the socket facade image information obtained by the camera;

[0039] The processing system compares the socket facade image information with the image information corresponding to the pipe number stored in the processing system;

[0040] The processing system compares the pipe number image information with the highest confidence;

[0041] The processing system outputs the pipe number.

[0042] Further, the following methods are further included:

[0043] The processing system stores image information of letters or numbers corresponding to the pipe number in the processing system;

[0044] When the processing system analyzes the pipe number image information in the socket facade image information, the pipe number image information is compared with the image information of letters or numbers corresponding to the pipe number stored in the processing system;

[0045] The processing system obtains the letters or numbers in the pipe number image information with the highest confidence;

[0046] The processing system compares the pipe number obtained by the processing system after comparing the pipe number image information with the highest confidence, according to the pipe number composed of the letters or numbers in the pipe number image information with the highest confidence;

[0047] If the comparison is consistent, the processing system outputs the pipe number;

[0048] If the comparison is inconsistent, the cast pipe end face mark identification system collects the socket facade image information again, and repeats the above steps or alarms.

[0049] The present application has the following advantages over the prior art:

[0050] 1. In the light source, pipe number, and camera sequential arrangement position relationship, a cast pipe end face mark identification system processing system is proposed, which uses a single lateral light source to obtain high-contrast pipe number information, and realizes the pipe number identification in the process of nodular cast iron pipe processing, overcomes the adverse effects of socket facade wear on pipe number identification, and improves the identification rate.

[0051] 2. Three different design structures of the system are proposed to realize the sequential arrangement position relationship of the light source, the pipe number, and the camera.

[0052] 3. The processing method of the processing system of the cast pipe end face marking recognition system based on the above technical solutions. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 The specific embodiment of the present application is a pipe number marking method.

[0054] Figure 2 The specific embodiment of the present application is a schematic diagram of the position relationship of the light source, the pipe number, and the camera.

[0055] Figure 3 The specific embodiment of the present application is a schematic diagram of the position relationship of the support assembly and the socket facade.

[0056] Figure 4 The specific embodiment of the present application is a schematic diagram of the support displacement method.

[0057] Figure 5 The specific embodiment of the present application is an axial view of the processing system of the first cast pipe end face marking recognition system.

[0058] Figure 6 The specific embodiment of the present application is an axial view of the processing system of the second cast pipe end face marking recognition system.

[0059] Figure 7 The specific embodiment of the present application is an axial view of the processing system of the third cast pipe end face marking recognition system.

[0060] The annotations are as follows:

[0061] 100 - cast pipe; 110 - socket facade;

[0062] 200 - pipe number; 300 - light source; 400 - camera;

[0063] 500 - support assembly; 510 - support; 520 - linear drive;

[0064] 600 - support; 700 - processing system; DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments are clearly and completely described. Apparently, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of 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 of the present application.

[0066] In order to overcome the problem of reduced recognition rate of the sunken mark in the prior art, the inventor found through a large number of experiments that the light source arranged on the side improves the clarity in the overall recognition process, but has a negative impact on the contrast of the sunken mark on the end face of the socket. Therefore, the inventor adopts a single-sided flash light source to improve the contrast of the picture by using the shadow effect of the sunken mark. Although the wear of the end face of the socket will cause the contrast of the characters to decrease, the wear will also improve the brightness under the irradiation of the single-sided flash light source, thereby indirectly highlighting the contrast of the sunken mark. Please refer to Figures 1 to 7 , the specific implementation is: Figure 1 and Figure 2 A cast pipe end face mark recognition system, comprising:

[0067] The cast pipe 100 is a socket type ductile iron pipe, and the cast pipe 100 comprises a socket;

[0068] The socket face 110 is an annular face located at the end of the socket and perpendicular to the axis of the cast pipe 100;

[0069] The pipe number 200 is a mark sunken on the socket face 110 and composed of a plurality of letters and / or numbers. It should be noted that Figure 1 When etching the end face of the small-sized cast pipe 100, the font needs to be arranged with a certain radian along the arc of the socket face 110.

[0070] Further comprising:

[0071] The light source 300 is light arranged outside the axis of the cast pipe 100 and directed towards the axis of the cast pipe 100. The light source 300 irradiates the pipe number 200 in the form of flash, and the axis of the cast pipe 100, the socket face 110 and the light source 300 are arranged in sequence;

[0072] Camera 400, industrial camera for obtaining image information of the bell mouth facade 110, located outside or on the axis of the casting pipe 100, the projection of the position of the camera 400 in the plane of the bell mouth facade 110 is located inside the bell mouth facade 110;

[0073] The casting pipe end face identification recognition system changes the position of the casting pipe 100 or the light source 300, so that the light source 300, the pipe number 200 and the camera 400 are arranged in sequence, and the light source 300 is a single-sided light source when irradiating the pipe number 200.

