A self-tightening flange and a pre-installation air tightness detection device and method thereof

Abstract

The application discloses a self-tightening flange and a pre-installation air tightness detection equipment and detection method thereof, relates to the technical field of flanges, and comprises a convex flange and a concave flange. The concave flange is sequentially formed with a first top surface, a second top surface, a third top surface and a fourth top surface with increasing height along a central axis thereof. The convex flange is sequentially formed with a first bottom surface, a second bottom surface, a third bottom surface and a fourth bottom surface with decreasing height along a central axis thereof. The height of the first bottom surface is lower than that of the fourth bottom surface. The second top surface and the third top surface are formed with a sealing cavity between the second bottom surface and the third bottom surface. A second sealing ring is embedded on a side of the sealing cavity away from the central axis. An annular self-tightening cavity is formed between the second sealing ring and the sealing cavity. An annular spring is arranged on a side of the sealing cavity close to the central axis. The arc top side of the annular spring is in abutment with the second sealing ring. The application has the characteristics of improving the sealing performance of flange connection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flanges, in particular to a self-tightening flange and a pre-installation air tightness detection device and method thereof. BACKGROUND

[0002] Flanges are pipe connectors, which are essential for the connection of equipment and pipes in industrial production devices, transportation engineering, aerospace, national defense, military, etc., and also are general pipe fittings with a large demand.

[0003] Traditional flanges can be simplified as flat welding flanges for stress analysis, which adopt a forced sealing structure. Under the action of bolt pre-tightening force, the hardness of the sealing gasket and gasket is usually lower than that of the flange, and the flange sealing surface is deformed by extrusion, and the uneven micro gaps on the flange sealing surface are filled, and a sealing pressure is formed on the sealing surface to achieve the sealing effect. The defects of traditional flanges are: conventional flanges often adopt a single sealing ring structure, which is prone to leakage due to stress relaxation in high-pressure, high-temperature or vibration environment. The sealing ring is subjected to single direction force (only axial compression), lacks self-tightening compensation mechanism, and the sealing reliability decreases when the medium pressure fluctuates.

[0004] Traditional flange air tightness detection usually needs to use a general sealing tool for air tightness detection, and is assembled and disassembled manually. The general sealing tool is not tightly attached to the flange end face (especially for special-shaped flanges), and the gas leaks after being filled, resulting in false leakage false alarm.

[0005] Therefore, it is necessary to design a self-tightening flange with improved sealing effect and a pre-installation air tightness detection device and method. SUMMARY

[0006] The present application aims to provide a self-tightening flange and a pre-installation air tightness detection device and method thereof to solve the problems in the background art.

[0007] In order to solve the above technical problems, the present application provides the following technical scheme: a self-tightening flange, comprising a convex flange and a concave flange, the concave flange outwardly forms a first top surface, a second top surface, a third top surface and a fourth top surface with increasing height along a central axis, the convex flange outwardly forms a first bottom surface, a second bottom surface, a third bottom surface and a fourth bottom surface with decreasing height along a central axis, and the height of the first bottom surface is lower than that of the fourth bottom surface.

[0008] The second top surface, the third top surface and the second bottom surface, the third bottom surface form a sealed cavity, the second sealing ring is embedded on one side away from the central axis in the sealed cavity, an annular self-tightening cavity is formed between the second sealing ring and the sealed cavity, an annular elastic sheet is arranged on one side of the sealed cavity close to the central axis, the arc top side of the annular elastic sheet abuts against the second sealing ring, a plurality of annular protrusions are arranged on the two side surfaces of the second sealing cavity corresponding to the annular self-tightening cavity, the annular protrusions on the second sealing ring are in abutting contact with the inner wall of the sealed cavity, the second sealing ring and one side of the sealed cavity away from the central axis divide the sealed cavity to form a buffer cavity, the third top surface and the third bottom surface are both provided with annular grooves two corresponding to the buffer cavity, and the upper and lower ends of the part of the second sealing ring entering the buffer cavity are extruded into the annular grooves two on the upper and lower sides, respectively.

[0009] According to the above technical scheme, the first top surface is perpendicular to the inner cavity wall of the convex flange, the first bottom surface is perpendicular to the inner cavity wall of the concave flange, the first top surface and the second top surface form a first vertical surface, the second top surface and the third top surface form a first inclined surface, the third top surface and the fourth top surface form a second vertical surface, the first bottom surface and the second bottom surface form a first vertical surface, the second bottom surface and the third bottom surface form a second inclined surface, and the third bottom surface and the fourth bottom surface form a second vertical surface.

