Sealing structure, flange plate detection device and working method thereof

Abstract

The present application belongs to the technical field of engineering elements, and particularly relates to a seal, especially to a seal structure, a flange plate detection device and a working method thereof; wherein one kind of seal structure is applied to the seal of an injection port of a flange plate, and comprises: a flange plate, an outer wall of which is axially provided with a positioning groove, and a side wall of the positioning groove is radially provided with an injection port; a head which is matched with the injection port; and a sealing ring which is sleeved on the outer wall of the head and has a trapezoidal cross section; wherein, in the process of inserting the head into the injection port, the head is inclined relative to the horizontal plane to avoid the axial overturning of the sealing ring located on the upper surface of the head in the inserting process. Through the head which can be inclined and the sealing ring with the trapezoidal cross section, in the process of inserting the head into the injection port, the head is inclined relative to the horizontal plane so as to facilitate the synchronous insertion of the sealing ring into the injection port along with the head.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engineering elements, and particularly relates to sealing, and especially relates to a sealing structure, a flange plate detection device and a working method thereof. BACKGROUND

[0002] In a high-voltage gas insulated switchgear (GIS), a flange plate is a key sealing component, and a side wall of the flange plate is provided with an injection port in a radial direction for resin injection. After the flange plate and an insulating pot are integrally installed to the GIS, resin is injected into an inner ring of the flange through the injection port to fill a gap between the devices and form a permanent seal. After the resin is solidified, a sealing head is used to plug the injection port to ensure that the GIS cavity is sealed for a long time under the rated gas pressure.

[0003] In the related art, the sealing head sealing method has the following defects:

[0004] When a sealing ring is sleeved on an outer wall of a conventional sealing head, the sealing ring is easily separated from the outer wall of the sealing head due to extrusion. Further, in order to facilitate insertion, the outer diameter of the sealing head is designed to be slightly smaller than the inner diameter of the waist-shaped hole (the gap is about 0.1-0.3 mm), which causes the sealing ring to rotate in the axial direction when the sealing ring is pressed and deformed during the insertion process, resulting in uneven pressure on the sealing surface.

[0005] The above problems cause assembly difficulties, and the sealing ring is easily turned over due to extrusion, which increases the leakage rate and affects the long-term sealing reliability of the GIS.

[0006] Therefore, it is urgent to solve the assembly difficulty of the sealing ring when inserted into the inner wall of the injection port and to ensure uniform pressure on the sealing surface, which is a technical problem that needs to be solved in the field.

[0007] It should be noted that the above information disclosed in the background section of the present application is only used to understand the background of the present application, and therefore, the above description is not considered to constitute the information of the related art. SUMMARY

[0008] The present disclosure at least provides a sealing structure, a flange plate detection device and a working method thereof.

[0009] In a first aspect, the present disclosure provides a sealing structure applied to an injection port sealing of a flange plate, comprising:

[0010] a flange plate, an outer wall of which is provided with a positioning groove in an axial direction, and a side wall of the positioning groove is provided with an injection port in a radial direction;

[0011] a sealing head adapted to the injection port;

[0012] a sealing ring sleeved on an outer wall of the sealing head and having a trapezoidal cross section;

[0013] When the head is inserted into the injection port, the head is tilted relative to the horizontal plane to prevent the sealing ring located on the upper surface of the head from axially flipping during the insertion process.

[0014] In an optional embodiment, the trapezoidal slope of the sealing ring faces the insertion direction of the head.

