Airtightness detection system applied to pipeline

Abstract

The invention discloses an airtightness detection system applied to a pipeline. The airtightness detection system comprises a detection table; the fixed detection unit and the movable detection unit are used for detecting the air tightness of a to-be-detected pipeline, a moving assembly is arranged on the detection table, the fixed detection unit is installed on the detection table, and the movable detection unit is fixed to the moving end of the moving assembly; the structure of the detection unit comprises a telescopic assembly; a detection assembly; the top end of the fixing table is provided with a clamping block for fixing the port of the to-be-detected pipeline; the plugging assembly is provided with a sealing silica gel plug tightly attached to the inner wall of the to-be-detected pipeline. According to the airtightness detection system applied to the pipeline, the problems that an existing pipeline sealing mechanism is multiple in structural limitation and low in practical performance, manual multiple interference debugging is needed if sealing between the sealing mechanism and parts is not in place, plugging cannot be completed in a short time, and the sealing efficiency is high are solved. Time and labor are wasted, the working efficiency is low, and the special-shaped pipeline cannot meet the detection and plugging requirements.

Description

Technical Field

[0001] The invention relates to the technical field of pipe fitting processing, in particular to an airtightness detection system applied to pipelines. Background Art

[0002] Before pipelines are manufactured and installed, as well as during use, they are usually subject to inspection and testing to check their quality and determine whether they can meet market demand for pipeline delivery. The sealing of both ends of the pipeline during the pressure test is very critical. If the sealing is not done properly, it will be impossible to detect whether there are quality problems with the pipeline, which may lead to major safety accidents.

[0003] In the existing pipeline sealing mechanism, such as application number: CN201310441131.9, a pipeline pressure test device and a method of use, the sealing is mainly achieved by a flexible cable to compress the pipeline radially and tightly against the sealing core. However, the sealing effect may be affected by many factors such as the tension of the cable, the roundness of the pipeline itself, and the uniformity of the material. The sealing reliability is relatively low. Moreover, when sealing with a flexible cable, for large-diameter pipelines, the cable needs to provide a greater tension to ensure sealing, and the actual application is limited.

[0004] Or another example is the application number: CN201310332608.X, a pipeline sealing connection mechanism, by arranging a connecting sleeve between a first pipeline and a second pipeline, the sealing between the connecting sleeve and the first pipeline, and the cooperation between the conical fitting surface between the conical sleeve and the No. 1 flange, so as to achieve the effect of leak-free sealing connection, but the connection mechanism includes multiple components, such as No. 1 flange, No. 2 flange, connecting sleeve, conical sleeve, No. 3 flange, No. 4 flange, No. 5 flange, limit clamping ring, etc., and also involves various matching structures, such as annular groove, annular clamping groove , tapered fitting surface, etc. Compared with ordinary connections, the overall structure is more complicated, and the tapered sleeve cooperates with the tapered fitting surface of the No. 1 flange, the No. 4 flange is clamped in the first annular groove of the connecting sleeve, and the limit clamping ring is embedded in the corresponding grooves of the connecting sleeve and the No. 5 flange. In actual operation, precise alignment and installation are required, which requires high skills of the operator, otherwise the sealing effect may be affected, and the combination of multiple components may also make the installation and disassembly process more cumbersome and time-consuming, especially when it is necessary to seal longer pipes or special-shaped pipes, there is a problem of low efficiency.

[0005] In summary, the existing pipeline sealing mechanism has many structural limitations and low practical performance. If the seal between the sealing mechanism and the components is not in place, multiple manual intervention and debugging are required, and the plugging cannot be completed in a short time. It is time-consuming and labor-intensive, has low work efficiency, and cannot meet the detection and plugging needs for special-shaped pipelines. Summary of the invention

[0006] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages which will be described hereinafter.

[0007] In order to achieve these purposes and other advantages of the present invention, an airtightness detection system for pipelines is provided, comprising: a detection platform; a fixed detection unit and a movable detection unit for detecting the airtightness of the pipeline to be detected, wherein a movable assembly is arranged on the detection platform, the fixed detection unit is mounted on the detection platform, and the movable detection unit is fixed on the movable end of the movable assembly;

[0008] The structure of the detection unit includes:

[0009] A telescopic assembly mounted on the detection platform or the moving assembly;

[0010] A detection component, the bottom end of which is connected to the output end of the telescopic component, and an L-shaped cavity is provided in the detection component, and the side of the L-shaped cavity is connected to the gas inlet or the airtightness detector;

[0011] A fixing platform, which is arranged above the telescopic assembly and has a clamping block at the top thereof for fixing the port of the pipeline to be inspected;

[0012] A plugging component is arranged through the fixing platform and has a ventilation pipe connected to the other end of the L-shaped cavity arranged therein. The plugging component is provided with a sealing silicone plug which is in close contact with the inner wall of the pipeline to be detected.

[0013] Preferably, the structure of the moving component comprises:

[0014] A slide rail fixed on the detection platform;

[0015] A slide table is slidably connected to the slide rail and the activity detection unit is fixedly mounted on the slide table.