[0010] According to the above technical scheme, the height dimension of the first vertical surface is 6 times the height dimension of the first vertical surface, the first inclined surface and the second inclined surface are symmetrically arranged based on the fourth top surface, and the inclination angle of the side of the first inclined surface and the second inclined surface close to the fourth top surface is α.

[0011] According to the above technical scheme, the first top surface and the first bottom surface form an annular groove one, and the first sealing ring is installed in the annular groove one.

[0012] According to the above technical scheme, the two arc end sides of the annular elastic sheet are integrally fixedly connected with support rings with an "L" shaped cross section, the two side surfaces of one of the support rings on the upper side are respectively matched with the second bottom surface and the upper end of the first vertical surface, and the two side surfaces of one of the support rings on the lower side are respectively matched with the second top surface and the lower end of the first vertical surface.

[0013] According to the technical scheme, the self-tightening flange detection device is provided, which comprises a base, two opposite sliding plates arranged on the upper side of the base, one of the sliding plates is provided with a rotatable mounting seat one, the other sliding plate is provided with a rotatable mounting seat two, the lower ends of the mounting seat one and the mounting seat two are hingedly connected with the corresponding sliding plates, the mounting seat one is provided with a mounting groove one matched with the outer ring step surface of the convex flange, the groove bottom of the mounting groove one is open, the mounting seat two is provided with a mounting groove two matched with the outer ring step surface of the concave flange, the groove bottom of the mounting groove two is open, the upper side of the base is provided with two seal plates which can be lifted and relatively moved, rubber pads are embedded on the opposite sides of the two seal plates, a plurality of air holes which can be filled with air are arranged at the centers of the two seal plates, and an air pressure sensor is embedded on the seal plate.

[0014] According to the technical scheme, the mounting groove one and the mounting groove two are provided with a plurality of positioning blocks which can move in the radial direction, the inner walls of the mounting groove one and the mounting groove two are provided with positioning grooves corresponding to the positioning blocks, the positioning blocks are matched with the positioning grooves, and the positioning blocks slide in the positioning grooves.

[0015] According to the technical scheme, the base is provided with a sliding groove corresponding to the two sliding plates, the sliding plates slide in the sliding groove, the sides of the two sliding plates away from each other are provided with a hydraulic telescopic cylinder two, the fixed end of the hydraulic telescopic cylinder two is fixedly connected to the base, the output end of the hydraulic telescopic cylinder two is fixedly connected to the sliding plate, the upper sides of the two ends of the mounting seat one and the mounting seat two along the width direction of the sliding plate are hingedly connected with a hydraulic telescopic cylinder three, the fixed end of the hydraulic telescopic cylinder three is hingedly connected with the sliding plate, the upper side of the connecting plate is fixedly connected to the base, the upper side of the connecting plate towards the base is provided with a hydraulic telescopic cylinder four, the fixed end of the hydraulic telescopic cylinder four is fixedly connected to the connecting plate, the output end of the hydraulic telescopic cylinder four is fixedly connected with a support plate, the sides of the two seal plates away from each other are provided with a hydraulic telescopic cylinder five at the four corners, the fixed end of the hydraulic telescopic cylinder five is fixedly connected to the support plate, the output end of the hydraulic telescopic cylinder five is fixedly connected with the seal plate, the sides of the two seal plates away from each other are provided with an air cover corresponding to the air holes, the air cover is communicated with an air compressor through a pipeline, and a control valve is arranged on the pipeline connected with the air cover.

[0016] According to the technical scheme, a detection method of the self-tightening flange pre-installation air tightness detection device is provided.

[0017] S1: the convex flange and the concave flange are respectively installed in the mounting groove one and the mounting groove two, and the convex flange and the concave flange are clamped and fixed and then combined and installed.

[0018] S2: the two end faces of the combined flange are sealed by the sealing plate;

[0019] S3: gas is pumped into the inner cavity of the flange, the gas pressure in the inner cavity of the flange is detected by the gas pressure sensor, the change of the gas pressure is detected after the gas pressure reaches the detection standard, the alarm value of the preset gas pressure change amount is A, the actual change amount of the gas pressure is A1, when A1 < A, it indicates that the sealing property of the flange formed by combining the convex flange and the concave flange meets the requirements, and the detection is qualified, when A1 >= A, it indicates that the sealing property of the flange formed by combining the convex flange and the concave flange is unqualified, and the size precision detection and the accessory quality detection are further performed on the flange with unqualified gas tightness.

[0020] Compared with the prior art, the beneficial effects achieved by the present application are: the first sealing ring fills the annular groove to achieve basic sealing; the second sealing ring forms a self-tightening seal in the sealing cavity, and the annular elastic piece pushes the annular protrusion on the second sealing ring to make it press against the inner wall of the sealing cavity, forming multiple contact surfaces, and the higher the pressure, the tighter the sealing.