[0074] The processing system 700 processes the image information of the pipe number 200 obtained by the camera 400.

[0075] The inventor found in the prior art that only single-sided light near the pipe number 200 side can obtain optimal image information, so in order to realize this mode, cooperate with the conventional etching requirement that the pipe number 200 is a circumferential identification on the bell mouth facade 110, use the light source 300 on one side and the camera 400 on the other side to realize the acquisition of high-contrast images, so as to improve the recognition rate.

[0076] In some embodiments, please refer to Figure 3 And Figure 4 In order to control the inclination angle of the light source 300 and improve the shooting effect of the shadow effect, further comprising:

[0077] The support assembly 500 is a rigid support for fixing the light source 300 and the camera 400, and the support assembly 500 comprises:

[0078] The bracket 510 is a frame body with a mounting surface facing the bell mouth facade 110, and the light source 300 is fixedly connected to the bracket 510;

[0079] The linear drive 520 has a fixed end connected to the support assembly 500 and a telescopic end connected to the bracket 510, and drives the bracket 510 to approach or away from the bell mouth facade 110.

[0080] In some embodiments, please refer to Figure 4 The inclination angle is adjusted by using the linear drive 520.

[0081] The angle between the irradiation point of the light source 300 and the image receiving part of the camera 400 and the bell mouth facade 110 is ten to thirty degrees. The inventor found in research and experiment that the larger the inclination angle, the better the effect, and the larger the inclination angle, the lower the exposure, the lower the reflected light, and the overall effect is dark. After comparison, the recognition rate is best between ten to thirty degrees.

[0082] In other embodiments, based on the inventive concept, the inventors provide various implementations, which also include:

[0083] The support 600 is a device for supporting the socket facade 110 perpendicular to the horizontal plane and facing the support 510.

[0084] Referring to Figure 5 , the first embodiment is:

[0085] The support 600 includes two or more groups of supporting wheels and blocking wheels located on the side of the socket. The supporting wheels drive the cast pipe 100 to rotate around the axis.

[0086] The light source 300 is located on one side of the socket facade 110. During the rotation of the cast pipe 100, the camera 400 acquires four or more groups of image information of the socket facade 110 during the flashing of the light source 300, and the processing system 700 acquires the pipe number 200 information. In this embodiment, the position of the single-sided light source 300 is fixed, the cast pipe 100 is rotated by the supporting wheels, the position of the pipe number 200 is changed, and the image information closest to the light source 300 is found. To obtain the image information with the optimal contrast. Of course, in some embodiments, the position of the pipe number 200 can be obtained by the visual system first, and then the pipe number 200 is rotated by the supporting wheels to approach the light source.

[0087] Referring to Figure 6 , the second embodiment is:

[0088] The support 600 is a non-driven track containing a V-shaped supporting groove, and the cast pipe 100 is statically seated in the V-shaped supporting groove.

[0089] The light source 300 is equally spaced around the cast pipe 100 by the support 510, and the number of light sources 300 is four or more.

[0090] The camera 400 acquires image information of the socket facade 110 equal to the number of light sources 300 during the flashing of any light source 300, and the processing system 700 acquires the pipe number 200 information.

[0091] In this embodiment, the light sources 300 are arranged at different positions around the cast pipe 100. The light sources 300 flash in sequence or separately to obtain image information corresponding to the light sources 300. Then, the image with high contrast or the pipe number 200 close to the light source 300 is obtained to improve the recognition rate.

[0092] Referring to Figure 7 , the third embodiment is:

[0093] The support 600 is a non-driven track containing a V-shaped bracket, and the cast pipe 100 is statically seated in the V-shaped bracket;

[0094] The support 510 is a circular ring type, and is internally provided with a drive, and can rotate with the axis direction of the cast pipe 100 as the center, and the light source 300 is synchronously rotated by means of the support 510;

[0095] The camera 400 acquires the image information of the socket facade 110 during the flashing of the light source 300, and acquires the pipe number 200 information by means of the processing system 700;

[0096] The light source 300 flashes more than four times in one rotation.

[0097] In the embodiment, the light source 300 rotates, and different images are obtained at different positions to obtain images with high contrast.

[0098] The above three embodiments can obtain multiple groups of pictures, and after comparison, images with high recognition rate can be obtained, thereby overcoming the problems in the prior art.