[0016] Preferably, the structure of the telescopic assembly includes:

[0017] A cylinder housing having a cavity therein and mounted on the test bench or the moving assembly;

[0018] A cylinder piston rod, which is disposed in the cavity and has an output end connected to the detection assembly;

[0019] Interface 1, which is arranged on the upper half of the side of the cylinder housing and is connected with the cavity;

[0020] Interface 2, which is arranged on the lower half of the side of the cylinder housing and is connected with the cavity;

[0021] The fixed detection unit is communicated with the interface 1 or the interface 2 of the movable detection unit through an external three-way pipe.

[0022] Preferably, a T-shaped limit block is arranged on the central axis of the fixing platform, and bolt holes connected to the clamping block are arranged at both ends of the T-shaped limit block.

[0023] Preferably, the structure of the blocking component includes:

[0024] A lower sealing seat, which passes through the fixing platform and has a notch I at the upper end;

[0025] A hollow connecting slide bar, which is embedded in the interior of the lower sealing seat, and the ventilation duct is arranged in the hollow; an upper sealing cover, which is embedded in the top end of the hollow connecting slide bar, and a notch II is arranged at the lower end, and a predetermined gap exists between the upper sealing cover and the lower sealing seat;

[0026] The sealing silicone plug is arranged between the gap I and the gap II.

[0027] Preferably, the detection platform is provided with a plurality of sets of limit bases at predetermined positions, and a plurality of sets of T-shaped slide grooves are provided in parallel in the limit bases;

[0028] An elastic limit frame for limiting the position of a three-way pipe has double holes on it, and a gap is arranged on the center line of the elastic limit frame from the top to the double holes, ear structures are arranged on both sides of the elastic limit frame, a T-shaped slider is arranged at the bottom of the elastic limit frame, and the T-shaped slider is slidably connected with the T-shaped slide groove.

[0029] Preferably, a mounting plate is provided on the slide, and the structure of the mounting plate comprises:

[0030] A lower base, which is fixedly connected to the slide;

[0031] An upper base, the activity detection unit being fixedly mounted on the top of the upper base;

[0032] A plurality of guide posts arranged in a triangular shape and distributed between the upper base and the lower base;

[0033] The springs are respectively sleeved on the corresponding guide pillars.

[0034] Preferably, the structure of the clamping block includes:

[0035] A semi-arc-shaped housing I, wherein the axis thereof is provided with bolt holes penetrating therethrough;

[0036] A semi-arc inner shell I, whose outer wall is connected to the inner wall of the semi-arc outer shell I through a spring assembly;

[0037] A threaded adjustment rod, which passes through the bolt hole and contacts the outer wall of the semi-arc inner shell I;

[0038] A semi-arc shell II, which is arranged opposite to the semi-arc shell I;

[0039] The outer wall of the semi-arc inner shell II is connected to the inner wall of the semi-arc outer shell II through a plurality of groups of evenly distributed backtracking blocks;

[0040] The radius of the semi-arc inner shell I is smaller than that of the semi-arc inner shell II, and 8-20 protruding triangular blocks of predetermined sizes are arranged on the inner walls of the semi-arc inner shell I and the semi-arc inner shell II.

[0041] Preferably, a sealing interface is provided at the place where the side of the L-shaped cavity is connected to the gas inlet or the airtightness detector, the outer wall of the sealing interface extending into the L-shaped cavity is a toothed structure, the outer wall of the connection position between the sealing interface and the L-shaped cavity port is a trapezoidal structure, and a silicone sealing plug is provided on the outside of the trapezoidal structure.

[0042] A method for using an airtightness detection system for a pipeline comprises the following steps:

[0043] S1. Install and fix one end of the pipeline to be tested: align one end of the pipeline to be tested with the plugging assembly on the fixed detection unit, start the telescopic assembly to move vertically upward, so that the plugging assembly is sleeved in the port of the pipeline to be tested, and the outside of the pipeline to be tested is clamped and fixed by the clamping block on the fixed platform;

[0044] S2. Install and fix the other end of the pipeline to be inspected: first adjust the position of the active detection unit by moving the assembly so that it is in the same vertical plane as the other end of the pipeline to be inspected, and then continue the steps in S1 to complete the installation of the other end, thus completing the installation operation;

[0045] S3. Blocking the pipeline to be inspected: starting the telescopic assembly to move vertically downward so that the sealing silicone plug is squeezed and deformed to be in close contact with the inner wall of the pipeline to be inspected, thus completing the blocking operation;

[0046] S4. After the pipeline to be tested is sealed: the detection components on the fixed detection unit and the movable detection unit are respectively connected to the gas inlet or the airtightness detector, one end of which is used to introduce the detection gas into the pipeline to be tested, and the other end is connected to the airtightness detector to determine the qualified status of the product through the pressure difference or flow difference in the pipeline to be tested, thereby completing the test.