[0021] By setting the annular elastic piece, the annular elastic piece converts the locking force of the bolt into radial pressing force through the support ring, forcing one end of the second sealing ring to extrude into the buffer cavity to increase the blocking effect and block the medium penetration path.

[0022] By setting the mounting groove one and the mounting groove two respectively matched with the convex flange and the concave flange, and clamping and fixing through the positioning block.

[0023] By controlling the displacement change of the mounting seat one and the mounting seat two, the turning and molding of the convex flange are realized, the sealing and pressure charging of the combined flange are realized by setting the sealing plate and the air hole, and finally the detection structure is determined by the gas pressure sensor to complete the high-quality gas tightness detection of the self-tightening flange. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0025] Figure 1 is a front cross-sectional structure schematic view of the self-tightening flange of the present application;

[0026] Figure 2 is a front half cross-sectional structure schematic view of the self-tightening flange of the present application;

[0027] Figure 3 is a front half cross-sectional structure schematic view of the self-tightening flange of the present application; Figure 1 is a local enlarged structure schematic view of the S area of the present application;

[0028] Figure 4It is the overall structure schematic diagram of the self-tightening flange air tightness detection equipment of the present application;

[0029] Figure 5 It is the partial sectional structure schematic diagram of the mounting seat one and mounting seat two of the detection equipment of the present application;

[0030] Figure 6 It is the support plate related structure schematic diagram of the detection equipment of the present application;

[0031] In the figure: 1, convex flange; 2, concave flange; 3, first top surface; 4, second top surface; 5, third top surface; 6, fourth top surface; 7, first bottom surface; 8, second bottom surface; 9, third bottom surface; 10, fourth bottom surface; 11, through hole one; 12, through hole two; 13, annular groove one; 14, sealing cavity; 15, first vertical surface; 16, first inclined surface; 17, second vertical surface; 18, first vertical surface; 19, second inclined surface; 20, second vertical surface; 21, first sealing ring; 22, second sealing ring; 23, annular self-tightening cavity; 24, buffer cavity; 25, annular groove two; 26, annular protrusion; 27, annular elastic sheet; 28, arc-shaped groove; 29, support ring; 30, base; 31, sliding plate; 32, mounting seat one; 33, mounting seat two; 34, positioning block; 35, positioning groove; 36, hydraulic telescopic cylinder one; 37, sliding groove; 38, hydraulic telescopic cylinder two; 39, hydraulic telescopic cylinder three; 40, connecting plate; 41, hydraulic telescopic cylinder four; 42, support plate; 43, sealing plate; 44, hydraulic telescopic cylinder five; 45, air vent hole; 46, air cover; 47, mounting groove one; 48, mounting groove two. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0033] Embodiment one, please refer to Figures 1-3 The present application provides the technical solution: a self-tightening flange, comprising convex flange 1 and concave flange 2, wherein the concave flange 2 has first top surface 3, second top surface 4, third top surface 5 and fourth top surface 6 formed outward along the central axis in turn, and the heights of the first top surface 3, second top surface 4, third top surface 5 and fourth top surface 6 increase in turn.

[0034] The convex flange 1 has first bottom surface 7, second bottom surface 8, third bottom surface 9 and fourth bottom surface 10 formed outward along the central axis in turn, wherein the heights of the second bottom surface 8, third bottom surface 9 and fourth bottom surface 10 decrease in turn, and the height of the first bottom surface 7 is lower than that of the fourth bottom surface 10.

[0035] A plurality of through holes one 11 are arranged on the convex flange 1 corresponding to the part of the fourth top surface 6, and are uniformly distributed in a circle with the central axis of the convex flange 1 as the center.

[0036] At the same time, the concave flange 2 is provided with through holes two 12 corresponding to the plurality of through holes one 11, the inner diameters of the through holes one 11 and the through holes two 12 are the same, and the convex flange 1 and the concave flange 2 are locked and fixed by penetrating the through holes one 11 and the through holes two 12 with bolts and cooperating with nuts after being matched.

[0037] When the convex flange 1 and the concave flange 2 are matched and installed, the first top surface 3, the second top surface 4, the third top surface 5 and the fourth top surface 6 correspond to the first bottom surface 7, the second bottom surface 8, the third bottom surface 9 and the fourth bottom surface 10 respectively, the ring diameters of the first top surface 3, the second top surface 4, the third top surface 5 and the fourth top surface 6 corresponding to the first bottom surface 7, the second bottom surface 8, the third bottom surface 9 and the fourth bottom surface 10 respectively are the same, and the fourth top surface 6 directly contacts the fourth bottom surface 10, the first top surface 3 and the first bottom surface 7 form an annular groove one 13, and the second top surface 4 and the third top surface 5 form a sealing cavity 14 with the second bottom surface 8 and the third bottom surface 9.