[0099] In some embodiments,

[0100] The pipe number 200 is engraved on the socket facade 110 by means of laser etching. Of course, there are many ways to engrave the pipe number 200, such as dotting or using a mold, which can also be obtained.

[0101] On the basis of the above embodiments, a processing method of the processing system of the cast pipe end face identification system is provided, which comprises the following methods:

[0102] The processing system 700 stores the image information corresponding to the pipe number 200;

[0103] The processing system 700 acquires four groups of image information of the socket facade 110 obtained by the camera 400;

[0104] The processing system 700 compares the image information of the socket facade 110 with the image information corresponding to the pipe number 200 stored in the processing system 700;

[0105] The processing system 700 compares the pipe number 200 image information with the highest confidence;

[0106] The processing system 700 outputs the pipe number 200.

[0107] In the comparison process, each image information or image element, such as C, can be obtained, and in the image acquisition process, it is possible to misjudge as O or 0. In the system corresponding to the embodiment, first, the multiple groups of images can effectively overcome the misjudgment, and second, the inventors found in experiments that unilateral light, especially the pipe number 200 close to the light source 300, has high image definition and is not easy to be misjudged, thereby improving the identification efficiency. Because the uniform distribution of the surrounding light produces images that are consistent, there is no comparable information, and misjudgment occurs.

[0108] In some other embodiments, the method preferably further comprises the following steps:

[0109] The processing system 700 stores the image information of the corresponding letters or numbers of the pipe number 200;

[0110] When the processing system 700 analyzes the pipe number 200 image information in the bell surface 110 image information, the pipe number 200 image information is compared with the image information of the corresponding letters or numbers of the pipe number 200 stored in the processing system 700;

[0111] The processing system 700 obtains the letters or numbers in the pipe number 200 image information with the highest confidence;

[0112] The processing system 700 compares the pipe number 200 composed of the letters or numbers in the pipe number 200 image information with the highest confidence with the pipe number 200 obtained by the processing system 700 after comparing the pipe number 200 image information with the highest confidence;

[0113] If the comparison is consistent, the processing system 700 outputs the pipe number 200;

[0114] If the comparison is inconsistent, the cast pipe end face identification system collects the bell surface 110 image information again and repeats the above steps or alarms.

[0115] Specific operation: pipe number 200 is engraved on the spout vertical surface 110 of the cast pipe 100 at the upstream station, when it reaches the station, the light source 300 is arranged on the outside of the cast pipe 100, that is, the side of the pipe number 200, the camera 400 is arranged at the outer extension of the hollow position of the ring of the spout vertical surface 110, so that a group of images will inevitably appear during the shooting process, and the positional relationship is that the two sides of the pipe number 200 are one light source 300 and one camera 400. With the three structures provided in the embodiments, the above pictures can be obtained. Even if the light source 300 is fixed, for example, the second embodiment, a group of pictures close to the light source 300 close to the pipe number 200 can be obtained, so that the recognition rate is improved by virtue of the high contrast characteristics of the side single light source under the illumination of the engraved pipe number 200. At the same time, on the basis of the embodiment, the processing method can effectively improve the accuracy of image recognition.

[0116] The beneficial effects of the prior art are:

[0117] 1. In the light source, pipe number, camera sequential arrangement position relationship, a cast pipe end face identification recognition system is provided, which uses a lateral single light source to obtain high-contrast pipe number information, so as to overcome the adverse effects of spout vertical surface wear on pipe number recognition in the process of nodular cast iron pipe processing, and improve the recognition rate.

[0118] 2. Three different design structures of the system are provided to realize the sequential arrangement position relationship of the light source, the pipe number and the camera.

[0119] 3. On the basis of the above technical scheme, a processing method of the processing system of the cast pipe end face identification recognition system is provided.

[0120] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A cast pipe end face identification system, comprising: The cast pipe (100) is a socket-and-spigot type ductile iron pipe, and the cast pipe (100) includes a socket; The bell mouth vertical surface (110) is an annular surface located at the end of the bell mouth and perpendicular to the axis of the casting pipe (100); The pipe number (200) is an identification mark composed of a plurality of letters and / or numbers and is engraved on the socket facade (110); It is characterized by further comprising: The light source (300) is arranged outside the axis of the cast pipe (100) and faces the axis of the cast pipe (100). The light source (300) illuminates the pipe number (200) in the form of flashing light, and the axis of the cast pipe (100), the socket vertical surface (110), and the light source (300) are arranged in sequence. The camera (400) is an industrial camera located outside or on the axis of the cast pipe (100) and is used to obtain image information of the bell mouth facade (110). The projection of the camera (400) on the plane where the bell mouth facade (110) is located is located inside the bell mouth facade (110). The cast pipe end face identification system changes the position of the cast pipe (100) or the light source (300), so that the light source (300), the pipe number (200), and the camera (400) are arranged in sequence, and the light source (300) is a single-sided light source when illuminating the pipe number (200); A processing system (700) processes the image information of the tube number (200) acquired by the camera (400).