[0047] The present invention has at least the following beneficial effects:

[0048] The present invention has a simple structure. Through the cooperation between the telescopic component, the fixed platform, the detection component and the plugging component on the detection unit, one-second connection and instantaneous sealing can be achieved. In terms of production efficiency, the connection time can be greatly shortened, the overall detection efficiency is improved, and it can adapt to different special-shaped pipes.

[0049] The present invention is simple to operate, easy to use, and has wide practicality. The plugging and detection operations can be realized by connecting the pipeline to be detected with the plugging component, without referring to most of the existing complicated instructions, which greatly avoids accidents in which novices waste time and easily make operating errors after self-study. At the same time, it also reduces the labor intensity of operators, and in practice, when cooperated with a manipulator, semi-automatic or automatic assembly line operations can be realized.

[0050] The invention has low cost, is economical and durable, can be used repeatedly, and the detection unit has been used through actual testing and can achieve repeated compression for 100,000 times, is strong and wear-resistant, and greatly reduces the cost of use.

[0051] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a cross-sectional view of the overall structure of the present invention;

[0053] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0054] Figure 3 It is an enlarged cross-sectional view of a single detection unit of the present invention;

[0055] Figure 4 This is a schematic diagram of the simulated distribution after the elastic limit frame is installed and arranged on the test table of the present invention;

[0056] Figure 5 It is an enlarged schematic diagram of the structure of the mounting plate on the slide table of the present invention;

[0057] Figure 6 It is a schematic diagram of the enlarged structure of the clamping block of the present invention;

[0058] Figure 7 This is an enlarged view of the cross-sectional structure of the sealing interface. DETAILED DESCRIPTION

[0059] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0060] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0061] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the term is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0062] In the description of the present invention, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In addition, in the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0064] Figure 1-7 The present invention shows an air tightness detection system applied to a pipeline, comprising: a detection platform 3; a fixed detection unit 20 and a movable detection unit 21 for detecting the air tightness of the pipeline 1 to be detected, wherein a movable component 30 is arranged on the detection platform 3, the fixed detection unit 20 is installed on the detection platform 3, and the movable detection unit 21 is fixed on the movable end of the movable component 30;

[0065] The structure of the detection unit includes:

[0066] A telescopic assembly 4, which is mounted on the detection platform 3 or the moving assembly 30;

[0067] A detection component 5, the bottom end of which is connected to the output end of the telescopic component 4, and an L-shaped cavity 50 is provided in the detection component 5, and the side of the L-shaped cavity 50 is connected to the gas inlet or the airtightness detector;

[0068] A fixing platform 6, which is arranged above the telescopic assembly 4, and a clamping block 61 is arranged on the top of the fixing platform 6 for fixing the port of the pipeline 1 to be inspected;

[0069] The plugging component 7 is arranged through the fixing platform 6 and has a ventilation pipe 71 which is connected with another port of the L-shaped cavity 50 . The plugging component 7 is provided with a sealing silicone plug 72 which is in close contact with the inner wall of the pipeline 1 to be detected.

[0070] Working principle:

[0071] S1. Install and fix one end of the pipeline 1 to be inspected: the operator aligns one end of the pipeline 1 to be inspected with the plugging assembly 7 on the fixed detection unit 20, and starts the telescopic assembly 4 to move vertically upward through the external device, so that the plugging assembly 7 is sleeved in the port of the pipeline 1 to be inspected, and the clamping block 61 on the fixed platform 6 clamps and fixes the outside of the pipeline 1 to be inspected, so that the pipeline 1 to be inspected will not be displaced in subsequent steps;

[0072] S2. Install and fix the other end of the pipeline 1 to be inspected: the operator first starts the moving assembly 30 through the external device to adjust the position of the active detection unit 21 so that it is in the same vertical plane as the other end of the pipeline 1 to be inspected (and adapts to the width of pipelines of different sizes or special shapes), and then continues the steps in S1 to complete the installation of the other end and complete the installation operation;

[0073] S3, plugging the pipeline 1 to be inspected: the telescopic component 4 is started again by an external device to move vertically downward so that the sealing silicone plug 72 in the plugging component 7, which was originally in a normal state, is subjected to a downward external force, and is squeezed and deformed to be in a completely close and sealed state with the inner wall of the pipeline 1 to be inspected, thereby completing the plugging operation;

[0074] S4, after the pipeline 1 to be inspected is blocked: the operator connects the external gas inlet or airtightness detector to the inspection components 5 on the fixed inspection unit 20 and the movable inspection unit 21 respectively, and then introduces the inspection gas into one end of the L-shaped cavity 50, and then leaves from the other end of the L-shaped cavity 50 through the ventilation pipe 71 and finally enters the interior of the pipeline 1 to be inspected, and ventilation begins in the pipeline 1 to be inspected, and the introduced inspection gas leaves from another port of the pipeline 1 to be inspected and enters the L-shaped cavity 50 through the ventilation pipe 71, and finally reaches the external airtightness detector, and the airtightness detector determines the qualified state of the product through the pressure difference or flow difference in the pipeline 1 to be inspected, and the inspection is completed;