[0015] In a second aspect, an embodiment of the present disclosure further provides a flange detection device for detecting the insertion of a flange and a head in an auxiliary sealing structure into an injection port, comprising:

[0016] A workbench, on which a positioning assembly is slidably arranged, wherein the positioning assembly is suitable for driving the flange to rotate circumferentially;

[0017] A detection component is slidably arranged above the positioning component;

[0018] The detection component includes:

[0019] Detection column;

[0020] The positioning ring and the lifting sleeve are arranged on the outer wall of the detection column and are suitable for abutting against the surface of the flange;

[0021] A protective cover is sleeved on the bottom outer wall of the detection column;

[0022] The limiting piece is slidably arranged in a groove provided on the circumference of the bottom of the detection column;

[0023] An elastic member, located inside the limiting plate and used to drive the limiting plate to move outward;

[0024] The detection column moves downward until the positioning ring abuts against the surface of the flange, and the flange rotates relative to the detection column. The positioning ring is suitable for detecting whether there is a protrusion on the surface of the flange;

[0025] The positioning ring moves downward and abuts against the surface of the head, so that the head is tilted relative to the horizontal plane;

[0026] After the positioning ring moves downward, the protective sleeve changes from a tightened state to a relaxed state, and the elastic member pushes the limiting plate to slide outward and abut against the lower bottom surface of the head to limit the sealing ring.

[0027] In an optional embodiment, the lower surface of the positioning ring is provided with an inclined surface;

[0028] After the positioning ring contacts the surface of the head, the flange continues to rotate, and the inclined surface is suitable for guiding the positioning ring to escape from the positioning groove.

[0029] In an optional embodiment, the protective cover is elastic;

[0030] When the positioning ring moves downward, the limiting piece pushes the protective cover to bulge outward and deform;

[0031] The positioning ring moves upward to tighten the protective sleeve, and the protective sleeve pushes the limiting piece to reset inward.

[0032] In an optional embodiment, a placement groove is axially opened on the outer wall of the detection column, a tension spring is arranged in the placement groove, the upper end of the tension spring is arranged on the positioning ring, and the tension spring is suitable for driving the positioning ring to move downward.

[0033] In an optional embodiment, the axial thickness of the limiting plate is not greater than the distance between the bottom wall of the head and the bottom wall of the positioning groove.

[0034] In an optional embodiment, the elastic member is a compression spring, two ends of which are respectively in contact with the inner side of the limiting piece and the side wall of the groove.

[0035] In an optional embodiment, a driving rod is sleeved on the outer wall of the detection column, and the driving rod is arranged at the movable end of the horizontal moving pair, and the driving rod is suitable for driving the detection column to move horizontally.

[0036] In a third aspect, an embodiment of the present disclosure further provides a working method of a flange detection device, the working method comprising:

[0037] The detection column moves downward until the positioning ring abuts against the surface of the flange, and the flange rotates relative to the detection column. The positioning ring is suitable for detecting whether there is a bulge on the surface of the flange;

[0038] The positioning ring moves downward and abuts against the surface of the head, so that the head is tilted relative to the horizontal plane;

[0039] The elastic member pushes the limiting plate to slide outward and abut against the bottom surface of the head to limit the sealing ring;

[0040] The detection column moves toward the axial center of the flange to insert the head and the sealing ring into the injection port synchronously.

[0041] The beneficial effect of the present invention is that the present invention provides a sealing structure, a flange detection device and a working method thereof, which avoids axial flipping of the sealing ring by tilting the head relative to the horizontal plane during the insertion process of the injection port, ensures uniform pressure on the sealing surface, and thus significantly reduces the assembly difficulty and leakage rate.

[0042] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically cited herein and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in related technologies, the following briefly introduces the drawings required for use in the specific embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0045] Figure 1 A three-dimensional diagram of a sealing structure provided in an embodiment of the present disclosure;

[0046] Figure 2 A sectional perspective view of a sealing structure provided in an embodiment of the present disclosure;

[0047] Figure 3 A three-dimensional diagram of a flange detection device provided in an embodiment of the present disclosure;

[0048] Figure 4 A perspective view of a detection assembly provided in an embodiment of the present disclosure;

[0049] Figure 5 A three-dimensional diagram of a detection column and a limiting piece provided in an embodiment of the present disclosure;

[0050] Figure 6 A sectional perspective view of a detection column and a limiting piece provided in an embodiment of the present disclosure;

[0051] Figure 7 Schematic diagram of the abutment state between the positioning ring and the head provided in an embodiment of the present disclosure.