2. The cast pipe end face identification system according to claim 1, characterized in that: Also includes: The support assembly (500) is a rigid support member for fixing the light source (300) and the camera (400), and the support assembly (500) includes: The bracket (510) is a frame body with its mounting surface facing the socket vertical surface (110), and the light source (300) is fixedly connected to the bracket (510); A linear drive (520) has a fixed end connected to the support assembly (500) and a telescopic end connected to the bracket (510), driving the bracket (510) to move closer to or away from the socket facade (110).

3. The cast pipe end face identification system according to claim 2, characterized in that: The angle between the illumination point of the light source (300) and the image receiving portion of the camera (400) and the socket facade (110) is 10 to 30 degrees.

4. The cast pipe end face identification system according to claim 2, characterized in that: Also includes: The support (600) is a device that supports the socket vertical surface (110) perpendicular to the horizontal plane and faces the bracket (510).

5. The cast pipe end face identification system according to claim 4, characterized in that: The support (600) comprises: two or more sets of supporting wheels and a blocking wheel located on the side of the socket, wherein the supporting wheels drive the casting pipe (100) to rotate around the axis; The light source (300) is located on one side of the bell mouth facade (110). During the rotation of the cast pipe (100), the camera (400) obtains more than four groups of image information of the bell mouth facade (110) during the flashing of the light source (300), and obtains the pipe number (200) information with the help of the processing system (700).

6. The cast pipe end face identification system according to claim 4, characterized in that: The support (600) is a non-driven track with a V-shaped bracket, and the casting pipe (100) is stationarily seated in the V-shaped bracket; The light sources (300) are distributed at equal intervals around the casting pipe (100) by means of the bracket (510), and the number of the light sources (300) is four or more groups; The camera (400) acquires image information of the socket facade (110) equal to the number of the light sources (300) during the flashing process of any of the light sources (300), and acquires the pipe number (200) information with the help of the processing system (700).

7. The cast pipe end face identification system according to claim 4, characterized in that: The support (600) is a non-driven track with a V-shaped bracket, and the casting pipe (100) is stationarily seated in the V-shaped bracket; The bracket (510) is annular and has a drive disposed therein, capable of rotating with the axis of the casting pipe (100) as the center of the circle, and the light source (300) rotates synchronously with the bracket (510); The camera (400) acquires image information of the socket facade (110) during the flashing process of the light source (300), and acquires the pipe number (200) information with the aid of the processing system (700); The light source (300) flashes more than four times within one rotation.

8. The cast pipe end face identification system according to any one of claims 1 to 7, characterized in that: The pipe number (200) is engraved on the socket facade (110) by laser etching.

9. The processing method of the processing system of the cast pipe end face identification system according to any one of claims 5 to 7, characterized in that: Includes the following methods: The processing system (700) stores image information corresponding to the tube number (200); The processing system (700) obtains four or more sets of image information of the socket facade (110) obtained by the camera (400); The processing system (700) compares the image information of the socket elevation (110) with the image information corresponding to the pipe number (200) stored in the processing system (700); The processing system (700) compares and obtains a group of image information of the tube number (200) with the highest confidence; The processing system (700) outputs the tube number (200).

10. The processing method of the processing system according to claim 9, characterized in that: Also includes the following methods: The processing system (700) stores image information of letters or numbers corresponding to the tube number (200); When the processing system (700) analyzes the pipe number (200) image information in the socket elevation (110) image information, the pipe number (200) image information is compared with the image information of letters or numbers corresponding to the pipe number (200) stored in the processing system (700); The processing system (700) obtains the letter or number in the image information of the tube number (200) with the highest confidence; The processing system (700) compares the tube number (200) composed of letters or numbers in the tube number (200) image information with the highest confidence with the tube number (200) obtained by comparing a group of tube number (200) image information with the highest confidence by the processing system (700); If the comparison is consistent, the processing system (700) outputs the pipe number (200); If the comparison is inconsistent, the cast pipe end face identification system collects the bell mouth facade (110) image information again and repeats the above steps or issues an alarm.

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