[0075] Among them, ① the fixed detection unit 20 and the movable detection unit 21 are used together because: the other end of the pipeline 1 to be detected also needs to be sealed and vented to form a stable pressure difference or a stable flow in the pipeline 1 to be detected, so that the detection result is accurate;

[0076] When there is leakage or seepage in the structure of the pipeline 1 to be tested, the pressure or flow of the external airtightness detector will change, and the product qualification will be determined based on the pressure difference or flow difference in the pipeline 1 to be tested;

[0077] ② The present invention has a simple structure. The detection unit can achieve one-second connection and instant sealing through the cooperation between the telescopic component 4, the fixing platform 6, the detection component 5, and the plugging component 7. In terms of production efficiency, the connection time can be greatly shortened, the overall detection efficiency can be improved, and it can adapt to different special-shaped pipeline detection and plugging operations;

[0078] The present invention is simple to operate, easy to use, widely practical and low in cost. The plugging and detection operations can be achieved by connecting the pipeline 1 to be detected with the detection unit 2.

[0079] ③ The airtightness detection equipment is an existing technology or a commercially available product, and this article will not elaborate on its specific structure.

[0080] As in the above solution, the structure of the moving component 30 includes:

[0081] A slide rail 301, which is fixed on the detection platform 3;

[0082] The slide table 302 is slidably connected to the slide rail 301 and the activity detection unit 21 is fixedly mounted thereon.

[0083] Working principle:

[0084] Before the device is operated, the fixed detection unit 20 is directly installed on the detection platform 3, and the movable detection unit 21 is installed on the moving component 30. In actual use, the slide rail 301 can drive the slide platform 302 to move within a certain range, thereby driving the movable detection unit 21 to move. This setting method can realize the port connection of the pipeline 1 to be detected of different types, different sizes, different sizes and different widths without causing the pipeline 1 to be detected to be deformed, thereby enhancing practicality;

[0085] The connection between the moving component 30 and the activity detection unit 21 is a fixed connection (such as bolt, riveting or pin connection, etc.);

[0086] In actual use, in order to ensure that the slide 302 no longer drives the active detection unit 21 to move after reaching the specified position, an additional locking nut can be used after the slide 302 reaches the predetermined position. It is tightened on the screw rod and rests on the nut seat of the slide 302. By increasing the friction force, relative rotation between the nut and the screw rod is prevented, thereby preventing the slide from continuing to slide.

[0087] As in the above solution, the structure of the telescopic assembly 4 includes:

[0088] A cylinder housing 40, which has a cavity 41 therein and is mounted on the detection table 2 or the moving assembly 30;

[0089] A cylinder piston rod 42, which is disposed in the cavity 41 and has an output end connected to the detection assembly 5;

[0090] Interface 1 43, which is disposed on the upper half of the side of the cylinder housing 40 and is connected to the cavity 41;

[0091] The second interface 44 is provided at the lower half of the side of the cylinder housing 40 and is communicated with the cavity 41;

[0092] The fixed detection unit 20 is connected to the interface 1 43 or the interface 2 44 of the movable detection unit 21 through an external three-way pipe 8 .

[0093] Working principle:

[0094] The initial state of the telescopic assembly 4 is: the cylinder piston rod 42 is at the bottom of the cavity 41 in the cylinder housing 40, the operator aligns one end of the pipeline 1 to be detected with the plugging assembly 7 on the detection unit, ventilates the cavity 41 through the second interface 44, and the interface 1 43 discharges the gas in the cavity 41. At this time, the cylinder piston rod 42 moves vertically upward under the action of the pressure difference, so that the plugging assembly 7 is sleeved in the port of the pipeline 1 to be detected;

[0095] After the pipeline 1 to be inspected is fixed, air is ventilated into the cavity 41 through the first interface 43, and the cavity 41 is exhausted through the second interface 44. At this time, the cylinder piston rod 42 moves vertically downward under the action of the pressure difference, and the plugging component 7 is compressed to achieve plugging, thereby achieving a sealing operation on the port of the pipeline 15 to be inspected;

[0096] Among them, the telescopic component 4 is controlled by a three-way pipe 8 (a hose is preferably used in actual use) to achieve simultaneous expansion and release of the sealing silicone plugs of the telescopic component 4 on the fixed detection unit 20 and the movable detection unit 21. Because the pipeline 1 to be detected may undergo slight changes due to factors such as thermal expansion and contraction during operation, synchronous operation can maintain a good sealing state and avoid leakage.

[0097] As in the above solution, a T-shaped limit block 62 is arranged on the central axis of the fixing platform 6 , and bolt holes connected to the clamping block 61 are arranged at both ends of the T-shaped limit block 62 .