[0052] In the picture:

[0053] 1. Flange; 10. Positioning groove; 11. Inlet; 2. End cap; 3. Sealing ring; 4. Workbench; 5. Detection assembly; 50. Detection column; 501. Placement groove; 502. Drive rod; 51. Positioning ring; 510. Inclined surface; 52. Protective cover; 53. Limiting piece; 54. Elastic member; 55. Groove;

[0054] 6. Positioning assembly; 60. Driving roller. DETAILED DESCRIPTION

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0056] In this document, when it is mentioned that a first component is located on a second component, this may mean that the first component may be directly formed on the second component, or that a third component may be interposed between the first component and the second component. In addition, in the drawings, the thickness of components may be exaggerated or reduced in order to effectively describe technical content.

[0057] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." when following a list of elements modify the entire list of elements. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0058] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limiting. As used herein, the singular articles "a", "an" and "the" may also be intended to include plural forms, unless otherwise clearly indicated herein. The terms "comprise", "include" and "have" are inclusive and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the particular order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0059] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Thus, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects, or designs. Instead, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0060] Research has revealed that in related technologies, the flange is a key sealing component in high-voltage gas-insulated switchgear (GIS). Its sidewall features radial injection ports for resin injection. After the flange and insulation basin are integrally installed in the GIS, resin is injected through the injection ports into the inner ring of the flange, filling the gaps in the equipment and creating a permanent seal. After the resin cures, the injection ports are plugged with a sealing head to ensure the long-term sealing of the GIS cavity at rated pressure.

[0061] In the related art, the current head sealing mode has the following defects:

[0062] When the traditional head outer wall is sleeved with the sealing ring, the sealing ring is easy to be separated from the head outer wall under extrusion. Further, in order to facilitate insertion, the outer diameter of the head is designed to be slightly smaller than the inner diameter of the waist-shaped hole (the gap is about 0.1-0.3mm), which causes the sealing ring to rotate axially when it is pressed and deformed during the insertion process, resulting in uneven sealing surface pressure.

[0063] The above problems cause assembly difficulties, and the turning of the sealing ring increases the leakage rate, affecting the long-term sealing reliability of the GIS device.

[0064] Therefore, it is urgent to solve the assembly difficulty of the sealing ring when it is inserted into the inner wall of the injection port and to ensure uniform sealing surface pressure, which is a technical problem that needs to be solved in the field.

[0065] The defects of the above-mentioned solutions and their causes are the results of the inventors' practice and careful research, therefore, the discovery process of the above-mentioned problems and the solutions proposed by the present disclosure to solve the above-mentioned problems should be the contribution of the inventors to the present disclosure in the process of the present disclosure.

[0066] It should be noted that similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0067] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0068] As shown in Figure 1 and Figure 2 At least one embodiment provides a sealing structure, comprising:

[0069] A flange plate 1 has a positioning groove 10 axially formed on the outer wall, and the side wall of the positioning groove 10 is radially provided with an injection port 11; a head 2 is adapted to the injection port 11; the head 2 is a cylindrical structure, and the outer diameter of the head 2 is slightly smaller than the inner diameter of the injection port 11, and preferably, the gap is designed to be 0.1-0.3mm. A sealing ring 3 is sleeved on the outer wall of the head 2, and the cross section of the sealing ring 3 is trapezoidal; the inclined surface of the trapezoidal sealing ring 3 faces the insertion direction of the head 2. Wherein, during the insertion of the head 2 into the injection port 11, the head 2 is inclined relative to the horizontal plane to avoid the axial turning of the sealing ring 3 located on the upper surface of the head 2 during the insertion process.