[0038] As shown in the drawings, Figure 2 The first top surface 3 is perpendicular to the inner cavity wall of the convex flange 1, the first bottom surface 7 is perpendicular to the inner cavity wall of the concave flange 2, the first top surface 3 and the second top surface 4 are arranged parallel to each other, and the first top surface 3 and the second top surface 4 form a first vertical surface 15, and the first vertical surface 15 is perpendicular to the first top surface 3 and the second top surface 4.

[0039] The second top surface 4 and the third top surface 5 form a first inclined surface 16, the third top surface 5 and the fourth top surface 6 are arranged parallel to each other, the third top surface 5 and the fourth top surface 6 form a second vertical surface 17, and the second vertical surface 17 is perpendicular to the third top surface 5 and the fourth top surface 6.

[0040] The first bottom surface 7 and the second bottom surface 8 are arranged parallel to each other, the first bottom surface 7 and the second bottom surface 8 form a first vertical surface 18, the first vertical surface 18 is perpendicular to the first bottom surface 7 and the second bottom surface 8, and the height dimension of the first vertical surface 18 is 6 times the height dimension of the first vertical surface 15.

[0041] The second bottom surface 8 and the third bottom surface 9 form a second inclined surface 19, the third bottom surface 9 and the fourth bottom surface 10 are arranged parallel to each other, the third bottom surface 9 and the fourth bottom surface 10 form a second vertical surface 20, and the second vertical surface 20 is perpendicular to the third bottom surface 9 and the fourth bottom surface 10.

[0042] The first inclined surface 16 and the second inclined surface 19 are symmetrically arranged based on the fourth top surface 6, and the first inclined surface 16 and the second inclined surface 19 are inclined outward by an angle of a on the side close to the fourth top surface 6, the angle a is 5-10°, and in the embodiment, the angle a is preferably 10°.

[0043] Therefore, the cross-sectional shape of the sealing cavity 14 is a "convex" shape, and the sealing cavity 14 is closed and formed by the first vertical surface 18, the second top surface 4, the second bottom surface 8, the first inclined surface 16, the second inclined surface 19, the third top surface 5, the third bottom surface 9, the second vertical surface 17, and the second vertical surface 20.

[0044] The first sealing ring 21 is arranged in the annular groove 13, and the second sealing ring 22 is arranged in the sealing cavity 14, and the second sealing ring 22 is arranged on the side of the sealing cavity 14 away from the center axis of the flange.

[0045] The second sealing ring 22 cooperates with the sealing cavity 14, and the second sealing ring 22 and the first inclined surface 16 and the second inclined surface 19 respectively form annular self-tight cavities 23 with a triangular cross-sectional shape, and the annular self-tight cavities 23 are closed and formed by the B surface and the C surface of the second sealing ring 22 and the D surface of the sealing cavity 14.

[0046] The second sealing ring 22 and the sealing cavity 14 away from the center axis of the flange divide the sealing cavity 14 to form a buffer cavity 24, and the third top surface 5 and the third bottom surface 9 correspond to the buffer cavity 24 and are provided with annular grooves 25, and the annular grooves 25 are in communication with the buffer cavity 24.

[0047] In the initial state, the end of the second sealing ring 22 away from the center axis is flush with the side wall of the annular groove 25 close to the center axis.

[0048] The second sealing cavity 14 corresponds to the B surface and the C surface of the annular self-tight cavity 23 and forms an F angle, and the F angle is an obtuse angle.

[0049] The B surface and the C surface of the second sealing cavity 14 are provided with a plurality of annular protrusions 26, and the cross-sectional shape of the annular protrusions 26 is semicircular.

[0050] The plurality of annular protrusions 26 on the B surface and the C surface of the second sealing cavity 14 decrease in radius from the side close to the F angle to the side away from the F angle.

[0051] The sealing cavity 14 close to the center axis is provided with an annular spring 27, and the cross-sectional shape of the annular spring 27 is a circular arc, and the central angle of the circular arc is 90°.

[0052] The center of the annular spring 27 is towards the center axis, and the arc top side of the annular spring 27 abuts against the second sealing ring 22.

[0053] The side of the second sealing ring 22 abutting against the annular spring 27 is provided with an arc-shaped groove 28 matched with the annular spring 27.