[0098] Working principle:

[0099] After the clamp block 61 fixes the pipeline 1 to be inspected, one side of the clamp block 61 is fixed to the bolt at one end of the T-shaped limit block 62 through the bolt hole, thereby further limiting and fixing the pipeline 1 to be inspected;

[0100] In actual use, the fixing method of the two can be changed according to the actual operation or device conditions (such as bolts, rivets or pin connections, etc.). The design of the T-shaped limit block 62 can ① provide a good positioning function to ensure that the two clamping blocks 6 can be accurately aligned during installation, avoiding unstable clamping caused by installation deviation, which may cause failure of the test result;

[0101] ② The T-shaped limit block 62 itself can bear a certain load, and together with the bolt, can disperse the force at the connection of the clamping block 6, thereby improving the strength and bearing capacity of the entire clamping structure.

[0102] As in the above solution, the structure of the blocking component 7 includes:

[0103] A lower sealing seat 73, which penetrates the fixing platform 6 and has a notch Ⅰ 730 at the upper end;

[0104] A hollow connecting slide rod 74 is embedded in the lower sealing seat 73, and the ventilation duct 71 is arranged in the hollow part;

[0105] An upper sealing cover 75 is embedded in the top end of the hollow connecting slide rod 74 and has a notch II 750 at the lower end. There is a predetermined gap between the upper sealing cover 75 and the lower sealing seat 73.

[0106] The sealing silicone plug 72 is disposed between the notch I 730 and the notch II 750 .

[0107] Working principle: The sealing silicone plug 72 is in the initial state and is arranged between the notch I 730 and the notch II 750. The telescopic assembly 4 is started to move vertically upward, so that the hollow connecting slide bar 74 moves vertically along the inner wall of the lower sealing seat 73 and moves vertically upward with the upper sealing cover 75. At this time, a certain gap is formed between the upper sealing cover 75 and the lower sealing seat 73.

[0108] After the pipeline 1 to be inspected is connected and fixed, the telescopic assembly 4 moves vertically downward, so that the hollow connecting slide rod 74 moves vertically along the inner wall of the lower sealing seat 73, and moves vertically downward with the upper sealing cover 75, and the sealing silicone plug 72 is compressed laterally by the downward squeezing force from the upper sealing cover 75, so as to achieve the blocking of the pipeline 1 to be inspected;

[0109] After the pipeline 1 to be tested is plugged and sealed: the test gas is introduced into the ventilation pipeline 71 through the L-shaped cavity 50, and the test gas enters the pipeline 1 to be tested through the hollow connecting slide rod 74, and the qualified status of the product is determined by the external airtightness testing equipment;

[0110] Among them, ① before the device is used, since the lower sealing seat 73 is fixed on the fixed platform 6, it will not move with the hollow connecting slide bar 74 or the upper sealing cover 75, which further limits the movable space and trajectory of the telescopic component 4 and the hollow connecting slide bar 74, reduces the risk of failure or damage caused by excessive movement of the components during movement, and can improve the working accuracy and reliability of the entire device;

[0111] ② In order to prevent the hollow connecting slide rod 74 from accidentally hitting the lower sealing seat 73 during movement, a buffer material (such as sponge or rubber pad, etc.) can be added to reduce wear and increase service life;

[0112] ③ The place where the lower sealing seat 73 is connected to the fixed platform 6 is an interference connection, and the place where the upper sealing cover 75 is connected to the hollow connecting slide rod 74 is an interference connection. The reason for preferring interference connection is:

[0113] The lower sealing seat 73 and the fixed platform 6, the upper sealing cover 75 and the hollow connecting slide rod 74 form a tight fit, effectively preventing possible leakage during gas detection, which may lead to deviations in the detection results. Compared with other traditional connection methods, the assembly process of the interference connection is relatively simple, does not require additional fasteners, and does not require complicated welding operations, reducing assembly time and cost.

[0114] As in the above solution, the detection platform 3 is provided with multiple sets of limit bases 31 at predetermined positions, and multiple sets of T-shaped slide grooves 310 are arranged in parallel in the limit bases 31;

[0115] An elastic limit frame 32 is provided to limit the position of the three-way pipe 8, and a gap 320 is provided on the midline of the elastic limit frame 32, which runs from the top to the double holes. Ear-shaped structures are provided on both sides of the elastic limit frame 32. A T-shaped slider is provided at the bottom of the elastic limit frame 32, and the T-shaped slider is slidably connected to the T-shaped slide groove 310.

[0116] Working principle:

[0117] When the operator needs to install the three-way pipe 8, first slide the elastic limit frame 32 along the T-shaped slide groove 310 in the limit base 31 (fixed with the detection table 3, bolts or buckles can be selected according to the actual use situation) to a suitable position through the T-shaped slider at the bottom, and then open the elastic limit frame 32 to both sides from the gap 320 set at the midline position through the ear-shaped structure, and align the branch part of the three-way pipe 8 with the double holes of the elastic limit frame 32, and then use the elastic restoring force of the elastic limit frame 32 itself (the elastic material can be selected such as thermoplastic elastomer, rubber, silicone, etc.) to close the gap 320 so that it can fit the three-way pipe 8 tightly, thereby positioning and limiting the three-way pipe 8, ensuring that the three-way pipe 8 is in a predetermined position on the detection table 3, so as to facilitate the smooth progress of subsequent work;

[0118] Among them, the limiting base 31 at the predetermined position can be set one near the fixed detection unit 20 according to the actual situation, and multiple groups can be set relative to the position of the moving component 30, so that the elastic limiting frame 32 can flexibly follow the moving trajectory of the active detection unit 21 to change its position;

[0119] This design enables accurate auxiliary positioning of multiple positions of the three-way pipe 8 to be achieved during the entire operation process, greatly improving work efficiency and accuracy, ensuring that the three-way pipes 8 at different positions are in the best position and avoiding entanglement between pipes.