[0070] The specific assembly principle is as follows:

[0071] When the head 2 is initially placed in the positioning groove 10, the axis of the head 2 is parallel to the horizontal plane, as shown in Figure 2In the process of inserting the head 2 into the injection port 11, the head 2 is driven by an external force to tilt downward relative to the horizontal plane, so that the upper surface of the sealing ring 3 located on the upper surface of the head 2 preferentially contacts the inner wall of the injection port 11, thereby avoiding axial flipping of the sealing ring 3. When the sealing ring 3 located above the head 2 is inserted into the injection port 11, the head 2 is driven by an external force to tilt upward relative to the horizontal plane, so that the lower bottom surface of the sealing ring 3 located on the lower surface of the head 2 preferentially contacts the inner wall of the injection port 11. Through the inclined insertion of the head 2, the trapezoidal inclined surface of the sealing ring 3 forms a progressive sealing contact with the inner wall of the injection port 11, and the pressure is evenly distributed.

[0072] like Figures 1 to 7 As shown, at least one embodiment provides a flange detection device, which is used to detect the flange 1 and assist the head 2 in inserting into the injection port 11, including:

[0073] The workbench 4 has a positioning assembly 6 slidingly arranged on it, and the positioning assembly 6 is suitable for driving the flange 1 to rotate circumferentially; the positioning assembly 6 includes two relatively arranged manipulators, which move toward each other to clamp the flange 1. Preferably, a plurality of driven rollers and at least two driving rollers 60 are evenly distributed inside the manipulator, and the driving rollers 60 are suitable for driving the flange 1 to rotate inside the manipulator.

[0074] Reference Attachment Figure 3 and Figure 4 , a detection component 5, which is slidably arranged above the positioning component 6;

[0075] The detection assembly 5 includes a detection column 50; a drive rod 502 is sleeved on the outer wall of the detection column 50, and the drive rod 502 is arranged at the movable end of the horizontal movement pair. The drive rod 502 is suitable for driving the detection column 50 to move horizontally. When the positioning ring 51 moves to abut against the surface of the head 2 and squeezes the head 2 to tilt, the limit plate 53 is inserted into the gap between the bottom wall of the head 2 and the bottom wall of the positioning groove 10. At this time, the horizontal movement pair drives the drive rod 502 to move horizontally, and the detection column 50 is suitable for pushing the head 2 and the sealing ring 3 into the injection port 11.

[0076] Reference Attachment Figure 4 and Figure 6 The positioning ring 51 is mounted on the outer wall of the detection column 50 and is adapted to abut against the surface of the flange 1. The lower surface of the positioning ring 51 is provided with an inclined surface 510. After the positioning ring 51 abuts against the surface of the sealing head 2, the driving rod 502 moves horizontally, and the detection column 50 pushes the sealing head 2 into the injection port 11. As the flange 1 continues to rotate, the inclined surface 510 is adapted to guide the positioning ring 51 out of the positioning groove 10.

[0077] Reference Attachment Figure 6, a protective sleeve 52 is sleeved on the outer wall of the bottom of the detection column 50; the protective sleeve 52 is elastic; wherein the detection column 50 moves downward to the upper surface of the flange plate 1 abutting with the positioning ring 51, at this time the positioning ring 51 moves upward relative to the detection column 50 to the protective sleeve 52 being taut. When the positioning ring 51 moves downward, the protective sleeve 52 changes from the taut state to the relaxed state, and the limiting piece 53 pushes the protective sleeve 52 to outwardly protrude and deform; so that the limiting piece 53 can be inserted into the gap between the bottom wall of the sealing head 2 and the bottom wall of the positioning groove 10. The positioning ring 51 moves upward to tighten the protective sleeve 52, and the protective sleeve 52 pushes the limiting piece 53 to move inwardly.