[0054] The two arc end sides of the annular elastic sheet 27 are integrally fixedly connected with support rings 29 in the shape of "L" in cross section, wherein the two side faces of the upper support ring 29 are respectively in abutment with the second bottom face 8 and the upper end of the first vertical face 18, and the two side faces of the lower support ring 29 are respectively in abutment with the second top face 4 and the lower end of the first vertical face 18.

[0055] The second sealing ring 22 is in interference fit with the sealing cavity 14, and the first sealing ring 21 is in interference fit with the annular groove 13.

[0056] In the present embodiment, before installation, the first sealing ring 21 is adhered to the first top face 3 of the female flange 2, the second sealing ring 22 is sleeved on the annular elastic sheet 27, and then the annular elastic sheet 27 is sleeved on the first vertical face 18 of the male flange 1 through the two support rings, so that the upper support ring of the annular elastic sheet 27 is in abutment at the intersection of the first vertical face 18 and the second bottom face 8.

[0057] Subsequently, the male flange 1 and the female flange 2 are combined, at this time, the lower support ring of the annular elastic sheet 27 is in abutment on the second top face 4, and the male flange 1 and the female flange 2 are installed and fixed by using bolts.

[0058] During the locking and fixing of the male flange 1 and the female flange 2 by the bolts, under the action of the locking force, the first bottom face 7 of the male flange 1 presses the first sealing ring 21 tightly, so that the first sealing ring 21 seals the annular groove 13.

[0059] At the same time, under the action of the locking force, the arc top side of the annular elastic sheet 27 presses the second sealing ring 22, so that the annular protrusions 26 of the B face and the C face of the second sealing ring 22 are in abutment and contact with the D face of the sealing cavity 14, thereby forming a plurality of contact faces E, so as to realize the multiple sealing effect of the second sealing ring 22 in the annular self-tightening cavity 23.

[0060] At the same time, the pressing action of the annular elastic sheet 27 makes the end of the second sealing ring 22 away from the center axis enter the buffer cavity 24, and since the second sealing ring 22 is in interference fit with the sealing cavity 14 and is under the action of elasticity, the upper and lower ends of the part of the second sealing ring 22 entering the buffer cavity 24 are respectively extruded into the annular groove two 25 on the upper and lower sides, so as to make the right angle intersection on the side close to the center axis of the annular groove two 25 form a blocking point Z in cooperation with the second sealing ring 22.

[0061] Finally, the second sealing ring 22 realizes the multiple sealing effect in the sealing cavity 14, and cooperates with the sealing property of the first sealing ring 21 to improve the overall sealing effect of the flange.

[0062] Embodiment two, please refer to Figures 4-6On the basis of the first embodiment, a pre-installation air tightness detection device of a self-tightening flange is added, which comprises a base 30, two sliding plates 31 are arranged on the upper side of the base 30 and are opposite to each other, and one of the two sliding plates 31 is provided with a rotatable mounting seat one 32, and the other sliding plate 31 is provided with a rotatable mounting seat two 33, and the lower ends of the mounting seat one 32 and the mounting seat two 33 are hingedly connected with the corresponding sliding plate 31.

[0063] The mounting seat one 32 is used for mounting and placing a convex flange 1, and a mounting groove one 47 is formed in the mounting seat one 32 and matches the outer ring step surface of the convex flange 1, and the groove bottom of the mounting groove one 47 is open.

[0064] The mounting seat two 33 is used for mounting and placing a concave flange 2, and a mounting groove two 48 is formed in the mounting seat two 33 and matches the outer ring step surface of the concave flange 2, and the groove bottom of the mounting groove two 48 is open.

[0065] A plurality of positioning blocks 34 which can move in the radial direction are arranged in the mounting groove one 47 and the mounting groove two 48, and the plurality of positioning blocks 34 are uniformly distributed in a circle with the center axis of the mounting groove one 47 or the mounting groove two 48 as the center.

[0066] Positioning grooves 35 are formed in the inner walls of the mounting groove one 47 and the mounting groove two 48 and match the positioning blocks 34, and the positioning blocks 34 slide in the positioning grooves 35.

[0067] The side of the plurality of positioning blocks 34 away from each other is provided with a hydraulic telescopic cylinder one 36, the fixed end of the hydraulic telescopic cylinder one 36 penetrates and is fixedly connected to the corresponding mounting seat one 32 or mounting seat two 33, the output end of the hydraulic telescopic cylinder one 36 is fixedly connected with the positioning block 34, the positioning block 34 is driven to move by the hydraulic telescopic cylinder one 36, and the convex flange 1 or the concave flange 2 is locked and fixed.