[0120] As in the above solution, a mounting plate 3020 is provided on the slide 302, and the structure of the mounting plate 3020 includes:

[0121] A lower base 3021, which is fixedly connected to the slide 302;

[0122] An upper base 3022, the activity detection unit 21 is fixedly mounted on the top of the upper base;

[0123] A plurality of guide posts 3023 arranged in a triangular shape and distributed between the upper base 3021 and the lower base 3022;

[0124] The springs 3024 are respectively sleeved on the corresponding guide posts 3023 .

[0125] Working principle:

[0126] A mounting plate 3020 is added to the slide 302 to avoid possible errors in actual use. The guide posts 3023 are arranged between the upper base 3022 and the lower base 3021 and are arranged in a triangular shape. The triangular layout has high stability and can provide precise guidance for the movement of the upper base 3022, ensuring that the upper base 3022 will not deviate or shake during the movement and always moves smoothly in the predetermined direction.

[0127] Among them, ① the spring 3024 is sleeved on the guide column 3023 to play the role of buffering and shock absorption. When the slide 302 is started, stopped or affected by external vibration during the movement, the spring 3024 can absorb and buffer these impact forces;

[0128] ② In actual use, when the moving assembly 30 accelerates or stops, the spring 3024 can reduce the inertia of the upper base 3022 and the activity detection unit 21 by compressing or stretching itself;

[0129] ③ When the detection component 5 is in use, the active detection unit 21 is subjected to external force due to vacuum or inhalation. The spring 3024 can offset part of the vibration energy through elastic deformation, avoid displacement, ensure the stability of the active detection unit 21, and improve the accuracy during operation.

[0130] As in the above solution, the structure of the clamp block 61 includes:

[0131] A semi-arc-shaped housing I 611, wherein a bolt hole 612 is provided through the axis thereof;

[0132] The outer wall of the semi-arc inner shell Ⅰ 613 is connected to the inner wall of the semi-arc outer shell Ⅰ 611 through a spring assembly 614;

[0133] A threaded adjustment rod 615, which passes through the bolt hole 612 and contacts the outer wall of the semi-arc inner shell I 611;

[0134] A semi-arc-shaped housing II 616, which is arranged opposite to the semi-arc-shaped housing I 611;

[0135] The outer wall of the semi-arc inner shell II 617 is connected to the inner wall of the semi-arc outer shell II 616 through a plurality of groups of evenly distributed backtracking blocks 618;

[0136] The radius of the semi-arc inner shell I 613 is smaller than that of the semi-arc inner shell II 617 , and 8-20 protruding triangular blocks of predetermined sizes are arranged on the inner walls of the semi-arc inner shell I 613 and the semi-arc inner shell II 617 .

[0137] Working principle:

[0138] The semi-arc shell I 611 and the semi-arc shell II 616 on the clamp block 61 are arranged opposite to each other, and the combination of the two can form an approximately circular space, which can clamp and fix the pipeline 1 to be detected, specifically:

[0139] After the operator places the pipeline 1 to be inspected on the inspection unit, the operator rotates the threaded adjustment rod 615 to slide along the thread of the bolt hole 612, thereby driving the semi-arc inner shell I 613 to move laterally, so that the semi-arc inner shell I 613 approaches the pipeline 1 to be inspected;

[0140] When the outer wall of the pipeline 1 to be inspected is completely fitted with the semi-arc inner shell I 613 and the semi-arc inner shell II 617, the threaded adjustment rod 615 is continuously rotated so that the pipeline 1 to be inspected continues to be subjected to lateral force, because the radius of the semi-arc inner shell I 613 is smaller than the radius of the semi-arc inner shell II 617, so that the semi-arc inner shell II 617 can move laterally, and the backtracking block 618 (in actual use, the backtracking block can be made of a relatively hard material with a certain backtracking ability, such as beryllium bronze, ceramic-based composite materials, etc.) between it and the semi-arc outer shell II 616 is squeezed and deformed by external force and stops rotating. At this time, the pipeline 1 to be inspected will be subjected to the rebound force of the backtracking block 618 to improve the stability of clamping and avoid displacement during the inspection operation;

[0141] Among them, the spring group 614 and the backtracking block 618 not only play a role in adjusting the clamping force, but also have a buffering function; in actual use, 8-20 (size between 0.5mm-1.5mm) protruding blocks with a triangular structure (or irregular and with multiple contact points) can be added to the inner walls of the semi-arc inner shell I 613 and the semi-arc inner shell II 617, so that the surface contact with the pipeline 1 to be detected is changed to multi-point contact, thereby further increasing the clamping force.