[0078] Reference is made to the accompanying drawings Figure 5 , a limiting piece 53 is slidably arranged in the groove 55 circumferentially formed on the bottom of the detection column 50; an elastic member 54 is arranged inside the limiting piece 53 and used to drive the limiting piece 53 to move outwardly; the axial thickness of the limiting piece 53 is not greater than the distance between the bottom wall of the sealing head 2 and the bottom wall of the positioning groove 10. The elastic member 54 is a compression spring, and the two ends of the compression spring are respectively in abutment with the inside of the limiting piece 53 and the sidewall of the groove 55. Wherein the detection column 50 moves downward to the surface of the flange plate 1 abutting with the positioning ring 51, the flange plate 1 rotates relative to the detection column 50, and the positioning ring 51 is suitable for detecting whether the surface of the flange plate 1 is protruding; the positioning ring 51 moves downward to abut with the surface of the sealing head 2, so that the sealing head 2 is inclined relative to the horizontal plane; after the positioning ring 51 moves downward, the protective sleeve 52 changes from the taut state to the relaxed state, and the elastic member 54 pushes the limiting piece 53 to slide outwardly and abut with the lower bottom surface of the sealing head 2, so as to limit the sealing ring 3.

[0079] Reference is made to the accompanying drawings Figure 5 In order to realize the lifting movement of the positioning ring 51, an accommodation groove 501 is formed on the outer wall of the detection column 50 in the axial direction, a tension spring is arranged in the accommodation groove 501, the upper end of the tension spring is arranged on the positioning ring 51, and the tension spring is suitable for driving the positioning ring 51 to move downward.

[0080] The working principle is as follows:

[0081] The detection column 50 moves downward, and the positioning ring 51 contacts the surface of the flange plate 1. The detection column 50 continues to move downward, and the positioning ring 51 stretches the protective sleeve 52 to be in the taut state. The protective sleeve 52 in the taut state is suitable for extruding the limiting piece 53 to shrink into the groove 55.

[0082] The flange plate 1 rotates circumferentially through the positioning assembly 6 at a rotating speed of 5-10 r / min, and the positioning ring 51 monitors the surface flatness in real time. In the rotating process of the flange plate 1, if the positioning ring 51 appears upward displacement, the surface of the flange plate 1 is uneven and there is protrusion.

[0083] When the flange plate 1 rotates to the position that the positioning groove 10 is opposite to the detection column 50, as shown in Figure 7As shown, the positioning ring 51 is pulled down by the tension spring, and the lower surface inclined surface 510 of the positioning ring 51 abuts against the upper surface of the head 2, pushing the head 2 to tilt, as shown in FIG. 4. Figure 7 The middle angle a represents the tilt angle of the head 2 relative to the horizontal plane.

[0084] When the positioning ring 51 moves down, the protection sleeve 52 is triggered to relax, and the elastic member 54 pushes the limiting sheet 53 to slide outward to below the head 2.

[0085] The drive rod 502 pushes the detection column 50 to move horizontally to the center of the flange plate 1, and the head 2 and the sealing ring 3 in the tilted state are inserted into the injection port 11.

[0086] At least one embodiment provides a working method of a flange plate detection device, which comprises the following steps:

[0087] The detection column 50 moves downward to abut against the surface of the flange plate 1, and the flange plate 1 rotates relative to the detection column 50, and the positioning ring 51 is adapted to detect whether the surface of the flange plate 1 has a protrusion;

[0088] The positioning ring 51 moves downward to abut against the surface of the head 2, so that the head 2 tilts relative to the horizontal plane;

[0089] The elastic member 54 pushes the limiting sheet 53 to slide outward to abut against the lower bottom surface of the head 2, so as to limit the sealing ring 3;

[0090] The detection column 50 moves to the center of the flange plate 1, so as to insert the head 2 and the sealing ring 3 into the injection port 11.

[0091] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0092] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used herein unless expressly indicated above. Therefore, without departing from the teachings of the example embodiments, the first element, component, region, layer or section discussed above may be referred to as a second element, component, region, layer or section.