[0068] The base 30 is provided with a sliding groove 37 corresponding to the two sliding plates 31, the sliding plate 31 slides in the sliding groove 37, the side of the two sliding plates 31 away from each other is provided with a hydraulic telescopic cylinder two 38, the fixed end of the hydraulic telescopic cylinder two 38 is fixedly connected to the base 30, the output end of the hydraulic telescopic cylinder two 38 is fixedly connected with the sliding plate 31, and the sliding plate 31 is driven to slide by the hydraulic telescopic cylinder two 38.

[0069] The upper sides of the two ends of the mounting seat one 32 and the mounting seat two 33 along the width direction of the sliding plate 31 are hingedly connected with a hydraulic telescopic cylinder three 39, and the fixed end of the hydraulic telescopic cylinder three 39 is hingedly connected with the sliding plate 31.

[0070] When the output end of the hydraulic telescopic cylinder three 39 is extended, the mounting seat one 32 and the mounting seat two 33 are rotated from the 45° inclined arrangement to the 90° vertical arrangement.

[0071] Simultaneously control the output end of the hydraulic telescopic cylinder two 38 to extend, so that the convex flange 1 on the mounting seat one 32 and the concave flange 2 on the mounting seat two 33 are combined.

[0072] The base 30 is further fixedly connected with a connecting plate 40, the connecting plate 40 is in the shape of "N", and the side of the connecting plate 40 facing the base 30 is provided with a hydraulic telescopic cylinder four 41, the fixed end of the hydraulic telescopic cylinder four 41 is fixedly connected to the connecting plate 40, and the output end of the hydraulic telescopic cylinder four 41 is fixedly connected with a support plate 42, the support plate 42 is in the shape of inverted "U", and two sealing plates 43 moving towards each other are arranged in the support plate 42.

[0073] The four corners of the side of the two sealing plates 43 away from each other are provided with hydraulic telescopic cylinders five 44, the fixed ends of the hydraulic telescopic cylinders five 44 are fixedly connected to the support plate 42, and the output ends of the hydraulic telescopic cylinders five 44 are fixedly connected with the sealing plates 43.

[0074] The two sealing plates 43 are symmetrically arranged with the center of the base 30 as the reference, and the side of the two sealing plates 43 opposite to each other is embedded with rubber pads.

[0075] A plurality of air holes 45 are arranged at the center of the two sealing plates 43, and air hoods 46 are sealingly arranged on the side of the two sealing plates 43 away from each other corresponding to the air holes 45, and the air hoods 46 are communicated with an air compressor through pipelines.

[0076] The sealing plates 43 are embedded with air pressure sensors, and control valves are arranged on the pipelines communicating with the air hoods 46, when the air pressure in the inner cavity of the flanges reaches a constant value after the flanges are combined, the pipelines are closed, the air pressure changes in the inner cavity of the flanges are detected through the air pressure sensors, so as to judge the sealing performance of the combined flanges, and the air pressure sensors are signal-connected with a processor.

[0077] In this embodiment, the convex flange 1 and the concave flange 2 are respectively placed in the mounting groove one 47 and the mounting groove two 48 by the mechanical hand.

[0078] Then, the output end of the hydraulic telescopic cylinder one 36 is controlled to extend, so that the positioning blocks 34 on the mounting seat one 32 and the mounting seat two 33 are respectively locked and fixed to the convex flange 1 and the concave flange 2.

[0079] Subsequently, the output end of the hydraulic telescopic cylinder three 39 is controlled to extend, so that the mounting seat one 32 and the mounting seat two 33 are rotated from the horizontal arrangement to the vertical arrangement.

[0080] Then, the output end of the hydraulic telescopic cylinder two 38 is controlled to extend, so that the mounting seat one 32 and the mounting seat two 33 move synchronously towards the center, and finally the convex flange 1 and the concave flange 2 are combined.

[0081] The output end of the hydraulic telescopic cylinder four 41 is lowered, the support plate 42 falls to cover the installed seat one 32 and the installed seat two 33 after moving, and then the output end of the hydraulic telescopic cylinder five 44 is controlled to extend, so that the two sealing plates 43 are respectively closed and seal the two end faces of the flange.

[0082] After the sealing plates 43 are closed and sealed to the flange after being combined, first, the air compressor pumps gas into the inner cavity of the flange through the pipeline, the air cover 46 and the air hole 45, detects the air pressure in the inner cavity through the air pressure sensor, and after the air pressure reaches the detection standard, closes the pipeline through the control valve on the pipeline, and detects the change of the air pressure in the inner cavity of the flange through the air pressure sensor.

[0083] The processor presets the warning value of the actual change amount of the air pressure, which is denoted as A, and the actual change amount of the air pressure, which is denoted as A1.