[0142] As in the above scheme, a sealing interface 51 is provided at the place where the side of the L-shaped cavity 50 is connected to the gas inlet or the airtightness detector, and the outer wall of the sealing interface 51 extending into the L-shaped cavity 50 is a toothed structure 510, and the outer wall of the connection position between the sealing interface 51 and the port of the L-shaped cavity 50 is a trapezoidal structure 511, and a silicone sealing plug is provided on the outside of the trapezoidal structure 511.

[0143] Working principle:

[0144] The connection between the upper part of the outer wall of the sealing interface 51 and the L-shaped cavity 50 is designed as a tooth-shaped structure 510. When the sealing interface 51 is inserted into the L-shaped cavity 50, the protruding part of the tooth-shaped structure 510 is in close contact with the inner wall of the L-shaped cavity 50. The increased contact area increases the friction force, thereby preventing the sealing interface 51 from falling off easily during use.

[0145] The lower part of the sealing plug is designed as a trapezoidal structure 511. As the sealing interface 51 goes deeper, the inclined surface of the trapezoidal structure 511 gradually contacts the end of the L-shaped cavity and produces an extrusion effect. This extrusion causes the sealing interface 51 to expand in the radial direction to a certain extent, further filling the gap between the sealing interface 51 and the L-shaped cavity 50. The silicone sealing plug arranged on the outside can further enhance the sealing effect and effectively prevent gas leakage.

[0146] Among them, ① in actual use, at the same time, the tooth structure 510 has a certain elastic deformation ability. When the sealing interface 51 is inserted, the teeth can be appropriately deformed and adjusted according to the actual shape of the inner wall, and fit closely on the inner wall, further enhancing the reliability of the seal, ensuring that a good sealing effect can be achieved under various actual working conditions;

[0147] ② In actual use, the port of the L-shaped cavity 50 may have certain processing errors or slight deformations. During the insertion process, the trapezoidal structure 511 can adapt to the size changes of the port to a certain extent due to the existence of its inclined surface, thereby improving the success rate and adaptability of the installation;

[0148] ③ The characteristic of the trapezoidal structure 511 being narrow at the top and wide at the bottom makes it difficult for the sealing interface 51 to fall out of the port after being inserted into the port of the L-shaped cavity 50, thereby ensuring the stability and durability of the sealing structure and reducing the risk of leakage caused by the sealing plug falling off.

[0149] A method for using an airtightness detection system for a pipeline comprises the following steps:

[0150] S1. Install and fix one end of the pipeline 1 to be detected: align one end of the pipeline 1 to be detected with the plugging assembly 7 on the fixed detection unit 20, start the telescopic assembly 4 to move vertically upward, so that the plugging assembly 7 is sleeved in the port of the pipeline 1 to be detected, and the outside of the pipeline 1 to be detected is clamped and fixed by the clamping block 61 on the fixing platform 6;

[0151] S2. Install and fix the other end of the pipeline 1 to be inspected: first adjust the position of the movable detection unit 21 by the moving assembly 30 so that it is in the same vertical plane as the other end of the pipeline 1 to be inspected, and then continue the steps in S1 to complete the installation of the other end, thus completing the installation operation;

[0152] S3, plugging the pipeline 1 to be inspected: starting the telescopic assembly 4 to move vertically downward so that the sealing silicone plug 72 is squeezed and deformed to be in close contact with the inner wall of the pipeline 1 to be inspected, thus completing the plugging operation;

[0153] S4. After the pipeline 1 to be inspected is sealed: the detection components 5 on the fixed detection unit 20 and the movable detection unit 21 are respectively connected to the gas inlet or the airtightness detector, one end of which is used to introduce the detection gas into the pipeline 1 to be inspected, and the other end is connected to the airtightness detector and the qualified status of the product is determined by the pressure difference or flow difference in the pipeline 1 to be inspected, thereby completing the inspection.

[0154] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An airtightness detection system for a pipeline, comprising: Testing bench; A fixed detection unit and a movable detection unit for detecting the air tightness of the pipeline to be detected, characterized in that a mobile component is provided on the detection table, the fixed detection unit is installed on the detection table, and the movable detection unit is fixed on the mobile end of the mobile component; The structure of the detection unit includes: A telescopic assembly mounted on the detection platform or the moving assembly; A detection component, the bottom end of which is connected to the output end of the telescopic component, and an L-shaped cavity is provided in the detection component, and the side of the L-shaped cavity is connected to the gas inlet or the airtightness detector; A fixing platform, which is arranged above the telescopic assembly and has a clamping block at the top thereof for fixing the port of the pipeline to be inspected; A plugging component is arranged through the fixing platform and has a ventilation pipe connected to the other end of the L-shaped cavity arranged therein. The plugging component is provided with a sealing silicone plug which is in close contact with the inner wall of the pipeline to be detected.