[0093] With the above-described preferred embodiments of the present invention as inspiration, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A flange detection device for detecting a flange, wherein the flange is provided with an injection port, and the injection port of the flange is sealed with a sealing structure, characterized in that: The sealing structure comprises: The flange (1) has an outer wall axially provided with a positioning groove (10), and a side wall of the positioning groove (10) has an injection port (11) radially provided; A sealing head (2) adapted to fit the injection port (11); A sealing ring (3) is sleeved on the outer wall of the sealing head (2) and has a trapezoidal cross section, with the trapezoidal inclined surface of the sealing ring (3) facing the insertion direction of the sealing head (2); In the process of inserting the sealing head (2) into the injection port (11), the sealing head (2) is tilted relative to the horizontal plane; The detection device is also used to assist the sealing head (2) in the sealing structure in being inserted into the injection port (11), and the detection device further comprises: A workbench (4) is provided with a positioning assembly (6) slidably disposed thereon, wherein the positioning assembly (6) is suitable for driving the flange (1) to rotate circumferentially; A detection component (5) is slidably arranged above the positioning component (6); The detection component (5) comprises: Detection column (50); A positioning ring (51) is provided on the outer wall of the detection column (50) and is adapted to abut against the surface of the flange (1); A protective sleeve (52) is sleeved on the bottom outer wall of the detection column (50); A limiting piece (53) is slidably arranged in a groove (55) circumferentially provided at the bottom of the detection column (50); an elastic member (54), which is located inside the limiting plate (53) and is used to drive the limiting plate (53) to move outward; The detection column (50) moves downward until the positioning ring (51) abuts against the surface of the flange (1), and the flange (1) rotates relative to the detection column (50). The positioning ring (51) is suitable for detecting whether there is a protrusion on the surface of the flange (1); The positioning ring (51) moves downward to abut against the surface of the head (2), so that the head (2) is tilted relative to the horizontal plane; After the positioning ring (51) moves downward, the protective sleeve (52) changes from a tightened state to a relaxed state, and the elastic member (54) pushes the limiting piece (53) to slide outward and abut against the bottom surface of the head (2) to limit the sealing ring (3).

2. The flange detection device according to claim 1, characterized in that: The lower surface of the positioning ring (51) is provided with an inclined surface (510); After the positioning ring (51) contacts the surface of the head (2), the flange (1) continues to rotate, and the inclined surface (510) is suitable for guiding the positioning ring (51) to disengage from the positioning groove (10).

3. The flange detection device according to claim 1, characterized in that: The protective cover (52) is elastic; When the positioning ring (51) moves downward, the limiting piece (53) pushes the protective cover (52) to bulge outward and deform; The positioning ring (51) moves upward to tighten the protective sleeve (52), and the protective sleeve (52) pushes the limiting piece (53) to reset inward.

4. The flange detection device according to claim 1, characterized in that: A placement groove (501) is axially provided on the outer wall of the detection column (50), a tension spring is provided in the placement groove (501), the upper end of the tension spring is provided on the positioning ring (51), and the tension spring is suitable for driving the positioning ring (51) to move downward.

5. The flange detection device according to claim 1, characterized in that: The axial thickness of the limiting piece (53) is no greater than the distance between the bottom wall of the head (2) and the bottom wall of the positioning groove (10).

6. The flange detection device according to claim 1, characterized in that: The elastic member (54) is a compression spring, and its two ends respectively abut against the inner side of the limiting piece (53) and the side wall of the groove (55).

7. The flange detection device according to claim 1, characterized in that: A driving rod (502) is sleeved on the outer wall of the detection column (50), and the driving rod (502) is arranged at the movable end of the horizontal moving pair. The driving rod (502) is suitable for driving the detection column (50) to move horizontally.

8. A method for operating a flange detection device, using the flange detection device according to any one of claims 1 to 7, characterized in that: The working method comprises: The detection column (50) moves downward until the positioning ring (51) abuts against the surface of the flange (1), and the flange (1) rotates relative to the detection column (50). The positioning ring (51) is suitable for detecting whether there is a protrusion on the surface of the flange (1); The positioning ring (51) moves downward to abut against the surface of the head (2), so that the head (2) is tilted relative to the horizontal plane; The elastic member pushes the limiting plate (53) to slide outward and abut against the lower bottom surface of the head (2) to limit the sealing ring (3); The detection column (50) moves toward the axial direction of the flange (1) to simultaneously insert the head (2) and the sealing ring (3) into the injection port (11).

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