[0084] When the actual change amount A1 of the air pressure in the inner cavity of the flange is less than A within a specified time, it indicates that the sealing property of the flange formed by combining the convex flange 1 and the concave flange 2 meets the requirements and the detection is qualified.

[0085] When the actual change amount A1 of the air pressure in the inner cavity of the flange is greater than or equal to A within a specified time, it indicates that the sealing property of the flange formed by combining the convex flange 1 and the concave flange 2 is unqualified.

[0086] After the detection is completed, each component is reset in order, and finally the convex flange 1 and the concave flange 2 are taken out by the mechanical hand for subsequent processing. The flanges with unqualified air tightness are subjected to size precision detection and accessory quality detection by the remaining devices to determine the root cause and reduce manufacturing cost waste.

[0087] The convex flange 1 and the concave flange 2 with qualified air tightness detection are subjected to subsequent finished product packaging processing.

[0088] A detection method of a self-tightening flange pre-installation air tightness detection device:

[0089] S1: The convex flange 1 and the concave flange 2 are respectively installed in the installation groove one 47 and the installation groove two 48, and the convex flange 1 and the concave flange 2 are clamped and fixed for combined installation;

[0090] S2: The two end faces of the flange after being combined are respectively sealed and pressed by the sealing plates 43;

[0091] S3: Gas is pumped into the inner cavity of the flange, the air pressure in the inner cavity of the flange is detected through the air pressure sensor, the change of the air pressure is detected after the air pressure reaches the detection standard, the warning value of the change amount of the air pressure is preset by the processor, which is denoted as A, and the actual change amount of the air pressure is denoted as A1.

[0092] When A1

[0093] When A1≥A, it indicates that the sealing property of the flange formed by combining the convex flange 1 and the concave flange 2 is unqualified, and the size precision detection and the accessory quality detection are performed again on the flange with unqualified air tightness.

[0094] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0095] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will still be able to make modifications to the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A self-tightening flange, characterized by: It includes convex flange (1) and concave flange (2), the concave flange (2) is sequentially formed with the first top surface (3), the second top surface (4), the third top surface (5) and the fourth top surface (6) of increasing height along the central axis thereof, the convex flange (1) is sequentially formed with the first bottom surface (7) and the second bottom surface (8), the third bottom surface (9) and the fourth bottom surface (10) of decreasing height along the central axis thereof, and the height of the first bottom surface (7) is lower than that of the fourth bottom surface (10); The second top surface (4), the third top surface (5) and the second bottom surface (8), the third bottom surface (9) form a sealing cavity (14), a second sealing ring (22) is embedded on the side away from the central axis in the sealing cavity (14), an annular self-tightening cavity (23) is formed between the second sealing ring (22) and the sealing cavity (14), an annular spring (27) is arranged on the side close to the central axis of the sealing cavity (14), the arc top side of the annular spring (27) abuts against the second sealing ring (22), a plurality of annular protrusions (26) are arranged on the two side faces of the second sealing ring (22) corresponding to the annular self-tightening cavity (23), the annular protrusions (26) on the second sealing ring (22) are in abutting contact with the inner wall of the sealing cavity (14), the second sealing ring (22) and the side away from the central axis of the sealing cavity (14) divide the sealing cavity (14) to form a buffer cavity (24), the third top surface (5) and the third bottom surface (9) are both provided with annular grooves two (25) corresponding to the buffer cavity (24), and the upper and lower ends of the part of the second sealing ring (22) entering the buffer cavity (24) are extruded into the annular grooves two (25) on the upper and lower sides.

2. A self-tightening flange according to claim 1, characterized in that: The first top surface (3) is perpendicular to the inner cavity wall of the convex flange (1), the first bottom surface (7) is perpendicular to the inner cavity wall of the concave flange (2), a first vertical surface (15) is formed between the first top surface (3) and the second top surface (4), a first inclined surface (16) is formed between the second top surface (4) and the third top surface (5), a second vertical surface (17) is formed between the third top surface (5) and the fourth top surface (6), a first vertical surface (18) is formed between the first bottom surface (7) and the second bottom surface (8), a second inclined surface (19) is formed between the second bottom surface (8) and the third bottom surface (9), and a second vertical surface (20) is formed between the third bottom surface (9) and the fourth bottom surface (10).

3. A self-tightening flange according to claim 2, wherein: The height dimension of the first vertical surface (18) is 6 times the height dimension of the first vertical surface (15), the first inclined surface (16) and the second inclined surface (19) are symmetrically arranged based on the fourth top surface (6), and the side close to the fourth top surface (6) of the first inclined surface (16) and the second inclined surface (19) is inclined outward by an angle α.