2. The airtightness detection system for pipelines according to claim 1, characterized in that: The structure of the mobile component includes: A slide rail fixed on the detection platform; A slide table is slidably connected to the slide rail and the activity detection unit is fixedly mounted on the slide table.

3. The airtightness detection system for pipelines according to claim 1, characterized in that: The structure of the telescopic assembly includes: A cylinder housing having a cavity therein and mounted on the test bench or the moving assembly; A cylinder piston rod, which is disposed in the cavity and has an output end connected to the detection assembly; Interface 1, which is arranged on the upper half of the side of the cylinder housing and is connected with the cavity; Interface 2, which is arranged on the lower half of the side of the cylinder housing and is connected with the cavity; The fixed detection unit is communicated with the interface 1 or the interface 2 of the movable detection unit through an external three-way pipe.

4. The airtightness detection system for pipelines according to claim 1, characterized in that: A T-shaped limit block is arranged on the central axis of the fixing platform, and bolt holes connected with the clamping blocks are arranged at both ends of the T-shaped limit block.

5. The airtightness detection system for pipelines according to claim 1, characterized in that: The structure of the blocking component includes: A lower sealing seat, which passes through the fixing platform and has a notch I at the upper end; A hollow connecting slide rod is embedded in the lower sealing seat, and the ventilation duct is arranged in the hollow part; An upper sealing cover is embedded in the top end of the hollow connecting slide rod and has a notch II at the lower end, so that a predetermined gap exists between the upper sealing cover and the lower sealing seat; The sealing silicone plug is arranged between the gap I and the gap II.

6. An airtightness detection system for pipelines according to claim 1 or 3, characterized in that: The detection platform is provided with multiple sets of limit bases at predetermined positions, and multiple sets of T-shaped slide grooves are arranged in parallel on the limit bases; An elastic limit frame for limiting the position of a three-way pipe has double holes on it, and a gap is arranged on the center line of the elastic limit frame from the top to the double holes, ear structures are arranged on both sides of the elastic limit frame, a T-shaped slider is arranged at the bottom of the elastic limit frame, and the T-shaped slider is slidably connected with the T-shaped slide groove.

7. The airtightness detection system for pipelines according to claim 2, characterized in that: The slide is provided with a mounting plate, and the structure of the mounting plate comprises: A lower base, which is fixedly connected to the slide; An upper base, the activity detection unit being fixedly mounted on the top of the upper base; A plurality of guide posts arranged in a triangular shape and distributed between the upper base and the lower base; The springs are respectively sleeved on the corresponding guide pillars.

8. The airtightness detection system for pipelines according to claim 1, characterized in that: The structure of the clamping block comprises: A semi-arc-shaped housing I, wherein the axis thereof is provided with bolt holes penetrating therethrough; A semi-arc inner shell I, whose outer wall is connected to the inner wall of the semi-arc outer shell I through a spring assembly; A threaded adjustment rod, which passes through the bolt hole and contacts the outer wall of the semi-arc inner shell I; A semi-arc shell II, which is arranged opposite to the semi-arc shell I; The outer wall of the semi-arc inner shell II is connected to the inner wall of the semi-arc outer shell II through a plurality of groups of evenly distributed backtracking blocks; The radius of the semi-arc inner shell I is smaller than that of the semi-arc inner shell II, and 8-20 protruding triangular blocks of predetermined sizes are arranged on the inner walls of the semi-arc inner shell I and the semi-arc inner shell II.

9. The airtightness detection system for pipelines according to claim 1, characterized in that: A sealing interface is provided at the place where the side of the L-shaped cavity is connected to the gas inlet or the airtightness detector. The outer wall of the sealing interface that extends into the L-shaped cavity is a toothed structure. The outer wall of the connection position between the sealing interface and the L-shaped cavity port is a trapezoidal structure, and a silicone sealing plug is provided on the outside of the trapezoidal structure.

10. A method of using the device according to claim 1, characterized in that: The following steps are involved: S1. Install and fix one end of the pipeline to be tested: align one end of the pipeline to be tested with the plugging assembly on the fixed detection unit, start the telescopic assembly to move vertically upward, so that the plugging assembly is sleeved in the port of the pipeline to be tested, and the outside of the pipeline to be tested is clamped and fixed by the clamping block on the fixed platform; S2. Install and fix the other end of the pipeline to be inspected: first adjust the position of the active detection unit by moving the assembly so that it is in the same vertical plane as the other end of the pipeline to be inspected, and then continue the steps in S1 to complete the installation of the other end, thus completing the installation operation; S3. Blocking the pipeline to be inspected: starting the telescopic assembly to move vertically downward so that the sealing silicone plug is squeezed and deformed to be in close contact with the inner wall of the pipeline to be inspected, thus completing the blocking operation; S4. After the pipeline to be tested is sealed: the detection components on the fixed detection unit and the movable detection unit are respectively connected to the gas inlet or the airtightness detector, one end of which is used to introduce the detection gas into the pipeline to be tested, and the other end is connected to the airtightness detector to determine the qualified status of the product through the pressure difference or flow difference in the pipeline to be tested, thereby completing the test.

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