4. A self-tightening flange according to claim 3, wherein: An annular groove one (13) is formed between the first top surface (3) and the first bottom surface (7), and a first sealing ring (21) is installed in the annular groove one (13).

5. A self-tightening flange according to claim 4, wherein: Two arc end sides of the annular elastic sheet (27) are integrally fixed with a support ring (29) with "L" shaped cross section, two side faces of the upper support ring (29) respectively match with the upper end of the second bottom face (8) and the first vertical face (18), two side faces of the lower support ring (29) respectively match with the lower end of the second top face (4) and the first vertical face (18).

6. The pre-assembled self-tightening flange leak tightness testing apparatus according to any one of claims 1-5, wherein: The base (30) is provided with two opposite sliding plates (31) on the upper side, one of the sliding plates (31) is provided with a rotatable mounting seat one (32), the other sliding plate (31) is provided with a rotatable mounting seat two (33), the lower end of the mounting seat one (32) and the mounting seat two (33) are hingedly connected with the corresponding sliding plate (31), the mounting seat one (32) is provided with a mounting groove one (47) matched with the outer ring step surface of the convex flange (1), the groove bottom of the mounting groove one (47) is open, the mounting seat two (33) is provided with a mounting groove two (48) matched with the outer ring step surface of the concave flange (2), the groove bottom of the mounting groove two (48) is open, the base (30) is provided with two opposite movable sealing plates (43) on the upper side, rubber pads are embedded on the opposite sides of the two sealing plates (43), a plurality of air inlet holes (45) are arranged at the center of the two sealing plates (43), an air pressure sensor is embedded on the sealing plate (43), and the air pressure sensor is signal connected with a processor.

7. A pre-installed leak tightness testing apparatus for self-tightening flanges according to claim 6, characterized in that: A plurality of positioning blocks (34) are arranged in the mounting groove one (47) and the mounting groove two (48) and can move in the radial direction, the inner wall of the mounting groove one (47) and the mounting groove two (48) is provided with a positioning groove (35) corresponding to the positioning block (34), the positioning block (34) is matched with the positioning groove (35), and the positioning block (34) slides in the positioning groove (35).

8. A pre-installed leak tightness testing apparatus for self-tightening flanges according to claim 7, characterized in that: The base (30) is provided with a sliding groove (37) corresponding to two sliding plates (31), the sliding plates (31) slide in the sliding groove (37), the opposite sides of the two sliding plates (31) are provided with a hydraulic telescopic cylinder two (38), the fixed end of the hydraulic telescopic cylinder two (38) is fixedly connected to the base (30), the output end of the hydraulic telescopic cylinder two (38) is fixedly connected to the sliding plate (31), the two ends of the mounting seat one (32) and the mounting seat two (33) on the upper side along the width direction of the sliding plate (31) are hingedly connected with a hydraulic telescopic cylinder three (39), the fixed end of the hydraulic telescopic cylinder three (39) is hingedly connected with the sliding plate (31), the upper side of the base (30) is fixedly connected with a connecting plate (40), the upper side of the connecting plate (40) is provided with a hydraulic telescopic cylinder four (41) on the side of the base (30), the fixed end of the hydraulic telescopic cylinder four (41) is fixedly connected to the connecting plate (40), the output end of the hydraulic telescopic cylinder four (41) is fixedly connected with a supporting plate (42), the four corners of the opposite sides of the two sealing plates (43) are provided with a hydraulic telescopic cylinder five (44), the fixed end of the hydraulic telescopic cylinder five (44) is fixedly connected to the supporting plate (42), the output end of the hydraulic telescopic cylinder five (44) is fixedly connected with the sealing plate (43), the opposite sides of the two sealing plates (43) are sealingly provided with a gas cover (46) corresponding to the air holes (45), the gas cover (46) is in communication with an air compressor through a pipeline, and a control valve is mounted on the pipeline communicating with the gas cover (46).

9. A detection method of a pre-installation air tightness detection device of a self-tightening flange, suitable for the pre-installation air tightness detection device of a self-tightening flange according to any one of claims 6-8, comprising the following steps, characterized in that: S1: installing the male flange (1) and the female flange (2) in the installation groove one (47) and the installation groove two (48) respectively, and clamping and fixing the male flange (1) and the female flange (2) and then installing them together; S2: sealing and pressing the two end faces of the flange after installation together by the sealing plates (43) respectively; S3: pumping gas into the flange cavity, detecting the gas pressure in the flange cavity by the gas pressure sensor, detecting the change of the gas pressure when the gas pressure reaches the detection standard, setting the alarm value of the change of the gas pressure by the processor, denoted as A, and the actual change of the gas pressure, denoted as A1, when A1 ​ ​ ​

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